B    3    fi!2    fl21 


SMITHSONIAN 


MISCELLANEOUS    COLLECTIONS. 


METEOROLOGICAL 


AND 


PHYSICAL      TABLES 


LIBRARY 

UNIVERSITY  O>-  CALIFORNIA 
DAViS 


THE  LIBRARY 

OF 

THE  UNIVERSITY 

OF  CALIFORNIA 

DAVIS 


Smithsonian  Jttisttllanams  (foliations. 


TABLES, 


METEOROLOGICAL    AND    PHYSICAL, 


PREPARED   FOR 


THE  SMITHSONIAN  INSTITUTION 


BY 


AENOLD    GUYOT,  P.  D.,  LL.D., 

PROFESSOR  OP.GEOLOGT  AND  PHYSICAL  GEOGRAPHY,   COLLEGE   OF  NEW  JERSEY. 


SECOND      EDITION, 
REVISED      AND      ENLARGED. 


WASHINGTON: 
SMITHSONIAN    INSTITUTION, 

1858. 


LIBRARY 

UNIVERSITY  OF  CALIFORM* 
DAVIS 


CAMBRIDGE: 

METCALF  AND  COMPANY,  ELECTROTYPEKS  AND  PRINTERS. 


PREFACE 

TO    THE    FIRST    EDITION 


To     PROF.    JOSEPH    HENRY, 

Secretary  of  the  Smithsonian  Institution. 

SIR,— 

IN  compliance  with  your  instructions,  I  have  prepared  the  collection  of 
Meteorological  Tables  contained  in  the  following  pages.  I  have  en- 
deavored to  render  it  useful,  not  only  to  the  observers  engaged  in  the  sys- 
tem of  Meteorological  Observations  now  in  operation  under  the  direction 
of  the  Smithsonian  Institution,  for  whom  it  was  immediately  designed,  but 
also  to  any  Meteorologist  who  may  desire  to  compare  and  to  work  out 
portions  of  the  vast  amount  of  Meteorological  Observations  already  ac- 
cumulated in  the  stores  of  science. 

The  reduction  of  the  observations  and  the  extensive  comparisons,  with- 
out which  Meteorology  can  do  but  little,  require  an  amount  of  mechanical 
labor  which  renders  it  impossible  for  most  observers  to  deduce  for  them- 
selves the  results  of  their  own  observations.  The  difficulty  is  still  further 
increased  by  the  diversity  of  the  thermometrical  and  barometrical  scales 
which  Meteorologists,  faithful  to  old  habits  rather  than  to  science  and  to 
reason,  choose  to  retain,  notwithstanding  the  additional  labor  they  thus 
gratuitously  assume  to  themselves.  To  relieve  the  Meteorologist  of  a 
great  portion  of  this  labor,  by  means  of  tables  sufficiently  extensive  to 
render  calculations  and  even  interpolations  unnecessary,  is  to  save  his 
time  and  his  forces  in  favor  of  science  itself,  and  thus  materially  contribute 
to  its  advancement.  But  most  of  the  tables  useful  in  Meteorology  being 
scattered  through  many  volumes,  which  are  often  not  of  easy  access,  this 
collection  will  be,  it  is  hoped,  acceptable  to  the  friends  of  Meteorology, 
and  will  supply  a  want  very  much  felt  in  this  department  of  the  physical 
sciences. 


4  PREFACE   TO   THE   FIRST   EDITION. 

In  the  selection  of  the  matter,  I  have  been  guided  by  the  idea  that  the 
tables  which  I  sought  for  my  own  use  might  also  be  those  most  likely  to 
be  wanted  by  others.  But  I  wish  the  following  to  be  considered  as  a 
first  collection,  containing  only  the  tables  most  appropriate  to  the  present 
purpose.  They  are,  therefore,  arranged  in  different  and  independent  series, 
with  distinct  paging,  but  constituting  together  a  frame-work  into  which 
any  tables  may  be  readily  inserted  when  wanted,  either  to  make  the  collec- 
tion more  complete,  pr  to  present  a  choice  of  tables  calculated  from  some- 
what different  elements,  or  adapted  to  various  methods  of  calculation. 

The  measurement  of  heights  by  means  of  the  barometer  being  inti- 
mately connected  with  Meteorology,  it  was  thought  not  inappropriate  to 
admit  into  this  collection  Hypsometrical  Tables,  destined  to  render  this  kind 
of  calculations  more  easy  and  more  rapid,  and  thus  to  increase  the  taste  for 
a  method  so  useful  in  physical  geography.  I  have  preferred  the  tables  of 
Delcros,  as  uniting  in  the  greatest  degree  simplicity  and  accuracy.  Those 
of  Gauss,  Bessel,  and  Baily  may  be  given  afterwards. 

Every  table  contains  directions  for  its  use,  when  necessary ;  moreover, 
the  indication  of  the  elements  used  in  its  calculation,  and  of  the  source 
from  which  it  has  been  taken.  When  no  remark  is  made  as  to  this  last 
point,  the  table  has  been  expressly  calculated  for  this  volume. 

% 

Very  respectfully, 

Your  obedient  servant, 

A.  GUYOT. 
CAMBRIDGE,  MASS.,  December  15th)  1851. 


PREFACE 

i 

TO    THE     SECOND     EDITION 


To     PROF.     JOSEPH    HENRY, 

Secretary  of  the  Smithsonian  Institution. 

SIR,— 

IN  sending  to  you  the  Meteorological  Tables  composing  the  first  edition  of 
this  volume,  published  in  1852, 1  expressed  the  desire  that  they  be  consid- 
ered as  a  first  collection,  containing  the  tables  most  needed  at  the  time  by 
the  meteorological  observers  engaged  in  the  system  carried  on  under  the 
supervision  of  the  Smithsonian  Institution,  but  destined  to  be  increased. 
It  was  in  that  expectation,  I  remarked,  that  the  tables  had  been  arranged  in 
independent  series,  as  a  kind  of  framework,  into  which  a  larger  number 
could  readily  be  inserted.  It  seemed,  indeed,  highly  desirable  to  offer  to 
the  Meteorologist  and  Physical  Geographer,  not  only  the  tables  they  daily 
need  for  working  out  the  results  of  their  observations,  but  also  such  a  vari- 
ety of  tables,  computed  from  different  elements,  or  by  different  methods,  or 
adapted  to  different  measures,  as  to  enable  every  one  to  choose  among  them 
those  that  he  most  approves,  and  at  the  same  time  properly  to  compare  and 
to  appreciate  the  results  obtained  by  others. 

Thanks  to  the  congenial  spirit  with  which  the  elevated  views  of  the  foun- 
der of  the  Smithsonian  Institution  are  carried  out,  that  character  of  general 
usefulness  is  not  wanting  in  the  present  volume.  With  your  agreement,  the 
present  edition  contains  more  than  three  times  as  much  matter  as  the  first ; 
and  a  rapid  indication  of  the  additions  will  suffice  to  justify  them,  and  to 
show  that,  in  selecting  or  calculating  the  new  tables,  the  object  just  men- 
tioned was  constantly  kept  in  view 

As  to  the  tables  in  the  first  edition,  I  must  remark  that,  several  of  them 
having  been  printed  in  my  absence,  the  copy  prepared  for  the  printer,  in 
which  decimals  had  to  be  left  out,  failed  to  give  always  the  nearest  value. 
Though  these  errors  are  too  small  to  have  any  importance  whatsoever  in 
Meteorology,  a  careful  revision  of  all  the  tables  on  the  original  computations 
was  made,  and  they  were  corrected  in  the  present  edition  The  few  actual 
misprints  which  were  discovered  are  indicated  in  a  table  of  errata  to  the 
first  edition. 


6  PREFACE   TO   THE   SECOND    EDITION. 

In  the  Thermometrical  series  six  small  tables  have  been  added ;  they  were 
prepared  for  converting  into  each  other  differential  results  given  in  degrees 
of  any  one  of  the  three  thermometrical  scales,  irrespective  of  their  zero 
point. 

The  Hygrometrical  series  has  been  entirely  reorganized.  It  only  con- 
tained five  tables,  all  in  French  measures,  and  the  Appendix.  It  is  now 
composed  of  twenty-seven,  arranged  in  three  divisions.  In.  the  first  are 
found  ten  tables,  based  on  Regnault's  hygrometrical  constants,  both  in 
French  and  in  English  measures,  in  two  corresponding  sets,  for  the  use  of 
the  psychrometer,  the  dew-point  instruments,  and  for  computing  the  weight 
of  vapor  in  the  air.  The  whole  set  in  English  measures,  and  Table  V.  in 
French  measures,  have  been  prepared  for  this  edition.  Being  based  on  the 
best  elements  we  now  possess,  they  are  given  here  for  ordinary  use.  The 
second  division  contains  the  seven  most  important  tables  published  in  the 
Greenwich  Observations,  and  Glaisher's  extensive  Psychrometrical  Table. 
These  tables  being  much  used  in  England,  and  the  results  obtained  by  them 
exhibiting  no  inconsiderable  differences  from  those  derived  from  the  pre- 
ceding ones,  they  are  indispensable  for  comparing  these  results.  The  third 
division,  composed  of  ten  miscellaneous  tables,  furnishes  the  means  of  com- 
paring the  different  values  of  the  force  and  the  weight  of  vapor,  especially 
those  which  have  frequently  been  used  in  Germany,  and  also  of  reducing 
the  indications  of  Saussure's  Hair-Hygrometer  to  the  ordinary  scale  of 
moisture.  The  Appendix  has  remained  as  in  the  first  edition,  but  all  the 
tables  have  been  revised  and  corrected. 

The  Barometrical  series,  now  in  four  divisions,  has  been  increased  from 
twelve  to  twenty-eight  tables.  Excepting  three  small  'tables  for  capillary 
action,  all  the  new  ones  have  been  computed  for  this  edition.  The  com- 
parison, now  so  much  needed,  of  the  Russian  barometer  with  the  other 
scales,  appears  here  for  the  first  time. 

The  Hypsometrical  series  is  almost  entirely  new.  It  contained  only  Del- 
cros's  table  for  barometric  and  Regnault's  table  for  thermometric  measure- 
ments, besides  two  auxiliary  tables  and  the  thirteen  small  tables  of  the 
Appendix.  It  now  offers  twenty-three  tables  for  barometrical  measurement 
of  heights,  in  which  all  the  principal  formulae  and  scales  are  represented ; 
three  for  the  measurement  of  heights  by  the  thermometer,  in  French  and  in 
English  measures ;  and  a  rich  Appendix  of  forty-four  tables,  more  extensive 
and  convenient  than  those  in  the  old  set,  which  afford  the  means  of  readily 
converting  into  each  other  all  the  measures  usually  employed  for  indicating 
altitudes. 

The  series  of  Meteorological  Corrections  for  periodic  and  non-periodic 
variations,,  for  all  parts  of  the  world,  mostly  due  to  the  untiring  industry  of 
Professor  Dove,  is  an  addition  which  will  surely  be  appreciated  by  those 
who  know  how  difficult  access  to  the  original  tables  is  for  most  Meteorol- 


PREFACE   TO    THE   SECOND   EDITION.  7 

ogists.  A  few  tables  have  been  added  to  Dove's  collection,  computed  by 
Glaisher,  Captain  Lefroy,  and  by  myself.  Most  of  the  tables  refer  to  tem- 
perature, only  two  to  moisture.  Two  tables  of  Barometrical  Corrections 
have  been  placed  in  the  Hypsometrical  series,  where  they  were  needed, 
until  they  can  be  joined  by  others  to  make  a  set  in  this  series,  which  still 
awaits  new  contributions,  especially  for  these  last  two  departments. 

The  Miscellaneous  series  is  but  begun.  I  have  prepared  a  list  of  useful 
tables,  which  were  no  doubt  welcome  to  the  lovers  of  Terrestrial  Physics, 
and  which  may  be  published  at  some  future  occasion,  if  you  should  then 
find  it  expedient. 

The  present  collection  being  designed,  not  for  the  scientific  only,  but  for 
the  observers  at  large,  the  propriety  of  the  explicit  and  popular  form  of 
the   explanations  which  accompany  the  tables,   and  of  the   directions  for 
.using  them,  will  readily  be  understood. 

I  close  by  the  remark,  that,  in  every  instance,  the  works  from  which  the 
tables  were  taken  have  been  carefully  noted,  and  due  credit  given  to  their 
authors.  For  all  the  tables  without  author's  names,  I  am  personally  re- 
sponsible. Nv 

I  remain,  Sir, 

Very  respectfully,  yours, 

A.  GUYOT. 

PRINCETON,  N.  J.,  December,  1857. 


CONTENTS. 


THE  Tables  contained  in  this  collection  are  divided  into  six  series,  as  follows  :  — 

I.  Thermometrical  Tables,   marked  A. 

II.  Hygrometrical  Tables,  "  B. 

III.  Barometrical  Tables,  "  d. 

IV.  Hypsometrical  Tables,          "  D. 
V.  Meteorological  Corrections,  "  E. 

VI.     Miscellaneous  Tables,  "  F. 

Each  series  has  an  independent  paging  running  through  all  the  tables  that  it  con- 
tains. 

The  letters  A,  B,  C,  D,  E,  F,  at  the  bottom  of  each  page,  indicate  the  series,  and 
the  figure  the  folio  of  the  series  to  which  the  page  belongs. 

The  figure  at  the  top  of  the  page  indicates  the  folio  of  the  particular  table  of 
which  the  page  is  a  part. 

At  the  head  of  each  series  is  found  a  detailed  table  of  its  contents. 


ERRATA  IN  THE  FIRST  EDITION. 


A,  page   7,  line  below  the  title,  instead  of  (32  +  f  a:0)  read  (32  -f  -f  x°). 

A,  "     21,  on  the  line  beginning  with  30,  in  the  last  four  columns, 

instead  of        100.75         100.97         101.20         101.42 
read  100.85         101.07         101.30         101.52. 

B,  "       7,  on  the  line  beginning  with  23°,  second  column,  instead  of  20.410,  read  20.888. 
B,     "    23,  on  the  line  beginning  with  12°,  third  column,  instead  of  5.87,  read  5.37. 

B,     "    30  -  32,  at  the  head  of  each  first  column,  Temperature  of  the  Air,  add  "  in  Centigrade  degrees." 
B,     "    40,  Table  II.,  first  part,  on  the  line  beginning  with  60,  column  headed  7,  instead  of  24.11,01, 

read  24.9,01. 
B,     "     "    Table  II.,  first  part,  on  the  line  beginning  with  70,  column  headed  5,  instead  of  27.4,47, 

read  27.8,47  ;  and  column  headed  8,  instead  of  28.11,77,  read  28.9,77. 
B,     "     "    Table  II.,  second  part,  on  the  line  beginning  with  70,  column  headed  5,  instead  of  328.47, 

read  332.47. 
B,     "    41,  Table  III.,  line  beginning  with  20,  the  five  last  columns, 

instead  of        63.54        66.08        68.62         71.16        73.70, 

read  63.50        66.04        68.58         71.12         73.66. 

B,  "  "  Table  III,  line  beginning  with  200,  column  headed  3,  instead  of  515.11,  read  515.61. 
B,  "  42,  Table  V.,  line  beginning  with  180,  column  headed  7,  instead  of  516.21,  read  506.21. 
B,  "  43,  Table  VI.,  first  part,  on  line  beginning  with  70,  column  headed  2,  instead  of  76.635,  read 

76.735. 
B,     "     "    Table  VI.,  second  part,  on  line  beginning  with  7,  the  last  eight  columns, 

instead  of     0.6483      0.6572      0.6661      0.6750      0.6839      0.6927      0.7016      0.7105, 

read  0.6395      0.6483      0.6572      0.6661      0.6750      0.6839      0.6927      0.7016. 

B,  "    43,  Table  VI.,  second  part,  on  line  beginning  with  12,  column  headed  5,  instead  of  1.1018, 

read  1.1102. 

C,  "     11,  on  line  beginning  with  26.5  inches,  column  headed  6,  instead  of  674.41,  read  674.61. 
C,     "      "    on  line  of  27.1  inches,  column  headed  1,  instead  of  688.38,  read  688.58. 

C,     "     12,  on  line  of  30.5  inches,  column  headed  2,  instead  of  778.20,  read  775.19. 

C,  "     39  and  41,  at  the  head  of  table,  instead  of  "  Tenths  of  Degrees,"  read  "  English  Inches." 

D,  "     28,  29,  and  30,  head  of  page,  instead  of  "  Tenths  of  a  Degree,"  read  "  Hundredths  of  a  Degree." 
D,     "     35,  note  at  the  bottom,  instead  of  "  Geology,"  read  "  Geodesy." 

D,     "     36,  on  line  beginning  with  160,  columns  headed  8  and  9,  instead  of  550.19  and  553.47, 

read  551.19  and  554.47. 

D,     "     36,  on  line  beginning  with  260,  columns  headed  2,  3,  5,  and  6, 

instead  of         860.59  863.87  879.43  882.72, 

read  859.60  862.88  869.44  872.72. 

D,    "     37,  on  line  beginning  with  620,  column  headed  4,  instead  of  2048.28,  read  2047.28. 

D,     "      "  «          «         770,  «  0,  "      2526.39,     "     2526.29. 

D,     "     38,         "  "          "         880,  "  5,  "      2903.69,     "    2903.60. 

D,     "      "  "          "        890,  "  6,  "     2939.79,     "    2939.69. 

D,     "      «  "          "        930,  "  5,  "     3069.64,     "    3067.64. 

D,     "      "  "  "          "         990,  "  4,  "     3261.71,     "     3261.21. 

D,     "      "  "          "        990,  "  5,  «     3264.59,     "    3264.49. 

D,     "     39,  on  line  beginning  with  1380,  columns  headed  3,  4,  5,  6,  7,  8, 

instead  of  4537.28        4540.56        4543.85        4547.13         4550.41         4553.69, 
read  4537.48        4540.76        4544.05        4547.33        4550.61         4553.89. 

D,     "     40,  on  line  beginning  with  1610,  column  headed  5,  instead  of  5292.65,  read  5298.65. 

D,     "     44,  Table  X.,  on  line  beginning  with  8,  column  headed  6,  instead  of  21.0205,  read  23.0205. 

D,     "     45,  Table  XII.,  on  line  beginning  with  column  0,  column  headed  5,  instead  of  0.83333,  read 
0.08333. 


ERRATA  IN  THIS   EDITION. 


B,  page  25,  on  line  beginning  with  12,  third  column,  for  5.87,  read  5.37. 

D,  "       9,  line  10  from  bottom,  for  "  coefficiency,"  read  "coefficient." 

D,  "  30,  line  4  from  bottom,  for  "  calculating,"  read  "  computing  by." 

D,  "     73,  line  7,  for  I,  read  L. 

D,  "     "    line  9,  for  "  dilatation,"  read  "  expansion." 

D,  "  122,  line  beginning  with  930,  column  headed  5,  for  3069.64,  read  3067.64. 

E,  "  65,  line  4,  for  "  Degrees  of  Fahrenheit,"  read  "  Degrees  of  Reaumur." 


METEOROLOGICAL    TABLES 


I. 


THERMOMETRICAL    TABLES 


CONTENTS 


COMPAKISON  OF  THE  THEKMOMETRICAL  SCALES. 

(The  figures  refer  to  the  folio  at  the  bottom  of  the  page.) 

ABLE  I.  Comparison  of  Fahrenheit's  Scale  with  the  Centigrade  and  Reau- 
mur's, full  degrees,  from  +212°  to  —39°,  .  .8 

"  II  Comparison  of  the  Centigrade  Scale  with  Reaumur's  and  Fahren- 
heit's, full  degrees,  from  +100°  to  +50°,  .  .  .  .  .  10 

"  III.  Comparison  of  Reaumur's  Scale  with  Fahrenheit's  and  the  Centi- 
grade, full  degrees,  from +80°  to +40°,  ....  10 

"    IV.     Conversion  of  Degrees  of  Fahrenheit  into  Centigrade  Degrees,  for 

every  tenth  of  a  degree,  from  +  122°  to  —  76°  F.,      .         .         .    13 

"      V.     Conversion  of  Degrees  of  Fahrenheit  into  Degrees  of  Reaumur,  for 

every  tenth  of  a  degree,  from  + 122°  to  —  38°  F.,       .         .        .  18 

"  VI.  Conversion  of  Centigrade  Degrees  into  Degrees  of  Fahrenheit,  for 
every  tenth  of  a  degree,  from  -f-50°  to  — 54°,  and  from  -j-100° 
to+89°C., 25 

"  VII.     Conversion  of  Centigrade  Degrees  into  Degrees  of  Reaumur,  for  every 

tenth  of  a  degree,  from  +40°  to  —40°  C.,  ....  28 

"  VIII.     Conversion  of  Degrees  of  Reaumur  into  Degrees  of  Fahrenheit,  for 

every  tenth  of  a  degree,  from  +40°  to  —40°  R.,  30 

"    IX.     Conversion  of  Degrees  of  Reaumur  into  Centigrade  Degrees  for  every 

tenth  of  a  degree,  from  +40°  to  —40°  R.,          .         .         .         .32 

"  X.  Value  of  any  number  of  Degrees  of  Fahrenheit,  expressed  by  a  cor- 
responding number  of  Centigrade  Degrees,  .  .  .  .  .34 

"  XL  Value  of  any  number  of  Degrees  of  Fahrenheit,  expressed  by  a  cor- 
responding number  of  Degrees  of  Reaumur,  .  .  .  .34 

'*  XII.  Value  of  any  number  of  Centigrade  Degrees,  expressed  by  a  cor- 
responding number  of  Degrees  of  Reaumur,  .  .  .  .34 

'•'  XIII.  Value  of  any  number  of  Centigrade  Degrees,  expressed  by  a  cor- 
responding number  of  Degrees  of  Fahrenheit,  .  .  .  .35 

"  XIV.  Value  of  any  number  of  Degrees  of  Reaumur,  expressed  by  a  cor- 
responding number  of  Centigrade  Degrees,  .  .  .  .  .35 

"  XV.     Value  of  any  number  of  Degrees  of  Reaumur  expressed  by  a  cor- 
responding number  of  Degrees  of  Fahrenheit,       .         .         .         .35 
A  3 


I. -III. 


GENERAL    COMPARISON 


OP 


THE   THERMOMETRICAL   SCALES, 


OR 


TABLES 

SHOWING  THE  CORRESPONDING  VALUES  OF  EACH  FULL  DEGREE  OF  FAHRENHEIT'S, 

CENTIGRADE,  AND   REAUMUR'S    THERMOMETERS,  FROM 

-f-2120   TO    — 39°   FAHRENHEIT. 


COMPARISON   OF   THE   THERMOMETRICAL   SCALES. 


THE  first  three  tables  of  this  set  give  a  simultaneous  comparison  of  the  three  scales 
mostly  used  at  present  in  Meteorology,  and  especially  of  the  portion  of  the  scales  not 
comprised  in  the  more  extensive  tables  which  follow  them.  They  form  thus  a  com- 
plement to  these  last  tables ;  but  as  most  of  the  temperatures  contained  in  them  do 
not  occur  in  Meteorology,  the  comparison  of  the  full  degrees  was  found  sufficient. 

These  three  tables  have  been  taken  from  E.  L.  ScliubartJi's  Collection  of  Physical 
Tables.  Berlin,  1836. 

Tables  IV.  to  IX.  being  more  useful  to  the  Meteorologist,  the  calculation  has  been 
carried  out  for  every  tenth  of  a  degree.  Tables  VII.  and  IX.  are  from  the  Annuaire 
Meteor ologique  de  France ;  the  others  have  been  calculated. 

A  comparison  of  the  Centigrade  and  Fahrenheit  degrees  near  the  boiling  point,  for 
every  tenth  of  a  degree,  for  the  sake  of  the  comparison  of  standard  thermometers, 
will  be  found  at  the  end  of  Table  VI. 

Tables  X.  to  XV.  will  be  found  useful  for  comparing  differential  results,  such  as 
ranges  of  temperature,  and  any  relative  amount  expressed  in  degrees  of  different 
scales,  without  reference  to  their  respective  zeros. 


I.    COMPARISON  OF  FAHRENHEIT'S  THERMOMETRICAL  SCALE  WITH  THE 
CENTIGRADE  AND  REAUMUR'S. 

r>  Fahr.  =  (a?  —  32°)  |  Centig.  =  (a*  —  32°)  |  Reaum. 


Fahren. 

Centigrade. 

Reaumur. 

Fahren. 

Centigrade. 

Reaumur. 

Fahren. 

Centigrade. 

Reaumur. 

+212 
211 

+100.00 
99.44 

+80.00 
79.56 

+172 
171 

+77.78 
77.22 

+62.22 
61.78 

+132 
131 

+55.56 
55.00 

+44.44 
44.00 

210 

98.89 

79.11 

170 

76.67 

61.33 

130 

54.44 

43.56 

209 

98.33 

78.67 

169 

76.11 

60.89 

129 

53.89 

43.11 

208 

97.78 

78.22 

168 

75.56 

60.44 

128 

53.33 

42.67 

207 

97.22 

77.78 

167 

75.00 

60.00 

127 

52.78 

42.22 

206 

96.67 

77.33 

166 

74.44 

59.56 

126 

52.22 

41.78 

205 

96.11 

76.89 

165 

73.89 

59.11 

125 

51.67 

41.33 

204 

95.56 

76.44 

164 

73.33 

58.67 

124 

51.11 

40.89 

203 

95.00 

76.00 

163 

72.78 

58.22 

123 

50.56 

40.44 

202 

94.44 

75.56 

162 

72.22 

57.78 

122 

50.00 

40.00 

201 

93.89 

75.11 

161 

71.67 

57.33 

121 

49.44 

39.56 

200 

93.33 

74.67 

160 

71.11 

56.89 

120 

48.89 

39.11 

199 

92.78 

74.22 

159 

70.56 

56.44 

119 

48.33 

38.67 

198 

92.22 

73.78 

158 

70.00 

56.00 

118 

47.78 

38.22 

197 

91.67 

73.33 

157 

69.44 

55.56 

117 

47.22 

37.78 

196 

91.11 

72.89 

156 

68.89 

55.11 

116 

46.67 

37.33 

195 

90.56 

72.44 

155 

68.33 

54.67 

115 

46.11 

36.89 

194 

90.00 

72.00 

154 

67.78 

54.22 

114 

45.56 

36.44 

193 

89.44 

71.56 

153 

67.22 

53.78 

113 

45.00 

36.00 

192 

88.89 

71.11 

152 

66.67 

53.33 

112 

44.44 

35.56 

191 

88.33 

70.67 

151 

66.11 

52.89 

111 

43.89 

35.11 

190 

87.78 

70.22 

150 

65.56 

52.44 

110 

43.33 

34.67 

189 

87.22 

69.78 

149 

65.00 

52.00 

109 

42.78 

34.22 

188 

86.67 

69.33 

148 

64.44 

51.56 

108 

42.22 

33.78 

187 

86.11 

68.89 

147 

63.89 

51.11 

107 

41.67 

33.33 

186 

85.56 

68.44 

146 

63.33 

50.67 

106 

41.11 

32.89 

185 

85.00 

68.00 

145 

62.78 

50.22 

105 

40.56 

32.44 

184 

84.44 

67.56 

144 

62.22 

49.78 

104 

40.00 

32.00 

183 

83.89 

67.11 

143 

61.67 

49.33 

103 

39.44 

31.56 

182 

83.33 

66.67 

142 

61.11 

48.89 

102 

38.89 

31.11 

181 

82.78 

66.22 

141 

60.56 

48.44 

101 

38.33 

30.67 

180 

82.22 

65.78 

140 

60.00 

48.00 

100 

37.78 

30.22 

179 

81.67 

65.33 

139 

59.44 

47.56 

99 

37.22 

29.78 

178 

81.11 

64.89 

138 

58.89 

47.11 

98 

36.67 

29.33 

177 

80.56 

64.44 

137 

58.33 

46.67 

97 

36.11 

28.89 

176 

80.00 

64.00 

136 

57.78 

46.22 

96 

35.56 

28.44 

175 

79.44 

63.56 

135 

57.22 

45.78 

95 

35,00 

28.00 

174 

78.89 

63.11 

134 

56.67 

45.33 

94 

34.44 

27.56 

173 

78.33 

62.67 

133 

56.11 

44.89 

93 

33.89 

27.11 

COMPARISON  OF  FAHR/S  THERMOMETRICAL  SCALE  WITH  THE  CENTIG.  AND  REATJM.     2 
y?  Fahr.  =  (z°  —  32°)  |  Centig.  =  (ar>  —  32°)  f  Reaum. 


Fahren. 

Centigrade. 

Reaumur. 

Fahren. 

Centigrade. 

Reaumur. 

Fahren. 

Centigrade. 

Reaumur. 

+92 
91 

+33.33 
32.78 

+26.67 
26.22 

+48 
47 

+  8.89 
8.33 

+  7.11 

6.67 

+  4 
3 

-15.56 
-16.11 

-12.44 
-12.89 

90 

32.22 

25.78 

46 

7.78 

6.22 

2 

-16.67 

-13.33 

89 

31.67 

25.33 

45 

7.22 

5.78 

1 

-17.22 

-13.78 

88 

31.11 

24.89 

44 

6.67 

5.33 

0 

-17.78 

-14.22 

87 

30.56 

24.44 

43 

6.11 

4.89 

-  1 

-18.33 

-14.67 

86 

30.00 

24.00 

42 

5.56 

4.44 

-  2 

-18.89 

-15.11 

85 

29.44 

23.56 

41 

5.00 

4.00 

-  3 

-19.44 

-15.56 

84 

28.89 

23.11 

40 

4.44 

3.56 

-  4 

-20.00 

-16.00 

83 

28.33 

22.67 

39 

3.89 

3.11 

-  5 

-20.56 

-16.44 

82 

27.78 

22.22 

38 

3.33 

2.67 

-  6 

-21.11 

-16.89 

81 

27.22 

21.78 

37 

2.78 

2.22 

-  7 

-21.67 

-17.33 

80 

26.67 

21.33 

36 

2.22 

1.78 

-  8 

-22.22 

-17.78 

79 

26.11 

20.89 

35 

1.67 

1.33 

-  9 

-22.78 

-18.22 

78 

25.56 

20.44 

34 

1.11 

0.89 

-10 

-23.33 

-18.67 

77 

25.00 

20.00 

33 

0.56 

0.44 

-11 

-23.89 

-19.11 

76 

24.44 

19.56 

32 

0.00 

0.00 

-12 

-24.44 

-19.56 

75 

23.89 

19.11 

31 

-  0.56 

-  0.44 

-13 

-25.00 

-20.00 

74 

23.33 

18.67 

30 

-  1.11 

-  0.89 

-14 

-25.56 

-20.44 

73 

22.78 

18.22 

29 

-  1.67 

-  1.33 

-15 

-26.11 

-20.89 

72 

22.22 

17.78 

28 

-  2.22 

-  1.78 

-16 

-26.67 

-21.33 

71 

21.67 

17.33 

27 

-  2.78 

-  2.22 

-17 

-27.22 

-21.78 

70 

21.11 

16.89 

26 

-  3.33 

-  2.67 

-18 

-27.78 

-22.22 

69 

20.56 

16.44 

25 

-  3.89 

-  3.11 

-19 

-28.33 

-22.67 

68 

20.00 

16.00 

24 

-  4-44 

-  3.56 

-20 

-28.89 

-23.11 

67 

19.44 

15.56 

23 

-  5-00 

-  4.00 

-21 

-29.44 

-23.56 

66 

18.89 

15.11 

22 

-  5.56 

-  4.44 

-22 

-30.00 

-24.00 

65 

18.33 

14.67 

21 

-  6.11 

-  4.89 

-23 

-30.56 

-24.44 

64 

17.78 

14.22 

20 

-  6-67 

-  5.33 

-24 

-31.11 

-24.89 

63 

17.22 

13.78 

19 

-  7.22 

-  5.78 

-25 

-31.67 

-25.33 

62 

16.67 

13.33 

18 

-  7.78 

-  6.22 

-26 

-32.22 

-25.78 

61 

16.11 

12.89 

17 

-  8.33 

-  6.67 

-27 

-32.78 

-26.22 

60 

15.56 

12.44 

16 

-  8-89 

-  7.11 

-28 

-33.33 

-26.67 

59 

15.00 

12.00 

15 

-  9-44 

-  7.56 

-29 

-33.89 

-27.11 

58 

14.44 

11.56 

14 

-10-00 

-  8.00 

-30 

-34.44 

-27.56 

57 

13.89 

11.11 

13 

-10-56 

-  8.44 

-31 

-35.00 

-28.00 

56 

13.33 

10.67 

12 

-11.11 

-  8.89 

-32 

-35.56 

-28.44 

55 

12.78 

10.22 

11 

-11-67 

-  9.33 

-33 

-36.11 

-28.89 

54 

12.22 

9.78 

10 

-12-22 

-  9.78 

-34 

-36.67 

-29.33 

53 

11.67 

9.33 

9 

-12.78 

-10.22 

-35 

-37.22 

-29.78 

52 

11.11 

8.89 

8 

-13.33 

-10.67 

-36 

-37.78 

-30.22 

51 

10.56 

8.44 

7 

-13-89 

-11.11 

-37 

-38.33 

-30.67 

50 

10.00 

8.00 

6 

-14-44 

-11.56 

-38 

-38.89 

-31.11 

49 

9.44 

7.56 

5 

-15-00 

-12.00 

-39 

-39.44 

-31.56 

For  the  Continuation  see  Table  IV.  and  V. 

II.    COMPARISON  OF    THE    CENTIGRADE    THERMOMETER  WITH  REAUMUR'S 

AND  FAHRENHEIT'S. 

x°  Centig.  =  (32  +  f  a?)  Fahr.  =  f  a?  Reaum. 


Centig. 

Reaumur. 

Fahrenheit. 

Centig. 

Reaumur. 

Fahrenheit. 

Centig. 

Reaumur. 

Fahrenheit. 

+100 

+80.0 

+212.0 

+  83 

+66.4 

+  181.4 

+  66 

+52.8 

+150.8 

99 

79.2 

210.2 

82 

65.6 

179.6 

65 

52.0 

149.0 

98 

78.4 

208.4 

81 

64.8 

177.8 

64 

51.2 

147.2 

97 

77.6 

206.6 

SO 

64.0 

176.0 

63 

50.4 

145.4 

96 

76.8 

204.8 

79 

63.2 

174.2 

62 

49.6 

143.6 

95 

76.0 

203.0 

78 

62.4 

172.4 

61 

48.8 

141.8 

94 

75.2 

201.2 

77 

61.6 

170.6 

60 

48.0 

140.0 

93 

74.4 

199.4 

76 

60.8 

168.8 

59 

47.2 

138.2 

92 

73.6 

197.6 

75 

60.0 

167.0 

58 

46.4 

136.4 

91 

72.8 

195.8 

74 

59.2 

165.2 

•  57 

45.6 

134.6 

90 

72.0 

194.0 

73 

58.4 

163.4 

56 

44.8 

132.8 

89 

71.2 

192.2 

72 

57.6 

161.6 

55 

44.0 

131.0 

88 

70.4 

190.4 

71 

56.8 

159.8 

54 

43.2 

129.2 

87 

69.6 

188.6 

70 

56.0 

158.0 

53 

42.4 

127.4 

86 

68.8 

186.8 

69 

55.2 

156.2 

52 

41.6 

125.6 

85 

68.0 

185.0 

68 

54.4 

154.4 

51 

40.8 

123.8 

84 

67.2 

183.2 

67 

53.6 

152.6 

50 

40.0 

122.0 

For  the  Continuation  see  Tables  V.  and  VI. 

III.    COMPARISON  OF  REAUMUR'S  THERMOMETER  WITH  FAHRENHEIT'S 

AND  THE   CENTIGRADE. 

y°  Reaum.  =  (32°  +  |  z°)  Fahr.  =\aP  Centig. 

Reaumur. 

Fahrenheit. 

Centigrade. 

Reaumur. 

Fahrenheit. 

Centigrade. 

Reaumur. 

Fahrenheit. 

Centigrade. 

+80 

+212.00 

+100.00 

+66 

+180.50 

+82.50 

+52 

+149.00 

+65.00 

79 

209.75 

98.75 

65 

178.25 

81.25 

51 

146.75 

63.75 

78 

207.50 

97.50 

64 

176.00 

80.00 

50 

144.50 

62.50 

77 

205.25 

96.25 

63 

173.75 

78.75 

49 

142.25 

61.25 

76 

203.00 

95.00 

62 

171.50 

77.50 

48 

140.00 

60.00 

75 

200.75 

93.75 

61 

169.25 

76.25 

47 

137.75 

58.75 

74 

198.50 

92.50 

60 

167.00 

75.00 

46 

135.50 

57.50 

73 

196.25 

91.25 

59 

164.75 

73.75 

45 

133.25 

56.25 

72 

194.00 

90.00 

58 

162.50 

72.50 

44 

131.00 

55.00 

71 

191.75 

88.75 

57 

160.25 

71.25 

43 

128.75 

53.75 

70 

189.50 

87.50 

56 

158.00 

70.00 

42 

126.50 

52.50 

69 

187.25 

86.25 

55 

155.75 

68.75 

41 

124.25 

51.25 

68 

185.00 

85.00 

54 

153.50 

67.50 

40 

122.00 

50.00 

67 

182.75 

83.75 

53 

151.25 

66.25 

39 

119.75 

48.75 

For  the  Continuation  see  Tables  VIII.  and  IX. 

10 


IV.-V. 

COMPARISON 


OP 


FAHRENHEIT'S  THERMOMETEE 


WITH 


THE   CENTIGRADE  AND  WITH  THAT  OF  REAUMUR, 


OB 


TABLES 

FOR  CONVERTING  THE  DEGREES  OP  FAHRENHEIT  INTO  CENTIGRADE  DEGREES  AND 
INTO  DEGREES  OF  REAUMUR; 

GIVING  THE  CORRESPONDING  VALUES  FOR  EACH  TENTH  OF  A  DEGREE, 
FROM  +122°  TO  — 76°  FAHRENHEIT. 


11 


IV.   CONVERSION  OF  DEGREES  OF  FAHRENHEIT  INTO  CENTIGRADE  DEGREES. 


Degrees  of 
Fahren- 
heit. 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

+122 

Centig. 
+50.00 

Centig. 
+50.06 

Centig. 
+50.11 

Centig. 
+50.17 

Centig. 
+50.22 

Centig. 
+50.28 

Centig. 
+50.33 

Centig. 
+50.39 

Centig. 
+50.44 

Centig. 
+50.50 

121 

49.44 

49.50 

49.56 

49.61 

49.67 

49.72 

49.78 

49.83 

49.89 

49.94 

120 

48.89 

49.94 

49.00 

49.06 

49.11 

49.17 

49.22 

49.28 

49.33 

49.39 

119 

48.33 

48.39 

48.44 

48.50 

48.56 

48.61 

48.67 

48.72 

48.78 

48.83 

118 

47.78 

47.83 

47.89 

47.94 

48.00 

48.06 

48.11 

48.17 

48.22 

48.28 

117 

47.22 

47.28 

47.33 

47.39 

47.44 

47.50 

47.56 

47.61 

47.67 

47.72 

116 

46.67 

46.72 

46.78 

46.83 

46.89 

46.94 

47.00 

47.06 

47.11 

47.17 

115 

46.11 

46.17 

46.22 

46.28 

46.33 

46.39 

46.44 

46.50 

46.56 

46.61 

114 

45.56 

45.61 

45.67 

45.72 

45.78 

45.83 

45.89 

45.94 

46.00 

46.06 

113 

45.00 

45.06 

45.11 

45.17 

45.22 

45.28 

45.33 

45.39 

45.44 

45.50 

112 

44.44 

41.50 

44.56 

44.61 

44.67 

44.72 

44.78 

44.83 

44.89 

44.94 

111 

43.89 

43.94 

44.00 

44.06 

44.11 

44.17 

44.22 

44.28 

44.33 

44.39 

110 

43.33 

43.39 

43.44 

43.50 

43.56 

43.61 

43.67 

43.72 

43.78 

.  43.83 

109 

42.78 

42.83 

42.89 

42.94 

43.00 

43.06 

43.11 

43.17 

43.22 

43.28 

108 

42.22 

42.28 

42.33 

42.39 

42.44 

42.50 

42.56 

42.61 

42.67 

42.72 

107 

41.67 

41.72 

41.78 

41.83 

41.89 

41.94 

42.00 

42.06 

42.11 

42.17 

106 

41.11 

41.17 

41.22 

41.28 

41.33 

41.39 

41.44 

41.50 

41.56 

41.61 

105 

40.56 

40.61 

40.67 

40.72 

40.78 

40.83 

40.89 

40.94 

41.00 

41.06 

104 

40.00 

40.06 

40.11 

40.17 

40.22 

40.28 

40.33 

40.39 

40.44 

40.50 

103 

39.44 

39.50 

39.56 

39.61 

39.67 

39.72 

39.78 

39.83 

39.89 

39.94 

102 

38.89 

38.94 

39.00 

39.06 

39.11 

39.17 

39.22 

39.28 

39.33 

39.39 

101 

38.33 

38.39 

38.44 

38.50 

38.56 

38.61 

38.67 

38.72 

38.78 

38.83 

100 

37.78 

37.83 

37.89 

37.94 

38.00 

38.06 

38.11 

38.17 

38.22 

38.28 

99 

37.22 

37.28 

37.33 

37.39 

37.44 

37.50 

37.56 

37.61 

37.67 

37.72 

98 

36.67 

36.72 

36.78 

36.83 

36.89 

36.94 

37.00 

37.06 

37.11 

37.17 

97 

36.11 

36.17 

36.22 

36.28 

36.33 

36.39 

36.44 

36.50 

36.56 

36.61 

96 

35.56 

35.61 

35.67 

35.72 

35.78 

35.83 

35.89 

35.94 

36.00 

36.06 

95 

35.00 

35.06 

35.11 

35.17 

35.22 

35.28 

35.33 

35.39 

35.44 

35.50 

94 

34.44 

34.50 

34.56 

34.61 

34.67 

34.72 

34.78 

34.83 

34.89 

34.94 

93 

33.89 

33.94 

34.00 

34.06 

34.11 

34.17 

34.22 

34.28 

34.33 

34.39 

92 

33.33 

33.39 

33.44 

33.50 

33.56 

33.61 

33.67 

33.72 

33.78 

33.83 

91 

32.78 

32.83 

32.89 

32.94 

33.00 

33.06 

33.11 

33.17 

33.22 

33.28 

90 

32.22 

32.28 

32.33 

32.39 

32.44 

32.50 

32.56 

32.61 

32.67 

32.72 

89 

31.67 

31.72 

31.78 

31.83 

31.89 

31.94 

32.00 

32.06 

32.11 

33.17 

88 

31.11 

31.17 

31.22 

31.28 

31.33 

31.39 

31.44 

31.50 

31.56 

31.61 

87 

30.56 

30.61 

30.67 

30.72 

30.78 

30.83 

30.89 

30.94 

31.00 

31.06 

86 

30.00 

30.06 

30.11 

30.17 

30.22 

30.28 

30.33 

30.39 

30.44 

30.50 

85 

29.44 

29.50 

29.56 

29.61 

29.67 

29.72 

29.78 

29.83 

29.89 

29.94 

84 

28.89 

28.94 

29.00 

29.06 

29.11 

29.17 

29.22 

29.28 

29.33 

29.39 

83 

28.33 

28.39 

28.44 

28.50 

28.56 

28.61 

28.67 

28.72 

28.78 

28.83 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

A 


13 


CONVERSION    OF    DEGREES    OF    FAHRENHEIT   INTO    CENTIGRADE    DEGREES. 


Degrees  of 
Fahren- 
heit. 

Tenths  of  Degrees. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

+82 

Centig. 
+27.78 

Centig. 
+27.83 

Centig. 
+27.89 

Centig. 
+27.94 

Centig. 
+28.00 

Centig. 
+28.06 

Centig. 
+28.11 

Centig. 
+28.17 

Centig. 
+28.22 

Centig. 
+28.28 

81 

27.22 

27.28 

27.33 

27.39 

27.44 

27.50 

27.56 

27.61 

27.67 

27.72 

80 

26.67 

26.72 

26.78 

26.83 

26.89 

26.94 

27.00 

27.06 

27.11 

27.17 

79 

26.11 

26.17 

26.22 

26.28 

26.33 

26.39 

26.44 

26.50 

26.56 

26.61 

78 

25.56 

25.61 

25.67 

25.72 

25.78 

25.83 

25.89 

25.94 

26.00 

26.06 

77 

25.00 

25.06 

25.11 

25.17 

25.22 

25.28 

25.33 

25.39 

25.44 

25.50 

76 

24.44 

24.50 

24.56 

24.61 

24.67 

24.72 

24.78 

24.83 

24.89 

24.94 

75 

23.89 

23.94 

24.00 

24.06 

24.11 

24.17 

24.22 

24.28 

24.33 

24.39 

74 

23.33 

23.39 

23.44 

23.50 

23.56 

23.61 

23.67 

23.72 

23.78 

23.83 

73 

22.78 

22.83 

22.89 

22.94 

23.00 

23.06 

23.11 

23.17 

23.22 

23.28 

72 

22.22 

22.28 

22.33 

22.39 

22.44 

22.50 

22.56 

22.61 

22.67 

22.72 

71 

21.67 

21.72 

21.78 

21.83 

21.89 

21.94 

22.00 

22.06 

22.11 

22.17 

70 

21.11 

21.17 

21.22 

21.28 

21.33 

21.39 

21.44 

21.50 

21.56 

21.61 

69 

20.56 

20.61 

20.67 

20.72 

20.78 

20.83 

20.89 

20.94 

21.00 

21.06 

68 

20.00 

20.06 

20.11 

20.17 

20.22 

20.28 

20.33 

20.39 

20.44 

20.50 

67 

19.44 

19.50 

19.56 

19.61 

19.67 

19.72 

19.78 

19.83 

19.89 

19.94 

66 

18.89 

18.94 

19.00 

19.06 

19.11 

19.17 

19.22 

19.28 

19.33 

19.39 

65 

18.33 

18.39 

18.44 

18.50 

18.56 

18.61 

18.67 

18.72 

18.78 

18.83 

64 

17.78 

17.83 

17.89 

17.94 

18.00 

18.06 

18.11 

18.17 

18.22 

18.28 

63 

17.22 

17.28 

17.33 

17.39 

17.44 

17.50 

17.56 

17.61 

17.67 

17.72 

62 

16.67 

16.72 

16.78 

16.83 

16.89 

16.94 

17.00 

17.06 

17.11 

17.17 

61 

16.11 

16.17 

16.22 

16.28 

16.33 

16.39 

16.44 

16.50 

16.56 

16.61 

60 

15.56 

15.61 

15.67 

15.72 

15.78 

15.83 

15.89 

15.94 

16.00 

16.06 

59 

15.00 

15.06 

15.11 

15.17 

15.22 

15.28 

15.33 

15.39 

15.44 

15.50 

58 

14.44 

14.50 

14.56 

14.61 

14.67 

14.72 

14.78 

14.83 

14.89 

14.94 

57 

13.89 

13.94 

14.00 

14.06 

14.11 

14.17 

14.22 

14.28 

14.33 

14.39 

56 

13.33 

13.39 

13.44 

13.50 

13.56 

13.61 

13.67 

13.72 

13.78 

13.83 

55 

12.78 

12.83 

12.89 

12.94 

13.00 

13.06 

13.11 

13.17 

13.22 

13.28 

54 

12.22 

12.28 

12.33 

12.39 

12.44 

12.50 

12.56 

12.61 

12.67 

12.72 

53 

11.67 

11.72 

11.78 

11.83 

11.89 

11.94 

12.00 

12.06 

12.11 

12.17 

52 

11.11 

11.17 

11.22 

11.28 

11.33 

11.39 

11.44 

11.50 

11.56 

11.61 

51 

10.56 

10.61 

10.67 

10.72 

10.78 

10.83 

10.89 

10.94 

11.00 

11.06 

50 

10.00 

10.06 

10.11 

10.17 

10.22 

10.28 

10.33 

10.39 

10.44 

10.50 

49 

9.44 

9.50 

9.56 

9.61 

9.67 

9.72 

9.78 

9.83 

9.89 

9.94 

48 

8.89 

8.94 

9.00 

9.06 

9.11 

9.17 

9.22 

9.28 

9.33 

9.39 

47 

8.33 

8.39 

8.44 

8.50 

8.56 

8.61 

8.67 

8.72 

8.78 

8.83 

46 

7.78 

7.83 

7.89 

7.94 

8.00 

8.06 

8.11 

8.17 

8.22 

8.28 

45 

7.22 

7.28 

7.33 

7.39 

7.44 

7.50 

7.56 

7.61 

7.67 

7.72 

44 

6.67 

6.72 

6.78 

6.83 

6.89 

6.94 

7.00 

7.06 

7.11 

7.17 

43     s 

6.11 

6.17 

6.22 

6.28 

6.33 

6.39 

6.44 

6.50 

6.56 

6.61 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

14 


CONVERSION  OF  DEGREES  OF  FAHRENHEIT  INTO  CENTIGRADE  DEGREES. 


Degrees  of 
Fahren- 
heit. 

Tenths  of  Degrees. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

+42 

Centig. 
+5.56 

Centig. 
+5.61 

Centig. 
+5.67 

Centig. 
+5.72 

Centig. 
+5.78 

Centig. 
+5.83 

Centig. 
+5.89 

Centig. 
+5.94 

Centig. 
+6.00 

Centig. 
+6.06 

41 

5.00 

5.06 

5.11 

5.17 

5.22 

5.28 

5.33 

5.39 

5.44 

5.50 

40 

4.44 

4.50 

4.56 

4.61 

4.67 

4.72 

4.78 

4.83 

4.89 

4.94 

39 

3.89 

3.94 

4.00 

4.06 

4.11 

4.17 

4.22 

4.28 

4.33 

4.39 

38 

3.33 

3.39 

3.44 

3.50 

3.56 

3.61 

3.67 

3.72 

3.78 

3.83 

37 

2.78 

2.S3 

2.89 

2.94 

3.00 

3.06 

3.11 

3.17 

3.22 

3.28 

36 

2.22 

2.28 

2.33 

2.39 

2.44 

2.50 

2.56 

2.61 

2.67 

2.72 

35 

1.67 

1.72 

1.78 

1.83 

1.89 

1.94 

2.00 

2.06 

2.11 

2.17 

34 

1.11 

1.17 

1.22 

1.28 

1.33 

1.39 

1.44 

1.50 

1.56 

1.61 

33 

0.56 

0.61 

0.67 

0.72 

0.78 

0.83 

0.89 

0.94 

1.00 

1.06 

32 

0.00 

0.06 

0.11 

0.17 

0.22 

0.28 

0.33 

0.39 

0.44 

0.50 

31 

-  0.56 

-  0.50 

-  0.44 

-  0.39 

-  0.33 

-  0.28 

-  0.22 

-  0.17 

-  0.11 

-  0.06 

30 

-  1.11 

-  1.06 

-  1.00 

-  0.94 

-  0.89 

-  0.83 

-  0.78 

-  0.72 

-  0.67 

-  0.61 

29 

-  1.67 

-  1.61 

-  1.56 

-  1.50 

-  1.44 

-  1.39 

-  1.33 

-  1.28 

-  1.22 

-  1.17 

^    28 

-  2.22 

-  2.17 

-2.11 

-  2.06 

-  2.00 

-  1.94 

-  1.89 

-  1.83 

-  1.78 

-  1.72 

27 

-  2.78 

-  2.72 

-  2.67 

-  2.61 

-  2.56 

-  2.50 

-  2.44 

-  2.39 

-  2.33 

-  2.28 

26 

-  3.33 

-  3.28 

-  3.22 

-  3.17 

-  3.11 

-  3.06 

-  3.00 

-  2.94 

-  2.89 

-  2.83 

25 

-  3.89 

-  3.83 

-  3.78 

-  3.72 

-  3.67 

-  3.61 

-  3.56 

-  3.50 

-  3.44 

-  3.39 

24 

-  4.44 

-  4.39 

-  4.33 

-  4.28 

-  4.22 

-  4.17 

-  4.11 

-  4.06 

-  4.00 

-  3.94 

23 

-  5.00 

-  4.94 

-  4.89 

-  4.83 

-  4.78 

-  4.72 

-  4.67 

-  4.61 

-  4.56 

-  4.50 

22 

-  5.56 

-  5.50 

-  5.44 

-  5.39 

-  5.33 

-  5.28 

-  5.22 

-  5.17 

-  5.11 

-  5.06 

21 

-  6.11 

-  6.06 

-  6.00 

-  5.94 

-  5.89 

-  5.83 

-  5.78 

-  5.72 

-  5-67 

-  5.61 

20 

-  6.67 

-  6.61 

-  6.56 

-  6.50 

-  6.44 

-  6.39 

-  6.33 

-  6.28 

-  6.22 

-  6.17 

19 

-  7.22 

-  7.17 

-  7.11 

-  7.06 

-  7.00 

-  6.94 

-  6.89 

-  6.83 

-  6.78 

-  6.72 

18 

-  7.78 

-  7.72 

-  7.67 

-  7.61 

-  7.56 

-  7.50 

-  7.44 

-  7.39 

-  7.33 

-  7.28 

17 

-  8.33 

-  8.28 

-  8.22 

-  8.17 

-  8.11 

-  8.06 

-  8.00 

-  7.94 

-  7.89 

-  7.83 

16 

-  8.89 

-  8.83 

-  8.78 

-  8.72 

-  8.67 

-  8.61 

-  8.56 

-  8.50 

-  8.44 

-  8.39 

15 

-  9.44 

-  9.39 

-  9.33 

-  9.28 

-  9.22 

-  9.17 

-  9.11 

-  9.06 

-  9.00 

-  8.94 

14 

-10.00 

-  9.94 

-  9.89 

-  9,83 

-  9.78 

-  9.72 

-  9.67 

-  9.61 

-  9.56 

-  9.50 

13 

-10.56 

-11.50 

-10.44 

-10.39 

-10.33 

-10.28 

-10.22 

-10.17 

-10.11 

-10.06 

12 

-11.11 

-11.06 

-11.00 

-10.94 

-10.89 

-10.83 

-10.78 

-10.72 

-10.67 

-10.61 

11 

-11.67 

-11.61 

-11.56 

-11.50 

-11.44 

-11.39 

-11.33 

-11.28 

-11.22 

-11.17 

10 

-12.22 

-12.17 

-12.11 

-12.06 

-12.00 

-11.94 

-11.89 

-11.83 

-11.78 

-11.72 

9 

-12.78 

-12.72 

-12.67 

-12.61 

-12.56 

-12.50 

-12.44 

-12.39 

-12.33 

-12.28 

8 

-13.33 

-13.28 

-13.22 

-13.17 

-13.11 

-13.06 

-13.00 

-12.94 

-12.89 

-12.83 

7 

-13.89 

-13.83 

-13.78 

-13.72 

-13.67 

-13.61 

-13.56 

-13.50 

-13.44 

-13.39 

6 

-14.44 

-14.39 

-14.33 

-14.28 

-14.22 

-14.17 

-14.11 

-14.06 

-14.00 

-13.94 

5 

-15.00 

-14.94 

-14.89 

-14.83 

-14.78 

-14.72 

-14.67 

-14.61 

-14.56 

-14.50 

4 

-15.56 

-15.50 

-15.44 

-15.39 

-15.33 

-15.28 

-15.22 

-15.17 

-15.11 

-15.06 

3 

-16.11 

-16.06 

-16.00 

-15.94 

-15.89 

-15.83 

-15.78 

-15.72 

-15.67 

-15.61 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

15 


CONVERSION  OF  DEGREES  OF  FAHRENHEIT  INTO  CENTIGRADE  DEGREES. 


Degrees  of 
Fahren- 
heit. 

Tenths  of  Degrees. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

f). 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

+  2 

-16.67 

-16.61 

-16.56 

-16.50 

-16.44 

-16.39 

-16.33 

-16.28 

-16.22 

-16.17 

1 

-17.22 

-17.17 

-17.11 

-17.06 

-17.00 

-16.94 

-16.89 

-16.83 

-16.78 

-16.72 

0 

-17.78 

-17.72 

-17.67 

-17.61 

-17.56 

-17.50 

-17.44 

-17.39 

-17.33 

-17.28 

-  0 

-17.78 

-17.83 

-17.89 

-17.94 

-18.00 

-18.06 

-18.11 

-18.17 

-18.22 

-18.28 

-  1 

-18.33 

-18.39 

-18.44 

-18.50 

-18.56 

-18.61 

-18.67 

-18.72 

-18.78 

-18.83 

-  2 

-18.89  - 

-18.94 

-19.00 

-19.06 

-19.11 

-19.17 

-19.22 

-19.28 

-19.33 

-19.39 

-  3 

-19.44 

-19.50 

-19.56 

-19.61 

-19.67 

-19.72 

-19.78 

-19.83 

-19.89 

-19.94 

-  4 

-20.00 

-20.06 

-20.11 

-20.17 

-20.22 

-20.28 

-20.33 

-20.39 

-20.44 

-20.50 

-  5 

-20.56 

-20.61 

-20.67 

-20.72 

-20.78 

-20.83 

-20.89 

-20.94 

-21.00 

-21.06 

-  6 

-21.11 

-21.17 

-21.22 

-21.28  ' 

-21.33 

-21.39 

-21.44 

-21.50 

-21.56 

-21.61 

-  7 

-21.67 

-21.72 

-21.78 

-21.83 

-21.89 

-21.94 

-22.00 

-22.06 

-22.11 

-22.17 

-  8 

-22.22 

-22.28 

-22.33 

-22.39 

-22.44 

-22.50 

-22.56 

-22.61 

-22.67 

-22.72 

-  9 

-22.78 

-22.83 

-22.89 

-22.94 

-23.00 

-23.06 

-23.11 

-23.17 

-23.22 

-23.28 

-10 

-23.33 

-23.39 

-23.44 

-23.50 

-23.56 

-23.61 

-23.67 

-23.72 

-23.78 

-23.83 

-11 

-23.89 

-23.94 

-24.00 

-24.06 

-24.11 

-24.17 

-24.22 

-24.28 

-24.33 

-24.39  ' 

-12 

-24.44 

-24.50 

-24.56 

-24.61 

-24.67 

-24.72 

-24.78 

-24.83 

-24.89 

-24.94 

-13 

-25.00 

-25.06 

-25.11 

-25.17 

-25.22 

-25.28 

-25.33 

-25.39 

-25.44 

-25.50 

-14 

-25.56 

-25.61 

-25.67 

-25.72 

-25.78 

-25.83 

-25.89 

-25.94 

-26.00 

-26.06 

-15 

-26.11 

-26.17 

-26.22 

-26.28 

-26.33 

-26.39 

-26.44 

-26.50 

-26.56 

-26.61 

-16 

-26.67 

-26.72 

-26.78 

-26.83 

-26.89 

-26.94 

-27.00 

-27.06 

-27.11 

-27.17 

-17 

-27.22 

-27.28 

-27.33 

-27.39 

-27.44 

-27.50 

-27.56 

-27.61 

-27.67 

-27.72 

-18 

-27.78 

-27.83 

-27.89 

-27.94 

-28.00 

-28.06 

-28.11 

-28.17 

-28.22 

-28.28 

-19 

-28.33 

-28.39 

-28.44 

-28.50 

-28.56 

-28.61 

-28.67 

-28.72 

-28.78 

-28.83 

-20 

-28.89 

-28.94 

-29.00 

-29.06 

-29.11 

-29.17 

-29.22 

-29.28 

-29.33 

-29.39 

-21 

-29.44 

-29.50 

-29.56 

-29.61 

-29.67 

-29.72 

-29.78 

-29.83 

-29.89 

-29.94 

-22 

-30.00 

-30.06 

-30.11 

-30.17 

-30.22 

-30.28 

-30.33 

-30.39 

-30.44 

-30.50 

-23 

-30.56 

-30.61 

-30.67 

-30.72 

-30.78 

-30.83 

-30.89 

-30.94 

-31.00 

-31.06 

-24 

-31.11 

-31.17 

-31.22 

-31.28 

-31.33 

-31.39 

-31.44 

-31.50 

-31.56 

-31.61 

-25 

-31.67 

-31.72 

-31.78 

-31.83 

-31.89 

-31.94 

-32.00 

-32.06 

-32.11 

-32.17 

-26 

-32.22 

-32.28 

-32.33 

-32.39 

-32.44 

-32.50 

-32.56 

-32.61 

-32.67 

-32.72 

-27 

-32.78 

-32.83 

-32.89 

-32.94 

-33.00 

-33.06 

-33.11 

-33.17 

-33.22 

-33.28 

-28 

-33-33 

-33.39 

-33.44 

-33.50 

-33.56 

-33.61 

T33.67 

-33.72 

-33.78 

-33.83 

-29 

-33.89 

-33.94 

-34.00 

-34.06 

-34.11 

-34.17 

-34.22 

-34.28 

-34.33 

-34.39 

-30 

-34.44 

-34.50 

-34.56 

-34.61 

-34.67 

-34.72 

-34.78 

-34.83 

-34.89 

-34.94 

-31 

-35.00 

-35.06 

-35.11 

-35.17 

-35.22 

-35.28 

-35.33 

-35.39 

-35.44 

-35.50 

-32 

-35.56 

-35.61 

-35.67 

-35.72 

-35.78 

-35.83 

-35.89 

-35.94 

-36.00 

-36.06 

-33 

-36.11 

-36.17 

-36.22 

-36.28 

-36.33 

-36.39 

-36.44 

-36.50 

-36.56 

-36.61 

-34 

-36.67 

-36.72 

-36.78 

-36.83 

-36.89 

-36.94 

-37.00 

-37.06 

-37.11 

-37.17 

-35 

-37.22 

-37.28 

-37.33 

-37.39 

-37.44 

-37.50 

-37.56 

-37.61 

-37-67 

-37.72 

-36 

-37.78 

-37.83 

-37.89 

-37.94 

-38.00 

-38.06 

-38.11 

-38.17 

-38.22 

-38.28 

0. 

1. 

2. 

3.i 

4. 

5. 

6. 

•7. 

§. 

9. 

16 


CONVERSION    OF    DEGREES    OF    FAHRENHEIT    INTO    CENTIGRADE    DEGREES. 


Tenths  of  Degrees. 

Degrees  of 

Fahren- 

heit. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

*?. 

§. 

9. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

-37 

-38.33 

-38.39 

-38.44 

-38.50 

-38.56 

-38.61 

-38.67 

-38.72 

-38.78 

-38.83 

-38 

-38.89 

-38.94 

-39.00 

-39.06 

-39.11 

-39.17 

-39.22 

-39.28 

-39.33 

-39.39 

-39 

-39.44 

-39.50 

-39.56 

-39.61 

-39.67 

-39.72 

-39.78 

-39.83 

-39.89 

-39.94 

-40 

-40.00 

-40.06 

-40.11 

-40.17 

-40.22 

-40.28 

-40.33 

-40.39 

-40.44 

-40.50 

-41 

-40.56 

-40.61 

-40.67 

-40.72 

-40.78 

-40.83 

-40.89 

-40.94 

-41.00 

-41.06 

-42 

-41.11 

-41.17 

-41.22 

-41.28 

-41.33 

-41.39 

-41.44 

-41.50 

-41.56 

-41.61 

-43 

-41.67 

-41.72 

-41.78 

-41.83 

-41.89 

-41.94 

-42.00 

-42.0J6 

-42.11 

-42.17 

-44 

-42.22 

-42.28 

-42.33 

-42.39 

-42.44 

-42.50 

-42.56 

-42.61 

-42.67 

-42.72 

-45 

-42.78 

-42.83 

-42.89 

-42.94 

-43.00 

-43.06 

-43.11 

-43.17 

-43.22 

-43.28 

-46 

-43.33 

-43.39 

-43.44 

-43.50 

-43.56 

-43.61 

-43.67 

-43.72 

-43.78 

-43.83 

-47 

-43.89 

-4394 

-44.00 

-44.06 

-44.11 

-44.17 

-44.22 

-44.28 

-44.33 

-44.39 

-48 

-44.44 

-44.50 

-44.56 

-44.61 

-44.67 

-44.72 

-44.78 

-44.83 

-44.89 

-44.94 

-49 

-45.00 

-45.06 

-45.11 

-45.17 

-45.22 

-45.28 

-45.33 

-45.39 

-45.44 

-45.50 

-50 

-45.56 

-45.61 

-45.67 

-45.72 

-45.78 

-45.83 

-45.89 

-45.94 

-46.00 

-46.06 

-51 

-46.11 

-46.17 

-46.22 

-46.28 

-46.33 

-46.39 

-46.44 

-46.50 

-46.56 

-46.61 

-52 

-46.67 

-46.72 

-46.78 

-46.83 

-46.89 

-46.94 

-47.00 

-47.06 

-47.11 

-47.17 

-53 

-47.22 

-47.28 

-47.33 

-47.39 

-47.44 

-47.50 

-47.56 

-47.61 

-47.67 

-47.72 

-54 

-47.78 

-47.83 

-47.89 

-47.94 

-48.00 

-48.06 

-48.11 

-48.17 

-48.22 

-48.28 

—55 

-48.33 

-48.39 

-48.44 

-48.50 

-48.56 

-48.61 

-48.67 

-48.72 

-48.78 

-48.83 

-56 

-48.89 

-48.94 

-49.00 

-49.06 

-49.11 

-49.17 

-49.22 

-49.28 

-49.33 

-49.39 

-57 

-49.44 

-49.50 

-49.56 

-49.61 

-49.67 

-49.72 

-49.78 

-49.83 

-49.89 

-49.94 

-58 

-50.00 

-50.06 

-50.11 

-50.17 

-50.22 

-50.28 

-50.33 

-50.39 

-50.44 

-50.50 

-59 

-50.56 

-50.61 

-50.67 

-50.72 

-50.78 

-50.83 

-50.89 

-50.94 

-51.00 

-51.06 

-60 

-51.11 

-51.17 

-51.22 

-51.28 

-51.33 

-51.39 

-51.44 

-51.50 

-51.56 

-51.61 

-61 

-51.67 

-51.72 

-51.78 

-51.83 

-51.89 

-51.94 

-52.00 

-52.06 

-52.11 

-52.17 

-62 

-52.22 

-52.28 

-52.32 

-52.39 

-52.44 

-52.50 

-52.56 

-52.61 

-52.67 

-52.72 

-63 

-52.78 

-52.83 

-52.89 

-52.94 

-53.00 

-53.06 

-53.11 

-53.17 

-53.22 

-53.28 

-64 

-53.33 

-53.39 

-53.44 

-53.50 

-53.56 

-53.61 

-53.67 

-53.72 

-53.78 

-53.83 

-65 

-53.89 

-53.94 

-54.00 

-54.06 

-54.11 

-54.17 

-54.22 

-54.28 

-54.33 

-54.39 

-66 

-54.44 

-54.50 

-54.56 

-54.61 

-54.67 

-54.72 

-54.78 

-54.83 

-54.89 

-54.94 

-67 

-55.00 

-55.06 

-55.11 

-55.17 

-55.22 

-55.28 

-55.33 

-55.39 

-55.44 

-55.50 

-68 

-55.56 

-55.61 

-55.67 

-55.72 

-55.78 

-55.83 

-55.89 

-55.94 

-56.00 

-56.06 

-69 

-56.11 

-56.17 

-56.22 

-56.28 

-56.33 

-56.39 

-56.44 

-56.50 

-56.56 

-56.61 

-70 

-56.67 

-56.72 

-56.78 

-56.83 

-56.89 

-56.94 

-57.00 

-57.06 

-57.11 

-57.17 

-71 

-57.22 

-57.28 

-57.33 

-57.39 

-57.44 

-57.50 

-57.56 

-57.61 

-57.67 

-57.72 

-72 

-57.78 

-57.83 

-57.89 

-57.94 

-58.00 

-58.06 

-58.11 

-58.16 

-58.22 

-58.28 

-73 

-58.33 

-58.39 

-58.44 

-58.50 

-58.56 

-58.61 

-58.67 

-58.72 

-58.78 

-58.83 

-74 

-58.89 

-58.94 

-59.00 

-59.06 

-59.11 

-59.17 

-59.22 

-59.28 

-59.33 

-59.39 

-75 

-59.44 

-59.50 

-59.56 

-59.61 

-59.67 

-59.72 

-59.78 

-59.83 

-59.89 

-59.94 

-76 

-60.00 

-60.06 

-60.11 

-60.17 

-60.22 

-60.28 

-60.33 

-60.39 

-60.44 

-60.50 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

17 


V. 


CONVERSION  OF  DEGREES  OF  FAHRENHEIT  INTO  DEGREES  OF  REAUMUR. 


Tenths  of  a  Degree. 

Degrees  of 

Fahren- 

heit. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

p. 

9. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

+122 

+40.00 

+40.04 

+40.09 

+40.13 

+40.18 

+40.22 

+40.27 

+40.31 

+40.36 

+40.40 

121 

39.56 

39.60 

39.64 

39.69 

39.73 

39.78 

39.82 

39.87 

39.91 

39.96 

120 

39.11 

39.16 

39.20 

39.24 

39.29 

39.33 

39.38 

39.42 

39.47 

39.51 

119 

38.67 

38.71 

38.76 

38.80 

38.84 

38.89 

38.93 

38.98 

39.02 

39.07 

118 

38.22 

38.27 

38.31 

38.36 

38.40 

38.44 

38.49 

38.53 

38.58 

38.62 

117 

37.78 

37.82 

37.87 

37.91 

37.96 

38.00 

38.04 

38.09 

38.13 

38.18 

116 

37.33 

37.38 

37.42 

37.47 

37.51 

37.56 

37.60 

37.64 

37.69 

37.73 

115 

36.89 

36.93 

36.98 

37.02 

37.07 

37.11 

37.16 

37.20 

37.24 

37.29 

114 

36.44 

36.49 

36.53 

36.58 

36.62 

36.67 

36.71 

36.76 

36.80 

36.84 

113 

36.00 

36.04 

36.09 

36.13 

36.18 

36.22 

36.27 

36.31 

36.36 

36.40 

112 

35.56 

35.60 

35.64 

35.69 

35.73 

35.78 

35.82 

35.87 

35.91 

35.96 

111 

35.11 

35.16 

35.20 

35.24 

35.29 

35.33 

35.38 

35.42 

35.47 

35.51 

110 

34.67 

34.71 

34.76 

34.80 

34.84 

34.89 

34.93 

34.98 

35.02 

35.07 

109 

34.22 

34.27 

34.31 

34.36 

34.40 

34.44 

34.49 

34.53 

34.58 

34.62 

108 

33.78 

33.82 

33.87 

33.91 

33.96 

34.00 

34.04 

34.09 

34.13 

34.18 

107 

33.33 

33.38 

33.42 

33.47 

33.51 

33.56 

33.60 

33.64 

33.69 

33.73 

106 

32.89 

32.93 

32.98 

33.02 

33.07 

33.11 

33.16 

33.20 

33.24 

33.29 

105 

32.44 

32.49 

32.53 

32.58 

32.62 

32.67 

32.71 

32.76 

32.80 

32.84 

104 

.  32.00 

32.04 

32.09 

32.13 

32.18 

32.22 

32.27 

32.31 

32.36 

32.40 

103 

31.56 

31.60 

31.64 

31.69 

31.73 

31.78 

31.82 

31.87 

31.91 

31.96 

102 

31.11 

31.16 

31.20 

31.24 

31.29 

31.33 

31.38 

31.42 

31.47 

31.51 

101 

30.67 

30.71 

30.76 

30.80 

30.84 

30.89 

30.93 

30.98 

31.02 

31.07 

100 

30.22 

30.27 

30.31 

30.36 

30.40 

30.44 

30.49 

30.53 

30.58 

30.62 

99 

29.78 

29.82 

29.87 

29.91 

29.96 

30.00 

30.04 

30.09 

30.13 

30.18 

98 

29.33 

29.38 

29.42 

29.47 

29.51 

29.56 

29.60 

29.64 

29.69 

29.73 

97 

28.89 

28.93 

28.98 

29.02 

29.07 

29.11 

29.16 

29.20 

29.24 

29.29 

96 

28.44 

28.49 

28.53 

28.58 

28.62 

28.67 

28.71 

28.76 

28.80 

28.84 

95 

28.00 

28.04 

28.09 

28.13 

28.18 

28.22 

28.27 

28.31 

28.36 

28.40 

94 

27.56 

27.60 

27.64 

27.69 

27.73 

27.78 

27.82 

27.87 

27.91 

27.96 

93 

27.11 

27.16 

27.20 

27.24 

27.29 

27.33 

27.38 

27.42 

27.47 

27.51 

92 

26.67 

26.71 

26.76 

26.80 

26.84 

26.89 

26.93 

26.98 

27.02 

27.07 

91 

26.22 

26.27 

26.31 

26.36 

26.40 

26.44 

26.49 

26.53 

26.58 

26.62 

•     90 

25.78 

25.82 

25.87 

25.91 

35.96 

26.00 

26.04 

26.09 

26.13 

26.18 

89 

25.33 

25.38 

25.42 

25.47 

25.51 

25.56 

25.60 

25.64 

25.69 

25.73 

88 

24.89 

24.93 

24.98 

25.02 

25.07 

25.11 

25.16 

25.20 

25.24 

25.29 

87 

24.44 

24.49 

24.53 

24.58 

24.62 

24.67 

24.71 

24.76 

24.80 

24.84 

86 

24.00 

24.04 

24.09 

24.13 

24.18 

24.22 

24.27 

24.31 

24.36 

24.40 

85 

23.56 

23.60 

23.64 

23.69 

23.73 

23.78 

23.82 

23.87 

23.91 

23.96 

84 

23.11 

23.16 

23.20 

23.24 

23.29 

23.33 

23.38 

23.42 

23.47 

23.51 

83 

22.67 

22.71 

22.76 

22.80 

22.84 

22.89 

22.93 

22.98 

23.02 

23.07 

82 

22.22 

22.27 

22.31 

22.36 

22.40 

22.44 

22.49 

22.53 

22.58 

22.62 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

18 


CONVERSION  OF  DEGREES  OF  FAHRENHEIT  INTO  DEGREES  OF  REAUMUR. 


Tenths  of  a  Degree. 

Degrees  01 

Fahren- 

heit. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur 

Reaumur. 

Reaumur. 

+81 

+21.78 

+21.82 

+21.87 

+21.91 

+21.96 

+22.00 

+22.04 

+22.09 

+22.13 

+22.18 

80 

21.33 

21.38 

21.42 

21.47 

21.51 

21.56 

21.60 

21.64 

21.69 

21.73 

79 

20.89 

20.93 

20.98 

21.02 

21.07 

21.11 

21.16 

21.20 

21.24 

21.29 

78 

20-44 

20.49 

20.53 

20.58 

20.62 

20.67 

20.71 

20.76 

20.80 

20.84 

77 

20.00 

20.04 

20.09 

20.13 

20.18 

20.22 

20.27 

20.31 

20.36 

20.40 

76 

19.56 

19.60 

19.64 

19.69 

19.73 

19.78 

19.82 

19.87 

19.91 

19.96 

75 

19.11 

19.16 

19.20 

19.24 

19-29 

19.33 

19.38 

19.42 

19.47 

19.51 

74 

18.67 

18.71 

18.76 

18.80 

1884 

18.89 

18.93 

18.98 

19.02 

19.07 

73 

18.22 

18.27 

18.31 

18.36 

18.40 

18.44 

18.49 

18.53 

18.58 

18.62 

72 

17.78 

17.82 

17.87 

17.91 

17.96 

18-00 

18.04 

18.09 

18.13 

18.18 

71 

17.33 

17.38 

17.42 

17.47 

17.51 

17.56 

17.60 

17.64 

17.69 

17.73 

70 

16.89 

16.93 

16.98 

17.02 

17.07 

17.11 

17.16 

17.20 

17.24 

17.29 

69 

16.44 

16.49 

16.53 

16.58 

16.62 

16.67 

16.71 

16.76 

16.80 

16.84 

68 

16.00 

16.04 

16.09 

16.13 

16.18 

16.22 

16.27 

16.31 

16.36 

16.40 

67 

15.56 

15.60 

15.64 

15.69 

15.73 

15.78 

15.82 

15.87 

15.91 

15.96 

66 

15.11 

15.16 

15.20 

15.24 

15.29 

15.33 

15.38 

15.42 

15.47 

15.51 

65 

14.67 

14.71 

14.76 

14.80 

14.84 

14.89 

14.93 

14.98 

15.02 

15.07 

64 

14.22 

14.27 

14.31 

14.36 

14.40 

14.44 

14.49 

14.53 

14.58 

14.62 

63 

13.78 

13.82 

13.87 

13.91 

13.96 

14.00 

14.04 

14.09 

14.13 

14.18 

62 

13.33 

13.38 

13.42 

13.47 

13.51 

13.56 

13.60 

13.64 

13.69 

13.73 

61 

12.89 

12.93 

12.98 

13.02 

13.07 

13.11 

13.16 

13.20 

13.24 

13.29 

60 

12.44 

12.49 

12.53 

12.58 

12.62 

12.67 

12.71 

12.76 

12.80 

12.84 

59 

12.00 

12.04 

12.09 

12.13 

12.18 

12.22 

12.27 

12.31 

12.36 

12.40 

58 

11.56 

11.60 

11.64 

11.69 

11.73 

11.78 

11.82 

11.87 

11.91 

11.96 

57 

11.11 

11.16 

11.20 

11.24 

11.29 

11.33 

11.38 

11.42 

11.47 

11.51 

56 

10.67 

10.71 

10.76 

10.80 

10.84 

10.89 

10.93 

10.98 

11.02 

11.07 

55 

10.22 

10.27 

10.31 

10.36 

10.40 

10.44 

10.49 

10.53 

10.58 

10.62 

54 

9.78 

9.82 

9.87 

9.91 

9.96 

10.00 

10.04 

10.09 

10.13 

10.18 

53 

9.33 

9.38 

9.42 

9.47 

9.51 

9.56 

9.60 

9.64 

9.69 

9.73 

52 

8.89 

8.93 

8.98 

9.02 

9.07 

9.11 

9.16 

9.20 

9.24 

9.29 

51 

8.44 

8.49 

8.53 

8.58 

8.62 

8.67 

8.71 

8.76 

8.80 

8.84 

50 

8.00 

8.04 

8.09 

8.13 

8.18 

8.22 

8.27 

8.31 

8.36 

8.40 

49 

7.56 

7.60 

7.64 

7.69 

7.73 

7.78 

7.82 

7.87 

7.91 

7.96 

48 

7.11 

7.16 

7.20 

7.24 

7.29 

7.33 

7.38 

7.42 

7.47 

7.51 

47 

6.67 

6.71 

6.76 

6.80 

6.84 

6.89 

6.93 

6.98 

7.02 

7.07 

46 

6.22 

6.27 

6.31 

6.36 

6.40 

6.44 

6.49 

6.53 

6.58 

6.62 

45 

5.78 

5.82 

5.87 

5.91 

5.96 

6.00 

6.04 

6.09  ' 

6.13 

6.18 

44 

5.33 

5.38 

5.42 

5.47 

5.51 

5.56 

5.60 

5.64 

5.69 

5.73 

43 

4.89 

4.93 

4.98 

5.02 

5.07 

5.11 

5.16 

5.20 

5.24 

5.29 

42 

4.44 

4.49 

4.53 

4.58 

4.62 

4.67 

4.71 

4.76 

4.80 

4.84 

41 

4.00 

4.04 

4.09 

4.13 

4.18 

4.22 

4.27 

4.31 

4.36 

4.40 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

19 


CONVERSION  OF  DEGREES  OF  FAHRENHEIT  INTO  DEGREES  OF  REAUMUR. 


Degrees  of 

Tenths  of  a  Degree. 

Fahren- 
heit. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

Reaumur. 

+40 

+  3.56 

+  3.60 

+  3.64 

+  3.69 

+  3.73 

+  3.78 

+  3.82 

+  3.87 

+  3.91 

+  3.96 

39 

3.11 

3.16 

3.20 

3.24 

3.29 

3.33 

3.38 

3.42 

3.47 

3.51 

38 

2.67 

2.71 

2.76 

2.80 

2.84 

2.89 

2.93 

2.98 

3.02 

3.07 

.     37 

2.22 

2.27 

2.31 

2.36 

2.40 

2.44 

2.49 

2.53 

2.58 

2.62 

36 

1.78 

1.82 

1.87 

1.91 

1.96 

2.00 

2.04 

2.09 

2.13 

2.18 

35 

1.33 

1.38 

1.42 

1.47 

1.51 

1.56 

1.60 

1.64 

1.69 

1.73 

34 

0.89 

0.93 

0.98 

1.02 

1.07 

1.11 

1.16 

1.20 

1.24 

1.29 

33 

0.44 

0.49 

0.53 

0.58 

0.62 

0.67 

0.71 

0.76 

0.80 

0.84 

32 

0.00 

0.04 

0.09 

0.13 

0.18 

0.22 

0.27 

0.31 

0.36 

0.40 

31 

-  0.44 

-  0.40 

-  0.36 

-  0.31 

-  0.27 

-  0.22 

-  0.18 

-  0.13 

-  0.09 

-  0.04 

30 

-  0.89 

-  0.84 

-  0.80 

-  0.76 

-  0.71 

-  0.67 

-  0.62 

-  0.58 

-  0.53 

-  0.49 

29 

-  1.33 

-  1.29 

-  1.24 

-  1.20 

-  1.16 

-  1.11 

-  1.07 

-  1.02 

-  0.98 

-  0.93 

28 

-  1.78 

-  1.73 

-  1.69 

-  1.64 

-  1.60 

-  1.56 

-  1.51 

-  1.47 

-  1.42 

-  1.38 

27 

-  2.22 

-  2.18 

-  2.13 

-  2.09 

-  2.04 

-  2.00 

-  1.96 

-  1.91 

-  1.87 

-  1.82 

26 

-  2.67 

-  2.62 

-  2.58 

-  2.53 

-  2.49 

-  2.44 

-  2.40 

-  2.36 

-  2.31 

-  2.27 

25 

-  3.11 

-  3.07 

-  3.02 

-  2.98 

-  2.93 

-  2.89 

-  2.84 

-  2.80 

-  2.76 

-  2.71 

24 

-  3.56 

-  3.51 

-  3.47 

-  3.42 

-  3.38 

-  3.33 

-  3.29 

-  3.24 

-  3.20 

-  3.16 

23 

-  4.00 

-  3.96 

-  3.91 

-  3.87 

-  3.82 

-  3.78 

-  3.73 

-  3.69 

-  3.64 

-  3.60 

22 

-  4.44 

-  4.40 

-  4.36 

-  4.31 

-  4.27 

-  4.22 

-  4.18 

-  4.13 

-  4.09 

-  4.04 

21 

-  4.89 

-  4.84 

-  4.80 

-  4.76 

-  4.71 

-  4.67 

-  4.62 

-  4.58 

-  4.53 

-  4.49 

20 

-  5.33 

-  5.29 

-  5.24 

-  5.20 

-  5.16 

-  5.11 

-  5.07 

-  5.02 

-  4.98 

-  4.93 

19 

-  5.78 

-  5.73 

-  5.69 

-  5.64 

-  5.60 

-  5.56 

-  5.51 

-  5.47 

-  5.42 

-  5.38 

18 

-  6.22 

-  6.18 

-  6.13 

-  6.09 

-  6.04 

-  6.00 

-  5.96 

-  5.91 

-  5.87 

-  5.82 

17 

-  6.67 

-  6.62 

-  6.58 

-  6.53 

-  6.49 

-  6.44 

-  6.40 

-  6.36 

-  6.31 

-  6.27 

16 

-  7.11 

-  7.07 

-  7.02 

-  6.98 

-  6.93 

-  6.89 

-  6.84 

-  6.80 

-  6.76 

-  6.71 

15 

-  7.56 

-  7.51 

-  7.47 

-  7.42 

-  7.38 

-  7.33 

-  7.29 

-  7.24 

-  7.20 

-  7.16 

14 

-  8.00 

-  7.96 

-  7.91 

-  7.87 

-  7.82 

-^7.78 

-  7.73 

-  7.69 

-  7.64 

-  7.60 

13 

-  8.44 

-  8.40 

-  8.36 

-  8.31 

-  8.27 

-  8.22 

-  8^.18 

-  8.13 

-  8.09 

-  8.04 

12 

-  8.89 

-  8.84 

-  8.80 

-  8.76 

-  8.71 

-  8.67 

-  8.62 

-  8.58 

-  8.53 

-  8.49 

11 

-  9.33 

-  9.29 

-  9.24 

-  9.20 

-  9.16 

-  9.11 

-  9.07 

-  9.02 

-  8.98 

-  8.93 

10 

-  9.78 

-  9.73 

-  9.69 

-  9.64 

-  9.60 

-  9.56 

-  9.51 

-  9.47 

-  9.42 

-  9.38 

9 

-10.22 

-10.18 

-10.13 

-10.09 

-10.04 

-10.00 

-  9.96 

-  9.91 

-  9.87 

-  9.82 

8 

-10.67 

-10.62 

-10.58 

-10.53 

-10.49 

-10.44 

-10.40 

-10.36 

-10.31 

-10.27 

7 

-11.11 

-11.07 

-11.02 

-10.98 

-10.93 

-10.89 

-10.84 

-10.80 

-10.76 

-10.71 

6 

-11.56 

-11.51 

-11.47 

-11.42 

-11.38 

-11.33 

-11.29 

-11.24 

-11.20 

-11.16 

5 

-12.00 

-11.96 

-11.91 

-11.87 

-11.82 

-11.78 

-11.73 

-11.69 

-11.64 

-11.60 

4 

-12.44 

-12.40 

-12.36 

-12.31 

-12.27 

-12.22 

-12.18 

-12.13 

-12.09 

-12.04 

3 

-12.89 

-12.84 

-12.80 

-12.76 

-12.71 

-12.67 

-12.62 

-12.58 

-12.53 

-12.49 

2 

-13.33 

-13.29 

-13.24 

-13.20 

-13.16 

-13.11 

-13.07 

-12.02 

-12.98 

-12.93 

1 

-13.78 

-13.73 

-13.69 

-13.64 

-13.60 

-13.56 

-13.51 

-13.47 

-13.42 

-13.38 

+  0 

-14.22 

-14.18 

-14.13 

-14.09 

-14.04 

-14.00 

-13.96 

-13.91 

-13.87 

-13.82 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

20 


CONVERSION  OF  DEGREES  OF  FAHRENHEIT  INTO  DEGREES  OF  REAUMUR. 


Degrees  of 

Tenths  of  a  Degree. 

Fahren- 

heit. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

-  0 

Reaumur. 
-14.22 

Reaumur. 
-14.27 

Reaumur. 
-14.31 

Reaumur. 
-14.36 

Reaumur. 
-14.40 

Reaumur. 
-14.44 

Reaumur. 
-14.49 

Reaumur. 
-14.53 

Reaumur. 
-14.58 

Reaumur. 
-14.62 

-  1 

-14.67 

-14.71 

-14.76 

-14.80 

-14.84 

-14.89 

-14.93 

-14.98 

-15.02 

-15.07 

-  2 

-15.11 

-15.16 

-15.20 

-15.24 

-15.29 

-15.33 

-15.38 

-15.42 

-15.47 

-15.51 

-  3 

-15.56 

-15.60 

-15.64 

-15.69 

-15.73 

-15.78 

-15.82 

-15.87 

-15.91 

-15.96 

-  4 

-16.00 

-16.04 

-16.09 

-16.13 

-16.18 

-16.22 

-16.27 

-16.31 

-16-36 

-16.40 

-  5 

-16.44 

-16.49 

-16.53 

-16.58 

-16.62 

-16.67 

-16.71 

-16.76 

-16.80 

-16.84 

-  6 

-16.89 

-17.93 

-16.98 

-17.02 

-17.07 

-17.11 

-,17.16 

-17.20 

-17.24 

-17.29 

-  7 

-17.33 

-17.38 

-17.42 

-17.47 

-17.51 

-17.56 

-17.60 

-17.64 

-17.69 

-17.73 

-  8 

-17.78 

-18.82 

-17,87 

-17.91 

-17.96 

-18.00 

-18.04 

-18.09 

-18.13 

-18.18 

-  9 

-18.22 

-18.27 

-18.31 

-18.36 

-18.40 

-18.44 

-18.49 

-18.53 

-18.58 

-18.62 

-10 

-18.67 

-18.71 

-18.76 

-18.80 

-18.84 

-18.89 

-18.93 

-18.98 

-19.02 

-19.07 

-11 

-19.11 

-19.16 

-19.20 

-19.24 

-19.29 

-19.33 

-19.38 

-19.42 

-19.47 

-19.51 

-12 

-19.56 

-19.60 

-19.64 

-19.69 

-19.73 

-19.78 

-19.82 

-19.87 

-19.91 

-19.96 

-13 

-20.00 

-20.04 

-20.09 

-20.13 

-20.18 

-20.22 

-20.27 

-20.31 

-20.36 

-20.40 

-14 

-20.44 

-20.49 

-20.53 

-20.58 

-20.62 

-20.67 

-20.71 

-20.76 

-20.80 

-20.84 

-15 

-20.89 

-20.93 

-20.98 

-21.02 

-21.07 

-21.11 

-21.16 

-21.20 

-21.24 

-21.29 

-16 

-21.33 

-21.38 

-21.42 

-21.47 

-21.51 

-21.56 

-21.60 

-21.64 

-21.69 

-21.73 

-17 

-21.78 

-21.82 

-21.87 

-21.91 

-21.96 

-22.00 

-22.04 

-22.09 

-22.13 

-22.18 

-18 

-22.22 

-22.27 

-22.31 

-22.36 

-22.40 

-22.44 

-22.49 

-22.53 

-22.58 

-22.62 

-19 

-22.67 

-22.71 

-22.76 

-22.80 

-22.84 

-22.89 

-22.93 

-22.98 

-23.02 

-23.07 

-20 

-23.11 

-23.16 

-23.20 

-23.24 

-23.29 

-23.33 

-23.38 

-23.42 

-23.47 

-23.51 

-21 

-23.56 

-23.60 

-23.64 

-23.69 

-23.73 

-23.78 

-23.82 

-23.87 

-23.91 

-23.96 

-22 

-24.00 

-24.04 

-24.09 

-24.13 

-24.18 

-24.22 

-24.27 

-24.31 

-24.36 

-24.40 

-23 

-24.44 

-24.49 

-24.53 

-24.58 

-24.62 

-24.67 

-24.71 

-24.76 

-24.80 

-24.84 

-24 

-24.89 

-24.93 

-24.98 

-25.02 

-25.07 

-25.11 

-25.16 

-25.20 

-25.24 

-25.29 

-25 

-25.33 

-25.38 

-25.42 

-25.47 

-25.51 

-25.56 

-25.60 

-25.64 

-25.69 

-25.73 

-26 

-25.78 

-25.82 

-25.87 

-25.91 

-25.96 

-26.00 

-26.04 

-26.09 

-26.13 

-26.18 

-27 

-26.22 

-26.27 

-26.31 

-26.36 

-26.40 

-26.44 

-26.49 

-26.53 

-26.58 

-26.62 

-28 

-26.67 

-26.71 

-26.76 

-26.80 

-26.84 

-26.89 

-26.93 

-26.98 

-27.02 

-27.07 

-29 

-27.11 

-27.16 

-27.20 

-27.24 

-27.29 

-27.33 

-27.38 

-27.42 

-27.47 

-27.51 

-30 

-27.56 

-27.60 

-27.64 

-27.69 

-27.73 

-27.78 

-27.82 

-27.87 

-27.91 

-27.96 

-31 

-28.00 

-28.04 

-28.09 

-28.13 

-28.18 

-28.22 

-28.27 

-28.31 

-28.36 

-28.40 

-32 

-28.44 

-28.49 

-28.53 

-28.58 

-28.62 

-28.67 

-28.71 

-28.76 

-28.80 

-28.84 

-33 

-28.89 

-28.93 

-28.98 

-29.02 

-29.07 

-29.11 

-29.16 

-29.20 

-29.24 

-29.29 

-34 

-29.33 

-29.38 

-29.42 

-29.47 

-29.51 

-29.56 

-29.60 

-29.64 

-29.69 

-29-73 

-35 

-29.78 

-29.82 

-29.87 

-29.91 

-29.96 

-30.00 

-30.04 

-30.09 

-30.13 

-30-18 

-36 

-30.22 

-30.27 

-30.31 

-30.36 

-30.40 

-30.44 

-30.49 

-30.53 

-30.58 

-30.62 

-37 

-30.67 

-30.71 

-30.76 

-30.80 

-30.84 

-30.89 

-30.93 

-30-98 

-31.02 

-31.07 

-38 

-31.11 

-31.16 

-31.20 

-31.24 

-31.29 

-31.33 

-31.38 

-31.42 

-31.47 

-31-51 

-39 

-31.56 

-31.60 

-31.64 

-31.69 

-31.73 

-31.78 

-31.82 

-31.87 

-31.91 

-31.96 

-40 

-32.00 

-30.04 

-30.09 

-30.13 

-30.18 

-30.22 

-30.27 

-30.31 

-30.36 

-30.40 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

21 


VI. -VII, 

COMPARISON 


OP 


THE  CENTIGRADE  THERMOMETER 


WITH 


THE  THERMOMETERS  OF   FAHRENHEIT  AND  OF  REAUMUR, 


OR 


TABLES 


FOR  CONVERTING  CENTIGRADE  DEGREES  INTO  DEGREES  OF  FAHRENHEIT 

AND  OF  REAUMUR  J 

GIVING  THE  CORRESPONDING  VALUES  FOR  EACH  TENTH  OP  A  DEGREE, 
FROM  +50°  TO  — 54°  CENTIGRADE. 


23 


VI.      CONVERSION    OF    CENTIGRADE    DEGREES    INTO    DEGREES    OF   FAHRENHEIT, 


Tenths  of  Degrees. 

Centigrade 
Degrees. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

+50 

+122.00 

+122.18 

+122.36 

+122.54 

+122.72 

+122.90 

+123.08 

+123.26 

+123.44 

+123.62 

49 

120.20 

120.38 

120.56 

120.74 

120.92 

121.10 

121.28 

121.46 

121.64 

121.82 

48 

118.40 

118.58 

118.76 

118.94 

119.12 

119.30 

119.48 

119.66 

119.84 

120.02 

47 

116.60 

116.78 

116.96 

117.14 

117.32 

117.50 

117.68 

117.86 

118.04 

118.22 

46 

114.80 

114.98 

115.16 

115.34 

115.52 

115.70 

115.88 

116.06 

116.24 

116.42 

45 

113.00 

113.18 

113.36 

113.54 

113.72 

113.90 

114.08 

114.26 

114.44 

114.62 

44 

111.20 

111.38 

111.56 

111.74 

111.92 

112.10 

112.28 

112.46 

112.64 

112.82 

43 

109.40 

109.58 

109.76 

109.94 

110.12 

110.30 

110.48 

110.66 

110.84 

111.02 

42 

107.60 

107.78 

107.96 

108.14 

108.32 

108.50 

108.68 

108.86 

109.04 

109.22 

41 

105.80 

105.98 

106.16 

106.34 

106.52 

106.70 

106.88 

107.06 

107.24 

107.42 

40 

104.00 

104.18 

104.36 

104.54 

104.72 

104.90 

105.08 

105.26 

105.44 

105.62  1 

39 

102.20 

102.38 

102.56 

102.74 

102.92 

103.10 

103.28 

103.46 

103.64 

103.82 

38 

100.40 

100.58 

100.76 

100.94 

101.12 

101.30 

101.48 

101.66 

101.84 

102.02 

37 

98.60 

98.78 

98.96 

99.14 

99.32 

99.50 

99.68 

99.86 

100.04 

100.22 

36 

96.80 

96.98 

97.16 

97.34 

97.52 

97.70 

97.88 

98.06 

98.24 

98.42 

35 

95.00 

95.18 

95.36 

95.54 

95.72 

95.90 

96.08 

96.26 

96.44 

96.62 

34 

93.20 

93.38 

93.56 

93.74 

93.92 

94.10 

94.28 

94.46 

94.64 

94.82 

33 

91.40 

91.58 

91.76 

91.94 

92.12 

92.30 

92.48 

92.66 

92.84 

93.02 

32 

89.60 

89.78 

89.96 

90.14 

90.32 

90.50 

90.68 

90.86 

91.04 

91.22 

31 

87.80 

87.98 

88.16 

88.34 

88.52 

88.70 

88.88 

89.06 

89.24 

89.42 

30 

86.00 

86.18 

86.36 

86.54 

86.72 

86.90 

87.08 

87.26 

87.44 

87.62 

29 

84.20 

84.38 

84.56 

84.74 

84.92 

85.10 

85.28 

85.46 

85.64 

85.82 

28 

82.40 

82.58 

82.76 

82.94 

83.12 

83.30 

83.48 

83.66 

83.84 

84.02 

27 

80.60 

80.78 

80.96 

•81.14 

81.32 

81.50 

81.68 

81.86 

82.04 

82.22 

26 

78.80 

78.98 

79.16 

79.34 

79.52 

79.70 

79.88 

80.06 

80.24 

80.42 

25 

77.00 

77.18 

77.36 

77.54 

77.72 

77.90 

78.08 

78.26 

78.44 

78.62 

24 

75.20 

75.38 

75.56 

75.74 

75.92 

76.10 

76.28 

76.46 

76.64 

76.82 

23 

73.40 

73.58 

73.76 

73.94 

74.12 

74.30 

74.48 

74.66 

74.84 

75.02 

22 

71.60 

71.78 

71.96 

72.14 

72.32 

72.50 

72.68 

72.86 

73.04 

73.22 

21 

69.80 

69.98 

70.16 

70.34 

70.52 

70.70 

70.88 

71.06 

71.24 

71.42 

20 

68.00 

68.18 

68.36 

68.54 

68.72 

68.90 

69.08 

69.26 

69.44 

69.62 

19 

66.20 

66.38 

66.56 

66.74 

66.92 

67.10 

67.28 

67.46 

67.64 

67.82 

18 

64.40 

64.58 

64.76 

64.94 

65.12 

65.30 

65.48 

65.66 

65.84 

66.02 

17 

62.60 

62.78 

62.96 

63.14 

63.32 

63.50 

63.68 

63.86 

64.04 

64.22 

16 

60.80 

60.98 

61.16 

61.34 

61.52 

61.70 

61.88 

62.06 

62.24 

62.42 

15 

59.00 

59.18 

59.36 

59.54 

59.72 

59.90 

60.08 

60.26 

60.44 

60.62 

14 

57.20 

57.38 

57.56 

57.74 

57.92 

58.10 

58.28 

58.46 

58.64 

58.82 

13 

55.40 

55.58 

55.76 

55.94 

56.12 

56.30 

56.48 

56.66 

56.84 

57.02 

12 

53.60 

53.78 

53.96 

54.14 

54.32 

54.50 

54.68 

54.86 

55.04 

55.22 

11 

51.80 

51.98 

52.16 

52.34 

52.52 

52.70 

52.88 

53.06 

53.24 

53.42 

0. 

1. 

». 

3. 

4. 

5. 

6. 

•7. 

S. 

9. 

A                                                            25 

CONVERSION    OF    CENTIGRADE    DEGREES   INTO    DEGREES    OF    FAHRENHEIT. 


Centigrade 
Degrees. 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

i. 

8. 

9. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

+10 

+50.00 

+50.18 

+50.36 

+50.54 

+50.72 

+50.90 

+51.08 

+51.26 

+51.44 

+51.62 

9 

48.20 

48.38 

48.56 

48.74 

48.92 

49.10 

49.28 

49.46 

49.64 

49.82 

8 

46.40 

46.58 

46.76 

46.94 

47.12 

47.30 

47.48 

47.66 

47.84 

48.02 

7 

44.60 

44.78 

44.96 

45.14 

45.32 

45.50 

45.68 

45.86 

46.04 

46.22 

6 

42.80 

42.98 

43.16 

43.34 

43.52 

43.70 

43.88 

44.06 

44.24 

44.42 

5 

41.00 

41.18 

41.36 

41.54 

41.72 

41.90 

42.08 

42.26 

42.44 

42.62 

4 

39.20 

39.38 

39.56 

39.74 

39.92 

40.10 

40.28 

40.46 

40.64 

40.82 

3 

37.40 

37.58 

37.76 

37.94 

38.12 

38.30 

38.48 

38.66 

38.84 

39.02 

2 

35.60 

35.78 

35.96 

36.14 

36.32 

36.50 

36.68 

36.86 

37.04 

37.22 

1 

33.80 

33.98 

34.16 

34.34 

34.52 

34.70 

34.88 

35.06 

35.24 

35.42 

0 

32.00 

32.18 

32.36 

32.54 

32.72 

32.90 

33.08 

33.26 

33.44 

33.62 

-  0 

32.00 

31.82 

31.64 

31.46 

31.28 

31.10 

30.92 

30.74 

30.56 

30.38 

-  1 

30.20 

30.02 

29.84 

29.66 

29.48 

29.30 

29.12 

28.94 

28.76 

28.58 

-  2 

28.40 

28.22 

28.04 

27.86 

27.68 

27.50 

27.32 

27.14 

26.96 

26.78 

-  3 

26.60 

26.42 

26.24 

26.06 

25.88 

25.70 

25.52 

25.34 

25.16 

24.98 

-  4 

24.80 

24.62 

24.44 

24.26 

24.08 

23.90 

23.72 

23.54 

23.36 

23.18 

-  5 

23.00 

22.82 

22.64 

22.46 

22.28 

22.10 

21.92 

21.74 

21.56 

21.38 

-  6 

21.20 

21.02 

20.84 

20.66 

20.48 

20.30 

20.12 

19.94 

19.76 

19.58 

-  7 

19.40 

19.22 

19.04 

18.86 

18.68 

18.50 

18.32 

18.14 

17.96 

17.78 

-  8 

17.60 

17.42 

17.24 

17.06 

16.88 

16.70 

16.52 

16.34 

16.16 

15.98 

-  9 

15.80 

15.62 

15.44 

15.26 

15.08 

14.90 

14.72 

14.54 

14.36 

14.18 

-10 

14.00 

13.82 

13.64 

13.46 

13.28 

13.10 

12.92 

12.74 

12.56 

12.38 

-11 

12.20 

12.02 

11.84 

11.66 

11.48 

11.30 

11.12 

10.94 

10.76 

10.58 

-12 

10.40 

10.22 

10.04 

9.86 

9.68 

9.50 

9.32 

9.14 

8.96 

8.78 

-13 

8.60 

8.42 

8.24 

8.06 

7.88 

7.70 

7.52 

7.34 

7.16 

6.98 

-14 

6.80 

6.62 

6.44 

6.26 

6.08 

5.90 

5.72 

5.54 

5.36 

5.18 

-15 

5.00 

4.82 

4.64 

4.46 

4.28 

4.10 

3.92 

3.74 

3.56 

3.38 

-16 

3.20 

3.02 

2.84 

2.66 

2.48 

2.30 

2.12 

1.94 

1.76 

1.58 

-17 

1.40 

1.22 

1.04 

0.86 

0.68 

0.50 

0.32 

0.14 

-  0.04 

-  0.22 

-18 

-  0.40 

-  0.58 

-  0.76 

-  0.94 

-  1.12 

-  1.30 

-  1.48 

-  1.66 

-  1.84 

-  2.02 

-19 

-  2.20 

-  2.38 

-  2.56 

-  2.74 

-  2.92 

-  3.10 

-  3.28 

-  3.46 

-  3.64 

-  3.82 

-20 

-  4.00 

-  4.18 

-  4.36 

-  4.54 

-  4.72 

-  4.90 

-  5.08 

-  5.26 

-  5.44 

-  5.62 

-21 

-  5.80 

-  5.98 

-  6.16 

-  6.34 

-  6.52 

-  6.70 

-  6.88 

-  7.08 

-  7.24 

-  7.42 

-22 

-  7.60 

-  7.78 

-  7.96 

-  8.14 

-  8.32 

-  8.50 

-  8.68 

-  8.86 

-  9.04 

-  9.22 

-23 

-  9.40 

-  9.58 

-  9.76 

-  9.94 

-10.12 

-10.30 

-10.48 

-10.66 

-10.84 

-11.02 

-24 

-11.20 

-11.38 

-11.56 

-11.74 

-11.92 

-12.10 

-12.28 

-12.46 

-12.64 

-12.82 

-25  m 

-13.00 

-13.18 

-13.36 

-13.54 

-13.72 

-13.90' 

-14.08 

-14.26 

-14.44 

-14.62 

-26  * 

-14.80 

-14.98 

-15.16 

-15.34 

-15.52 

-15.70 

-15.88 

-16.06 

-16.24 

-16.42 

-27 

-16.60 

-16.78 

-16.96 

-17.14 

-17.32 

-17.50 

-17.68 

-17.86 

-18.04 

-18.22 

-28 

-18.40 

-18.58 

-18.76 

-18.94 

-19.12 

-19.30 

-19.48 

-19.66 

-19.84 

-20.02 

-29 

-20.20 

-20.38 

-20.56 

-20.74 

-20.92 

-21.10 

-21.28 

-21.46 

-21.64 

-21.82 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

CONVERSION    OF    CENTIGRADE    DEGREES    INTO    DEGREES   OF   FAHRENHEIT. 


- 

Tenths  of  Degrees. 

Centigrade 
Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

-30 

-22.00 

-22.18 

-22.36 

-22.54 

-22.72 

-22.90 

-23.08 

-23.26 

-23.44 

-23.62 

-31 

-23.80 

-23.98 

-24.16 

-24.34 

-24.52 

-24.70 

-24.88 

-25.06 

-25.24 

-25.42 

-32 

-25.60 

-25.78 

-25.96 

-26.14 

-26.32 

-26.50 

-26.68 

-26.86 

-27.04 

-27.22 

-33 

-27.40 

-27.58 

-27.76 

-27.94 

-28.12 

-28.30 

-28.48 

-28.66 

-28.84 

-29.02 

-34 

-29.20 

-29.38 

-29.56 

-29.74 

-29.92 

-30.10 

-30.28 

-30.46 

-30.64 

-30.82 

-35 

-31.00 

-31.18 

-31.36 

-31.54 

-31.72 

-31.90 

-32.08 

-32.26 

-32.44 

-32.62 

-36 

-32.80 

-32.98 

-33.16 

-33.34 

-33.52 

-33.70 

-33.88 

-34.06 

-34.24 

-34.42 

-37 

-34.60 

-34.78 

-34.96 

-35.14 

-35.32 

-35.50 

-35.68 

-35.86 

-36.04 

-36.22 

-38 

-36.40 

-36.58 

-36.76 

-36.94 

-37.12 

-37.30 

-37.48 

-37.66 

-37.84 

-38.02 

-39 

-38.20 

-38.38 

-38.56 

-38.74 

-38.92 

-39.10 

-39.28 

-39.46 

-39.64 

-39.82 

-40 

-40.00 

-40.18 

-40.36 

-40.54 

-40.72 

-40.90 

-41.08 

-41.26 

-41.44 

-41.62 

-41 

-41.80 

-41.98 

-42.16 

-42.34 

-42.52 

-42.70 

-42.88 

-43.06 

-43.24 

-43.42 

-42 

-43.60 

-43.78 

-43.96 

-44.14 

-44.32 

-44.50 

-44.68 

-44.86 

-45.04 

-45.22 

-43 

-45.40 

-45.58 

-45.76 

-45.94 

-46.12 

-46.30 

-46.48 

-46.66 

-46.84 

-47.02 

-44 

-47.20 

-47.38 

-47.56 

-47.74 

-47.92 

-48.10 

-48.28 

-48.46 

-48.64 

-48.82 

-45 

-49.00 

-49.18 

-49.36 

-49.54 

-49.72 

-49.90 

-50.08 

-50.26 

-50.44 

-50.62 

-46 

-50.80 

-50.98 

-51.16 

-51.34 

-51.52 

-51.70 

-51.88 

-52.06 

-52.24 

-52.42 

-47 

-52.60 

-52.78 

-52.96 

-53.14 

-53.32 

-53.50 

-53.68 

-53.86 

-54.04 

-54.22 

-48 

-54.40 

-54.58 

-54,76 

-54.94 

-55.12 

-55.30 

-55.48 

-55.66 

-55.84 

-56.02 

-49 

-56.20 

-56.38 

-56.56 

-56.74 

-56.92 

-57.10 

-57.28 

-57.46 

-57.64 

-57.82 

-50 

-58.00 

-58.18 

-58.36 

-58.54 

-58.72 

-58.90 

-59.08 

-59.26 

-59.44 

-59.62 

-51 

-59.80 

-59.98 

-60.16 

-60.34 

-60.52 

-60.70 

-60.88 

-61.06 

-61.24 

-61.42 

-52 

-61.60 

-61.78 

-61.96 

-62.14 

-62.32 

-62.50 

-62.68 

-62.86 

-63.04 

-63.22 

-53 

-63.40 

-63.58 

-63.76 

-63.94 

-64.12 

-64.30 

-64.48 

-64.66 

-64.84 

-65.02 

-54 

-65.20 

-65.38 

-65.56 

-65.74 

-65.92 

-66.10 

-66.28 

-66.46 

-66.64 

-66.82 

TABLE   FOR   COMPARING  THE   CENTIGRADE  AND   FAHRENHEIT'S   THERMOMETERS   NEAR 

THE   BOILING   POINT. 

Centigrade 
Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

S. 

9. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

100 

212.00 

212.18 

212.36 

212.54 

212.72 

212.90 

213.08 

213.26 

213.44 

213.62 

99 

210.20 

210.38 

210.56 

210.74 

210.92 

211.10 

211.28 

211.46 

211.64 

211.82 

98 

208.40 

208.58 

208.76 

208.94 

209.12 

209.30 

209.48 

209.66 

209.84 

210.02 

97 

206.60 

206.78 

206.96 

207.14 

207.32 

207.50 

207.68 

207.86 

208.04 

208.22 

96 

204.80 

204.98 

205.16. 

205.34 

205.52 

205.70 

205.88 

206.06 

206.24 

206.42 

95 

203.00 

203.18 

203.36 

203.54 

203.72 

203.90 

204.08 

204.26 

204.44 

204.62 

94 

201.20 

201.38 

201.56 

201.74 

201.92 

202.10 

202.28 

202.46 

202.64 

202.82 

93 

199.40 

199.58 

199.76 

199.94 

200.12 

200.30 

200.48 

200.66 

200.84 

201.02 

92 

197.60 

197.78 

197.96 

198.14 

198.32 

198.50 

198.68 

198.86 

199.04 

199.22 

91 

195.80 

195.98 

196.16 

196.34 

196.52 

196.70 

196.88 

197.06 

197.24 

197.42 

90 

194.00 

194.18 

194.36 

194.54 

194.72 

194.90 

195.08 

195.26 

195-.44 

195.62 

89 

192.20 

192.38 

192.56 

192.74 

192.92 

193.10 

193.28 

193.46 

193.64 

193.82 

A 


VII.       CONVERSION    OF    CENTIGRADE    DEGREES   INTO    DEGREES    OF    REAUMUR. 


Tenths  of  Degrees. 

Centigrade 
Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

Reaum. 

Reaum. 

Reaum. 

Reaum. 

Reaum. 

Reaum. 

Reaum. 

Reaum. 

Reaum. 

Reaum. 

+40 

+32.00 

±32.08 

+32.16 

±32.24 

±32.32 

±32.40 

±32.48 

±32.56 

±32.64 

±32.72 

39 

31.20 

31.28 

31.36 

31.44 

31.52 

31.60 

31.68 

31.76 

31.84 

31.92 

38 

30.40 

30.48 

30.56 

30.64 

30.72 

30.80 

30.88 

30.96 

31.04 

31.12 

37 

29.60 

29.68 

29.76 

29.84 

29.92 

30.00 

30.08 

30.16 

30.24 

30.32 

36 

28.80 

28.88 

28.96 

29.04 

29.12 

29.20 

29.28 

29.36 

29.44 

29.52 

35 

28.00 

28.08 

28.16 

28.24 

28.32 

28.40 

28.48 

28.56 

28.64 

28.72 

34 

27.20 

27.28 

27.36 

27.44 

27.52 

27.60 

27.68 

27.76 

27.84 

27.92 

33 

26.40 

26.48 

26.56 

26.64 

26.72 

26.80 

26.88 

26.96 

27.04 

27.12 

32 

25.60 

25.68 

25.76 

25.84 

25.92 

26.00 

26.08 

26.16 

26.24 

26.32 

31 

24.80 

24.88 

24.96 

25.04 

25.12 

25.20 

25.28 

25.36 

25.4d 

25.52 

30 

24.00 

24.08 

24.16 

24.24 

25.32 

24.40 

24.48 

24.56 

24.64 

24.72 

29 

23.20 

23.28 

23.36 

23.44 

23.52 

23.60 

23.68 

23.76 

23.84 

23.92 

28 

22.40 

22.48 

22.56 

22.64 

22.72 

22.80 

22.88 

22.96 

23.04 

23.12 

27 

21.60 

21.68 

21.76 

21.84 

21.92 

22.00 

22.08 

22.16 

22.24 

22.32 

26 

20.80 

20.88 

20.96 

21.04 

21.12 

21.20 

21.28 

21.36 

21.44 

21.52 

25 

20.00 

20.08 

20.16 

20.24 

20.32 

20.40 

20.48 

20.56 

20.64 

20.72 

24 

19.20 

19.28 

19.36 

19.44 

19.52 

19.60 

19.68 

19.76 

19.84 

19.92 

23 

18.40 

18.48 

18.56 

18.64 

18.72 

18.80 

18.88 

18.96 

19.04 

19.12 

22 

17.60 

17.68 

17.76 

17.84 

17.92 

18.00 

18.08 

18.16 

18.24 

18.32 

21 

16.80 

16.88 

16.96 

17.04 

17.12 

17.20 

17.28 

17.36 

17.44 

17.52 

20 

16.00 

16.08 

16.16 

16.24 

16.32 

16.40 

16.48 

16.56 

16.64 

16.72 

19 

15.20 

15.28 

15.36 

15.44 

15.52 

15.60 

15.68 

15.76 

15.84 

15.92 

18 

14.40 

14.48 

14.56 

14.64 

14.72 

14.80 

14.88 

14.96 

15.04 

15.12 

17 

13.60 

13.68 

13.76 

13.84 

13.92 

14.00 

14.08 

14.16 

14.24 

14.32 

16 

12.80 

12.88 

12.96 

13.04 

13.12 

13.20 

13.28 

13.36 

13.44 

13.52 

15 

12.00 

12.08 

12.16 

12.24 

12.32 

12.40 

12.48 

12.56 

12.64 

12.72 

14 

11.20 

11.28 

11.36 

11.44 

11.52 

11.60 

11.68 

11.76 

11.84 

11.92 

13 

10.40 

10.48 

10.56 

10.64 

10.72 

lO.'sO 

10.88 

10.96 

11.04 

11.12 

12 

9.60 

9.68 

9.76 

9.84 

9.92 

10.00 

10.08 

10.16 

10.24 

10.32 

11 

8.80 

8.88 

8.96 

9.04 

9.12 

9.20 

9.28 

9.36 

9.44 

9.52 

10 

8.00 

8.08 

8.16 

8.24 

8.32 

8.40 

8.48 

8.56 

8.64 

8.72 

9 

7.20 

7.28 

7.36 

7.44 

7.52 

7.60 

7.68 

7.76 

7.84 

7.92 

8 

6.40 

6.48 

6.56 

6.64 

6.72 

6.80 

6.88 

6.96 

7.04 

7.12 

7 

5.60 

5.68 

5.76 

5.84 

5.92 

6.00 

6.08 

6.16 

6.24 

6.32 

6 

4.80 

4.88 

4.96 

5.04 

5.12 

5.20 

5.28 

5.36 

5.44 

5.52 

5 

4.00 

4.08 

4.16 

4.24 

4.32 

4.40 

4.48 

4.56 

4.64 

4.72 

4 

3.20 

3.28 

3.36 

3.44 

3.52 

3.60 

3.68 

3.76 

3.84 

3.92 

3 

2.40 

2.48 

2.56 

2.64 

2.72 

2.80 

2.88 

2.96 

3.04 

3.12 

2 

1.60 

1.68 

1.76 

1.84 

1.92 

2.00 

2.08 

2.16 

2.24 

2.32 

1 

0.80 

0.88 

0.96 

1.04 

1.12 

1.20 

1.28 

1.36 

1.44 

1.52 

o 

o 

o 

0 

o 

o 

o 

o 

o 

o 

o 

0 

0.00 

0.08 

0.16 

0.24 

0.32 

0.40 

0.48 

0.56 

0.64 

0.72 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

VIII. -IX. 

COMPARISON 


OP 


REAUMUR'S    THERMOMETER 


WITH 


THE    THERMOMETER    OF    FAHRENHEIT    AND    THE 
CENTIGRADE    THERMOMETER, 


TABLES 

FOR  CONVERTING  DEGREES  OF  REAUMUR  INTO  DEGREES  OF  FAHRENHEIT 


GIVING  THE  CORRESPONDING  VALUES  FOR  EACH  TENTH  OP  A  DEGREE, 
FROM  +40°  TO  — 40°  REAUMUR. 


29 


VIII.    CONVERSION   OF    DEGREES    OF    REAUMUR    INTO    DEGREES    OF    FAHRENHEIT. 


Tenths  of  Degrees. 

Degrees  of 
Reaumur. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

+40 

+122.00 

+122.22 

+122.45 

+122.67 

+122.90 

+123.12 

+123.35 

+123.57 

+123.80 

+124.02 

39 

119.75 

119.97 

120.20 

120.42 

120.65 

120.87 

121.10 

121.32 

121.55 

121.77 

33 

117.50 

117.72 

117.95 

118.17 

118.40 

118.62 

118.85 

119.07 

119.30 

119.52 

37 

115.25 

115.47 

115.70 

115.92 

116.15 

116.37 

116.60 

116.82 

117.05 

117.27 

36 

113.00 

113.22 

113.45 

113.67 

113.90 

114.12 

114.35 

114.57 

114.80 

115.02 

35 

110.75 

110.97 

111.20 

111.42 

111.65 

111.87 

112.10 

112.32 

112.55 

112.77 

34 

108.50 

108.72 

108.95 

109.17 

109.40 

109.62 

109.85 

110.07 

110.30 

110.52 

33 

106.25 

106.47 

106.70 

106.92 

107.15 

107.37 

107.60 

107.82 

108.05 

108.27 

32 

104.00 

104.22 

104.45 

104.67 

104.90 

105.12 

105.35 

105.57 

105.80 

106.02 

31 

101.75 

101.97 

102.20 

102.42 

102.65 

102.87 

103.10 

103.32 

103.55 

103.77 

30 

99.50 

99.72 

99.95 

100.17 

100.40 

100.62 

100.85 

101.07 

101.30 

101.52 

29 

97.25 

97.47 

97.70 

97.92 

98.15 

98.37 

98.60 

98.82 

99.05 

99.27 

28 

95.00 

95.22 

95.45 

95.67 

95.90 

96.12 

96.35 

96.57 

96.80 

97.02 

27 

92.75 

92.97 

93.20 

93.42 

93.65 

93.87 

94.10 

94.32 

94.53 

94.77 

26 

90.50 

90.72 

90.95 

91.17 

91.40 

91.62 

91.85 

92.07 

92.30 

92.52 

25 

88.25 

88.47 

88.70 

88.92 

89.15 

89.37 

89.60 

89.82 

90.05 

90.27 

24 

86.00 

86.22 

86.45 

86.67 

86.90 

87.12 

87.35 

87.57 

87.80 

88.02 

23 

83.75 

83.97 

84.20 

84.42 

84.65 

84.87 

85.10 

85.32 

85.55 

85.77 

22 

81.50 

81.72 

81.95 

82.17 

82.40 

82.62 

82.85 

83.07 

83.30 

83.52 

21 

79.25 

79.47 

79.70 

79.92 

80.15 

80.37 

80.60 

80.82 

81.05 

81.27 

20 

77.00 

77.22 

77.45 

77.67 

77.90 

78.12 

78.35 

78.57 

78.80 

79.02 

19 

74.75 

74.97 

75.20 

75.42 

75.65 

75.87 

76.10 

76.32 

76.55 

76.77 

18 

72.50 

72.72 

72.95 

73.17 

73.40 

73.62 

73.85 

74.07 

74.30 

74.52 

17 

70.25 

70.47 

70.70 

70.92 

71.15 

71.37 

71.60 

71.82 

72.05 

72.27 

16 

68.00 

68.22 

68.45 

68.67 

68.90 

69.12 

69.35 

69.57 

69.80 

70.02 

15 

65.75 

65.97 

66.20 

66.42 

66.65 

66.87 

67.10 

67.32 

67.55 

67.77 

14 

63.50 

63.72 

63.95 

64.17 

64.40 

64.62 

64.85 

65.07 

65.30 

65.52 

13 

61.25 

61.47 

61.70 

61.92 

62.15 

62.37 

62.60 

62.82 

63.05 

63.27 

12 

59.00 

59.22 

59.45 

59.67 

59.90 

60.12 

60.35 

60.57 

60.80 

61.02 

11 

56.75 

56.97 

57.20 

57.42 

57.65 

57.87 

58.10 

58.32 

58.55 

58.77 

10 

54.50 

54.72 

54.95 

55.17 

55.40 

55.62 

55.85 

56.07 

56.30 

56.52 

9 

52.25 

52.47 

52.70 

52.92 

53.15 

53.37 

53.60 

53.82 

54.05 

54.27 

8 

50.00 

50.22 

50.45 

50.67 

50.90 

51.12 

51.35 

51.57 

51.80 

52.02 

7 

47.75 

47.97 

48.20 

48.42 

48.65 

48.87 

49.10 

49.32 

49.55 

49.77 

6 

45.50 

45.72 

45.95 

46.17 

46.40 

46.62 

46.85 

47.07 

47.30 

47.52 

5 

43.25 

43.47 

43.70 

43.92 

44.15 

44.37 

44.60 

44.82 

45.05 

45.27 

4 

41.00 

41.22 

41.45 

41.67 

41.90 

42.12 

42.35 

42.57 

42.80 

43.02 

3 

38.75 

38.97 

39.20 

39.42 

39.65 

39.87 

40.10 

40.32 

40.55 

40.77 

2 

36.50 

36.72 

36.95 

37.17 

37.40 

37.62 

37.85 

38.07 

38.30 

38.52 

1 

34.25 

34.47 

34.70 

34.92 

35.15 

35.37 

35.60 

35.82 

36.05 

36.27 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

?. 

8. 

9. 

30 


CONVERSION    OF    DEGREES    OF    REAUMUR    INTO    DEGREES    OF    FAHRENHEIT. 


Tenths  of  Degrees. 

Degrees  of 
Reaumur. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

Fahren. 

+  0 

+32.00 

+32.22 

+32.45 

+32.67 

+32.90 

+33.12 

+33.35 

+33.57 

+33.80 

+34.02 

-  0 

32.00 

31.77 

31.55 

31.32 

31.10 

30.87 

30.65 

30.42 

30.20 

29.97 

-  1 

29.75 

29.52 

29.30 

29.07 

28.85 

28.62 

28.40 

28.17 

27.95 

27.72 

-  2 

27.50 

27.27 

27.05 

26.82 

26.60 

26.37 

26.15 

25.92 

25.70 

25.47 

-  3 

25.25 

25.02 

24.80 

24.57 

24.35 

24.12 

23.90 

23.67 

23.45 

23.22 

-  4 

23.00 

22.77 

22.55 

22.32 

22.10 

21.87 

21.65 

21.42 

21.20 

20.97 

-  5 

20.75 

20.52 

20.30 

20.07 

19.85 

19.62 

19.40 

19.17 

18.95 

18.72 

-  6 

18.50 

18.27 

18.05 

17.82 

17.60 

17.37 

17.15 

16.92 

16.70 

16.47 

-  7 

16.25 

16.02 

15.80 

15.57 

15.35 

15.12 

14.90 

14.67 

14.45 

14.22 

-  8 

14.00 

13.77 

13.55 

13.32 

13.10 

12.87 

12.65 

12.42 

12.20 

11.97 

-  9 

11.75 

11.52 

11.30 

11.07 

10.85 

10.62 

10.40 

10.17 

9.95 

9.72 

-10 

9.50 

9.27 

9.05 

8.82 

8.60 

8.37 

8.15 

7.92 

7.70 

7.47 

-11 

7.25 

7.02 

6.80 

6.57 

6.35 

6.12 

5.90 

5.67 

5.45 

5.22 

-12 

5.00 

4.77 

4.55 

4.32 

4.10 

3.87 

3.65 

3.42 

3.20 

2.97 

-13 

2.75 

2.52 

2.30 

2.07 

1.85 

1.62 

1.40 

1.17 

0.95 

0.72 

-14 

0.50 

0.27 

0.05 

-  0.17 

-  0.40 

-  0.62 

-  0.85 

-  1.07 

-  1.30 

-  1.52 

-15 

-  1.75 

-  1.97 

-  2.20 

-  2.42 

-  2.65 

-  2.87 

-  3.10 

-  3.32 

-  3.55 

-  3.77 

-16 

-  4.00 

-  4.22 

-  4.45 

-  4.67 

-  4.90 

-  5.12 

-  5.35 

-  5.57 

-  5.80 

-  6.02 

-17 

-  6.25 

-  6.47 

-  6.70 

-  6.92 

-  7.15 

-  7.37 

-  7.60 

-  7.82 

-  8.05 

-  8.27 

-18 

-  8.50 

-  8.72 

-  8.95 

-  9.17 

-  9.40 

-  9.62 

-  9.85 

-10.07 

-10.30 

-10.52 

-19 

-10.75 

-10.97 

-11.20 

-11.42 

-11.65 

-11.87 

-12.10 

-12.32 

-12.55 

-12.77 

-20 

-13.00 

-13.22 

-13.45 

-13.67 

-13.90 

-14.12 

-14.35 

-14.57 

-14.80 

-15.02 

-21 

-15.25 

-15.47 

-15.70 

-15.92 

-16.15 

-16.37 

-16.60 

-16.82 

-17.05 

-17.27 

-22 

-17.50 

-17.72 

-17.95 

-18.17 

-18.40 

-18.62 

-18.85 

-19.07 

-19.30 

-19.52 

-23 

-19.75 

-19.97 

-20.20 

-20.42 

-20.65 

-20.87 

-21.10 

-21.32 

-21.55 

-21.77 

-24 

-22.00 

-22.22 

-22.45 

-22.67 

-22.90 

-23.12 

-23.35 

-23.57 

-23.80 

-24.02 

-25 

-24.25 

-24.47 

-24.70 

-24.92 

-25.15 

-25.37 

-25.60 

-25.82 

-26.05 

-26.27 

-26 

-26.50 

-26.72 

-26.95 

-27.17 

-27.40 

-27.62 

-27.85 

-28.07 

-28.30 

-28.52 

-27 

-28.75 

-28.97 

-29.20 

-29.42 

-29.65 

-29.87 

-30.10 

-30.32 

-30.55 

-30.77 

-28 

-31.00 

-31.22 

-31.45 

-31.67 

-31.90 

-32.12 

-32.35 

-32.57 

-32.80 

-33.02 

-29 

-33.25 

-33.47 

-33.70 

-33.92 

-34.15 

-34.37 

-34.60 

-34.82 

-35.05 

-35.27 

-30 

-35.50 

-35.72 

-35.95 

-36.17 

-36.40 

-36.62 

-36.85 

-37.07 

-37.30 

-37.52 

-31 

-37.75 

-37.97 

-38.20 

-38.42 

-38.65 

-38.87 

-39.10 

-39.32 

-39.55 

-39.77 

-32 

-40.00 

-40.22 

-40.45 

-40.67 

-40.90 

-41.12 

-41.35 

-41.57 

-41.80 

-42.02 

-33 

-42.25 

-42.47 

-42.70 

-42.92 

-43.15 

-43.37 

-43.60 

-43.82 

-44.05 

-44.27 

-34 

-44.50 

-44.72 

-44.95 

-45.17 

-45.40 

-45.62 

-45.85 

-46.07 

-46.30 

-46.52 

-35 

-46.75 

-46.97 

-47.20 

-47.42 

-47.65 

-47.87 

-48.10 

-48.32 

-48.55 

-48.77 

-36 

-49.00 

-49.22 

-49.45 

-49.67 

-49.90 

-50.12 

-50.35 

-50.57 

-50.80 

-51.02 

-37 

-51.25 

-51.47 

-51.70 

-51.92 

-52.15 

-52.37 

-52.60 

-52.82 

-53.05 

-53.27 

-38 

-53.50 

-53.72 

-53.95 

-54.17 

-54.40 

-54.62 

-54.85 

-55.07 

-55.30 

-55.52 

-39 

-55.75 

-55.97 

-56.20 

-56.42 

-56.65 

-56.87 

-57.10 

-57.32 

-57.55 

-57.77 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

31 


IX.   CONVERSION  OF  DEGREES  OF  REAUMUR  INTO  CENTIGRADE  DEGREES. 


Tenths  of  Degrees. 

Degrees  of 
Reaumur. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

4 
8. 

9. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

±40 

+50.00 

+50.13 

+50.25 

+50.38 

±50.50 

±50.63 

+50.75 

±50.88 

±51.00 

±51.13 

39 

48.75 

48.88 

49.00 

49.13 

49.25 

49.38 

49.50 

49.63 

49.75 

49.88 

38 

47.50 

47.63 

47.75 

47.88 

48.00 

48.13 

48.25 

48.38 

48.50 

48.63 

37 

46.25 

46.38 

46.50 

46.63 

46.75 

46.88 

47.00 

47.13 

47.25 

47.38 

36 

45.00 

45.13 

45.25 

45.38 

45.50 

45.63 

45.75 

45.88 

46.00 

46.13 

35 

43.75 

43.88 

44.00 

44.13 

44.25 

44.38 

44.50 

44.63 

44.75 

44.88 

34 

42.50 

42.63 

42.75 

42.88 

43.00 

43.13 

43.25 

43.38 

43.50 

43.63 

33 

41.25 

41.38 

41.50 

41.63 

41.75 

41.88 

42.00 

42.13 

42.25 

42.38 

32 

40.00 

40.13 

40.25 

40.38 

40.50 

40.63 

40.75 

40.88 

41.00 

41.13 

31 

38.75 

38.88 

39.00 

39.13 

39.25 

39.38 

39.50 

39.63 

39.75 

39.88 

30 

37.50 

37.63 

37.75 

37.88 

38.00 

38.13 

38.25 

38.38 

38.50 

38.63 

29 

36.25 

36.38 

36.50 

36.63 

36.75 

36.88 

37.00 

37.13 

37.25 

37.38 

28 

35.00 

35.13 

35.25 

35.38 

35.50 

35.63 

S5.75 

35.88 

36.00 

36.13 

27 

33.75 

33.88 

34.00 

34.13 

34.25 

34.38 

34.50 

34.63 

34-75 

34.88 

26 

32.50 

32.63 

32.75 

32.88 

33.00 

33.13 

33.25 

33.38 

33.50 

33.63 

25 

31.25 

31.38 

31.50 

31.63 

31.75 

31.88 

32.00 

32.13 

32.25 

.32.38 

24 

30.00 

30.13 

30.25 

30.38 

30.50 

30.63 

30.75 

30.88 

31.00 

31.13 

23 

28.75 

28.88 

29.00 

29.13 

29.25 

29.38 

29.50 

29.63 

29.75 

29.88 

22 

27.50 

27.63 

27.75 

27.88 

28.00 

28.13 

28.25 

28.38 

28.50 

28.63 

21 

26.25 

26.38 

26.50 

26.63 

26.75 

26.88 

27.00 

27.13 

27.25 

27.38 

20 

25.00 

25.13 

25.25 

25.38 

25.50 

25.63 

25.75 

25.88 

26.00 

26.13 

19 

23.75 

23.88 

24.00 

24.13 

24.25 

24.38 

24.50 

24.63 

24.75 

24.88 

18 

22.50 

22.63 

22.75 

22.88 

23.00 

23.13 

23.25 

23.38 

23-50 

23.63 

17 

21.25 

21.38 

21.50 

21.63 

21.75 

21,88 

22.00 

22.13 

22.25 

22.38 

16 

20.00 

20.13 

20.25 

20.38 

20.50 

20.63 

20.75 

20.88 

21.00 

21.13 

15 

18.75 

18.88 

19.00 

19.13 

19.25 

19.38 

19.50 

19.63 

19.75 

19.88 

14 

17.50 

17.63 

17.75 

17.88 

18.00 

18.13 

18.25 

18.38 

18.50 

18.63 

13 

16.25 

16.38 

16.50 

16.63 

16.75 

16.88 

17.00 

17.13 

17.25 

17.38 

12 

15.00 

15.13 

15.25 

15.38 

15.50 

15.63 

15.75 

15.88 

16.00 

16.13 

11 

13.75 

13.88 

14.00 

14.13 

14.25 

14.38 

14.50 

14.63 

14.75 

14.88 

10 

12.50 

12.63 

12.75 

12.88 

13.00 

13.13 

13.25 

13.38 

13.50 

13.63 

9 

11.25 

11.38 

11.50 

11.63 

11.75 

11.88 

12.00 

12.13 

12.25 

12.38 

8 

10.00 

10.13 

10.25 

10.38 

10.50 

1Q.63 

10.75 

10.88 

11.00 

11.13 

7 

8.75 

8.88 

9.00 

9.13 

9.25 

9.38 

9.50 

9.63 

9.75 

9.88 

6 

7.50 

7.63 

7.75 

7.88 

8.00 

8.13 

8.25 

8.38 

8.50 

8.63 

5 

6.25 

6.38 

6.50 

6.63 

6.75 

6.88 

7.00 

7.13 

7.25 

7.38 

4 

5.00 

5.13 

5.25 

5.38 

5.50 

5.63 

5.75 

5.88 

6.00 

6.13 

3 

3.75 

3.88 

4.00 

4.13 

4.25 

4.38 

4.50 

4.63 

4.75 

4.88 

2 

2.50 

2.63 

2.75 

2.88 

3.00 

3.13 

3.25 

3.38 

3.50 

3.63 

1 

1.25 

1.38 

1.50 

1.63 

1.75 

1.88 

2.00 

2.13 

2.25 

2.38 

0 

0.00 

0.13 

0.25 

0.38 

0.50 

0.63 

0.75 

0.88 

1.00 

1.13 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

X.-XV. 


TABLES 


FOR 


i 

COMPARING   THERMOMETRICAL    DIFFERENCES 


EXPKESSED  IN  DEGREES  OF  DIFFERENT  SCALES, 


IRRESPECTIVE    OF  THEIR   ZERO  POINT. 


X.       NUMBER    OF    DEGREES    OF    FAHRENHEIT  =:  NUMBER    OF    CENTIGRADE    DEGREES. 
4°  Reaumur  =  5"  Centigrade  =  9°  Fahrenheit. 


Tenths  of  a  Degree. 

Degrees 

of 

Fcihrcn.- 

A 

heit. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

*8. 

9. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig.  • 

Centig. 

Centig. 

0 

0.00 

0.06 

0.11 

0.17 

0.22 

0.28 

0.33 

0.39 

0.44 

0.50 

1 

0.56 

0.61 

0.67 

0.72 

0.78 

0.83 

0.89 

0.94 

1.00 

1.06 

2 

1.11 

1.17 

1.22 

1.28 

1.33 

1.39 

1.44 

1.50 

1.56 

1.61 

3 

1.67 

1.72 

1.78  ' 

1.83 

1.89 

1.94 

2.00 

2.06 

2.11 

2.22 

4 

2.22 

2.28 

2.33 

2.39 

2.44 

2.50 

2.56 

2.61 

2.67 

2.72 

5 

2.78 

2.83 

2.89 

2.94 

3.00 

3.06 

3.11 

3.17 

3.22 

3.28 

6 

3.33 

3.39 

3.44 

3.50 

3.56 

3.61 

3.67 

4.72 

3.78 

3.83 

7 

3.89 

3.94 

4.00 

4.06 

4.11 

4.17. 

4.22 

4.28 

4.33 

4.39 

8 

4.44 

4.50 

4.56 

4.61 

4.67' 

4.72 

4.78 

4.83 

4.89 

4.94 

9 

5.00 

5.06 

5.11 

5.17 

5.22 

5.28 

5.32 

5.39 

5.44 

5.50 

XI.      NUMBER  OF  DEGREES  OF  FAHRENHEIT  =  NUMBER  OF  DEGREES  OF  REAUMUR. 

Tenths  of  a  Degree. 

Degrees 

of 

Fahren- 

heit. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Reaumur. 
0.00 

Reaumur. 
0.04 

leaumur. 
0.09 

Reaumur. 
0.13 

Reaumur. 
0.18 

Reaumur. 
0.22 

Reaumur. 
0.27 

Reaumur. 
0.31 

Reaumur. 
0.36 

Reaumur. 
0.40 

1 

0.44 

0.49 

0.53 

0.58 

0.62 

0.67 

0.71 

0.76 

0.80 

0.84 

2 

0.89 

0.93 

0.98 

1.02 

1.07 

1.11 

1.16 

1.20 

1.24 

1.29 

3 

1.33 

1.38 

1.42 

1.47 

1.51 

1.56 

1.60 

1.64 

1.69 

1.73 

4 

1.78 

1.82 

1.87 

1.91 

1.96 

2.00 

2.04 

2.09 

2.13 

2.18 

5 

2.22 

2.27 

2.31 

2.36 

2.40 

2.44 

2.49 

2.53 

2.58 

2.62 

6 

2.67 

2.71 

2.76 

2.80 

2.84 

2.89 

2.93 

2.98 

3.02 

3.07 

7 

3.11 

3.16 

3.20 

3.24 

3.29 

3.33 

3.38 

3.42 

3.47 

3.51 

8 

3.56 

3.60 

3.64 

3.69 

3.73 

3.78 

3.82 

3.87 

3.91 

3.96 

9 

4.00 

4.04 

4.09 

4.13 

4.18 

4.22 

4.27 

4.31 

4.36 

4.40 

XII.      NUMBER  OF  CENTIGRADE  DEGREES  =  NUMBER  OF  DEGREES  OF  REAUMUR. 

Tenths  of  a  Degree. 

Centig. 

Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Reaumur. 
0.00 

Reaumur. 

o.os 

Reaumur. 
0.16 

Reaumur. 
0.24 

Reaumur. 
0.32 

Reaumur. 
0.40 

Reaumur. 
0.48 

Reaumur. 
0.56 

Reaumur. 
0.64 

0.72 

1 

0.80 

0.88 

0.96 

1.04 

1.12 

1.20 

1.28 

1.36 

1.44 

1.52 

2 

1.60 

1.63 

1.76 

1.84 

1.92 

2.00 

2.08 

2.16 

2.24 

2.32 

3 

2.40 

2.48 

2.56 

2.64 

2.72 

2.80 

2.88 

2.96 

3.04 

3.12 

4 

3.20 

3.2S 

3.36 

3.44 

3.52 

3.60 

3.63 

3.76 

3.84 

3.92 

5 

4.00 

4.08 

4.16 

4.24 

4.32 

4.40 

4.48 

4.56 

4.64 

4.72 

6 

4.80 

4.88 

4.96 

5.04 

5.12 

5.20 

5.28 

5.36 

5.44 

5.52 

7 

5.60 

5.63 

5.76 

5.84 

5.92 

6.00 

6.08 

6.16 

6.24 

6.32 

8 

6.40 

6.48 

6.56 

6.64 

6.72 

6.80 

6.88 

6.96 

7.04 

7.12 

9 

7.20 

7.28 

7.36 

7.44 

7.52 

7.60 

7.63 

7.76 

7.84 

7.92 

34 


XIII.       NUMBER    OF    CENTIGRADE    DEGREES  =  NUMBER    OF    DEGREES    OF    FAHRENHEIT. 
4"  Reaumur  =  5°  Centigrade  =  9'  Fahrenheit. 


Tenths  of  a  Degree. 

Centig. 

. 

Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Fahr. 
0.00 

Fahr. 
0.18 

Fahr. 
0.36 

Fahr. 
0.54 

Fahr. 
0.72 

Fahr. 
0.90 

Fahr. 
1.08 

Fahr. 
1.26 

Fahr. 
1.44 

Fahr. 
1.62 

1 

1.80 

1.98 

2.16 

2.34 

2.52 

2.70 

2.88 

3.06 

3.24 

3.42 

2 

3.60 

3.78 

3.96 

4.14 

4.32 

4.50 

4.68 

4.86 

5.04 

5.22 

3 

5.40 

5.58 

5.76 

5.94 

6.12 

6.30 

6.4S 

6.66 

6.84 

7.02 

4 

7.20 

7.38 

7.56 

7.74 

7.92 

8.10 

8.28 

8.46 

8.64 

8.82 

5 

9.00 

9.18 

9.36 

9.54 

9.72 

9.90 

10.08 

10.26 

10.44 

10.62 

6 

10.80 

10.98 

11.16 

11.34 

11.52 

11.70 

11.88 

12.06 

12.24 

12.42 

7 

12.60 

12.78 

12.96 

13.14 

13.32 

13.50 

13.68 

13.86 

14.04 

14.22 

8 

14.40 

14.58 

14.76 

14.94 

15.12 

15.30 

15.48 

15.66 

15.84 

16.02 

9 

16.20 

16.38 

16.56 

16.74 

16.92 

17.10 

17.28 

17.46 

17.64 

17.82 

XIV.      NUMBER  OF  DEGREES  OF  REAUMUR  =  NUMBER  OF  CENTIGRADE  DEGREES. 

Tenths  of  a  Degree. 

Degrees 

of 

Reaum. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

Centig. 

0 

0.00 

0.12 

0.25 

0.37 

0.50 

0.62 

0.75 

0.87 

1.00 

1.12 

1 

1.25 

1.37 

1.50 

1.62 

1.75 

1.87 

2.00 

2.12 

2.25 

2.37 

2 

2.50 

2.62 

2.75 

2.87 

3.00 

3.12 

3.25 

3.37 

3.50 

3.62 

3 

3.75 

3.87 

4.00 

4.12 

4.25 

4.37 

4.50 

4.62 

4.75 

4.87 

4 

5.00 

5.12 

5.25 

5.37 

5.50 

5.62 

5.75 

5.87 

6.00 

6.12 

5 

6.25 

6.37 

6.50 

6.62 

6.75 

6.87 

7.00 

7-12 

7.25 

7.37 

6 

7.50 

7.62 

7.75 

7.87 

8.00 

8.12 

8.25 

8.37 

8.50 

8.62 

7 

8.75 

8.87 

9.00 

9.12 

9.25 

9.37 

9.50 

9.62 

9.75 

9.87 

8 

10.00 

10.12 

10.25 

10.37 

10.50 

10.62 

10.75 

10.87 

11.00 

11.12 

9 

11.25 

11.37 

11.50 

11.62 

11.75 

11.87 

12.00 

12.12 

12.25 

12.37 

XV.      NUMBER  OF  DEGREES  OF  REAUMUR  =  NUMBER  OF  DEGREES  OF  FAHRENHEIT. 

Tenths  of  a  Degree. 

Degrees 
of 

Reaum. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Fahr. 
0.00 

Fahr. 
0.22 

Fahr. 
0.45 

Fahr. 
0.67 

Fahr. 
0.90 

Fahr. 
1.12 

Fahr. 
1.35 

Fahr. 
1.57 

Fahr. 
1.80 

Fahr. 
2.02 

1 

2.25 

2.47 

2.70 

2.92 

3.15 

3.37 

3.60 

3.82 

4.05 

4.27 

2 

4.50 

4.72 

4.95 

5.17 

5.40 

5.62 

5.85 

6.07 

6.30 

6.52 

3 

6.75 

6.97 

7.20 

7.42 

7.65 

7.87 

8.10 

8.32 

8.55 

8.77 

4 

9.00 

9.22 

9.45 

9.67 

9.90 

10.12 

10.35 

10.57 

10.80 

11.02 

5 

11.25 

11.47 

11.70 

11.92 

12.15 

12.37 

12.60 

12.82 

13.05 

13.27 

6 

13.50 

13.72 

13.95 

14.17 

14.40 

14.62 

14.85 

15.07 

15.30 

15.52 

7 

15.75 

15.97 

16-20 

16.42 

16.65 

16.87 

17.10 

17.32 

17.55 

17.77    I 

8 

18.00 

18.22 

18.45 

18.67 

18.90 

19.12 

19.35 

19.57 

19.80 

20.02    j 

9 

20.25 

20.47 

20.70 

20.92 

21.15 

21.37 

21.60 

21.82 

22.05 

22.27 

35 


METEOROLOGICAL    TABLES 


II. 


HYGROMETRICAL   TABLES. 


B 


CONTENTS. 


(The  figures  refer  to  the  folio  at  the  bottom  of  the  page.) 

PRACTICAL  TABLES  BASED  ON  REGNAULT'S  HYGROMETRICAL  CONSTANTS. 

a.  In  French  Measures. 

Page 

TABLE      I.     Elastic  Force  of  Aqueous  Vapor,  by  Regnault      ....       9 
II.     Psychrometrical  Tables,  by  Haeghens      .....         12 

III.  For  deducing  the  Relative  Humidity  from  the  Indications  of  Dew- 

Point  Instruments,  by  Haeghens 30 

100 

IV.  Factor  -=-  for  computing  Relative  Humidity     ....         36 
V.     Weight  of  Vapor  contained  in  a  Cubic  Metre  of  Air      .         .         .38 

I.  In  English  Measures. 

VI.     Elastic  Force  of  Vapor,  reduced  from  Regnault's  Table     .         .         43 
"       VII.     Psychrometrical  Tables,  by  A.  Guyot  .         .  .         .46 

"      VIII.     For  deducing  the  Relative  Humidity  from  the  Indications  of  Dew- 

Point  Instruments,  by  A.  Guyot       .         .  .         .         .73 

i  no 
D£.     Factor  -^-,  for  computing  Relative  Humidity    ....         88 

"          X.     Weight  of  Vapor  in  a  Cubic  Foot  of  Saturated  Air        ...     92 

PRACTICAL  TABLES  BASED  ON  THE  HYGROMETRICAL  CONSTANTS  ADOPTED  IN  THE 
GREENWICH  OBSERVATIONS. 

TABLE    XI.     Elastic  Force  of  Aqueous  Vapor  .....  99 

"       XII.     Psychrometrical  Tables,  by  Glaisher 102 

"      XIII.     Factors  for  computing  the  Force  of  Vapor  from  Psychrometrical 

Observations,  by  Apjohn's  Formula 138 

"      XIV.     Factors  for  finding  the  Temperature  of  the  Dew-Point  from  the 

Readings  of  the  Psychrometer 140 

"       XV.     Weight  of  Vapor  contained  in  a  Cubic  Foot  of  Saturated  Air    .         141 
".     XVI.     Factors  for  deducing  the  Weight  of  Vapor  from  the  Indications  of 

Dew-Point  Instruments  .         .         .         .         .         .         .         .141 

"    XVII.     For  comparing  the  Weight  of  a  Cubic  Foot  of  Dry  and  of  Satu- 
rated Air 142 

B  3 


CONTENTS. 


TABLE 
it 


MISCELLANEOUS  TABLES  FOR  COMPARISON. 

XVIII.     Elastic  Force  of  Vapor,  expressed  in  Millimetres,  by  August  . 
XIX.     Elastic  Force  of  Vapor,  expressed  in  Millimetres,  by  Kaemtz 
XX.     Elastic  Force  of  Vapor,  expressed  in  Millimetres,  by  Magnus 
XXI.     Elastic  Force  of  Vapor,  in  English  Inches,  from  the  Royal 
Society's  Report        ........ 

XXII.     For  showing  the  Differences  in  the  Values  of  the  Elastic  Force 
of  Vapor  adopted  by  different  Authorities    .... 

XXIII.  Weight  of  Vapor,  in  Grammes,  contained  in  a  Cubic  Metre  of 

Saturated  Air,  by  Pouillet          ...... 

XXIV.  Weight  of  Vapor,  in  Grammes,  contained  in  a  Cubic  Metre  of 

Air,  by  Kaemtz         ........ 

XXV.  Force  of  Vapor  and  Relative  Humidity  corresponding  to  the 

Degrees  of  Saussure's  Hair- Hygrometer,  by  Gay-Lussac 
XXVI.     For  deducing  the  Relative  Humidity  from  the  Indications  of 

Saussure's  Hair-Hygrometer,  by  Haeghens 

XXVII.     Relative  Humidity  corresponding  to  the  Degrees  of  Saussure's 
Hygrometer,  by  Kaemtz 


Page 

148 
150 
150 

151 
152 
154 
154 
155 
156 
157 


APPENDIX. 

FOR  COMPARING  QUANTITIES  OF  RAIN-WATER  GIVEN  IN  DIFFERENT  MEASURES. 


TABLE  I.  Conversion  of  Centimetres  into  English  Inches 

"       II.  Conversion  of  Centimetres  into  French  Inches  and  Lines 

"     III.  Conversion  of  English  Inches  into  Centimetres   . 

"     IV.  Conversion  of  English  Inches  into  French  Inches  and  Lines 

"      V.  Conversion  of  French  Inches  and  Lines  into  Centimetres 

"     VI.  Conversion  of  French  Inches  and  Lines  into  English  Inches 


162 
162 
163 
163 
164 
165 


B 


HY  GEOMETRICAL     TABLES. 


HYGROMETERS,  or  instruments  used  for  determining  the  amount  of  aqueous  vapor 
present  in  the  air,  are  of  three  classes.  In  the  first,  we  find  the  hygrometers 
based  on  the  absorption  of  moisture  by  hygroscopic  substances,  the  best  of  which  is 
Saussure's  Hair-Hygrometer  ;  in  the  second  class,  the  Psychrometer,  or  wet-bulb 
thermometer,  which  gives  the  temperature  of  evaporation  ;  in  the  third,  the  various 
instruments  designed  for  ascertaining  the  temperature  of  the  dew-point.  From  the 
data  furnished  by  each  of  these  instruments,  and  a  table  of  the  elastic  forces  of  vapor 
at  different  temperatures,  the  humidity  of  the  air  can  be  deduced  with  more  or  less 
accuracy. 

The  use  of  the  hygroscopic  substances  as  hygrometers  having  been  nearly  given 
up  on  account  of  the  inaccuracy  of  the  results,  the  variability  of  the  instruments,  and 
the  difficulty,  if  not  impossibility,  of  making  them  comparable,  the  psychrometer  and 
the  dew-point  instruments  represent  the  two  methods  now  usually  employed  in 
Meteorology.  The  following  set,  therefore,  contains  extensive  tables,  in  French  and 
English  measures,  for  deducing  the  hygrometrical  condition  of  the  atmosphere  from 
the  indications  of  the  Psychrometer  and  of  the  dew-point  instruments,  to  which  have 
been  added  tables  of  the  weight  of  vapor,  in  a  given  space,  at  different  temperatures, 
—  an  element  often  needed  in  Meteorology. 

As,  however,  the  results  deduced  from  the  same  data  furnished  by  the  observations 
may  considerably  differ,  according  to  the  values  of  the  elastic  force  of  vapor,  and  the 
formulae  used  in  the  computation,  the  tables  have  been  arranged  in  two  series. 

The  first  series  contains  Regnault's  table  of  the  elastic  forces  of  vapor,  with  tables 
of  the  three  kinds  above  mentioned,  together  with  a  corresponding  set  in  English 
measures.  Tables  V.  to  X.  have  been  computed  for  this  volume. 

The  second  series  gives  the  table  of  elastic  forces  of  vapor  deduced  from  Dalton's 
experiments,  and  adopted  in  the  Greenwich  Observations,  together  with  the  various 
tables  based  on  it. 

B  5 


HYGROMETRICAL    TABLES. 

A  third  series  of  miscellaneous  tables  furnishes  the  means  of  comparing  the  differ- 
ent values  of  the  elastic  force  and  weight  of  vapor  determined  by  various  physicists, 
as  well  as  the  results  of  Saussure's  Hair- Hygrometer,  with  those  obtained  by  other 
methods. 

An  Appendix,  containing  tables  for  comparing  the  quantity  of  rain-water  indicated 
in  different  measures,  closes  the  set. 

Though  the  first  series  of  tables,  based  on  Regnault's  table  of  tensions,  is*  recom- 
mended for  ordinary  use,  as  being  derived  from  the  determinations  which  seem  to 
deserve  the  greatest  degree  of  confidence,  it  was  thought  expedient  to  give  also  the 
Greenwich  tables,  which  have  been,  and  still  are,  so  extensively  used  in  England,  in 
order  to  enable  meteorologists  to  judge  of  the  differences  which  exist  between  the 
results  obtained  by  them  and  those  deduced  from  the  constants  of  Regnault  and 
others. 


B 


PRACTICAL     TABLES, 


IN 


FRENCH    MEASURES, 


BASED     ON    REGNAULTS    HYGROMETRICAL     CONSTANTS. 


B 


TABLE 

OF 

THE  ELASTIC  FORCE  OF  AQUEOUS  VAPOR, 

EXPRESSED    IN    MILLIMETRES    OF    MERCURY    FOR    CENTIGRADE    TEMPERATURES, 

BY    REGNAULT. 


THIS  table  contains  the  elastic  forces  of  vapor  corresponding  to  every  tenth  of  a 
degree  of  temperature  between  —  35°  and  -J~  40°  Centigrade,  as  determined  by  the 
experiments  of  V.  Regnault,  made  by  Border  of  the  French  government,  for  the 
purpose  of  establishing  the  numerical  value  of  the  elements  which  enter  into  the 
computations  concerning  the  steam-engine.  These  results  are  generally  considered 
as  the  most  accurate  science  possesses  at  present.  They  are  published  in  the 
Memoires  de  Vlnstitut,  Tom.  XXI. ;  and  more  correctly  in  Regnault's  Etudes  sur 
VHygrometrie,  in  the  Annales  de  Chimie  et  de  Physique.  In  Vol.  XV.  Regnault 
gives  the  table  of  elastic  forces  for  every  tenth  of  a  degree  from  — 10°  to  -}-35° 
Centigrade,  which  is  reprinted  in  Table  I.  The  numbers  below  — 10°  and  above 
-f-  35°,  in  the  same  table,  have  been  taken  from  another  table  for  every  full  degree, 
previously  published  in  Vol.  XI.  p.  333  of  the  same  periodical,  and  in  the  same 
volume  of  the  Memoires  de  VInstitut,  extending  from  — 32°  to  +230°. 

It  should  be  remarked,  however,  that  the  numbers  below  zero,  in  the  two  tables 
just  mentioned,  having  been  computed  from  different  formulas  of  interpolation,  slightly 
disagree.  In  order  to  establish  a  continuity,  therefore,  the  numbers  in  Table  I.  cor- 
responding to  full  degrees  from  — 10°  to  —  35°  have  been  formed  by  starting  fron^ 
the  value  due  to  — 10°  in  the  larger  table  of  Regnault,  and  subtracting  from  it  the 
difference  between  — 10°  and  — 11°  in  the  other  table,  in  order  to  find  the  value 
of — 11°,  and  so  on,  by  subtracting  successively  the  corresponding  differences  to 
—  35°.  For  the  fractions  of  degrees  below  — 10°,  the  mean  values  have  been 
adopted  as  sufficiently  accurate  for  meteorological  purposes. 


I.    ELASTIC  FOKCE  OF  AQUEOUS  VAPOK, 

EXPRESSED  IN  MILLIMETRES  OP  MERCURY  FOR  CENTIGRADE  TEMPERATURES. 
BY  KEGNAULT. 


Tenths  of 

Degrees. 

ture 

Centigrade. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

-35 

0.221 

0.219 

0.216 

0.214 

0.211 

0.209 

0.207 

0.204 

0.202 

0.199 

-34 

0.247 

0.244 

0.242 

0.249 

0.237 

0.234 

0.231 

0.229 

0.226 

0.224 

-33 

0.275 

0.272 

0.269 

0.267 

0.264 

0.261 

0.258 

0.255 

0.253 

0.250 

-32 

0.305 

0.302 

0.299 

0.296 

0.293 

0.290 

0.287 

0.284 

0.281 

0.278 

-31 

0.337 

0.334 

0.331 

0.327 

0.324 

0.321 

0.318 

0.315 

0.311 

0.308 

-30 

0.371 

0.368 

0.364 

0.361 

0.357 

0.354 

0.351 

0.347 

0.344 

0.340 

-29 

0.409 

0.405 

0.401 

0.398 

0.394 

0.390 

0.386 

0.382 

0.379 

0.375 

-28 

0.449 

0.445 

0.441 

0.437 

0.433 

0.429 

0.425 

0.421 

0.417 

0.413 

-27 

0.493 

0.489 

0.484 

0.480 

0.475 

0.471 

0.467 

0.462 

0.458 

0.453 

-26 

0.540 

0.535 

0.531 

0.526 

0.521 

0.516 

0.512 

0.507 

0.502 

0.498 

-25 

0.590 

0.585 

0.580 

0.575 

0.570 

0.565 

0.560 

0.555 

0.550 

0.545 

-24 

0.645 

0.639 

0.634 

0.628 

0.623 

0.617 

0.612 

0.606 

0.601 

0.595 

-23 

0.704 

0.698 

0.692 

0.686 

0.680 

0.674 

0.669 

0.663 

0.657 

0.651 

-22 

0.768 

0.762 

0.755 

0.749 

0.742 

0.736 

0.730 

0.723 

0.717 

0.710 

-21 

0.838 

0.831 

0.824 

0.817 

0.810 

0.803 

0.796 

0.789 

0.782 

0.775 

-20 

0.912 

0.905 

0.897 

0.890 

0.882 

0.875 

0.868 

0.860 

0.853 

0.845 

-19 

0.993 

0.985 

0.977 

0.969 

0.961 

0.952 

0.944 

0.936 

0.928 

0.920 

-IS 

1.080 

1.071 

1.063 

1.054 

1.045 

1.036 

1.028 

1.019 

1.010 

1.002 

-17 

.174 

1.165 

1.155 

1.146 

1.136 

I.f27 

1.118 

1.108 

.099 

1.089 

-16 

.275 

1.265 

1.255 

1.245 

1.235 

1.224 

1.214 

1.204 

.194 

1.184 

-15 

.385 

1.374 

.363 

1.352 

1.341 

.330 

1.319 

.308 

.297 

1.286 

-14 

.503 

1.491 

.479 

1.468 

1.456 

.444 

1.432 

.420 

.409 

1.397 

-13 

.631 

1.618 

.605 

1.593 

1.580 

.567 

1.554 

.541 

.529 

1.516 

-12 

.768 

1.754 

.741 

1.727 

1.713 

.699 

1.686 

.672 

.658 

1.645 

-11 

1.918 

1.903 

.888 

1.873 

1.858 

.843 

1.828 

.813 

.798 

1.783 

-10 

2.078 

2.062 

2.046 

2.030 

2.014 

1.998 

1.982 

1.966 

1.950 

1.934 

-  9 

2.261 

2.242 

2.223 

2.204 

2.186 

2.168 

2.150 

2.132 

2.114 

2.096 

-  8 

2.456 

2.436 

2.416 

2.396 

2.376 

2.356 

2.337 

2.318 

2.299 

2.280 

-7 

2.666 

2.645 

2.624 

2.603 

2.582 

2.561 

2.540 

2.519 

2.498 

2.477 

-  6 

2.890 

2.867 

2.844 

2.821 

2.798 

2.776 

2.754 

2.732 

2.710 

2.688 

-  5 

3.131 

3.106 

3.082 

3.058 

3.034 

3.010 

2.986 

2.962 

2.938 

2.914 

-  4 

3.387 

3.361 

3.335 

3.309 

3.283 

3.257 

3.231 

3.206 

3.181 

3.156 

-  3 

3.662 

3.634 

3.606 

3.578 

3.550 

3.522 

3.495 

3.468 

3.441 

3.414 

-  2 

3.955 

3.925 

3.895 

3.865 

3.836 

3.807 

3.778 

3.749 

3.720 

3.691 

-  1 

4.267 

4.235 

4.203 

4.J71 

4.140 

4.109 

4.078 

4.047 

4.016 

3.985 

-  0 

4.600 

4.565 

4.531 

4.497 

4463 

4.430 

4.397 

4.364 

4.331 

4.299 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

?. 

8. 

9. 

10 


ELASTIC  FORCE  OF  AQUEOUS  VAPOR.  REGNAULT. 


Centigrade 
Degrees. 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

O. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

4.600 

4.633 

4.667 

4.700 

4.733 

4.767 

4.801 

4.836 

4.871 

4.905 

1 

4.940 

4.975 

5.011 

5.047 

5.082 

5.118 

5.155 

5.191 

5.228 

5.265 

2 

5.302 

5.340 

5.378 

5.416 

5.454 

5.491 

5.530 

5.569 

5.608 

5.647 

3 

5.687 

5.727 

5.767 

5.807 

5.848 

5.889 

5.930 

5.972 

6.014 

6.055 

4 

6.097 

6.140 

6.183 

6.226 

6.270 

6.313 

6.357 

6.401 

6.445 

6.490 

5 

6.534 

6.5SO 

6.625 

6.671 

6.717 

6.763 

6.810 

6.857 

6.904 

6.951 

6 

6.998 

7.047 

7.095 

7.144 

7.193 

7.242 

7.292 

7.342 

7.392 

7.442 

7 

7.492 

7.544 

7.595 

7.647 

7.699 

7.751 

7.804 

7.857 

7.910 

7.964 

8 

8.017 

8.072 

8.126 

8.181 

8.236 

8.291 

8.347 

8.404 

8.461 

8.517 

9 

8.574 

8.632 

8.690 

8.748 

8.807 

8.865 

8.925 

8.985 

9.045 

9.105 

10 

9.165 

9.227 

9.288 

9.350 

9.412 

9.474 

9.537 

9.601 

9.665 

9.728 

11 

9.792 

9.857 

9.923 

9.989 

10.054 

10.120 

10.187 

10.255 

10.322 

10.389 

12 

10.457 

10.526 

10.596 

10.665 

10.734 

10.804 

10.875 

10.947 

11.019 

11.090 

13 

11.162 

11.235 

11.309 

11.383 

11.456 

11.530 

11.605 

11.681 

11.757 

11.832 

14 

11.908 

11.986 

12.064 

12.142 

12.220 

12.298 

12.378 

12.458 

12.538 

12.619 

15 

12.699 

12.781 

12.864 

12.947 

13.029 

13.112 

13.197 

13.281 

13.366 

13.451 

16 

13.536 

13.623 

13.710 

13.797 

13.885 

13.972 

14.062 

14.151 

14.241 

14.331 

r 

17 

14.421 

14.513 

14.605 

14.697 

14.790 

14.882 

14.977 

15.072 

15.167 

15.262 

18 

15.357 

15.454 

15.552 

15.650 

15.747 

15.845 

15.915 

16.045 

16.145 

16.246 

19 

16.346 

16.449 

16.552 

16.655 

16.758 

16.861 

16.967 

17.073 

17.179 

17.285 

20 

17.391 

17.500 

17.608 

17.717 

17.826 

17.935 

18.047 

18.159 

18.271 

18.383 

21 

18.495 

18.610 

18.724 

18.839 

18.954 

19.069 

19.187 

19.305 

19.423 

19.541 

22 

19.659 

19.780 

19.901 

20.022 

20.143 

20.265 

20.389 

20.514 

20.639 

20.763 

23 

20.888 

21.016 

21.144 

21.272 

21.400 

21.528 

21.659 

21.790 

21.921 

22.053 

24 

22.184 

22.319 

22.453 

22.588 

22.723 

22.858 

22.996 

23.135 

23.273 

23.411 

25 

23.550 

23.692 

23.834 

23.976 

24.119 

24.261 

24.406 

24.552 

24.697 

24.842 

26 

24.988 

25.138 

25.288 

25.438 

25.588 

25.738 

25.891 

26.045 

26.198 

26.351 

27 

26.505 

26.663 

26.820 

26.978 

27.136 

27.294 

27.455 

27.617 

27.778 

27.939 

28 

28.101 

28.267 

28.433 

28.599 

28.765 

28.931 

29.101 

29.271 

29.441 

29.612 

29 

29.782 

29.956 

30.131 

30.305 

30.479 

30.654 

30.833 

31.011 

31.190 

31.369 

30 

31.548 

31.729 

31.911 

32.094 

32.278 

32.463 

32.650 

32.837 

33.026 

33.215 

31 

33.406 

33.596 

33.787 

33.980 

34.174 

34.368 

34.564 

34.761 

34.959 

35.159 

32 

35.359 

35.559 

35.760 

35.962 

36.165 

36.370 

36.576 

36.783 

36.991 

37.200 

33 

37.410 

37.621 

37.832 

38.045 

38.258 

38.473 

38.689 

38.906 

39.124 

39.344 

34 

39.565 

39.786 

40.007 

40.230 

40.455 

40.680 

40.907 

41.135 

41.364 

41.595 

35 

41.827 

42.059 

42.293 

42.527 

42.763 

43.000 

43.238 

43.477 

43.717 

43.959 

'  36 

44.201 

44.445 

44.690 

44.936 

45.183 

45.431 

45.681 

45.932 

46.184 

46.437 

37 

46.691 

46.947 

47.203 

47.462 

47.721 

47.981 

48.243 

48.506 

48.770 

49.035 

38 

49.302 

49.570 

49.839 

50.110 

50.382 

50.655 

50.929 

51.205 

51.481 

51.759 

39 

52.039 

52.320 

52.602 

52.885 

53.170 

53.456 

53.743 

54.032 

54.322 

54.613 

40 

54.906 

55.200 

55.496 

55.793 

56.091 

56.391 

56.692 

56.994 

57.298 

57.603 

0.     1. 

2. 

3. 

4. 

5. 

6, 

7. 

8. 

9. 

B 


11 


II. 
PSYCHROMETRICAL  TABLES. 

GIVING    IMMEDIATELY  THE    FORCE    OF   AQUEOUS   VAPOR   AND    THE    RELATIVE   HUMIDITY 
FROM    THE    INDICATIONS    OF    THE    PSYCHROMETER. 

CALCULATED  BY  M.  T.  HAEGHENS.  - 


IN  his  Etudes  sur  VHygrometrie,*  M.  V.  Regnault  discusses  the  theoretical  bases  of 
the  formula  of  the  Psychrometer,  given  by  M.  August,  which  was, 

n         0.563  (t  —  V)   , 
X=J 640=7-  ^ 

in  which  h  represents  the  height  of  the  barometer ;  t  the  temperature  of  the  air  given 
by  the  dry-bulb  thermometer  ;  t'  the  temperature  of  the  wet-bulb  thermometer  ;  /  the 
force  of  .aqueous  vapor  in  the  saturated  air  at  a  temperature  equal  to  t' ;  x  the  elastic 
force  of  aqueous  vapor  which  exists  in  the  air  at  the  time  of  the  observation. 

After  having  modified  some  of  the  numerical  values,  which  form  the  coefficients, 

M.  Regnault  adopted  this  formula, 

j. 

But  comparative  experiments,  made  by  himself,  showed  that  by  substituting  the 
coefficient  0.480  for  that  of  0.429,  the  calculated  results,  and  those  obtained  by  direct 
observation,  agree  perfectly  in  the  fractions  of  saturation,  which  are  greater  than  0.40. 
This  formula  thus  modified,  or 


has  been  used  for  calculating  the  following  tables.  In  that  part  of  the  tables  which 
supposes  the  wet-bulb  to  be  covered  with  a  film  of  ice,  or  below  the  freezing  point, 
the  value  610 — £',  which  represents  the  latent  heat  of  aqueous  vapor,  has  been 
changed  into  this  :  610  +  79  —  t'  =  689  —  t1. 

The  only  hypothesis  made,  is  that  of  a  mean  barometric  pressure  7i,  equal  to  755 
millimetres.  If  we  take  into  account  the  causes  of  errors  inherent  to  the  psychrom- 
eter,  and  to  the  tables  of  the  force  of  vapor,  by  means  of  which  the  absolute  force  of 
vapor  is  calculated,  as  well  as  to  the  differences  of  these  tensions,  taken  at  tempera- 
tures differing  only  by  one  tenth  of  a  degree,  it  will  be  obvious  that  the  correction  due 
to  the  variations  of  barometric  pressure  can  almost  always  be  neglected.  Neverthe- 
less, a  separate  table  has  been  calculated,  giving  the  correction  to  be  applied  to  the 
numbers  in  the  Psychrometrical  Tables  for  the  heights  of  the  barometer  between  650 
and  800  millimetres.  It  will  be  found  at  the  end  of  the  tables. 

The  disposition  of  the  tables  is  the  following  :  — 

The  temperatures  are  noted  in  centigrade  degrees  ;  the  elastic  force  of  vapor  in  the 
air,  or  its  pressure  on  the  barometer,  is  expressed  in  millimetres  of  mercury ;  the  rel- 


*  Etudes  sur  VHygrometrie,  par  M.  V.  Regnault.    Annales  de  CJiimie  et  de  Physique,  3me  Serie,  Tom 
XV.,  1845. 

B  12 


PSYCHROMETRICAL    TABLES. 

ative  humidity  is  indicated  in  per  cent,  of  the  full  saturation  of  the  air  at  the  corre- 
sponding temperature  of  the  dry-bulb  thermometer  t. 

The  first  vertical  column  contains  the  indications  of  the  wet-bulb  thermometer  t', 
beginning  with  the  temperatures  below  the  freezing  point,  when  the  bulb  is  covered 
with  ice,  from  — 35°,  and  continuing  from  the  freezing  point  up  to  -|-350  centigrade, 
the  bulb  being  simply  wet. 

The  second  column  gives  the  differences  of  the  force  of  vapor  for  each  tenth  (0°.l) 
of  a  degree,  between  each  full  degree  of  the  first  column.  It  enables  the  observer  to 
find  out  the  correction  for  any  fraction  of  a  degree  of  the  wet-bulb  thermometer. 

The  following  double  columns  give  immediately  the  force  of  vapor  and  the  relative 
humidity,  corresponding  to  each  degree  of  the  wet-bulb,  placed  in  the  first  column, 
on  the  same  horizontal  line,  and  to  differences  of  the  two  thermometers,  or  to  t  —  2', 
taken  at  every  two  tenths  of  a  degree. 

The  horizontal  column  at  the  bottom  indicates  the  mean  difference,  for  each  tenth 
of  a  degree,  of  the  force  of  vapor  contained  in  the  same  horizontal  line.  It  gives  the 
correction  for  the  intermediate  differences  of  the  thermometers;  0.1,  0.3,  0.5,  0.7, 
0.9,  &c.,  &c. 

To  meet  the  wants  arising  from  the  extreme  climate  of  North  America,  the  tables 
of  Mr.  Haeghens  have  been  extended  from  — 15°  to  — 35°  centigrade,  and  from 
+30°  to  +35°  of  temperature  of  the  wet-bulb,  and  to  -(-40°  of  temperature  of  the 
dry-bulb  thermometer.  The  forces  of  aqueous  vapor  of  Regnault,  as  given  in 
Table  I.,  have  been  used  for  the  calculations. 

Use  of  the  Tables. 

Enter  the  tables  with  the  difference  of  the  two  thermometers,  or  t  —  t',  and  with 
the  temperature  of  the  wet-bulb  thermometer  t',  taking  the  first  three  pages,  when  the 
temperature  of  the  wet-bulb  is  below  the  freezing  point ;  and  the  following  ones  when 
it  is  above  the  freezing  point. 

Seek  first  the  column  at  the  head  of  which  you  find  the  difference  of  the  thermom- 
eters ;  go  down  as  far  as  the  horizontal  line,  at  the  beginning  of  which  you  see  the 
temperature  of  the  wet-bulb  thermometer ;  there  you  find  the  force  of  vapor,  and  the 
relative  humidity  corresponding  to  your  observation. 

Two  corrections  for  fractions  may  be  required  for  a  complete  calculation  of  the 
force  of  vapor ;  one  for  the  fractions  of  degrees  of  the  wet-bulb  thermometer ;  anoth- 
er for  the  intermediate  differences  of  the  two  thermometers,  viz.  for  0.1,  0.3,  0.5, 
0.7,  &c. 

The  first  correction  for  fractions  of  degrees  of  the  wet-bulb  thermometer  is  found  by 
multiplying  the  decimal  fraction  by  the  number  placed  in  the  second  vertical  column 
next  to  the  whole  degree,  which  number  is  the  value  of  a  tenth  of  a  degree.  The 
product  must  be  added  to  the  value  of  the  full  degree  given  in  the  table,  when  the  tem- 
perature of  the  wet-bulb  is  above  the  freezing  point :  it  must  be  subtracted  when  the 
temperature  is  below  the  freezing  point,  and  receives  the  sign  — .  This  correction  is  too 
important  to  be  neglected. 

The  second  correction,  less  important,  for  the  intermediate  differences  of  the  ther- 
B  13 


PSYCHROMETRICAL    TABLES. 

mometers,  which  are  greater  by  one  tenth  than  those  indicated  in  the  tables,  is  given 
in  the  horizontal  column  at  the  bottom  of  the  page.  It  is  constant  and  always  sub- 
tractive. 

Examples  of  Calculation. 

Difference  of  thermometers,  or  t  —  t1  =    0°.8. 

Temperature  of  the  wet-bulb  thermometer,  tf  =  11°.0. 
We  find,  page  18,  for  t  —  t',  fifth  double  column  ;  and  for  £',  first  column, 

The  force  of  vapor  in  the  air  —  *9mm'.31. 
Relative  humidity,  =  90. 


Difference  of  thermometers,  or  t  —  Z',  =    7°.2. 
Wet-bulb  thermometer,  or  t',  =  17°.9. 

We  find,  page  24,  for  *  —  *',=  7°.2,  and  t1  =  17°.0,  force  of  vapor  10mm-.02. 
Additive  correction  for  fraction  0°.9,  or  9  X  0.09  =   0     .81. 

Force  of  vapor  in  the  air  =  10     .83. 
Relative  humidity,  46 


Difference  of  thermometers,  t  —  t1  =    6°. 5. 
Wet-bulb  thermometer,  t'  =  23°.6. 

We  find,  page  23,  for  t'  =  23°.0,  and  t  —  t1,  or  difference,  =  6°.4,  force  of  vapor 
16mm .94 ;  applying  immediately  the  correction  found  at  the  bottom  of  the  page  for  one 
tenth  more  difference,  or  6°.4  -|-  0.1  =  6°.5,  we  have, 

Force  of  vapor  =  16mm\94  —  0.06,  or  16mm-.88. 

Additive  correction  for  fraction  0.6  of  the  wet-bulb,  6  X  0.13  =    0     .78. 

Force  of  vapor  in  the  air  =  17     .66. 
Relative  humidity,  56. 


The  wet-bulb  thermometer  covered  with  ice. 

Difference  of  thermometers,  t  — 1'=2°.8. 

Wet-bulb  thermometer  (ice),  t'=  — 8°.5. 

Page  17  gives  for  t  — 1'  =  2°.8,  and  t'  —  — 8°.0,  force  of  vapor  =  lmra-.0. 
Subtractive  correction  for  fraction  0.5  of  wet-bulb,  5  X  0.019=  — 0     .1. 

Force  of  vapor  in  the  air  =  0     .9. 
Relative  humidity,  30. 


B  14 


II.       PSYCHROMETRICAL    TABLES. 
Below  the  Freezing-Point ;  the  Bulb  covered  with  a  Film  of  Ice. 


"Wet- 

t  —  t',  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Bulb 
Thermo 
meter 

Mean 
Vertical 
Differ- 

o°.o 

0°.2 

O°.4 

0°.6 

0°.§ 

1°.O 

t' 

Centi- 

eachO°.l 

Rela- 

Rela- 

Rela- 

Rela- 

Rela 

Rela- 

grade 
Degrees 

Force  of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim 

Millim. 

Millim. 

-35 

0.22 

100 

0.12 

53 

-34 

0.003 

0.25 

100 

0.15 

58 

0.05 

18 

-33 

0.003 

0.27 

100 

0.17 

62 

0.07 

26 

-32 

0.003 

0.30 

100 

0.20 

66 

0.10 

33 

-31 

0.003 

0.34 

100 

0.24 

'  69 

0.14 

39 

0.03 

10 

0.004 

-30 

0.37 

100 

0.27 

71 

0.17 

44 

0.07 

17 

-29 

0.004 

0.41 

100 

0.31 

74 

0.21 

46 

0.11 

25 

-28 

0.004 

0.45 

100 

0.35 

76 

0.25 

53 

0.15 

31 

0.04 

9 

-27 

0.004 

0.49 

100 

0.39 

78 

0.29 

57 

0.19 

36 

0.09 

17 

-26 

0.005 

0.54 

100 

0.44 

80 

0.34 

60 

0.24 

41 

0.13 

23 

0.03 

6 

0.005 

-25 

0.59 

100 

0.49 

81 

0.39 

63 

0.29 

46 

0.18 

29 

0.08 

12 

-21 

0.005 

0.64 

100 

0.54 

82 

0.44 

66 

0.34 

50 

0.24 

34 

0.14 

19 

-23 

0.006 

0.70 

100 

0.60 

84 

0.50 

69 

0.40 

53 

0.30 

39 

0.19 

25 

-22 

0.006 

0.77 

100 

0.67 

85 

0.56 

71 

0.46 

57 

0.36 

44 

0.26 

31 

-21 

0.007 

0.84 

100 

0.74 

86 

0.63 

73 

0.53 

60 

0.43 

48 

0.33 

36 

0.003 

-20 

0.91 

100 

0.81 

87 

0.71 

75 

0.61 

63 

0.50 

51 

0.40 

40 

-19 

0.008' 

0.99 

100 

0.89 

88 

0.79 

77 

0.69 

66 

0.58 

55 

0.48 

45 

-18 

0.008 

.08 

100 

0.93 

89 

0.87 

78 

0.77 

68 

0.67 

58 

0.57 

48 

0.009 

-17 

.17 

100 

1.07 

90 

0.97 

80 

0.87 

70 

0.76 

61 

0.66 

52 

-16 

0.010 

.27 

100 

1.17 

90 

1.07 

81 

1.97 

72 

0.86 

63 

0.76 

55 

0.011 

-15 

.38 

100 

1.28 

91 

1.18 

82 

1.08 

74 

0.97 

66 

0.87 

58 

0.012 

-14 

.50 

100 

1.40 

92 

1.30 

83 

1.19 

76 

1.09 

68 

0.99 

61 

-13 

0.013 

.63 

100 

1.53 

92 

1.42 

84 

1.32 

77 

1.22 

70 

1.11 

63 

-12 

0.014 

.77 

100 

1.66 

93 

1.56 

85 

1.46 

78 

1.35 

71 

1.25 

65 

0.015 

-11 

.92 

100 

1.81 

93 

1.71 

86 

1.61 

80 

1.50 

73 

1.40 

67 

0.016 

-10 

2.08 

100 

1.97 

94 

1.87 

87 

1.77 

81 

1.66 

75 

1.56 

69 

-  9 

0.019 

2.26 

100 

2.16 

94 

2.05 

88 

1.95 

82 

1.85 

76 

1.74 

71 

-  8 

0.021 

2.46 

100 

2.35 

94 

2.25 

89 

2.14 

83 

2.04 

78 

1.94 

73 

-  7 

0.023 

2.67 

100 

2.56 

94 

2.46 

89 

2.35 

84 

2.25 

79 

2.15 

74 

-  6 

0.024 

2.89 

100 

2.79 

95 

2.68 

90 

2.58 

85 

2.47 

80 

2.37 

76 

0.025 

-  5 

3.13 

100 

3.03 

95 

2.92 

90 

2.82 

86 

2.71 

81 

2.61 

77 

-  4 

0.028 

3.39 

100 

3.28 

95 

3.18 

91 

3.07 

87 

2.97 

82 

2.86 

78 

-  3 

0.029 

3.66 

100 

3.56 

96 

3.45 

92 

3.35 

87 

3.24 

83 

3.14 

79 

—    9 

0.031 

3.96 

100 

3.85 

96 

3.75 

92 

3.64 

88 

3.54 

84 

3.43 

80 

-  1 

0.033 

4.27 

100 

4.16 

96 

4.06 

92 

3.95 

89 

3.85 

85 

3.74 

81 

-  0 

0.034 

4.60 

100 

4.50 

96 

4.40 

93 

4.29 

89 

4.19 

86 

4.08 

82 

Mean  Horizontal  Difference  of  Force  of  Yapor  for  each  0°.l  =  0.05  mm. 

B 


15 


PSYCHROMETRICAL    TABLES. 
Below  the  Freezing-Point ;  the  Bulb  covered  with  a  Film  of  Ice. 


t  —  t',  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Wet- 

Bulb 

Thermo- 

Vertical 

10  «1 

J.   •£ 

10  4. 

1°  6 

1°  S 

2°  O 

2°  2 

meter, 

Differ- 

• 

t' 

frvr 

Centi- 
grade 
Degrees. 

each  0°.l. 

Force  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force oJ 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force ol 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

-35 

-34 

-33 

-32 

-31 

-30 

-29 

-28 

-27 

-26 

-25 

-24 

0.04 

5 

-23 

0.006 

0.09 

12 

-22 

0.006 

0.16 

18 

0.05 

6 

-21 

0.007 

0.23 

24 

0.12 

13 

0.007 

-20 

0.30 

30 

0.20 

18 

0.09 

9 

-19 

0.008 

0.38 

34 

0.28 

25 

0.17 

15 

0.07 

6 

-18 

0.008 

0.46 

39 

0.36 

30 

0.26 

21 

0.16 

13 

0.05 

4 

-17 

0.009 

0.56 

43 

0.46 

35 

0.35 

26 

0.25 

18 

0.15 

11 

0.04 

3 

-16 

0.010 

0.66 

47 

0.56 

39 

0.45 

31 

0.35 

24 

0.25 

16 

0.14 

9 

0.011 

-15 

0.77 

50 

0.66 

43 

0.56 

36 

0.46 

29 

0.36 

22 

0.25 

15 

-14 

0.013 

0.88 

53 

0.78 

46 

0.68 

40 

0.58 

33 

0.47 

27 

0.37 

21 

-13 

0.013 

1.01 

56 

0.91 

50 

0.80 

43 

0.70 

37 

0.60 

31 

0.50 

25 

-12 

0.015 

1.15 

59 

.04 

53 

0.94 

47 

0.84 

41 

0.73 

35 

0.63 

30 

-11 

0.017 

1.30 

61 

.19 

55 

1.09 

50 

0.99 

44 

0.88 

39 

0.78 

34 

0.018 

-10 

1.46 

63 

.35 

58 

1.25 

52 

1.15 

47 

1.04 

42 

0.94 

38 

-  9 

0.019 

1.64 

66 

.53 

61 

1.43 

56 

1.33 

51 

1.22 

46 

1.12 

41 

-  8 

0.021 

1.83 

68 

.73 

63 

1.62 

58 

1.52 

54 

1.42 

49 

1.31 

45 

-  7 

0.023 

2.04 

69 

.94 

65 

1.83 

61 

1.73 

56 

1.63 

52 

1.52 

48 

-  6 

0.024 

2.26 

71 

2.16 

67 

2.06 

63 

1.95 

59 

1.85 

55 

1.74 

51 

0.025 

-  5 

2.50 

73 

2.40 

69 

2.30 

65 

2.19 

61 

2.09 

57 

1.98 

53 

-  4 

0.028 

2.76 

74 

2.65 

70 

2.55 

67 

2.45 

63 

2.34 

59 

2.24 

55 

-  3 

0.029 

3.03 

75 

2.93 

72 

2.82 

68 

2.72 

65 

2.61 

61 

2.51 

58 

-  2 

0.030 

3.33 

77 

3.22 

73 

3.12 

70 

3.01 

66 

2.91 

63 

2.80 

60 

-  1 

0.031 

3.64 

78 

3.53 

75 

3.43 

71 

3.32 

68 

3.22 

65 

3.11 

62 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.05  mm. 

B 


16 


PSYCHROMETRICAL    TABLES. 
Below  the  Freezing-Point ;  the  Bulb  covered  with  a  Film  of  Ice. 


t  —  t',  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Wet- 

Bulb 

1VI63.I1 

Thermo 
meter 

Vertical 
Differ- 

2°.4 

2°.6 

2°.8 

3°.0 

3°.2 

3°.4 

t' 

Centi- 
grade 
Degrees 

each  0°.l 

"orce  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force ol 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force ol 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

-15 

0.15 

9 

0.05 

3 

-14 

0.011 

0.27 

15 

0.16 

9 

0.06 

4 

-13 

0.013 

0.39 

20 

0.29 

14 

0.19 

9 

0.08 

4 

-12 

0.013 

0.53 

25 

0.42 

19 

0.32 

14 

0.22 

10 

0.11 

5 

-11 

0.015 

0.68 

29 

0.57 

24 

0.47 

19 

0.36 

15 

0.26 

10 

0.16 

6 

0.016 

-10 

0.83 

33 

0.73 

28 

0.63 

24 

0.52 

20 

0.42 

16 

0.32 

12 

-  9 

0.018 

1.02 

37 

0.91 

33 

0.81 

28 

0.70 

24 

0.60 

20 

0.50 

17 

-  8 

0.019 

1.21 

40 

1.10 

36 

1.00 

32 

0.90 

28 

C.79 

25 

0.69 

21 

-  7 

0.021 

1.42 

44 

1.31 

40 

1.21 

36 

1.11 

32 

1.00 

29 

0.90 

26 

-  6 

0.022 

1.64 

47 

1.54 

43 

1.43 

40 

1.33 

36 

1.22 

33 

1.12 

30 

0.024 

-  5 

1.88 

50 

1.77 

46 

1.67 

43 

1.57 

40 

1.46 

36 

1.36 

33 

-  4 

0.025 

2.13 

52 

2.03 

49 

1.92 

46 

1.82 

43 

1.71 

40 

1.61 

37 

-  3 

0.027 

2.40 

55 

2.30 

52 

2.19 

48 

2.09 

45 

1.99 

43 

1.88 

40 

_  2 

0.029 

2.70 

57 

2.59 

54 

2.49 

51 

2.38 

48 

2.28 

46 

2.17 

43 

-  1 

0.031 

3.01 

59 

2.90 

56 

2.80 

54 

2.69 

51 

2.59 

48 

2.48 

46 

3°.6 

3°.$ 

4°.0 

4°.2 

4°.4 

4°.6 

Millirn. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

-15 

-14 

-13 

-12 

-11 

0.05 

2 

0.016 

-10 

0.21 

8 

0.11 

4 

0.018 

-  9 

0.39 

13 

0.29 

9 

0.19 

6 

0.08 

3 

-  8 

0.019 

0.58 

18 

0.48 

14 

0.38 

11 

0.27 

8 

0.17 

5 

0.06 

2 

0.021 

-  7 

0-79 

22 

0.69 

19 

0.59 

16 

0.48 

13 

0.38 

10 

0.27 

7 

-  6 

0.022 

1.01 

26 

0.91 

23 

0.81 

20 

0.70 

17 

0.60 

15 

0.49 

12 

0.024 

- 

-  5 

0.025 

1.25 

30 

1.15 

27 

1.04 

24 

0.94 

22 

0.83 

19 

0.73 

16 

-  4 

1.50 

34 

1.40 

31 

1.30 

28 

1.19 

26 

1.09 

23 

0.98 

20 

0.027 

-  3 

1.78 

37 

1.67 

34 

1.57 

32 

1.46 

29 

1.36 

27 

1.25 

24 

0.029 

-  2 

0.031 

2.07 

40 

1.96 

37 

1.86 

35 

1.75 

33 

1.65 

30 

1.54 

28 

-  1 

2.38 

43 

2.27 

40 

2.17 

38 

2.06 

36 

1.96 

34 

1.85 

31 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.05  mm. 

B 


17 


PSYCHROMETRICAL    TABLES. 


t  —  t',  Difference  of  Wet  and  Dry-Bulb  Thermometers. 

Wet- 

Bulb 

Mean 

Thermo 

Vertical 

o°.o 

O°.2 

0°.4 

0°.6 

O°.8 

1°.0 

meter. 

Differ- 

t' 
Centi- 

ence for 

grade 

eachO°.l 

Rela- 

Rela 

Rela- 

Rela- 

Rela- 

Degrees 

Force  of 
Vapor. 

Relative 
Humid 
ity. 

Force  of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

live 
Hu- 
mid 

Force  of 
Vapor. 

tive 
Hu- 

mid- 

Force  of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

4.60 

100 

4.48 

96 

4.36 

92 

4.24 

88 

4.12 

85 

4.01 

81 

1 

0.03 

4.94 

100 

4.82 

96 

4.70 

93 

4.58 

89 

4.46 

85 

4.35 

82 

2 

0.04 

5.30 

100 

5.18 

96 

5.06 

93 

4.94 

89 

4.83 

86 

4.71 

83 

3 

0.04 

5.69 

100 

5.57 

97 

5.45 

93 

5.33 

90 

5.21 

87 

5.09 

83 

4 

0.04 

6.10 

100 

5.98 

97 

5.86 

93 

5.74 

90 

5.62 

87 

5.50 

84 

5 

0.04 

6.53 

100 

6.41 

97 

6.29 

94 

6.17 

91 

6.05 

88 

5.94 

85 

0.05 

6 

7.00 

100 

6.88 

97 

6.76 

94 

6.64 

91 

6.52 

88 

6.40 

85 

7 

0.05 

7.49 

100 

7.37 

97 

7.25 

94 

7.13 

91 

7.01 

89 

6.89 

86 

8 

0.05 

8.02 

100 

7.90 

97 

7.78 

94 

7.66 

92 

7.54 

89 

7.42 

86 

9 

0.06 

8.57 

100 

8.45 

97 

8.33 

95 

8.21 

92 

8.09 

89 

7.97 

86 

10 

0.06 

9.17 

100 

9.04 

97 

8.92 

95 

8.80 

93 

8.68 

90 

8.56 

87 

0.06 

11 

9.79 

100 

9.67 

97 

9.55 

95 

9.43 

93 

9.31 

90 

9.19 

88 

12 

0.07 

10.46 

100 

10.34 

98 

10.21 

95 

10.09 

93 

9.97 

90 

9.85 

88 

13 

0.07 

11.16 

100 

11.04 

98 

10.92 

05 

10.80 

93 

10.68 

91 

10.56 

89 

14 

0.07 

11.91 

100 

11.79 

98 

11.66 

95 

11.54 

93 

11.42 

91 

11.30 

89 

15 

0.08 

12.70 

100 

12.58 

98 

12.46 

96 

12.33 

93 

12.21 

91 

12.09 

89 

0.08 

16 

13.54 

100 

13.41 

98 

13.29 

96 

13.17 

94 

13.05 

92 

12.93 

90 

0.09 

17 

14.42 

100 

14.30 

98 

14.18 

96 

14.05 

94 

13.93 

92 

13.81 

90 

18 

0.09 

15.36 

100 

15.23 

98 

15.11 

96 

14.99 

94 

14.87 

92 

14.75 

90 

0.10 

19 

16.35 

100 

16.22 

98 

16.10 

96 

15.98 

94 

15.86 

92 

15.73 

91 

20 

0.10 

17.39 

100 

17.27 

98 

17.15 

96 

17.02 

94 

16.90 

92 

16.78 

91 

0.11 

21 

18.50 

100 

18.37 

98 

18.25 

96 

18.13 

94 

18.00 

92 

17.88 

91 

22 

0.12 
0.12 

19.66 

100 

19.54 

98 

19.41 

96 

19.29 

95 

19.17 

93 

19.04 

91 

23 

20.89 

100 

20.76 

98 

20.64 

96 

20.52 

95 

20.39 

93 

20.27 

91 

24 

0.13 

22.18 

100 

22.06 

98 

21.94 

97 

21.81 

95 

21.69 

93 

21.57 

92 

25 

0.14 

23.55 

100 

23.43 

98 

23.30 

97 

23.18 

95 

23.05 

93 

22.93 

92 

0.14 

26 

24.99 

100 

24.86 

98 

24.74 

97 

24.62 

95 

24.49 

93 

24.37 

92 

0.15 

27 

0.16 

26.51 

100 

26.38 

98 

26.26 

.97 

26.13 

95 

26.01 

93 

25.88 

92 

28 

0.17 

28.10 

100 

27.98 

98 

27.85 

97 

27.73 

95 

27-60 

93 

27.48 

92 

29 

0.18 

29.78 

100 

29.66 

98 

29.53 

97 

29.41 

95 

29.28 

94 

29.16 

92 

30 

31.55 

100 

31.42 

98 

31.30 

97 

31.17 

95 

30.05 

94 

30.92 

93 

0.19 

31 

0.20 

33.40 

100 

33.28 

98 

33.15 

97 

33.03 

96 

32.90 

94 

32.78 

93 

32 

0.21 

35.36 

100 

35.23 

99 

35.11 

97 

34.98 

96 

34.86 

94 

34.73 

93 

33 

0.22 

37.41 

100 

37.28 

99 

37.16 

98 

37.03 

96 

36.91 

94 

36.78 

93 

34 

0.23 

39.56 

100 

39.43 

99 

39.31 

98 

39.18 

96 

39.06 

94 

38.93 

93 

35 

41.83 

100 

41.70 

99 

41.58 

98 

41.45 

96 

41.33 

95 

41.20 

93 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.06  mm. 

18 


PSYCHROMETRICAL    TABLES. 


t  —  t  ,  Difference  of  Wet  and  Dry  -Bulb  Thermometers. 

Wet- 

Bulb 

Mean 

Thermo 

Vertical 

•m  o  £ 

1°»4: 

1°«6 

1°»8 

2°.O 

2°*2 

meter. 

»   t' 

Differ- 

Centi- 
grade 
Degrees 

ence  for 
eachOM. 

Force  of 
Vapor. 

Relative 
Humid- 
ity. 

Force  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

3.89 

78 

3.77 

74 

3.65 

71 

3.53 

67 

3.41 

64 

3.29 

61 

0.03 

1 

0.04 

4.23 

79 

4.11 

75 

3.99 

72 

3.87 

69 

3.75 

66 

3.63 

63 

2 

4.59 

80 

4.47 

76 

4.35 

73 

4.23 

70 

4.11 

67 

3.99 

65 

0.04 

3 

4.97 

80 

4.85 

77 

4.73 

74 

4.61 

71 

4.49 

69 

4.37 

66 

0.04 

4 

0.04 

5.38 

81 

5.26 

•  78 

5.14 

75 

5.02 

73 

4.90 

70 

4.78 

67 

5 

5.82 

82 

5.70 

79 

5.58 

77 

5.46 

74 

5.34 

71 

5.22 

69 

0.05 

6 

0.05 

6.28 

83 

6.16 

80 

6.04 

77 

5.92 

75 

5.80 

72 

5.68 

70 

7 

0.05 

6.77 

83 

6.65 

81 

6.53 

78 

6.41 

76 

6.29 

73 

6.17 

71 

8 

0.06 

7.29 

84 

7.17 

81 

7.05 

79 

6.93 

76 

6.81 

74 

6.69 

72 

9 

0.06 

7.85 

84 

7.73 

82 

7.61 

80 

7.49* 

77 

7-37 

75 

7.25 

73. 

10 

8.44 

85 

8.32 

83 

8.20 

80 

8.08 

78 

7.96 

76 

7.84 

74 

0.06 

11 

0.07 

9.07 

86 

8.95 

83 

8.82 

81 

8.70 

79 

8.58 

77 

8.46 

75 

12 

0.07 

9.73 

86 

9.61 

84 

9.49 

82 

9.37 

80 

9.25 

78 

9.12 

76 

13 

0.08 

10.43 

86 

10.31 

84 

10.19 

82 

10.07 

80 

9.95 

78 

9.83 

76 

14 

0.08 

11.18 

87 

11.06 

85 

10.94 

83 

10.81 

81 

10.69 

79 

10.57 

77 

15 

11.97 

87 

11.85 

85 

11.73 

83 

11.60 

81 

11.48 

80 

11.36 

78 

0.08 

16 

,  0.09 

12.80 

88 

12.68 

86 

12.56 

84 

12.44 

82 

12.32 

80 

12.19 

78 

17 

0.09 

13.69 

88 

13.57 

86 

13.44 

84 

13.32 

83 

13.20 

81 

13.08 

79 

18 

0.10 

14.62 

88 

14.50 

87 

14.38 

85 

14.26 

83 

14.13 

81 

14.01 

80 

19 

15.61 

89 

15.49 

87 

15.37 

85 

15.24 

83 

15.12 

82 

15.00 

80 

20 

0.11 

16.65 

89 

16.53 

87 

16.41 

86 

16.29 

84 

16.16 

82 

16.04 

81 

0.11 

21 

0.12 

17.76 

89 

17.63 

88 

17.51 

86 

17.39 

84 

17.27 

83 

17.14 

81 

22 

0.12 

18.92 

90 

18.80 

88 

18.67 

86 

18.55 

85 

18.43 

83 

18.30 

82 

23 

0.13 

20.15 

90 

20.02 

88 

19.90 

87 

19.78 

85 

19.65 

83 

19.53 

82 

24 

21.44 

90 

21.32 

88 

21.20 

87 

21.07 

85 

20.95 

84 

20.82 

82 

0.1-1 

25 

22.81 

90 

22.68 

89 

22.56 

87 

22.44 

86 

22.31 

84 

22.19 

83 

0.14 

26 

0.15 

24.24 

90 

24.12 

89 

23.99 

87 

23.87 

86 

23.75 

85 

23.62 

83 

27 

0.16 

25.76 

91 

25.63 

89 

25.51 

88 

25.39 

86 

25.26 

85 

25.14 

83 

28 

0.17 

27.35 

91 

27.23 

89 

27.10 

88 

26.98 

87 

26.86 

85 

26.73 

84 

29 

0.18 

29.03 

91 

28.91 

90 

28.78 

88 

28.66 

87 

28.53 

85 

28.41 

84 

30 

30.80 

91 

30.67 

90 

30.55 

89 

30.42 

87 

30.30 

86 

30.17 

84    : 

0.19 

31 

0.20 

32.65 

91 

32.53 

90 

32.40 

89 

32.28 

87 

32.15 

86 

32.03 

85 

32 

0.21 

34.61 

91 

34.48 

90 

34.36 

89 

34.23 

88 

34.11 

86 

33.98 

85 

33 

0.22 

36.66 

92 

36.53 

90 

36.41 

89 

36.28 

88 

36.16 

86 

36.03 

85 

34 

0.23 

38.81 

92 

38.68 

90 

38.56 

89 

38.43 

88 

38.31 

87 

38.18 

85 

35 

41.07 

92 

40.94 

91 

40.82 

89 

40.69 

88 

40.57 

87 

40.44 

86 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  O'.l  =  0.06  mm. 

B 


19 


PSYCHROMETRICAL    TABLES. 


t  —  t',  Difference  of  Wet  and  Dry-Bulb  Thermometers. 

Wet- 

Bulb 

Mean 

Thermo- 

Vertical 

2°.4: 

2°.6 

2°.8 

3°.0 

3°.2 

3°.4 

meter. 
•ft 

Differ- 

Centi- 
grade 
Degrees. 

ence  for 
eachO°.l. 

Force  of 
Vapor. 

Relative 
Humid- 
ity. 

Force  of 
Vapor. 

Rela- 
live 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

3.17 

58 

3.06 

55 

2.94 

52 

2.82 

50 

2.70 

47 

2.58 

44 

1 

0.03 

3.51 

60 

3.39 

57 

3.27 

54 

3.16 

52 

3.04 

49 

2.92 

47 

2 

0.04 

3.87 

62 

3.75 

59 

3.63 

56 

3.51 

54 

3.39 

51 

3.28 

49 

3 

0.04 

4.25 

63 

4.13 

61 

4.02 

58 

3.90 

56 

3.78 

53 

3.66 

51 

4 

0.04 

4.66 

65 

4.54 

62 

4.42 

60 

4.30 

57 

4.18 

55 

4.06 

53 

5 

0.04 

5.10 

66 

4.98 

64 

4.86 

61 

4.74 

59 

4.62 

57 

4.50 

55 

0.05 

6 

5.56 

67 

5.44 

65 

5.32 

63 

5.20 

61 

5.08 

58 

4.96 

56 

7 

0.05 

6.05 

69 

5.93 

66 

5.81 

64 

5.69 

62 

5.57 

60 

5.45 

58 

8 

0.05 

6.57 

70 

6.45 

68 

6.33 

65 

6.21 

63 

6.09 

61 

5.97 

59 

9 

0.06 

7.13 

71 

7.01 

69 

6.89 

67 

6.77 

65 

6.64 

63 

6.52 

61 

10 

0.06 

7.72 

72 

7.59 

70 

7.47 

68 

7.35 

66 

7.23 

64 

7.11 

62 

0.06 

11 

8.34 

73 

8.22 

71 

8.10 

69 

7.98 

67 

7.86 

65 

7.74 

63 

12 

0.07 

9.00 

74 

8.88 

72 

8.76 

70 

8.64 

68 

8.52 

66 

8.40 

64 

13 

0.07 

9.71 

75 

9.58 

73 

9.46 

71 

9.34 

69 

9.22 

67 

9.10 

66 

14 

0.07 

10.45 

75 

10.33 

73 

10.21 

72 

10.08 

70 

9.96 

68 

9.84 

67 

15 

0.08 

11.24 

76 

11.12 

74 

10.99 

72 

10.87 

71 

10.75 

69 

10.63 

67 

0.08 

16 

12.07 

77 

11.95 

75 

11.83 

73 

11.71 

72 

11.58 

70 

11.46 

68 

17 

0.09 

12.95 

77 

12.83 

76 

12.71 

74 

12.59 

72 

12.47 

71 

12.34 

69 

18 

0.09 

13.89 

78 

13.77 

76 

13.64 

75 

13.52 

73 

13.40 

72 

13.28 

70 

19 

0.10 

14.87 

78 

14.75 

77 

14.63 

75 

14.51 

74 

14.38 

72 

14.26 

71 

20 

0.10 

15.92 

79 

15.79 

77 

15.67 

76 

15.55 

74 

15.43 

73 

15.30 

72 

0.11 

21 

17.02 

80 

16.90 

78 

16.77 

77 

16.65 

75 

16.53 

74 

16.40 

72 

22 

0.12 

18.18 

80 

18.06 

79 

17.93 

77 

17.81 

76 

17.69 

74 

17.56 

73 

23 

0.12 

19.41 

80 

19.28 

79 

19.16 

78 

19.04 

76 

18.91 

75 

18.79 

73 

24 

0.13 

20.70 

81 

20.58 

79 

20.45 

78 

20.33 

77 

20.21 

75 

20.08 

74 

25 

0.14 

22.06 

81 

21.94 

80 

21.82 

79 

21.69 

77 

21.57 

76 

21.45 

75 

0.14 

26 

.  23.50 

82 

23.37 

80 

23.25 

79 

23,13 

78 

23.00 

77 

22.88 

75 

27 

0.15 

25.01 

82 

24.89 

81 

24.76 

79 

24.64 

78 

24.51 

77 

24.39 

76 

28 

0.16 

26.61 

83 

26.48 

81 

26.36 

80 

26.23 

79 

26.11 

77 

25.98 

76 

29 

0.17 

28.28 

83 

28.16 

81 

28.03 

80 

27.91 

79 

27.69 

77 

27.76 

76 

30 

0.18 

30.05 

83 

29.92 

82 

29.80 

81 

29.67 

79 

29.55 

78 

29.42 

77 

0.19 

31 

31.90 

83 

31.78 

82 

31.65 

81 

31.53 

80 

31.40 

78 

31.28 

77 

32 

0.20 

33.86 

84 

33.73 

82 

33.61 

81 

33.48 

80 

33.36 

79 

33.23 

78 

33 

0.21 

35.90 

84 

35.77 

83 

35.65 

81 

35.52 

80 

35.40 

79 

35.27 

78 

34 

0.22 

38.06 

84 

37.93 

83 

37.81 

82 

37.68 

81 

37.56 

80 

37.43 

78 

35 

0.23 

40.31 

84 

40.18 

83 

40.06 

82 

39.93 

81 

39.81 

80 

39.68 

79 

Blean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.06  mm. 

B 


20 


PSYCHROMETRICAL    TABLES. 


Wet- 

t  —  t',  Difference  of  Wet  and  Dry-Bulb  Thermometers. 

Bulb 
Thermo- 

Mean 
Vertical 

3°.6 

3°.8 

4°.0 

4°.2 

4°.4 

4°.6 

meter. 
g/ 

Differ- 

Centi- 
grade 
Degrees. 

ence  for 
eachO°.l. 

Force  of 
Vapor. 

Relative 
Humid- 
ity. 

Torce  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

2.46 

41 

2.34 

39 

2.22 

36 

2.11 

34 

1.99 

32 

1.87 

29 

1 

0.03 

2.80 

44 

2.68 

42 

2.56 

39 

2.44 

37 

2.32 

35 

2.20 

32 

2 

0.04 

3.16 

46 

3.04 

44 

2.92 

42 

2.80 

39 

2.68 

37 

2.56 

35 

3 

0.04 

3.54 

49 

3.42 

46 

3.30 

44 

3.18 

42 

3.06 

40 

2.94 

38 

4 

0.04 

3.94 

51 

3.82 

48 

3.71 

46 

3.59 

44 

3.47 

42 

3.35 

40 

5 

0.04 

4.38 

52 

4.26 

50 

4.14 

48 

4.02 

46 

3.90 

44 

3.78 

42 

0.05 

6 

4.84 

54 

4.72 

52 

4,60 

50 

4.48 

48 

4.36 

46 

4.24 

44 

7 

0.05 

5.33 

56 

5.21 

54 

5.09 

52 

4.97 

50 

4.85 

48 

4.73 

46 

8 

0.05 

5.85 

57 

5.73 

56 

5.61 

54 

5.49 

52 

5.37 

50 

5.25 

48 

9 

0.06 

6.40 

59 

6.28 

57 

6.16 

55 

6.04 

53 

5.92 

52 

5.80 

50 

10 

0.06 

6.99 

60 

6.87 

58 

6.75 

57 

6.63 

55 

6.51 

53 

6.39 

52 

0.06 

11 

7.61 

61 

7.49 

60 

7.37 

58 

7.25 

56 

7.13 

55 

7.01 

53 

12 

0.07 

8.28 

62 

8.15 

61 

8.03 

59 

7.91 

58 

7-79 

56 

7.67 

55 

13 

0.07 

f\  f\r*f 

8.98 

64 

8.85 

63 

8.73 

61 

8.61 

59 

8.49 

57 

8.37 

56 

14 

U.U7 

9.72 

65 

9.60 

63 

9.48 

62 

9.35 

60 

9.23 

59 

9.11 

57 

15 

0.08 

10.51 

66 

10.38 

64 

10.26 

63 

10.14 

61 

10-02 

60 

9.90 

58 

0.08 

16 

11.34 

67 

11.22 

65 

11.10 

64 

10.97 

62 

10-85 

61 

10.73 

59 

0.09 

17 

12.22 

68 

12.10 

67 

11.98 

65 

11.85 

63 

11-73 

62 

11.61 

61 

18 

0.09 

13.15 

69 

13.03 

67 

12.91 

66 

12.79 

64 

12-66 

63 

12.54 

62 

19 

0.10 

14.14 

69 

W.02 

68 

13.89 

66 

13.77 

65 

13-65 

64 

13.53 

62 

20 

0.11 

15.18 

70 

15.06 

69 

14.94 

67 

14.81 

66 

14-69 

65 

14.57 

63 

o.n 

21 

16.28 

71 

16.16 

69 

16.04 

68 

15.91 

67 

15-79 

65 

15.67 

64 

22 

0.12 

17.44 

71 

17.32 

70 

17.20 

69 

17.07 

67 

16-95 

66 

16.83 

65 

0.12 

23 

01  *3 

18.67 

72 

18.54 

71 

18.42 

69 

18.30 

68 

18-17 

67 

18.05 

66 

24 

•  lo 

19.96 

73 

19.84 

71 

19.71 

70 

19.59 

69 

19-46 

68 

19.34 

66 

25 

0.14 

21.32 

73 

21.20 

72 

21.07' 

71 

20.95 

70 

20.83 

68 

20.70 

6T 

0.14 

26 

22.75 

74 

22.63 

73 

22.50 

71 

22.38 

70 

22.26 

69 

22.13 

68 

27 

0.15 

0.16 

24.27 

74 

24.14 

73 

24.02 

72 

23.89 

71 

23.77 

70 

23.64 

68 

28 

0.17 

25.86 

75 

25.73 

74 

25.61 

72 

25.48 

71 

25.36 

70 

25.24 

69 

29 

0.18 

27.44 

75 

27.31 

74 

27.29 

73 

27.16 

72 

27.04 

71 

26.91 

70 

30 

29.30 

76 

29.17 

75 

29.05 

73 

28.92 

72 

28.80 

71 

28.67 

70 

0.19 

31 

0.20 

31.15 

76 

31.03 

75 

30.90 

74 

30.78 

73 

30.65 

72 

30.53 

71 

32 

0.21 

33.10 

77 

32.97 

76 

32.85 

75 

32.72 

73 

32.60 

72 

32.47 

71 

33 

0.22 

35.15 

77 

35.02 

76 

34.90 

75 

34.77 

74 

34.65 

73 

34.52 

72 

34 

0.23 

37.30 

77 

37.17 

76 

37.05 

75 

36.92 

74 

36.80 

73 

36.67 

72 

35 

39.56 

78 

39.43 

77 

39.31 

76 

39.18 

74 

39.06 

73 

38.98 

72 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  OM  =  0  06  mm. 

B 


PSYCHROMETRICAL    TABLES. 


t  —  t';  Difference  of  Wet  and  Dry  -Bulb  Thermometers. 

Wet- 

Bulb 

Mean 

Thermo- 

Vertical 

4°.  8 

5°.0 

5°.  2 

5°.4 

5°.6 

5°.S 

meter, 
f 

Differ- 

Centi- 
grade 
Degrees. 

ence  for 
eachOM. 

Force  of 
Vapor. 

Relative 
Humid- 
ity. 

Force  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

1.75 

27 

1.63 

25 

1.51 

23 

1.39 

21 

1.27 

19 

1.15 

17 

1 

0.03 

2.08 

30 

1.97 

28 

1.85 

26 

1.73 

24 

1.61 

22 

1.49 

20 

2 

0.04 

2.44 

33 

2.32 

31 

2.20 

29 

2.08 

27 

1.96 

25 

1.85 

23 

3 

0.04 

2.82 

36 

2.70 

34 

2.58 

32 

2.46 

30 

2.34 

28 

2.22 

26 

4 

0.04 

3.23 

38 

3.11 

36 

2.99 

34 

2.87 

33 

2.75 

31 

2.63 

29 

0.04 

5 

3.66 

40 

3.54 

39 

3.42 

37 

3.30 

35 

3.18 

33 

3.06 

32 

0.05 

6 

4.12 

43 

4.00 

41 

3.88 

39 

3.76 

37 

3.64 

36 

3.52 

34 

7 

0.05 

4.61 

45 

4.49 

43 

4.37 

41 

4.25 

40 

4.13 

38 

4.01 

36 

8 

0.05 

5.13 

47 

5.01 

45 

4.89 

43 

4.77 

42 

4.65 

40 

4.53 

39 

9 

0.06 

5.68 

48 

5.56 

47 

5.44 

45 

5.32 

44 

5.20 

42 

5.08. 

41 

10 

0.06 

6.27 

50 

6.15 

48 

6.02 

47 

5.90 

45 

5.78 

44 

5.66 

42 

0.06 

11 

6.89 

52 

6.77 

50 

6.65 

49 

6.53 

47 

6.40 

46 

6.28 

44 

12 

0,07 

7.55 

53 

7.43 

52 

7.31 

50 

7.18 

49 

7.06 

47 

6.94 

46 

13 

0.07 

8.25 

55 

8.13 

53 

8.01 

52 

7.88 

50 

7.76 

49 

7.64 

47 

14 

0.07 

8.'99 

56 

8.87 

54 

8.75 

53 

8.62 

51 

8.50 

50 

8.38 

49 

15 

0.08 

9.78 

57 

9.65 

55 

9.53 

54 

9.41 

53 

9.29 

51 

9.17 

50 

0.08 

16 

10.61 

58 

10.49 

57 

10.36 

55 

10.24 

54 

10.12 

53 

10.00 

51 

17 

0.09 

11.49 

59 

11.37 

58 

11.24 

56 

11.12 

55 

11.00 

54 

10.88 

53 

18 

0.09 

12.42 

60 

12.30 

59 

12.17 

58 

12.05 

56 

11.93 

55 

11.81 

54 

19 

0.10 

13.40 

61 

15.28 

60 

13.16 

59 

13.04, 

57 

12.91 

56 

12.79 

55 

20 

0.11 

14.44 

62 

14.32 

61 

14.20 

60 

14.08 

58 

13.95 

57 

13.83 

56 

0.11 

21 

15.54 

63 

15.42 

62 

15.30 

60 

15.17 

59 

15.05 

58 

14.93 

57 

22 

0.12 

16.70 

64 

16.58 

63 

16.46 

61 

16.33 

60 

16.21 

59 

16.09 

58 

23 

0.12 

17.93' 

65 

17.80 

63 

17.68 

62 

17.56 

61 

17.43 

60 

17.31 

59 

24 

0.13 

19.22 

65 

19.09 

64 

18.97 

63 

18.85 

62 

18.72 

61 

18.60 

60 

25 

0.14 

20.58 

66 

20.46 

65 

20.33 

64 

20.21 

63 

20.08 

62 

19.96 

60 

0.14 

26 

22.01 

67 

21.88 

65 

21.76 

64 

21.63 

63 

21.51 

62 

21.39 

61 

27 

0.15 

23.52 

67 

23.40 

66 

23.27 

65 

23.15 

64 

23.02 

63 

22.90 

62 

28 

0.16 

25.11 

68 

24.99 

67 

24.86 

66 

24.74 

65 

24.61 

64 

24.49 

63 

29 

0.17 

26.79 

68 

26.66 

67 

26.54 

66 

26.41 

65 

26.29 

64 

26.16 

63 

30 

0.1S 

28.55 

69 

28.42 

68 

28.30 

67 

28.17 

66 

28.05 

65 

27.92 

64 

0.19 

31 

30.40 

70 

30.28 

69 

30.15 

68 

30.03 

67 

29.90 

66 

29.78 

65 

32 

0.20 

32.35 

70 

32.22 

69 

32.10 

68 

31.97 

67 

31.85 

66 

31.72 

65 

33 

0.21 

34.40 

71 

34.27 

70 

34.15 

69 

34.02 

68 

33.90 

67 

33.77 

66 

34 

0.22 

36.55 

71 

36.42 

70 

36.30 

69 

36.17 

68 

36.05 

67 

35.92 

66 

35 

0.23 

38.80 

71 

38.68 

70 

.     Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  O'.l  =  0.06  mm. 

B 


PSYCHROMETRICAL    TABLES. 


t  —  t',  Difference  of  Wet  and  Dry  -Bulb  Thermometers. 

Wet- 

Bulb 

Mean 

Thermo 

Vertical 

6°.O 

6°.2 

6°.4 

6°.6 

6°.8 

7°.O 

meter, 
t' 

Differ- 

Centi- 
grade 
Degrees 

ence  for 
eachOM 

Force  of 
Vapor. 

Relative 
Humid 
ity. 

Force  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force o 
Vapor. 

Rela 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela 
tive 
Hu- 
mid- 

Force o 
Vapor. 

Rela 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.03 

1.04 

15 

0.92 

13 

0.80 

11 

0.68 

9 

0.56 

8 

0.44 

6 

1 

0.04 

1.37 

18 

1.25 

16 

1.13 

15 

1.01 

13 

0.89 

11 

0.78 

10 

2 

0.04 

1.73 

22 

1.61 

20 

1.49 

18 

1.37 

16 

1.25 

15 

1.13 

13 

3 

0.04 

2.11 

25 

1.99 

23 

1.87 

21 

1.75 

19 

1.63 

18 

1.51 

16 

4 

0.04 

2.51 

28 

2.39 

26 

2.27 

24 

2.15 

23 

2.03 

21 

1.91 

19 

5 

2.94 

30 

2.82 

28 

2.70 

27 

2.58 

25' 

2.46 

24 

2.34 

22 

0.05 

6 

0.05 

3.40 

33 

3.28 

31 

3.16 

29 

3.04 

28 

2.92 

26 

2.80 

25 

7 

0.05 

3.89 

35 

3.77 

33 

3.65 

32 

3.53 

30 

3.41 

29 

3.29 

28 

8 

0.06 

4.41 

37 

4.28 

35 

4.16 

34 

4.04 

33 

3.92 

31 

3.80 

30 

9 

0.06 

4.96 

39 

4.84 

38 

4.71 

36 

4.59 

35 

4-47 

33 

4.35 

32 

10 

5.54 

41 

5.42 

40 

5.30 

38 

5.18 

37 

5.06 

35 

4.94 

34 

0.06 

11 

0.07 

6.16 

43 

6.04 

41 

5.92 

40 

5.80 

39 

5.68 

37 

5.56 

36 

12 

0.07 

6.82 

44 

6.70 

43 

6.58 

42 

6.46 

41 

6.34 

39 

6.22 

38 

13 

0.07 

7.52 

46 

7.40 

45 

7.28 

43 

7.16 

42 

7.03 

41 

6.91 

40 

14 

0.08 

8.26 

47 

8.14 

46 

8.02 

45 

7.90 

44 

7.77 

43 

7.65 

41 

}5 

9.05 

49 

8.92 

48 

8.80 

46 

8.68 

45 

8.56 

44 

8.44 

43 

0.08 

16 

0.09 

9.88 

50 

9.75 

49 

9.63 

48 

9.51 

47 

9.39 

45 

9.27 

44 

17 

0.09 

10.76 

52 

10.63 

50 

10.51 

49 

10.39 

48 

10.27 

47 

10.14 

46 

18 

0.10 

11.69 

53 

11.56 

51 

11.44 

50 

11.32 

49 

11.20 

48 

11.07 

47 

19 

0.11 

12.67 

54 

12.55 

53 

12.42 

51 

12.30 

50 

12.18 

49 

12.06 

48 

20 

13.71 

55 

13.58 

54 

13.46 

53 

13.34 

52 

13.22 

50 

13.09 

49 

0.11 

21 

0.12 

14.81 

56 

14.68 

55 

14.56 

54 

14.44 

53 

14.31 

52 

14.19 

51 

22 

0.12 

15.96 

57 

15.84 

56 

15.72 

55 

15.59 

54 

15.47 

53 

15.35 

52 

23 

0.13 

17.19 

58 

17.06 

57 

16.94 

56 

16.82 

55 

16.69 

54 

16.57 

53 

24 

0.14 

18.48 

59 

18.35 

58 

18.23 

56 

18.11 

55 

17.98 

54. 

17.86 

53 

25 

19.84 

59 

19.71 

58 

19.59 

57 

19.46 

56 

19.34 

55 

19.22 

54 

0.14 

26 

0.15 

21.26 

60 

21.14 

59 

21.01 

58 

20.89 

57 

20.77 

56 

20.64 

55 

27 

0.16 

22.77 

61 

22.65 

60 

22.52 

59 

22.40 

58 

22.28 

57 

22.15 

56 

28 

0.17 

24.36 

62 

24.24 

61 

24.11 

60 

23.99 

59 

23.86 

58 

23.74 

57 

29 

0.18 

26.04 

62 

25.91 

61 

25.79 

60 

25.66 

59 

25.54 

58 

25.41 

57 

30 

27.80 

63 

27.67 

62 

27.55 

61 

27.42 

60 

27.30 

59 

27.17 

58 

0.19 

31 

0.20 

29.65 

64 

29.53 

63 

29.40 

62 

29.28 

61 

29.15 

60 

29.03 

59 

32 

0.21 

31.59 

64 

31.47 

63 

31.34 

62 

31.22 

61 

31.09 

60 

30.97 

59 

33 

33.64 

65 

33.51 

64 

33.39 

63 

33.26 

62 

33.14 

61 

33.01 

60 

34 

i 

35 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  OM  =  0.06  mm. 

10 


PSYCHROMETRICAL    TABLES. 


t  —  t',  Difference  of  Wet  and  Dry-Bulb  Thermometers. 

Wet- 

Bulb 

Mean 

Thermo 

Vertical 

i°Ji 

7°.4 

7°.6 

7°.8 

8°.0 

8°.2 

meter, 
t/ 

Differ- 

Centi- 
grade 
Degrees 

ence  for 
eachO°.l 

Force  of 
Vapor. 

Relativ 
Humid 
ity. 

Force  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force o 
Vapor. 

Rela 
live 
Hu- 
mid 

Force  o 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force o 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force o 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Millim. 

Millim. 

Millim. 

Millim 

Millim. 

Millim. 

Millim 

0 

0.32 

4 

0.20 

3 

0.09 

1 

1 

0.03 

0.66 

8 

0.54 

7 

0.42 

5 

0.30 

4 

0.18 

2 

0.06 

1 

2 

0.04 

1.01 

12 

0.89 

10 

0.77 

9 

0.65 

7 

0.53 

6 

0.41 

4 

3 

0.04 

1.39 

15 

1.27 

13 

1.15 

12 

1.03 

11 

0.91 

9 

0.79 

8 

4 

0.04 

1.79 

18 

1.67 

16 

1.55 

15 

1.43 

14 

1.31 

13 

1.19 

11 

5 

0.04 

2.22 

24 

2.10 

19 

1.98 

18 

1.86 

17 

1.74 

16 

1.62 

14 

0.05 

6 

2.78 

24 

2.66 

23 

2.44 

21 

2.32 

20 

2.20 

18 

2.08 

17 

7 

0.05 

3.16 

26 

3.04 

25 

2.92 

24 

2.80 

22 

2.68 

21 

2.56 

20 

8 

0.05 

3.68 

29 

3.56 

27 

3.44 

26 

3.32 

25 

3.20 

24 

3.08 

22 

9 

0.06 

4.23 

31 

4.11 

30 

3.99 

28 

3.87 

27 

3.75 

26 

3.63 

25 

10 

0.06 

4.82 

33 

4.70 

32 

4.57 

30 

4.45 

29 

4.33 

28 

4.21 

27 

0.06 

11 

5.44 

35 

5.32 

34 

5.19 

32 

5.07 

31 

4.95 

30 

4.83 

29 

12 

0.07 

6.09 

37 

5.97 

36 

5.85 

34 

5.73 

33 

5.61 

32 

5.49 

31 

13 

0.07 

6.79 

39 

6.67 

37 

6.55 

36 

6.43 

35 

6.31 

34 

6.18 

33 

14 

0.07 

7.53 

40 

7.41 

39 

7.29 

38 

7.17 

37 

7.04 

36 

6.92 

35 

15 

0.08 

8.31 

42 

8.19 

41 

8.07 

40 

7.95 

39 

7.83 

37 

7.71 

36 

0.08 

* 

16 

9.14 

43 

9.02 

42 

8.90 

41 

8.78 

40 

8.66 

39 

8.53 

38 

17 

0.09 

10.02 

45 

9.90 

44 

9.78 

43 

9.C6 

42 

9.53 

40 

9.41 

39 

18 

0.09 

10.95 

46 

10.83 

45 

10.71 

44 

10.58 

43 

10.46 

42 

10.34 

41 

19 

0.10 

11.93 

47 

11.81 

46 

11.69 

45 

11.56 

44 

11.44 

43 

11.32 

42 

20 

0.10 

12.97 

48 

12.85 

47 

12.72 

46 

12.60 

45 

12.48 

44 

12.36 

43 

0.11 

21 

14.07 

50 

13.94 

49 

13.82 

48 

13.70 

47 

13.58 

46 

13.45 

45 

22 

0.12 

15.22 

51 

15.10 

50 

14.98 

49 

14.85 

48 

14.73 

47 

14.61 

46 

23 

0.12 

16.45 

52 

16.32 

51 

16.20 

50 

16.08 

49 

15.95 

48 

15.83 

47 

24 

0.13 

17.73 

52 

17.61 

52 

17.49 

51 

17.36 

50 

17.24 

49 

17.12 

48 

25 

0.14* 

19.09 

53 

18.97 

52 

18.85 

52 

18.72 

51 

18.60 

50 

18.47 

49 

0.14 

26 

20.52 

54 

20.39 

53 

20.27 

52 

20.14 

51 

20.02 

51 

19.90 

50 

27 

0.15 

22.03 

55 

21.90 

54 

21.78 

53 

21.65 

52 

21.53 

51 

21.41 

51 

28 

0.16 

23.61 

55 

23.49 

54 

23.36 

53 

23.24 

53 

23.11 

52 

22.99 

51 

29 

0.17 

25.29 

56 

25.16 

55 

25.04 

54 

24.91 

54 

24.79 

53 

24.66 

52 

30 

0.18 

27.05 

57 

26.92 

56 

26.80 

55 

26.67 

55 

26.55 

54 

26.42 

53 

0.19 

i 

31 

28.90 

58 

28.78 

57 

28.65 

56 

28.53 

55 

28.40 

55 

28.27 

54 

32 

0.20 

30.85 

59 

30.72 

58 

30.60 

57 

30.47 

56 

30.35 

56 

33 

34 

35 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.06  mm. 

24 


PSYCHROMETRICAL    TABLES. 


11 


t  —  t',  Difference  of  Wet  and  Dry-Bulb  Thermometers. 

Wet- 
Bulb 

Mean 

Thermo 

Vertical 

8°.J: 

8°.6 

8°.8 

9°.0             9°.2 

9°.4 

meter, 
t' 

Differ- 

Centi- 
grade 
Degrees 

ence  for 
each  0°.l 

Force  of 
Vapor. 

Relative 
Humid- 
ity. 

Force  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force o 
Vapor. 

Rela- 
tive 
Hu- 
mid 

Force  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force o 
Vapor. 

Rela-  j 
live 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim 

Millim. 

Millim 

0 

1 

2 

0.04 

0.30 

3 

0.18 

2 

0.06 

1 

3 

0.04 

0.67 

7 

0.55 

5 

0.43 

4 

0.31 

3 

0.19 

2 

0.08 

1 

4 

0.04 

1.07 

-  10 

0.95 

9 

0.83 

8 

0.72 

6 

0.60 

5 

0.48 

4 

5 

1.50 

13 

1.38 

12 

1.26 

11 

1.14 

10 

1.02 

8 

0.90 

7 

0.05 

6 

0.05 

1.96 

16 

1.84 

15 

1.72 

14 

1.60 

13 

1.48 

12 

1.36 

10 

7 

0.05 

2.44 

19 

2.32 

17 

2.20 

16 

2.08 

15 

1.96 

14 

1.S4 

13 

8 

0.06 

2.96 

21 

2.84 

20 

2.72 

19 

2.60 

18 

2.48 

17 

2.36 

16 

9 

0.06 

3.51 

24 

3.39 

23 

3.27 

21 

3.15 

20 

3.03 

19 

2.91 

18 

10 

4.09 

26 

3.97 

25 

3.85 

24 

3.73 

23 

3.61 

22 

3.49 

21 

0.06 

11 

0.07 

4.71 

28 

4.59 

27 

4.47 

26 

4.35 

25 

4.23 

24 

4.11 

23 

12 

0.07 

5.87 

30 

5.25 

29 

5.12 

28 

5.00 

27 

4.88 

26 

4.76 

25 

13 

0.07 

6.06 

32 

5.94 

31 

5.82 

30 

5.70 

29 

5.58 

28 

5.46 

27 

14 

O.OS 

6.80 

34 

6.68 

33 

6.56 

32 

6.44 

31 

6.31 

30 

6.19 

29 

15 

7.58 

35 

7.46 

34 

7.34 

33 

7.22 

33 

7.10 

32 

6.97 

31 

0.08 

16 

0.09 

8.41 

37 

8.29 

36 

8.17 

35 

8.05 

34 

7.92 

33 

7.80 

32 

17 

0.09 

9.29 

39 

9.17 

38 

9.04 

37 

8.92 

36 

8.80 

35 

8.68 

34 

18 

0.10 

10.22 

40 

10.09 

39 

9.97 

38 

9.85 

37 

9.73 

36 

9.60 

35 

19 

0.11 

11.20 

41 

11.07 

40 

10.95 

39 

10.83 

39 

10.71 

38 

10.58 

37 

20 

12.23 

43 

12.11 

42 

11.99 

41 

11.87 

40 

11.74 

39 

11.62 

38 

o.n 

21 

0.12 

13.33 

44 

13.21 

43 

13.08 

42 

12.96 

41 

12.84 

40 

12.71 

40 

22 

0.12 

14.48 

45 

14.36 

44 

14.24 

43 

14.12 

42 

13.99 

41 

13.87 

41 

23 

0.13 

15.71 

46 

15.58 

45 

15.46 

44 

15.34 

43 

15.21 

42 

15.09 

42 

24 

0.14 

16.99 

47 

16.87 

46 

16.75 

45 

16.62 

44 

16.50 

44 

16.37 

43 

25 

18.35 

48 

18.22 

47 

18.10 

46 

17.98 

45 

17.86 

45 

17.73 

44 

0.14 

26 

0.15 

19.77 

49 

19.65 

48 

19.52 

47 

19.40 

46 

19.27 

46 

19.15 

45 

27 

0.16 

21.28 

50 

21.16 

49 

21.03 

48 

20.91 

47 

20.78 

47 

20.66 

46 

28 

0.17 

22.86 

51 

22.74 

50 

22.61 

49 

22.49 

48 

22.36 

47 

22.24 

47 

29 

0.18 

24.54 

51 

24.41 

51 

24.29 

50 

24.16 

49 

24.04 

48 

23.91 

47 

30 

26.30 

52 

26.17 

51 

26.05 

51 

25.92 

50 

25.80 

49 

25.67 

48 

0.19 

31 

28.16 

53 

28.03 

52 

27.91 

51 

27.78 

51 

32 

33 

34 

35 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  OM  =  0  06  mm. 

B 


25 


PSYCHROMETRICAL    TABLES. 


t  —  t',  Difference  of  Wet  and  Dry-Bulb  Thermometers. 

Wet- 

Bulb 

Mean 

Thermo- 

Vertical 

9°.6 

9°.8 

1O°.O 

1O°.2 

10°.4 

10°.6 

meter, 
t' 

Differ- 

Centi- 
grade 
;  Degrees. 

ence  for 
eachO°.l. 

Force  of 
Vapor. 

Relative 
Humid- 
ity. 

Force  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

1 

2 

3 

4 

0.36 

3 

0.24 

2 

0.12 

1 

5 

0.04 

0.78 

6 

0.66 

5 

0.54 

4 

0.42 

3 

0.30 

2 

0.18 

1 

0.05 

6 

1.24 

9 

1.12 

8 

1.00 

7 

0.88 

6 

0.76 

5 

0.64 

5 

7 

0.05 

1.72 

12 

1.60 

11 

1.48 

10 

1.36 

9 

1.24 

8 

1.12 

7 

8 

0.05 

2.24 

15 

2.12 

14 

2.00 

13 

1.88 

12 

1.76 

11 

1.64 

10 

9 

0.06 

2.79 

17 

2.66 

16 

2.54 

16 

2.42 

15 

2.30 

14 

2.18 

13 

10 

0.06 

3.37 

20 

3.25 

19 

3.13 

18 

3.00 

17 

2.88 

16 

2.76 

15 

0.06 

11 

3.98 

22 

3.86 

21 

3.74 

20 

3.62 

19 

3.50 

18 

3.38 

18 

12 

0.07 

4.64 

24 

4.52 

23 

4.40 

22 

4.28 

22 

4.15 

21 

4.03 

20 

13 

0.07 

5.33 

26 

5.21 

25 

5.09 

25 

4.97 

24 

4.85 

23 

4-73 

22 

14 

0.07 

6.07 

28 

5.95 

27 

5.83 

26 

5.71 

25 

5.58 

25 

5.46 

24 

15 

0.08 

6.85 

30 

6.73 

29 

6.61 

28 

6.49 

27 

6.37 

26 

6-24 

26 

0.08 

16 

7-68 

31 

7.56 

31 

7.44 

30 

7.31 

29 

7.19 

28 

7.07 

27 

17 

0.09 

8.56 

33 

8.43 

32 

8.31 

31 

8.19 

31 

8.07 

30 

7.94 

29 

18 

0.09 

9.48 

35 

9.36 

34 

9.24 

33 

9.11 

32 

8.99 

31 

8.87 

30 

19 

0.10 

10.46 

36 

10.34 

35 

10.22 

34 

10.09 

33 

9.97 

33 

9.85 

32 

20 

0.11 

11.50 

37 

11.37 

36 

11.25 

36 

11.13 

35 

11.01 

34 

10.88 

33 

0.11 

21 

12.59 

39 

12.47 

38 

12.35 

37 

12.22 

36 

12.10 

35 

11.98 

35 

22 

0.12 

13.75 

40 

13.62 

39 

13.50 

38 

13.38 

37 

13.25 

37 

13.13 

36 

23 

0.12 

14.96 

41 

14.84 

40 

14.72 

39 

14.59 

39 

14.47 

38 

14.35 

37 

24 

0.13 

16.25 

42 

16.13 

41 

16.00 

40 

15.88 

40 

15.76 

39 

15.63 

38 

25 

0.14 

17.61 

43 

17.48 

42 

17.36 

42 

17.24 

41 

17112 

40 

16.99 

39 

0.14 

26 

19.02 

44 

18.90 

43 

18.78 

42 

18.65 

42 

18.53 

41 

18.40 

40 

27 

0.15 

20.54 

45 

20.41 

44 

20.29 

43 

20.16 

43 

20.04 

42 

19.91 

41 

28 

0.16 

22.12 

46 

22.00 

45 

21.87 

44 

21.75 

44 

21.62 

43 

21.50 

42 

29 

0.17 

23.79 

47 

23.66 

46 

23.54 

45 

23.41 

45 

23.29 

44 

23.16 

43 

30 

0.18 

25.55 

48 

25.42 

47 

25.30 

46 

31 

32 

33 

34 

35 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.06  mm. 

PSYCHROMETRICAL   TABLES. 


13 


t  —  t',  Difference  of  Wet  and  Dry  -Bulb  Thermometers. 

Wet- 

Bulb 

Mean 

Thermo- 

Vertical 

10°.8 

11°.O 

11°.2 

ll°.4 

11°.6 

ll°.§ 

meter. 

Differ- 

t' 
Centi- 

ence  for 

grade 
Degrees. 

eachOM. 

Force  of 
Vapor. 

Relative 
Humid- 
ity. 

Force  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

1 

2 

3 

4 

5 

6 

0.05 

0.52 

4 

0.40 

3 

0.28 

2 

0.16 

1 

.     7 

0.05 

1.00 

7 

0.88 

6 

0.76 

5 

0.64 

4 

0.52 

3 

0.40 

2 

8 

0.06 

1.52 

9 

1.40 

9 

1.27 

8 

1.15 

7 

1.03 

6 

0.91 

5 

9 

0.06 

2.06 

12 

1.94 

11 

1.82 

10 

1.70 

10 

1.58 

9 

1.46 

8 

10 

2.64 

14 

2.52 

14 

2.40 

13 

2.28 

12 

2.16 

11 

2.04 

11 

0.06 

11 

0.07 

3.26 

17 

3.14 

16 

3.02 

15 

2.90 

14 

2.77 

14 

2.65 

13 

12 

0.07 

3.91 

19 

3.79 

18 

3.67 

17 

3.55 

17 

3.43 

16 

3.31 

15 

13 

0.07 

4.61 

21 

4.49 

20 

4.36 

19 

4.24 

19 

4.12 

18 

4.00 

17 

14 

0.08 

5.34 

23 

5.22 

22 

5.10 

21 

4.98 

21 

4.86 

20 

4.73 

19 

15 

6.12 

25 

6.00 

24 

5.88 

23 

5.76 

22 

5.63 

22 

5.51 

21 

0.08 

16 

0.09 

6.95 

27 

6.83 

26 

6.70 

25 

6.58 

24 

6.46 

23 

6.34 

22 

17 

0.09 

7.82 

28 

7.70 

27 

7.58 

27 

7.46 

26 

7.33 

25 

7.21 

24 

18 

0.10 

8.75 

29 

8.63 

29 

8.50 

28 

8.38 

27 

8.26 

27 

8.14 

26 

19 

0.10 

9.73 

31 

9.60 

30 

9.48 

30 

9.36 

29 

9.24 

28 

9.11 

28 

20 

10.76 

33 

10.64 

32 

10.51 

31 

10.39 

30 

10.27 

30 

10.15 

29 

0.11 

21 

0.12 

11.85 

34 

11.73 

33 

11.61 

32 

11.48 

32' 

11.36 

31 

11.24 

30 

22 

0.12 

13.01 

35 

12.88 

34 

12.76 

34 

12.64 

33 

12.51 

32 

12.39 

32 

23 

0.13 

14.22 

36 

14.10 

36 

13.98 

35 

13.85 

34 

13.73 

34 

13.61 

33 

24 

0.14 

15.51 

38 

15.39 

37 

15.27 

36 

15.15 

35 

15.02 

35 

14.90 

34 

25 

16.87 

39 

16.74 

38 

16.62 

37 

16.49 

36 

16.37 

36 

16.24 

35 

0.14 

• 

26 

0.15 

18.28 

39 

18.16 

39 

18.03 

38 

17.91 

37 

17.78 

37 

17.66 

36 

27 

0.16 

19.79 

40 

19.67 

40 

19.54 

39 

19.42 

38 

19.29 

38 

19.17 

37 

28 

0.17 

21.37 

41 

21.25 

41 

21.12 

40 

21.00 

39 

20.87 

39 

20.75 

38 

29 

23.04 

42 

22.91 

42 

30 

31 

32 

33 

34 

35 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  O'.l  =  0.06  mm. 

B                                                           27 

14 


PSYCHROMETRICAL   TABLES. 


t  —  t',  Difference  of  Wet  and  Dry  -Bulb  Thermometers. 

Wet- 
Bulb 

Mean 

Thermo- 

Vertical 

12°.0 

12°.  2 

12°.4 

12°.6 

I23.8 

13°.0 

meter, 
t' 

Differ- 

Centi- 
grade 
Decrees. 

ence  for 
each  0°.l. 

Force  of 
Vapor. 

Relative 
Humid- 
ity. 

Force  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force  of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim 

12 

3.19 

14 

3.06 

14 

2.94 

13 

2.82 

12 

2.70 

12 

2.58 

11 

0.07 

13 

3.88 

16 

3.76 

16 

3.64 

15 

3.51 

14 

3.39 

14 

3.27 

13 

14 

0.07 

4.61 

18 

4.49 

18 

4.37 

17 

4.25 

16 

4.13 

16 

4.00 

15 

0.08 

15 

5.39 

20 

5.27 

20 

5.15 

19 

5.03 

18 

4.90 

18 

4.78 

17 

16 

0.08 

6.22 

22 

6.09 

21 

5.97 

21 

5.85 

20 

5.73 

19 

5.61 

19 

0.09 

17 

7.09 

24 

6.97 

23 

6.84 

22 

6.72 

22 

6.60 

21 

6.48 

21 

0.09 

18 

8.01 

25 

7.89 

25 

7.77 

24 

7.65 

23 

7.52 

23 

7.40 

22 

19 

0.10 
0.10 

8.99 

27 

8.87 

26 

8.74 

26 

8.62 

25 

8.50 

25 

8.38 

24 

20 

10.02 

28 

10.90 

28 

9.78 

27 

9.65 

26 

9.53 

26 

9.41 

25 

21 

o.n 

11.12 

30 

10.99 

29 

10.87 

28 

10.75 

28 

10.62 

27 

10.50 

27 

0.12 

22 

0.12 

12.27 

31 

12.14 

30 

12.02 

30 

11.90 

29 

11.77 

28 

11.65 

28 

23 

13.48 

32 

13.36 

31 

13.23 

31 

13.11 

30 

12.99 

29 

12.86 

29 

24 

0.13 

14.78 

33 

14.65 

33 

14.53 

32 

14.40 

31 

14.28 

31 

14.16 

30 

25 

0.14 

16.11 

35 

15.99 

34 

15.87 

33 

15.74 

33 

15.62 

32 

15.50 

31 

26 

0.14 

17.54 

36 

17.42 

35 

17.29 

34 

17.17 

34 

17.04 

33 

16.92 

33 

0.15 

27 

0.16 

19.04 

37 

18.92 

36 

18.80 

35 

18.67 

35 

18.55 

34 

18.42 

34 

28 

20.63 

38 

13.°2 

13°.4: 

IS3.  6 

13°.§ 

14°.O 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

12 

2.46 

10 

2.34 

10 

2.22 

9 

2.09 

8 

1.97 

8 

13 

0.07 

3.15 

12 

3.03 

12 

2.91 

11 

2.79 

11 

2.66 

10 

14 

0.07 

3.88 

14 

3.76 

14 

3.64 

13 

3.52 

13 

3.40 

12 

15 

0.08 

4.66 

16 

4.54 

16 

4.42 

15 

4.29 

15 

4.17 

14 

16 

0.08 

,  5.48 

18 

5.36 

18 

5.24 

17 

5.12 

16 

5.00 

16 

0.09 

•» 

*  17 

0.09 

6.36 

20 

6.23 

19 

6.11 

19 

5.99 

18 

5.87 

17 

18 

7.28 

22 

7.16 

21 

7.03 

20 

6.91 

20 

6.79 

19 

19 

0.10 
0.10 

8.25 

23 

8.13 

22 

8.01 

22 

7.89 

21 

7.76 

21 

20 

9.29 

25 

9.16 

24 

9.04 

23 

8.92 

23 

8.80 

22 

21 

0.11 

10.38 

26 

10.25 

25 

10.13 

25 

10.01 

24 

9.89 

24 

0.12 

22 

0.12 

11.53 

27 

11.40 

27 

11.28 

26 

11.16 

26 

11.03 

25 

23 

12.74 

28 

12.62 

28 

12.49 

27 

12.37 

27 

12.25 

26 

24 

0.13 

14.02 

30 

13.90 

29 

13.77 

29 

13.65 

28 

13.53 

27 

25 

0.14 

15.37 

31 

15.25 

30 

15.12 

30 

15.00 

29 

14.88 

29 

26 

0.14 

16.80 

32 

16.67 

31 

16.55 

31 

16.42 

30 

16.30 

30 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.06  mm. 

B 


PSYCHROMETRICAL    TABLES. 
Correction  for  the  Barometrical  Height. 


15 


For1  the 

Difference  of  Thermometers  t  —  t'. 

Barometrical 

Height  below. 

1° 

2° 

3° 

4° 

5° 

6° 

r> 

8° 

9° 

1O° 

11° 

12° 

13° 

14° 

Add. 

Subtr'ct. 

Wet-Bulb  above  the  Freezing  Point. 

Millim. 

Millim. 

Milli. 

Milli. 

Milli. 

Milli. 

Milli. 

Milli. 

Milli. 

Milli. 

Milli. 

Milli. 

Milli. 

Milli. 

Milli. 

Milli. 

755 

755 

Q.OO 

0.00 

0.00 

0.00 

0.00 

0.00 

0.00 

0.00 

0.00 

0.00 

0.00 

0.00 

0.00 

0.00 

750 

760 

0.00 

0.01 

0.01 

0.02 

0.02 

0.02 

0.03 

0.03 

0.04 

0.04 

0.04 

0.05 

0.05 

0.06 

745 

765 

0.01 

0.02 

0.02 

0.03 

0.04 

0.05 

0.06 

0.06 

0.07 

0.08 

0.09 

0.10 

0.10 

0.11 

740 

770 

0.01 

0.02 

0.04 

0.05 

0.06 

0.07 

0.08 

0.10 

0.11 

0.12 

0.13 

0.14 

0.16 

0.17 

735 

775 

0.02 

0.03 

0.05 

0.06 

0.08 

0.10 

0.11 

0.13 

0.14 

0.16 

0.18 

0.19 

0.21 

0.22 

730 

780 

0.02 

0.04 

0.06 

0.08 

0.10 

0.12 

0.14 

0.16 

0.18 

0.20 

0.22 

0.24 

0.26 

0.28 

725 

785 

0.02 

0.05 

0.07 

0.10 

0.12 

0.14 

0.17 

0.19 

0.22 

0.24 

0.26 

0.29 

0.31 

0.34 

720 

790 

0.03 

0.06 

0.08 

0.11 

0.14 

0.17 

0.20 

0.22 

0.25 

0.28 

0.31 

0.34 

0.36 

0.39 

715 

795 

0.03 

0.06 

0.10 

0.13 

0.16 

0.19 

0.22 

0.26 

0.29 

0.32 

0.35 

0.38 

0.42 

0.45 

710 

800 

0.04 

0.07 

0.11 

0.14 

0.18 

0.22 

0.25 

0.29 

0.32 

0.36 

0.40 

0.43 

0.47 

0.50 

700 

1C 

0.04 

0.09 

0.13 

0.18 

0.22 

0.26 

0.31 

0.35 

0.40 

0.44 

0.48 

0.53 

0.57 

0.62 

690 

u 

0.05 

0.10 

0.16 

0.21 

0.26 

0.31 

0.36 

0.42 

0.47 

0.52 

0.57 

0.62 

0.68 

0.73 

680 

1C 

0.06 

0.12 

0.18 

0.24 

0.30 

0.36 

0.42 

0.48 

0.54 

0.60 

0.66 

0.72 

0.78 

0.84 

670 

u 

0.07 

0.14 

0.20 

0.27 

0.34 

0.41 

0.48 

0.54 

0.61 

0.68 

0.75 

0.82 

0.88 

0.95 

660 

(t 

0.08 

0.15 

0.23 

0.30 

0.38 

0.46 

0.53 

0.61 

0.68 

0.76 

0.84 

0.91 

0.99 

1.06 

650 

u 

0.08 

0.17 

0.25 

0.34 

0.42 

0.50 

0.59 

0.67 

0.76 

0.84 

0.92 

1.01 

1.09 

1.18 

Wet-bulb  below  the 
Freezing  Point. 

EXAMPLE  OF  CALCULATION. 

755 

755 

0.00 

0.00 

0.00 

0.00 

0.00 

750 

760 

0.00 

0.01 

0.01 

0.01 

0.02 

Wet-bulb  above  the  Freezing  Point. 

745 

765 

0.01 

0.01 

0.02 

0.03 

0.04 

t'  =  17°.0.        t  —  t'  =  8°.2.        h  =  7lOmra- 

740 

770 

0.01 

0.02 

0.03 

0.04 

0.05 

The  tables  give  for  mean  barometrical     mra. 

735 

775 

0.01 

0.03 

0.04 

0.06 

0.07 

height  755mm-    Force  of  vapor       .        .     =  9.41 

Additive  correction  for  710mm-  and  8°.2    =  0.30 

730 
725 

780 

785 

0.02 
0.02 

0.04 
0.04 

0.05 
0.06 

0.07 
0.08 

0.09 
0.11 

Force  of  vapor          .        .     =9.71 

720 

790 

0.02 

0.05 

0.07 

0.10 

0.12 

|    715 

795 

0.03 

0.06 

0.08 

0.11 

0.14 

The  mean  barometrical  pressure,  at  a  given 

710 

800 

0.03 

0.06 

0.09 

0.13 

0.16 

place,  being  known,  it  is  easy  to  make  the  above 

Psychrometrical  Tables  fitted  for  that  place,  by 

700 

tc 

0.04 

O.OS 

0.12 

0.15 

0.19 

determining,  by  means  of  this  last  table,  a  constant 

690 

u 

0.05 

0.09 

0.14 

0.18 

0.23 

correction,  to  be  applied  to  the  numbers  in  the  ta- 

680 

"       :0.05 

0.11 

0.16 

0.21 

0.26 

bles,  giving  the  force  of  vapor.     This  correction 

670 

u 

0.06 

0.12 

0.18 

0.24 

0.30 

will  be  found  by  taking  for  t  —  t',  or  the  difference 

660 

a 

0.07 

0.13 

0.20 

0.27 

0.33 

of  thermometers,  a  mean  value,  the  deviations  of 

650 

u 

0.07 

0.15 

0.22 

0.29 

0.36 

which  will  have  little  influence  upon  the  accuracy 
of  the  results. 

i 

B 


29 


III. 


TABLE 

GIVING-    AT     SIGHT    THE     RELATIVE     HUMIDITY     DEDUCED    FROM    THE    INDICA- 
TIONS   OF    THE    DEW   POINT    INSTRUMENTS. 

BY  M.  T.  HAEGHENS. 


THIS  table,  which  has  been  published  in  the  Annuaire  Meteor  ologique  de  Francs 
for  1850,  page  86,  and  following,  has  been  calculated  by  Mr.  Haeghens,  using 
Regnault's  Tables  of  Elastic  Forces  of  Vapor.  It  gives  directly  the  relative  humidity, 
when  the  hygrometrical  observations  have  been  made  by  means  of  dew  point  instru- 
ments like  those  of  Daniell,  Regnault,  Bache,  and  others. 

These  hygrometers  are  destined  to  find  out  the  temperature  of  the  dew  point,  that 
is  the  temperature  to  which  it  would  be  necessary  to  lower  the  temperature  of  the 
air,  in  order  that  this  air  be  completely  saturated  by  the  aqueous  vapor  which  it  con- 
tained at  the  time  of  the  observation. 

The  force  of  vapor  contained  in  the  air,  or  its  absolute  humidity,  is  thus  the  maxi- 
mum of  force  of  vapor  which  corresponds  to  the  temperature  of  the  dew  point ;  it  is 
given  directly  in  the  Table  I.  of  the  Elastic  Forces  of  Vapor,  by  Regnault. 

The  ratio  of  that  maximum  of  force  of  vapor  at  the  temperature  of  the  dew  point 
to  the  force  of  vapor  which  corresponds,  in  the  same  table,  to  the  temperature  of  the 
surrounding  air  at  the  time  of  the  observation,  is  the  relative  humidity.  This  ratio  is 
given  in  hundredths  in  the  following  table,  which  relieves  the  observer  of  the  trouble 
of  calculating  it. 

Let  t  —  temperature  of  the  air  surrounding  the  instrument. 
t'  =  temperature  of  the  dew  point. 
t  —  t1  =  the  difference  between  these  two  temperatures. 

The  first  column,  on  the  left,  contains  the  temperature  of  the  air  t,  in  centigrade 
degrees.  The  following  ones,  headed  with  the  differences,  t  —  t1,  between  the 
temperatures  of  the  air  and  of  the  dew  point,  give  the  relative  humidity  correspond- 
ing to  the  two  elements. 

Temp,  of  the  Air  =  t.  Dew  point  =  t1.  Difference  t  —  t1.  Relative  Humidity. 

Example:         10°.0  4°.4  5°.6  68 

Should  the  temperature  of  the  air  t',  or  the  difference  t  —  £',  fall  between  the 
numbers  found  in  the  columns,  it  is  obvious,  by  glancing  at  the  table,  that  an  inter- 
polation at  sight  will  always  be  easy. 

B  30 


III.    RELATIVE    HUMIDITY    IN    HTJNDREDTHS. 


Temper- 
ature of 
the  air. 

t  —  t'  =  Difference  of  Temperatures  of  the  Dew  Point  and  of  the  Air. 

0°,0 

00  .) 
MB 

0°,4 

0°,6  0°,8 

1".0 

1^0) 

T,4 

1°  fi 

1°  8 

2°  0 

go  9 

go  i 

0°  fi 

r  8 

Centig. 

-S 

100 

98 

97 

95 

94 

92 

90 

89 

88 

86 

85 

83 

82 

80 

79 

-7 

100 

98 

97 

95 

94 

92 

91 

89 

88 

86 

85 

83 

82 

81 

79 

-6 

100 

98 

97 

95 

94 

92 

91 

89 

88 

87 

85 

84 

82 

81 

80 

-5 

100 

98 

97 

95 

94 

92 

91 

89 

88 

87 

85 

84 

82 

81 

80 

-4 

100 

98 

97 

95 

94 

92 

91 

89 

88 

87 

85 

84 

83 

81 

80 

-3 

100 

98 

97 

95 

94 

92 

91 

90 

88 

87 

85 

84 

83 

81 

80 

_2 

100 

98 

97 

95 

94 

93 

91 

90 

88 

87 

86 

84 

83 

82 

80 

-1 

100 

98 

97 

95 

94 

93 

91 

90 

89 

87 

86 

85 

83 

82 

81 

0 

100 

98 

97 

96 

94 

93 

91 

90 

89 

87 

86 

85 

83 

82 

81 

+1 

100 

99 

97 

96 

95 

93 

92 

90 

89 

88 

86 

85 

84 

83 

81 

2 

100 

99 

97 

96 

95 

93 

92 

91 

89 

88 

87 

85 

84 

83 

82 

3 

100 

99 

97 

96 

95 

93 

92 

91 

89 

88 

87 

86 

84 

83 

82 

4 

100 

99 

97 

96 

95 

93 

92 

91 

89 

88 

87 

86 

85 

83 

82 

5 

100 

99 

97 

96 

95 

93 

92 

91 

90 

88 

87 

86 

85 

83 

82 

6 

100 

99 

97 

96 

95 

93 

92 

91 

90 

88 

87 

86 

85 

84 

82 

7 

100 

99 

97 

96 

95 

93 

92 

91 

90 

89 

87 

86 

85 

84 

83 

8 

100 

99 

97 

96 

95 

93 

92 

91 

90 

89 

87 

86 

85 

84 

83 

9 

100 

99 

97 

96 

95 

94 

92 

91 

90 

89 

87 

86 

85 

84 

83 

10 

100 

99 

97 

96 

95 

94 

92 

91 

90 

89 

87 

86 

85 

84 

83 

11 

100 

99 

97 

96 

95 

94 

92 

91 

90 

89 

87 

86 

85 

84 

83 

12 

100 

99 

97 

96 

95 

94 

92 

91 

90 

89 

88 

87 

85 

84 

83 

13 

100 

99  ' 

97 

96 

95 

94 

92 

91 

90 

89 

88 

87 

85 

84 

83 

14 

100 

99 

98 

96 

95 

94 

93 

91 

90 

89 

88 

87 

86 

84 

83 

15 

100 

99 

98 

96 

95 

94 

93 

91 

90 

89 

88 

87 

86 

84 

83 

16 

100 

99 

98 

96 

95 

94 

93 

91 

90 

89 

88 

87 

86 

85 

84 

17 

100 

99 

98 

96 

95 

94 

93 

91 

90 

89 

88 

87 

86 

85 

84 

18 

100 

99 

98 

96 

95 

94 

93 

92 

90 

89 

88 

87 

86 

85 

84 

19 

100 

99 

98 

96 

95 

94 

93 

92 

91 

89 

88 

87 

86 

85 

84 

20 

100 

99 

98 

96 

95 

94 

93 

92 

91 

89 

88 

87 

86 

85 

84 

21 

100 

99 

98 

96 

95 

94 

93 

92 

91 

90 

88 

87 

86 

85 

84 

22 

100 

99 

98 

96 

95 

94 

93 

92 

91 

90 

89 

87 

86 

85 

84 

23 

100 

99 

98 

96 

95 

94 

93 

92 

91 

90 

89 

88 

86 

85 

84 

24 

100 

99 

98 

97 

95 

94 

93 

92 

91 

90 

89 

88 

87 

85 

84 

25 

100 

99 

98 

97 

95 

94 

93 

92 

91 

90 

89 

88 

87 

86 

85 

26 

100 

99 

98 

97 

95 

94 

93 

92 

91 

90 

89 

88 

87 

86 

85 

27 

100 

99 

98 

97 

95 

94 

93 

92 

91 

90 

89 

88 

87 

86 

85 

28 

100 

99 

98 

97 

95 

94 

93 

92 

91 

90 

89 

88 

87 

86 

85 

29 

100 

99 

98 

97 

96 

94 

93 

92 

91 

90 

89 

88 

87 

86 

85 

30 

100 

99 

98 

97 

96 

94 

93 

92 

91 

90 

89 

88 

87 

86 

85 

31 

100 

99 

98 

97 

96 

94 

93 

92 

91 

90 

89 

88 

87 

86 

85 

32 

100 

99 

98 

97 

96 

94 

93 

92 

91 

90 

89 

88 

87 

86 

85 

33 

100 

99 

98 

97 

96 

94 

93 

92 

91 

90 

89 

88 

87 

86 

85 

34 

100 

99 

98 

97 

96 

95 

93 

92 

91 

90 

89 

88 

87 

86 

85 

35 

100 

99 

98 

97 

96 

95 

93 

92 

91 

90 

89 

88 

87 

86 

85 

B 


31 


RELATIVE    HUMIDITY    IN    HUNDREDTHS. 


Temper- 
ature of 
the  air. 

t  —  t'  =  Difference  of  Temperatures  of  the  Dew  Point  and  of  the  Air. 

r,o 

0 

i.'i 

S°.6 

go  0 

6  .0 

4°,0 

4°,2 

4°,4 

4°,6 

40  o 
•0 

s°,o 

fiM 

P'A 

5°,6 

f» 

Centig. 

-8 

78 

77 

75 

74 

73 

72 

71 

69 

68 

67 

66 

65 

64 

63 

62 

-7 

78 

77 

75 

74 

73 

72 

71 

69 

68 

67 

66 

65 

64 

63 

62 

-6 

78 

77 

76 

74 

73 

72 

71 

69 

68 

67 

66 

65 

64 

63 

62 

-5 

79 

77 

76 

75 

73 

72 

71 

70 

68 

67 

66 

65 

64 

63 

62 

-4 

79 

77 

76 

75 

74 

73 

71 

70 

69 

68 

67 

66 

64 

63 

62 

-3 

79 

77 

76 

75 

74 

73 

72 

70 

69 

68 

67 

66 

65 

64 

63 

-2 

79 

78 

77 

76 

74 

73 

72 

71 

70 

69 

68 

66 

65 

64 

63 

-1 

79 

78 

77 

76 

75 

73 

72 

71 

70 

69 

68 

67 

66 

65 

64 

0 

80 

78 

77 

76 

75 

74 

73 

71 

70 

69 

68 

67 

66 

65 

64 

+1 

80 

79 

78 

77 

75 

74 

73 

72 

71 

70 

69 

68 

66 

65 

64 

2 

81 

79 

78 

77 

76 

75 

74 

72 

71 

70 

69 

68 

67 

66 

65 

3 

81 

80 

78 

77 

76 

75 

74 

73 

72 

71 

70 

69 

68 

66 

65 

4 

81 

80 

79 

78 

77 

75 

74 

73 

72 

71 

70 

69 

68 

67 

66 

5 

81 

80 

79 

78 

77 

76 

75 

73 

72 

71 

70 

69 

68 

67 

66 

6 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

'  70 

69 

68 

67 

7 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

69 

68 

67 

8 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

69 

68 

67 

8 

82 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

69 

68 

67 

10 

82 

81 

80 

78 

77 

76 

75 

74 

73 

72 

71 

70 

69 

68 

67 

11 

82 

81 

80 

79 

78 

76 

75 

74 

73 

72 

71 

70 

70 

69 

68 

12 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

69 

68 

13 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71  * 

70 

69 

68 

14 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

69 

68 

15 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

69 

68 

16 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

71 

70 

69 

17 

83 

81 

80 

79 

78 

77 

76 

75 

74 

73 

73 

72 

71 

70 

69 

18 

83 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

69 

19 

83 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

69 

20 

83 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

69 

21 

83 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

70 

22 

83 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

73 

72 

71 

70 

23 

83 

82 

81 

80 

79 

78 

77 

76 

75 

74 

74 

73 

72 

71 

70 

24 

83 

82 

81 

80 

79 

78 

77 

77 

76 

75 

74 

73 

72 

71 

70 

25 

84 

83 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

26 

84 

83 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

27 

84 

83 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

28 

84 

83 

82 

81 

80 

79 

78 

77 

76 

75 

74 

73 

72 

71 

70 

29 

84 

83 

82 

81 

80 

79 

78. 

77 

76 

75 

75 

74 

73 

72 

71 

30 

84 

83 

82 

81 

80 

79 

78 

77 

76 

76 

75 

74 

73 

72 

71 

31 

84 

83 

82 

81 

80 

79 

78 

77 

77 

76 

75 

74 

73 

72 

71 

32 

84 

83 

82 

81 

80 

79 

79 

78 

77 

76 

75 

74 

73 

72 

72 

33 

84 

83 

82 

81 

80 

80 

79 

78 

77 

76 

75 

74 

73 

72 

72 

34 

85 

84 

83 

82 

81 

80 

79 

78 

77 

76 

75 

74 

74 

73 

72 

35 

85 

84 

83 

82 

81 

80 

79 

78 

77 

76 

75 

75 

74 

73 

72 

B 


RELATIVE    HUMIDITY    IN    HUNDREDTHS. 


Temper- 
ature ol 
the  air. 
t  = 

t  —  t'  =  Difference  of  Temperatures  of  the  Dew  Point  and  of  the  Air. 

6°0 

6°,2 

6°,4 

6°,6  6°,8 

7°,0 

7°,§ 

7°,4 

7°,6 

7°,8 

s°,o 

8°,2 

8°,4 

8°,6 

8°,8 

Centig. 

-8 

-7 

-6 

61 

60 

59 

58 

57 

56 

—5 

61 

60 

59 

58 

58 

57 

56 

55 

54 

53 

52 

-4 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

52 

-3 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

53 

52 

51 

50 

49 

-2 

62 

61 

60 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

-1 

63 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

52 

51 

50 

49 

-0 

63 

62 

61 

60 

59 

58 

57 

56 

55 

54 

53 

53 

52 

51 

50 

+1 

63 

62 

61 

61 

60 

58 

58 

57 

56 

55 

54 

53 

52 

51 

51 

2 

64 

63 

62 

61 

60 

59 

58 

57 

56 

55 

55 

54 

53 

52 

51 

3 

64 

63 

62 

62 

60 

60 

59 

58 

57 

56 

55 

54 

53 

53 

52 

4 

65 

64 

63 

62 

61 

60 

59 

58 

57 

56 

56 

55 

54 

53 

52 

5 

65 

64 

63 

62 

62 

61 

60 

59 

58 

57 

56 

55 

54 

54 

53 

6 

66 

65 

64 

63 

62 

61 

60 

59 

58 

57 

57 

56 

55 

54 

53 

7 

66 

65 

64 

63 

62 

61 

60 

60 

59 

58 

57 

56 

55 

55 

54 

8 

66 

65 

64 

63 

62 

62 

61 

60 

59 

58 

57 

56 

56 

55 

54 

9 

66 

65 

64 

64 

63 

62 

61 

60 

59 

58 

58 

57 

56 

55 

54 

10 

67 

66 

65 

64 

63 

62 

61 

60 

59 

59 

58 

57 

56 

55 

55 

11 

67 

66 

65 

64 

63 

62 

61 

61 

60 

59 

58 

57 

56 

56 

55 

12 

67 

66 

65 

64 

63 

62 

62 

61 

60 

59 

58 

57 

57 

56 

55 

13 

67 

66- 

65 

64 

64 

63 

62 

61 

60 

59 

59 

58 

57 

56 

55 

14 

67 

66 

66 

65 

64 

63 

62 

61 

60 

60 

59 

58 

57 

56 

56 

15 

67 

67 

66 

65 

64 

63 

62 

61 

61 

60 

59 

58 

57 

57 

56 

16 

68 

67 

66 

65 

64 

63 

'63 

62 

61 

60 

59 

58 

58 

57 

56 

17 

68 

67 

66 

65 

64 

64 

63 

62 

61 

60 

59 

59 

58 

57 

56 

IS 

68 

67 

66 

65 

65 

64 

63 

62 

61 

60 

60 

59 

58 

57 

57 

19 

68 

67 

67 

66 

65 

64 

63 

62 

62 

61 

60 

59 

58 

58 

57 

20 

68 

68 

67 

66 

65 

64 

63 

63 

62 

61 

60 

59 

59 

58 

57 

21 

69 

68 

67 

66 

65 

64 

64 

63 

62 

61 

60 

60 

59 

58 

57 

22 

69 

68 

67 

66 

65 

65 

64 

63 

62 

61 

61 

60 

59 

58 

58 

23 

69 

68 

67 

67 

66 

65 

64 

63 

62 

62 

61 

60 

59 

59 

58 

24 

69 

68 

68 

67 

66 

65 

64 

63 

63 

62 

61 

60 

60 

59 

58 

25 

69 

69 

68 

67 

66 

65 

64 

64 

63 

62 

61 

61 

60 

59 

58 

26 

70 

69 

68 

67 

66 

65 

65 

64 

63 

62 

61 

61 

60 

59 

58 

27 

70 

69 

68 

67 

66 

66 

65 

64 

63 

62 

62 

61 

60 

59 

59 

28 

70 

69 

68 

67 

67 

66 

65 

64 

63 

63 

62 

61 

60 

60 

59 

29 

70 

69 

69 

68 

67 

66 

65 

64 

64 

63 

62 

61 

61 

60 

59 

30 

70 

69 

69 

68 

67 

66 

65 

65 

64 

63 

62 

62 

61 

60 

59 

31 

70 

70 

69 

68 

67 

66 

66 

65 

64 

63 

62 

62 

61 

60 

60 

32 

71 

70 

69 

68 

67 

67 

66 

65 

64 

64 

63 

62 

61 

61 

60 

33 

71 

70 

69 

68 

68 

67 

66 

65 

64 

64 

63 

62 

61 

61 

60 

34 

71 

70 

69 

69 

68 

67 

66 

66 

65 

64 

63 

62 

62 

61 

60 

85 

71 

70 

70 

69 

68 

67 

66 

66 

65 

64 

63 

63 

62 

61 

60 

33 


RELATIVE    HUMIDITY    IN    HUNDREDTHS. 


Temper- 
ature of 
the  ait. 
t  = 

t  —  t'  =  Difference  of  Temperatures  of  the  Dew  Point  and  of  the  Air. 

9°,0 

9°,8 

9°,4 

9°,6 

9°,8 

10°,0 

10°,2 

10°  ,4 

10°,6 

10°,8 

11°,0 

H°.2 

11°  ,4 

11°,6 

ir.s 

Centig. 
-8 

- 

-7 

-6 

-5 

-4 
-3 

• 

-2 

-1 

0 

4-1 

50 

2 

50 

49 

49 

48 

47 

46 

3 

51 

50 

49 

48 

48 

47 

46 

45 

45 

44 

43 

4 

51 

51 

50 

49 

48 

47 

47 

46 

45 

44 

44 

43 

42 

42 

41 

5 

52 

51 

50 

49 

49 

48 

47 

46 

46 

45 

44 

43 

43 

42 

41 

6 

52 

52 

51 

50 

49 

48 

48 

47 

46 

45 

45 

44 

43 

43 

42 

7 

53 

52 

51 

51 

50 

49 

48 

47 

47 

46 

45 

45 

44 

43 

42 

8 

53 

52 

52 

51 

50 

49 

49 

48 

47 

46 

46 

45 

44 

44 

43 

9 

54 

53 

52 

51 

50 

50 

49 

48 

48 

47 

46 

45 

45 

44 

43 

10 

54 

53 

52 

51 

51 

50 

49 

49 

48 

47 

47 

46 

45 

44 

44 

11 

54 

53 

53 

52 

51 

50 

50 

49 

48 

48 

47 

46 

46 

45 

44 

12 

54 

54 

53 

52 

51 

51 

50 

49 

49 

48 

47 

47 

46 

45 

45 

13 

55 

54 

53 

52 

52 

51 

50 

50 

49 

48 

47 

47 

46 

46 

45 

14 

55 

54 

53 

53 

52 

51 

50 

50 

49 

48 

48 

47 

46 

46 

45 

15 

55 

54 

54 

53 

52 

51 

51 

50 

49 

49 

48 

47 

47 

46 

45 

16 

55 

55 

54 

53 

52 

52 

51 

50 

50 

49 

48 

48 

47 

46 

46 

17 

56 

55 

54 

53 

53 

52 

51 

51 

50 

49 

49 

48 

47 

47 

46 

18 

56 

55 

54 

54 

53 

52 

51 

51 

50 

49 

49 

48 

47 

47 

46 

19 

56 

55 

55 

54 

53 

52 

52 

51 

50 

50 

49 

48 

48 

47 

47 

20 

56 

56 

55 

54 

53 

53 

52 

51 

51 

50 

49 

49 

48 

47 

47 

21 

57 

56 

55 

54 

54 

53 

52 

52 

51 

50 

50 

49 

48 

48 

47 

22 

57 

56 

55 

55 

54 

53 

53 

52 

51 

50 

50 

49 

49 

48 

47 

23 

57 

56 

56 

55 

54 

53 

53 

52 

51 

51 

50 

49 

49 

48 

48 

24 

57 

57 

56 

55 

54 

54 

53 

52 

52 

51 

50 

50 

49 

48 

48 

25 

58 

57 

56 

55 

55 

54 

53 

53 

52 

51 

51 

50 

49 

49 

48 

26 

58 

57 

56 

56 

55 

54 

53 

53 

52 

51 

51 

50 

50 

49 

48 

27 

58 

57 

56 

56 

55 

54 

54 

53 

52 

52 

51 

50 

50 

49 

48 

28 

58 

57 

57 

56 

55 

55 

54 

53 

53 

52 

51 

51 

50 

49 

49 

29 

58 

58 

57 

56 

56 

55 

54 

53 

53 

52 

52 

51 

50 

50 

49 

30 

59 

58 

57 

57 

56 

55 

54 

54 

53 

52 

52 

51 

51 

50 

49 

31 

59 

58 

57 

57 

56 

55 

55 

54 

53 

53 

52 

51 

51 

50 

49 

32 

59 

58 

58 

57 

56 

56 

55 

54 

54 

53 

52 

52 

51 

50 

50 

33 

59 

59 

58 

57 

56 

56 

55 

54 

54 

53 

52 

52 

51 

51 

50 

34 

60 

59 

58 

57 

57 

56 

55 

55 

54 

53 

53 

52 

52 

51 

50 

35 

60 

59 

58 

58 

57 

56 

56 

55 

54 

54 

53 

52 

52 

51 

50 

B 


34 


RELATIVE    HUMIDITY   IN   HFNDREDTHS. 


Temper- 
ature oi 
the  air. 

t  —  t'  =  Difference  of  Temperatures  of  the  Dew  Point  and  of  the  Air. 

ir.o 

ir.2 

12°,4 

ir,6 

18°,8 

1!°,0 

1S°,8 

1!°,4 

15°,6 

H°,8 

14°,0 

14°,i 

14°,4 

14°,6 

14°,8 

Centig. 

-8 

-7 

-6 

-5 

-4 
-3 

-2 

-1 

0 

+1 

2 

3 

4 

40 

40 

39 

38 

38 

37 

5 

41 

40 

39 

39 

38 

38 

37 

36 

36 

35 

35 

6 

41 

41 

40 

39 

39 

38 

37 

37 

36 

36 

35 

35 

34 

33 

33 

7 

42 

41 

40 

40 

39 

39 

38 

37 

37 

36 

36 

35 

34 

34 

33 

8 

42 

42 

41 

40 

40 

39 

38 

38 

37 

37 

36 

35 

35 

34 

34 

9 

43 

42 

41 

41 

40 

40 

39 

38 

38 

37 

37 

36 

35 

35 

34 

10 

43 

43 

42 

41 

41 

40 

39 

39 

38 

38 

37 

36 

36 

35 

35 

11 

44 

43 

42 

42 

41 

40 

40 

39 

39 

38 

37 

37 

36 

36 

35 

12 

44 

43 

43 

42 

41 

41 

40 

40 

39 

38 

38 

37 

37 

36 

36 

13 

44 

44 

43 

42 

42 

41 

41 

40 

39 

39 

38 

38 

37 

37 

36 

14 

45 

44 

43 

43 

42 

42 

41 

40 

40 

39 

39 

38 

37 

37 

36 

15 

45 

44 

44 

43 

42 

42 

41 

41 

40 

39 

39 

38 

38 

37 

37 

16 

45 

44 

44 

43 

43 

42 

41 

41 

40 

40 

39 

39 

38 

38 

37 

17 

45 

45 

44 

43 

43 

42 

42 

41 

41 

40 

39 

39 

38 

38 

37 

18 

46 

45 

44 

44 

43 

43 

42 

41 

41 

40 

40 

39 

39 

38 

38 

19 

46 

45 

45 

44 

43 

43 

42 

42 

41 

41 

40 

39 

39 

38 

38 

20 

46 

45 

45 

44 

44 

43 

42 

42 

41 

41 

40 

40 

39 

39 

38 

21 

46 

46 

45 

45 

44 

43 

43 

42 

42 

41 

41 

40 

39 

39 

38 

22 

47 

46 

45 

45 

44 

44 

43 

43 

42 

4i 

41 

40 

40 

39 

39 

23 

47 

46 

46 

45 

45 

44 

43 

43 

42 

42 

41 

41 

40 

39 

39 

24 

47 

47 

46 

45 

45 

44 

44 

43 

42 

42 

41 

41 

40 

40 

39 

25 

47 

47 

46 

46 

45 

44 

44 

43 

43 

42 

42 

41 

41 

40 

39 

26 

48 

47 

46 

46 

45 

45 

44 

44 

43 

42 

42 

41 

41 

40 

40 

27 

48 

47 

47 

46 

45 

45 

44 

44 

43 

43 

42 

42 

41 

40 

40 

28 

48 

48 

47 

46 

46 

45 

45 

44 

44 

43 

42 

42 

41 

41 

40 

29 

48 

48 

47 

47 

46 

45 

45 

44 

44 

43 

43 

42 

42 

41 

41 

30 

49 

48 

47 

47 

46 

46 

45 

45 

44 

43 

43 

42 

42 

41 

41 

31 

49 

48 

48 

47 

46 

46 

45 

45 

44 

44 

43 

43 

42 

42 

41 

32 

49 

49 

48 

47 

47 

46 

46 

45 

45 

44 

43 

43 

42 

42 

41 

33 

49 

49 

48 

48 

47 

46 

46 

45 

45 

44 

44 

43 

43 

42 

42 

34 

50 

49 

49 

48 

47 

47 

46 

46 

45 

44 

44 

43 

43 

42 

42 

35 

50 

49 

49 

48 

48 

47 

46 

46 

45 

44 

44 

44 

43 

43 

42 

B 


35 


TABLE    IV. 

100 
FACTOR    -jji ,    FOR    COMPUTING    THE    RELATIVE    HUMIDITY,  OR    THE    DEGREE  OF  MOISTURE 

OF    THE    AIR    FROM    ITS    ABSOLUTE    HUMIDITY,    GIVEN    IN    MILLIMETRES. 

Br  HAEGIIENS. 

THE  Relative  Humidity,  or  the  degree  of  moisture  of  the  air,  is  the  ratio  of  the 
quantity  of  vapor  contained  in  the  air  to   the  quantity  it  could  contain  at  the  tem- 
perature observed,  if  fully  saturated. 
If  we  call 

The  force  of  vapor  contained  in  the  air  =  f^ 

The  maximum  of  the  force  of  vapor  at  the  temperature  of  the  air  =  F, 
The  point  of  saturation  =  100, 
we  have  the  proportion, 

Relative  Humidity  :  100  : :/:  F, 
and 

^XE—  =  Relative  Humidity  in  Hundredths. 

But  as  -^j—  =/X  -jr,  it  is  obvious  that  the  operation  indicated  by  the  former 
expression,  viz.  ^-XF100,  would  be  reduced  to  a  simple  multiplication,  if  we  had  a 
table  of  the  factors  ^j°.  Such  a  table  is  obtained  by  dividing  the  constant  number 
100  by  each  number  in  the  Table  of  Elastic  Forces  of  Vapor,  and  substituting  the 
quotients  to  the  tensions. 

The  following  Table,  taken  from  the  Annuaire  Meteorologique  de  la  France,  for 
1850,  p.  79,  gives  the  factor  ™  for  every  tenth  of  a  degree  from  — 10  to  +  35° 
Centigrade,  corresponding  to  the  Forces  of  Vapor  in  Table  I. 

USE  OF  THE  TABLE. 

The  force  of  vapor  contained  in  the  air  being  given  in  millimetres,  multiply  the 
number  expressing  it  by  the  factor  in  the  table  corresponding  to  the  temperature  of 
the  air  at  the  time  of  the  observation  ;  the  result  will  be  the  Relative  Humidity  in 
Hundredth^ 

Examples. 

1.     Suppose  the  temperature  of  the  air  to  be  =  24°  Centigrade. 

"         "    force  of  vapor  in  the  air  to  be  =  10.76  millimetres. 

Opposite  24°  is  found  in  the  table  the  factor  4.51. 

Then  10.76  X  4.51  =  48.5,  Relative  Humidity  in  Hundredths. 


2.     Suppose  the  temperature  of  the  air  to  be  =  16.7. 

"         "    force  of  vapor  in  the  air  to  be  =  12.07. 
Table  gives  for  16.7  the  factor  7.07. 

Then  12.07  X  7.07  =  85.3,  Relative  Humidity. 

B  36 


100 


FACTOR   -F-,    TO    COMPUTE    THE    RELATIVE    HUMIDITY. 


t  = 

Tenths  of  Degrees. 

Temp. 

of  Air, 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

». 

9. 

Centig. 

o 

-10 

48.1 

48.5 

48.9 

49.3 

49.7 

50.1 

50.5 

50.9 

51.4 

51.8 

9 

44.2 

44.6 

45.0 

45.4 

45.7 

46.1 

46.5 

46.9 

47.3 

47.7 

8 

40.7 

41.1 

41.4 

41.7 

42.1 

42.4 

42.8 

43.1 

43.5 

43.9 

7 

37.5 

37.8 

38.1 

38.4 

38.7 

39.0 

39.4 

39.7 

40.0 

40.4 

6 

34.6 

34.9 

35.2 

35.4 

35.7 

36.0 

36.3 

36.6 

36.9 

37.2 

5 

31.9 

32.2 

32.4 

32.7 

33.0 

33.2 

33.5 

33.8 

34.0 

34.3 

4 

29.5 

29.8 

30.0 

30.2 

30.5 

30.7 

31.0 

31.2 

31.4 

31.7 

3 

27.3 

27.5 

27.7 

27.9 

28.2 

28.4 

28.6 

28.8 

29.1 

29.3 

2 

25.3 

25.5 

25.7 

25.9 

26.1 

26.3 

26.5 

26.7 

26.9 

27.1 

1 

23.4 

23.6 

23.8 

24.2 

24.0 

24.3 

24.5 

24.7 

24.9 

25.1 

-0 

21.7 

21.9 

22.1 

22.2 

22.4 

22.6 

22.8 

22.9 

23.1 

23.3 

+0 

21.7 

21.6 

21.4 

21.3 

21.1 

21.0 

20.8 

20.7 

20.5 

20.4 

1 

20.2 

20.1 

20.0 

19.8 

19.7 

19.5 

19.4 

19.3 

19.1 

19.0 

2 

18.9 

18.7 

18.6 

18.5 

18.3 

18.2 

18.1 

18.0 

17.8 

17.7 

3 

17.6 

17.5 

17.3 

17.2 

17.1 

17.0 

16.9 

16.7 

16.6 

16.5 

4 

16.4 

16.3 

16.2 

16.1 

15.9 

15.8 

15.7 

15.6 

15.5 

15.4 

5 

15.3 

15.2 

15.1 

15.0 

14.9 

14.8 

14.7 

14.6 

14.5 

14.4 

6 

14.3 

14.2 

14.1 

14.0 

13.9 

13.8 

13.7 

13.6 

13.5 

13.4 

7 

13.4 

13.3 

13.2 

13.1 

13.0 

12.9 

12.8 

12.7 

12.6 

12.6 

8 

12.5 

12.4 

12.3 

12.2 

12.1 

12.1 

12.0 

11.9 

11.8 

11.7 

9 

11.7 

11.6 

11.5 

11.4 

11.4 

11.3 

11.2 

11.1 

11.1 

11.0 

10 

10.9 

10.8 

10.8 

10.7 

10.6 

10.6 

10.5 

10.4 

10.3 

10.3 

11 

10.2 

10.1 

10.1 

10.0 

9.95 

9.88 

9.82 

9.75 

9.69 

9.63 

12 

9.56 

9.50 

9.44 

9.38 

9.32 

9.26 

9.20 

9.13 

9.08 

9.02 

13 

8.96 

8.90 

8.84 

8.79 

8.73 

8.67 

8.62 

8.56 

8.51 

8.45 

14 

8.40 

8.34 

8.29 

8.24 

8.18 

8.15 

8.08 

8.03 

'7.98 

7.92 

15 

7.87 

7.82 

7.77 

7.72 

7.68 

7.63 

7.58 

7.53 

7.48 

7.43 

16 

7.39 

7.34 

7.29 

7.25 

7.20 

7.16 

7.11 

7.07 

7.02 

6.98 

17 

6.93 

6.89 

6.85 

6.80 

6.76 

6.72 

6.68 

6.63 

6.59 

6.55 

18 

6.51 

6.47 

6.43 

6.39 

6.35 

6.31 

6.27 

6.23 

6.19 

6.16 

19 

6.12 

6.08 

6.04 

6.00 

5.97 

5.93 

5.89 

5.86 

5.82 

5.79 

20 

5.75 

5.71 

5.68 

5.64 

5.61 

5.58 

5.54 

5.51 

5.47 

5.44 

21 

5.41 

5.37 

5.34 

5.31 

5.27 

5.24 

5.21 

5.18 

5.15 

5.12 

22 

5.09 

5.06 

5.02 

4.99 

4.96 

4.93 

4.90 

4.87 

4.85 

4.82 

23 

4.79 

4.76 

4.73 

4.70 

4.67 

4.65 

4.62 

4.59 

4.56 

4.53 

24 

4.51 

4.48 

4.45 

4.43 

4.40 

4.37 

4.35 

4.32 

4.30 

4.27 

25 

4.25 

4.22 

4.20 

4.17 

4.15 

4.12 

4.10 

4.07 

4.05 

4.03 

26 

4.00 

3.98 

3.95 

3.93 

3.91 

3.89 

3.86 

3.84 

3.82 

3.79 

27 

3.77 

3.75 

3.73 

3.71 

3.69 

3.66 

3.64 

3.62 

3.GO 

3.58 

28 

3.56 

3.54 

3.52 

3.50 

3.48 

3.46 

3.44 

3.42 

3.40 

3.38 

29 

3.36 

3.34 

3.32 

3.30 

3.28 

3.26 

3.24 

3.22 

3.21 

3.19 

30 

3.17 

3.15 

3.13 

3.12 

3.10 

3.08 

3.06 

3.05 

3.03 

3.01 

31 

2.99 

2.98 

2.96 

2.94 

2.93 

2.91 

2.89 

2.88 

2.86 

2.84 

32 

2.83 

2.81 

2.80 

2.78 

2.77 

2.75 

2.73 

2.72 

2.70 

2.69 

33 

2.67 

2.66 

2.64 

2.63 

2.61 

2.60 

2.58 

2.57 

2.56 

2.54 

34 

2.53 

2.51 

2.50 

2.49 

2.47 

2.46 

2.44 

2.43 

2.42 

2.40 

35 

2.39 

2.38 

2.36 

2.35 

2.34 

2.33 

2.31 

2.30 

2.29 

2.28 

B 


37 


TABLE     V. 


WEIGHT  OF  VAPOE,   IN   GRAMMES, 

CONTAINED  IN  A  CUBIC    METRE  OF  SATURATED  AIR  UNDER  A  BAROMETRIC   PRESSURE   OF 
760  MILLIMETRES,  AND  AT  TEMPERATURES  BETWEEN  —  20°  AND  ~\-AQ°  CENTIGRADE, 

THE  theoretic  density  of  aqueous  vapor  is  very  nearly  0.622,  or  f  ,  of  the  density  of 
the  air  at  the  same  temperature  and  pressure.  Regnault's  experiments  gave  similar 
results.  From  this  ratio  the  weight  of  the  vapor  contained  in  a  given  volume  of  air, 
the  temperature  and  humidity  of  which  are  known,  can  be  computed. 

If  we  call 

t  =  the  temperature  of  the  air  ; 

f  =  the  elastic  force  of  the  vapor  contained  in  the  air  at  the  time  of  the  observation  ; 
F  =  the  maximum  elastic  force  of  vapor  due  to  the  temperature  Z,  as  given  in  the 

table  ; 
p  —  the  weight  of  the  vapor  contained  in  a  litre  of  air  at  the  temperature  £,  and  with 

a  force  of  vapor/; 
P  —  the  weight  of  vapor  in  a  litre  of  air  at  the  temperature  Z,  and  at  full  saturation, 

or  F. 

rru  A*™    1.293223&r-  / 

Then'  P  =  °'622  1  +  0.00367*  '  760^7  ' 

In  which  1.293223  grammes  is  the  weight  of  a  litre  of  diy  air,  at  the  temperature 
of  zero  Centigrade,  and  under  a  barometric  pressure  of  760  millimetres,  according  to 
the  determination  of  Regnault  ;  0.00367,  the  coefficient  of  the  expansion  of  the  air 
as  found  by  the  same  ;  760  millimetres,  the  assumed  normal  barometric  pressure. 

The  weight  of  a  litre  of  air  given  by  Regnault  in  the  Memoires  de  Vlnstitut,  Tom. 
XXI.  p.  157,  is  1.293187  grammes  ;  but  by  correcting  a  slight  error  of  computation 
(see  E.  Ritter,  Memoires  de  la  Societe  Physique  de  Geneve,  Tom.  XIII.  p.  361),  it  be- 
comes, as  given  above,  1.293223  grammes. 

In  order  to  obtain  the  weight  of  vapor  in  a  cubic  metre,  or  1000  litres,  of  saturated 
air,  the  formula  becomes, 


=  0.628  , 


1  -[-0.0036 7  t     760mun- 

From  this  formula  Table  V.  has  been  computed.  The  tensions  due  to  the  tem- 
peratures in  the  first  column  are  placed  opposite  the  weights  of  vapor ;  they  are 
taken  from  Table  I.  It  will  be  seen  that,  throughout  the  table,  the  number  of 
grammes  of  vapor  nearly  corresponds  to  the  number  of  millimetres  of  pressure  ex- 
pressing the  tension. 

The  table  of  the  weights  of  vapor  given  in  Pouillet's  Elements  des  Physique,  Tom. 
II.  p.  707,  being  based  on  older  values,  gives  results  somewhat  different.  In  that  pub- 
lished by  Becquerel,  Elements  de  Physique  Terrestre,  p.  354,  Regnault's  tensions  and 
coefficient  of  expansion  of  the  air  have  been  used,  but  the  value  of  the  weight  of 
vapor  in  a  litre  of  air  formerly  determined  by  Biot  and  Arago,  viz.  1.29954  grammes, 
has  been  retained. 

B  38 


V.    WEIGHT  OF  VAPOE,  IN  GRAMMES, 

CONTAINED  IN  A  CUBIC  METRE   OP  SATURATED  AIR, 

At  Temperatures  between  —  20o  and  +40°  Centigrade. 


Temperature 
of 
Dew-Point. 

Force 
of 
Vapor. 

Weight 
Vapor. 

Difference. 

Temperature 
of 
Dew-Point. 

Force 
of 
Vapor. 

Weight 
of 
Vapor. 

Difference. 

Centigrade. 
-20° 

Millimetres. 
0.912 

Grammes. 
1.042 

Grammes. 

Centigrade. 
+10° 

Millimetres^ 
9.165 

Grammes. 
9.357 

Grammes. 

0.088 

0.605 

-19 

0.993 

1.130 

11 

9.792 

9.962 

-18 

1.080 

1.224 

0.094 

12 

10.457 

10.601 

0.639 

0.101 

0.675 

-17 

1.174 

.    1.325 

13 

11.162 

11.276 

-16 

1.275 

1.434 

0.109 

14 

11.908 

11.988 

0.712 

-15 

1.385 

1.551 

0.118 

15 

12.699 

12.739 

0.751 

-14 

1.503 

1.678 

0.127 

16 

13.536 

13.532 

0.793 

0.134 

0.835 

-13 

1.631 

1.813 

17 

14.421 

14.367 

-12 

1.768 

1.957 

0.145 

18 

15.357 

15.247 

0.880 

-11 

1.918 

2.114 

0.157 

19 

16.346 

16.173 

0.926 

-10 

2.078 

2.283 

0.169 

20 

17.391 

17.148 

0.975 

-  9 

2.261 

2.475 

0.192 

21 

18.495 

18.174 

1.026 

-  8 

2.456 

2.678 

0.203 

22 

19.659 

19.253 

1.078 

-  7 

2.666 

2.896 

0.218 

23 

20.888 

20.387 

1.134 

-  6 

2.890 

3.128 

0.232 

24 

22.184 

21.579 

1.192 

-  5 

3.131 

3.376 

0.248 

25 

23.550 

22.831 

.252 

-  4 

3.387 

3.638 

0.262 

26 

24.988 

24.144 

.313 

-  3 

3.662 

3.919 

0.281 

27 

26.505 

25.524 

.380 

0.298 

.447 

-  2 

3.955 

4.217 

28 

28.101 

26.971 

-  1 

4.267 

4.534 

0.317 

29 

29.782 

28.489 

.519 

0 

4.600 

4.869 

0.334 

30 

31.548 

30.079 

1.589 

+  1 

4.940 

5.209 

0.341 

31 

33.405 

31.744 

1.666 

2 

5.302 

5.571 

0.361 

32 

35.359 

33.491 

1.747 

3 

5.687 

5.953 

0.383 

33 

37.410 

35.317 

1.827 

4 

6.097 

6.360 

0.406 

34 

39.565 

37.230 

1.913 

5 

6.534 

6.791 

0.431 

35 

41.827 

39.231 

2.001 

6 

6.998 

7.247 

0.456 

36 

44.201 

41.323 

2.092 

7 

7.492 

7.731 

0.484 

37 

46.691 

43.510 

2.187 

8 

8.017 

8.243 

0.512 

38 

49.302 

45.795 

2.285 

9 

8.574 

8.785 

0.541 

39 

52.039 

48.182 

2.387 

+10 

9.165 

9.357 

0.572 

+40 

54.906 

50.674 

2.492 

B 


39 


PRACTICAL     TABLES, 


IN 


ENGLISH    MEASURES, 


BASED   ON   REGNAULT'S   HYGROMETRICAL    CONSTANTS. 


B  41 


VI. 


TABLE  OF  THE  ELASTIC  FORCE  OF  AQUEOUS  VAPOR, 

EXPRESSED   IN   ENGLISH    INCHES    OF    MERCURY   FOR   TEMPERATURES    OF    FAHRENHEIT, 
REDUCED    FROM    REGNAULT'S   TABLE. 


THE  values  of  the  elastic  force  of  vapor  furnished  by  V.  Regnault,  which  are 
found  in  Table  I.  of  this  Hygrometrical  set,  are  derived  from  a  series  of  experiments 
conducted,  during  several  years,  with  great  care,  consummate  skill,  and  all  the  means 
of  precision  which  are  at  the  disposal  of  modern  science.  The  methods  of  investi- 
gation, and  all  the  steps  in  each  experiment,  were  minutely  described  and  submitted 
to  the  judgment  of  the  scientific,  successively  in  separate  papers  in  several  volumes 
of  the  Annales  de  Chimie  et  de  Physique,  and  collectively  in  his  final  Report  to  the 
Minister  of  Public  Works,  (see  above,  p.  9,)  which  fills  Volume  XXI.  of  the  Me- 
moires  de  VInstitut  de  France.  The  confidence  which  has  been  deservedly  granted 
to  these  determinations  by  nearly  all  scientific  men,  is  increased  by  the  fact  that  one 
of  the  best  physicists  and  experimenters  in  Germany,  Professor  Magnus,  came, 
about  the  same  time,  to  results  so  little  different,  that  both  tables,  for  most  purposes, 
may  be  considered  identical.  (Compare  below,  Table  XXII.)  It  seems,  therefore, 
that  these  values  ought  to  be  used  in  our  hygrometrical  tables,  as  has  been  done 
in  France,  in  preference  to  the  older  and  less  reliable  determinations  on  which  they 
are  based. 

Though  Regnault's  table  of  the  elastic  force  of  vapor  is  considered,  even,  it  is  be- 
lieved, by  a  majority  of  scientific  men  in  England,  as  the  most  reliable  which  science 
now  possesses,  the  author  is  not  aware  that  any  extensive  reduction  of  it  to  English 
measures,  such  as  is  wanted  for  meteorological  purposes,  has  been  as  yet  published  ; 
still  less  a  series  of  tables  based  on  these  values.  Such  a  set  of  hygrometrical  tables 
in  English  measures,  corresponding  to  the  preceding  one  in  French  measures,  is 
offered  here,  which,  it  is  hoped,  supplies  a  real  want  felt  by  a  large  number  of  me- 
teorologists. 

Table  VI.  is  Regnault's  Table  of  the  Elastic  Force  of  Vapor  as  given  in  Table  I., 
reduced  to  English  measures,  in  which  the  fourth  decimal  is  given  in  order  to  secure 
the  third,  and  otherwise  to  facilitate  the  computations.  From  these  values  Tables 
VII.  to  X.  have  been  computed. 


B  42 


VI.  ELASTIC  FORCE  OF  AQUEOUS  VAPOR, 

EXPRESSED  IN  ENGLISH  INCHES  or  MEECUEY  FOE  TEMPERATURES  OF  FAHRENHEIT. 
REDUCED  FEOM  REGNAULT'S  TABLE. 


Temper- 
ature 
Fahren- 
heit. 

Force  of  Vapor. 

Temper- 
ature 
Fahren- 
heit. 

Force  of  Vapor. 

Temper- 
ature 
Fahren- 
heit. 

Force  of  Vapor. 

Temper- 
ature 
Fahren- 
heit. 

Force  of  Vapor. 

Tenths  of  Degrees. 

Tenths  of  Degrees. 

Tenths  of  Degrees. 

Tenths  of  Degrees. 

0 

0.5 

Eng.  In. 
0.0085 

0 

0.5 

0 

O.5 

0 

0.5 

Eng.  In. 
0.0485 

-31 

Eng.  In. 
0.0037 

-19 

Eng.  In. 
0.0171 

Eng.  In. 
0.0167 

-  8 

Eng.  In. 
0.0297 

Eng.  In. 
0.0290 

+  2 

Eng.  In. 
0.0476 

-30 

0.0092 

0.0090 

-18 

0.0181 

0.0176 

-  7 

0.0312 

0.0304 

3 

0.0498 

0.0510 

-29 

0.0098 

0.0095 

-17 

0.0190 

0.0185 

-  6 

0.0327 

0.0319 

4 

0.0521 

0.0533 

-28 

0.0104 

0.0101 

-16 

0.0200 

0.0195 

-  5 

0.0343 

0.0335 

5 

0.0545 

0.0558 

-27 

0.0110 

0.0107 

-15 

0.0210 

0.0205 

-  4 

0.0359 

0.0351 

6 

0.0570 

0.0584 

-26 

0.0117 

0.0114 

-14 

0.0221 

0.0216 

-  3 

0.0376 

0.0368 

7 

0.0597 

0.0611 

-25 

0.0124 

0.0120 

-13 

0.0232 

0.0227 

-  2 

0.0395 

0.0386 

8 

0.0625 

0.0639 

-24 

0.0131 

0.0127 

-12 

0.0244 

0.0238 

-  1 

0.0414 

0.0404 

9 

0.0654 

0.0669 

-23 

0.0138 

0.0135 

-11 

0.0257 

0.0250 

-  0 

0.0434 

0.0424 

10 

0.0684 

0.0700 

-22 

0.0146 

0.0142 

-10 

0.0270 

0.0263 

+  o 

0.0434 

0.0444 

11 

0.0716 

0.0732 

-21 

0.0154 

0.0150 

-  9 

0.0283 

0.0276 

+  1 

0.0454 

0.0465 

12 

0.0749 

0.0766 

-20 

0.0163 

0.0158 

-  8 

0.0297 

0.0290 

+  2 

0.0476 

0.0487 

+13 

0.0783 

0.0800 

Temper- 
ature 
Fahren- 
heit. 

Tenths  of  Degrees. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

8. 

9. 

0 

14 

Eng.  In. 
0.0818 

Eng.  In. 
0.0822 

Eng.  In. 
0.0826 

Eng.  In. 
O.OS30 

Eng.  In. 
0.0834 

Eng.  In. 
0.0837 

En 
0. 

g.  In. 
0841 

Eng.  In. 
0.0845 

Eng.  In. 
0.0849 

Eng.  In. 
0.0853 

15 

0.0857 

0.0861 

0.0865 

0.0869 

0.0873 

0.0877 

0. 

0881 

0.0885 

0.0889 

0.0893 

16 

0.0898 

0.0902 

0.0906 

0.0910 

0.0914 

0.0918 

0.0923 

0.0927 

0.0931 

0.0936 

17 

0.0940 

0.0944 

0.0949 

0.0953 

0.0958 

0.0962 

0.0967 

0.0971 

0.0975 

0.0980 

18 

0.0984 

0.0989 

0.0993 

0.0998 

0.1002 

0.1007 

0. 

1012 

0.1016 

0.1021 

0.1025 

19 

0.1030 

0.1035 

0.1040 

0.1044 

0.1049 

0.1054 

0.1059 

0.1064 

0.1068 

0.1073 

20 

0.1078 

0.1083 

0.1088 

0.1093 

0.1098 

0.1103 

0.1108 

0.1113 

0.1118 

0.1123 

21 

0.1128 

0.1133 

0.1138 

0.1143 

0.1148 

0.1153 

0. 

1159 

0.1164 

0.1169 

0.1174 

22 

0.1179 

0.1185 

0.1190 

0.1195 

0.1200 

0.1206 

0. 

1211 

0.1217 

0.1222 

0.1227 

23 

0.1233 

0.1238 

0.1244 

0.1249 

0.1255 

0.1260 

0. 

1266 

0.1272 

0.1277 

0.1283 

24 

0.1289 

0.1295 

0.1300 

0.1306 

0.1312 

0.1318 

0. 

1324 

0.1329 

0.1335 

0.1341 

25 

0.1347 

0.1353 

0.1359 

0.1365 

0.1371 

0.1377 

0. 

1383 

0.1389 

0.1395 

0.1401 

26 

0.1407 

0.1413 

0.1419 

0.1426 

0.1432 

0.1438 

0. 

1444 

0.1450 

0.1457 

0.1463 

27 

0.1469 

0.1476 

0.1482 

0.1488 

0.1495 

0.1501 

0. 

1508 

0.1514 

0.1521 

0.1527 

28 

0.1534 

0.1540 

0.1547 

0.1553 

0.1560 

0.1567 

0. 

1573 

0.1580 

0.1587 

0.1593 

29 

0.1600 

0.1607 

0.1613 

0.1620 

0.1627 

0.1634 

0.1641 

0.1647 

0.1654 

0.1661 

30 

0.1668 

0.1675 

0.1682 

0.1689 

0.1696 

0.1703 

0. 

1710 

0.1717 

0.1724 

0.1732 

31 

0.1739 

0.1746 

0.1753 

0.1760 

0.1767 

0.1775 

0.1782 

0.1789 

0.1796 

0.1804 

O. 

1. 

2. 

3. 

4. 

5. 

G. 

7. 

§. 

9. 

B 


43 


2  ELASTIC  FORCE  OF  AQUEOUS  VAPOR. REGNAULT. 

EXPRESSED  IN  ENGLISH  INCHES  OF  MERCURY  FOR  TEMPERATURES  OF  FAHRENHEIT. 


Tenths  of  Degrees. 

Tempera- 

ture of 
Fahren- 

heit. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

32 

0.1811 

0.1818 

0.1825 

0.1833 

0.1840 

0.1847 

0.1854 

0.1861 

0.1869 

0.1876 

33 

0.1883 

0.1891 

0.1898 

0.1906 

0.1913 

0.1921 

0.1928 

0.1936 

0.1944 

0.1951 

34 

0.1959 

0.1967 

0.1974 

0.1982 

0.1990 

0.1998 

0.2006 

0.2013 

0.2021 

0.2029 

35 

0.2037 

0.2045 

0.2053 

0.2061 

0.2070 

0.2077 

0.2086 

0.2094 

0.2102 

0.2111 

36 

0.2119 

0.2127 

0.2135 

0.2144 

0.2152 

0.2161 

0.2169 

0.2178 

0.2186 

0.2195 

37 

0.2204 

0.2212 

0.2221 

0.2230 

0.2238 

0.2247 

0.2256 

0.2265 

0.2273 

0.2282 

38 

0.2291 

0.2300 

0.2309 

0.2318 

0.2327 

0.2336 

0.2345 

0.2354 

0.2364 

0.2373 

39 

0.2382 

0.2391 

0.2400 

0.2410 

0.2419 

0.2428 

0.2438 

0.2447 

0.2457 

0.2466 

40 

0.2476 

0.2485 

0.2495 

0.2504 

0.2514 

0.2524 

0.2533 

0.2543 

0.2553 

0.2563 

41 

0.2572 

0.2582 

0.2592 

0.2602 

0.2612 

0.2622 

0.2632 

0.2642 

0.2652 

0.2662 

42 

0.2672 

0.2682 

0.2692 

0.2702 

0.2713 

0.2723 

0.2733 

0.2744 

0.2754 

0.2764 

43 

0.2775 

0.2785 

0.2796 

0.2807 

0.2817 

0.2828 

0.2839 

0.2850 

0.2860 

0.2871 

44 

0.2882 

0.2893 

0.2904 

0.2915 

0.2926 

0.2937 

0.2948 

0.2960 

0.2971 

0.2982 

45 

0.2993 

0.3005 

0.3016 

0.3028 

0.3039 

0.3050 

0.3062 

0.3074 

0.3085 

0.3097 

46 

0.3108 

0.3120 

0.3132 

0.3144 

0.3156 

0.3168 

0.3179 

0.3191 

0.3203 

0.3215 

47 

0.3228 

0.3240 

0.3252 

0.3264 

0.3276 

0.3289 

0.3301 

0.3313 

0.3326 

0.3338 

48 

0.3351 

0.3363 

0.3376 

0.3388 

0.3401 

0.3414 

0.3426 

0.3439 

0.3452 

0.3465 

49 

0.3477 

0.3490 

0.3503 

0.3516 

0.3529 

0.3542 

0.3556 

0.3569 

0.3582 

0.3595 

50 

0.3608 

0.3622 

0.3635 

0.3648 

0.3661 

0.3675 

0.3688 

0.3702 

0.3715 

0.3729 

51 

0.3743 

0.3756 

0.3770 

0.3784 

0.3798 

0.3812 

0.3826 

0.3840 

0.3854 

0.3868 

52 

0.3882 

0.3896 

0.3911 

0.3925 

0.3939 

0.3954 

0.3968 

0.3983 

0.3997 

0.4012 

53 

0.4027 

0.4041 

0.4056 

0.4071 

0.4086 

0.4101 

0.4116 

0.4131 

0.4146 

0.4161 

54 

0.4176 

0.4191 

0.4207 

0.4222 

0.4237 

0.4253 

0.4268 

0.4284 

0.4299 

0.4315 

55 

0.4331 

0.4346 

0.4362 

0.4378 

0.4394 

0.4410 

0.4426 

0.4442 

0.4458 

0.4474 

56 

0.4490 

0.4507 

0.4523 

0.4539 

0.4556 

0.4572 

0.4589 

0.4605 

0.4622 

0.4638 

57 

0.4655 

0.4672 

0.4689 

0.4705 

0.4722 

0.4739 

0.4756 

0.4773 

0.4791 

0.4808 

58 

0.4825 

0.4842 

0.4859 

0.4876 

0.4894 

0.4912 

0.4929 

0.4947 

0.4964 

0.4982 

59 

0.5000 

0.5017 

0.5035 

0.5053 

0.5071 

0.5089 

0.5107 

0.5125 

0.5143 

0.5161 

60 

0.5179 

0.5198 

0.5216 

0.5234 

0.5253 

0.5271 

0.5290 

0.5301 

0.5328 

0.5346 

61 

0.5365 

0.5384 

0.5403 

0.5422 

0.5441 

0.5461 

0.5480 

0.5499 

0.5519 

0.5538 

62 

0.5558 

0.5577 

0.5597 

0.5617 

0.5636 

0.5656 

0.5676 

0.5696 

0.5716 

0.5736 

63 

0.5756 

0.5777 

0.5797 

0.5817 

0.5838 

0.5858 

0.5879 

0.5899 

0.5920 

0.5941 

64 

0.5962 

0.5983 

0.6004 

0.6025 

0.6046 

0.6067 

0.6088 

0.6109 

0.0131 

0.6152 

65 

0.6173 

0.6195 

0.6217 

0.623S 

0.6260 

0.6282 

0.6304 

0.6325 

0.6347 

0.6369 

66 

0.6392 

0.6414 

0.6436 

0.6458 

0.6481 

0.6503 

0.6525 

0.6548 

0.6571 

0.6593 

67 

0.6616 

0.6639 

0.6662 

0.6685 

0.6708 

0.6731 

0.6754 

0.6777 

0.6800 

0.6824 

O. 

1.    2.    3. 

4. 

5. 

6. 

7. 

§. 

0. 

B 


44 


ELASTIC    FORCE    OF   AQUEOUS    VAPOR. REGNAULT.  3 

EXPRESSED  IN  ENGLISH  INCHES  or  MERCURY  FOR  TEMPERATURES  OF  FAHRENHEIT. 


Tempera- 
ture of 
Fahren- 
heit. 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5.    6. 

7. 

8. 

9. 

0 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

68 

0.6347 

0.6870 

0.6894 

0.6917 

0.6941 

0.6965 

0.6989 

0.7012 

0.7036 

0.7060 

69 

0.7084 

0.7108 

0.7133 

0.7157 

0.7181 

0.7206 

0.7230 

0.7255 

0.7280 

0.7305 

70 

0.7329 

0.7354 

0.7379 

0.7405 

0.7430 

0.7455 

0.7480 

0.7506 

0.7531 

0.7557 

71 

0.7583 

0.7609 

0.7634 

0.7660 

0.7686 

0.7712 

0.7739 

0.7765 

0.7791 

0.7818 

72 

0.7844 

0.7871 

0.7897 

0.7924 

0.7951 

0.7978 

0.8005 

0.8032 

0.8059 

0.8086 

73 

0.8113 

0.8141 

0.8168 

0.8196 

0.8223 

0.8251 

0.8279 

0.8307 

0.8335 

0.8363 

74 

0.8391 

0.8419 

0.8447 

0.8476 

0.8504 

0.8533 

0.8561 

0.8590 

0.8619 

0.8648 

75 

0.8676 

0.8705 

0.8735 

0.8764 

0.8793 

0.8822 

0.8852 

0.8881 

0.8911 

0.8940 

76 

0.8970 

0.9000 

0.9030 

0.9060 

0.9090 

0.9120 

0.9150 

0.9180 

0.9211 

0.9241 

77 

0.9272 

0.9302 

0.9333 

0.9364 

0.9395 

0.9426 

0.9457 

0.9488 

0.9519 

0.9550 

78 

0.9582 

0.9613 

0.9645 

0.9677 

0.9709 

0.9740 

0.9773 

0.9805 

0.9837 

0.9869 

79 

0.9902 

0.9934 

0.9967 

1.0000 

1.0033 

1.0065 

1.0099 

1.0132 

1.0165 

1.0198 

80 

1.0232 

1.0265 

1.0299 

1.0332 

1.0366 

1.0400 

1.0434 

1.0468 

1.0503 

1.0537 

81 

1.0572 

1.0606 

1.0641 

1.0675 

1.0710 

1.0745 

1.0780 

1.0815 

1.0851 

1.0886 

82 

1.0922 

1.0957 

1.0993 

1.1028 

1.1064 

1.1100 

1.1136 

1.1172 

1.1209 

1.1245 

83 

1.1281 

1.1318 

1.1354 

1.1391 

1.1428 

1.1465 

1.1502 

1.1539 

1.1576 

1.1614 

84 

1.1651 

1.1689 

1.1726 

1.1764 

1.1802 

1.1840 

1.1878 

1.1916 

1.1954 

1.1993 

85 

1.2031 

1.2070 

1.2108 

1.2147 

1.2186 

1.2225 

1.2264 

1.2303 

1.2342 

1.2381 

86 

1.2421 

1.2460 

1.2500 

1.2540 

1.2580 

1.2620 

1.2660 

1.2700 

1.2740 

1.2781 

87 

1.2821 

1.2862 

1.2903 

1.2944 

1.2985 

1.3026 

1.3068 

1.3109 

1.3151 

1.3192 

88 

1.3234 

1.3276 

1.3318 

1.3361 

1.3403 

1.3445 

1.3488 

1.3531 

1.3573 

1.3616 

89 

1.3659 

1.3703 

1.3746 

1.3789 

1.3833 

1.3877 

1.3920 

1.3964 

1.4008 

1.4053 

,  90 

1.4097 

1.4141 

1.4186 

1.4230 

1.4275 

1.4320 

1.4365 

1.4410 

1.4456 

1.4501 

91 

1.4546 

1.4592 

1.4638 

1.4684 

1.4730 

1.4776 

1.4822 

1.4869 

1.4915 

1.4962 

92 

1.5008 

1.5055 

1.5102 

1.5149 

1.5197 

1.5244 

1.5291 

1.5339 

1.5387 

1.5435 

93 

1.5482 

1.5531 

1.5579 

1.5627 

1.5676 

1.5724 

1.5773 

1.5822 

1.5871 

1.5920 

94 

1.5969 

1.6018 

1.6068 

1.6117 

1.6167 

1.6217 

1.6267 

1.6317 

1.6367 

1.6417 

95 

1.6468 

1.6518 

1.6569 

1.6620 

1.6671 

1.6722 

1.6773 

1.6825 

1.6876 

1.6928 

96 

1.6980 

1.7032 

1.7084 

1.7137 

1.7189 

1.7242 

1.7295 

1.7348 

1.7401 

1.7454 

97 

1.7508 

1.7561 

1.7615 

1.7669 

1.7723 

1.7777 

1.7831 

1.7886 

1.7940 

1.7995 

98 

1.8050 

1.8105 

1.8160 

1.8215 

1.8271 

1.8327 

1.8382 

1.8438 

1.8494 

1.8551 

99 

1.8607 

1.8664 

1.8720 

1.8777 

1.8834 

1.8891 

1.8949 

1.9006 

1.9064 

1.9121 

100 

1.9179 

1.9237 

1.9295 

1.9354 

1.9412 

1.9471 

1.9530 

1.9589 

1.9648 

1.9707 

101 

1.9766 

1.9826 

1.9885 

1.9945 

2.0005 

2.0065 

2.0126 

2.0186 

2.0247 

2.0307 

102 

2.0368 

2.0429 

2.0490 

2.0552 

2.0613 

2.0675 

2.0737 

2.0798 

2.0861 

2.0923 

103 

2.0985 

2.1048 

2.1110 

2.1173 

2.1236 

2.1299 

2.1362 

2.1426 

2.1489 

2.1553 

104 

2.1617 

2.1681 

2.1745 

2.1810 

2.1874 

2.1939 

2.2004 

2.2069 

2.2135 

2.2200 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

B 


45 


VII. 


PSYCHROMETRICAL  TABLES, 

GIVING,    IN    ENGLISH    INCHES    OF    MERCURY,  THE    ELASTIC    FORCE    OF  VAPOR   CONTAINED 
IN    THE    AIR,  AND  ITS  RELATIVE  HUMIDITY  IN  HUNDREDTHS  J 


DERIVED   FROM   THE    INDICATIONS    OP   THE  WET   AND    DRY    BULB   THERMOMETERS, 
IN   DEGREES   OF    FAHRENHEIT. 


BY  A.  GUYOT.* 


M.  V.  REGNAULT,  in  his  Etudes  sur  rHygrometrie  Annales  de  Chimie  et  de  Phy- 
sique, 3me  serie,  Tom.  XV.  p.  129,  after  having  discussed  the  theoretical  bases  of  the 
psychrometric  formula  given  by  August,  and  modified  the  numerical  values  of  some 
of  its  coefficients,  adopts  the  formula 

0.480  Q-0 
610  —  t> 

for  temperatures  above  the  freezing-point ;  and  when  the  temperature  of  the  wet  ther- 
mometer is  below  the  freezing-point,  the  bulb  being  covered  with  a  film  of  ice, 

0.480  (t  -  Q 
X=J  -  689  -  t' 

*  While  this  table  was  going  through  the  press,  a  similar  one,  prepared  by  Prof.  T.  H.  Coffin  for 
his  private  use,  was  published  by  the  Smithsonian  Institution,  in  order  to  meet  an  urgent  demand 
from  many  quarters.  Being  based  on  the  same  formula,  it  gives  the  same  results,  except,  perhaps,  in 
degrees  below  14°  Fahrenheit,  where  the  tables  show  slight  discrepancies.  These  unimportant 
differences  arise  from  the  fact  that  Prof.  Coffin's  table  was  computed  from  Regnault's  tensions,  as 
given  in  the  first  edition  of  this  collection,  while  the  author's  table  is  based  on  the  table  of  tensions  a 
given  in  this  second  edition,  in  which  the  values  below  14°  Fahrenheit  have  been  somewhat  modified, 
for  reasons  given  above.  The  following  table  gives  also  the  relative  humidity  with  one  more  decimal,] 
which  makes  the  interpolations  more  easy ;  and  a  column  of  differences  for  finding  the  values  for 
fractions  of  I'.  A  table  for  reducing  the  results  to  another  barometric  height  is  added  at  the  end  of 
the  table. 

B  46 


PSYCHROMETRICAL   TABLES. 

in  which 

x   represents  the  force  of  vapor  in  the  air  at  the  time  of  the  observation  ; 

Z,  the   temperature  of  the  air  in  Centigrade  degrees,  indicated  by  the  dry 

thermometer  ; 

t',  the  temperature  of  evaporation  given  by  the  wet  thermometer  ; 
/,  the  force  of  vapor  in  a  saturated  air  at  the  temperature  t'  ; 
A,  the  height  of  the  barometer. 

Substituting  the  Fahrenheit  scale  for  the  Centigrade,  the  formula,  for  temperatures 
above  the  freezing-point,  reads 

-__  0.480  X  |  (<  —  t1)    ,     _  f  __  Q.480  (<  —  *')   ,  . 
~J     "  610—  fC'  —  32°)        ~J  "          1130—  t' 

and  below  the  freezing-point, 

0.480X1  (*-<Q    ,  _  .    ,  __  0.480  ft-*') 
689—  f(Z'  —  32°)  •?  1240.2—  «' 

Making,  further,  h  =  29.7  English  inches,  these  formulae  become 


and 


0.480  (<-Q  14.256  (<-</) 

-/•         1180  -«'  -•'"          1130  -  </ 


0.480  0-Q  14.256  (t  -  f 

J  1240.2  —  t'  J  1240.2  —  t' 


The  mean  barometric  pressure  for  which  the  table  has  been  computed,  viz.  29.7 
inches,  is,  within  a  small  fraction,  the  same  as  that  adopted  in  Haeghens's  Tables, 
No.  II.,  which  is  755  millimetres  =  29.725  Eng.  inches.  As  that  slight  difference 
in  the  barometric  pressure  cannot  cause,  in  the  most  extreme  cases,  a  difference  ex- 
ceeding two  thousandths  of  an  inch  in  the  elastic  forces,  the  results  in  the  two  tables 
may  be  considered  identical. 

That  barometric  pressure,  corresponding,  in  our  latitudes,  to  a  mean  altitude  of  250 
to  300  feet  above  the  sea,  is  likely  to  suit,  without  correction,  the  largest  number  of 
meteorological  stations.  Should  the  mean  height  of  the  barometer,  in  consequence 
of  the  elevation  of  the  station,  much  differ  from  that  adopted  in  the  table,  a  constant 
correction  can  be  determined,  to  be  applied  to  the  numbers  in  the  table.  At  the  end, 
page  72,  will  be  found  a  table  which  furnishes  that  correction  for  barometric  heights 
between  20  and  31  inches,  and  for  values  of  t  —  t'  between  2°  and  26°  Fahrenheit. 

The  effect  of  the  irregular  variations  of  the  barometer  at  the  same  station  can,  in 
most  cases,  be  neglected  ;  for  the  error  due  to  that  cause  will  scarcely  ever  exceed 
those  which  may  arise  from  the  uncertainty  of  the  very  elements  on  which  the  tables 
are  based. 

B  47 


PSYCHROMETRICAL  TABLES. 

ARRANGEMENT  OF  THE  TABLES. 

The  same  arrangement  as  is  found  in  the  Psychrometrical  for  the  Centigrade  scale 
nas  been  adopted. 

The  first  column  at  the  left  contains  the  indications  of  the  wet-bulb  thermometer, 
from  — 31°  to  105°  Fahrenheit. 

The  second  column  gives  the  differences  of  the  force  of  vapor  for  each  tenth  of  a 
degree,  between  each  two  consecutive  full  degrees  in  the  first  column.  It  enables  the 
observer  easily  to  find  the  values  for  the  fractions  of  degrees  of  the  wet  thermometer. 

The  following  double  columns  furnish  the  forces  of  vapor  and  the  relative  humidity 
corresponding  to  each  full  degree  of  the  wet-bulb  thermometer  given  in  the  first 
column  in  the  same  horizontal  line,  and  to  the  difference  of  the  two  thermometers, 
or  t  —  £',  found  at  the  head  of  each  column,  for  every  half-degree  from  0°  to  26°. 5. 
The  relative  humidity,  or  the  fraction  of  saturation,  is  given  in  hundredths,  which  is 
near  enough  for  meteorological  purposes  ;  but  one  decimal  more  has  been  added, 
though  separated  by  a  point,  in  order  to  facilitate  the  interpolations. 

At  the  bottom  of  each  page  is  found  the  mean  difference,  for  each  tenth  of  a  degree, 
between  the  forces  of  vapor  on  the  same  line.  It  gives  the  means  of  finding  the 
values  for  the  intermediate  differences  of  t  —  £',  not  found  in  the  tables. 

USE  OF  THE  TABLES. 

Enter  the  tables  with  the  difference  of  the  two  thermometers,  or  t  —  t',  and  the 
temperature  of  the  wet-bulb  thermometer,  given  by  observation. 

In  the  column  headed  by  the  observed  difference  of  the  thermometer,  t  —  t1,  and 
on  the  horizontal  line  headed  by  the  observed  temperature  of  the  wet  thermometer,  t', 
are  found  the  force  of  vapor,  and  the  relative  humidity  corresponding  to  these  tem- 
peratures. 

For  the  fractions  of  degrees  of  the  wet  thermometer,  multiply  the  decimal  fraction 
by  the  number  placed  in  the  second  column  between  the  full  degree  and  the  next, 
and  add  the  product  if  the  temperature  is  above,  and  subtract  it  if  it  is  below  zero 
Fahrenheit. 

The  intermediate  values  of  t  —  t1  not  given  in  the  table  are  found  by  subtracting 
the  number  in  the  line  at  the  bottom  of  the  page,  multiplied  by  the  number  of  addi- 
tional tenths,  from  the  value  given  in  the  table.  This  correction,  being  always  very 
small,  can  usually  be  neglected. 

For  the  relative  humidity,  interpolations  at  sight  will  generally  suffice. 

Examples. 

1.  Dry  thermometer,      t  =  50°  F. 

Wet  thermometer,      t1  =  43°  F. 

Difference,  or  t  —  t1  ==    7°  F. 

Page  58,  we  find  for  t  —  t'  =-  T  in  the  third  double  column,  and  for  t1  =  43°  in 
the  first  column 

Force  of  vapor  in  the  air  =  0.186  inch. 

Relative  humidity  in  hundredths  =  51 
B  48 


PSYCHROMETRICAL    TABLES. 

2.  Dry  thermometer,  t  =  88°.5  F. 

Wet  thermometer,  t'  =  76°.3  F. 

Difference,  t  —  t'  =  12°. 2  F. 

Page  63,  Table  gives  for  t  —  l'=12  and  t1  =  76°          =      0.735  inch. 
Add  for  fraction  of  t1  =  0.3,  0.003  X  3  —      0.009 

Subtract  for  fraction  of  t  —  t'  =  0°.2,  .0013  X  2  =  —0.003 

Force  of  vapor  in  the  air  =      0.741 
Relative  humidity  =      55 


3.  Dry  thermometer,  t  =  —  4°. 5  F. 

Wet  thermometer,  t'  =        6°.0  F. 

Difference,  t  —  t'—        T.5  F. 

Page  50,  Table  gives  for  t  —  t'=  1°.5  and  t'  =  —  6°  =  0.016  inch. 
Subtract  for  fraction  of  t1  =  0.5,  0.0002  X  5  =  —  0.001 

Force  of  vapor  in  the  air  =  0.015 
Relative  humidity  =  45 


B  49 


VII.    PSYCHROMETRICAL   TABLES. 
Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —Relative  Humidity  in  Hundredth^. 


t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

TTTof 

Mfan 

t',  below  the  Freezing-Point  ;  the  Bulb  covered  with  a  Film  of  Ice. 

wet/- 

Bulb 

ivi  can 
Vertical 

Thermo- 

Difference 

o°.o 

0°.5 

1°.0 

1°.5 

2°.O 

2°.5 

meter 

of  Force 

V 

of  Vapor 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

0°.l. 

?orce  of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force  of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

-31 

0.009 

100 

0.003 

36.0 

-30 

.00005 

0.009 

100 

0.004 

39.6 

-29 

.00006 

0.010 

100 

0.004 

42.9 

-28 

.00006 

0.010 

100 

0.005 

46.1 

-27 

.00006 

0.011 

100 

0.006 

49.0 

.00006 

-26 

0.012 

100 

0.006 

51.8 

-25 

.00007 

0.012 

100 

0.007 

54.4 

-24 

.00007 

0.013 

100 

0.008 

56.8 

-23 

.00008 

0.014 

100 

0.008 

59.0 

-22 

.00008 

0.015 

100 

0.009 

61.0 

.00008 

-21 

0.015 

100 

0.010 

62.6 

0.004 

26.9 

-20 

.00008 

0.016 

100 

0.011 

64.2 

0.005 

30.3 

-19 

.00008 

0.017 

100 

0.012 

65.9 

0.006 

33.5 

-18 

.00009 

0.018 

100 

0.012 

67.5 

0.007 

36.6 

-17 

.0001 

0.019 

100 

0.013 

69.0 

0.008 

39.5 

.0001 

-16 

0.020 

100 

0.014 

70.4 

0.009 

42.3 

-15 

.0001 

0.021 

100 

0.015 

71.8 

0.010 

44.9 

0.004 

19.4 

-14 

.0001 

0.022 

100 

0.017 

73.0 

0.011 

47.4 

0.005 

23.0 

-13 

.0001 

0.023 

100 

0.018 

74.3 

0.012 

49.8 

0.007 

26.4 

-12 

.0001 

0.024 

100 

0.019 

75.4 

0.013 

51.9 

0.008 

29.5 

.0001 

-11 

0.026 

100 

0.020 

76.5 

0.014 

53.9 

0.009 

32.5 

-10 

.0001 

0.027 

100 

0.021 

77.5 

0.016 

55.7 

0.010 

35.3 

0.005 

15.6 

-  9 

.0001 

0.028 

100 

0.023 

78.5 

0.017 

57.7 

0.012 

38.3 

0.006 

19.1 

-  8 

.0001 

0.030 

100 

0.024 

79.4 

0.018 

59.4 

0.013 

40.6 

0.007 

22.5 

-  7 

.0001 

0.031 

100 

0.026 

80.3 

0.020 

61.1 

0.014 

43.0 

0.009 

25.7 

-  6 

.0001 

0.033 

100 

0.027 

81.1 

0.021 

62.7 

0.016 

45.4 

0.010 

28.4 

0.005 

12.9 

.0002 

-  5 

0.034 

100 

0.029 

81.8 

0.023 

64.5 

0.017 

47.6 

0.012 

31.7 

0.006 

16.4 

-  4 

.0002 

0.036 

100 

0.030 

82.5 

0.025 

65.8 

0.019 

49.8 

0.014 

34.5 

0.008 

19.8 

-  3 

.0002 

0.038 

100 

0.032 

83.2 

0.026 

67.1 

0.021 

51.7 

0.015 

36.9 

0.010 

22.8 

-  2 

.0002 

0.039 

100 

0.034 

83.9 

0.028 

68.3 

0.023 

53.5 

0.017 

39.3 

0.011 

25.8 

-  1 

.0002 

0.041 

100 

0.036 

84.5 

0.030 

69.5 

0.024 

55.3 

0.019 

41.6 

0.013 

28.6 

-  0 

.0002 

0.043 

100 

0.038 

85.0 

0.032 

71.0 

0.026 

57.0 

0.021 

43.8 

0.015 

31.3 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  ==  0.0012. 

B 


50 


PSYCHROMETRICAL    TABLES.  2 

Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —  Relative  Humidity  hi  Hundredths. 


t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

TYet- 

Mean 

t',  below  the  Freezing-Point  ,  the  Bulb  covered  with  a  Film  of  Ice. 

Bulb 

Vertical 

Thermo 

Difference 

o°.o 

0°.5 

1°.O 

1°.5 

2°.0 

2°.5 

meter 

of  Force 

t: 

of  Vapor 

Fahren- 

for each 

Rela- 

Rela- 

1  Rela- 

Rela- 

Rela- 

Rela- 

heit. 

0°.l. 

tive 

J    tive 

1      HVA 

tive 

tive 

i    tive 

Force  of 

Hu- 

Force of    nu- 

Force  ol 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of    jr.. 

Vapor. 

mid- 

Vapor. 

nud- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In 

0 

0.043 

100 

0.038 

85.0 

0.032 

70.7 

0.026 

57.0 

0.021 

43.8 

0.015 

31.3 

1 

0.0002 

0.045 

100 

0.040 

85.6 

0.034 

71.8 

0.028 

58.6 

0.023 

46.0 

0.017 

33.9 

2 

.0002 

0.047 

100 

0.042 

86.2 

0.036 

73.0 

0.031 

60.2 

0.025 

48.0 

0.019 

36.4 

3 

.0002 
.0002 

0.050 

100 

0.044 

86.7 

0.038 

74.0 

0.033 

61.8 

0.027 

50.0 

0.022 

38.8 

4 

0.052 

100 

0.046 

87.2 

0.041 

75.0 

0.035 

63.3 

0.030 

52.0 

0.024 

41.2 

.0002 

5 

0.055 

100 

0.049 

87.7 

0.043 

76.0 

0.038 

64.7 

0.032 

53.8 

0.026 

43.4 

6 

.0002 

0.057 

100 

0.051 

88.2 

0.046 

76.9 

0.040 

66.0 

0.034 

55.3 

0.029 

45.2 

7 

.0003 

0.059 

100 

0.054 

88.6 

0-048 

77.7 

0.043 

67.1 

0.037 

56.8 

0.031 

47.0 

8 

.0003 

0.062 

100 

0.057 

89.0 

0.051 

78.4 

0.045 

68.2 

0.040 

58.2 

0.034 

48.8 

9 

.0003 

0.065 

100 

0.059 

89.4 

0.054 

79.1 

0.048 

69.2 

0.043 

59.6 

0.037 

50.5 

.0003 

10 

0.068 

100 

0.062 

89.8 

0.057 

79.7 

0.051 

70.1 

0.046 

61.0 

0.040 

52.2 

11 

.0003 

0.071 

100 

0.066 

90.1 

0.061 

80.4 

0.054 

71.1 

0.049 

62.3 

0.043 

53.8 

12 

.0003 

0.075 

100 

0.069 

90.4 

0.063 

81.0 

0.05S 

72.1 

0.052 

63.5 

0.046 

55.3 

13 

.0003 

0.078 

100 

0.072 

90.7 

0.067 

81.6 

0.061 

73.0 

0.056 

64.8 

0.050 

56.8 

14 

.0004 

0.082 

100 

0.076 

91.0 

0.071 

82.3 

0.065 

73.9 

0.059 

65.9 

0.054 

58.2 

.0004 

15 

0.086 

100 

0.080 

91.3 

0.074 

82.9 

0.069 

74.8 

0.063 

67.1 

0.057 

59.7 

16 

.0004 

0.090 

100 

0.084 

91.6 

0.078 

83.4 

0.073 

75.7 

0.067 

68.2 

0.061 

61.0 

17 

.0004 

0.094 

100 

O.OS8 

91.9 

0.083 

84.0 

0.077 

76.5 

0.071 

69.2 

0.066 

62.3 

18 

.0004 

0.098 

100 

0.093 

92.1 

0.087 

84.5 

0.081 

77.2 

0.076 

70.2 

0.070 

63.5 

19 

.0005 

0.103 

100 

0.097 

92.4 

0.092 

85.0 

0.086 

78.0 

0.080 

71.2 

0.075 

64.7 

.0005 

20 

0.108 

100 

0.102 

92.6 

0.096 

85.5 

0.091 

78.7 

0.085 

72.1 

0.079 

65.8 

21 

.0005 

0.113 

100 

0.107 

92.9 

0.101 

86.0 

0.096 

79.4 

0.090 

73.0 

0.084 

66.9 

22 

.0005 

0.118 

100 

0.112 

93.1 

0.107 

86.4 

0.101 

80.0 

0.095 

73.8 

0.089 

68.0 

23 

.0005 

0.123 

100 

0.118 

93.3 

0.112 

86.8 

0.106 

80.7 

0.100 

74.6 

0.095 

68.9 

24 

.0006 

0.129 

100 

0.123 

93.6 

0.117 

87.2 

0.112 

81.2 

0.106 

75.4 

0.100 

69.9 

25 

.0006 

0.135 

100 

0.129 

93.8 

0.123 

87.6 

0.118 

81.8 

0.112 

76.1 

0.106 

70.7 

.0006 

26 

0.141 

100 

0.135 

94.0 

0.129 

88.0 

0.123 

82.4 

0.117 

76.8 

0.112 

71.6 

27 

.0006 

0.147 

100 

0.141 

94.1 

0.136 

88.3 

0.130 

82.9 

0.124 

77.5 

0.118 

72.5 

28 

.0006 

0.153 

100 

0.148* 

94.3 

0.142 

88.7 

0.136 

83.4 

0.130 

78.2 

0.125 

73.3 

29 

.0007 

0.160 

100 

0.154 

94.5 

0.149 

89.0 

0.143 

83.9 

0.137 

78.8 

0.131 

74.0 

30 

.0007 

0.167 

100 

0.161 

94.7 

0.155 

89.3 

0.150 

84.3 

0.144 

79.4 

0.138 

74.8 

31 

.0007 

0.174 

100 

0.168 

94.8 

0.162 

89.6 

0.157 

84.8 

0.151 

80.0 

0.145 

75.6 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0012. 

B 


51 


3  PSYCHROMETRICAL    TABLES. 

Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —  Relative  Humidity  in  Hundredths. 


t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

"Wet- 

Mean 

t',  below  the  Freezing-Point  ;  the  Bulb  covered  with  a  Film  of  Ice. 

Bulb 

Vertical 

Thermo 

Difference 

3°.O 

3°.«5 

4°.O 

4°»5 

5°.O 

5°«5 

meter 

of  Force 
of  "Vapor 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

0°-1« 

tive 

tive 

tive 

tive 

tive 

tive 

Force  of 

Hu- 

Force oi 

Hu- 

Force o 

Hu- 

Force o 

Hu- 

Force o 

Hu- 

Force of 

Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In 

Eng.  In 

Eng.  In 

Eng.  In 

Eng.  In 

Eng.  In. 

0 

0.0002 

0.010 

19.3 

0.004 

7.9 

1 

.0002 

0.012 

22.3 

0.006 

11.3 

2 

0.014 

25.3 

0.008 

14.7 

.0002 

3 

.0002 

0.016 

28.1 

0.010 

17.8 

4 

0.018 

30.8 

0.013 

20.9 

0.007 

11.4 

.0002 

5 

0.021 

33.4 

0.015 

23.8 

0.010 

14.6 

6 

.0002 

0.023 

35.6 

0.018 

26.3 

0.012 

17.5 

0.006 

9.0 

.0002 

7 

0.026 

37.7 

0.020 

28.8 

0.014 

20.2 

0.009 

12.0 

8 

.0003 

0.028 

39.8 

0.023 

31.2 

0.017 

22.9 

0.011 

15.0 

9 

.0003 

0.031 

41.8 

0.026 

33.5 

0.020 

25.5 

0.014 

17.9 

0.009 

10.6 

.0003 

10 

0.034 

43.8 

0.029 

35.7 

0.023 

28.0 

0.017 

20.6 

0.012 

13.6 

11 

.0003 

0.037 

45.7 

0.032 

37.9 

0.026 

30.4 

0.020 

23.3 

0.014 

16.4 

0.009 

9.9 

12 

.0003 

0.041 

47-5 

0.035 

40.0 

0.029 

32.7 

0.024 

25.8 

0.018 

19.2 

0.012 

12.9 

13 

.0003 

0.044 

49.2 

0.039 

42.0 

0.033 

35.0 

0.027 

28.3 

0.022 

21.9 

0.016 

15.8 

14 

.0004 

0.048 

50.9 

0.042 

43.9 

0.037 

37.1 

0.031 

30.7 

0.025 

24.5 

0.020 

18.5 

.0004 

15 

0.052 

52.5 

0.046 

45.7 

0.040 

39.2 

0.035 

32.9 

0.029 

26.9 

0.023 

21.2 

16 

.0004 

0.056 

54.1 

0.050 

47.5 

0.044 

41.2 

0.039 

35.1 

0.033 

29.3 

0.027 

23.7 

17 

.0004 

0.060 

55.6 

0.054 

49.2 

0.049 

43.1 

0.043 

37.2 

0.037 

31.6 

0.032 

26.2 

18 

.0004 

0.065 

57.0 

0.059 

50.9 

0.053 

44.9 

0.047 

39.2 

0.042 

33.7 

0.036 

28.5 

19 

.0004 

0.069 

58.4 

0.063 

52.5 

0.058 

46.7 

0.052 

41.2 

0.046 

35.8 

0.040 

30.7 

.0005 

20 

0.074 

59.8 

0.068 

54.0 

0.062 

48.3 

0.057 

43.0 

0.050 

37.8 

0.045 

32.9 

21 

.0005 

0.079 

61.0 

0.073 

55.4 

0.067 

50.0 

0.062 

44.7 

0.056 

39.7 

0.050 

34.9 

22 

.0005 

0.084 

62.2 

0.078 

56.8 

0.072 

51.5 

0.067 

46.4 

0.061 

41.5 

0.055 

36.8 

23 

.0005 

0.089 

63.4 

0.083 

58.1 

0.078 

52.9 

0.072 

48.0 

0.066 

43.3 

0.061 

38.6 

24 

.0006 

0.095 

64.4 

0.089 

59.3 

0.083 

54.3 

0.077 

49.6 

0.072 

44.9 

0.066 

40.5 

25 

.0006 

0.100 

65.5 

0.095 

60.5 

0.089 

55.6 

0.083 

51.0 

0.078 

46.5 

0.072 

42.2 

.0006 

26 

0.106 

66.5 

0.101 

61.7 

0.095 

56.9 

0.089 

52.4 

0.083 

48.0 

0.078 

43.9 

27 

.0000 

0.113 

67.5 

0.107 

62.8 

0.101 

58.2 

0.095 

53.8 

0.090 

49.6 

0.084 

45.5 

28 

.0006 

0.119 

68.5 

0.113 

63.9 

0.108 

59.4 

0.102 

55.2 

0.096 

51.0 

0.090 

47.0 

29 

.0007 

0.126 

69.4 

0.120 

64.9 

0.114 

60.6 

0.108 

56.4 

0.103 

52.4 

0.097 

48.5 

30 

.0007 

0.132 

70.3 

0.127 

65.9 

0.121 

G1.7 

0.115 

57.7 

0.109 

53.7 

0.104 

49.9 

31 

.0007 

0.139 

71.2 

0.134 

66.9 

0.128 

62.8 

0.122 

58.8 

0.116 

55.0 

0.111 

51.2 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0012. 

B 


52 


PSYCHROMETRICAL    TABLES. 
Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —Relative-Humidity  in  Hundredth)- 


t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

"Wof 

Mean 

t',  below  the  Freezing-Point  ;  the  Bulb  covered  with  a  Film  of  Ice. 

\y  ec- 
Bulb 

Vertical 

Thermo- 

Difference 

6°.O 

6°«5 

PJ>O«O 

<7°*5 

8°.O 

8°««5 

meter 

of  Force 

£J 

of  Vapor 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

o°.i. 

tive 

tive 

tive 

tive 

tive 

tive 

Force  of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of    nu_ 

force  of 

Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. |  mid. 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng  In. 

12 

0.0003 

0.007 

6.8 

13 

0.010 

9.9 

.0004 

14 

.0004 

0.014 

12.8 

0.008 

7.5 

15 

.0004 

0.018 

15.7 

0.012 

10.4 

0.006 

5.4 

16 

0.022 

18.4 

0.016 

13.3 

0.010 

8.4 

.0004 

* 

17 

0.026 

21.0 

0.020 

16.0 

0-015 

11.3 

0.009 

6.7 

.0004 

18 

0.030 

23.5 

0.025 

18.6 

0.019 

14.0 

0.013 

9.6 

0.008 

5.3 

.0005 

19 

0.035 

25.8 

0.029 

21.2 

0.023 

16.6 

0.018 

12.3 

0.012 

8.2 

0.006 

4.2 

.0005 

20 

0.040 

28.1 

0.034 

23.5 

0.028 

19.0 

0.022 

15.0 

0.017 

11.0 

0.011 

7.1 

.0005 

21 

0.044 

30.3 

0.039 

25.8 

0.033 

21.5 

0.027 

17.5 

0.022 

13.5 

0.016 

9.8 

.0005 

22 

0.050 

32.3 

0.044 

28.0 

0.038 

23.8 

0.032 

19.8 

0.027 

16.0 

0.021 

12.3 

23 

.0005 

0.055 

34.2 

0.049 

30.1 

0.043 

26.0 

0.038 

22.1 

0.032 

18.4 

0.026 

14.8 

24 

.0005 

0.060 

36.1 

0.055 

32.1 

0.049 

28.1 

0.043 

24.4 

0.038 

20.7 

0.032 

17.2 

25 

.0006 

0.066 

38.0 

0.060 

34.0 

0.055 

30.2 

0.049 

26.5 

0.043 

23.0 

0.038 

19.5 

26 

.0006 

0.072 

39.8 

0.066 

35.9 

0.061 

32.2 

0.055 

28.6 

0.049 

25.1 

0.043 

21.8 

.0006 

27 

0.078 

41.5 

0.073 

37.8 

0.067 

34.0 

0.061 

30.6 

0.055 

27.2 

0.050 

23.9 

28 

.0006 

0.085 

43.2 

0.079 

39.5 

0.073 

35.9 

0.067 

32.5 

0.062 

29.1 

0.056 

25.9 

29 

.0007 

0.091 

44.8 

0.085 

41.1 

0.080 

37.6 

0.074 

34.2 

0.068 

31.0 

0.063 

27.9 

30 

.0007 

0.098 

46.2 

0.092 

42.7 

0.086 

39.2 

0.081 

35.9 

0.075 

32.8 

0.069 

29.7 

31 

.0007 

0.105 

47.6 

0.099 

44.2 

0.093 

40-8 

0.088 

37.5 

0.082 

34.4 

0.076 

31.4 

9°.O 

9°.5 

10°.0 

10°.5 

110.0 

.10.5 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

20 

0.005 

3.4 

21 

0.0005 

0.010 

6.1 

0.005 

2.7 

22 

.0005 

0.015 

8.8 

0.010 

5.4 

0.004 

2.2 

23 

.0005 

0.021 

11.4 

0.015 

8.0 

0.009 

4.9 

24 

.0005 

0.026 

13.9 

0.020 

10.6 

0.015 

7.5 

0.009 

4.5 

25 

.0006 

0.032 

16.2 

0.026 

13.1 

0.020 

10.0 

0.015 

7.1 

0.009 

4.2 

.0006 

26 

0.038 

18.5 

0.032 

15.4 

0.026 

12.4 

0.021 

9.5 

0.015 

6.8 

0.009 

4.1 

27 

.0006 

0.044 

20.7 

0.038 

17.7 

0.032 

14.7 

0.027 

11.9 

0.021 

9.2 

0.015 

6.5 

28 

.0006 

0.050 

22.8 

0.045 

19.9 

0.039 

16.9 

0.033 

14.2 

0.027 

11.5 

0.022 

8.9 

29 

.0007 

0.057 

24.9 

0.051 

21.9 

0.045 

19.0 

0.040 

16.3 

0.034 

13.7 

0.028 

11.1 

30 

.0007 

0.064 

26.7 

0.058 

23.8 

0.052 

21.0 

0.046 

18.4 

0.041 

15.8 

0.035 

13.3 

31 

.0007 

0.071 

28.5 

0.065 

25.7 

0.059 

22.9 

0.053 

20.3 

0.048 

17.8 

0.042 

15.3 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0012. 

B 


53 


PSYCHROMETRICAL    TABLES. 
Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —  Relative  Humidity  in  Hundredths. 


t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Wet- 
Bulb 
Thermo- 

Mean 
Vertical 
Mfference 

oo.o 

O°.5 

lo.O 

lo.5 

20.0 

20.5 

meter 

of  Force 

Fahren- 

of Vapor 
for  each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

00.1. 

Force  of 

tive 
Hu- 

Force of 

tive 
Hu- 

Force of 

tive 
Hu- 

Force of 

tive 
Hu- 

Torce of 

tive 
Hu- 

Force of 

tive 
Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

32 

0.0007 

0.181 

100 

0.175 

94.5 

0.168 

89.3 

0.162 

84.1 

0.155 

79.2 

0.149 

74.4 

33 

0.188 

100 

0.182 

94.7 

0.175 

89.5 

0.169 

84.5 

0.162 

79.7 

0.156 

75.0 

34 

.0008 
.0008 

0.196 

100 

0.189 

94.8 

0.183 

89.8 

0.176 

84.9 

0.170 

80.2 

0.163 

75.6 

35 

.0008 

0.204 

100 

0.197 

94.9 

0.191 

90.0 

0.184 

85.3 

0.178 

80.7 

0.171 

76.2 

36 

0.212 

100 

0.205 

95.0 

0.199 

90.3 

0.192 

85.6 

0.186 

81.1 

0.179 

76.8 

.0009 

37 

.0009 

0.220 

100 

0.214 

95.2 

0.207 

90.5 

0.201 

86.0 

0.194 

81.6 

0.188 

77.3 

38 

0.229 

100 

0.223 

95.3 

0.216 

90.7 

0.210 

86.3 

0.203 

82.0 

0.196 

77.9 

39 

.0009 
.0009 

0.238 

100 

0.232 

95.4 

0.225 

91.0 

0.219 

86.6 

0.212 

82.4 

0.206 

78.4 

40 

0.248 

100 

0.241 

95.5 

0.235 

91.2 

0.228 

86.9 

0.221 

82.9 

0.215 

78.9 

41 

.0010 

0.257 

100 

0.251 

95.6 

0.244 

91.4 

0.238 

87.3 

0.231 

83.3 

0.224 

79.4 

.0010 

42 

0.267 

100 

0.260 

95.7 

0.254 

91.6 

0.247 

87.5 

0.241 

83.6 

0.234 

79.8 

43 

.0010 

0.278 

100 

0.271 

95.8 

0.264 

91.8 

0.258 

87.8 

0.251 

84.0 

0.245 

80.3 

44 

.0011 

0.288 

100 

0.282 

95.9 

0.275 

92.0 

0.268 

88.1 

0.262 

84.3 

0.255 

80.7 

45 

.0011 

0.299 

100 

0.293 

96.0 

0.286 

92.1 

0.280 

88.3 

0.273 

84.7 

0.266 

81.1 

46 

.0011 

0.311 

100 

0.304 

96.1 

0.297 

92.3 

0.291 

88.6 

0.284 

85.0 

0.278 

81.5 

.0012 

47 

0.323 

100 

0.316 

96.2 

0.310 

92.5 

0.303 

88.8 

0.297 

85.3 

0.290 

81.9 

48 

.0012 

0.335 

100 

0.329 

96.2 

0.322 

92.6 

0.315 

89.0 

0.309 

85.6 

0.302 

82.2 

49 

.0013 

0.348 

100 

0.341 

96.3 

0.335 

92.7 

0.328 

89.3 

0.321 

85.9 

0.315 

82.6 

50 

.0013 

0.361 

100 

0.354 

96.4 

0.348 

92.9 

0.341 

89.5 

0.334 

86.1 

0.328 

82.9 

•51 

.0013 

0.374 

100 

0.368 

96.5 

0.361 

93.0 

0.354 

89.7 

0.348 

86.4 

0.341 

83.2 

.0014 

52 

0.388 

100 

0.382 

96.5 

0.375 

93.2 

0.368 

89.9 

0.362 

86.7 

0.355 

83.6 

53 

.0014 

0.403 

100 

0.396 

96.6 

0.389 

93.3 

0.383 

90.1 

0.376 

86.9 

0.370 

83.9 

54 

.0015 

0.418 

100 

0.411 

96.7 

0.404 

93.4 

0.398 

90.2 

0.391 

87.2 

0.385 

84.2 

55 

.0015 

0.433 

100 

0.426 

96.7 

0.420 

93.5 

0.413 

90.4 

0.407 

87.4 

0.400 

84.4 

56 

.0016 

0.449 

100 

0.442 

96.8 

0.436 

93.6 

0.429 

90.6 

0.422 

87.6 

0.416 

84.7 

.0016 

57 

0.466 

100 

0.459 

96.8 

0.452 

93.7 

0.446 

90.7 

0.439 

87.8 

0.432 

85.0 

58 

.0017 

0.482 

100 

0.476 

96.9 

0.469 

93.9 

0.463 

90.9 

0.456 

88.0 

0.449 

85.2 

59 

.0017 

0.500 

100 

0.493 

96.9 

0.487 

94.0 

0.480 

91.0 

0.473 

88.2 

0.467 

85.5 

60 

.0018 

0.518 

100 

0.511 

97.0 

0.505 

94.1 

0.498 

91.2 

0.491 

88.4 

0.485 

85'.7 

61 

.0019 

0.537 

100 

0.530 

97.0 

0.523 

94.2 

0.517 

91.3 

0.510 

88.6 

0.503 

85.9 

.0019 

62 

0.556 

100 

0.549 

97.1 

0.542 

94.2 

0.536 

91.5 

0.529 

88.8 

0.522 

86.2 

63 

.0020 

0.576 

100 

0.569 

97.1 

0.562 

94.3 

0.556 

91.6 

0.549 

89.0 

0.542 

86.4 

64 

.0020 

0.596 

100 

0.589 

97.2 

0.583 

94.4 

0.576 

91.7 

0.569 

89.1 

0.563 

86.6 

65 

.0021* 

0.617 

100 

0.611 

97.2 

0.604 

94.5 

0.597 

91.9 

0.591 

89.3 

0.584 

86-8 

66 

.0022 

0.639 

100 

0.633 

97.3 

0.626 

94.6 

0.619 

92.0 

0.612 

89.5 

0.606 

87.0 

67 

.0023 

0.662 

100 

0.655 

97.3 

0.648 

94.7 

0.642 

92.1 

0.635 

89.6 

0-628 

87.2 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  Oo.l  =  0.0013. 

B 


54 


PSYCHROMETRICAL    TABLES. 
Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —  Relative  Humidity  in  Hundredths. 


Alean 

t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Bulb 
Thermo- 

Vertical 
Difference 

o°.o 

00.5 

1°0 

1°5 

2°.O 

2°  5 

meter 

of  Force 

t' 

of  Vapor 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

O^.l* 

tive 

tive 

tive 

tive 

tive 

tive 

Force  of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In 

Eng.  In 

Eng  In 

68 

0.0023 

0.685 

100 

0.678 

97.3 

0.671 

94.7 

0.665 

92.2 

0.658 

89.8 

0.651 

87.3 

69 

.0024 

0.708 

100 

0.702 

97.4 

0.695 

94.8 

0.688 

92.3 

0.682 

89.9 

0.675 

87.5 

70 

.0025 

0.733 

100 

0.726 

97.4 

0.720 

94.9 

0.713 

92.4 

0.706 

90.0 

0.699 

87.7 

71 

.0026 

0.758 

100 

0.752 

97.5 

0.745 

95.0 

0.738 

92.5 

0.731 

90.2 

0.725 

87.9 

72 

0.784 

100 

0.778 

97.5 

0.771 

95.0 

0.764 

92.7 

0.757 

90.3 

0.751 

88.0 

.0027 

73 

.0028 

0.811 

100 

0.805 

97.5 

0.798 

95.1 

0.791 

92.7 

0.784 

90.4 

0.778 

88.2 

74 

.0028 

0.839 

100 

0.832 

97.6 

0.826 

95.2 

0.819 

92.8 

0.812 

90.6 

0.805 

88.3 

75 

.0029 

0.868 

100 

0.861 

97.6 

0.854 

95.2 

0.847 

92.9 

0.841 

90.7 

0.834 

88.5 

76 

.0030 

0.897 

100 

0.890 

97.6 

0.883 

95.3 

0.877 

93.0 

0.870 

90.8 

0.863 

88.6 

77 

0.927 

100 

0.920 

97.7 

0.914 

95.4 

0.907 

93.1 

0.900 

90.9 

0.893 

88.8 

.0031 

78 

.0032 

0.958 

100 

0.951 

97.7 

0.945 

95.4 

0.938 

93.2 

0.931 

91.0 

0.924 

88.9 

79 

.0033 

0.990 

100 

0.983 

97.7 

0.977 

95.5 

0.970 

93.3 

0.963 

91.1 

0.956 

89.0 

80 

.0034 

1.023 

100 

1.016 

97.7 

1.010 

95.5 

1.003 

93.4 

0.996 

91.2 

0.989 

89.2 

81 

.0035 

1.057 

100 

1.050 

97.8 

1.044 

95.6 

1.037 

93.4 

1.030 

91.3 

1.023 

89.3 

82 

1.092 

100 

1.085 

97.8 

1.079 

95.6 

1.072 

93.5 

1.065 

91.4 

1.058 

89.4 

.0036 

83 

.0037 

1.128 

100 

1.121 

97.8 

1.115 

95.7 

1.108 

93.6 

1.101 

91.5 

1.094 

89.5 

84 

1.165 

100 

1.158 

97.8 

1.152 

95.7 

1.145 

93.6 

1.138 

91.6 

1.131 

89.6 

.0038 

85 

1.203 

100 

1.196 

97.9 

1.189 

95.8 

1.183 

93.7 

1.176 

91.7 

1.169 

89.7 

.0039 

86 

1.242 

100 

1.235 

97.9 

1.228 

95.8 

1.222 

93.8 

1.215 

91.8 

1.208 

89.8 

87 

.0040 

1.282 

100 

1.275 

97.9 

1.268 

95.9 

1.263 

93.8 

1.256 

91.9 

1.249 

90.0 

.0041 

88 

1.323 

100 

1.317 

97.9 

1.310 

95.9 

1.303 

93.9 

1.296 

92.0 

1.289 

90.1 

89 

.0042 

1.366 

100 

1.359 

97.9 

1.352 

95.9 

1.345 

94.0 

1.339 

92.0 

1.332 

90.2 

90 

.0044 

1.410 

100 

1.403 

98.0 

1.396 

96.0 

1.389 

94.0 

1.382 

92.1 

1.375 

90.3 

91 

.0045 

1.455 

100 

1.448 

98.0 

1.441 

96.0 

1.434 

94.1 

1.427 

92.2 

1.420 

90,3 

92 

.0046 

1.501 

100 

1.494 

98.0 

1.487 

96.1 

1.480 

94.1 

1.473 

92.3 

1.466 

90.4 

.0048 

93 

1.548 

100 

1.541 

98.0 

1.535 

96.1 

1.528 

94.2 

1.521 

92.4 

1.514 

90.5 

94 

.0049 

1.597 

100 

1.590 

98.1 

1.583 

96.1 

1.576 

94.3 

1.569 

92.4 

1.562 

90.6 

95 

.0050 

1.647 

100 

1.640 

98.1 

1.633 

96.2 

1.626 

94.3 

1.619 

92.5 

1.612 

90.7 

96 

.0051 

1.698 

100 

1.691 

98.1 

1.684 

96.2 

1.677 

94.4 

1.670 

92.6 

1.664 

90.8 

97 

.0053 

1.751 

100 

1.744 

98.1 

1.739 

96.2 

1.730 

94.4 

1.723 

92.6 

1.716 

90.9 

98 

.0054 

1.805 

100 

1.798 

98.1 

1.791 

96.3 

1.784 

94.5 

1.777 

92.7 

1.770 

90.9 

.0056 

99 

1.861 

100 

1.854 

98.1 

1.847 

96.3 

1.840 

94.5 

1.833 

92.8 

1.826 

91.0 

100 

.0057 

1.918 

100 

1.911 

98.2 

1.904 

96.3 

1.897 

94.6 

1.890 

92.8 

1.883 

91.1 

101 

.0059 

1.977 

100 

1.970 

98.2 

1.963 

96.4 

1.956 

94.6 

1.949 

92.9 

1.942 

91.2 

102 

.0060 

2.037 

100 

2.030 

98.2 

2.023 

96.4 

2.016 

94.7 

2.009 

92.9 

2.002 

91.2 

103 

.0062 

2.098 

100 

2.092 

98.2 

2.085 

96.4 

2.078 

94.7 

2.071 

93.0 

2.064 

91.3 

104 

.0063 

2.162 

100 

2.155 

98.2 

2.148 

96-5 

2.141 

94.7 

2.134    93.1 

2.127 

91.4 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


55 


7  PSYCHROMETRICAL    TABLES. 

Temperature,  Fahrenheit.  —  Force  of  Tapor  in  English  Inches.  —  Relative  Humidity  in  Hundredths. 


TTr«f 

"MVmv* 

t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

wet- 
Bulb 
Thermo- 

JML GcUl 

Vertical 
Difference 

s°.o 

3°.5 

4°.0 

4°.5 

5°.0 

5°.5 

meter 
gi 

of  Force 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela 

Rela- 

heit. 

0°.l. 

tive 

tive 

tive 

tive 

tive 

tive 

?orce  of 
Vapor. 

Hu- 
mid- 

Force of 

Vapor. 

Hu- 
mid- 

Force  of 
Vapor. 

Hu- 
mid- 

Force of 
Vapor. 

Hu- 
mid- 

Force of 

Vapor. 

Hu- 
mid- 

Force  of 
Vapor. 

Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

32 

0.142 

69.8 

0.136 

65.3 

0.129 

61.0 

0.123 

56.8 

0.116 

52.7 

0.110 

48.8 

0.0007 

33 

0.149 

70.5 

0.143 

66.1 

0.136 

61.9 

0.130 

57.7 

0.123 

53.7 

0.117 

50.0 

.0007 

34 

0.157 

71.2 

0.150 

66.9 

0.144 

62.8 

0.137 

58.6 

0.131 

54.7 

0.124 

51.2 

.0008 

35 

.0008 

0.165 

71.9 

0.158 

67.7 

0.152 

63.6 

0.145 

59.5 

0.139 

55.7 

0.132 

52.3 

36 

0.173 

72.6 

0.166 

68.5 

0.160 

64.5 

0.153 

60.5 

0.147 

56.7 

0.140 

53.4 

.0008 

37 

0.181 

73.2 

0.175 

69.2 

0.168 

65.3 

0.162 

61.4 

0.155 

57.7 

0.149 

54.5 

.0009 

38 

.0009 

0.190 

73.8 

0.183 

69.9 

0.177 

66.1 

0.170 

62.3 

0.164 

58.7 

0.157 

55.5 

39 

0.199 

74.4 

0.192 

70.6 

0.186 

66.9 

0.179 

63.2 

0.173 

59.7 

0.166 

56.5 

.0010 

40 

0.208 

75.0 

0.202 

71.3 

0.195 

67.7 

0.189 

64.1 

0.182 

60.7 

0.176 

57.5 

.0010 

41 

0.218 

75.6 

0.211 

72.0 

0.205 

68.4 

0.198 

65.0 

0.192 

61.7 

0.185 

58.5 

.0010 

42 

0.228 

76.2 

0.221 

72.6 

0.215 

69.1 

0.208 

65.7 

0.202 

62.4 

0.195 

59.4 

43 

.0010 

0.238 

76.7 

0.232 

73.2 

0.225 

69.8 

0.219 

66.3 

0.212 

63.1 

0.205 

60.2 

.0011 

44 

0.249 

77.2 

0.242 

73.7 

0.236 

70.4 

0.229 

67.0 

0.223 

63.8 

0.216 

61.1 

45 

.0011 

0.260 

77.7 

0.253 

74.3 

0.247 

71.0 

0.240 

67.6 

0.234 

64.6 

0.227 

61.8 

.001  1 

46 

0.271 

78.1 

0.265 

74.8 

0.258 

71.6 

0.252 

68.3 

0.245 

65.3 

0.238 

62.6 

.0012 

47 

0.283 

78.6 

0.277 

75.3 

0.270 

72.2 

0.264 

68.9 

0.257 

66.0 

0.250 

63.3 

48 

.0012 

0.296 

79.0 

0.289 

75.8 

0.282 

72.7 

0.276 

69.6 

0.269 

66.7 

0.263 

64.0 

49 

.0013 

0.308 

79.4 

0.302 

76.3 

0.295 

73.3 

0.288 

70.2 

0.2S2 

67.4 

0.275 

64.7 

50 

.0013 

0.321 

79.8 

0.315 

76.7 

0.308 

73.8 

0.301 

70.9 

0.295 

68.1 

0.288 

65.4 

51 

.0013 

0.335 

80.2 

0.328 

77.2 

0.321 

74.3 

0.315 

71.4 

0.308 

68.7 

0.302 

66.0 

.0014 

52 

0.349 

80.5 

0.342 

77.6 

0.335 

74.7 

0.329 

71.9 

0.322 

69.2 

0.315 

66.6 

53 

.0014 

0.363 

80.9 

0.356 

78.0 

0.350 

75.2 

0.343 

72.5 

0.336 

69.8 

0.330 

67.2 

54 

.0015 

0.378 

81.2 

0.371 

78.4 

0.365 

75.6 

0.358 

72.9 

0.351 

70.3 

0.345 

67.8 

55 

.0015 

0.393 

81.6 

0.387 

78.8 

0.380 

76.1 

0.373 

73.4 

0.367 

70.8 

0.360 

68.3 

56 

.0016 

0.409 

81.9 

0.403 

79.1 

0.396 

76.5 

0.389 

73.9 

0.383 

71.3 

0.376 

68.9 

.0016 

57 

0.426 

82.2 

0.419 

79.5 

0.412 

76.9 

0.406 

74.3 

0.399 

71.8 

0.392 

69.4 

58 

.0017 

0.443 

82.5 

0.436 

79.8 

0.429 

77.2 

0.423 

74.8 

0.416 

72.3 

0.409 

69.9 

59 

.0017 

0.460 

82.8 

0.453 

80.2 

0.447 

77.6 

0.440 

75.1 

0.433 

72.7 

0.427 

70.3 

60 

.0018 

0.478 

83.1 

0.471 

80.5 

0.465 

78.0 

0.458 

75.5 

0.451 

73.1 

0.445 

70.8 

61 

.0019 

0.497 

83.3 

0.490 

80.8 

0.483 

78.3 

0.477 

75.9 

0.470 

73.5 

0.463 

71.3 

.0019 

62 

0.516 

83.6 

0.509 

81.1 

0.502 

78.6 

0.496 

76.3 

0.489 

74.0 

0.482 

71.7 

63 

.0020 

0.536 

83.8 

0.529 

81.4 

0.522 

79.0 

0.516 

76.6 

0.509 

74.3 

0.502 

72.1 

64 

.0020 

0.556 

84.1 

0.549 

81.7 

0.543 

79.3 

0.536 

77.0 

0.529 

74.7 

0.523 

72.5 

65 

.0021 

0.577 

84.3 

0.570 

81.9 

0.564 

79.6 

0.557 

77.3 

0.550 

75.1 

0.544 

72.9 

66 

.0022 

0.599 

84.6 

0.592 

82.2 

0.586 

79.9 

0.579 

77.6 

0.572 

75.4 

0.566 

73.3 

67 

.0023 

0.622 

84.8 

0.615 

82.4 

0.608 

80.2 

0.601 

78.0 

0.595 

75.8 

0.588 

mi 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


56 


PSYCHROMETRICAL    TABLES.  8 

Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —  Relative  Humidity  in  Hundredths. 


t  —  t',  or  Difference  of  TVet  and  Dry  Bulb  Thermometers. 

Bulb 
Thermo 

Vertical 
Differenc 

3°.O 

3°5 

i°.O 

4°»5 

5°0 

5°.  5 

meter 

•*f 

of  Force 
of  Vapoi 

Fahren 

for  each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit 

°°-L' 

Force  of 

tive 
Hu- 

Force of 

tive 
Hu- 

tive 
Force  of    Hu- 

Force  of 

tive 
Hu- 

Force of 

tive 
Hu- 

Force of 

tive 
Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor.    mid. 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

i    ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In 

Eng.  In. 

68 

0.644 

85.0 

0.638 

82.7 

0.631 

80.4 

0.624 

78.3 

0.618 

76.1 

0.611 

74.0 

0.0024 

69 

0.668 

85.2 

0.661 

82.9 

0.655 

80.7 

0.648 

78.6 

0.641 

76.4 

0.635 

74.4 

.0024 

70 

0.693 

85.4 

0.686 

83.2 

0.679 

81.0 

0.672 

78.8 

0.666 

76.8 

0.659 

74.7 

.0025 

71 

.0026 

0.718 

85.6 

0.711 

83.4 

0.704 

81.2 

0.698 

79.1 

0.691 

77.1 

0.684 

75.1 

72 

0.744 

85.8 

0.737 

83.6 

0.731 

81.5 

0.724 

79.4 

0.718 

77.4 

0.710 

75.4 

.0027 

73 

0.771 

86.0 

0.764 

83.8 

0.757 

81.7 

0.751 

79.7 

0.744 

77.6 

0.737 

75.7 

.0028 

74 

0.799 

86.2 

.0.792 

84.0 

0.785 

81.9 

0.778 

.79.9 

0.772 

77.9 

0.765 

76.0 

.0023 

75 

0.827 

86.3 

0.820 

84.2 

0.814 

82.2 

0.807 

80.2 

0.800 

78.2 

0.793 

76.3 

76 

.0029 

0.856 

86.5 

0.850 

84.4 

0.843 

82.4 

0.836 

80.4 

0.829 

78.4 

0.823 

76.6 

.0030 

77 

0.887 

86.7 

0.880 

84.6 

0.873 

82.6 

0.866 

80.6 

0.860 

78.7 

0.853 

76.8 

.0031 

78 

0.918 

86.8 

0.911 

84.8 

0.904 

82.8 

0.897 

80.8 

0.890 

78.9 

0.884 

77.1 

79 

.0032 

0.949 

87.0 

0.943 

85.0 

0.936 

83.0 

0.929 

81.1 

0.922 

79.2 

0.916 

77.4 

.0033 

80 

0.982 

87.1 

0.976 

85.1 

0.969 

83.2 

0.962 

81.3 

0.955 

79.4 

0.949 

77.6 

81 

.0034 

1.016 

87.3 

1.010 

85.3 

1.003 

83.4 

0.996 

81.5 

0.989 

79.7 

0.982 

77.9 

82 

.0035 

1.051 

87.4 

1.045 

85.5 

1.038 

83.6 

1.031 

81.7 

1.024 

79.9 

1.017 

78.1 

.0036 

83 

1.087 

87.5 

l.OSO 

85.6 

1.074 

83.7 

1.067 

81.9 

1.060 

80.1 

1.053 

78.3 

84 

.0037 

1.124 

87.7 

1.117 

85.8 

1.111 

83.9 

1.104 

82.1 

1.096 

80.3 

1.090 

78.5 

85 

.0033 

1.162 

87.8 

1.155 

85.9 

1.148 

84.1 

1.142 

82.3 

1.135 

80.5 

1.128 

78.8 

86 

.0039 

1.201 

87.9 

1.194 

86.1 

1.187 

84.2 

1.181 

82.4 

1.174 

80.7 

1.167 

79.0 

87 

.0040 

1.242 

88.1 

1.235 

86.2 

1.228 

84.4 

1.222 

82.6 

1.215 

80.9 

1.208 

79.2 

.0041 

88 

1.282 

88.2 

1.276 

86.3 

1.269 

84.6 

1.262 

82.8 

1.255 

81.1 

1.248 

79.4 

89 

.0042 

1.325 

88.3 

1.318 

86.5 

1.311 

84.7 

1.304 

83.0 

1.297 

81.3 

1.291 

79.6 

90 

.0044 

1.369 

88.4 

1.362 

86.6 

1.355 

84.9 

1.348 

83.1 

1.341 

81.4 

1.334 

79.8 

91 

.0045 

1.413 

88.5 

1.407 

86.7 

1.400 

85.0 

1.393 

83.3 

1.386 

81.6 

1.379 

80.0 

92 

.0046 

1.460 

88.6 

1.453 

86.9 

1.446 

85.1 

1.439 

83.4 

1.432 

81.8 

1.425 

80.2 

.0047 

93 

1.507 

88.7 

1.500 

87.0 

1.493 

85.3 

1.486 

83.6 

1.480 

82.0 

1.473 

80.3 

94 

.0049 

1.556 

88.8 

1.549 

87.1 

1.542 

85.4 

1.535 

83.8 

1.528 

82.1 

1.521 

80.5 

95 

.0050 

1.606 

88.9 

1.599 

87.2 

1.592 

85.5 

1.585 

83.9 

1.578 

82.3 

1.571 

80.7 

96 

.0051 

1.657 

89.0 

1.650 

87.3 

1.643 

85.7 

1.636 

84.0 

1.629 

82.4 

1.622 

80.9 

97 

.0052 

1.709 

89.1 

1.702 

87.5 

1.696 

85.8 

1.688 

84.2 

1.682 

82.6 

1.675 

81.0 

98 

.0054 

1.764 

89.2 

1.757 

87.6 

1.750 

85.9 

1.743 

84.3 

1.736 

82.7 

1.729 

81.2 

.0055 

99 

1.819 

89.3 

1.812 

87.7 

1.805 

86.0 

1.798 

84.4 

1.792 

82.9 

1.785 

81.3 

100 

.0057 

1.876 

89.4 

1.869 

87.8 

1.863 

86.2 

1.856 

84.6 

1.849 

83.0 

1.842 

81.5 

101 

.0058 

1.935 

89.5 

1.928 

87.9 

1.921 

86.3 

1.914 

84.7 

1.907 

83.2 

1.900 

81.6 

102 

.0060 

1.995 

89.6 

1.988 

88.0 

1.981 

86.4 

1.974 

84.8 

1.967 

83.3 

1.961 

81.8 

103 

.0062 

2.057 

89.7 

2.050 

88.1 

2.043 

86.5 

2.036 

84.9 

2.029 

83.4 

2.022 

81.9 

104 

.0063 

2.120 

89.8 

2.113 

88.2 

2.106 

86.6 

2.099 

85.1 

2.092 

83.5 

2.085 

82.1 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


57 


9  PSYCHROMETRICAL    TABLES. 

Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —  Relative  Humidity  in  Hundredths 


Wet- 

t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Bulb 
Thermo- 
meter 

f 

Vertical 
Difference 
of  Force 
of  Vapor 

6°.0 

6°.5 

7°.0 

7°.5 

8°.0 

8°.5 

Fahren- 

for each 

Rela- 

Rela 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

0°.l. 

tive 

tive 

tive 

tive 

tive 

tivO 

Force  of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

32 

0.103 

45.0 

0.097 

41.4 

0.090 

37.9 

0.084 

34.5 

0.077 

31.2 

0.071 

28.0 

33 

0.0007 

0.110 

46.3 

0.104 

42.7 

0.097 

39.3 

0.091 

36.0 

0.084 

32.8 

0.078 

29.6 

.0007 

34 

0.118 

47.6 

0.111 

44.1 

0.105 

40.7 

0.098 

37.4 

0.092 

34.3 

0.085 

31.2 

35 

.0008 

0.126 

48.8 

0.119 

45.3 

0.113 

42.0 

0.106 

38.8 

0.100 

35.7 

0.093 

32.8 

.0008 

36 

0.134 

50.0 

0.127 

46.6 

0.121 

43.3 

0.114 

40.2 

0.108 

37.2 

0.101 

34.3 

.0009 

87 

0.142 

51.1 

0.136 

47.8 

0.129 

44.6 

0.123 

41.6 

0.116 

38.6 

0.109 

35.7 

38 

.0009 

0.151 

52.2 

0.144 

49.0 

0.138 

45.9 

0.131 

42,9 

0.125 

40.0 

0.118 

37.2 

39 

.0009 

0.160 

53.3 

0.153 

50.1 

0.147 

47.1 

0.140 

44.1 

0.134 

41.3 

0.127 

38.5 

40 

.0009 

0.169 

54.3 

0.163 

51.3 

0.156 

48.3 

0.149 

45.4 

0.143 

42.6 

0.136 

39.9 

41 

.0010 

0.179 

55.4 

0.172 

52.3 

0.166 

49.4 

0.159 

46.6 

0.153 

43.9 

0.146 

41.2 

.0010 

42 

0.189 

56.3 

0.182 

53.4 

0.175 

50.5 

0.169 

47.7 

0.162 

45.0 

0.156 

42.4 

43 

.0010 

0.199 

57.2 

0.192 

54.3 

0.186 

51.5 

0.179 

48.8 

0.173 

46.1 

0.166 

43.6 

44 

.0011 

0.209 

58.1 

0.203 

55.3 

0.196 

52.5 

0.190 

49.8 

0.183 

47.2 

0.177 

44.7 

45 

.0011 

0.220 

59.0 

0.214 

56.2 

0.207 

53.5 

0.201 

50.8 

0.194 

48.3 

0.188 

45.8 

46 

.0011 

0.232 

59.8 

0.225 

57.0 

0.219 

54.4 

0.212 

51.8 

0.206 

49.3 

0.198 

46.9 

.0012 

47 

0.244 

60.6 

0.237 

57.9 

0.231 

55.2 

0.224 

52.7 

0.217 

50.2 

0.211 

47.9 

48 

.0012 

0.256 

61.3 

0.249 

58.7 

0.243 

56.1 

0.236 

53.6 

0.230 

51.2 

0.223 

48.8 

49 

.0013 

0.269 

62.0 

0.262 

59.4 

0.255 

56.9 

0.249 

54.5 

0.242 

52.1 

0.236 

49.7 

50 

.0013 

0.282 

62.7 

0.275 

60.2 

0.268 

57.7 

0.262 

55.3 

0.255 

52.9 

0.249 

50.6 

51 

.0013 

0.295 

63.4 

0.288 

60.9 

0.282 

58.4 

0.275 

56.1 

0.269 

53.7 

0.262 

51.5 

.0014 

52 

0.309 

64.1 

0.302 

61.6 

0.296 

59.2 

0.289 

56.8 

0.282 

54.6 

0.276 

52.3 

53 

.0014 

0.323 

64.7 

0.317 

62.3 

0.310 

59.9 

0.303 

57.6 

0.297 

55.3 

0.290 

53.2 

54 

.0015 

0.338 

65.3 

0-332 

62.9 

0.325 

60.6 

0.318 

58.3 

0.312 

56.1 

0.305 

53.9 

55 

.0015 

0.354 

65.9 

0.347 

63.5 

0.340 

61.2 

0.334 

59.0 

0.327 

56.8 

0.320 

54.9 

56 

.0016 

0.369 

66.5 

0.363 

64.1 

0.356 

61.9 

0.349 

59.7 

0.343 

57.5 

0.336 

55.4 

.0017 

57 

0.386 

67.0 

0.379 

64.7 

0.373 

62.5 

0.366 

60.3 

0.359 

58.2 

0.353 

56.1 

58 

.0017 

0.403 

67.5 

0.396 

65.3 

0.389 

63.1 

0.383 

60.9 

0.376 

58.8 

0.369 

56.8 

59 

.0017 

0.420 

68.0 

0.413 

65.8 

0.407 

63.6 

0.400 

61.5 

0.393 

59.5 

0.387 

57.5 

60 

.0018 

0.438 

68.5 

0.431 

66.3 

0.425 

64.2 

0.418 

62.1 

0.411 

60.1 

0.405 

58.1 

61 

.0018 

0.457 

69.0 

0.450 

66.9 

0.443 

64.7 

0.436 

62.7 

0.430 

60.7 

0.423 

58.7 

.0019 

62 

0.476 

69.5 

0.469 

67.4 

0.462 

65.3 

0.456 

63.2 

0.449 

61.3 

0.442 

59.3 

63 

.0020 

0.495 

70.0 

0.489 

67.8 

0.482 

65.8 

0.475 

63.8 

0.469 

61.8 

0.462 

59.9 

64 

.00-21 

0.516 

70.4 

0.509 

68.3 

0.503 

66.3 

0.496 

64.3 

0.489 

62.4 

0.483 

60.5 

65 

.0021 

0.537 

70.8 

0.530 

68.8 

0.524 

66.8 

0.517 

64.8 

0.510 

62.9 

0.504 

61.0 

66 

.005*2 

0.559 

71.2 

0.552 

69.2 

0.545 

67.2 

0.539 

65.3 

0.532 

63.4 

0.525 

61.6 

67 

.0023 

0.581 

71.6 

0.575 

69.6 

0.568 

67.7 

0.561 

65.7 

0.554 

63.9 

0.549 

62.1 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


58 


PSYCHROMETRICAL    TABLES.  10 

Temperature,  Fahrenheit.  — Force  of  Vapor  in  English  Inches  — Relative  Humidity  in  Hundredths. 


-Trr-i. 

\T*»aw 

t  —  t:,  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

\?  Ct- 

Bulb 
Thermo- 

iHGcin. 

Vertical 
Difference 

6°.0 

6°.5 

T°.0 

7°.5 

8°.O 

8°.5 

meter 

£j 

of  Force 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit, 

0°.l. 

tive 

tive 

tive 

tive 

tive 

tive 

Force  of    nn- 

Force  of 

Hu- 

Force of 

Hu- 

Force o1 

Hu- 

Force ofj    HU- 

Force  of    HU- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 1  mid. 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity- 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In 

Eng.  In. 

63 

0.0024 

0.604 

72.0 

0.597 

70.0 

0.591 

68.1 

0.584 

66.2 

0.577 

64.4 

0.571 

62.6 

-69 

.0024 

0.628 

72.4 

0.621 

70.4 

0.614 

68.5 

0.608 

66.6 

0.601 

64.8 

0.594 

63.0 

70 

.0025 

0.652 

72.7 

0.646 

70.8 

0.639 

68.9 

0.632 

67.1 

0.625 

65.3 

0.619 

63.5 

71 

.0026 

0.678 

73.1 

0.671 

71.2 

0.664 

69.3 

0.657 

67.5 

0.651 

65.7 

0.644 

64.0 

72 

0.704 

73.4 

0.697 

71.5 

0.690 

69.7 

0.683 

67.9 

0.677 

66.1 

0.670 

64.4 

.0027 

73 

.0028 

0.730 

73.8 

0.724 

71.9 

0.717 

70.1 

0.710 

68.3 

0.703 

66.5 

0.697 

64.8 

74 

.0029 

0.758 

74.1 

0.751 

72.2 

0.745 

70.4 

0.738 

68.7 

0.731 

66.9 

0.724 

65.3 

75 

.0030 

0.787 

74.4 

0.780 

72.6 

0.773 

70.8 

0.766 

69.0 

0.760 

67.3 

0.753 

65.7 

76 

.0030 

0.816 

74.7 

0.809 

72.9 

0.802 

71.1 

0.796 

69.4 

0.789 

67.7 

0.782 

66.1 

77 

0.846 

75.0 

0.839 

73.2 

0.832 

71.4 

0.826 

69.7 

0.819 

68.1 

0.812 

66.4 

.0031 

78 

.0032 

0.877 

75.3 

0.870 

73.5 

0.863 

71.8 

0.857 

70.1 

0.850 

68.4 

0.843 

66.8 

79 

.0033 

0.909 

75.6 

0.902 

73.8 

0.895 

72.1 

0.888 

70.4 

0.882 

68.8 

0.875 

67.2 

80 

.0034 

0.942 

75.8 

0.935 

74.1 

0.928 

72.4 

0.921 

70.7 

0.915 

69.1 

0.908 

67.5 

81 

.0035 

0.976 

76.1 

0.969 

74.4 

0.962 

72.7 

0.955 

71.0 

0.948 

69.4 

0.942 

67.9 

82 

1.011 

76.4 

1.004 

74.6 

0.997 

73.0 

0.990 

71.3 

0.983 

69.8 

0.977 

68.2 

.0036 

83 

1.046 

76.6 

1.040 

74.9 

1.033 

73.3 

1.026 

71.6 

1.019 

70.1 

1.012 

68.5 

84 

.0037 
.0038 

1.083 

76.8 

1.077 

75.2 

1.070 

73.5 

1.063 

71.9 

1.056 

70.4 

1.049 

68.8 

85 

1.121 

77.1 

1.114 

75.4 

1.108 

73.8 

1.101 

72.2 

1.094 

70.7 

1.087 

69.1 

.0038 

86 

.0039 

1.160 

77.3 

1.153 

75.7 

1.147 

74.1 

1.140 

72.5 

1.133 

70.9 

1.126 

69.4 

87 

1.201 

77.5 

1.194 

75.9 

1.187 

74.3 

1.181 

72.7 

1.174 

71.2 

1.167 

69.7 

.0040 

88 

1.241 

77.7 

1.235 

76.1 

1.228 

74.6 

1.221 

73.0 

1.214 

71.5 

1.207 

70.0 

89 

.0042 

1.284 

78.0 

1.277 

76.4 

1.270 

74.8 

1.263 

73.3 

1.256 

71.8 

1.250 

70.3 

90 

.0044 

1.327 

78.2 

1.321 

76.6 

1.314 

75.0 

1.307 

73.5 

1.300 

72.0 

1.293 

70.6 

91 

.0045 

1.372 

78.4 

1.365 

76.8 

1.359 

75.3 

1.352 

73.7 

1.345 

72.3 

1.338 

70.8 

92 

.0046 

1.418 

78.6 

1.412 

77.0 

1.405 

75-5 

1.398 

74.0 

1.391 

72.5 

1.384 

71.1 

.0047 

93 

1.466 

78.8 

1.459 

77.2 

1.452 

75.7 

1.445 

74.2 

1.438 

72.8 

1.431 

71.3 

94 

.0049 

1.514 

79.0 

1.507 

77.4 

1.501 

75.9 

1.494 

74.4 

1.487 

73.0 

1.480 

71.6 

95 

.0050 

1.564 

79.1 

1.557 

77.6 

1.550 

76.1 

1.544 

74.7 

1.537 

73.2 

1.530 

71.8 

96 

.0051 

1.615 

79.3 

1.608 

77.8 

1.602 

76.3 

1.595 

74.9 

1.588 

73.4 

1.581 

72.1 

97 

.0052 

1.668 

79.5 

1.661 

78.0 

1.654 

76.5 

1.647 

75.1 

1.640 

73.7 

1.633 

72.3 

98 

.0054 

1.722 

79.7 

1.715 

78.2 

1.708 

76.7 

1.701 

75.3 

1.694    73.9 

1.688    72.5 

.0056 

99 

1.778 

79.8 

1.771 

78.4 

1.764 

76.9 

1.757 

75.5 

1.750    74.1 

1.743 

72.7 

100 

.0057 

1.835 

80.0 

1.828 

78.5 

1.821 

77.1 

1.814 

75.7 

1.807    74.3 

1.800 

72.9 

101 

.0059 

1.893 

80.2 

1.887 

78.7 

1.880 

77.3 

1.873 

75.9 

1.866 

74.5 

1.859 

73.2 

102 

.0060 

1.954 

80.3 

1.947 

78.9 

1.940 

77.4 

1.933 

76.1 

1.926 

74.7 

1.919 

73.4 

103 

.0061 

2.015 

80.5 

2.008 

79.0 

2.001 

77.6 

1.994 

76.2 

1.987 

74.9 

1.980 

73.6 

104 

.0063 

2.078 

80.6 

2.071 

79.2 

2.064 

77.8 

2.057 

76.4 

2.051 

75.1 

2.044 

73.8 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


59 


11  PSYCHROMETRICAL    TABLES. 

Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —  Relative  Humidity  in  Hundredths. 


Wet- 

Mean 

t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometera. 

Bulb 
Thermo 
meter 

Vertical 
Difference 
of  Force 

9°.0 

9°.5 

10°.0 

10  .5 

11°.O 

11°.5 

f 

of  Vapor 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

0°.l. 

tive 

tive 

tive 

tive 

tive 

tive 

Force  of 

Hu- 

Force o: 

Hu- 

Force o 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In 

Eng.  In 

Eng.  In 

Eng.  In 

Eng.  In 

32 

0.0007 

0.064 

25.0 

0.058 

22.0 

0.051 

19.2 

0.045 

16.4 

0.038 

13.8 

0.032 

11.2 

33 

.0007 

0.071 

26.7 

0.065 

23.8 

0.058 

21.0 

0.052 

18.3 

0.045 

15.7 

0.039 

13.2 

34 

.0008 

0.079 

28.3 

0.072 

25.5 

0.066 

22.7 

0.059 

20.1 

0.053 

17.5 

0.046 

15.1 

35 

.0005 

0.087 

29.9 

0.080 

27.1 

0.074 

24.4 

0.067 

21.8 

0.061 

19.3 

0.054 

16.9 

36 

0.095 

31.4 

0.088 

28.7 

0.082 

26.0 

0.075 

23.5 

0.069 

21.1 

0.062 

18.7 

.0003 

37 

.0009 

0.103 

33.0 

0.096 

30.3 

0.090 

27.6 

0.083 

25.2 

0.077 

22.8 

0.070 

20.4 

38 

.0009 

0.112 

34.4 

0.105 

31.8 

0.099 

29.2 

0.092 

26.8 

0.086 

24.4 

0.079 

22.1 

39 

0.121 

35.9 

0.114 

33.3 

0.108 

30.7 

0.101 

28.4 

0.094 

26.1 

0.088 

23.8 

40 

.0009 
.0010 

0.130 

37.3 

0.123 

34.8 

0.117 

32.2 

0.110 

29.9 

0.104 

27.6 

0.097 

25.4 

41 

0.139 

38.6 

0.133 

36.2 

0.126 

33.7 

0.120 

31.4 

0.113 

29.2 

0.107 

27.0 

.0010 

42 

0.149 

39.9 

0.143 

37.5 

0.136 

35.0 

0.130 

32.8 

0.123 

30.6 

0.116 

28.4 

43 

.0010 

0.160 

41.1 

0.153 

38.7 

0-146 

36.3 

0.140 

34.1 

0.133 

32.0 

0.127 

29.8 

44 

.0010 
.001  1 

0.170 

42.3 

0.163 

39.9 

0.157 

37.6 

0.150 

35.4 

0.144 

33.3 

0.137 

31.2 

45 

0.181 

43.4 

0.175 

41.1 

0.168 

38.8 

0.161 

36.7 

0.155 

34.6 

0.148 

32.5 

46 

.0011 

0.192 

44.5 

0.186 

42.2 

0.179 

39.9 

0.173 

37.9 

0.166 

35.8 

0.160 

33.8 

.0012 

47 

0.204 

45.5 

0.198 

43.3 

0.191 

41.1 

0.185 

39.0 

0.178 

37.0 

0.171 

35.0 

48 

.0012 

0.217 

46.5 

0.210 

44.3 

0.203 

42.1 

0.197 

40.1 

0.190 

38.1 

0.184 

36.1 

49 

.0012 

0.229 

47.5 

0.222 

45.3 

0.216 

43.2 

0.209 

41.2 

0.203 

39.2 

0.196 

37.2 

50 

.0013 

0.242 

48.4 

0.235 

46.3 

0.229 

44.2 

0.222 

42.2 

0.216 

40.2 

0.209 

38.3 

51 

.0013 

0.255 

49.3 

0.249 

47.2 

0.242 

45.2 

0.236 

43.2 

0.229 

41.2 

0.222 

39.3 

.0014 

52 

0.269 

50.2 

0.263 

48.1 

0.256 

46.1 

0.249 

44.1 

0.243 

42.2 

0.236 

40.3 

53 

.0015 

0.2S4 

61.1 

0.277 

49.0 

0.270 

47.0 

0.264 

45.1 

0.257 

43.2 

0.250 

41.3 

54 

.0015 

0.298 

51.9 

0.292 

49.8 

0.285 

47.9 

0.279 

46.0 

0.272 

44.1 

0.265 

42.3 

55 

.0015 

0.314 

52.7 

0.307 

50.7 

0.300 

48.7 

0.294 

46.8 

0.287 

45.0 

0.281 

43.2 

56 

.0016 

0.330 

53.5 

0.323 

51.4 

0.316 

49.5 

0.310 

47.7 

0.303 

45.9 

0.296 

44.1 

.0016 

57 

0.346 

54.3 

0.339 

52.2 

0.333 

50.3 

0.326 

48.5 

0.319 

46.7 

0.313 

44.9 

58 

.0017 

0.363 

55.0 

0.356 

52.9 

0.350 

51.1 

0.343 

49.2 

0.336 

47.5 

0.330 

45.7 

59 

.0017 

0.380 

55.7 

0.373 

53.6 

0.367 

51.8 

0.360 

50.0 

0.354 

48.2 

0.347 

46.5 

60 

.0018 

0.398 

56.4 

0.391 

54.3 

0.385 

52.5 

0.378 

50.7 

0.371 

49.0 

0.365 

47.3 

61 

.0018 

0.416 

57.0 

0.410 

55.0 

0.403 

53.2 

0.396 

51.4 

0.390 

49.7 

0.383 

48.1 

.0019 

62 

0.436 

57.6 

0.429 

55.6 

0.422 

53.9 

0.416 

52.1 

0.409 

50.4 

0.402 

48.8 

63 

.0020 

0.455 

58.2 

0.449 

56.3 

0.442 

54.5 

0.435 

52.8 

0.429 

51.1 

0.422 

49.5 

64 

.0021 

0.476 

58.8 

0.469 

56.9 

0.462 

55.1 

0.456 

53.4 

0.449 

51.8 

0.442 

50.2 

65 

.0021 

0.497 

59.3 

0.490 

57.5 

0.483 

55.8 

0.477 

54.1 

0.470 

52.4 

0.463 

50.8 

66 

.0022 

0.519 

59.9 

0.512 

58.0 

0.505 

56.3 

0.498 

54.7 

0.492 

53.1 

0.485 

51.5 

67 

.0023 

0.542 

60.3 

0.534 

58.6 

0.527 

56»9 

0.521 

55.3 

0.514 

53.7 

0.507 

52.1 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


60 


PSYCHROMETRICAL    TABLES.  12 

Temperature,  Fahrenheit.  — Force  of  Vapor  in.  English  Inches.  —  Relative  Humidity  in  Hundredths. 


iVct- 

t  —  t1,  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Bulb 
Thermo 

Vertical 
Difference 

9°.0 

9°.5 

1O°.O 

10°.5 

11°.0 

110.5 

meter 

of  Force 
of  Vapor 

Fahren- 

for each 

Rela- 

I Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

0^.1. 

tive 

i    tive 

tive 

tive 

tive 

tive 

Force  of 

Hu- 

Force of    Hu- 

Force  of    Hu- 

Force  of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor.     mid. 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

• 

Eng.  In. 

68 

0.0024 

0.564 

60.8 

0.557 

59.1 

0.550 

57.4 

0.544 

55.8 

0.537 

54.2 

0.530 

52.7 

69 

0.588 

61.3 

0.581 

59.6 

0.574 

58.0 

0.567 

56.4 

0.561 

54.8 

0.554 

53.3 

.0025 

70 

.0025 

0.612 

61.8 

0.605 

60.1 

0.598 

58.5 

0.592 

56.9 

0.585 

55.4 

0.578 

53.8 

71 

.0026 

0.637 

62.3 

0.630 

60.6 

0.624 

59.0 

0.617 

57.4 

0.610 

55.9 

0.603 

54.4 

72 

0.663 

62.7 

0.656 

61.1 

0.650 

59.5 

0.643 

58.0 

0.636 

56.4 

0.629 

54.9 

.0027 

73 

0.390 

63.2 

0.683 

61.6 

0.677 

60.0 

0.670 

58.4 

0.663 

56.9 

0.656 

55.5 

.0027 

74 

.0023 

0.718 

63.6 

0.711 

62.0 

0.704 

60.5 

0.697 

58.9 

0.691 

57.4 

0.684 

56.0 

75 

.0029 

0.746 

64.0 

0.739 

62.5 

0.733 

60.9 

0.726 

59.4 

0.719 

57.9 

0.712 

56.5 

76 

0.775 

64.4 

0.769 

62.9 

0.762 

61.3 

0.755 

59.8 

0.748 

58.4 

0.741 

56.9 

.0030 

77 

0.805 

64.8 

0.799 

63.3 

0.792 

61.8 

0.785 

60.3 

0.778 

58.8 

0.772 

57.4 

.0031 

78 

.0032 

0.836 

65.2 

0.829 

63.7 

0.823 

62.2 

0.816 

60.7 

0.809 

59.2 

0.802 

57.8 

79 

0.868 

65.6 

0.861 

64.1 

0.855 

62.6 

0.848 

61.1 

0.841 

59.7 

0.834 

58.3 

.0033 

80 

0.901 

66.0 

0.894 

64.5 

0.897 

63.0 

0.881 

61.5 

0.874 

60.1 

0.867 

58.7 

81 

.0034 
.0035 

0.935 

66.3 

0.928 

64.8 

0.921 

63.4 

0.914 

61.9 

0.908 

60.5 

0.901 

59.1 

82 

0.970 

66.7 

0.963 

65.2 

0.956 

63.7 

0.949 

62.3 

0.943 

60.9 

0.936 

59.5 

.0036 

83 

1.006 

67.0 

0.999 

65.5 

0.992 

64.1 

0.985 

62.7 

0.978 

61.3 

0.972 

59.9 

84 

.0037 

1.042 

67.3 

1.036 

65.9 

1.029 

64.4 

1.022 

63.0 

.015 

61.7 

1.008 

60.3 

85 

.0033 
.0039 

1.080 

67.7 

1.073 

66.2 

1.067 

64.8 

1.060 

63.4 

.053 

62.0 

1.046. 

60.7 

86 

1.119 

68.0 

1.112 

66.5 

1.106 

65.1 

1.099 

63.7 

.092 

62.4 

1.085 

61.0 

§7 

.0040 

1.160 

68.3 

1.153 

66.8 

1.146 

65.4 

1.140 

64.1 

.133 

62.7 

1.126 

61.4 

.0041 

88 

1.200 

68.6 

1.194 

67.1 

1.187 

65.8 

1.180 

64.4 

.173 

63.1 

1.166 

61.7 

89 

.0042 

1.243 

68.9 

1.236 

67.4 

1.229 

66.1 

1.222 

64.7 

.215 

63.4 

1.208 

62.1 

90 

.0044 

1.286 

69.1 

1.279 

67.7 

1.273 

66.4 

1.266 

65.0 

.259 

63.7 

1.252 

62.4 

91 

.0045 

1.331 

69.4 

1.324 

68.0 

1.317 

66.7 

1.311 

65.3 

1.304 

64.0 

1.297 

62.7 

92 

.0046 

1.377 

69.7 

1.370 

68.3 

1.363 

67.0 

1.357 

65.6 

1.350 

64.3 

1.343 

63.1 

'.0047 

( 

93 

1.425 

69.9 

1.418 

68.6 

1.411 

67.2 

1.404 

65.9 

1.397 

64.6 

1.390 

63.4 

94 

.0048 

1.473 

70.2 

1.466 

68.8 

1.459 

67.5 

1.452 

66.2 

'.446 

64.9 

.439 

63.7 

95 

.0050 

1.523 

70.4 

1.516 

69.1 

1.509 

67.8 

1.502 

66.5 

.495 

65.2 

.488 

64.0 

96 

.0051 

1.574 

70.7 

1.567 

69.4 

1.560 

68.0 

1.553 

66.7 

.546 

65.5 

.539 

64.2 

97 

.0053 

1.627 

70.9 

1.620 

69.6 

1.613 

68.3 

1.606 

67.0 

.599 

65.8 

.592 

64.5 

98 

.0054 

1.681 

71.2 

1.674 

69.8 

1.667 

68.5 

1.660 

67.3 

.653 

66.0 

.646 

64.8 

.005C 

99 

1.736 

71.4 

1.729 

70.1 

1.722 

68.8 

1.716 

67.5 

.709 

66.3 

.702 

65.1 

100 

.0057 

1.793 

71.6 

1.786 

70.3 

1.780 

69.0 

1.773 

67.8 

.766 

66.5 

.759 

65.3 

101 

.0053 

1.852 

71.8 

1.845 

70.5 

1.838 

69.3 

1.831 

68.0 

.824 

66.8 

.817 

65.6 

102 

.0060 

1.912 

72.0 

1.905 

70.8 

1.898 

69.5 

1.891 

68.2 

.884 

67.0 

.877 

65.8 

103 

.0062 

1.974 

72.3 

1.967 

71.0 

1.960 

69.7 

1.953 

68.5 

.946 

67.3 

.939 

66.1 

104 

.0063 

2.037 

72.5 

2.030 

71.2 

2.023 

69.9 

2.016 

68.7 

2.009 

67.5 

2.002 

66.3 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


61 


13  PSYCHROMETRICAL    TABLES. 

Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —  Relative  Humidity  in  Hundredths. 


TCTrt*- 

t  —  t  ,  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Wet- 
Bulb 
Thermo- 

Mean 
Vertical 
Difference 

120.0 

120.5 

13°.0 

13°.5 

140.0 

140.5 

meter 

of  Force 

Fahren- 

of Vapor 
for  each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

QO  1 

tive 

tive 

tive 

1 

tive 

tive 

tive 

Force  of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

32 

0.025 

8.8 

0.019 

6.4 

0.012 

4.1 

33 

0.0007 

0.032 

10.8 

0.026 

8.4 

0.019 

6.2 

0.013 

4.0 

34 

.0007 

0.040 

12.7 

0.033 

10.4 

0.027 

8.2 

0.020 

6.0 

0.014 

4.1 

35 

.0007 

0.048 

14.6 

0.041 

12.3 

0.034 

10.1 

0.028 

8.0 

0.021 

6.1 

0.015 

4.2 

36 

.0008 

0.056 

16.4 

0.049 

14.2 

0.042 

12.0 

0.036 

10.0 

0.029 

8.1 

0.023 

6.2 

.0008 

37 

0.064 

18.2 

0.057 

16.0 

0.051 

13.9 

0.044 

11.9 

0.038 

10.0 

0.031 

8.2 

38 

.0009 

0.072 

19.9 

0.066 

17.8 

0.059 

15.7 

0.053 

13.7 

0.046 

11.9 

0.040 

10.1 

39 

.0009 

0.081 

21.6 

0.075 

19.5 

0.068 

17.5 

0.062 

15.5 

0.055 

13.7 

0.049 

11.9 

40 

.0009 

0.091 

23.3 

0.084 

21.2 

0.078 

19.2 

0.071 

17.2 

0.064 

15.4 

0.058 

13.6 

41 

.0010 

0.100 

24.9 

0.094 

22.8 

0.087 

20.8 

0.081 

18.9 

0.074 

17.1 

0.067 

15.3 

.0010 

42 

0.110 

26.4 

0.103 

24.3 

0.097 

22.4 

0.090 

20.5 

0.084 

18.6 

0.077 

16.8 

43 

.0010 

0.120 

27.8 

0.114 

25.8 

0.107 

23.9 

0.100 

22.0 

0.095 

20.1 

0.087 

18.3 

44 

.0011 

0.131 

29.2 

0.124 

27.2 

0.118 

25.3 

0.111 

23.5 

0.104 

21.5 

0.098 

19.8 

45 

.0011 

0.142 

30.5 

0.135 

28.6 

0.129 

26.7 

0.122 

24.9 

0.115 

22.9 

0.109 

21.2 

46 

.0011 

0.153 

31.8 

0.146 

30.0 

0.140 

28.1 

0.133 

26.3 

0.127 

24.3 

0.119 

22.7 

.0012 

47 

0.165 

33.0 

0.158 

31.2 

0.152 

29.3 

0.145 

27.6 

0.138 

25  7 

0.132 

24.0 

48 

.0012 

0.177 

34.2 

0.170 

32.4 

0.164 

30.6 

0.157 

28.8 

0.151 

27.0 

0.144 

25.4 

49 

.0013 

0.190 

35.3 

0.183 

33.5 

0.176 

31.7 

0.170 

30.0 

0.163 

28.3 

0.157 

26.7 

50 

.0013 

0.202 

36.4 

0.196 

34.6 

0.189 

32.9 

0.183 

31.2 

0.176 

29.5 

0.169 

27.9 

51 

.0014 

0.216 

37.5 

0.209 

35.7 

0.202 

34.0 

0.196 

32.3 

0.189 

30.7 

0.183 

29.1 

.0014 

52 

0.229 

38.5 

0.223 

36.8 

0.216 

35.1 

0.210 

33.4 

0.203 

31.8 

0.196 

30.2 

53 

.0014 

0.244 

39.5 

0.237 

37.8 

0.231 

36. 

0.224 

34.5 

0.217 

32.9 

0.211 

31.4 

54 

.0015 

0.259 

40.5 

0-252 

38.8 

0.245 

37. 

0.239 

35.5 

0.232 

34.0 

0.226 

32.4 

55 

.0015 

0.274 

41.5 

0.267 

39.8 

0.261 

38. 

0.254 

36.5 

0.247 

35.0 

0.241 

33.5 

56 

.0016 

0.290 

42.4 

0.283 

40.7 

0.276 

39. 

0.270 

37.5 

0.263 

35.9 

0.257 

34.4 

57 

.0016 

0.306 

43.2 

0.299 

41.6 

0.293 

40.0 

0.286 

38.4 

0.280 

36.9 

0.273 

35.4 

58 

.0017 

0.323 

'44.1 

0.316 

42.4 

0.310 

40.8 

0.303 

39.3 

0.296 

37.8 

0.290 

36.3 

59 

.0017 

0.340 

44.9 

0.334 

43.3 

0.327 

41.7 

0.320 

40.1 

0.314 

38.7 

0.307 

37.2 

60 

.0018 

0.358 

45.7 

0.351 

44.1 

0.345 

42.5 

0.338 

41.0 

0.331 

39.5 

0.325 

38.1 

61 

.0018 

0.376 

46.4 

0.370 

44.9 

0.363 

43.3 

0.356 

41.8 

0.350 

40.3 

0.343 

38.9 

62 

.0019 

0.396 

47.2 

0.389 

45.6 

0.382 

44.1 

0.376 

42.6 

0.369 

11.2 

0.362 

39.8 

63 

.0020 

0.415 

47.9 

0.409 

46.4 

0.402 

44.8 

0.395 

43.4 

0.389 

41.9 

0.382 

40.6 

64 

.0021 

0.436 

48.6 

0.429 

47.1 

0.422 

45.6 

0.416 

44.1 

0.409 

42.7 

0.402 

41.3 

65 

.0021 

0.457 

49.3 

0.450 

47.8 

(K443 

46.3 

0.437 

44.8 

0.431 

43.4 

0.423 

42.1 

66 

.C022 

0.478 

49.9 

0.472 

48.4 

0.465 

47.0 

0.458 

45.5 

0.452 

44.1 

0.445 

42.8 

67 

.0023 

0.501 

50.6 

0.494 

49.1 

0.487 

47.6 

0.481 

46.2 

0.474 

44.8 

0.467 

43.5 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


PSYCHROMETRICAL    TABLES. 
Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —Relative  Humidity  in  Hundredths. 


14 


TTTpi 

Mpin 

t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

w  ec- 
Bulb 
Thermo- 

jiezin 
Vertical 
Difference 

12°.0 

12°.5 

13°.0 

13°.5 

14°.0 

14°.5 

meter 

of  Force 

t' 

of  Vapor 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

0°.l. 

tive 

tive 

tive 

tive 

tive 

tive 

Force  of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force o 

Hu- 

Force of 

Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity- 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In 

Eng.  In 

Eng.  In 

Eng  In 

63 

0.0024 

0.524 

51.2 

0.517 

49.7 

0.510 

48.3 

0.503 

46.9 

0.497 

45.5 

0.490 

44.1 

69 

.0024 

0.547 

51.8 

0.541 

50.3 

0.534 

48.9 

0.527 

47.5 

0.520 

46.1 

0.514 

44.8 

70 

.0025 

0.572 

52.4 

0.565 

50.9 

0.558 

.49.5 

0.551 

48.1 

0.545 

46.8 

0.533 

45.5 

71 

.0026 

0.597 

52.9 

0.590 

51.5 

0.583 

50.1 

0.577 

48.7 

0.570 

47.4 

0.563 

46.1 

72 

0.623 

53.5 

0.616 

52.1 

0.609 

50.7 

0.603 

49.3, 

0.596 

48.0 

0.589 

46.7 

.0026 

73 

.0027 

0.650 

54.0 

0.6^3 

52.6 

0.636 

51.3 

0.629 

49.9 

0.623 

48.6 

0.616 

47.3 

74 

.0028 

0.677 

54.5 

0.670 

53.2 

0.664 

51.8 

0.657 

50.5 

0.650 

49.2 

0.643 

47.9 

75 

.0029 

0.705 

55.0 

0.699 

53.7 

0.602 

52.3 

0.685 

51.0 

0.678 

49.7 

0.672 

48.4 

76 

.Of.30 

0.735 

55.5 

0.728 

54.2 

0.721 

52.9 

0.714 

51.5 

0.708 

50.3 

0.701 

48.9 

77 

0.765 

56.0 

0.759 

54.7 

0.752 

53.4 

0.745 

52.1 

0.739 

50.8 

0.731 

49.5 

.0031 

73 

.0032 

0.796 

56.5 

0.782 

55.2 

0.782 

53.8 

0.775 

52.5 

0.768 

51.3 

0.762 

50.0 

79 

.0033 

0.827 

56.9 

0.821 

55.6 

0.814 

54.3 

0.807 

53.0 

0.800 

51.8 

0.794 

50.5 

80 

.0034 

0.360 

57.3 

0.853 

56.1 

0.847 

54.8 

0.840 

53.5 

0.833 

52.2 

0.826 

51.0 

81 

.0035 

0.894 

57.8 

0.887 

56.5 

0.880 

55.2 

0.874 

53.9 

0.867 

52.7 

0.860 

51.4 

82 

0.929 

58.2 

0.922 

56.9 

0.915 

55.6 

0.909 

54.4 

0.902 

53.2 

0.895 

51.9 

.0036 

83 

.0037 

0.965 

58.6 

0.958 

57.3 

0.951 

56.1 

0.944 

54.8 

0.937 

53.6 

0.931 

52.4 

84 

.0038 

1.002 

59.0 

0.995 

57.7 

0.988 

56.5 

0.981 

55.2 

0.974 

54.0 

0.968 

52.8 

85 

.0039 

1.039 

59.4 

1.033 

58.1 

1.026 

56.8 

1.019 

55.6 

.012 

54.4 

1.005 

53.2 

86 

1.078 

59.7 

1.071 

58.5 

1.065 

57.2 

1.058 

56.0 

.051 

54.8 

1.044 

53.6 

.0040 

$7 

1.119 

60.1 

1.112 

58.8 

1.105 

57.6 

1.099 

56.4 

.092 

55.2 

1.085 

54.0 

.0041 

88 

1.159 

60.5 

1.152 

59.2 

1.146 

58.0 

1.139 

56.8 

.132 

55.6 

1.125 

54.4 

89 

.0042 

1.202 

60.9 

1.195 

59.6 

1.188 

58.3 

1.181 

57.1 

.174 

56.0 

1.167 

54.8 

90 

.0044 

1.245 

61.3 

1.238 

59.9 

1.231 

58.7 

1.225 

57.5 

.218 

56.3 

1.211 

55.2 

.0045 

91 

1.290 

61.6 

1  .283 

60.2 

1.276 

59.0 

1.269 

57.9 

1.263 

66.7 

1.256 

55.6 

.0046 

92 

1.336 

61.9 

1.329 

60.6 

1.322 

59.4 

1.315 

58.2 

1.309 

57.0 

1.302 

55.9 

.0047 

93 

1.383 

62.2 

1.376 

60.9 

1.370 

59-7 

1.363 

58.5 

1.356 

57.4 

1.349 

56.3 

94 

.0049 

1.432 

62.5 

1.425 

61.2 

1.418 

60.0 

1.411 

58.9 

1.404 

57.7 

1.397 

56.6 

95 

.0050 

1.482 

62.7 

1.475 

61.5 

1.468 

60.4 

1.461 

59.2 

1.454 

58.1 

1.447 

57.0 

96 

.0051 

1.533 

63.0 

1.526 

61.8 

1.519 

60.7 

1.512 

59.5 

1.505 

58.4 

1.498 

57.3 

97 

.0052 

1.585 

63.3 

1.578 

62.1 

1.571 

61.0 

1.564 

59.8 

1.558 

58.7 

1.551 

57.6 

98 

.0054 

1.639 

63.6 

1.632 

62.4 

1.625 

61.3 

1.618 

60.1 

1.612 

59.0 

1.605 

57.9 

.0056 

99 

1.695 

63.9 

1.688 

62.7 

1.681 

61.6 

1.674 

60.4 

1.667 

59.3 

1.660 

58.2 

100 

.0057 

1.752 

64.2 

1.745 

63.0 

1.738 

62.0 

1.731 

60.7 

1.724 

59.6 

1.717 

58.5 

101 

.0059 

1.810 

64.4 

1.803 

63.2 

1.797 

62.3 

1.790 

61.0 

1.783 

59.9 

1.776 

58.8 

102 

.0060 

1.870 

64.7 

1.863 

63.5 

1.S57 

62.6 

1.850 

61.3 

1.843 

60.2 

1.836 

59.1 

103 

.0062 

1.932 

64.9 

1.925 

63.8 

1.918 

62.9 

1.911 

61.5 

1.904 

60.4 

1.897 

59.4 

104 

.0063 

1.995 

65.2 

1.988 

64.0 

1.981 

63.2 

1.974 

61.8 

1.967 

60.7 

1.960 

59.6 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


63 


15  PSYCHROMETRICAL    TABLES. 

Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —Relative  Humidity  in  Hundredths, 


Wet- 

M63.il 

t  —  t(,  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Bulb 
Thermo- 
meter 

Vertical 
Difference 
of  Force 

15°.0 

15°.5 

16°.0 

16°.5 

17°.O 

1?°.5 

f 

of  Vapor 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

1 

0°.l. 

Force  of 
Vapor. 

tive 
Hu- 
mid- 

Force o; 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force o: 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

ity. 

ity- 

ity. 

ity. 

ity. 

ity. 

0 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In 

Eng.  In. 

32 

33 

34 

35 

36 

0.016 

4.4 

0.0009 

37 

0.025 

6.4 

0.018 

4.6 

.0009 

38 

.0009 

0.033 

8.3 

0.027 

6.5 

0.020 

4.8 

0.014 

3.2 

39 

.0009 

0.042 

10.1 

0.036 

8.4 

0.029 

6.7 

0.023 

5.1 

0.016 

3.6 

0.010 

2.1 

40 

.0010 

0.051 

11.9 

0.045 

10.1 

0.038 

8.5 

0.032 

6.9 

0.025 

5.4 

0.019 

3.9 

41 

0.061 

13.6 

0.054 

11.8 

0.048 

10.3 

0.041 

8.7 

0.035 

7.2 

0.028 

5.7 

.0010 

42 

0.071 

15.1 

0.064 

13.4 

0.058 

11.9 

0.051 

10.3 

0.044 

8.8 

0.038 

7.4 

.0010 

43 

0.081 

16.6 

0.074 

15.0 

0.068 

13.4 

0.061 

11.9 

0.055 

'10.4 

0.048 

9.0 

44 

.0011 
.0011 

0.091 

18.1 

0.085 

16.5 

0.078 

15.0 

0.072 

13.5 

0.065 

12.0 

0.058 

10.6 

45 

0.102 

19.6 

0.096 

18.0 

0.089 

16.5 

0.083 

15.0 

0.076 

13.5 

0.069 

12.1 

.0011 

46 

0.114 

21.0 

0.107 

19.4 

0.100 

17.9 

0.094 

16.4 

0.087 

15.0 

0.081 

13.6 

.0012 

47 

0.125 

22.4 

0.119 

20.8 

0.112 

19.3 

0.106 

17.9 

0.099 

16.5 

0.092 

15.1    I 

48 

.0012 

0.137 

23.8 

0.131 

22.2 

0.124 

20.7 

0.118 

19.3 

0.111 

17.9 

0.104 

16.5 

49 

.0013 

0.150 

25.1 

0.143 

23.6 

0.137 

22.1 

0.130 

20.7 

0.124 

19.3 

0.117 

17.9 

.0013 

50 

0.163 

26.4 

0.156 

24.9 

0.150 

23.4 

0.143 

22.0 

0.136 

20.6 

0.130 

19.3 

51 

.0013 

0.176 

27.6 

0.169 

26.1 

0.163 

24.6 

0.156 

23.2 

0.150 

21.9 

0.143 

20.6 

.0014 

52 

0.190 

28.7 

0.183 

27.3 

0.177 

25.8 

0.170 

24.4 

0.163 

23.1 

0.157 

21.8 

53 

.0014 

0.204 

29.9 

0.197 

28.4 

0.191 

27.0 

0.184 

25.6 

0.178 

24.3 

0.171 

23.0 

54 

.0015 

0.219 

30.9 

0.212 

29.5 

0.206 

28.1 

0.199 

26.7 

0.192 

25.4 

0.186 

24.1 

55 

.0015 

0.234 

32.0 

0.228 

30.6 

0.221 

29.2 

0.214 

27.8 

0.208 

26.5 

0.201 

25.2 

56 

.0016 

0.250 

33.0 

0.243 

31.6 

0.237 

30.2 

0.230 

2S.9 

0.223 

27.6 

0.217 

26.3 

.0016 

57 

0.266 

34.0 

0.260 

32.6 

0.253 

31.2 

0.246 

29.9 

0.240 

28.6 

0.233 

27.3 

58 

.0017 

0.283 

34.9 

0.276 

33.5 

0.270 

32.2 

0.268 

30.8 

0.256 

29.6 

0.249 

28.3 

59 

.0017 

0.300 

35.8 

0.294 

34.4 

0.287 

33.1 

0.280 

31.8 

0.274 

30.5 

0.267 

29.3 

60 

.0018 

0.318 

36.7 

0.311 

35.3 

0.305 

34.0 

0.298 

32.7 

0.291 

31.4 

0.285 

30.2 

61 

.0019 

0.336 

37.5 

0.330 

36.2 

0.323 

34.9 

0.316 

33.6 

0.310 

32.4 

0.303 

31.2 

.0019 

62 

0.356 

38.4 

0.349 

37.0 

0.342 

35.7 

0.336 

34.5 

0.329 

33.2 

0.322 

32.0 

63 

.0020 

0.375 

39.2 

0.369 

37.9 

0.362 

36.6 

0.355 

35.3 

0.349 

34.1 

0.342 

32.9 

64 

,  .0020 

0.396 

40.0 

0.389 

38.7 

0.382 

37.4 

0.376 

36.1 

0.369 

34.9 

0.362 

33.7 

65 

.0021 

0.417 

40.7 

0.410 

39.4 

0.403 

38.2 

0.396 

36.9 

0.390 

35.7 

0.383 

34.5 

66 

.0022 

0.438 

41.5 

0.431 

40.2 

0.425 

38.9 

0.418 

37.7 

0.411 

36.5 

0.405 

35.3 

67 

.0023 

0.460 

42.2 

0.454 

40.9 

0.447 

39.6 

0.440 

38.4 

0.434 

37.2 

0.427 

36.1 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


64 


PSYCHROMETRICAL    TABLES. 
Temperature,  Fahrenheit.  — Force  of  Vapor  in  English  Inches.  — Relative  Humidity  in  Hundredths. 


16 


TTT-f 

ATaoYi 

t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

vv  ct- 
Bulb 
Thermo 

Jxiean 
Vertical 
Difference 

I5°.O 

15°.5 

16°.O 

16°.5 

17°.0 

1T°.5 

meter 
ft 

of  Force 

Fahren- 

for each 

Rela- 

Rela- 

!  Rela- 

Rela- 

Rela- 

Rela- 

heit. 

0°.l. 

tive 

tive 

tive 

tive 

tive 

tive 

Force  of 

Hu- 

Force of 

Hu- 

Force of    jju_ 

Force  of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. |  m}d. 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

68 

0.483 

42.8 

0.477 

41.6 

0.470 

40.3 

0.463 

39.1 

0.456 

37.9 

0.450 

36.8 

69 

0.0024 

0.507 

43.5 

0.500 

42.3 

0.594 

41.0 

0.487 

39.8 

0.480 

38.7 

0.473 

37.5 

70 

.0024 

0.531 

44.2 

0.524 

42.9 

0.518 

41.7 

0.511 

40.5 

0.504 

39.3 

0.498 

38.2 

71 

.0025 

0.556 

44.8 

0.550 

43.6 

0.543 

42.4 

0.536 

41.2 

0.529 

40.0 

0.523 

38.9 

72 

.0026 

0.582 

45.4 

0.576 

44.2 

0.569 

43.0 

0.562 

41.8 

0.555 

40.7 

0.549 

39.5 

.0027 

73 

0.609 

46.0 

0.602 

44.8 

0.596 

43.6 

0.589 

42.4 

0.582 

41.3 

0.575 

40.2 

.0028 

74 

0.637 

46.6 

0.630 

45.4 

0.623 

44.2 

0.616 

43.0 

0.610 

41.9 

0.603 

40.8 

75 

.0028 

0.665 

47.2 

0.658 

46.0 

0.651 

44.8 

0.645 

43.6 

0.638 

42.5 

0.631 

41.4 

76 

.0029 

0.694 

47.7 

0.687 

46.5 

0.681 

45.4 

0.674 

44.2 

0.667 

43.1 

0.660 

42.0 

.0030 

77 

0.724 

48.2 

0.717 

47.1 

0.711 

45.9 

0.704 

44.8 

0.697 

43.6 

0.690 

42.6 

.0031 

78 

0.755 

48.8 

0.748 

47.6 

0.741 

46.4 

0.735 

45.3 

0.728 

44.2 

0.721 

43.1 

79 

.0032 

0.787 

49.3 

0.780 

48.1 

0.773 

47.0 

0.766 

45.8 

0.760 

44.7 

0.753 

43.7 

80 

.0033 

0.820 

49.8 

0.813 

48.6 

0.806 

47.5 

0.799 

46.4 

0.792 

45.3 

0.786 

44.2 

81 

'.0034 

0.853 

50.3 

0.847 

49.1 

0.840 

48.0 

0.833 

46.9 

0.826 

45.8 

0.819 

44.6 

82 

.0035 

0.888 

50.7 

0.881 

49.6 

0.875 

48.5 

0.868 

47.4 

0.861 

46.3 

0.854 

45.1 

.0036 

83 

0.924 

51.2 

0.917 

50.0 

0.910 

48.9 

0.903 

47.8 

0.897 

46.8 

0.890 

45.6 

84 

.0037 

0.961 

51.6 

0.954 

50.5 

0.947 

49.4 

0.940 

48.3 

0.933 

47.2 

0.927 

46.2 

85 

.0038 

0.998 

52.1 

0.992 

50.9 

0.985 

49.8 

0.978 

48.7 

0.971 

47.7 

0.964 

46.6 

86 

.0039 

1.037 

52.5 

1.030 

51.3 

1.024 

50.3 

1.017 

49.2 

1.010 

48.1 

1.003 

47.1 

87 

.0040 

1.078 

52.9 

1.071 

51.8 

1.064 

50.7 

1.058 

49.6 

1.051 

48.6 

1.044 

47.5 

.0041 

88 

1.118 

53.3 

1.111 

52.2 

1.105 

51.1 

1.098 

50.0 

1.091 

49.0 

1.084 

48.0 

89 

.0042 

1.161 

53.7 

1.154 

52.6 

1.147 

51.5 

1.140 

50.4 

1.133 

49.4 

1.126 

48.4 

90 

.0044 

1.204 

54.1 

1.197 

53.0 

1.190 

51.9 

1.183 

50.9 

1.177 

49.8 

1.170 

48.8 

91 

.0045 

1.249 

54.5 

1.242 

53.4 

1.235 

52.3 

1.228 

51.2 

1.221 

50.2 

1.215 

49.2 

92 

.0046 

1.295 

54.8 

1.288 

53.7 

1.281 

52.7 

1.274 

51.6 

1.267 

50.6 

1.260 

49.6 

.0048 

93 

1.342 

55.2 

1.335 

54.1 

1.328 

53.0 

1.321 

52.0 

1.315 

51.0 

1.308 

50.0 

94 

.0049 

1.390 

55.5 

1.384 

54.4 

1.377 

53.4 

1.370 

52.4 

1.363 

51.4 

1.356 

50.4 

95 

.0050 

1.440 

55.9 

1.433 

54.8 

1.426 

53.7 

1.420 

52.7 

.413 

51.7 

1.406 

50.7 

96 

.0051 

1.491 

56.2 

1.484 

55.1 

1.477 

54.1 

1.471 

53.1 

.464 

52.1 

1.457 

51.1 

97 

.0053 

1.544 

56.5 

1.537 

55.5 

1.530 

54.4 

1.523 

53.4 

.516 

52.4 

1.509 

51.5 

98 

.0054 

1.598 

56.8 

1.591 

55.8 

1.584 

54.8 

1.577 

53.8 

.570 

52.8 

1.563 

51.8 

.0050 

99 

1.653 

57.2 

1.646 

56.1 

1.639 

55.1 

1.633 

54.1 

.626 

53.1 

1.619 

52.1 

100 

.0057 

1.710 

57.5 

1.703 

56.4 

1.696 

55.4 

1.690 

54.4 

.683 

53.4 

1.676 

52.5 

101 

.0059 

1.769 

57.8 

1.762 

56.7 

1.755 

55.7 

1.748 

54.7 

.741 

53.7 

1.734 

52.8 

102 

.0060 

1.829 

58.0 

1.822 

57.0 

1.815 

56.0 

1.809 

55.0 

.802 

54.0 

1.794 

53.1 

103 

.0062 

1.890 

58.3 

1.883 

57.3 

1.876 

56.3 

1.869 

55.3 

.863 

54.3 

1.856 

53.4 

104 

.0063 

1.953 

58.6 

1.946 

57.6 

1.939 

56.6 

1.932 

55.6 

.925 

54.6 

1.919 

53.7 

Mean  Horizontal  Difference  of  Force  of  Yapor  for  each  0°.l  =  0.0013. 

B 


65 


17  PSYCHROMETRICAL    TABLES. 

Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —Relative  Humidity  in  Hundredths. 


Wet- 

M_r>t-» 

t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Bulb 
Thermo 

Cclll 

Vertical 
Difference 

18°.O 

18°.5 

19°.O 

190.5 

2O°.O 

20°  5 

meter 

of  Force 
of  Vapor 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

0°.l. 

Force  of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force o 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force oi 
Vapor. 

tive 
Hu- 
mid- 

ity. 

ity. 

ity- 

ity. 

ity. 

ity. 

o 

Eng.  In 

Eng.  In 

Eng.  In 

Eng.  In 

Eng.  In. 

Eng.  In. 

32 

33 

34 

35 

36 

37 

38 

39 

40 

0.012 

2.5 

41 

0.0010 

0.022 

4.3 

0.015 

3.0 

0.009 

1.6 

.0010 

42 

0.031 

6.0 

0.025 

4.6 

0.018 

3.3 

0.012 

2.1 

43 

.0010 

0.041 

7.6 

0.035 

6.3 

0.028 

5.0 

0.022 

3.7 

0.015 

2.6 

44 

.0011 

0.052 

9.2 

0.045 

7.9 

0.039 

6.6 

0.032 

5.4 

0.026 

4.3 

0.019 

3.2 

45 

.0011 

0.063 

10.8 

0.056 

9.5 

0.050 

8.2 

0.043 

7.0 

0.037 

5.9 

0.030 

4.8 

46 

.0011 

0.074 

12.3 

0.068 

11.0 

0.061 

9.7 

0.054 

8.5 

0.048 

7.5 

0.041 

6.3 

.0012 

47 

0.086 

13.8 

0.079 

12.5 

0.073 

11.2 

0.066 

10.0 

0.059 

9.0 

0.053 

7.9 

48 

.0012 

0.098 

15.2 

0.091 

13.9 

0.085 

12.7 

0.078 

11.5 

0.072 

10.4 

0.065 

9.3 

49 

.0013 

0.110 

16.6 

0.104 

15.4 

0.097 

14.1 

0.091 

12.9 

0.084 

11.9 

0.077 

10.7 

50 

.0013 

0.123 

18.0 

0.117 

16.7 

0.110 

15.5 

0.103 

14.4 

0.097 

13.2 

0.090 

12.1 

51 

.0013 

0.136 

19.3 

0.130 

18.0 

0.123 

16.8 

0.117 

15.7 

0.110 

14.5 

0.103 

13.4 

.0014 

• 

52 

0.150 

20.5 

0.144 

19.3 

0.137 

18.1 

0.130 

16.9 

0.124 

15.7 

0.117 

14.6 

53 

.0014 

0.164 

21.7 

0.158 

20.5 

0.151 

19.3 

0.145 

18.2 

0.138 

16.9 

0.131 

15.8 

54 

.0015 

0.179 

22.9 

0.173 

21.7 

0.166 

20.5 

0.159 

19.3 

0.152 

18.1 

0.146 

17.0 

55 

.0015 

0.194 

24.0 

0.188 

22.8 

0.181 

21.6 

0.174 

20.5 

0.168 

19.2 

0.161 

18.2 

56 

.0016 

0.210 

25.1 

0.203 

23.9 

0.197 

22.7 

0.190 

21.6 

0.184 

20.4 

0.177 

19.3 

.0016 

57 

0.226 

26.1 

0.220 

24.9 

0.213 

23.8 

0.206 

22.7 

0.200 

21.5 

0.193 

20.4 

58 

.0017 

0.243 

27.1 

0.236 

25.9 

0.230 

24.8 

0.223 

23.7 

0.217 

22.6 

0.210 

21.5 

59 

.0017 

0.260 

28.1 

0.254 

26.9 

0.247 

25.8 

0.240 

24.7 

0.234 

23.6 

0.227 

22.6 

60 

.0018 

0.278 

29.0 

0.271 

27.9 

0.265 

26.8 

0.258 

25.7 

0.251 

24.6 

0.245 

23.6 

61 

.0019 

0.296 

30.0 

0.290 

28.8 

0.283 

27.7 

0.276. 

26.6 

0.270 

25.5 

0.263 

24.5 

.0019 

62 

0.316 

30.9 

0.309 

29.7 

0.302 

28.6 

0.295 

27.5 

0.289 

26.5 

0.282 

25.4 

63 

.0020 

0.335 

31.7 

0.328 

30.6 

0.322 

29.5 

0.315 

28.4 

0.308 

27.4 

0.302 

26.4 

64 

.0020 

0.355 

32.6 

0.349 

31.5 

0.342 

30.4 

0.335 

29.3 

0.329 

28.2 

0.322 

27.2 

65 

.0021 

0.376 

33.4 

0.370 

32.3 

0.363 

31.2 

0.356 

30.1 

0.350 

29.1 

0.3J3 

28.1 

66 

.0022 

0.398 

34.2 

0.391 

33.1 

0.385 

32.0 

0.378 

30.9 

0.371 

29.9 

0.364 

28.9 

67 

.0023 

0.420 

34.9 

0.414 

33.8 

0.407 

32.8 

0.400 

31.7 

0.393 

30.7 

0.387 

29.7 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


66 


PSYCHROMETRICAL    TABLES.  18 

Temperature,  Fahrenheit.  —Force  of  Vapor  in  English  Inches.  —  Relative  Humidity  hi  Hundredths. 


t  —  I',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Wet- 
Bulb 
!  Thermo- 

3Icnn 
Vertical 
Difference 

18°.O 

18°.5 

19°.0 

19°.5 

2O°.O 

20°.5 

meter 

of  Force 

£i 

of  Vapor 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

0°.l. 

Force  of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force of 
Vapor. 

tive 
Hu- 
mid- 

Force o 
Vapor. 

tive 
Hu- 
mid- 

Force o 
Vapor. 

tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

3ng.  In. 

Eng.  In. 

Eng.  In 

Eng.  In 

Eng.  In 

68 

0.0024 

0.443 

35.7 

0.436 

34.6 

0.430 

33.5 

0.423 

32.5 

0.416 

31.4 

0.409 

30.4 

69 

.0025 

0.467 

36.4 

0.460 

35.3 

0.453 

34.2 

0.446 

33.2 

0.440 

32.2 

0.433 

31.2 

70 

.00-25 

0.491 

37.1 

0.484 

36.0 

0.477 

35.0 

0.471 

33.9 

0.464 

32.9 

0.457 

31.9 

'    71 

.0026 

0.516 

37.8 

0.509 

36.7 

0.502 

35.7 

0.496 

34.6 

0.489 

33.6 

0.482 

32.7 

72 

0.542 

38.5 

0.535 

37.4 

0.528 

36.3 

0.522 

35.3 

0.515 

34.3 

0.508 

33.4 

.0026 

1 

73 

.0027 

0.569 

39.1 

0.562 

38.0 

0.555 

37.0 

0.548 

36.0 

0.542 

35.0 

0.535 

34.0    ! 

74 

.0028 

0.596 

39.7 

0.589 

38.7 

0.583 

37.7 

0.576 

36.6 

0.569 

35.7 

0.562 

34.7 

75 

.0029 

0.624 

40.3 

0.618 

39.3 

0.611 

38.3 

0.604 

37.3 

0.597 

36.3 

0.591 

35.3 

76 

-.0030 

0.654 

40.9 

0.647 

39.9 

0.640 

38.9 

0.633 

37.9 

0.627 

36.9 

0.620 

35.9 

77 

0.683 

41.5 

0.677 

40.5 

0.670 

39.5 

0.663 

38.5 

0.656 

37.5 

0.650 

36.5 

.0031 

78 

0.714 

42.1 

0.707 

41.0 

0.701 

40.0 

0.694 

39.0 

0.687 

38.1 

0.680 

37.1 

.0032 

79 

.0033 

0.746 

42.6 

0.739 

41.6 

0.732 

40.6 

0.726 

39.6 

0.719 

38.6 

0.712 

37.7 

80 

.0034 

0.779 

43.2 

0.772 

42.1 

0.765 

41.1 

0.758 

40.2 

0.752 

39.2 

0.745 

38.3 

81 

0.813 

43.7 

0.806 

42.7 

0.799 

41.7 

0.792 

40.7 

0.785 

39.7 

0.779 

38.8 

82 

.0035 

0.847 

44.2 

0.840 

43.2 

0.834 

42.2 

0.827 

41.2 

0.820 

40.2 

0.813 

39.4 

.0036 

83 

0.883 

44.7 

0.876 

43.7 

0.869 

42.7 

0.863 

41.7 

0.856 

40.7 

0.849 

39.9 

84 

'   .0036 

0.920 

45.2 

0.913 

44.2 

0.906 

43.2 

0.899 

42.2 

0.893 

41.3 

0.886 

40.4 

85 

.0038 

0.958 

45.6 

0.951 

44.6 

0.944 

43.7 

0.937 

42.7 

0.930 

41.8 

0.923 

40.9 

86 

.0039 

0.996 

46.1 

0.989 

45.1 

0.983 

44.1 

0.976 

43.2 

0.969 

42.3 

0.962 

41.3 

87 

.0040 

1.037 

46.5 

1.030 

45.6 

1.023 

44.6 

1.017 

43.6 

1.010 

42.7 

1.003 

41^8 

.0041 

88 

1.077 

47.0 

1.070 

46.0 

1.064 

45.0 

1.057 

44.1 

1.050 

43.2 

1.043 

42.3 

89 

.0042 

1.119 

47.4 

1.113 

46.4 

1.106 

45.5 

1.099 

44.5 

1.092 

43.6 

1.085 

42.7 

90 

.0043 

1.163 

47.8 

1.156 

46.9 

1.149 

45.9 

1.142 

45.0 

1.136 

44.1 

1.129 

43.2 

91 

.0045 

1.208 

48.2 

1.201 

47.3 

1.194 

46.3 

1.187 

45.4 

1.180 

44.5 

1.173 

43.6 

92 

.0047 

1.254 

48.6 

1.247 

47.7 

1.240 

46.7 

1.233 

45.8 

1.226 

44.9 

1.219 

44.0 

.0048 

93 

1.301 

49.0 

1.294 

48.1 

1.287 

47-1 

1.280 

46.2 

1.273 

45.3 

1.266 

44.4 

94 

.0049 

1.349 

49.4 

1.342 

48.4 

1.335 

47.5 

1.329 

46.6 

1.322 

45.7 

1.315 

44.8 

95 

.0050 

1.399 

49.8 

1.392 

48.8 

1.385 

47.9 

1.378 

47.0 

1.371 

46.1 

1.364 

45.2 

96 

.0051 

.450 

50.1 

1.443 

49.2 

1.436 

48.3 

1.429 

47.3 

1.422 

46.5 

1.415 

45.6 

97 

.0053 

.502 

50.5 

1.495 

49.5 

1.489 

48.6 

1.482 

47.7 

1.475 

46.8 

1.468 

46.0 

98 

.0054 

.556 

50.8 

1.549 

49.9 

1.543 

49.0 

1.536 

48.1 

1.529 

47.2 

1.522 

46.3 

.0055 

99 

.612 

51.2 

1.605 

50.2 

1.598 

49.3 

1.5911 

48.4 

1.584 

47.5 

1.577 

46.7 

100 

.0057 

.669 

51.5 

1.662 

50.6 

1.655 

49.7 

1.648 

48.8 

1.641 

47.9 

1.634 

47.0 

101 

.0058 

.727 

51.8 

1.720 

50.9 

1.713 

50.0 

1.706 

49.1 

1.700 

48.2 

1.693 

47.4 

102 

.0060 

1.787 

52.2 

1.780 

51.2 

1.773 

50.3 

1.766 

49.4 

1.759 

48.6 

1.753 

47.7 

103 

.0062 

1.849 

52.5 

1.842 

51.5 

1.835 

50.7 

1.828 

49.8 

1.821 

48.9 

1.814 

48.0 

104 

.0063 

1.912 

52.8 

1.905 

51.9 

1.898 

51.0 

1.891 

50.1 

1.884 

49.2 

1.877 

48.4 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

67 


19  PSYCHROMETRICAL    TABLES. 

Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —  Relative  Humidity  in  Hundredths. 


Wet- 

t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Bulb 
Thermo- 
meter 

t' 

Vertical 
Difference 
of  Force 
of  Vapor 

21°.0 

21°.5 

22°.0 

22°.5 

23°.O 

23°.5 

Fahren- 
heit. 

for  each 
0°.l. 

Force  of 
Vapot. 

Rela- 
tive 
Hu- 
mid- 

Force of 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force o 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force o 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force  o 
Vapor. 

Rela- 
tive 
Hu- 
mid- 

Force ol 
Vapor. 

1  Rela- 
J    tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In 

Eng.  In 

Eng.  In 

Eng.  In 

Eng.  In 

Eng.  In 

32 

33 

34 

35 

• 

36 

37 

38 

39 

40 

41 

42 

43 

44 

0.013 

2.0 

45 

0.0011 

0.023 

3.7 

0.017 

2.6 

0.010 

1.6 

46 

.0011 

0.035 

5.2 

0.028 

4.£ 

0.022 

3.1 

0.015 

2.1 

.0012 

47 

0.046 

6.8 

0.040 

5.7 

0.033 

4.7 

0.027 

3.7 

0.020 

2.7 

0.013 

1.8 

48 

.0012 

0.058 

8.2 

0.052 

7.2 

0.045 

6.2 

0.039 

5.2 

0.032 

4.2 

0.025 

3.3 

49 

.0013 

0.071 

9.7 

0.064 

8.6 

0.058 

7.6 

0.051 

6.6 

0.044 

5.7 

0.038 

4.7 

50 

.0013 

0.084 

11.0 

0.077 

10.0 

0.070 

9.0 

0.064 

8.0 

0.057 

7.1 

0.051 

6.1 

51 

.0013 

0.097 

12.3 

0.090 

11.3 

0.084 

10.3 

0.077 

9.3 

0.070 

8.3 

0.064 

7.4 

.0014 

52 

0.110 

13.5 

0.104 

12.5 

0.097 

11.5 

0.091 

10.6 

0.084 

9.6 

0.077 

8.7 

53 

.0014 

0.125 

14.8 

0.118 

13.7 

0.111 

12.8 

0.105 

11.8 

0.098 

10.9 

0.092 

9.9 

54 

.0015 

0.139 

16.0 

0.133 

14.9 

0.126 

14.0 

0.120 

13.0 

0.113 

12.1 

0.106 

11.2 

55 

.0015 

0.155 

17.1 

0.148 

16.1 

0.141 

15.1 

0.135 

14.2 

0.128 

13.3 

0.121 

12.4 

56 

.0016 

0.170 

18.2 

0.164 

17.2 

0.157 

16.3 

0.150 

15.3 

0.144 

14.4 

0.137 

13.5 

.0016 

57 

0.186 

19.4 

0.180 

18.4 

0.173 

17.4 

0.167 

16.5 

0.160 

15.6 

0.153 

14.7 

58 

.0017 

0.203 

20.5 

0.197 

19.5 

0.190 

18.5 

0.183 

17.6 

0.177 

16.7 

0.170 

15.8 

59 

.0017 

0.220 

21.5 

0.214 

20.6 

0.207 

19.6 

0.200 

18.7 

0.194 

17.7 

0.187 

16.9 

60 

.0018 

0.238 

22.5 

0.231 

21.6 

0.225 

20.6 

0.218 

19.6 

0.211 

18.7 

0.205 

17.8 

61 

.0019 

0.256 

23.4 

0.250 

22.5 

0.243 

21.5 

0.236 

20.6 

0.230 

19.7 

0.223 

18.8 

.0019 

62 

0.275 

24.4 

0.269 

23.5 

0.262 

22.4 

0.255 

21.5 

0.249 

20.6 

0.242 

19.7 

63 

.0020 

0.295 

25.3 

0.288 

24.4 

0.282 

23.3 

0.275 

22.4 

0.268 

21.5 

0.262 

20.7 

64 

.0020 

0.315 

26.1 

0.309 

25.3 

0.302 

24.2 

0.295 

23.3 

0.289 

22.4 

0.282 

21.6 

65 

.0021 

0.336 

27.0 

0.330 

26.1 

0.323 

25.1 

0.316 

24.2 

0.309 

23.3 

0.303 

22.4 

66 

.0022 

0.358 

27.9 

0.351 

27.0 

0.344 

26.0 

0.338 

25.1 

0.331 

24.2 

0.324 

23.3 

67 

.0023 

0.380 

28.7 

0.373 

27.8 

0.367 

26.8 

0.360 

25.9 

0.353 

25.0 

0.346 

24.2 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


68 


PSYCHROMETRICAL    TABLES.  20 

Temperature,  Fahrenheit.  —Force  of  Vapor  in  English  Inches.  —  Relative  Humidity  in  Hundredths. 


t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Wet- 
Bulb 
Thermo 

Mean 
Vertical 
Difference 

21°.O 

21°.5 

22°.O 

22°.5 

23°.0 

23°.5 

meter 

•if 

of  Force 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

0°.l. 

tive 

tive 

t.ivp. 

t 

tive 

tive 

tive 

Force  of 

Hu- 

Force of 

Hu- 

Force of    HU- 

Force  of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor.    mia. 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In.! 

Eng.  In. 

Eng.  In. 

Eng.  In. 

68 

0.403 

29.5 

0.396 

28.5 

0.389 

27.6 

0.383 

26.7 

0.376 

25.8 

0.369 

25.0 

69 

0.0024 

0.426 

30.2 

0.420 

29.3 

0.413 

28.4 

0.406 

27.5 

0.399 

26.6 

0.393 

25.8 

70 

.0024 

0.451 

31.0 

0.444 

30.1 

0.437 

29.1 

0.430 

28.2 

0.424 

27.4 

0.417 

26.5 

71 

.0025 

0.476 

31.7 

0.469 

30.8 

0.462 

29.9 

0.455 

29.0 

0.449 

28.1 

0.442 

27.3 

72 

.0026 

0.501 

32.4 

0.495 

31.5 

0.488 

30.6 

0.481 

29.7 

0.475 

28.8 

0.468 

28.0 

.0027 

73 

0.528 

33.1 

0.521 

32.2 

0.515 

31.3 

0.508 

30.4 

0.501 

29.5 

0.494 

28.7 

74 

.0028 

0.556 

33.8 

0.549 

32.8 

0.542 

31.9 

0.535 

31.1 

0.529 

30.2 

0.522 

29.4 

75 

.0028 

0.584 

34.4 

0.577 

33.5 

0.570 

32.6 

0.564 

31.7 

0.557 

30.9 

0.550 

30.0 

76 

.0029 

0.613 

35.0 

0.606 

34.1 

0.599 

33.2 

0.593 

32.3 

0.586 

31.5 

0.579 

30.7 

77 

.0030 

0.643 

35.6 

0.636 

34.7 

0.629 

33.8 

0.623 

33.0 

0.616 

32.1 

0.609 

31.3 

.0031 

78 

0.674 

36.2 

0.667 

35.3 

0.660 

34.4 

0.653 

33.6 

0.647 

32.7 

0.640 

31.9 

79 

.0032 

0.705 

36.8 

0.699 

35.9 

0.692 

35.0 

0.685 

34.2 

0.678 

33.3 

0.671 

32.5 

80 

.0033 

0.738 

37.4 

0.731 

36.5 

0.724 

35.6 

0.718 

34.7 

0.711 

33.9 

0.704 

33.1 

81 

.0034 

0.772 

37.9 

0.765 

37.0 

0.758 

36.1 

0.751 

35.3 

0.745 

34.5 

0.738 

33.5 

82 

.0035 

0.806 

38.4 

0.800 

37.6 

0.793 

36.7 

0.786 

35.8 

0.779 

35.0 

0.772 

34.2 

.0036 

83 

0.842 

39.0 

0.835 

38.1 

0.829 

37.2 

0.822 

36.4 

0.815 

35.5 

0.808 

34.7 

84 

.0037 

0.879 

39.5 

0.872 

38.6 

0.865 

37.7 

0.858 

36.9 

0.852 

36.1 

0.845 

35.2 

85 

.0038 

0.917 

40.0 

0.910 

39,1 

0.903 

38.2 

0.896 

37.4 

0.889 

36.6 

0.882 

35.8 

86 

.0039 

0.955 

40.4 

0.948 

39.6 

0.942 

38.7 

0.935 

37.9 

0.928 

37.1 

0.921 

36.3 

87 

.0040 

0.995 

40.9 

0.988 

40.1 

0.981 

39.2 

0.975 

38.4 

0.968 

37.5 

0.961 

36.7 

.0041 

88 

1.036 

41.4 

1.029 

40.5 

1.022 

39.7 

.016 

38.8 

.009 

38.0 

1.002 

37.2 

89 

.0042 

1.078 

41.8 

1.071 

41.0 

1.065 

40.1 

.058 

39.3 

.051 

38.5 

1.044 

37.7 

90 

.0044 

1.122 

42.3 

1.115 

41.4 

1.108 

40.6 

.101 

39.7 

.094 

38.9 

1.088 

38.1 

91 

.0045 

1.166 

42.7 

1.160 

41.9 

1.153 

41.0 

.146 

40.2 

.139 

39.4 

1.132 

38.6 

92 

.0046 

1.212 

43.1 

1.206 

42.3 

1.199 

41.4 

.192 

40.6 

.185 

39.8 

1.178 

39.0 

.0048 

93 

1.260 

43.5 

1.253 

42.7 

1.246 

41.9 

.239 

41.0 

.232 

40.2 

1.225 

39.4 

94 

.0049 

1.308 

43.9 

1.301 

43.1 

1.294 

42.3 

.287 

41.4 

.280 

40.6 

1.274 

39.9 

95 

.0050 

1.358 

44.3 

1.351 

43.5 

1.344 

42.7 

.337 

41.8 

.330 

41.0 

1.323 

40.3 

96 

.0051 

1.408 

44.7 

1.402 

43.9 

1.395 

43.0 

.388 

42.2 

.381 

41.4 

1.374 

40.7 

97 

.0053 

1.461 

45.1 

1.454 

44.3 

1.447 

43.4 

.440 

42.6 

.433 

41.8 

1.426 

41.1 

98 

.0054 

1.515 

45.5 

1.508 

44.6 

1.501 

43.8 

.494 

43.0 

.487 

42.2 

1.480 

41.4 

.0056 

99 

1.570 

45.8 

1.563 

45.0 

1.556 

44.2 

.550 

43.4 

.543 

42.6 

1.536 

41.8 

100 

.0057 

1.627 

46.2 

1.620 

45.4 

1.613 

44.5 

.607 

43.7 

.600 

43.0 

1.593 

42.2 

101 

.0059 

1.686 

46.5 

1.679 

45.7 

1.672 

44.9 

.665 

44.1 

.658 

43.3 

1.651 

42.5 

102 

.0060 

1.746 

46.8 

1.739 

46.0 

1.732 

45.2 

.725 

44.4 

.718 

43.7 

1.711 

42.9 

103 

.0062 

1.807 

47.2 

1.800 

46.4 

1.793 

45.6 

1.786 

44.8 

.779 

44.0 

1.772 

43.2 

104 

.0063 

1.870 

47.5 

1.863 

46.7 

1.856 

45.9 

1.849 

45.1 

.842 

44.3 

1.S35 

43.6 

Mean  Horizontal  Difference  of  Force  of  Yapor  for  each  0°.l  =  0.0013. 

B 


69 


21  PSYCHROMETRICAL    TABLES. 

Temperature,  Fahrenheit.  —  Force  of  Vapor  in  English  Inches.  —Relative  Humidity  in  Hundredths. 


Wet- 

t  —  t',  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

Bulb 
Thermo 

Vertical 
Difference 

meter 

of  Force 

-*'*  «W 

* 

* 

•*      •** 

t£\)    »\f 

/«O    «t> 

of  Vapor 

Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

Force  of 
Vapor. 

tive 
Hu- 
mid- 

Force o 
Vapor. 

tive 
Hu- 
mid- 

Force o 
Vapor. 

tive 
Hu- 
mid- 

Force o 
Vapor. 

tive 
Hu- 
mid- 

Force ol 
Vapor. 

tive 
Hu- 
mid- 

Force o 
Vapor. 

tive 
Hu- 
mid- 

ity. 

ity. 

ity. 

ity. 

ity. 

ity. 

0 

Eng.  In. 

Eng.  In 

Eng.  In 

Eng.  In 

Eng.  In 

Eng.  In 

32 

33 

31 

35 

36 

i 

37 

38 

39 

40 

41 

42 

43 

44 

45 

46 

47 

48 

0.019 

2.4 

0.012 

1.5 

0.0013 

49 

0.031 

3.9 

0.025 

3.0 

0.018 

2.2 

0.011 

1.3 

50 

.0013 

0.044 

5.2 

0.037 

4.4 

0.031 

3.6 

0.024 

2.7 

0.018 

2.0 

0.011 

1.2 

.00  13 

51 

0.057 

6.5 

0.051 

5.7 

0.044 

4.9 

0.037 

4.1 

0.031 

3.3 

0.024 

2.5 

.0014 

52 

0.071 

7.8 

0.064 

7.0 

0.058 

6.1 

0.051 

5.3 

0.044 

4.6 

0.038 

3.8 

53 

.0014 

0.085 

9.1 

0.078 

8.2 

0.072 

7.4 

0.065 

6.6 

0.058 

5.8 

0.052 

5.1 

54 

.0015 

0.100 

10.3 

0.093 

9.4 

0.086 

8.6 

0.080 

7.8 

0.073 

7.0 

0.067 

6.3 

.0015 

55 

0.115 

11.5 

0.108 

10.6 

0.102 

9.8 

0.095 

9.0 

0.088 

8.2 

0.082 

7.5 

56 

.0016 

0.130 

12.7 

0.124 

11.8 

0.117 

11.0 

0.111 

10.2 

0.104 

9.4 

0.097 

8.7 

.00l8 

57 

0.147 

13.8 

0.140 

13.0 

0.133 

12.1 

0.127 

11.3 

0.120 

10.6 

0.113 

9.8 

58 

.0017 

0.163 

14.9 

0.157 

14.1 

0.150 

13.2 

0.143 

12.5 

0.137 

11.7 

0.130 

10.9 

59 

.0017 

0.180 

16.0 

0.174 

15.2 

0.167 

14.3 

0.161 

13.6 

0.154 

12.8 

0.147 

12.0 

60 

.0018 

0.198 

17.0 

0.191 

16.1 

0.185 

15.3 

0.178 

14.6 

0.172 

13.8 

0.165 

13.0 

61 

.0019 

0.216 

17.9 

0.210 

17.1 

0.203 

16.3 

0.196 

15.5 

0.190 

14.7 

0.183 

14.0 

.0019 

62 

0.235 

18.9 

0.229 

18.1 

0.222 

17.2 

0.215 

16.5 

0.209 

15.7 

0.202 

15.0 

63 

.0020 

0.255 

19.8 

0.248 

19.0 

0.242 

18.2 

0.235 

17.4 

0.228 

16.6 

0.222 

15.9 

64 

.0020 

0.275 

20.7 

0.269 

19.9 

0.262 

19.1 

0.255 

18.3 

0.248 

17.5 

0.242 

16.8 

65 

.0021 

0.296 

21.6 

0.289 

20.8 

0.283 

20.0 

0.276 

19.2 

0.269 

18.4 

0.263 

17.7 

66 

.0022 

0.318 

22.5 

0.311 

21.7 

0.304 

20.9 

0.297 

20.1 

0.291 

19.3 

0.284 

18.6 

67 

.0023 

0.340 

23.3 

0.333 

22.5 

0.326 

21.7 

0.320 

20.9 

0.313 

20.2 

0.306 

19.4 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


70 


PSYCHROMETRICAL    TABLES.  22 

Temperature,  Fahrenheit.  — Force  of  Vapor  in  English  Inches.  — Relative  Humidity  in  Hundredths. 


YTr_* 

Mean 

t  —  1;,  or  Difference  of  Wet  and  Dry  Bulb  Thermometers. 

\V  6t- 

Bulb 
Thermo- 

Vertical 
Mfference 

24°.0 

24°.5 

25°.0 

25°.5 

26°.0 

26°.5 

meter 

*J 

of  Force 
of  Vapor 

•  Fahren- 

for each 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

Rela- 

heit. 

0°.l. 

tive 

tive 

tive 

tive 

tive 

tive 

Force  of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu- 

Force of 

Hu_    Force  of 

Hu- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

Vapor. 

mid- 

ity. 

ity. 

ity. 

ity. 

ity- 

ity. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng  In. 

68 

0.0024 

0.363 

24.2 

0.356 

23.3 

0.349 

22.5 

0.342 

21.8 

0.336 

21.8 

0.329 

20.3 

69 

.0024 

0.386 

24.9 

0.379 

24.1 

0.373 

23.3 

0.366 

22.6 

0.359 

21.8 

0.352 

21.1 

70 

.0025 

0.410 

25.7 

0.403 

24.9 

0.397 

24.1 

0.390 

23.3 

0.3S3 

22.6 

0.377 

21.9 

71 

.0026 

0.435 

26.4 

0.428 

25.6 

0.422 

24.9 

0.415 

24.1 

0.408 

23.3 

0.402 

22.6 

72 

0.461 

27.2 

0.454 

26.4 

0.448 

25.6 

0.441 

24.8 

0.434 

24.1 

0.427 

23.3 

.0027 

73 

.0028 

0.488 

27.9 

0.481 

27.1 

0.474 

26.3 

0.467 

25.5 

0.461 

24.8 

0.454 

24.0 

74 

.0023 

0.515 

28.5 

0.508 

27.7 

0.502 

27.0 

0.495 

26.2 

0.488 

25.5 

0.481 

24.7 

75 

.0029 

0.543 

29.2 

0.537 

28.4 

0.530 

27.6 

0.523 

26.8 

0.516 

26.1 

0.510 

25.4 

76 

.0030 

0.572 

29.8 

0.566 

29.1 

0.559 

28.3 

0.552 

27.4 

0.545 

26.8 

0.539 

26.1 

77 

0.602 

30.5 

0.595 

29.7 

0.589 

28.9 

0.582 

28.0 

0.575 

27.4 

0.568 

26.7 

.0031 

78 

.0032 

0.633 

31.1 

0.626 

30.3 

0.619 

29.5 

0.613 

28.7 

0.606 

28.0 

0.599 

27.3 

79 

.0033 

0.665 

31.7 

0.658 

30.9 

0.651 

30.1 

0.644 

29.3 

0.638 

28.6 

0.631 

27.9 

80 

.0034 

0.697 

32.3 

0.691 

31.5 

0.684 

30.7 

0.677 

29.9 

0.670 

29.2 

0.663 

28.5 

81 

.0035 

0.731 

32.8 

0.724 

32.1 

0.717 

31.3 

0.711 

30.5 

0.704 

29.8 

0.697 

29.1 

82 

0.766 

33.4 

0.759 

32.6 

0.752 

31.8 

0.745 

31.0 

0.738 

30.4 

0.732 

29.7 

83 

.0036 

0.801 

33.9 

0.795 

33.2 

0.788 

32.4 

0.781 

31.6 

0.774 

30.9 

0.767 

30.2 

84 

.0037 

0.833 

34.5 

0.831 

33.7 

0.824 

32.9 

0.818 

32.1 

0.811 

31.5 

0.804 

30.7 

85 

.0038 

0.876 

35.0 

0.869 

34.2 

0.862 

33.4 

0.855 

32.7 

0.848 

32.0 

0.842 

31.3 

86 

.0039 

0.914 

35.5 

0.908 

34.7 

0.901 

33.9 

0.894 

33.2 

0.887 

32.5 

0.880 

31.8 

87 

.0040 

0.954 

36.0 

0.947 

35.2 

0.940 

34.4 

0.934 

33.7 

0.927 

33.0 

0.920 

32.3 

.0041 

88 

0.995 

36.4 

0.988 

35.7 

0.981 

34.9 

0.975 

34.2 

0.968 

33.5 

0.961 

32.8 

89 

.0042 

1.037 

36.9 

1.030 

36.1 

1.024 

35.4 

1.017 

34.7 

.010 

33.9 

1.003 

33.2 

90 

.0044 

1.081 

37.4 

1.074 

36.6 

1.067 

35.8 

1.060 

35.1 

.053 

34.4 

1.046 

33.7 

91 

.0045 

1.125 

37.8 

1.118 

37.1 

.112 

36.3 

1.105 

35.6 

.098 

34.9 

1.091 

34.2 

92 

.0046 

1.171 

38.2 

1.164 

37.5 

.157 

36.7 

1.151 

36.0 

.144 

35.3 

1.137 

34.6 

.0048 

93 

1.218 

38.7 

1.211 

37.9 

.205 

37.1 

1.198 

36.5 

.191 

35.7 

1.184 

35.0 

94 

.0049 

1.267 

39.1 

1.260 

38.3 

.253 

37.5 

1.246 

36.9 

.239 

36.2 

1.232 

35.5 

95 

.0050 

1.316 

39.5 

1.309 

38.7 

.302 

37.9 

1.296 

37.3 

.289 

36.6 

1.282 

35.9 

96 

.0051 

1.367 

39.9 

1.360 

39.1 

.353 

38-3 

1.346 

37.7 

.340 

37.0 

1.333 

36.3 

97 

.0053 

1.420 

40.3 

1.413 

39.5 

.406 

38.7 

1.399 

38.1 

.392 

37.4 

1.385 

36.7 

98 

.0054 

1.473 

40.7 

1.467 

39.9 

.460 

39.1 

1.453 

38.5 

.446 

37.8 

1.439 

37.1 

.0056 

99 

1.529 

41.1 

1.522 

40.3 

.515 

39.5 

1.508 

38.9 

1.501 

38.2 

1.494 

37.5 

100 

.0057 

1.586 

41.4 

1.579 

40.7 

.572 

39.9 

1.565 

39.2 

1.558 

38.5 

1.551 

37.9 

101 

.0059 

1.644 

41.8 

1.637 

41.0 

.630 

40.3 

1.623 

39.6 

1.616 

38.9 

1.609 

38.2 

102 

.0060 

1.704 

42.2 

1.697 

41.4 

.690 

40.7 

1.683 

40.0 

1.676 

39.3 

1.669 

3S.6 

103 

.0062 

1.765 

42.5 

1.758 

41.8 

.751 

41.0 

1.745 

40.3 

1.738 

39.6 

1.731 

38.9 

104 

.0063 

1.828 

42.8 

1.821 

42.1 

.814 

41.4 

1.807 

40.7 

1.800 

40.0 

1.793 

39.3 

Mean  Horizontal  Difference  of  Force  of  Vapor  for  each  0°.l  =  0.0013. 

B 


71 


PSYCHROMETRICAL    TABLES. 
Correction  for  Barometrical  Height  above  or  below  the  Normal  Height  of  29.7  inches. 


Difference  of  Thermometers,  or  t  —  t'  Fahrenheit. 

For 

Baromet- 
rical 

Height. 

2° 

40 

6° 

8° 

1O° 

Igo 

14° 

16° 

18° 

2O° 

22° 

24° 

26° 

Wet  Bulb  above  the  Freezing-Point. 

Eng.  In. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

81.0 

-.001 

-.002 

-.003 

-.005 

-.006 

-.007 

-.008 

-.009 

-.010 

-.012 

-.013 

-.014 

-.015 

30.5 

.001 

.001 

.002 

.003 

.004 

.004 

.005 

.006 

.006 

.007 

.008 

.009 

.009 

30.0 

-.000 

-.000 

-.001 

-.001 

-.001 

-.002 

-.002 

-.002 

-.002 

-.003 

-.003 

-.003 

-.004 

29.5 

+.000 

+.000 

+.001 

+.001 

+.001 

+.001 

+.001 

+.001 

+.002 

+.002 

+.002 

+.002 

+.002 

29.0 

.001 

.001 

.002 

.003 

.003 

.004 

.004 

.005 

.006 

.006 

.007 

.008 

.008 

28.5 

.001 

.002 

.003 

.004 

.005 

.006 

.007 

.009 

.010 

.011 

.012 

.013 

.014 

28.0 

.001 

.003 

.005 

.006 

.008 

.009 

.011 

.012 

.014 

.015 

.017 

.018 

.020 

27.5 

.002 

.004 

.006 

.007 

.010 

.012 

.014 

.016 

.018 

.020 

.022 

.024 

.026  i 

27.0 

.002 

.005 

.007 

.009 

012 

.014 

.017 

.019 

.022 

.024 

.027 

.029 

.031   j 

26.5 

.003 

.006 

.008 

.011 

.014 

.017 

.020 

.023 

.026 

.029 

.031 

.034 

.037 

26.0 

.003 

.006 

.010 

.013 

.016 

.020 

.023 

.026 

.030 

.033 

.036 

.040 

.043 

25.5 

.004 

.007 

.011 

.014 

.019 

.022 

.025 

.030 

.034 

.037 

.041 

.045 

.049 

25.0 

.004 

.008 

.012 

.016 

.021 

.025 

.028 

.033 

.038 

.042 

.046 

.050 

.055 

24.0 

.005 

.010 

.015 

.020 

.025 

.030 

.034 

.040 

.046 

.051 

.056 

.061 

.066 

23.0 

.006 

.012 

.018 

.023 

.030 

.035 

.041 

.047 

.054 

.060 

.066 

.072 

.078 

22.0 

.007 

.013 

.020 

.027 

.034 

.041 

.047 

.054 

.062 

.069 

.076 

.083 

.090 

21.0 

.008 

.015 

.023 

.030 

.038 

.046 

.053 

.062 

.070 

.077 

.085 

.093 

.101 

20.0 

+.008 

+.017 

+  .026 

+.034 

+.043 

+.051 

+.059 

+.069 

+.078 

+.086 

+.095 

+.104 

+  .113 

Wet  Bulb  below  the 
Freezing-Point. 

EXAMPLE   OF  CALCULATION. 

31.0 

-.001 

-.002 

-.003 

-.004 

-.006 

Wet  Bulb  above  the  Freezing-Point. 

30.5 

.001 

.001 

.002 

.003 

.003 

f  =  62°  E.     t  —  t'  =  10°.    Barom.  =  26.5  in. 

30.0 

-.000 

-.000 

-.001 

-.001 

-.001 

The  large  tables  give  for  a  mean  baro- 

29.5 

+.000 

+.000 

+.000 

+.001 

+.001 

metrical  height  of  27.9  inches.    Eorce  of         inch, 

29.0 

.001 

.001 

.002 

.002 

.003 

Vapor        =  0.403 

28.5 

.001 

.002 

.003 

.004 

.005 

Additive  correction,  in  this  table,  for 

B  =  26.5  inches,  and  10°                             =  0.014 

28.0 
27.5 

.001 
.002 

.003 
.003 

.004 
.005 

.005 
.007 

.007 
.009 

Corrected  Eorce  of  Vapor        .      =  0.417 

27.0 
26.5 

.002 
.002 

.004 
.005 

.006 
.007 

.008 
.010 

.011 
.013 

The  mean  barometrical  pressure,  at  a  given  place 
of  observation,  being  known,  the  above  Psychro- 

26.0 

.003 

.006 

.009 

.012 

.014 

metrical  Tables  may  be  fitted  for  that  place,  by 

25.5 

.003 

.007 

.010 

.013 

.016 

determining,  by  means  of  this  table,  a  constant  cor- 

rection, to  be  applied  to  the  numbers  in  the  tables, 

25.0 

.003 

.007 

.011 

.015 

.018 

expressing  the  force  of  vapor.    This  correction  will 

24.0 

.004 

.009 

.013 

.018 

.022 

be  found  by  taking  for  t  —  t',  or  the  difference  of 

23.0 

.005 

.010 

.016 

.021 

.026 

thermometers,  a  mean  value,  representing  the  mean 

22.0 

.006 

.012 

.018 

.024 

.030 

moisture  of  the  air.     The  errors  arising  from  the 

21.0 

.006 

.014 

.020 

.027 

.034 

deviations  from  that  mean  will  little  impair  the 

20.0 

+.007 

+.015 

+.023 

+.030 

+.038 

accuracy  of  the  results. 

B 


TABLE    VIII. 


FOR    DEDUCING   THE    RELATIVE    HUMIDITY   OF    THE    AIR   FROM    THE    INDICATIONS,    IN 
ENGLISH    MEASURES,    OF    THE    DEW-POINT    INSTRUMENTS. 


THE  object  of  every  Dew-Point  instrument  is  to  ascertain,  by  causing  a  part  of  the 
apparatus  to  cool,  the  temperature  at  which  the  vapor  contained  in  the  air  begins  to 
condense,  in  the  shape  of  light  dew,  on  the  cooled  portion  of  the  instrument.  It  is 
obvious  that  this  is  the  temperature  at  which  the  atmosphere  itself,  if  cooled  likewise, 
would  be  fully  saturated  by  the  amount  of  vapor  present  in  the  air  at  the  time  of  the 
observation. 

The  temperature  of  the  dew-point  being  known,  all  the  hygrometrical  conditions 
of  the  air  can  be  easily  deduced  from  it. 

The  Absolute  Humidity,  or  the  total  amount  of  vapor  in  the  atmosphere,  is  ex- 
pressed by  the  number,  in  the  Tables  of  Elastic  Forces  of  Vapor,  due  to  that  temper- 
ature. 

The  Relative  Humidity,  or  the  degree  of  moisture,  being  the  ratio  of  the  quantity 
of  vapor  actually  contained  in  the  air  to  the  quantity  it  could  contain  if  fully  saturated, 
is  expressed  by  the  proportion 

Relative  Humidity  :   1  :  :  Force  of  Vapor  at  Dew-Point  :  Maximum  Force  of  Vapor. 

Calling  the 

Force  of  Vapor  at  the  Temperature  of  the  Dew-Point,  f\ 

Force  of  Vapor  at  the  Temperature  of  the  Air,  F  ; 
then 

Relative  Humidity  =  £. 

It  is  thus  found  by  dividing  the  force  of  vapor  due,  in  the  Table  of  Elastic  Forces, 
to  the  temperature  of  the  dew-point,  by  the  maximum  of  the  force  of  vapor  due,  in 
the  same  table,  to  the  temperature  of  the  air  at  the  time  of  the  observation.  F  being 
always  greater  than  /,  when  the  air  is  not  saturated,  the  Relative  Humidity  is  ex- 
pressed by  a  fraction,  which  is  termed  the  fraction  of  saturation.  Making  the  point 
of  saturation  =  100,  in  order  to  obtain  this  fraction  in  hundredths,  we  have 

Relative  Humidity  =  f-^. 
B  73 


FOR  DEDUCING  THE  RELATIVE  HUMIDITY  OF  THE  AIR. 

Example. 
Suppose  the 

Temperature  of  the  Air,  or  t,  to  be  =  43°  F. 

Temperature  of  the  Dew-Point,  or  t',  to  be  =  35°  F. 

Difference  between  the  two,  or  t  —  t',  to  be  =    8°  F. 
Taking  in  Table  VI.  the  Elastic  Forces  due  to  t  and  t7,  we  have 


=  ^r5  =  73'4>  ReIatiTO  Humi<%  in  Hundredths. 

The  following  Table  VIII.  gives,  in  hundredths,  the  fraction  of  saturation,  or  Rel- 
ative Humidity,  corresponding  to  each  degree  of  f,  or  of  the  temperature  of  the  air, 
from  0°  to  104°  ;  and  for  every  half  degree  of  t  —  t',  or  of  the  difference  between 
the  temperature  of  the  air  and  of  the  dew-point,  from  0.°5  to  24.°5.  Regnault's  Table 
of  Elastic  Forces  of  Vapor,  reduced  to  English  measures,  has  been  used  in  the 
computation. 

Though  the  fraction  of  saturation  expressed  in  hundredths  indicates  the  Relative 
Humidity  with  sufficient  accuracy,  the  thousandths  have  been  added  to  facilitate,  as 
remarked  above  in  the  preface  to  the  Psychrometrical  Tables,  the  interpolations  for 
any  number  falling  between  those  given  in  the  table. 

USE  OF  THE  TABLE. 
Example. 

Temperature  of  Air,  or  t,  being  =  62°  F. 

Temperature  of  the  Dew-Point,  or  t',  =  53°  F. 

Difference,  or  t  —  t',  =    9°  F. 
Find  out  the  Relative  Humidity. 

In  the  column  of  temperatures,  the  first  on  the  left,  find  62°  ;  on  the  same  horizon- 
tal line,  in  the  column  headed  9°,  is  found  72.4,  which  is  the  Relative  Humidity 
required. 

Should  it  seem  desirable  to  compute  the  Relative  Humidity  for  values  of  t  —  V 
not  contained  in  the  table,  the  factors  given  below  in  Table  IX.  may  be  used.  It 
may  be  seen,  however,  that  an  interpolation  at  sight  will  always  suffice  for  meteo- 
rological purposes. 


B  74 


VIII. 


FOR    DEDUCING  THE    RELATIVE   HUMIDITY  OF  THE  AIR, 


FROM   THE    INDICATIONS    OF    DEW-POINT   INSTRUMENTS. 


Relative  Humidity  expressed  in  Hundredths,  full  Saturation  being  =  100. 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

t  —  t'  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.  —  Fahrenheit. 

0.0 

O.5 

l.O 

1.5 

2.0 

2.5 

3.O 

3.5 

4.O 

4.5 

0° 

100. 

97.7 

95.4 

93.2 

91.0 

88.9 

86.8 

84.8 

82.8 

80.9 

1 

100. 

97.7 

95.5 

93.3 

91.1 

89.0 

86.9 

84.9 

82.9 

81.0 

2 

100. 

97.7 

95.5 

93.3 

91.2 

89.1 

87.0 

85.0 

83.0 

81.1 

3 

100. 

97.8 

95.5 

93.4 

91.2 

89.2 

87.1 

85.1 

83.1 

81.2 

4 

100. 

97.8 

95.6 

93.4 

91.3 

89.2 

87.2 

85.2 

83.2 

81.3 

5 

100. 

97.8 

95.6 

93.5 

91.4 

89.3 

87.3 

85.3 

83.3 

81.4 

6 

100. 

97.8 

95.6 

93.5 

91.4 

89.3 

87.3 

85.3 

83.3 

81.5 

7 

100. 

97.8 

95.6 

93.5 

91.4 

89.3 

87.3 

85.3 

83.4 

81.5 

8 

100. 

97.8 

95.6 

93.5 

91.3 

89.3 

87.3 

85.3 

83.4 

81.5 

9 

100. 

97.8 

95.6 

93.5 

91.3 

89.3 

87.3 

85.3 

83.4 

81.5 

10 

100. 

97.8 

95.6 

93.4 

91.3 

89.3 

87.3 

85.3 

83.4 

81.5 

11 

100. 

97.8 

95.6 

93.4 

91.3 

89.3 

87.3 

85.3 

83.4 

81.6 

12 

100. 

97.8 

95.5 

93.4 

91.3 

89.3 

87.3 

85.4 

83.4 

81.6 

13 

100. 

97.8 

95.5 

93.4 

91.3 

89.3 

87.3 

85.4 

83.5 

81.6 

14 

100. 

97.7 

95.5 

93.4 

91.3 

89.3 

87.3 

85.4 

83.5 

81.7 

15 

100. 

97.7 

95.5 

93.4 

91.3 

89.4 

87.4 

85.5 

83.5 

81.7 

16 

100. 

97.7 

95.5 

93.4 

91.3 

89.3 

87.3 

85.4 

83.5 

81.6 

17 

100. 

97.7 

95.5 

93.4 

91.3 

89.3 

87.3 

85.3 

83.4 

81.6 

18 

100. 

97.7 

95.5 

93.4 

91.3 

89.3 

87.3 

85.3 

83.4 

81.5 

19 

100. 

97.8 

95.5 

93.4 

91.3 

89.3 

87.2 

85.2 

83.3 

81.4 

0.0 

0.5 

1.0 

1.5 

2.0    1    2.5 

3.0 

3.5 

4.0 

4.5 

B 


75 


RELATIVE    HUMIDITY    FROM    THE    TEMPERATURE    OF    THE    DEW-POINT. 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

t  —  t'  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.  —Fahrenheit. 

5.0 

5.5 

6.0 

6.5 

•7.0 

7.5 

S.O 

$.5 

9.0 

9.5 

0° 

79.0 

77.2 

75.4 

73.6 

71.9 

70.1 

68.5 

66.9 

65.3 

63.7 

1 

79.1 

77.3 

75.5 

73.7 

72.0 

70.2 

68.6 

67.0 

65.4 

63.8 

2 

79.2 

77.4 

75.6 

73.S 

72.1 

70.3 

68.7 

67.1 

65.5 

64.0 

3 

79.3 

77.5 

75.7 

73.9 

72.2 

70.5 

68.8 

67.2 

65.6 

64.1 

4 

79.4 

77.6 

75.8 

74.0 

72.3 

70.6 

68.9 

67.3 

65.7 

64.2 

5 

79.5 

77.7 

75.9 

74.1 

72.4 

70.7 

69.1 

67.4 

65.8 

64.4 

6 

79.6 

77.8 

'76.0 

74.2 

72.5 

70.8 

69.2 

67.6 

66.0 

64.5 

7 

79.6 

77.8 

76.0 

74.3 

72.6 

70.9 

69.3 

67.7 

66.1 

64.6 

8 

79.6 

77.9 

76.1 

74.4 

72.7 

71.0 

69.4 

67.8 

66.2 

64.7 

9 

79.7 

77.9 

76.1 

74.4 

72.7 

71.1 

69.5 

67.9 

66.3 

64.8 

10 

79.7 

77.9 

76.2 

74.5 

72.8 

71.2 

69.6 

68.0 

66.4 

64.9 

11 

79.7 

78.0 

76.2 

74.5 

72.8 

71.2 

69.6 

68.0 

66.5 

64.9 

12 

79.8 

78.0 

76.2 

74.5 

72.9 

71.2 

69.6 

68.0 

66.5 

65.0 

13 

79.8 

78.0 

76.3 

74.6 

72.9 

71.3 

69.6 

68.1 

66.5 

65.0 

14 

79.8 

78.1 

76.3 

74.6 

72.9 

71.3 

69.6 

68.1 

66.5 

65.1 

15 

79.8 

78.1 

76.3 

74.6 

72.9 

71.3 

69.7 

68.1 

66.6 

65.1 

16 

79.8 

78.0 

76.2 

74.5 

72.9 

71.2 

69.6 

68.1 

66.5 

65.1 

17 

79.7 

77.9 

76.1 

74.5 

72.8 

71.2 

69.6 

68.0 

66.5 

65.0 

18 

79.6 

77.8 

76.1 

74.4 

72.7 

71.1 

69.5 

68.0 

66.5 

65.0 

19 

0° 

79.6 

77.8 

76.0 

74.3 

72.7 

71.1 

69.5 

68.0 

66.4 

65.0 

10.0 

10.5 

11.0 

11.5 

12.0 

12.5 

13.0 

13.5 

14.0 

14.5 

62.1 

60.7 

59.2 

57.7 

56.3 

54.9 

53.6 

52.3 

51.0 

49.8 

1 

62.3 

60.8 

59.3 

57.9 

56.5 

55.1 

53.7 

52.5 

5J.2 

50.0 

2 

62.4 

61.0 

59.5 

58.1 

56.6 

55.3 

53.9 

52.7 

51.4 

50.1 

3 

62.6 

61.1 

59.6 

58.2 

56.8 

55.5 

54.1 

52.8 

51.5 

50.3 

4 

62.7 

61.3 

59.8 

58.4 

57.0 

55.7 

54.3 

53.0 

51.7 

50.5 

5 

62.9 

61.4 

60.0 

58.6 

57.2 

55.8 

54.5 

53.2 

51.9 

50.7 

6 

63.0 

61.5 

60.1 

58.7 

57.3 

55.9 

54.6 

53.3 

52.0 

50.8 

7 

63.1 

61.7 

60.2 

58.8 

57.4 

56.0 

54.7 

53.4 

52.1 

50.9 

8 

63.2 

61.8 

60.3 

58.9 

57.5 

56.2 

54.8 

53.5 

52.3 

51.0 

9 

63.3 

61.9 

60.4 

59.0 

57.6 

56.3 

54.9 

53.6 

52.4 

51.2 

10 

63.4 

62.1 

60.5 

59.1 

57.7 

56.4 

55.0 

53.8 

52.5 

51.3 

11 

63.5 

62.1 

60.6 

59.2 

57.8 

56.5 

55.1 

53.9 

52.6 

51.4 

12 

63.5 

62.1 

60.6 

59.3 

57.9 

56.6 

55.2 

54.0 

52.7 

51.5 

13 

63.5 

62.2 

60.7 

59.3 

58.0 

56.6 

55.3 

54.1 

52.8 

51.6 

14 

63.6 

62.3 

60.8 

59.4 

58.1 

56.7 

55.4 

54.2 

52.9 

51.7 

15 

63.6 

62.3 

60.8 

59.5 

58.1 

56.8 

55.5 

54.3 

53.0 

51.S 

16 

63.6 

62.3 

60.8 

59.5 

58.1 

56.8 

55.5 

54.3 

53.0 

51.8 

17 

63.6 

62.2 

60.8 

59.4 

58.1 

56.7 

55.5 

54.2 

53.0 

51.8 

18 

63.5 

62.2 

60.7 

59.4 

58.0 

56.7 

55.4 

54.2 

53.0 

51.8 

19 

63.5 

62.1 

60.7 

59.3 

58.0 

56.6 

55.4 

54.2 

52.9 

51.8 

B 


76 


RELATIVE    HUMIDITY    FROM    THE    TEMPERATURE    OF    THE    DEW-POINT. 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

t—t'  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.  —Fahrenheit. 

15.O 

15.5 

16.0 

16.5 

17.0 

17.5 

18.0 

18.5 

'  19.0 

19.5 

0° 

48.5 

47.3 

46.1 

45.0 

43.9 

42.8 

41.6 

40.6 

39.5 

38.5 

1 

48.7 

47.5 

46.3 

45.2 

44.0 

42.9 

41.8 

40.8 

39.7 

38.7 

2 

48.9 

47.7 

46.5 

45.4 

44.2 

43.1 

42.0 

41.0 

39.9 

38.9 

3 

49.1 

47.9 

46.7 

45.5 

44.4 

43.3 

42.2 

41.2 

40.2 

39.2 

4 

49.3 

48.1 

46.9 

45.7 

44.6 

43.5 

42.4 

41.4 

40.4 

39.4 

5 

49.4 

48.2 

47.1 

45.9 

44.8 

43.7 

42.6 

41.6 

40.6 

39.6 

6 

49.6 

48.4 

47.2 

46.1 

44.9 

43.9 

42.8 

41.8 

40.7 

39.8 

7 

49.7 

48.5 

47.3 

46.2 

45.1 

44.0 

42.9 

41.9 

40.9 

39.9 

8 

49.8 

48.7 

47.5 

46.4 

45.3 

44.2 

43.1 

42.1 

41.1 

40.1 

9 

50.0 

48.8 

47.6 

46.5 

45.4 

44.3 

43.3 

42.2 

41.2 

40.2 

10 

50.1 

48.9 

47.8 

46.7 

45.6 

44.5 

43.4 

42.4 

41.4 

40.4 

11 

50.2 

49.0 

47.9 

46.8 

45.7 

44.6 

43.5 

42.5 

41.5 

40.5 

12 

50.3 

49.1 

48.0 

46.9 

45.8 

44.7 

43.6 

42.6 

41.6 

40.6 

13 

50.4 

49.2 

48.1 

47.0 

45.9 

44.8 

43.7 

42.7 

41.7 

40.7 

14 

50.5 

49.3 

48.2 

47.1 

46.0 

44.9 

43.8 

42.8 

41.8 

40.8 

15 

50.6 

49.4 

48.3 

47.2 

46.1 

45.0 

43.9 

42.9 

41.9 

40.9 

16 

50.6 

49.5 

48.3 

47.2 

46.1 

45.0 

44.0 

43.0 

41.9 

41.0 

17 

50.6 

49.5 

48.3 

47.2 

46.1 

45.0 

44.0 

43.0 

42.0 

41.0 

18 

50.6 

49.5 

48.3 

47.2 

46.2 

45.0 

44.1 

43.1 

42.0 

41.1 

19 

0° 

50.6 

49.5 

48.3 

47.3 

46.2 

45.1 

44.1 

43.1 

42.1 

41.1 

20.0 

20.5 

21.0 

21.5 

22.0 

22.5 

23.0 

23.5 

24.0 

24.5 

37.5 

36.5 

35.5 

34.6 

33.7 

32.8 

31.9 

31.0 

30.2 

29.3 

1 

37.7 

36.8 

35.8 

34.8 

33.9 

33.0 

32.1 

31.3 

30.4 

29.6 

2 

37.9 

37.0 

36.0 

35.1 

34.2 

33.3 

32.4 

31.5 

30.7 

29.9 

3 

38.2 

37.2 

36.2 

35.3 

34.4 

33.5 

32.6 

31.8 

30.9 

30.1 

4 

38.4 

37.4 

36.5 

35.6 

34.6 

33.8 

32.9 

32.0 

31.2 

30.4 

5 

38.6 

37.7 

36.7 

35.8 

34.9 

34.0 

33.1 

32.3 

31.4 

30.6 

6 

38.8 

37.8 

36.9 

36.0 

35.0 

34.2 

33.3 

32.5 

31.6 

30.8 

7 

38.9 

38.0 

37.0 

36.1 

35.2 

34.3 

33.5 

32.6 

31.8 

31.0 

8 

39.1 

38.1 

37.2 

36.3 

35.4 

34.5 

33.6 

32.8 

32.1 

31.2 

9 

39.2 

38.3 

37.3 

36.4 

35.5 

34.7 

33.8 

33.0 

32.3 

31.4 

10 

39.4 

38.4 

37.5 

36.6 

35.7 

34.8 

34.0 

33.1 

32.5 

31.6 

11 

39.5 

38.6 

37.6 

36.7 

35.8 

35.0 

34.1 

33.3 

32.6 

31.7 

12 

39.6 

38.7 

37.8 

36.9 

36.0 

35.1 

34.2 

33.4 

32.7 

31.8 

13 

39.8 

38.8 

37.9 

37.0 

36.1 

35.2 

34.4 

33.6 

32.8 

32.0 

14 

39.9 

39.0 

38.0 

37.1 

36.2 

35.4 

34.5 

33.7 

32.9 

32.1 

15 

40.0 

39.1 

38.2 

37.3 

36.4 

35.5 

34.7 

33.9 

33.0 

32.2 

16 

40.0 

39.1 

38.2 

37.3 

36.4 

35.6 

34.7 

33.9 

33.1 

32.3 

17 

40.1 

39.2 

38.2 

37.4 

36.5 

35.6 

34.8 

34.0 

33.1 

32.4 

18 

40.1 

39.2 

38.3 

37.4 

36.5 

35.7 

34.8 

34.0 

33.2 

32.4 

19 

40.2 

39.3 

38.3 

37.5        36.6 

35.7 

34.9 

34.1 

33.2 

32.5 

B 


77 


RELATIVE    HUMIDITY    FROM    THE    TEMPERATURE    OF    THE    DEW-POINT. 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

t  —  t'  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.  —  Fahrenheit. 

0.0 

0.5 

l.O 

1.5 

2.0 

2.5 

3.0 

3.5 

4.0 

4.5 

20° 

100. 

97.8 

95.6 

93.4 

91.3 

89.2 

87.2 

85.2 

83.2 

81.3 

21 

100. 

97.8 

95.6 

93.4 

91.3 

89.3 

87.3 

85.3 

83.3 

81.5 

22 

100. 

97.8 

95.6 

93.5 

91.4 

89.3 

87.3 

85.4 

83.4 

81.6 

23 

100. 

97.8 

95.6 

93.5 

91.4 

89.4 

87.4 

85.5 

83.5 

81.7 

24 

100. 

97.8 

95.7 

93.5 

91.5 

89.5 

87.5 

85.5 

83.6 

81.8 

25 

100. 

97.8 

95.7 

93.6 

91.5 

89.5 

87.6 

85.6 

83.7 

81.9 

26 

100. 

97.8 

95.7 

93.6 

91.6 

89.6 

87.7 

85.7 

83.8 

82.0 

27 

100. 

97.9 

95.8 

93.7 

91.7 

89.7 

87.8 

85.9 

84.0 

82.1 

28 

100. 

97.9 

95.8 

93.8 

91.8 

89.8 

87.9 

86.0 

84.1 

82.3 

29 

100. 

97.9 

95.9 

93.8 

91.8 

89.9 

88.0 

86.1 

84.2 

82.4 

30 

100. 

97.9 

95.9 

93.9 

91.9 

90.0 

88.1 

86.2 

84.3 

82.5 

31 

100. 

98.0 

96.0 

94.0 

92.0 

90.1 

88.2 

86.4 

84.5 

82.7 

32 

100. 

98.0 

96.0 

94.0 

92.1 

90.2 

88.4 

86.6 

84.7 

83.0 

33 

100. 

98.0 

96.1 

94.1 

92.2 

90.4 

88.6 

86.7 

84.9        S3.2 

34 

100. 

98.0 

96.1 

94.2 

92.3 

90.5 

88.7 

86.9 

85.1 

83.4 

35 

100. 

98.0 

96.1 

94.3 

92.4 

90.6 

88.9 

87.1 

85.3 

83.6 

36 

100. 

98.1 

96.2 

94.3 

92.5 

90.7 

88.9 

87.1 

85.4 

83.7 

37 

100. 

98.1 

96.2 

94.3 

92.5 

90.7 

88.9 

87.2 

85.4 

83.7 

38 

100. 

98.1 

96.2 

94.3 

92.5 

90.7 

89.0 

87.2 

85.5 

83.8 

39 

100. 

98.1 

96.2 

94.3 

92.5 

90.7 

89.0 

87.2 

85.5 

83.9 

40 

100. 

98.1 

96.2 

94.4 

92.5 

90.8 

89.0 

87.3 

85.6 

83.9 

41 

100. 

98.1 

96.2 

94.4 

92.6 

90.8 

89.1 

87.3 

85.7 

84.0 

42 

100. 

98.1 

96.2 

94.4 

92.6 

90.8 

89.1 

87.4 

85.7 

84.1 

43 

100. 

98.1 

96.3 

94.4 

92.6 

90.9 

89.2 

87.5 

85.8 

84.2 

44 

100. 

98.1 

96.3 

94.5 

92.7 

90.9 

89.2 

87.5 

85.9 

84.2 

45 

100. 

98.1 

96.3 

94.5 

92.7 

91.0 

89.3 

87.6 

85.9 

84.3 

46 

100. 

98.1 

96.3 

94.5 

92.7 

91.0 

89.3 

87.6 

86.0 

84.4 

47 

100. 

98.1 

96.3 

94.5 

92.8 

91.0 

89.3 

87.7 

86.0 

84.4 

48 

100. 

98.2 

96.3 

94.6 

92.8 

91.1 

89.4 

87.7 

86.1 

84.4 

49 

100. 

98.2 

96.4 

94.6 

92.8 

91.1 

89.4 

87.7 

86.1 

84.5 

50 

100. 

98.2 

96.4 

94.6 

92.9 

91.1 

89.4 

87.8 

86.2 

84.5 

51 

100. 

98.2 

96.4 

94.6 

92.9 

91.2 

89.5 

87.8 

86.2 

84.6 

52 

100. 

98.2 

96.4 

94.6 

92.9 

91.2 

89.5 

87.9 

86.3 

84.7 

53 

100. 

98.2 

96.4 

94.7 

92.9 

91.2 

89.6 

87.9 

86.3 

84.7 

54 

100. 

98.2 

96.4 

94.7 

93.0 

91.3 

89.6 

88.0 

86.4 

84.8 

55 

100. 

98.2 

96.5 

94.7 

93.0 

91.3 

89.7 

88.0 

86.4 

84.8 

56 

100. 

98.2 

96.5 

94.7 

93.0 

91.4 

89.7 

88.1 

86.5 

84.9 

57 

100. 

98.2 

96.5 

94.8 

93.1 

91.4 

89.7 

88.1 

86.5 

85.0 

58 

100. 

98.2 

96.5 

94.8 

93.1 

91.4 

89.8 

88.2 

86.6 

85.0 

59 

100. 

98.2 

96.5 

94.8 

93.1 

91.5 

89.8 

88.2 

86.6 

85.1 

60 

100. 

98.2 

96.5 

94.8 

93.2 

91.5 

89.9 

88.3 

86.7 

85.1 

61 

100. 

98.3 

96.5 

94.9 

93.2 

91.5 

89.9 

88.3 

86.7 

85.2 

62 

100. 

98.3 

96.6 

94.9 

93.2 

91.6 

90.0 

88.4 

86.8 

85.3 

o.o 

0.5 

1.0 

1.5 

2.0 

2.5 

3.0 

3.5 

4.0 

4.5 

B 


78 


RELATIVE   HUMIDITY    FROM    THE   TEMPERATURE    OF    THE    DEW-POINT. 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

t  —  t'  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.  —  Fahrenheit. 

0.0 

0.5 

1.0 

1.5 

2.0 

2.5 

3.0 

3.5 

4.0 

4.5 

62° 

100. 

98.3 

96.6 

94.9 

93.2 

91.6 

90.0 

88.4 

86.8 

85.3 

63 

100. 

98.3 

96.6 

94.9 

93.2 

91.6 

90.0 

88.4 

86.8 

85.3 

64 

100. 

98.3 

96.6 

94.9 

93.3 

91.6 

90.0 

88.5 

86.9 

85.3 

65 

100. 

98.3 

96.6 

94.9 

93.3 

91.7 

90.1 

88.5 

86.9 

85.4 

66 

100. 

98.3 

96.6 

94.9 

93.3 

91.7 

90.1 

88.5 

87.0 

85.4 

67 

100. 

98.3 

96.6 

95.0 

93.3 

91.7 

90.1 

88.6 

87.0 

85.5 

68 

100. 

98.3 

96.6 

95.0 

93.4 

91.8 

90.2 

88.6 

87.1 

85.5 

69 

100. 

98.3 

96.6 

95.0 

93.4 

91.8 

90.2 

88.7 

87.2 

85.6 

70 

100. 

98.3 

96.7 

95.0 

93.4 

91.8 

90.3 

88.7 

87.2 

85.7 

71 

100. 

98.3 

96.7 

95.0 

93.4 

91.9 

90.3 

88.8 

87.2 

85.8 

72 

100. 

98.3 

^6.7 

95. 

93.5 

91.9 

90.3 

88.8 

87.3 

85.8 

73 

100. 

98.3 

96.7 

95. 

93.5 

91.9 

90.4 

88.8 

87.3 

85.9 

74 

100. 

98.3 

96.7 

95. 

93.5 

91.9 

90.4 

88.9 

87.4 

85.9 

75 

100. 

98.3 

96.7 

95. 

93.5 

92.0 

90.4 

88.9 

87.4 

86.0 

76 

100. 

98.3 

96.7 

95. 

93.6 

92.0 

90.5 

89.0 

87.5 

86.0 

77 

100. 

98.4 

96.7 

95.2 

93.6 

92.0 

90.5 

89.0 

87.5 

86.1 

78 

100. 

98.4 

96.7 

95.2 

93.6 

92.1 

90.5 

89.1 

87.6 

86.1 

79 

100. 

98.4 

96.8 

95.2 

93.6 

92.1 

90.6 

89.1 

87.6 

86.2 

80 

100. 

98.4 

96.8 

95.2 

93.6 

92.1 

90.6 

89.1 

87.7 

86.2 

81 

100. 

98.4 

96.8 

95.2 

93.7 

92.1 

90.6 

89.2 

87.7 

86.3 

82 

100. 

98.4 

96.8 

95.2 

93.7 

92.2 

90.7 

89.2 

87.8 

86.3 

83 

100. 

98.4 

96.8 

95.3 

93.7 

92.2 

90.7 

89.3 

87.8 

86.4 

84 

100. 

98.4 

96.8 

95.3 

93.7 

92.2 

90.8 

89.3 

87.8 

86.4 

85 

100. 

98.4 

96.8 

95.3 

92.8 

92.3 

90.8 

89.3 

87.9 

86.5 

86 

100. 

98.4 

96.8 

95.3 

93.8 

92.3 

90.8 

89.4 

87.9 

86.5 

87 

100. 

98.4 

96.9 

95.3 

93.8 

92.3 

90.9 

89.4 

88.0 

86.6 

88 

100. 

98.4 

96.9 

95.3 

93.8 

92.3 

90.9 

89.4 

88.0 

86.6 

89 

100. 

98.4 

96.9 

95.4 

93.9 

92.4 

90.9 

89.5 

88.1 

86.7 

90 

100. 

98.4 

96.9 

95.4 

93.9 

92.4 

91.0 

89.5 

88.1 

86.7 

91 

100. 

98.4 

96.9 

95.4 

93.9 

92.4 

91.0 

89.6 

88.2 

86.8 

92 

100. 

98.5 

96.9 

95.4 

93.9 

92.5 

91.0 

89.6 

88.2 

86.8 

93 

100. 

98.5 

96.9 

95.4 

93.9 

92.5 

91.1 

89.6 

88.2 

86.9 

94 

100. 

98.5 

96.9 

95.4 

94.0 

92.5 

91.1 

89.7 

88.3 

86.9 

95 

100. 

98.5 

97.0 

95.5 

94.0 

92.5 

91.1 

89.7 

88.3 

87.0 

98 

100. 

98.5 

97.0 

95.5 

94.0 

92.6 

91.2 

89.7 

88.4   ' 

87.0 

97 

100. 

98.5 

97.0 

95.5 

94.0 

92.6 

91.2 

89.8 

88,4 

87.0 

93 

100. 

98.5 

97.0 

95.5 

94.1 

92.6 

91.2 

89.8 

88.4 

87.1 

99 

100. 

98.5 

97.0 

95.5 

94.1 

92.7 

91.3 

89.9 

88.5 

87.1 

100 

100. 

98.5 

97.0 

95.6 

94.1 

92.7 

91.3 

89.9 

88.5 

87.2 

101 

100. 

98.5 

97.0 

95.6 

94.1 

92.7 

91.3 

89.9 

88.6 

87.2 

102 

100. 

98.5 

97.0 

95.6 

94.2 

92.7 

91.4 

90.0 

88.6 

87.3 

103 

100. 

98.5 

97.0 

95.6 

94.2 

92.8 

91.4 

90.0 

88.7 

87.3 

104 

100. 

98.  5 

97.0 

95.6 

94.2 

92.8 

91.4 

90.0 

88.7 

87.4 

0.0        0.5        1.0 

1.5        2.0 

2.5        3.0 

3.5 

4.O 

4.5 

B 


79 


RELATIVE    HUMIDITY    FROM    THE    TEMPERATURE    OF    THE    DEW-POINT. 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

t  —  f  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.  —  Fahrenheit. 

5.0 

5.5 

6.0 

6.5 

7.0 

7.5 

8.0 

8.5 

9.O 

9.5 

20° 

79.5 

77.7 

75.9 

74.2 

72.6 

71.0 

69.4 

67.9 

66.4 

64.9 

21 

79.6 

77.8 

76.0 

74.3 

72.7 

71.1 

69.5 

68.0 

66.4 

65.0 

22 

79.7 

77.9 

76.1 

74.4 

72.8 

71.2 

69.6 

68.0 

66.5 

65.0 

23 

79.8 

78.0 

76.2 

74.6 

72.9 

71.3 

69.6 

68.1 

66.5 

65.0 

24 

79.9 

78.1 

76.4 

74.7 

73.0 

71.4 

69.7 

68.1 

66.6 

65.1 

25 

80.0 

78.2 

76.5 

74.8 

73.1 

71.5 

69.8 

68.2 

66.6 

65.1 

26 

80.2 

78.4 

76.6 

74.9 

73.2 

71.7 

70.0 

68.4 

66.8 

65.3 

27 

80.3 

78.5 

76.8 

75.1 

73.4 

71  %8 

70.1 

68.6 

67.0 

65.5 

28 

80.5 

78.7 

76.9 

75.2 

73.6 

72.0 

70.3 

68.8 

67.2 

65.7 

29 

80.6 

78.8 

77.1 

75.4 

73.7 

72.1 

70.5 

68.9 

67.4 

65.9 

30 

80.7 

78.9 

77.2 

75.6 

73.9 

72.3 

70.-^ 

69.1 

67.6 

66.1 

31 

81.0 

79.2 

77.5 

75.8 

74.2 

72.6 

71.0 

69.4 

67.9 

66.4 

32 

81.2 

79.4 

77.7 

76.1 

74.4 

72.8 

71.3 

69.7 

68.2 

66.7 

33 

81.4 

79.7 

78.0 

76.4 

74.7 

73.1 

71.5 

70.0 

68.5 

67.0 

34 

81.7 

79.9 

78.3 

76.6 

75.0 

73.4 

71.8 

70.3 

68.8 

67.3 

35 

81.9 

80.2 

78.5 

76.9 

75.3 

73.7 

72.1 

70.6 

69.1 

67.6 

36 

82.0 

80.3 

78.6 

77.0 

75.4 

73.9 

72.3 

70.8 

69.3 

67.8 

37 

82.0 

80.4 

78.8 

77.2 

75.6 

74.0 

72.5 

71.0 

69.5 

68.1 

38 

82.1 

80.5 

78.9 

77.3 

75.8 

74.2 

72.7 

71.2 

69.8 

68.3 

39 

82.2 

80.6 

79.0 

77.4 

75.9 

74.4 

72.9 

71.5 

70.0 

68.6 

40 

82.3 

80.7 

79.1 

77.6 

76.1 

74.6 

73.2 

71.7 

70.2 

68.8 

41 

82.4 

80.8 

79.2 

77.7 

76.2 

74.7 

73.2 

71.8 

70.3 

68.9 

42 

82.5 

80.9 

79.3 

77.8 

76.3 

74.8 

73.3 

71.9 

70.5 

69.0 

43 
44 

82.5 
82.6 

80.9 
81.0 

79.4 
79.5 

77.9 

78.0 

7H 
76.5 

74.9 
75.0 

73.4 
73.5 

72.0 
72.1 

70.6 
70.7 

69.2 
69.3 

45 

82.7 

81.1 

79.6 

78.0 

76.5 

75.1 

73.6 

72.2 

70.8 

69.4 

46 

82.8 

81.2 

79.6 

78.1 

76.6 

75.1 

73.7 

72.3 

70.9 

69.5 

47 

82.8 

81.2 

79.7 

78.2 

76.7 

75.2 

73.8 

72.4 

71.0 

69.6 

48 

82.9 

81.3 

79.8 

78.2 

76.8 

75.3 

73.9 

72.5 

71.1 

69.7 

49 

82.9 

81.3 

79.8 

78.3 

76.8 

75.4 

74.0 

72.6 

71.2 

69.8 

50 

83.0 

81.4 

79.9 

78.4 

76.9 

75.5 

74.0 

72.7 

71.3 

69.9 

51 

83.0 

81.5 

80.0 

78.5 

77.0 

75.5 

74.1 

72.8 

71.4 

70.0 

52 

83.1 

81.5 

80.0 

78.5 

77.1 

75.6 

74.2 

72.8 

71.5 

70.1 

53 

83.2 

81.6 

80.1 

78.6 

77.2 

75.7 

74.3 

72.9 

71.6 

70.2 

54 

83.2 

81.7 

80.2 

78.7 

77.2 

75.8 

74.4 

73.0 

71.7 

70.3 

55 

83.3 

81.8 

80.3 

78.8 

77.3 

75.9 

74.5 

73.1 

71.8 

70.4 

56 

83.4 

81.8 

80.3 

78.9 

77.4 

76.0 

74.6 

73.2 

71.9 

70.5 

57 

83.4 

81.9 

80.4 

78.9 

77.5 

76.1 

74.7 

73.3 

72.0 

70.6 

58 

83.5 

82.0 

80.5 

79.0 

77.6 

76.2 

74.8 

73.4 

72.1 

70.7 

59 

83.6 

82.0 

80.6 

79.1 

77.7 

76.2 

74.9 

73.5 

72.2 

70.9 

60 

83.6 

82.1 

80.6 

79.2 

77-7 

76.3 

75.0 

73.6 

72.3 

71.0 

61 

83.7 

82.2 

80.7 

79.2 

77.8 

76.4 

75.0 

73.7 

72.4 

71.0 

62 

83.7 

82.2 

80^8 

79.3 

77.9 

76.5 

75.1 

73.8 

72.4 

71.1 

5.0 

5.5 

6.0 

6.5 

7.0 

7.5 

8.0 

8.5 

9.0 

9.5 

B 


80 


RELATIVE    HUMIDITY    FROM    THE    TEMPERATURE    OF    THE    DEW-POINT. 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

t  —  t'  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.  —  Fahrenheit. 

5.0 

5.5 

6.0 

6.5 

7.0 

7.5 

8.0 

8.5 

9.0 

9.5 

62° 

83.7 

82.2 

80.8 

79.3 

77.9 

76.5 

•75.1 

73.8 

72.4 

71.1 

63 

83.8 

82.3 

80.8 

79.4 

78.0 

76.6 

75.2 

73.9 

72.5 

71.2 

64 

83.9 

82.4 

80.9 

79.5 

78.1 

76.7 

75.3 

74.0 

72.6 

71.3 

65 

83.9 

62.4 

81.0 

79.6 

78.1 

76.8 

75.4 

74.0 

72.7 

71.4 

66 

84.0 

82.5 

81.1 

79.6 

78.2 

76.8 

75.5 

74.1 

72.8 

71.5 

67 

84.0 

82.6 

81.1 

79.7 

78.3 

76.9 

75.6 

74.2 

72.9 

71.6 

63 

84.1 

82.6 

81.2 

79.8 

78.4 

77.0 

75.7 

74.3 

73.0 

71.7 

69 

84.2 

82.7 

81.3 

79.9 

78.5 

77.1 

75.7 

74.4 

73.1 

71.8 

70 

84.2 

82.8 

81.3 

79.9 

78.5 

77.2 

75.8 

74.5 

73.2 

71.9 

71 

84.3 

82.8 

81.4 

80.0 

78.6 

77.3 

75.9 

74.6 

73.3 

72.0 

72 

84.3 

82.9 

81.5 

80.1 

78.7 

77.3 

76.0 

74.7 

73.4 

72.1 

73 

84.4 

8§.0 

81.5 

80.1 

78.7 

77.4 

76.1 

74.8 

73.5 

72.2 

74 

84.5 

83.0 

81.6 

80.2 

78.8 

77.5 

76.2 

74.9 

73.6 

72.3 

75 

84.5 

83.1 

81.7 

80.3 

78.9 

77.6 

76.2 

74.9 

73.7 

72.4 

76 

84.6 

83.1 

81.7 

80.4 

78.9 

77.7 

76.3 

75.0 

73.7 

72.5 

77 

84.6 

83.2 

81.8 

80.4 

79.0 

77.7 

76.4 

75.1 

73.8 

72.6 

73 

84.7 

83.3 

81.9 

80.5 

79.1 

77.8 

76.5 

75.2 

73.9 

72.7 

79 

84.7 

83.3 

81.9 

80.6 

79.1 

77.9 

76.6 

75.3 

74.0 

72.8 

80 

84.8 

83.4 

82.0 

80.6 

79.2 

78.0 

76.7 

75.4 

74.1 

72.9 

81 

84.9 

83.5 

82.1 

80.7 

79.3 

78.0 

76.7 

75.5 

74.2 

73.0 

82 

84.9 

83.5 

82.1 

80.8 

79.4 

78.1 

76.8 

75.5 

74.3 

73.0 

83 

85.0 

83.6 

82.2 

80.8 

79.4 

78.2 

76.9 

75.6 

74.4 

73.1 

84 

85.0 

83.6 

82.3 

80.9 

79.5 

78.3 

77.0 

75.7 

74.5 

73.2 

85 

85.1 

83.7 

82.3 

81.0 

79.6 

78.4 

77.1 

75.8 

74.6 

73.3 

86 

85.1 

83.7 

82.4 

81.1 

79.7 

78.4 

77.1 

75.9 

74.6 

73.4 

87 

85.2 

83.8 

82.5 

81.1 

79.8 

78.5 

77.2 

76.0 

74.7 

73.5 

88 

85.2 

83.9 

82.5 

81.2 

79.9 

78.6 

77.3 

76.1 

74.8 

73.6 

89 

85.3 

83.9 

82.6 

81.3 

79.9 

78.7 

77.4 

76.1 

74.9 

73.7 

90 

85.3 

84.0 

82.6 

81.3 

80.0 

78.7 

77.5 

76.2 

75.0 

73.8 

91 

85.4 

84.0 

82.7 

81.4 

80.1 

78.8 

77.5 

76.3 

75.1 

73.9 

92 

85.4 

84.1 

82.8 

81.5 

80.2 

78.9 

77.6 

76.4 

75.2 

74.0 

93 

85.5 

84.2 

82.8 

81.5 

80.2 

79.0 

77.7 

76.5 

75.2 

74.0 

94 

85.6 

84.2 

82.9 

81.6 

80.3 

79.0 

77.8 

76.6 

75.3 

74.1 

95 

85.6 

84.3 

83.0 

81.7 

80.4 

79.1 

77.9 

76.6 

75.4 

74.2 

96 

85.7 

84.3 

83.0 

81.7 

80.4 

79.2 

77.9 

76.7 

75.5 

74.3 

97 

85.7 

84.4 

83.1 

81.8 

80.5 

79.3 

78.0 

76.8 

75.6 

74.4 

93 

85.8 

84.4 

83.1 

81.9 

80.6 

79.3 

78.1 

76.9 

75.7 

74.5 

99 

85.8 

84.5 

83.2 

81.9 

80.7 

79.4 

78.2 

77.0 

75.8 

74.6 

100 

85.9 

84.6 

83.3 

82.0 

80.7 

79.5 

78.3 

77.0 

75.8 

74.7 

101 

85.9 

84.6 

83.3 

82.0 

80.8 

79.6 

78.3 

77.1 

75.9 

74.8 

102 

86.0 

84.7 

83.4 

82.1 

80.9 

79.6 

78.4 

77.2 

76.0 

74.9 

103 

86.0 

84.7 

83.4 

82.2 

80.9 

79.7 

78.5 

77.3 

76.1 

74.9 

104 

86.1 
5.O 

84.8 

83.5 

82.2 

81.0 

79.8 

78.6 

77.4 

76.2 

75.0 

5.5 

6.0 

6.5 

7.0 

7.5 

8.O 

8.5 

9.0 

9.5 

B 


81 


RELATIVE    HUMIDITY    FROM    THE    TEMPERATURE    OF    THE    DEW-POINT. 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

t  —  t'  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.—  Fahrenheit. 

10.0 

10.5 

11.0 

11.5 

12.O 

12.5 

13.0 

13.5 

14.0 

14.5 

20° 

63.5 

62.1 

60.6 

59.3 

58.0 

56.6 

55.4 

54.1 

52.9 

51.7 

21 

63.5 

62.1 

60.7 

59.3 

58.0 

56.6 

55.4 

54.2 

53.0 

51.8 

22 

63.5 

62.1 

60.7 

59.4 

58.0 

56.7 

55.5 

54.2 

53.0 

51.8 

23 

63.6 

62.1 

60.7 

59.4 

58.0 

56.7 

55.5 

54.3 

53.0 

51.9 

24 

63.6 

62.1 

60.7 

59.4 

58.1 

56.8 

55.5 

54.3 

53.1 

51.9 

25 

63.6 

62.1 

60.7 

59.4 

58.1 

56.8 

55.6 

54.4 

53.1 

52.0 

26 

63.8 

62.3 

60.9 

59.6 

58.3 

57.0 

55.7 

54.5 

53.3 

52.1 

27 

64.0 

62.5 

61.1 

59.8 

58.5 

57.2 

55.9 

54.6 

53.4 

52.2 

28 

64.2 

62.7 

61.3 

60.0 

58.6 

57.3 

56.0 

54.8 

53.5 

52.3 

29 

64.4 

63.0 

61.5 

60.2 

58.8 

57.5 

56.2 

54.9 

53.7 

52.4 

30 

64.6 

63.2 

61.8 

60.4 

59.0 

57.7 

56.3 

55.1 

53.8 

52.6 

31 

64.9 

63.5 

62.1 

60.7 

59.3 

58.0 

56.6 

53.4 

54.1 

52.9 

32 

65.2 

63.8 

62.4 

61.0 

59.6 

58.3 

57.0 

55.7 

54.4 

53.2 

33 

65.5 

64.1 

62.7 

61.3 

59.9 

58.6 

57.3 

56.0 

54.7 

53.5 

34 

65.8 

64.4 

63.0 

61.6 

60.2 

58.9 

57.6 

56.3 

55.0 

53.8 

35 

66.1 

64.7 

63.3 

61.9 

60.5 

59.2 

57.9 

56.6 

55.4 

54.1 

36 

66.4 

64.9 

63.5 

62.1 

60.8 

59.5 

58.2 

56.9 

55.6 

54.4 

37 

66.6 

65.2 

63.8 

62.4 

61.1 

59.8 

58.5 

57.2 

55.9 

54.7 

38 

66.9 

65.5 

64.1 

62.7 

61.4 

60.1 

58.8 

57.5 

56.2 

55.0 

39 

67.1 

65.7 

64.4 

63.0 

61.7 

60.3 

59.1 

57.8 

56.5 

55.3 

40 

67.4 

66.0 

64.6 

63.3 

62.0 

60.6 

59.4 

58.1 

56.8 

55.6 

41 

67.5 

66.1 

64.8 

63.5 

62.1 

60.9 

59.6 

58.3 

57.1 

55.9 

42 

67.7 

66.3 

65.0 

63.6 

62.3 

61.1 

59.8 

58.6 

57.3 

56.1 

43 

67.8 

66.4 

65.1 

63.8 

62.5 

61.3 

60.0 

58.8 

57.6 

56.4 

44 

67.9 

66.6 

65.3 

64.0 

62.7 

61.5 

60.3 

59.0 

57.8 

56.6 

45 

68.1 

66.7 

65.4 

64.2 

62.9 

61.7 

60.5 

59.3 

58.1 

56.9 

46 

68.2 

66.9 

65.6 

64.3 

63.0 

61.8 

60.6 

59.4 

58.2 

57.0 

47 

68.3 

67.0 

65.7 

64.4 

63.2 

61.9 

60.7 

59.5 

58.3 

57.2 

48 

68.4 

67.1 

65.8 

64.5 

63.3 

62.0 

60.8 

59.6 

58.5 

57.3 

49 

68.5 

67.2 

65.9 

64.6 

63.4 

62.1 

61.0 

59.8 

58.6 

57.4 

50 

68.6 

67.3 

66.0 

64.7 

63.5 

62.2 

61.1 

59.9 

58.7 

57.6 

51 

68.7 

67.4 

66.1 

64.9 

63.6 

62.4 

61.2 

60.0 

58.9 

57.7 

52 

68.8 

67.5 

66.2 

65.0 

63.7 

62.5 

61.3 

60.1 

59.0 

57.8 

53 

68.9 

67.6 

66.4 

65.1 

63.9 

62.6 

61.4 

60.3 

59.1 

58.0 

54 

69.0 

67.7 

66.5 

65.2 

64.0 

62.7 

61.6 

60.4 

59.2 

58.1 

55 

69.1 

67.8 

66.6 

65.3 

64.1 

62.9 

61.7 

60.5 

59.4 

58.2 

56 

69.2 

67.9 

66.7 

65.4 

64.2 

63.0 

61.8 

60.6 

59.5 

58.4 

57 

69.3 

6S.1 

66.8 

65.6 

64.3 

63.1 

61.9 

60.8 

59.6 

58.5 

58 

69.5 

68.2 

66.9 

65.7 

64.4 

63.2 

62.1 

60.9 

59.8 

58.6 

59 

69.6 

68.3 

67.0 

65.8 

64.6 

63.4 

62.2 

61.0 

59.9 

58.8 

60 

69.7 

68.4 

67.1 

65.9 

64.7 

63.5 

62.3 

61.2 

60.0 

58.9 

61 

69.8 

68.5 

67.2 

66.0 

64.8 

63.6 

62.4 

61.3 

60.1 

59.0 

62 

69.9 

68.6 

67.4 

66.1 

64.9 

63.7 

62.6 

61.4 

60.3 

59.1 

10.0 

10.5 

11.0 

11.5 

12.0 

12.5 

13.O 

13.5 

14.O 

14.5 

B 


RELATIVE    HUMIDITY    FROM    THE    TEMPERATURE    OF   THE    DEW-POINT. 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

t  —  t'  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.  —  Fahrenheit. 

1O.O 

10.5 

11.0 

11.5 

12.0 

12.5 

13.0 

13.5 

14.0 

14.5 

62° 

69.9 

68.6 

67.4 

66.1 

64.9 

63.7 

62.6 

61.4 

60.3 

59.1 

63 

70.0 

68.7 

67.5 

66.2 

65.0 

63.8 

62.7 

61.5 

60.4 

59.3 

64 

70.1 

68.8 

67.6 

66.3 

65.1 

64.0 

62.8 

61.6 

60.5 

59.4 

65 

70.2 

68.9 

67.7 

66.5 

65.3 

64.1 

62.9 

61.8 

60.6 

59.5 

66 

70.3 

69.0 

67.8 

66.6 

65.4 

64.2 

63.0 

61.9 

60.8 

59.7 

67 

70.4 

69.1 

67.9 

66.7 

65.5 

64.3 

63.2 

62.0 

60.9 

59.8 

68 

70.5 

69.2 

68.0 

66.8 

65.6 

64.4 

63.3 

62.1 

61.0 

59.9 

69 

70.6 

69.3 

68.1 

66.9 

65.7 

64.5 

63.4 

62.3 

61.1 

60.0 

70 

70.7 

69.4 

68.2 

67.0 

65.8 

64.7 

63.5 

62.4 

61.3 

60.2 

71 

70.8 

69.5 

68.3 

67.1 

65.9 

64.8 

63.6 

62.5 

61.4 

60.3 

72 

70.9 

69.6 

68.4 

67.2 

66.0 

64.9 

63.7 

62.6 

61.5 

60.4 

73 

71.0 

69.7 

68.5 

67.3 

66.2 

65.0 

63.9 

62.7 

61.6 

60.5 

74 

71.1 

69.8 

68.6 

67.4 

66.3 

65.1 

64.0 

62.8 

61.7 

60.7 

75 

71.1 

69.9 

68.7 

67.5 

66.4 

65.2 

64.1 

63.0 

61.9 

60.8 

76 

71.2 

70.0 

68.8 

67.6 

66.5 

65.3 

64.2 

63.1 

62.0 

60.9 

77 

71.3 

70.1 

68.9 

67.8 

66.6 

65.5 

64.3 

63.2 

62.1 

61.0 

78 

71.4 

70.2 

69.0 

67.9 

66.7 

65.6 

64.4 

63.3 

62.2 

61.1 

79  « 

71.5 

70.3 

69.1 

68.0 

66.8 

65.7 

64.5 

63.4 

62.3 

61.3 

80 

71.6 

70.4 

69.2 

68.1 

66.9 

65.8 

64.7 

63.6 

62.5 

61.4 

81 

71.7 

70.5 

,69.3 

68.2 

67.0 

65.9 

64.8 

63.7 

62.6 

61.5 

82 

71.8 

70.6 

69.4 

68.3 

67.1 

66.0 

64.9 

63.8 

62.7 

61.6 

83 

71.9 

70.7 

69.5 

68.4 

67.2 

66.1 

65.0 

63.9 

62.8 

-  61.8 

84 

72.0 

70.8 

69.6 

68.5 

67.3 

66.2 

65.1 

64.0 

62.9 

61.9 

85 

72.1 

70.9 

69.7 

68.6 

67.4 

66.3 

65.2 

64.1 

63.0 

62.0 

86 

72.2 

71.0 

69.8 

68.7 

674 

66.4 

65.3 

64.2 

63.2 

62.1 

87 

72.3 

71.1 

69.9 

68.8 

67.7 

66.5 

65.4 

64.4 

63.3 

62.2 

88 

72.4 

71.2 

70.0 

68.9 

67.8 

66.6 

65.5 

64.5 

63.4 

62.3 

89 

72.5 

71.3 

70.1 

69.0 

67.9 

66.8 

65.7 

64.6 

63.5 

62.5 

90 

72.6 

71.4 

70.2 

69.1 

68.0 

66.9 

65.8 

64.7 

63.6 

62.6 

91 

72.7 

71.4 

70.3 

69.2 

68.1 

67.0 

65.9 

64.8 

63.7 

62.7 

92 

72.8 

71.5 

70.4 

69.3 

68.2 

67.1 

66.0 

64.9 

63.9 

62.8 

93 

72.9 

71.6 

70.5 

69.4 

68.3 

67.2 

66.1 

65.0 

64.0 

62.9 

94 

72.9 

71.7 

70.6 

69.5 

68.4 

67.3 

66.2 

65.1 

64.1 

63.0 

95 

73.0 

71.8 

70.7 

69.6 

68.5 

67.4 

66.3 

65.2 

64.2 

63.2 

96 

73.1 

71.9 

70.8 

69.7 

68.6 

67.5 

66.4 

65.4 

64.3 

63.3 

97 

73.2 

72.0 

70.9 

69.8 

68.7 

67.6 

66.5 

65.5 

64.4 

63.4 

98 

73.3 

72.1 

71.0 

69.9 

68.8 

67.7 

66.6 

65.6 

64.5 

63.5 

99 

73.4 

72.3 

71.1 

70.0 

68.9 

67.8 

66.7 

65.7 

64.6 

63.6 

100 

73.5 

72.4 

71.2 

70.1 

69.0 

67.9 

66.8 

65.8 

64.8 

63.7 

101 

73.6 

72.5 

71.3 

70.2 

69.1 

68.0 

67.0 

65.9 

64.9 

63.9 

102 

73.7 

72.6 

71.4 

70.3 

69.2 

68.1 

67.1 

66.0 

65.0 

64.0 

103 

73.8 

72.7 

71.5 

70.4 

69.3 

68.2 

67.2 

66.1 

65.1 

64.1 

104 

73.9 

72.8 

71.6 

70.5 

69.4 

68.3 

67.3 

66.2 

65.2 

64.2 

10.0 

10.5     11.0 

11.5     12.0 

12.5 

13.0 

13.5 

14.0 

14.5 

B 


83 


10 


RELATIVE    HUMIDITY   FROM    THE    TEMPERATURE    OF    THE    DEW-POINT. 


Temper- 

t— t'  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.—  Fahrenheit. 

ature 
of  Air 

Fahren- 

heit. 

15.0 

15.5 

16.O 

16.5 

17.0 

17.5 

18.0 

18.5 

19.0 

19.5 

20° 

50.6 

49.5 

48.4 

47.3 

46.2 

45.1 

44.1 

43.1 

42.1 

41.2 

21 

50.6 

49.5 

48.4 

47.3 

46.2 

45.1 

44.2 

43.2 

42.2 

41.2 

22 

50.7 

49.5 

48.4 

47.4 

46.3 

45.2 

44.2 

43.2 

42.2 

41.3 

23 

50.7 

49.6 

48.5 

47.4 

46.3 

45.2 

44.2 

43.3 

42.3 

41.3 

24 

50.7 

49.6 

48.5 

47.4 

46.4 

45.3 

44.3 

43.3 

42.3 

41.4 

25 

50.8 

49.7 

48.5 

47.5 

46.4 

45.4 

44.3 

43.3 

42.4 

41.4 

26 

50.9 

49.8 

48.6 

47.6 

46.5 

45.4 

44.4 

43.4 

42.4 

41.5 

27 

51.0 

49.9 

48.7 

47.7 

46.6 

45.5 

44.5 

43.5 

42.5 

41.6 

28 

51.1 

50.0 

48.8 

47.7 

46.7 

45.6 

44.6 

43.6 

42.6 

41.6 

29 

51.2 

50.1 

48.9 

47.8 

46.8 

45.7 

44.7 

43.7 

42.7 

41.7 

30 

51.4 

50.2 

49.0 

47.9 

46.8 

45.8 

44.7 

43.7 

42.7 

41.8 

31 

51.7 

50.5 

49.4 

48.2 

47.1 

46.1 

45.0 

44.0 

43.0 

42.0 

32 

52.0 

50.8 

49.7 

48.5 

47.4 

46.4 

45.3 

44.3 

43.3 

42.3 

33 

52.3 

51.1 

50.0 

48.8 

47.7 

46.6 

45.6 

44.5 

43.5 

42.5 

34 

52.6 

51.4 

50.3 

49.1 

48.0 

46.9 

45.9 

44.8 

43.8 

42.8 

35 

52.9 

51.7 

50.6 

49.4 

48.3 

47.2 

46.1 

45.1 

44.1 

43.0 

36 

53.2 

52.0 

50.9 

49.7 

48.6 

47.5 

46.4 

45.4 

44.4 

43.3 

37 

53.5 

52.3 

51.2 

50.0 

48.9 

47.8 

46.7 

45.7 

44.7 

'43.6 

38 

53.8 

52.6 

51.5 

50.3 

49.2 

48.1 

47.0 

46.0 

45.0 

43.9 

39 

54.1 

52.9 

51.8 

50.6 

49.5 

48.4 

47.3, 

46.3 

45.3 

44.2 

40 

54.4 

53.2 

52.1 

50.9 

49.8 

48.7 

47.6 

46.6 

45.6 

44.5 

41 

54.7 

53.5 

52.3 

51.2 

50.1 

49.0 

47.9 

46.9 

45.8 

44.8 

42 

54.9 

53.8 

52.6 

51.5 

50.4 

49.3 

48.2 

47.2 

46.1 

45.1 

43 

55.2 

54.0 

52.9 

51.8 

50.7 

49.6 

48.5 

47.5 

46.4 

45.4 

44 

55.5 

54.3 

53.2 

52.1 

£0.9 

49.9 

48.8 

47.7 

46.7 

45.7 

45 

55.7 

54.6 

53.4 

52.3 

51.2 

50.2 

49.1 

48.0 

47.0 

46.0 

46 

55.9 

54.7 

53.6 

52.5 

51.4 

50.4 

49.3 

48.3 

47.2 

46.2 

47 

56.0 

54.9 

53.8 

52.7 

51.6 

50.6 

49.5 

48.5 

47.5 

46.5 

48 

56.2 

55.0 

54.0 

52.9 

51.8 

50.8 

49.8 

48.7 

47.7 

46.7 

49 

56.3 

55.2 

54.1 

53.1 

52.0 

51.0 

50.0 

49.0 

47.9 

47.0 

50 

56.5 

55.4 

54.3 

53.2 

52.2 

51.2 

50.2 

49.2 

48.2 

47.2 

51 

56.6 

55.5 

54.4 

53.4 

52.3 

51.3 

50.3 

49.3 

48.3 

47.4 

52 

56.7 

55.6 

54.6 

53.5 

52.5 

51.5 

50.5 

49.5 

48.5 

47.5 

53 

56.9 

55.8 

54.7 

53.6 

52.6 

51.6 

50.6 

49.6 

48.6 

47.7 

54 

57.0 

55.9 

54.8 

53.8 

52.7 

51.7 

50.7 

49.8 

48.8 

47.8 

55 

57.1 

56.0 

55.0 

53.9 

52.9 

51.9 

50.9 

49.9 

48.9 

48.0 

56 

57.3 

56.2 

55.1 

54.1 

53.0 

52.0 

51.0 

50.0 

49.1 

48.1 

57 

57.4 

56.3 

55.2 

54.2 

53.2 

52.2 

51.2 

50.2 

49.2 

48.3 

58 

57.5 

56.4 

55.4 

54.3 

53.3 

52.3 

51.3 

50.3 

49.4 

48.4 

59 

57.7 

•56.6 

55.5 

54.5 

53.4 

52.4 

51.4 

50.5 

49.5 

48.6 

60 

57.8 

56.7 

55.6 

54.6 

53.6 

52.6 

51.6 

50.6 

49.7 

48.7 

61 

57.9 

56.8 

55.8 

54.7 

53.7 

52.7 

51.7 

50.8 

49.8 

48.9 

62 

58.0 

57.0 

55.9 

54.9 

53.8 

52.8 

51.9 

50.9 

49.9 

49.0 

15.0 

15.5 

16.0 

16.5 

17.0 

17.5 

18.O 

18.5 

1O.O 

19.5 

B 


84 


RELATIVE    HUMIDITY    FROM    THE   TEMPERATURE    OF    THE    DEW-POINT. 


11 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

t  —  t'  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.  —  Fahrenheit. 

15.O 

15.5 

16.0 

16.5 

17.0 

17.5 

18.0 

18.5 

19.0 

19.5 

62° 

58.0 

57.0 

55.9 

54.9' 

53.8 

52.8 

51.9 

50.9 

49.9 

49.0 

63 

58.2 

57.1 

56.0 

55.0 

54.0 

53.0 

52.0 

51.0 

50.1 

49.1 

64 

58.3 

57.2 

56.2 

55.1 

54.1 

53.1 

52.1 

51.2 

50.2 

49.3 

65 

58.4 

57.4 

56.3 

55.3 

54.3 

53.3 

52.3 

51.3 

50.4 

49.4 

66 

58.6 

57.5 

56.4 

55.4 

54.4 

53.4 

52.4 

51.5 

50.5 

49.6 

67 

58.7 

57.6 

56.6 

55.5 

54.5 

53.5 

52.6 

51.6 

50.6 

49.7 

68 

58.8 

57.8 

56.7 

55.7 

54.7 

53.7 

52.7 

51.7 

50.8 

49.9 

69 

59.0 

57.9 

56.8 

55.8 

54.8 

53.8 

52.8 

51.9 

50.9 

50.0 

70 

59.1 

58.0 

57.0 

55.9 

54.9 

53.9 

53.0 

52.0 

51.1 

50.1 

71 

59.2 

5S.2 

57.1 

56.1 

55.1 

54.1 

53.1 

52.1 

51.2 

50.3 

72 

59.3 

58.3 

57.2 

56.2 

55.2 

54.2 

53.2 

52.3 

51.3 

50.4 

73 

59.5 

58.4 

57.4 

56.3 

55.3 

54.3 

53.4 

52.4 

51.5 

50.6 

74 

59.6 

58.5 

57.5 

56.5 

55.5 

54.5 

53.5 

52.6 

51.6 

50.7 

75 

59.7 

58.7 

57.6 

56.6 

55.6 

54.6 

53.6 

52.7 

51.7 

50.8 

76 

59.8 

58.8 

57.8 

56.7 

55.7 

54.7 

53.8 

52.8 

51.9 

51.0 

77 

60.0 

58.9 

57.9 

56.9 

55.9 

54.9 

53.9 

53.0 

52.0 

51.1 

78 

60.1 

59.1 

58.0 

57.0 

56.0 

55.0 

54.0 

53.1 

52.2 

51.2 

79 

60.2 

59.2 

58.1 

57.1 

56.1 

55.1 

54.2 

53.2 

52.3 

51.4 

sa 

60.3 

59.3 

58.3 

57.3 

56.3 

55.3 

54.3 

53.4 

52.4 

51.5 

81 

60.5 

59.4 

58.4 

57.4 

56.4 

55.4 

54.5 

53.5 

52.6 

51.7 

82 

60.6 

59.6 

58.5 

57.5 

56.5 

55.5 

54.6 

53.6 

52.7 

51.8 

83 

60.7 

59.7 

58.6 

57.6 

56.6 

55.7 

54.7 

53.8 

52.8 

51.9 

84 

60.8 

59.8 

58.8 

57.8 

56.8 

55.8 

54.8 

53.9 

53.0 

52.1 

85 

60.9 

59.9 

58.9 

57.9 

56.9 

55.9 

55.0 

54.0 

53.1 

52.2 

86 

61.1 

60.0 

59.0 

58.0 

57.0 

56.1 

55.1 

54.2 

53.2 

52.3 

87 

61.2 

60.2 

59.1 

58.1 

57.2 

56.2 

55.2 

54.3 

53.4 

52.5 

88 

61.3 

60.3 

59.3 

58.3 

57.3 

56.3 

55.4 

54.4 

53.5 

52.6 

89 

61.4 

60.4 

59.4 

58.4 

57.4 

56.5 

55.5 

54.6 

53.7 

52.7 

90 

61.6 

60.5 

59.5 

58.5 

57.6 

56.6 

55.6 

54.7 

53.8 

52.9 

91 

61.7 

60.7 

59.6 

58.7 

57.7 

56.7 

55.8 

54.8 

53.9 

53.0 

92 

61.8 

60.8 

59.8 

58.8 

57.8 

56.9 

55.9 

55.0 

54.1 

53.2 

93 

61.9 

60.9 

59.9 

58.9 

57.9 

57.0 

56.0 

55.1 

54.2 

53.3 

94 

62.0 

61.0 

60.0 

59.0 

58.1 

57.1 

56.2 

55.2 

54.3 

53.4 

95 

62.1 

61.1 

60.1 

59.2 

58.2 

57.2 

56.3 

55.4 

54.5 

53.6 

96 

62.3 

61.3 

60.3 

59.3 

58.3 

57.4 

56.4 

55.5 

54.6 

53.7 

97 

62.4 

61.4 

60.4 

59.4 

58.4 

57.5 

56.5 

55.6 

54.7 

53.8 

98 

62.5 

61.5 

60.5 

59.5 

58.6 

57.6 

56.7 

55.8 

54.9 

54.0 

99 

62.6 

61.6 

60.6 

59.6 

58.7 

57.7 

56.8 

55.9 

55.0 

54.1 

100 

62.7 

61.7 

60.7 

59.8 

58.8 

57.9 

56.9 

56.0 

55.1 

54.2 

101 

62.8 

61.9 

60.9 

59.9 

58.9 

58.0 

57.1 

56.2 

55.3 

54.4 

102 

63.0 

62.0 

61.0 

60.0 

59.1 

58.1 

57.2 

56.3 

55.4 

54.5 

103 

63.1 

62.1 

61.1 

60.1 

59.2 

58.3 

57.3 

56.4 

55.5 

54.6 

101 

63.2 

62.2 

61.2 

60.3 

59.3 

58.4 

57.5 

56.6 

55.7 

54.8 

15.O     15.5     16.O 

16.5     17.0 

17.5 

18.0 

18.5 

19.O 

19.5 

B 


85 


RELATIVE    HUBIIDITY   FROM    THE    TEMPERATURE    OF    THE    DEW-POINT. 


Temper- 

t —  t'  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.—  Fahrenheit. 

ature 

f\P  A  ?-»« 

oi  Air? 
Fahren- 

heit. 

2O.O 

20.5 

21.O 

21.5 

22.0 

22.5 

23.0 

23.5 

24.O 

24.5 

20° 

40.2 

39.3 

38.4 

37.5 

36.6 

35.8 

34.9 

34.1 

33.3 

32.5 

21 

40.3 

39.4 

38.4 

37.6 

36.7 

35.8 

35.0 

34.2 

33.4 

32.6 

22 

40.3 

39.4 

38.5 

37.6 

36.8 

35.9 

35.1 

34.3 

33.5 

32.7 

23 

40.4 

39.5 

38.6 

37.7 

36.8 

36.0 

35.2 

34.4 

33.6 

32.8 

24 

40.4 

39.6 

38.6 

37.8 

36.9 

36.1 

35.2 

34.4 

33.6 

32.9 

25 

40.5 

39.6 

38.7 

37.8 

37.0 

36.2 

35.3 

34.5 

33.7 

33.0 

26 

40.5 

39.7 

38.8 

37.9 

37.0 

36.2 

35.4 

34.6 

33.8 

33.1 

27 

40.6 

39.7 

38.8 

38.0 

37.1 

36.3 

35.5 

34.7 

33.9 

33.1 

28 

40.7 

39.8 

38.9 

38.0 

37.2 

36.3 

35.5 

34.7 

34.0 

83.2 

29 

40.8 

39.9 

38.9 

38.1 

37.2 

36.4 

35.6 

34.8 

34.0 

33.3 

30 

40.8 

39.9 

39.0 

38.1 

37.3 

36.5 

35.7 

34.9 

34.1 

33.4 

31 

41.1 

40.2 

39.2 

38.4 

37.5 

36.7 

35.9 

35.1 

34.3 

33.6 

32 

41.3 

40.4 

39.5 

38.6 

37.7 

37.0 

36.1 

35.3 

34.5 

33.8 

33 

41.6 

40.6 

39.7 

38.8 

38.0 

37.2 

36.3 

35.5 

34.7 

34.0 

34 

41.8 

40.9 

39.9 

39.1 

38.2 

37.4 

36.5 

35.7 

34.9 

34.2 

35 

42.1 

41.1 

40.2 

39.3 

38.4 

37.7 

36.7 

35.9 

35.1 

34.4 

36 

42.3 

41.4 

40.4 

39.6 

38.7 

37.9 

37.0 

36.2 

35.4 

34.6 

37 

42.6 

41.7 

40.7 

39.8 

38.9 

38.2 

37.2 

36.4 

35.6 

34.8 

38 

42.8 

42.0 

41.0 

40.1 

39.2 

38.4 

37.5 

36.6 

35.8 

35.0 

39 

43.1 

42.3 

41.3 

40.4 

39.5 

38.6 

37.7 

36.9 

36.0 

35.2 

40 

43.3 

42.6 

41.6 

40.7 

39.8 

38.9 

38.0 

37.1 

36.3 

35.4 

41 

43.7 

42.9 

41.9 

41.0 

40.0 

39.1 

38.3 

37.4 

36.5 

35.7 

42 

44.0 

43.2 

42.2 

41.2 

40.3 

39.4 

38.5 

37.7 

36.8 

36.0 

43 

44.3 

43.4. 

42.5 

41.5 

40.6 

39.7 

38.8 

38.0 

37.1 

36.3 

44 

44.7 

43.7 

42.8 

41.8 

40.9 

40.0 

39.1 

38.2 

37.4 

36.6 

45 

45.0 

44.0 

43.1 

42.1 

41.2 

40.3 

39.4 

38.5 

37.7 

36.8 

46 

45.2 

44.3 

43.3 

42.4 

41.4 

40.5 

39.7 

38.8 

37.9 

37.1 

47 

45.5 

44.5 

43.6 

42.6 

41.7 

40.8 

39.9 

39.1 

38.2 

37.4 

48 

45.7 

44.8 

43.8 

42.9 

42.0 

41.1 

40.2 

39.3 

38.5 

37.6 

49 

46.0 

45.0 

44.1 

43.2 

42.2 

41.3' 

40.5 

39.6 

38.7 

37.9 

50 

46.2 

45.3 

44.3 

43.4 

42.5 

41.6 

40.7 

39.9 

39.0 

37,2 

51 

46.4 

45.4 

44.5 

43.6 

42.7 

41.8 

40.9 

40.1 

39.2 

38.4 

52 

46.6 

45.5 

44.7 

43.8 

42.9 

42.0 

41.2 

40.3 

39.5 

38.6 

53 

46.7 

45.8 

44.9 

44.0 

43.1 

42.2 

41.4 

40.5 

39.7 

88.9 

54 

46.9 

46.0 

45.1 

44.2 

43.3 

42.4 

41.6 

40.8 

39.9 

39.1 

55 

47.0 

46.1 

45.2 

44.4 

43.5 

42.6 

41.8 

41.0 

40.1 

39.3 

56 

47.2 

46.3 

45.4 

44.5 

43.6 

42.8 

42.0 

41.1 

40.3 

39.5 

57 

47.3 

46.4 

45.5 

44.7 

43.8 

42.9 

42.1 

41.3 

40.5 

39.6 

58 

47.5 

46.6 

45.7 

44.8 

43.9 

43.1 

42.3 

41.4 

40.6 

39.8 

59 

47.6 

46.7 

45.8 

45.0 

44.1 

43.2 

42.4 

41.6 

40.8 

40.0 

60 

47.8 

46.9 

46.0 

45.1 

44.2 

43.4 

42.5 

41.7 

40.9 

40.1 

61 

47.9 

47.0 

46.1 

45.3 

44.4 

43.5 

42.7 

41.9 

41.1 

40.3 

62 

48.1 

47.2 

46.3 

45.4 

44.5 

43.7 

42.8 

42.0 

41.2 

40.4 

20.0    20.5 

21.0 

21.5 

22.0 

22.5 

23.0 

23.5 

24,0 

24.5 

B 


86 


RELATIVE    HUMIDITY    FROM    THE    TEMPERATURE    OF    THE    DEW-POINT. 


13 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

t  —  t'  =  Difference  of  Temperatures  of  the  Air  and  of  the  Dew-Point.  —  Fahrenheit. 

2O.O     2O.5 

i 

21.0 

21.5 

22.0 

22.5 

23.0 

23.5 

24.0 

24.5 

62° 

48.1 

47.2 

46.3 

45.4 

44.5 

43.7 

42.8 

42.0 

41.2 

40.4 

63 

48.2 

47.3 

46.4 

45.5 

44.7 

43.8 

43.0 

42.2 

41.4 

40.6 

64 

48.4 

47.5 

46.6 

45.7 

44.8 

44.0 

43.1 

42.3 

41.5 

40.7 

65 

48.6 

47.6 

46.7 

45.8 

45.0 

44.1 

43.3 

42.5 

41.7 

40.9 

66 

48.7 

47.8 

46.9 

46.0 

45.1 

44.3 

43.4 

42.6 

41.8 

41.0 

67 

48.8 

47.9 

47.0 

46.1 

45.3 

44.4 

43.6 

42.8 

42.0 

41.2 

68 

48.9 

48.0 

47.2 

46.3 

45.4 

44.6 

43.7 

42.9 

42.1 

41.3 

69 

49.1 

48.2 

47.3 

46.4 

45.6 

44.7 

43.9 

43.1 

42.3 

41.5 

70 

49.2 

48.3 

47.4 

46.6 

45.7 

44.9 

44.0 

43.2 

42.4 

41.6 

71 

49.4 

48.5 

47.6 

46.7 

45.9 

45.0 

44.2 

43.4 

42.6 

41.8 

72 

49.5 

48.6 

47.7 

46.9 

46.0 

45.2 

44.3 

43.5 

42.7 

41.9 

73 

49.6 

48.8 

47.9 

47.0 

46.1 

45.3 

44.5 

43.7 

42.9 

42.1 

74 

49.8 

48.9 

48.0 

47.1 

46.3 

45.4 

44.6 

43.8 

43.0 

42.2 

75 

49.9 

49.0 

48.2 

47.3 

46.4 

45.6 

44.8 

44.0 

43.1 

42.4 

76 

50.1 

49.2 

48.3 

47.4 

46.6 

45.7 

44.9 

44.1 

43.3 

42.5 

77 

50.2 

49.3 

48.5 

47.6 

46.7 

45.9 

45.1 

44.2 

43.4 

42.6 

78 

50.3 

49.5 

48.6 

47.7 

46.9 

46.0 

45.2 

44.4 

43.6 

42.8 

79 

50.5 

49.6 

48.7 

47.8 

47.0 

46.2 

45.3 

44.5 

43.7 

43.0 

80 

50.6 

49.7 

48.9 

48.0 

47.2 

46.3 

45.5 

44.7 

43.9 

43.1 

81 

50.8 

49.9 

49.0 

48.1 

47.3 

46.5 

45.6 

44.8 

44.0 

43.2 

82 

50.9 

50.0 

49.2 

48.3 

47.4 

46.6 

45.8 

45.0 

44.2 

43.4 

83 

51.0 

50.1 

49.3 

48.4 

47.6 

46.8 

45.9 

45.1 

44.3 

43.5 

84 

51.2 

50.3 

49.4 

48.6 

47.7 

46.9 

46.1 

45.3 

44.5 

43.7 

85 

51.3 

50.4 

49.6 

48.7 

47.9 

47.0 

46.2 

45.4 

44.6 

43.8 

86 

51.4 

50.6 

49.7 

48.8 

48.0 

47.2 

46.4 

45.6 

44.8 

44.0 

87 

51.6 

50.7 

49.8 

49.0 

48.1 

47.3 

46.5 

45.7 

44.9 

44.1 

88 

51.7 

50.8 

50.0 

49.1 

48.3 

47.5 

46.6 

45.8 

45.0 

44.3  ' 

89 

51.9 

51.0 

50.1 

49.3 

48.4 

47.6 

46.8 

46.0 

45.2 

44.4 

90 

52.0 

51.1 

50.3 

49.4 

48.6 

47.7 

46.9 

46.1 

45.3 

44.6 

91 

52.1 

51.3 

50.4 

49.5 

48.7 

47.9 

47.1 

46.3 

45.5 

44.7 

92 

52.3 

51.4 

50.5 

49.7 

48.8 

48.0 

47.2 

46.4 

45.6 

44.8 

93 

52.  "4 

51.5 

50.7 

49.8 

49.0 

48.2 

47.4 

46.6 

45.8 

45.0 

94 

52.5 

51.7 

50.8 

50.0 

49.1 

48.3 

47.5 

46.7 

45.9 

45.1 

95 

52.7 

51.8 

50.9 

50.1 

49.3 

48.4 

47.6 

46.8 

46.1 

45.3 

96 

52.8 

51.9 

51.1 

50.2 

49.4 

48.6 

47.8 

47.0 

46.2 

45.4 

97 

52.9 

52.1 

51.2 

50.4 

49.5 

48.7 

47.9 

47.1 

46.3 

45.6 

98 

53.1 

52.2 

51.4 

50.5 

49.7 

48.9 

48.1 

47.3 

46.5 

45.7 

99 

53.2 

52.3 

51.5 

50.6 

49.8 

49.0 

48.2 

47.4 

46.6 

45.5 

100 

53.4 

52.5 

51.6 

50.8 

50.0 

49.1 

48.3 

47.5 

46.8 

46.0 

101 

53.5 

52.6 

51.8 

50.9 

50.1 

49.3 

,   48.5 

47.7 

46.9 

46.2 

102 

53.6 

52.8 

51.9 

51.1 

50.2 

49.4 

48.6 

47.8 

47.1 

46.3 

103 

53.8 

52.9 

52.0 

51.2 

50.4 

49.6 

48.8 

48.0 

47.2 

46.4 

104 

53.9 

53.0 

52.2 

51.3 

50.5 

49.7 

48.9 

48.1 

47.3 

46.6 

20.0 

2O.5     21.O 

21.5 

22.0 

22.5 

23.0 

23.5 

24.0 

24.5 

B 


87 


TABLE    IX. 

FACTOR   -^°,    FOR    COMPUTING    THE    RELATIVE    HUMIDITY,  OR   THE    DEGREE  OF  MOISTURE 

OF    THE    AIR,    EXPRESSED    IN    HUNDREDTHS,    FROM    ITS    ABSOLUTE 

HUMIDITY   GIVEN    IN    ENGLISH    MEASURES. 

THE  Relative  Humidity,  or  the  degree  of  moisture  of  the  air,    is,  as  explained 
above,  the  ratio  of  the  quantity  of  vapor  contained  in  the  air  to  the  quantity  it  could 
contain  at  the  temperature  observed,  if  fully  saturated. 
If  we  call 

The  force  of  vapor  contained  in  the  air  =  f, 

The  maximum  of  the  force  of  vapor  at  the  temperature  of  the  air  =  F, 
The  point  of  saturation  =  100, 
we  have  the  proportion, 

Relative  Humidity  :  100  : :/:  F, 
and 

/x_ioo  _  £eiative  Humidity  in  Hundredths. 

But  as  — j —  =fx  "jr,  it  is  obvious  that  the  operation  indicated  by  the  former 
expression,  viz.  ^-~— ,  would  be  reduced  to  a  simple  multiplication,  if  we  had  a 
table  of  the  factors  1^°.  Such  a  table  is  obtained  by  dividing  the  constant  number 
100  by  each  number  in  the  Table  of  Elastic  Forces  of  Vapor,  and  substituting  the 
quotients  for  the  tensions,  or  forces  of  vapor. 

The  following  Table  gives  the  factor  -^  for  every  tenth  of  a  degree  from  0°  to 
104°  Fahrenheit,  corresponding  to  the  Forces  of  Vapor  in  Table  VI.,  or  Regnault's 
table  reduced  to  English  measures. 

USE  OF  THE  TABLE. 

The  force  of  vapor  contained  in  the  air,  or  its  absolute  humidity,  being  given  in 
English  measures,  multiply  the  number  expressing  it  by  the  factor  in  the  table  cor- 
responding to  the  temperature  of  the  air  at  the  time  of  the  observation  ;  the  result 
will  be  the  Relative  Humidity  in  Hundredths. 

Examples. 
1.     Suppose  the  temperature  of  the  air  to  be  —  60°  Fahrenheit. 

"         "    force  of  vapor  in  the  air  to  be  =  .388  English  inch. 

Opposite  60°  is  found  in  the  table  the  factor  193.1. 

Then          0.388  x  193.1  =  74.9,  Relative  Humidity  in  Hundredths. 


2.     Suppose  the  temperature  of  the  air  to  be  =  74°. 5  Fahrenheit. 
"         "    force  of  vapor  in  the  air  to  be'  =  .650  English  inch. 
Table  gives  for  74°.5  the  factor  117.2. 

Then  0.650  X  117.2  —  76.2,  Relative  Humidity  required. 

B  88 


IX.    FACTOR  ^,  FOR  COMPUTING  THE  RELATIVE  HUMIDITY,  OR  THE 
DEGREE   OF  MOISTURE   OF  THE  AIR, 

EXPRESSED   IN    HUNDREDTHS,    FROM    ITS    ABSOLUTE    HUMIDITY 
GIVEN    IN    ENGLISH    INCHES. 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

y. 

8. 

9. 

0° 

2306 

2295 

2285 

2275 

2264 

2254 

2243 

2233 

2222 

2211 

1 

2201 

2191 

2181 

2171 

2162 

2152 

2142 

2132 

2122 

2111 

2 

2101 

2092 

2083 

2074 

2064 

2055 

2045 

2036 

2026 

2017 

3 

2007 

1998 

1990 

1981 

1972 

1963 

1954 

1945 

1936 

1927 

4 

1918 

1910 

1901 

1893 

1885 

1876 

1868 

1859 

1851 

1842 

5 

1834 

1826 

1818 

1810 

1802 

1794 

1786 

1777 

1769 

1761 

6 

1753 

1745 

1738 

1730 

1722 

1714 

1707 

1699 

1691 

1683 

7 

1675 

1668 

1660 

1653 

1646 

1638 

1631 

1623 

1616 

1608 

8 

1600 

1594 

1587 

1580 

1572 

1565 

1558 

1551 

1544 

1537 

9 

1529 

1523 

1516 

1509 

1503 

1496 

1489 

1482 

1475 

1469 

10 

1462 

1455 

1449 

1443 

1436 

1430 

1423 

1417 

1410 

1404 

11 

1397 

1391 

1385 

1379 

1373 

1367 

1361 

1355 

1348 

1342 

12 

1336 

1330 

1324 

1319 

1313 

1307 

1301 

1295 

1289 

1284 

13 

1278 

1272 

1267 

1261 

1255 

1250 

1244 

1239 

1233 

1228 

14 

1222 

1217^ 

1211 

1206 

1200 

1195 

1189 

1184 

1178 

1173 

15 

1167 

1162 

1157 

1151 

1146 

1141 

1136 

1130 

1125 

1120 

16 

1114 

1109 

1104 

1099 

1094 

1089 

1084 

1079 

1074 

1069 

17 

1064 

1059 

1055 

1050 

1045 

1040 

1035 

1031 

1026 

1021 

18 

1016 

1012 

1007 

1003 

998.2 

993.6 

989.1 

984.5 

979.9 

975.3 

19 

970.6 

966.4 

962.2 

957.9 

953.7 

949.4 

945.0 

940.7 

936.3 

931.9 

20 

927.5 

923.5 

919.5 

915.5 

911.4 

907.4 

903.3 

899.1 

895.0 

890.8 

21 

886.7 

882.9 

879.1 

875.3 

871.4 

867.6 

863.7 

859.8 

855.8 

851.9 

22 

847.9 

844.3 

840.7 

837.1 

833.4 

829.8 

826.1 

822.4 

818.7 

815.0 

23 

811.2 

807.8 

804.3 

800.8 

797.3 

793.8 

790.2 

786.7 

783.1 

779.5 

24 

775.9 

772.6 

769.3 

766.0 

762.7 

759.3 

756.0 

752.6 

749.2 

745.8 

25 

742.4 

739.3 

736.2 

733.0 

729.9 

726.7 

723.5 

720.3 

717.1 

713.9 

26 

710.6 

707.7 

704.7 

701.8 

698.8 

695.8 

692.8 

689.7 

686.7 

683.6 

27 

680.5 

677.8 

675.0 

672.1 

669.3 

666.5 

663.6 

660.7 

657.8 

654.9 

28 

652.0 

649.4 

646.7 

644.1 

641.4 

638.7 

636.0 

633.3 

630.5 

627.8 

29 

625.0 

622.5 

620.0 

617.5 

614.9 

612.4 

609.8 

607.2 

604.6 

602.0 

30 

599.4 

597.1 

594.7 

592.3 

589.9 

587.4 

585.0 

582.6 

580.1 

577.6 

31 

575.1 

572.9 

570.7 

568.4 

566.2 

563.9 

561.6 

559.2 

556.9 

554.5 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

B 


89 


FACTOR 


100 


FOR    COMPUTING    THE    RELATIVE    HUMIDITY. 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

Tenths  of  Degrees. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

32° 

552.2 

550.0 

547.8 

545.7 

543.6 

5"41.4 

539.3 

537.2 

535.1 

533.0 

33 

530.9 

528.8 

526.8 

524.7 

522.7 

520.6 

518.6 

516.5 

514.5 

512.5 

34 

510.5 

508.5 

506.5 

504.5 

502.5 

500.5' 

498.6 

496.6 

494.7 

492.7 

35 

490.8 

488.9 

487.0 

485.1 

483.2 

481.3 

479.4 

477.5 

475.6 

473.8 

36 

471.9 

470.1 

468.2 

466.4 

464.6 

462.8 

461.0 

459.2 

457.4 

455.6 

37 

453.8 

452.0 

450.3 

448.5 

446.8 

445.0 

443.3 

441.6 

439.9 

438.1 

38 

436.4 

434.7 

433.1 

431.4 

429.7 

428.0 

426.4 

424.7 

423.1 

421.4 

39 

419.8 

418.2 

416.6 

415.0 

413.4 

411.8 

410.2 

408.6 

407.0 

405.5 

40 

403.9 

402.4 

400.8 

399.3 

397.8 

396.2 

394.7 

393.2 

391.7 

290.2 

41 

388.7 

387.2 

385.8 

384.3 

382.9 

381.4 

380.0 

378.5 

377.1 

375.7 

42 

374.3 

372.9 

371.5 

370.0 

368.6 

367.3 

365.9 

364.5 

363.1 

361.7 

43 

360.4 

359.0 

357.6 

356.3 

354.9 

353.6 

352.3 

350.9 

349.6 

348.3 

44 

347.0 

345.6 

344.3 

343.0 

341.7 

340.4 

339.2 

337.9 

336.6 

335.3 

45 

334.1 

332.8 

331.6 

330.3 

328.1 

327.8 

326.6 

325.4 

324.1 

322.9 

46 

321.7 

320.5 

319.3 

318.1 

316.9 

315.7 

314.5 

313.3 

312.2 

311.0 

47 

309.8 

308.7 

307.5 

306.4 

305.2 

304.1 

302.9 

301.8 

300.7 

299.6 

48 

298.5 

297.3 

296.2 

295.1 

294.0 

292.9 

291.9 

290.8 

289.7 

288.6 

49 

287.6 

286.5 

285.4 

284.4 

283.3 

282.3 

281.3 

280.2 

279.2 

278.2 

50 

277.1 

276.1 

275.1 

274.1 

273.1 

272.1 

271.1 

270.1 

269.1 

268.2 

51 

267.2 

266.2 

265.2 

264.3 

263.3 

262.3 

261.4 

260.4 

259.5 

258.5 

52 

257.6 

256.6 

255.7 

254.8 

253.8 

252.9 

252.0 

251.1 

250.2 

249.3 

53 

248.3 

247.4 

246.5 

245.6 

244.7 

243.9 

243.0 

242.1 

241.2 

240.3 

54 

239.5 

238.6 

237.7 

236.9 

236.0 

235.1 

234.3 

233.4 

232.6 

231.7 

55 

230.9 

230.1 

229.2 

228.4 

227.6 

226.8 

225.9 

225.1 

224.3 

223.5 

56 

222.7 

221.9 

221.1 

220.3 

219.5 

218.7 

217.9 

217.1 

216.4 

215.6 

57 

214.8 

214.0 

213.3 

212.5 

211.8 

211.0 

210.2 

209.5 

208.7 

208.0 

58 

207.3 

206.5 

205.8 

205.0 

204.3 

203.6 

202.9 

202.2 

201.4 

200.7 

59 

200.0 

199.3 

198.6 

197.9 

197.2 

196.5 

195.8 

195.1 

194.4 

193.8 

60 

193.1 

192.4 

191.7 

191.0 

190.4 

189.7 

189.0 

188.4 

187.7 

187.0 

61 

186.4 

185.7 

185.1 

184.4 

183.8 

183.1 

182.5 

181.8 

181.2 

180.6 

62 

179.9 

179.3 

178.7 

178.0 

177.4 

176.8 

176.2 

175.6 

174.9 

174.3 

63 

173.7 

173.1 

172.5 

171.9 

171.3 

170.7 

170.1 

169.5 

168.9 

168.3 

64 

167.7 

167.1 

166.6 

166.0 

165.4 

164.8 

164.3 

163.7 

163.1 

162.5 

65 

162.0 

161.4 

160.9 

160.3 

159.7 

159.2 

158.6 

158.1 

157.5 

157.0 

66 

156.5 

155.9 

155.4 

154.8 

154.3 

153.8 

153.2 

152.7 

152.2 

151.7 

67 

151.1 

150.6 

150.1 

149.6 

149.1 

148.6 

148.1 

147.6 

147.1 

146.6 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

V. 

8. 

9. 

B 


90 


FACTOR 


100 


FOR    COMPUTING   THE    RELATIVE    HUMIDITY. 


Temper- 
ature 
of  Air, 
Fahren- 
heit. 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

§. 

9. 

63° 
69 

146.0 
141.2 

145.6 
140.7 

145.1 

140.? 

144.6 
139.7 

144.1 
139.2 

143.6 

138.8 

143.1 
138.3 

142.6 
137.8 

142.1 
137.4 

141.6 
136.9 

70 

136.4 

136.0 

135.5 

135.1 

134.6 

134.1 

133.7 

133.2 

132.8 

132.3 

71 

131.9 

131.4 

131.0 

130.5 

130.1 

129.7 

129.2 

128.8 

128.3 

127.9 

72 

127.5 

127.1 

126.6 

126.2 

125.8 

125.3 

124.9 

124.5 

124.1 

123.7 

73  ' 

123.3 

122.8 

122.4 

122.0 

121.6 

121.2 

120.8 

120.4 

120.0 

119.6 

74 

119.2 

118.8 

118.4 

118.0 

117.6 

117.2 

116.8 

116.4 

116.0 

115.6 

75 

115.3 

114.9 

114.5 

114.1 

113.7 

113.3 

113.0 

112.6 

112.2 

111.9 

76 

111.5 

111.1 

110.7 

110.4 

110.0 

109.6 

109.3 

108.9 

108.6 

108.2 

77 

107.9 

107.5 

107.1 

106.8 

106.4 

106.1 

105.7 

105.4 

105.1 

104.7 

78 

104.4 

104.0 

103.7 

103.3 

103.0 

102.7 

102.3 

102.0 

101.7 

101.3 

79 

101.0 

100.7 

100.3 

100.0 

99.68 

99.35 

99.02 

98.70 

98.38 

98.06 

80 

97.73 

97.42 

97.10 

96.78 

96.47 

96.15 

95.84 

95.52 

95.21 

94.90 

81 

94.59 

94.29 

93.98 

93.67 

93.37 

93.06 

92.76 

92.46 

92.16 

91.86 

82 

91.56 

91.26 

90.97 

90.67 

90.38 

90.09 

89.80 

89.51 

89.22 

88.93 

83 

88.64 

88.36 

8i.07 

87.79 

87.50 

87.22 

86.94 

86.66 

86.38 

86.10 

84 

85.83 

85.55 

85.27 

85.00 

84.73 

84.46 

84.19 

83.92 

83.65 

83.38 

85 

83.12 

82.85 

82.59 

82.32 

82.06 

81.80 

81.54 

81.28 

81.02 

80.77 

86 

80.51 

80.25 

80.00 

79.74 

79.49 

79.24 

78.99 

78.74 

78.49 

78.24 

87 

77.99 

77.75 

77.50 

77.26 

77.01 

76.77 

76.52 

76.28 

76.04 

75.80 

88 

75.56 

75.32 

75.08 

74.85 

74.61 

74.37 

74.14 

73.91 

73.67 

73.44 

89 

73.21 

72.98 

72.75 

72.52 

72.29 

72.06 

71.84 

71.61 

71.39 

71.16 

90 

70.94 

70.72 

70.49 

70.27 

70.05 

69.83 

69.61 

69.39 

69.18 

68.96 

91 

68.74 

68.53 

68.32 

68.10 

67.89 

67.68 

67.47 

67.26 

67.05 

66.84 

92 

66.63 

66.42 

66.22 

66.01 

65.81 

65.60 

65.40 

65.19 

64.99 

64.79 

93 

64.59 

64.39 

64.19 

63.99 

63.79 

63.59 

63.40 

63.20 

63.01 

62.81 

94 

62.62 

62.43 

62.24 

62.04 

61.85 

61.66 

61.47 

61.29 

61.10 

60.91 

95 

60.72 

60.54 

60.35 

60.17 

59.98 

59.80 

59.62 

59.43 

59.25 

59.07 

96 

58.89 

58.71 

58.53 

58.35 

58.17 

58.00 

57.82 

57.64 

57.47 

57.29 

97 

57.12 

56.94 

56.77 

56.60 

56.42 

56.25 

56.08 

55.91 

55.74 

55.57 

93 

55.40 

55.23 

55.06 

54.90 

54.73 

54.56 

54.40 

54.23 

54.07 

53.91 

99 

53.74 

53.58 

53.42 

53.26 

53.09 

52.93 

52.77 

52.61 

52.45 

52.30 

100 

52.14 

51.98 

51.82 

51.67 

51.51 

51.36 

51.20 

51.05 

50.90 

50.74 

101 

50.59 

50.44 

50.29 

50.14 

49.99 

49.84 

49.69 

49.54 

49.39 

49.24 

102 

49.10 

48.95 

48.80 

48.66 

48.51 

48.37 

48.22 

48.08 

47.94 

47.79 

103 

47.65 

47.51 

47.37 

47.23 

47.09 

46.95 

46.81 

46.67 

46.53 

46.40 

104 

46.26 

46.12 

45.99 

45.85 

45.72 

45.58 

45.45 

45.31 

45.18 

45.04 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

B 


91 


TABLE     X. 

WEIGHT   OF  VAPOR,  IN   GRAINS   TROY, 

CONTAINED    IN    A  CUBIC    FOOT    OF    SATURATED  AIR,  UNDER   A    BAROMETRIC  PRESSURE  OF 
30  ENGLISH  INCHES,  AT  TEMPERATURES  BETWEEN  0°  AND  105°  FAHRENHEIT. 

THE  weight  of  a  litre  of  dry  air  at  the  temperature  of  zero  Centigrade,  or  32° 
Fahrenheit,  and  under  a  barometric  pressure  of  760  millimetres,  as  determined  by 
the  experiments  of  Regnault  (Memoir es  de  rinstitut,  Tom.  XXI.  p.  157),  and  corrected 
for  a  slight  error  of  computation  (see  above,  p.  38),  is  1.293223  grammes.  The  co- 
efficient of  expansion  of  the  air,  according  to  the  same  physicist,  is  0.00367  for  1° 
Centigrade  ;  and  the  theoretic  density  of  vapor  is  nearly  0.622,  or  f ,  of  that  of  the  air 
at  the  same  temperature  and  pressure.  Frorn  these  elements  the  weight  of  the  vapor 
contained  in  a  determined  volume,  of  air,  the  temperature  and  humidity  of  which  are 
known,  can  be  deduced. 

Reducing  these  values  to  English  measures,  1  litre  being  =  61.02705  cubic  inches, 
and  1  gramme  =  15.43208  grains  Troy,  we  have 

1.293223  grammes  =  19.9571208  grains, 
and 

61.027051  cubic  inches  :  19.9571208  grains  :  :  1  cubic  inch  :  0.32702  grain. 

Therefore,  the  weight  of  a  cubic  foot  of  dry  air,  at  32°  Fahrenheit,  under  a  pressure  of 
760  millimetres,  or  29.918  English  inches,  is  —  0.32702  grain  X  1728  =  565.0923 
grains  Troy.  Under  a  barometric  pressure  of  30  inches,  it  becomes 

X  565.0923  =  566.5691  grains. 


29.918 

The  coefficient  for  the  expansion  of  the  air  becomes  0.0020361  of  its  bulk  for  1° 
Fahrenheit. 

Now,  if  we  call 

t     =  the  temperature  of  the  air ; 

W  =  the  weight  of  vapor  in  a  saturated  air  at  the  temperature  t ; 

F   =  the  maximum  of  the  force  of  vapor  due  to  the  temperature  Z,  as  given 

in  the  tables ; 

then  the  weight  of  the  vapor  contained  in  a  cubic  foot  of  saturated  air  is  given  by  the 
formula 

W=0622  566.5691  grains  ,     F. 

1  +  0.002036  X  (t  —  32°)        30  ' 

from  which  the  values  in  Table  X.  have  been  computed.     The  forces  of  vapor  due  to 
the  temperatures  in  the  first  column  are  those  of  Regnault,  as  given  in  Table  VI. 
It  is  evident,  that,  in  order  to  find  the  weight  of  the  vapor  contained  in  the  air 

at  any  state  of  humidity  and  pressure,  it  suffices  to  substitute  for  the  normal  values  of 

F 

—  the  force  of  vapor  and  the  barometric  pressure  given  by  the  observation. 

30 

B  92 


X.    WEIGHT   OF  VAPOR,  IN  GRAINS   TROY, 


CONTAINED    IN    A    CUBIC    FOOT    OF    SATURATED    AIR,    AT    TEMPERATURES 


Temper- 
ature 
of 
Air, 
Fahren. 

Force 
of 
Vapor 
in  Eng. 
Inches. 

Weight 
of 
Vapor 
in 
Grains. 

Differ- 
ence. 

Temper- 
ature 
of 
Air, 
Fahren. 

Force 
of 
Vapor 
in  Eng. 
Inches. 

Weight 
of 
Vapor 
in 
Grains. 

Differ- 
ence. 

Temper- 
ature 
of 
Air, 
Fahren 

Force 
of 
Vapor 
in  Eng. 
Inches. 

Weight 
of 
Vapor 
in 
Grains. 

Differ- 
ence. 

0° 

0.043       0.545 

35° 

0.204 

2.379 

70° 

0.733 

7.992 

1 

0.045       0.569 

0.024 

36 

0.212 

2.469 

0.090 

71 

0.758 

8.252 

0.261 

2 

0.048 

0.595 

0.025 

37 

0.220 

2.563 

0.093 

72 

0.784 

8.521 

0.268 

3 

0.050 

0.621 

0.027 

33 

0.229 

2.659 

0.097 

73 

0.811 

8.797 

0.276 

4 

0.052 

0.649 

0.028 

39 

0.238 

2.759 

0.100 

74 

0.839 

9.081 

0.284 

0.029 

0.103 

0.291 

5 

0.055 

0.678 

40 

0.248 

2.862 

75 

0.868 

9.372 

6 

0.057 

0.708 

0.030 

41 

0.257 

2.967 

0.106 

76 

0.897 

9.670 

0.298 

7 

0.060 

0.739 

0.031 

42 

0.267 

3.076 

0.109 

77 

0.927 

9.977 

0.307 

8 

0.082 

0.772 

0.033 

43 

0.277 

3.189 

0.113 

78 

0.958 

10.292 

0.315 

9 

0.065 

0.806 

0.034 

44 

0.288 

3.306 

0.116 

79 

0.990 

10.616 

0.324 

0.035 

0.120 

0.332 

10 

0.063 

0.841 

45 

0.299 

3.426 

80 

1.023 

10.949 

0.037 

0.124 

0  342 

11 

0.072 

0.878 

46 

0.311 

3.550 

81 

1.057 

11.291 

12 

0.075 

0.916 

0.038 

47 

0.323 

3.679 

0.129 

82 

1.092 

11.643 

0.352 

13 

0.078 

0.957 

0.040 

48 

0.335 

3.811 

0.133 

83 

1.128 

12.005 

0.361 

14 

0.082 

0.999 

0.042 

49 

0.348 

3.948 

0.137 

84 

1.165 

12.376 

0.371 

0.044 

0.141 

0.380 

15 

0.086 

1.043 

50 

0.361 

4.089 

85 

1.203 

12.756 

16 

0.090 

1.090      °'°46 

51 

0.374 

4.234 

0.145 

86 

1.242 

13.146 

0.390 

17 

0.094 

1.133 

0.049 

52 

0.388 

4.383 

0.149 

87 

1.282 

13.546 

0.400 

18 

0.098 

1.190 

0.051 

53 

0.403 

4.537 

0.154 

88 

1.323 

13.957 

0.411 

19 

0.103 

1.243 

0.053 

54 

0.418 

4.696 

0.159 

89 

1.366 

14.378 

0.421 

0.055 

0.1G3 

0.432 

|     20 

0.103 

1.293 

55 

0.433 

4.860 

90 

1.410 

14.810 

0.057 

0.168 

0.443 

21 

0.113 

1.355 

56 

0.449 

5.028 

91 

1.455 

15.254 

22 

0.118 

1.415 

0.059 

57 

0.466 

5.202 

0.174 

92 

1.501 

15.709 

0.455 

23 

0.123 

1.476 

0.062 

58 

0.482 

5.381 

0.179 

93 

1.548 

16.176 

0.467 

24 

0.129 

1.540 

0.064 

59 

0.500 

5.566 

0.185 

94 

1.597 

16.654 

0.479 

0.066 

0.190 

0.491 

!     25 

0.135 

1.606 

60 

0.518 

5.756 

95 

1.647 

17.145 

0.068 

0.196 

i     26 

0.141 

1.674 

61 

0.537 

5.952 

96 

1.698 

17.648 

U#5U*> 

1     27 

0.147 

1.745 

0.070 

62 

0.556 

6.154 

0.202 

97 

1.751 

18.164 

0.516 

28 

0.153 

1.817 

0.073 

63 

0.576 

6.361 

0.208 

98 

1.805 

18.693 

0.529 

29 

0.160 

1.892 

0.075 

64 

0.596 

6.575 

0.214 

99 

1.861 

19.235 

0.542 

0.077 

0.220 

0.555 

30 

0.167 

1.969 

65 

0.617 

6.795 

100 

1.918 

19.790 

31 

0.174 

2.046 

0.077 

66 

0.639 

7.021 

0.226 

101 

1.977 

20.357 

0.567 

32 

0.181 

2.126 

0.080 

67 

0.662 

7.253 

0.232 

102 

2.037 

20.938 

0.582 

33 

0.188 

2.203      °'Uy" 

68 

0.685 

7.493 

0.239 

103 

2.099 

21.535 

0.596 

34 

0.196 

2.292      °'°84 

69 

0.708 

7.739 

0.246 

104 

2.162 

22.145 

0.611 

35 

0.204 

2.379      °'°81 

70 

0.733 

7.992 

0.253 

105 

2.227 

22.771 

0.625 

B 


93 


PRACTICAL     TABLES, 


IN 


ENGLISH    MEASURES, 


BASED    ON    THE   HYGROMETRICAL    CONSTANTS    ADOPTED    IN   THE 
GREENWICH    OBSERVATIONS. 


95 


TABLE 

OF 

THE  ELASTIC  FORCES  OF  AQUEOUS  VAPOR, 

UNDER    A    PRESSURE    OF    30    INCHES,  EXPRESSED    IN    ENGLISH    INCHES    OF   MERCURY  FOR 
TEMPERATURES  OF  FAHRENHEIT,  ADOPTED  IN  THE  GREENWICH  OBSERVATIONS. 


THIS  table  contains  the  values  of  the  elastic  force  of  vapor  for  temperatures  from 
0°  to  90°  Fahrenheit,  derived  from  Dalton's  experiments  by  Biot's  formula,  by 
Anderson,  and  published  in  Edinburgh  Encyclopedia ,  Art.  Hygrometry.  It  is  re- 
published,  without  the  last  decimal,  in  the  volumes  of  the  Greenwich  Magnetic  and 
Meteorological  Observations ,  and  on  it  are  based  the  various  hygrometrical  tables 
published  by  Mr.  Glaisher,  either  in  the  Greenwich  volumes,  or  separately,  most  of 
which  will  be  found  below,  Tables  XII.  to  XVII. 

Since  Dalton  published  his  experiments,  numerous  attempts  have  been  made  by 
various  skilful  physicists  to  determine  with  greater  accuracy  the  elastic  force  of 
vapor.  Dr.  lire  in  England,  Regnault  in  France,  and  Magnus  in  Germany,  deserve 
in  this  respect  a  special  notice. 

The  last  two  experimenters  having  arrived  simultaneously  at  results  nearly  iden- 
tical, and  their  experiments  having  been  conducted  with  all  the  care  that  modern 
science  requires,  and  the  means  that  it  can  secure,  their  determinations  seem  to  com- 
mand an  especial  confidence,  and  to  deserve  the  preference  over  all  others.  It  is, 
therefore,  much  to  be  regretted  that  the  usefulness  of  the  following  otherwise  so  valu- 
able tables,  the  formation  of  which  involved  so  much  labor,  is  in  a  measure  impaired 
by  the  fact  that  they  were  computed  from  elements  which  cannot  be  regarded  as 
the  most  reliable  we  now  possess. 


B  97 


XI. 


TABLE 


OF    THE 


ELASTIC    FORCE    OF    AQUEOUS    VAPOR, 


UNDER    A    BAROMETRIC    PRESSURE    OF    30    INCHES,   EXPRESSED    IN    ENGLISH   INCHES    OF 
MERCURY    FOR    TEMPERATURES    OF    FAHRENHEIT. 


FROM  THE  GREENWICH  OBSERVATIONS. 


Temper- 
ature 
Fahren- 
heit. 

o 
0 

Tenths  of  Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Eng.  In. 
0.061 

Eng.  In. 
0.061 

Eng.  In. 
0.062 

Eng.  In. 
0.062 

Eng.  In. 
0.062 

Eng.  In. 
0.062 

Eng.  In. 
0.063 

Eng.  In. 
0.063 

Eng.  In. 
0.063 

Eng.  In. 
0.063 

1 

0.064 

0.064 

0.064 

0.064 

0.065 

0.065 

0.065 

0.065 

0.066 

0.066 

2 

0.066 

0.066 

0.067 

0.067 

0.067 

0.067 

0.068 

0.068 

0.068 

0.068 

3 

0.069 

0.069 

0.069 

0.069 

0.070 

0.070 

0.070 

0.071 

0.071 

0.071 

4 

0.071 

0.072 

0.072 

0.072 

0.072 

0.073 

0.073 

0.073 

0.073 

0.074 

5 

0.074 

0.074 

0.075 

0.075 

0.075 

0.075 

0.076 

0.076 

0.076 

0.077 

6 

0.077 

0.077 

0.077 

0.078 

0.078 

0.078 

0.079 

0.079 

0.079 

0.080 

7 

0.080 

0.080 

0.080 

0.081 

0.081 

0.081 

0.082 

0.082 

0.082 

0.083 

8 

0.083 

0.083 

0.083 

0.084 

0.084 

0.084 

0.085 

0.085 

0.085 

0.086 

9 

0.086 

0.086 

0.087 

0.087 

0.087 

0.088 

0.088 

0.088 

0.089 

0.089 

10 

0.089 

0.090 

0.090 

0.090 

0.091 

0.091 

0.091 

0.092 

0.092 

0.092 

11 

0.093 

0.093 

0.093 

0.094 

0.094 

0.094 

0.095 

0.095 

0.096 

0.096 

12 

0.096 

0.097 

0.097 

0.097 

0.098 

0.098 

0.098 

0.099 

0.099 

0.099 

13 

0.100 

0.100 

0.101 

0.101 

0.101 

0.102 

0.102 

0.102 

0.103 

0.103 

14 

0.104 

0.104 

0.104 

0.105 

0.105 

0.106 

0.106 

0.106 

0.107 

0.107 

15 

0.108 

0.108 

0.108 

0.109 

0.109 

0.110 

0.110 

0.110 

0.111 

0.111 

16 

0.112 

0.112 

0.112 

0.113 

0.113 

0.114 

0.114 

0.115 

0.115 

0.115 

17 

0.116 

0.116 

0.117 

0.117 

0.118 

0.118 

0.118 

0.119 

0.119 

0.120 

18 

0.120 

0.121 

0.121 

0.121 

0.122 

0.122 

0.123 

0.123 

0.124 

0.124 

19 

0.125 

0.125 

0.126 

0.126 

0.126 

0.127 

0.127 

0.128 

0.128 

0.129 

20 

0.129 

0.130 

0.130 

0.131 

0.131 

0.132 

0.132 

0.133 

0.133 

0.134 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

B 


99 


ELASTIC    FORCE    OF    AQUEOUS    VAPOR. 
From  the  Greenwich  Observations. 


1 

Temper- 
ature 
Fahren- 
heit. 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6.          7. 

§. 

9. 

o 
21 

Eng.  In. 
0.134 

Eng.  In. 
0.135 

Eng.  In. 
0.135 

Eng.  In. 
0.136 

Eng.  In. 
0.136 

Eng.  In. 
0.137 

Eng.  In. 
0.137 

Eng.  In. 
0.138 

Eng.  In. 
0.133 

Eng.  In. 
0.139 

22 

0.139 

0.140 

0.140 

0.141 

0.141 

0.142 

0.142 

0.143 

0.143 

0.144 

23 

0.144 

0.145 

0.145 

0.146 

0.146 

0.147 

0.147 

0.148 

0.148 

0.149 

24 

0.150 

0.150 

0.151 

0.152 

0.152 

0.152 

0.153 

0.153 

0.154 

0.155 

25 

0.155 

0.156 

0.156 

0.157 

0.157 

0.158 

0.158 

0.159 

0.160 

0.160 

26 

0.161 

0.161 

0.162 

0.163 

0.163 

0.164 

0.164 

0.165 

0.165 

0.166 

27 

0.167 

0.167 

0.168 

0.168 

0.169 

0.170 

0.170 

0.171 

0.172 

0.172 

28 

0.173 

0.173 

0.174 

0.175 

0.175 

0.176 

0.177 

0.177 

0.178 

0.178 

29 

0.179 

0.180 

0.180 

0.181 

0.182 

0.182 

0.183 

0.184 

0.1S4 

0.185 

30 

0.186 

0.186 

0.187 

0.188 

0.188 

0.189 

0.190 

0.190 

0.191 

0.192 

31 

0.192 

0.193 

0.194 

0.194 

0.195 

0.196 

0.197 

0.197 

0.198 

0.198 

32 

0.199 

0.200 

0.201 

0.201 

0.202 

0.203 

0.204 

0.204 

0.205 

0.206 

33 

0.207 

0.207 

0.208 

0.209 

0.210 

0.210 

0.211 

0.212 

0.213 

0.213 

34 

0.214 

0.215 

0.216 

0.216 

0.217 

0.218 

0.219 

0.219 

0.220 

0.221 

35 

0.222 

0.223 

0.223 

0.224 

0.225 

0.226 

0.227 

0.227 

0.228 

0.229 

36 

0.230 

0.231 

0.231 

0.232 

0.233 

0.234 

0.235 

0.235 

0.236 

0.237 

37 

0.238 

0.239 

0.240 

0.240 

0.241 

0.242 

0.243 

0.244 

0.245 

0.246 

38 

0.246 

0.247 

0.248 

0.249 

0.250 

0.251 

0.252 

0.253 

0.253 

0.254 

39 

0.255 

0.256 

0.257 

0.258 

0.259 

0.260 

0.261 

0.262 

0.263 

0.263 

40 

0.264 

0.265 

0.266 

0.267 

0.268 

0.269 

0.270 

0.271 

0.272 

0.273 

41 

0.274 

0.275 

0.276 

0.277 

0.278 

0.279 

0.280 

0.281 

0.282 

0.282 

42 

0.283 

0.284 

0.285 

0.286 

0.287 

0.288 

0.289 

0.290 

0.291 

0.292 

43 

0.293 

0.295 

0.296 

0.297 

0.298 

0.299 

0.300 

0.301 

0.302 

0.303 

44 

0.304 

0.305 

0.306 

0.307 

0.308 

0.309 

0.310 

0.311 

0.312 

0.313 

45 

0.315 

0.316 

0.317 

0.318 

0.319 

0.320 

0.321 

0.322 

0.323 

0.324 

46 

0.326 

0.327 

0.328 

0.329 

0.330 

0.331 

0.332 

0.333 

0.335 

0.336    I! 

47 

0.337 

0.338 

0.339 

0.340 

0.342 

0.343 

0.344 

0.345 

0.346 

0.348   I! 

48 

0.349 

0.350 

0.351 

0.352 

0.354 

0.355 

0.356 

0.357 

0.358 

0.360 

49 

0.361 

0.362 

0.363 

0.365 

0.366 

0.367 

0.368 

0.370 

0.371 

0.372 

50 

0.373 

0.375 

0.376 

0.377 

0.379 

0.380 

0.381 

0.382 

0.383 

0.385 

•     51 

0.386 

0.388 

0.389 

0.390 

0.392 

0.393 

0.394 

0.396 

0.397 

0.398 

52 

0.400 

0.401 

0.402 

0.404 

0.405 

0.407 

0.408 

0.409 

0.411 

0.412    j 

53 

0.414 

0.415 

0.416 

0.418 

0.419 

0.421 

0.422 

0.423 

0.425 

0.426 

51 

0.428 

0.429 

0.431 

0.432 

0.434 

0.435 

0.437 

0.438 

0.440 

0.441     j 

55 

0.442 

0.444 

0.445 

0.447 

0.449 

0.450 

0.452 

0.453 

0.455 

0.456   IJ 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

100 


ELASTIC    FORCE    OF    AQUEOUS    VAPOR. 
From  the  Greenwich  Observations. 


Tenths  of  Degrees. 

Temper- 

ature 

Fahren- 

heit. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

56 

0.458 

0.459 

0.461 

0.462 

0.464 

0.465 

0.467 

0.469 

0.470 

0.472 

57 

0.473 

0.475 

0.476 

0.478 

0.480 

0.481 

0.483 

0.485 

0.486 

0.488 

58 

0.489 

0.491 

0.493 

0.494 

0.496 

0.498 

0.499 

0.501 

0.503 

0.504 

59 

0.506 

0.508 

0.509 

0.511 

0.513 

0.515 

0.516 

0.518 

0.520 

0.521 

60          0.523 

0.525 

0.527 

0.528 

0.530 

0.532 

0.534 

0.536 

0.537 

0.539 

61          0.541 

0.543 

0.544 

0.546 

0.548 

0.550 

0.552 

0.554 

0.555 

0.55^ 

62          0.559 

0.561 

0.563 

0.565 

0.567 

0.568 

0.570 

0.572 

0.574 

0.576 

63 

0.578 

0.580 

0.582 

0.584 

0.586 

0.588 

0.590 

0.591 

0.593 

0.595 

64 

0.597 

0.599 

0.601 

0.603 

0.605 

0.607 

0.609 

0.611 

0.613 

0.615 

65 

0.617 

0.619 

0.621 

0.623 

0.626 

0.628 

0.630 

0.632 

0.634 

0.636 

66 

0.638 

0.640 

0.642 

0.644 

0.646 

0.648 

0.651 

0.653 

0.655 

0.657 

67 

0.659 

0.661 

0.664 

0.666 

0.668 

0.670 

0.672 

0.674 

0.677 

0.679 

68 

0.681 

0.684 

0.686 

0.688 

0.690 

0.692 

0.695 

0.697 

0.699 

0.701 

69 

0.704 

0.706 

0.708 

0.711 

0.713 

0.715 

0.717 

0.720 

0.722 

0.725 

70 

0.727 

0.729 

0.732 

0.734 

0.736 

0.739 

0.741 

0.744 

0.746 

0.748 

71 

0.751 

0.753 

0.756 

0.758 

0.761 

0.763 

0.766 

0.768 

0.771 

0.773 

72 

0.776 

0.778 

0.781 

0.783 

0.785 

0.787 

0.790 

0.792 

0.795 

0.797 

73 

0.801 

0.803 

0.806 

0.809 

0.811 

0.814 

0.817 

0.819 

0.822 

0.824 

74 

0.827 

0.830 

0.832 

0.835 

0.838 

0.840 

0.843 

0.846 

0.849 

0.851 

75 

0.854 

0.857 

0.860 

0.862 

0.865 

0.868 

0.871 

0.873 

0.876 

0.879 

76 

0.882 

0.885 

0.887 

0.890 

0.893 

0.896 

0.899 

0.902 

0.905 

0.908 

77 

0.910 

0.913 

0.916 

0.919 

0.922 

0.925 

0.928 

0.931 

0.934 

0.937 

78 

0.940 

0.943 

0.946 

0.949 

0.952 

0.955 

0.958 

0.961 

0.964 

0.967 

79 

0.970 

0.973 

0.976 

0.979 

0-983 

0.9S6 

0.989 

0.992 

0.995 

0.998 

80 

1.001 

1.005 

1.008 

1.011 

1.014 

1.017 

1.021 

1.024 

1.027 

1.030 

81 

1.034 

1.037 

1.040 

1.043 

1.047 

1.050 

1.053 

1.057 

1.060 

1.063 

82 

1.067 

1.069 

1.073 

1.077 

1.080 

1.083 

1.087 

1.090 

1.094 

1.097 

83 

1.101 

1.104 

1.108 

1.111 

1.114 

1.118 

l.lfil 

1.125 

1.129 

1.132 

84 

1.136 

1.139 

1.143 

1.146 

1.150 

1.153 

1.157 

1.160 

1.164 

1.167 

85 

1.171 

1.175 

1.178 

1.182 

1.186 

1.190 

1.193 

1.197 

1.201 

1.205 

86 

1.209 

1.212 

1.216 

1.220 

1.224 

.228 

1.232 

1.235 

1.239 

1.243 

87 

1.247 

1.251 

1.255 

1.258 

1.262 

.266 

1.270 

1.274 

.1.278 

1.282 

88 

1.286 

1.290 

1.294 

1.298 

1.302 

.306 

1.310 

1.314 

1.318 

1.322 

89 

1.326 

1.330 

1.335 

1.339 

1.343 

.347 

1.351 

1.355 

1.359 

1.364 

90 

1.368 

1.372 

1.376 

1.381 

1.385 

.389 

1.393 

1.397 

1.402 

1.406 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

B 


101 


PSYCHROMETRICAL  TABLE, 


GIVING-     THE     TEMPERATURE    OF    THE     DEW-POINT,    THE     FORCE     AND     THE     WEIGHT    OF 

VAPOR  IN  THE    ATMOSPHERE,  AND    ITS    RELATIVE   HUMIDITY,  DEDUCED   FROM  THE 
INDICATIONS  OF  THE  PSYCHROMETER,  OR  DRY  AND  WET  BULB  THERMOMETERS. 

BY  JAMES  GLAISHER. 

THIS  elaborate  table,  first  published  in  London,  in  1847,  in  pamphlet  form,  by  J. 
Glaisher,  of  the  Royal  Observatory  at  Greenwich,  is  based  on  the  tables  of  elastic 
forces  of  vapor  deduced  from  Dalton's  experiments,  and  given  above,  Table  XI. 

The  weight  of  a  cubic  foot  of  dry  air  at  32°  Fahrenheit,  and  under  the  barometric 
pressure  of  30  inches,  which  has  been  adopted  by  Glaisher,  and  from  which  the 
weight  of  vapor  in  a  cubic  foot  of  air  is  derived,  is  the  mean  of  the  determinations 
obtained  by  Shuckburgh  and  by  Biot  and  Arago,  which  is  563.2154  grains  Troy; 
563  being  the  number  actually  used  in  the  calculations.  See  Preface  to  the  Table, 
p.  13,  and  also  the  Greenwich  Meteorological  Observations  for  1842,  p.  xlvi. 

The  coefficient  of  the  expansion  of  air  which  has  been  employed  is  that  deter- 
mined by  the  experiments  of  Gay-Lussac,  according  to  which  the  air  expands  0.00375 
of  its  bulk  for  1°  Centigrade,  or  ^-j  for  1°  Fahrenheit. 

All  these  values,  as  may  be  seen  by  comparing  Tables  VI.  and  XI.  of  the  elastic 
forces,  and  also  page  92,  materially  differ  from  those  more  recently  determined  with 
great  care  by  Regnault,  and  on  which  are  based  the  Psychrometrical  Tables  given 
above,  page  50  et  seq.  This  will  account  for  the  no  inconsiderable  differences  often 
found  between  the  results  in  the  two  tables  derived  from  the  same  data.  A  few 
examples,  taken  from  various  parts  of  the  tables,  may  be  given  here,  in  order  to 
enable  the  meteorologist  to  judge  of  the  amount  of  the  discrepancies  which  may  occur 
in  the  results  when  computed  from  different  hygrometrical  constants. 

1.  Suppose  the  temperature  of  the  air  indicated  by  the  dry  thermome- 

ter to  be  =  10°  F. 

The  temperature  of  evaporation  indicated  by  the  wet  thermometer          =    9°  F. 

Difference  1°  F. 

Then,  Glaisher's  table  gives, 

The  Force  of  Vapor          =  0.065  inch. 

The  Relative  Humidity     =  0.730 
Guyot's  table  gives, 

The  Force  of  Vapor          =  0.054  inch. 

The  Relative  Humidity     =  0.791 
B  102 


PSYCHROMETRICAL    TABLE. 

2.  By  observation  we  have, 

Dry  Thermometer       =  50°  F. 

Wet  Thermometer      =  40°  F. 

Difference     =   10°  F. 

Then,  by  Glaisher's  table,  we  find, 

Force  of  Vapor  =;  0.186  inch. 

Relative  Humidity  =  0.495 
And  by  Guyot's  table,  we  find, 

Force  of  Vapor  =  0.117  inch. 

Relative  Humidity  =  0.322 

3.  The  reading  of  the 

Dry  Thermometer  is  =  90°  F. 

Wet  Thermometer  is  =  70°  F. 

Difference  =  20°  F. 

By  Glaisher's  table  we  have, 

Force  of  Vapor  =  0.523  inch. 

Relative  Humidity  =  0.381 
And  by  Guyot's  table, 

Force  of  Vapor  =  0.464  inch. 

Relative  Humidity  =  0.329 

The  temperatures  of  the  Dew-Point,  given  in  Glaisher's  tables,  have  been  com- 
puted by  means  of  the  empirical  factors  given  below,  page  140,  and  in  the  manner 
there  described.  See  Preface  to  the  Table,  page  11. 


ARRANGEMENT  OF  THE  TABLE. 

In  the  first  two  columns,  at  the  left,  are  found  the  indications,  in  degrees  of  Fah- 
renheit, of  the  dry  and  wet  bulb  thermometers.  In  the  following  columns,  in  their 
order,  and  opposite  to  each  of  the  temperatures  of  the  wet  thermometer,  are  given 
the  temperature  of  the  dew-point ;  the  force  of  vapor,  in  English  inches ;  the  weight 
of  vapor,  in  grains,  contained  in  a  cubic  foot  of  air ;  the  amount  of  the  same  required 
for  saturation  ;  and  the  relative  humidity  in  thousandths,  corresponding  to  the  differ- 
ence of  temperature  between  the  two  thermometers.  The  second  half  of  the  page, 
at  the  right,  furnishes,  in  seven  columns,  the  weight,  in  grains,  of  a  cubic  foot  of  air, 
under  various  barometric  pressures  from  28  to  31  inches,  and  in  the  different  hygro- 
metric  conditions  indicated  by  the  differences  of  the  two  thermometers.  These 
numbers  have  been  computed  in  the  manner  described  below,  page  142. 

The  range  of  the  table  extends  from  10°  to  90°  of  the  dry  thermometer,  or  of 
the  temperature  of  the  air.  From  10°  to  34°  Fahrenheit  the  results  are  calculated 
for  every  second,  third,  and  fifth  of  a  degree  of  the  wet  thermometer,  and  for  ex- 
treme differences  of  the  temperature  of  evaporation  ranging  from  2°  to  5°  below  the 
temperature  of  the  air.  From  34°  to  90°  the  results  are  given  only  for  every  full 
degree  of  the  wet  thermometer,  and  for  extreme  differences  gradually  increasing 

B  103 


PSYCHROMETRICAL    TABLE. 

from  5°  to  27°.  This  range  falls  short  of  the  wants  of  the  extreme  climate  of  North 
America,  where  temperatures  above  90°  and  far  below  10°  are  of  usual  occurrence 
over  a  great  portion  of  the  continent.  The  same  may  be  said  of  the  range  of  the 
differences  between  the  two  thermometers  in  the  first  part  of  the  table.  The  double 
interpolation  for  the  fractions  of  degrees  of  both  thermometers  being  rather  too  large 
to  be  neglected,  its  application  becomes  inconvenient. 


USE  OF  THE  TABLE. 

Enter  the  table  with  the  observed  temperatures  of  the  dry  and  wet  bulb  thermom- 
eters. On  the  same  line  as  the  last,  and  in  their  appropriate  columns,  the  results 
deduced  from  these  data  will  be  found. 

Example. 
The  observation  has  given, 

Temperature  of  the  air  by  the  dry  thermometer  —  62°  F. 

Temperature  of  evaporation  by  the  wet-bulb  thermometer  =  53°  F. 
Page  129,  find  in  the   first  column,  headed  Reading  of  the  Dry  Thermometer,  the 
temperature  of  62°,  and  in  the  second,  that  of  the  wet,  53°.     On  the  line  beginning 
with  53°  are  found,  in  their  respective  columns,  the  results   deduced  from   these 
data,  viz. :  — 

The  temperature  of  the  Dew-point  —  46°.7  F. 

The  force  of  vapor  in  the  air  =  0.333  inch. 

The  weight  of  vapor  in  a  cubic  foot  of  air  =  3.72    grains. 

The  amount  of  vapor  required  for  saturation  =  2.53    grains. 

The  relative  humidity  in  thousandths  =  0.595 


B  104 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

in. 

28.O 

in. 

28.5 

in. 

29.0 

in. 

29.5 

in. 

30.0 

in. 

30.5 

in. 

31.0 

Dry. 

Wet. 

0 

10 

o 
10.0 

o 
10.0 

in. 
0.089 

gr- 
1.11 

gr. 
0.00 

1.000 

gr. 
550.1 

gr- 
560.0 

gr. 
569.8 

gr- 
579.6 

gr- 
589.4 

gr. 
599.2 

gr. 
609.0 

9.8 

8.3 

0.084 

1.05 

0.06 

0.946 

550.2 

560.1 

569.9 

579.7 

589.5 

599.3 

609.1 

9.6 

6.6 

0.079 

0.98 

0.13 

0.883 

550.2 

560.1 

569.9 

579.7 

589.5 

599.3 

609.1 

9.4 

4.9 

0.074 

0.92 

0.19 

0.829 

550.2 

560.1 

569.9 

579.7 

589.5 

599.3 

609.1 

9.2 

3.2 

0.069 

0.86 

0.25 

0.775 

550.3 

560.2 

570.0 

579.8 

589.6 

599.4 

609.2 

9.0 

1.5 

0.065 

0.81 

0.30 

0.730 

550.3 

560.3 

570.0 

579.8 

589.6 

599.4 

609.3 

11 

11.0 

11.0 

0.093 

1.15 

0.00 

1.000 

548.9 

558.7 

568.5 

578.3 

588.1 

597.9 

607.7 

10.8 

9.3 

0.087 

1.08 

0.07 

0.939 

548.9 

558.7 

568.5 

578.3 

588.1 

597.9 

607.7 

10.6 

7.6 

0.082 

1.02 

0.13 

0.887 

549.0 

558.8 

568.6 

578.4 

588.2 

598.0 

607.8 

10.4 

5.9 

0.077 

0.96 

0.19 

0.835 

549.0 

558.8 

568.6 

578.4 

588.2 

598.0 

607.8 

10.2 
10.0 

4.2 

2.5 

0.072 
0.06? 

0.90 
0.84 

0.25 
0.31 

0.783 
0.731 

549.0 
549.1 

558.8 
558.9 

568.6 
568.7 

578.4 
578.6 

588.2 
588.3 

598.0 
598.1 

607.8 
607.9 

9.8 

0.8 

0.063 

0.78 

0.37 

0.679 

549.1 

558.9 

568.7 

578.6 

588.3 

598.1* 

607.9 

12 

12.0 

12.0 

0.096 

1.19 

0.00 

1.000 

547.7 

557.5 

567.2 

577.0 

586.8 

596.6 

606.4 

11.8 

10.3 

0.090 

1.12 

0.07 

0.942 

547.7 

557.5 

567.2 

577.0 

586.8 

596.6 

606.4 

11.6 

8.6 

0.085 

1.05 

0.14 

0.883 

547.8 

557.6 

567.3 

577.1 

586.9 

596.7 

606.5 

11.4 

6.9 

0.080 

0.99 

0.20 

0.832 

547.8 

557.6 

567.3 

577.1 

586.9 

596.7 

606.5 

11.2 

5.2 

0.075 

0.93 

0.26 

0.782 

547.8 

557.6 

567.3 

577.1 

586.9 

596.7 

606.5 

11.0 

3.5 

0.070 

0.87 

0.32 

0.731 

547.9 

557.7 

567.4 

577.2 

587.0 

596.8 

606.6 

10.8 

1.8 

0.066 

0.81 

0.38 

0.681 

547.9 

557.7 

567.4 

577.2 

587.0 

596.8 

606.6 

10.6 

0.1 

0.061 

0.76 

0.43 

0.639 

547.9 

557.7 

567.4 

577.2 

587.0 

596.8 

606.6 

13 

13.0 

13.0 

0.100 

1.24 

0.00 

1.000 

546.5 

556.3 

566.0 

575.8 

585.5 

595.3 

605.0 

12.8 

11.3 

0.094 

1.16 

0.08 

0.936 

546.5 

556.3 

566.0 

575.8 

585.5 

595.3 

605.0 

12.6 

9.6 

0.088 

1.08 

0.16 

0.871 

546.6 

556.4 

566.1 

575.9 

585.6 

595.4 

605.1 

12.4 

7.9 

0.083 

1.02 

0.22 

0.823 

546.7 

556.5 

566.2 

576.0 

585.7 

595.5 

605.2 

12.2 

6.2 

0.077 

0.97 

0.27 

0.783 

546.7 

556.5 

566.2 

576.0 

5S5.7 

595.5 

605.2 

12.0 

4.5 

0.073 

0.91 

0.33 

0.734 

546.7 

556.5 

566.2 

576.0 

585.7 

595.5 

605.2 

11.8 

2.8 

0.068 

0.84 

0.40 

0.678 

546.8 

556.6 

566.3 

576.1 

585.8 

595.6 

605.3 

11.6 

1.1 

0.064 

0.79 

0.45 

0.637 

546.8 

556.6 

566.3 

576.1 

585.8 

595.6 

605.3 

14 

14.0 

14.0 

0.104 

1.28 

0.00 

1.000 

545.3 

555.0 

564.7 

574.4 

584.2 

594.0 

603.7 

13.8 

12.3 

0.097 

1.20 

0.08 

0.938 

545.3 

555.0 

564.7 

574.4 

584.2 

594.0 

603.7 

13.6 

10.6 

0.091 

1.12 

0.16 

0.875 

545.4 

555.1 

564.8 

574.5 

584.3 

594.1 

603.8 

13.4 

8.9 

0.086 

1.06 

0.22 

0.828 

545.4 

555.1 

564.8 

574.5 

584.3 

594.1 

603.8 

13.2 

7.2 

0.080 

1.00 

0.28 

0.782 

545.4 

555.1 

564.8 

574.5 

584.3 

594.1 

603.8 

13.0 

5.5 

0.075 

0.93 

0.35 

0.727 

545.5 

555.2 

564.9 

574.6 

584.4 

594.2 

603.9 

12.8 

3.8 

0.071 

0.87 

0.41 

0.680 

545.5 

555.2 

564.9 

574.6 

584.4 

594.2 

603.9 

12.6 

2.1 

0.066 

0.82 

0.46 

0.641 

545.6 

555.3 

565.0 

574.7 

584.5 

594.2 

603.9 

15 

15.0 

15.0 

0.108 

1.32 

0.00 

1.000 

544.0 

553.8 

563.5 

573.2 

582.9 

592.6 

602.3 

14.8 

13.3 

0.101 

1.24 

0.08 

0.940 

544.0 

553.8 

563.5 

573.2 

582.9 

592.6 

602.3 

14.6 

11.6 

0.095 

1.16 

0.16 

0.879 

544.1 

553.9 

563.6 

573.3 

583.0 

592.7 

602.4 

14.4 

9.9 

0.089 

1.10 

0.22 

0.833 

544.1 

553.9 

563.6 

573.3 

583.0 

592.7 

602.4 

14.2 

8.2 

0.083 

1.04 

0.28 

0.788 

544.2 

554.0 

563.7 

573.4 

583.1 

592.8 

602.5 

14.0 

6.5 

0.078 

0.97 

0.35 

0.735 

544.2 

554.0 

563.7 

573.4 

583.1 

592.8 

602.5 

13.8 

4.8 

0.073 

0.90 

0.42 

0.682 

544.2 

554.0 

563.7 

573.4 

583.1 

592.8 

602.5 

13.6 

3.1 

0.069 

0.85 

0.47 

0.644 

544.3 

554.1 

563.8 

573.5 

583.2 

592.9 

602.6 

B 


105 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Cemp. 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

in. 

28.0 

in. 
28.5 

in. 

29.O 

in. 

29.5 

in. 
30.0 

in. 

30.5 

in. 

31.0 

Dry. 

Wet. 

0 

16 

0 

16.0 

o 
16.0 

in. 
0.112 

gr. 
1.37 

gr. 
0.00 

1.000 

gr. 
542.8 

gr- 
552.5 

gr. 
562.2 

gr. 
571.9 

gr. 
581.6 

gr. 
591.3 

gr- 
601.0 

15.8 

14.3 

0.105 

1.29 

0.08 

0.942 

542.9 

552.6 

562.3 

572.0 

581.7 

591.4 

601.1 

15.6 

12.6 

0.098 

1.21 

0.16 

0.883 

542.9 

552.6 

562.3 

572.0 

581.7 

591.4 

601.1 

15.4 

10.9 

0.092 

1.14 

0.23 

0.832 

543.0 

552.7 

562.4 

572.1 

581.8 

591.5 

601.2 

15.2 

9.2 

0.087 

1.07 

0.30 

0.781 

543.0 

552.7 

562.4 

572.1 

581.8 

591.5 

601.2 

15.0 

7.5 

0.081 

1.00 

0.37 

0.730 

543.0 

552.7 

562.4 

572.1 

581.8 

591.5 

601.2 

14.8 

5.8 

0.076 

0.94 

0.43 

0.686 

543.1 

552.8 

562.5 

572.1 

581.9 

591.6 

601.3 

14.6 

4.1 

0.072 

0.88 

0.49 

0.643 

543.1 

552.8 

562.5 

572.1 

581.9 

591.6 

601.3 

17 

17.0 

17.0 

0.116 

1.41 

0.00 

1.000 

541.3 

551.0 

560.8 

570.5 

580.1 

589.8 

599.4 

16.8 

15.3 

0.109 

1.33 

0.08 

0.943 

541.3 

551.0 

560.8 

570.5 

580.1 

589.8 

599.4 

16.6 

13.6 

0.102 

1.25 

0.16 

0.887 

541.4 

551.1 

560.9 

570*6 

580.2 

589.9 

599.5 

16.4 

11.9 

0.096 

1.17 

0.24 

0.830 

541.4 

551.1 

560.9 

570.6 

580.2 

589.9 

599.5 

16.2 

10.2 

0.090 

1.10 

0.31 

0.780 

541.5 

551.2 

561.0 

570.7 

580.3 

590.0 

599.6 

16.0 

8.5 

0.084 

1.03 

0.38 

0.730 

541.5 

551.2 

561.0 

570.7 

580.3 

590.0 

599.6 

15.8 

6.8 

0.079 

0.97 

0.44 

0.688 

541.5 

551.2 

561.0 

570.7 

580.3 

590.0 

599.6 

15.6 

5.1 

0.074 

0.91 

0.50 

0.646 

541.6 

551.3 

561.1 

570.8 

580.4 

590.1 

599.7 

18 

18.0 

18.0 

0.120 

1.47 

0.00 

1.000 

540.5 

550.2 

559.8 

569.5 

579.1 

588.8 

598.4 

17.8 

16.3 

0.113 

1.38 

0.09 

0.939 

540.5 

550.2 

559.8 

569.5 

579.1 

588.8 

598.4 

17.6 

14.6 

0.106 

1.29 

0.18 

0.878 

540.6 

550.3 

559.9 

569.6 

579.2 

588.9 

598.5 

17.4 

12.9 

0.099 

1.21 

0.26 

0.824 

540.6 

550.3 

559.9 

569.6 

579.2 

588.9 

598.5 

17.2 

11.2 

0.093 

1.14 

0.33 

0.776 

540.7 

550.4 

560.0 

569.7 

579.3 

589.0 

598.6 

17.0 

9.5 

0.088 

1.07 

0.40 

0.728 

540.7 

550.4 

560.0 

569.7 

579.3 

589.0 

598.6 

16.8 

7.8 

0.082 

1.01 

0.46 

0.688 

540.7 

550.5 

560.1 

569.8 

579.3 

589.0 

598.6 

16.6 

6.1 

0.077 

0.95 

0.52 

0.647 

540.8 

550.6 

560.2 

569.9 

579.4 

589.1 

598.7 

19 

19.0 

19.0 

0.125 

1.52 

0.00 

1.000 

539.3 

548.9 

558.5 

568.2 

577.8 

587.5 

597.1 

18.8 

17.3 

0.117 

1.43 

0.09 

0.941 

539.3 

548.9 

558.5 

568.2 

577.8 

587.5 

597.1 

18.6 

15.6 

0.110 

1.34 

0.18 

0.882 

539.4 

549.0 

558.6 

568.3 

577.9 

587.6 

597.2 

18.4 

13.9 

0.103 

1.26 

0.26 

0.829 

539.4 

549.0 

558.6 

568.3 

577.9 

587.6 

597.2 

18.2 

12.2 

0.097 

1.18 

0.34 

0.776 

539.5 

549.1 

558.7 

568.4 

578.0 

587.7 

597.3 

18.0 

10.5 

0.091 

1.11 

0.41 

0.730 

539.5 

549.1 

558.7 

568.4 

578.0 

587.7 

597.3 

17.8 

8.8 

0.085 

1.04 

0.48 

0.684 

539.6 

549.2 

558.8 

568.5 

578.1 

587.8 

597.4 

17.6 

7.1 

0.080 

0.98 

0.54 

0.645 

539.6 

549.2 

558.8 

568.5 

578.1 

587.8 

597.4 

20 

20.0 

20.0 

0.129 

1.58 

0.00 

1.000 

538.1 

547.7 

557.3 

566.9 

576.5 

586.1 

595.7 

19.8 

18.3 

0.121 

1.48 

0.10 

0.937 

538.2 

547.8 

557.4 

567.0 

576.6 

586.2 

595.8 

19.6 

16.6 

0.114 

1.38 

0.20 

0.874 

538.3 

547.9 

557.5 

567.1 

576.7 

586.3 

595.9 

19.4 

14.9 

0.107 

1.30 

0.28 

0.823 

538.3 

547.9 

557.5 

567.1 

576.7 

586.3 

595.9 

19.2 

13.2 

0.101 

1.23 

0.35 

0.779 

538.3 

547.9 

557.5 

567.1 

576.7 

586.3 

595.9 

19.0 

11.5 

0.094 

1.15 

0.43 

0.728 

538.4 

548.0 

557.6 

567.2 

576.8 

586.4 

596.0 

18.8 

9.8 

0.089 

1.08 

0.50 

0.684 

538.4 

548.0 

557.6 

567.2 

576.8 

586.4 

596.0 

18.6 

8.1 

0.083 

1.01 

0.57 

0.639 

538.5 

548.1 

557.7 

567.3 

576.9 

586.5 

596.1 

18.4 

6.4 

0.078 

0.95 

0.63 

0.601 

538.5 

548.1 

557.7 

567.3 

576.9 

586.5 

596.1 

B 


106 


PSYCHROMETRICAL   TABLES. 


Reading 
of  Ther- 

Force 

Weight 
of  Vapor 

Hu- 

Weight in  Grains  of  a  Cubic  Foot  of  Air. 

mometer, 
Fahr. 

of 
Dew- 
Point, 

of 
Yapor 
in 

In  a 

Cubic 

Reqd. 
for 
Sat'n. 

midity, 
Satura- 
tion = 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

Wet. 

Fahr. 

English 
Inches. 

Foot  of 
Air. 

ofaCu- 
bic  Ft. 
of  Air. 

1.000. 

in. 

28.0 

in. 
28.5 

in. 

29.0 

in. 

29.5 

in. 

30.0 

in. 

30.5 

in. 

31.0 

o 

o 

o 

in. 

gr. 

gr- 

gr. 

gr. 

gr. 

gr. 

gr. 

gr. 

gr- 

21 

21.0 

21.0 

0.134 

.63 

0.00 

1.000 

537.0 

546.6 

556.1 

565.7 

575.3 

584.9 

594.5 

20.8 

19.3 

0.126 

.53 

0.10 

0.939 

537.0 

546.6 

556.1 

565.7 

575.3 

584.9 

594.5 

20.6 

17.6 

0.118 

.44 

0.19 

0.884 

537.1 

546.7 

556.2 

565.8 

575.4 

585.0 

594.6 

20.4 

15.9 

0.111 

.36 

0.27 

0.835 

537.1 

546.7 

556.2 

565.8 

575.4 

585.0 

594.6 

20.2 

14.2 

0.104 

.28 

0.35 

0.785 

537.2 

546.8 

556.3 

565.9 

575.5 

585.1 

594.7 

20.0 

12.5 

0.098 

.20 

0.43 

0.736 

537.2 

546.8 

556.3 

565.9 

575.5 

585.1 

594.7 

19.8 

10.8 

0.092 

.12 

0.51 

0.687 

537.3 

546.9 

556.4 

566.0 

575.6 

585.2 

594.8 

19.6 

9.1 

0.086 

.05 

0.58 

0.644 

537.3 

546.9 

556.4 

566.0 

575.6 

585.2 

594.8 

19.4 

7.4 

0.081 

0.99 

0.64 

0.607 

537.3 

546.9 

556.4 

566.0 

575.6 

585.2 

594.8 

22 

22.0 

22.0 

0.139 

1.69 

0.00 

1.000 

535.7 

545.3 

554.9 

564.5 

574.0 

583.6 

593.1 

21.8 

20.3 

0.131 

1.59 

0.10 

0.941 

535.8 

545.4 

555.0 

564.6 

574.1 

583.7 

593.2 

21.6 

18.6 

0.123 

1.49 

0.20 

0.882 

535.8 

545.4 

555.0 

564.6 

574.1 

583.7 

593.2 

21.4 

16.9 

0.115 

1.40 

0.29 

0.828 

535.9 

545.5 

555.1 

564.7 

574.2 

583.8 

593.3 

21.2 

15.2 

0.108 

1.31 

0.38 

0.775 

535.9 

545.5 

555.1 

564.7 

574.2 

583.8 

593.3 

21.0 

13.5 

0.102 

1.23 

0.46 

0.728 

536.0 

545.6 

555.2 

564.8 

574.3 

583.9 

593.4 

20.8 

11.8 

0.096 

1.16 

0.53 

0.686 

536.0 

545.6 

555.2 

564.8 

574.3 

583.9 

593.4 

20.6 

10.1 

0.090 

1.09 

0.60 

0.645 

536.1 

545.7 

555.3 

564.9 

574.4 

584.0 

593.5 

20.4 

8.4 

0.084 

1.02 

0.67 

0.604 

536.1 

545.7 

555.3 

564.9 

574.4 

584.0 

593.5 

20.2 

6.7 

0.079 

0.96 

0.73 

0.568 

536.1 

545.7 

555.3 

564.9 

574.4 

584.0 

593.5 

23 

23.0 

23.0 

0.144 

.75 

0.00 

1.000 

534.6 

544.2 

553.7 

563.3 

572.8 

582.4 

591.9 

22.8 

21.3 

0.136 

.65 

0.10 

0.943 

534.6 

544.2 

553.7 

563.3 

572.8 

582.4 

591.9 

22.6 

19.6 

0.127 

.55 

0.20 

0.886 

534.7 

544.3 

553.8 

563.4 

572.9 

582.5 

592.0 

22.4 

17.9 

0.120 

.45 

0.30 

0.829 

534.7 

544.3 

553.8 

563.4 

572.9 

582.5 

592.0 

22.2 

16.2 

0.112 

.36 

0.39 

0.777 

534.8 

544.4 

553.9 

563.5 

573.0 

582.6 

592.1 

22.0 

14.5 

0.106 

1.28 

0.47 

0.731 

534.8 

544.4 

553.9 

563.5 

573.0 

582.6 

592.1 

21.8 

12.8 

0.099 

1.21 

0.54 

0.691 

534.9 

544.5 

554.0 

563.6 

573.1 

582.7 

592.2 

21.6 

11.1 

0.093 

1.13 

0.62 

0.646 

534.9 

544.5 

554.0 

563.6 

573.1 

582.7 

592.2 

21.4 

9.4 

0.087 

1.06 

0.69 

0.606 

535.0 

544.6 

554.1 

563.7 

573.2 

582.8 

592.3 

21.2 

7.7 

0.082 

1.00 

0.75 

0.571 

535.0 

544.6 

554.1 

563.7 

573.2 

582.8 

592.3 

24 

24.0 

24.0 

0.150 

1.81 

0.00 

1.000 

533.4 

542.9 

552.4 

562.0 

571.5 

581.1 

590.6 

23.8 

22.5 

0.142 

1.72 

0.09 

0.951 

533.5 

543.0 

552.5 

562.1 

571.6 

581.2 

590.7 

23.6 

21.1 

0.135 

1.63 

0.18 

0.901 

533.5 

543.1 

552.5 

562.1 

571.6 

581.2 

590.7 

23.4 

19.6 

0.127 

1.55 

0.26 

0.856 

533.6 

543.2 

552.6 

562.2 

571.7 

581.3 

590.8 

23.2 

18.2 

0.121 

1.46 

0.35 

0.807 

533.6 

543.2 

552.6 

562.2 

571.7 

581.3 

590.8 

23.0 

16.7 

0.115 

1.38 

0.43 

0.762 

533.7 

543.3 

552.7 

562.3 

571.8 

581.4 

590.9 

22.8 

15.2 

0.108 

1.31 

0.50 

0.724 

533.7 

543.3 

552.7 

562.3 

571.8 

581.4 

590.9 

22.6 

13.8 

0.103 

1.24 

0.57 

0.685 

533.7 

543.3 

552.7 

562.3 

571.8 

581.4 

590.9 

22.4 

12.3 

0.097 

1.18 

0.63 

0.652 

533.8 

543.4 

552.8 

562.4 

571.9 

581.5 

591.0 

22.2 

10.8 

0.091 

1.12 

0.69 

0.634 

533.8 

543.4 

552.8 

562.4 

571.9 

581.5 

591.0 

107 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

T>~~,1 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
Foot  of 
Air. 

jagnguu 

for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

0 

25 

Wet. 

in. 

28.0 

in. 

28.5 

in. 

29.O 

in. 

29.5 

in. 
30.0 

in. 

3O.5 

in. 

31.O 

o 
25.0 

o 
25.0 

in. 
0.155 

gr- 
1.87 

gr. 
0.00 

1.000 

gr. 
532.3 

gr. 
541.8 

gr. 
551.3 

gr. 
560.8 

gr- 
570.3 

gr. 
579.8 

gr- 
589.3 

24.8 

23.7 

0.148 

1.78 

0.09 

0.952 

532.3 

541.8 

551.3 

560.8 

570.3 

579.8 

589.3 

24.6 

22.4 

0.141 

1.70 

0.17 

0.909 

532.4 

541.9 

551.4 

560.9 

570.4 

579.9 

589.4 

24.4 

21.2 

0.135 

1.62 

0.25 

0.867 

532.4 

541.9 

551.4 

560.9 

570.4 

579.9 

589.4 

24.2 

19.9 

0.129 

1.55 

0.32 

0.829 

532.4 

541.9 

551.4 

560.9 

570.4 

579.9 

589.4 

24.0 

18.6 

0.123 

1.48 

0.49 

0.791 

532.5 

542.0 

551.5 

561.0 

570.5 

580.0 

589.5 

23.8 

17.3 

0.117 

1.41 

0.46 

0.754 

532.5 

542.0 

551.5 

561.0 

570.5 

580.0 

589.5 

23.6 

16.0 

0.112 

1.34 

0.53 

0.717 

532.6 

542.1 

551.6 

561.1 

570.6 

580.1 

589.6 

23.4 

14.8 

0.107 

1.28 

0.59 

0.685 

532.6 

542.1 

551.6 

561.1 

570.6 

580.1 

589.6 

23.2 

13.5 

0.102 

1.22 

0.65 

0.653 

532.6 

542.1 

551.6 

561.1 

570.6 

580.1 

589.6 

26 

26.0 

26.0 

0.161 

1.93 

0.00 

1.000 

531.1 

540.6 

550.0 

559.5 

569.0 

578.5 

588.0 

25.8 

24.8 

0.154 

1.85 

0.08 

0.959 

531.2 

540.7 

550.1 

559.6 

569.1 

578.6 

588.1 

25.6 

23.6 

0.147 

1.78 

0.15 

0.923 

531.2 

540.7 

550.1 

559.6 

569.1 

578.6 

588.1 

25.4 

22.3 

0.141 

1.70 

0.23 

0.881 

531.2 

540.7 

550.1 

559.6 

569.1 

578.6 

588.1 

25.2 

21.2 

0.135 

1.62 

0.31 

0.839 

531.3 

540.8 

550.2 

559.7 

569.2 

578.7 

588.2 

25.0 

19.9 

0.129 

1.55 

0.38 

0.804 

531.3 

540.8 

550.2 

559.7 

569.2 

578.7 

588.2 

24.8 

18.7 

0.123 

1.48 

0.45 

0.767 

531.4 

540.9 

550.3 

559.8 

569.3 

578.8 

588.3 

24.6 

17.5 

0.118 

1.41 

0.52 

0.731 

531.4 

540.9 

550.3 

559.8 

569.3 

578.8 

588.3 

24.4 

16.2 

0.112 

1.35 

0.58 

0.700 

531.4 

540.9 

550.3 

559.8 

569.3 

578.8 

588.3 

24.2 

15.0 

0.108 

1.29 

0.64 

0.668 

531.5 

541.0 

550.4 

559.9 

569.4 

578.9 

588.4 

27 

27.0 

27.0 

0.167 

2.00 

0.00 

1.000 

529.9 

539.4 

548.9 

558.4 

567.8 

577.3 

586.7 

26.7 

25.2 

0.156 

.88 

0.12 

0.940 

529.9 

539.4 

548.9 

558.4 

567.8 

577.4 

586.8 

26.4 

23.3 

0.146 

.76 

0.24 

0.880 

530.0 

539.5 

549.0 

558.5 

567.9 

577.5 

586.9 

26.1 

21.5 

0.137 

.64 

0.36 

0.820 

530.1 

539.6 

549.1 

558.6 

568.0 

577.6 

587.0 

25.8 

19.7 

0.128 

.53 

0.47 

0.765 

530.1 

539.6 

549.1 

558.6 

568.0 

577.6 

587.0 

25.5 

17.8 

0.119 

.43 

0.57 

0.715 

530.2 

539.7 

549.2 

558.7 

568.1 

577.7 

587.1 

25.2 

16.0 

0.112 

.34 

0.66 

0.670 

530.3 

539.8 

549.3 

558.8 

568.2 

577.8 

587.2 

24.9 

14.2 

0.104 

.26 

0.74 

0.630 

530.3 

539.8 

549.3 

558.8 

568.2 

577.8 

587.2 

24.6 

12.4 

0.098 

.17 

0.83 

0.585 

530.4 

539.9 

549.4 

558.9 

568.3 

577.9 

587.3 

24.3 

10.5 

0.091 

.09 

0.91 

0.545 

530.5 

540.0 

549.5 

559.0 

568.3 

577.9 

587.3 

28 

28.0 

28.0 

0.173 

2.07 

0.00 

1.000 

528.7 

538.1 

547.6 

557.0 

566.5 

575.9 

585.4 

27.7 

26.3 

0.163 

1.95 

0.12 

0.942 

528.8 

538.2 

547.7 

557.1 

566.6 

576.0 

585.5 

27.4 

24.6 

0.153 

1.84 

0.23 

0.889 

52S.9 

538.3 

547.8 

557.2 

566.7 

576.1 

585.6 

27.1 

22.9 

0.144 

1.73 

0.34 

0.836 

528.9 

538.3 

547.8 

557.2 

566.7 

576.1 

585.6 

26.8 

21.2 

0.135 

1.62 

0.45 

0.783 

529.0 

538.4 

547.9 

557.3 

566.8 

576.2 

585.7 

26.5 

19.4 

0.126 

1.52 

0.55 

0.734 

529.1 

538.5 

548.0 

557.4 

566.9 

576.3 

585.8 

26.2 

17.7 

0.119 

1.42 

0.65 

0.686 

529.1 

538.5 

548.0 

557.4 

566.9 

576.3 

585.8 

25.9 

16.0 

0.112 

1.34 

0.73 

0.648 

529.2 

538.6 

548.1 

557.5 

567.0 

576.4 

585.9 

25.6 

14.3 

0.105 

1.26 

0.82 

0.604 

529.2 

538.6 

548.1 

557.5 

567.0 

576.4 

585.9 

25.3 

12.6 

0.098 

1.18 

0.89 

0.571 

529.2 

538.6 

548.1 

557.5 

567.0 

576.4 

585.9 

B 


108 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

-ixequ. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

Wet. 

in. 

28.0 

in. 

28.5 

in. 

29.0 

in. 

29.5 

in. 

30.0 

in. 

30.5 

in. 

31.0 

o 
29 

o 
29.0 

0 

29.0 

in. 
0.179 

gr. 
2.14 

gr. 
0.00 

1.000 

gr. 
527.6 

gr. 
537.0 

gr. 
546.5 

gr. 
555.9 

gr- 
565.3 

gr- 
574.7 

gr- 
584.1 

28.7 

27.5 

0.170 

2.03 

0.11 

0.949 

527.7 

537.1 

546.6 

556.0 

565.4 

574.8 

584.2 

28.4 

26.0 

0.161 

1.92 

0.22 

0.898 

527.7 

537.1 

546.6 

556.0 

565.4 

574.8 

584.2 

28.1 

24.5 

0.152 

1.82 

0.32 

0.851 

527.8 

537.2 

546.7 

556.1 

565.5 

574.9 

584.3 

27.8 

23.0 

0.144 

1.73 

0.41 

0.809 

527.8 

537.2 

546.7 

556.1 

565.5 

574.9 

584.3 

27.5 

21.5 

0.137 

1.64 

0.50 

0.766 

527.9 

537.3 

546.7 

556.2 

565.6 

575.0 

584.5 

27.2 

20.0 

0.129 

1.55 

0.59 

0.725 

528.0 

537.4 

546.8 

556.2 

565.7 

575.1 

584.6 

26.9 

18.5 

0.122 

1.47 

0.67 

0.687 

528.0 

537.4 

546.8 

556.3 

565.7 

575.2 

584.6 

26.6 

17.0 

0.116 

1.38 

0.76 

0.645 

528.1 

537.5 

546.9 

556.4 

565.8 

575.3 

584.7 

26.3 

15.5 

0.110 

1.30 

0.84 

0.617 

528.1 

537.5 

546.9 

556.4 

565.8" 

575.3 

584.7 

30 

30.0 

30.0 

0.186 

2.21 

0.00 

1.000 

526.5 

535.9 

515.3 

554.7 

564.1 

573.5 

582.9 

29.7 

28.6 

0.177 

2.10 

0.11 

0.951 

526.5 

535.9 

545.3 

554.7 

564.1 

573.5 

582.9 

29.4 

27.2 

0.168 

2.00 

0.21 

0.905 

526.6 

536.0 

545.4 

554.8 

564.2 

573.6 

583.0 

29.1 

25.9 

0.160 

1.91 

0.30 

0.864 

526.7 

536.1 

545.5 

554.9 

564.3 

573.7 

583.1 

28.8 

24.5 

0.152 

1.82 

0.39 

0.824 

526.7 

536.1 

545.5 

554.9 

564.3 

573.7 

583.1 

28.5 

23.1 

0.145 

.73 

0.48 

0.783 

526.8 

536.2 

545.6 

555.0 

564.4 

573.8 

583.2 

28.2 

21.7 

0.138 

.64 

0.57 

0.742 

526.8 

536.2 

545.6 

555.0 

564.4 

573.8 

583.2 

27.9 

20.3 

0.131 

.56 

0.65 

0.706 

526.9 

536.3 

545.7 

555.1 

564.5 

573.9 

583.3 

27.6 

19.0 

0.125 

.49 

0.72 

0.674 

526.9 

536.3 

545.7 

555.1 

564.5 

573.9 

583.3 

27.3 

17.6 

0.118 

.42 

0.79 

0.643 

527.0 

536.4 

545.8 

555.2 

564.6 

574.0 

583.4 

31 

31.0 

31.0 

0.192 

2.29 

0.00 

1.000 

525.4 

534.7 

544.1 

553.5 

562.9 

572.3 

581.7 

30.7 

29.9 

0.185 

2.20 

0.09 

0.961 

525.4 

534.7 

544.1 

553.5 

562.9 

572.3 

581.7 

30.4 

28.8 

0.178 

2.12 

0.17 

0.926 

525.5 

534.8 

544.2 

553.6 

563.0 

572.4 

581.8 

30.1 

27.7 

0.171 

2.04 

0.25 

0.891 

525.5 

534.8 

544.2 

553.6 

563.0 

572.4 

581.8 

29.8 

26.6 

0.164 

1.95 

0.34 

0.852 

525.6 

534.9 

544.3 

553.7 

563.1 

572.5 

581.9 

29.5 

25.5 

0.158 

1.87 

0.42 

0.817 

525.6 

534.9 

544.3 

553.7 

563.1 

572.5 

581.9 

29.2 

24.4 

0.152 

1.80 

0.49 

0.786 

525.6 

534.9 

544.3 

553.7 

563.1 

572.5 

581.9 

28.9 

23.4 

0.146 

1.73 

0.56 

0.756 

525.7 

535.0 

544.4 

553.8 

563.2 

572\6 

582.0 

28.6 

22.3 

0.141 

1.67 

0.62 

0.729 

525.7 

535.0 

544.4 

553.8 

563.2 

572.6 

582.0 

28.3 

21.2 

0.135 

1.60 

0.69 

0.699 

525.7 

535.0 

544.4 

553.8 

563.2 

572.6 

582.0 

32 

32.0 

32.0 

0.199 

2.37 

0.00 

1.000 

524.2 

533.5 

542.9 

.552.3 

561.6 

570.9 

580.3 

31.6 

30.8 

0.191 

2.27 

0.10 

0.958 

524.3 

533.6 

543.0 

552.4 

561.7 

571.0 

580.4 

31.2 

29.5 

0.182 

2.17 

0.20 

0.916 

524.4 

533.7 

543.1 

552.5 

561.8 

571.1 

580.5 

30.8 

28.3 

0.175 

2.07 

0.30 

0.874 

524.4 

533.7 

543.1 

552.5 

561.8 

571.1 

580.6 

30.4 

27.0 

0.167 

1.98 

0.39 

0.836 

524.5 

533.8 

543.2 

552.6 

561.9 

571.2 

580.6 

30.0 

25.8 

0.160 

1.90 

0.47 

0.802 

524.5 

533.8 

543.2 

552.6 

561.9 

571.2 

580.6 

29.6 

24.6 

0.153 

1.82 

0.55 

0.768 

524.6 

533.9 

543.3 

552.7 

562.0 

571.3 

580.7 

29.2 

23.3 

0.146 

1.74 

0.63 

0.735 

524.6 

533.9 

543.3 

552.7 

562.0 

571.3 

580.7 

28.8 

22.1 

0.140 

1.67 

0.70 

0.705 

524.6 

533.9 

543.3 

552.7 

562.0 

571.3 

580.7 

28.4 

20.8 

0.133 

1.60 

0.77 

0.675 

524.7 

534.0 

543.4 

552.8 

562.1 

571.4 

580.8 

B 


109 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
Foot  of 
Air. 

iVCHU. 

for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

o 
33 

Wet. 

in. 

28.O 

in. 

28.5 

in. 

29.0 

in. 

29.5 

in. 

3O.O 

in. 

30.5 

in. 

31.0 

o 
33.0 

o 
33.0 

in. 
a.207 

gr. 
2.45 

gr. 
0.00 

1.000 

gr. 
523.0 

gr. 
532.3 

gr- 
541.7 

gr- 
551.1 

gr. 
560.4 

gr. 
569.7 

gr. 
579.1 

32.5 

31.6 

0.197 

2.33 

0.12 

0.951 

523.1 

532.5 

541.8 

551.2 

560.5 

569.8 

579.2 

32.0 

30.2 

0.187 

2.22 

0.23 

0.906 

523.2 

532.6 

541.9 

551.3 

560.6 

569.9 

579.3 

31.5 

28.8 

0.178 

2.11 

0.34 

0.862 

523.3 

532.7 

542.0 

551.4 

560.7 

570.0 

579.4 

31.0 

27.4 

0.169 

2.01 

0.44 

0.821 

523.3 

532.7 

542.0 

551.4 

560.7 

570.0 

579.4 

30.5 

26.0 

0.161 

1.91 

0.54 

0.780 

523.4 

532.8 

542.1 

551.5 

560.8 

570.1 

579.5 

30.0 

24.6 

0.153 

1.82 

0.63 

0.743 

523.4 

532.8 

542.1 

551.5 

560.8 

570.1 

579.5 

29.5 

23.2 

0.145 

1.74 

0,71 

0.711 

523.5 

532.9 

542.2 

551.6 

560.9 

570.2 

579.6 

29.0 

21.8 

0.138 

1.65 

0.80 

0.674 

523.5 

532.9 

542.2 

551.6 

560.9 

570.2 

579.6 

28.5 

20.4 

0.131 

1.57 

0.88 

0.641 

523.6 

533.0 

542.3 

551.7 

561.0 

570.3 

579.7 

34 

34.0 

34.0 

0.214 

2.53 

0.00 

1.000 

521.9 

531.2 

540.6 

549.9 

559.2 

568.5 

577.8 

33.5 

32.7 

0.204 

2.42 

0.11 

0.957 

522.0 

531.4 

540.7 

550.0 

559.3 

568.6 

577.9 

33.0 

31.4 

0.195 

2.31 

0.22 

0.913 

522.0 

531.4 

540.7 

550.0 

559.3 

568.6 

577.9 

32.5 

30.1 

0.186 

2.21 

0.32 

0.874 

522.1 

531.5 

540.8 

550.1 

559.4 

568.7 

578.0 

32.0 

28.8 

0.178 

2.11 

0.42 

0.834 

522.1 

531.5 

540.8 

550.1 

559.4 

568.7 

578.0 

31.5 

27.5 

0.170 

2.01 

0.52 

0.795 

522.2 

531.6 

540.9 

550.2 

559.5 

568.8 

578.1 

31.0 

26.2 

0.162 

1.91 

0.62 

0.755 

522.3 

531.7 

541.0 

550.3 

559.6 

568.9 

578.2 

30.5 

24.9 

0.155 

1.83 

0.70 

0.724 

522.3 

531.7 

541.0 

550.3 

559.6 

568.9 

578.2 

30.0 

23.6 

0.147 

1.75 

0.78 

0.692 

522.4 

531.8 

541.1 

550.4 

559.7 

569.0 

578.3 

29.5 

22.3 

0.141 

1.67 

0.86 

0.660 

522.4 

531.8 

541.1 

550.4 

559.7 

569.0 

578.3 

29.0 

21.0 

0.134 

1.59 

0.94 

0.629 

522.5 

531.9 

541.2 

550.5 

559.8 

569.1 

578.4 

35 

35 

35.0 

0.222 

2.62 

0.00 

1.000 

520.8 

530.1 

539.4 

548.7 

558.0 

567.3 

576.6 

34 

32.5 

0.203 

2.40 

0.22 

0.916 

520.9 

530.2 

539.5 

548.8 

558.1 

567.4 

576.7 

33 

30.0 

0.186 

2.19 

0.43 

0.836 

521.0 

530.3 

539.6 

548.9 

558.3 

567.5 

576.8 

32 

27.5 

0.170 

2.00 

0.62 

0.764 

521.1 

530.4 

539.7 

549.0 

558.4 

567.6 

576.9 

31 

25.0 

0.155 

1.83 

0.79 

0.698 

521.2 

530.5 

539.8 

549.1 

558.5 

567.7 

577.0 

30 

22.5 

0.142 

1.68 

0.94 

0.641 

521.3 

530.6 

539.9 

549.2 

558.6 

567.8 

577.1 

.  29  ' 

20.0 

0.129 

1.53 

1.09 

0.584 

521.3 

530.7 

540.0 

549.3 

558.6 

567.9 

577.2 

28 

17.5 

0.117 

1.39 

1.23 

0.531 

521.4 

530.8 

540.1 

549.4 

558.7 

568.0 

577.3 

27 

15.0 

0.108 

1.27 

1.35 

0.485 

521.5 

530.9 

540.2 

549.5 

558.7 

568.1 

577.4 

36 

36 

36.0 

0.230 

2.71 

0.00 

1.000 

519.7 

529.0 

538.3 

547.5 

556.8 

566.1 

575.4 

35 

33.5 

0.210 

2.48 

0.23 

0.915 

519.8 

529.1 

538.4 

547.6 

556.9 

566.2 

575.5 

34 

31.0 

0.192 

2.27 

0.44 

0.838 

519.9 

529.2 

538.5 

547.7 

557.0 

566.3 

575.6 

33 

28.5 

0.176 

2.07 

0.64 

0.764 

520.0 

529.3 

538.6 

547.8 

557.1 

566.4 

575.7 

32 

26.0 

0.161 

1.89 

0.82 

0.698 

520.1 

529.4 

538.7 

547.9 

557.2 

566.5 

575.8 

31 

23.5 

0.147 

1.74 

0.97 

0.642 

520.2 

529.5 

538.8 

548.0 

557.3 

566.6 

575.9 

30 

21.0 

0.134 

1.58 

1.13 

0.583 

520.3 

529.6 

538.9 

548.1 

557.4 

566.7 

576.0 

29 

18.5 

0.122 

1.45 

1.26 

0.535 

520.4 

529.7 

539.0 

548.2 

557.5 

566.8 

576.1 

28 

16.0 

0.112 

1.32 

1.39 

0.487 

520.5 

529.8 

539.1 

548.3 

557.6 

566.9 

576.2 

B 


110 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

1.000. 

in. 

28.O 

in. 

28.5 

in. 

29.0 

in. 

29.5 

in. 

30.0 

in. 

30.5 

in. 

31.0 

Dry. 

Wet. 

o 

o 

o 

in. 

gr. 

gr. 

gr. 

gr- 

gr. 

gr- 

gr. 

gr- 

gr. 

37 

37 

37.0 

0.238 

2.80 

0.00 

1.000 

518.6 

527.8 

537.1 

546.3 

555.6 

564.8 

574.1 

36 

34.5 

0.218 

2.56 

0.24 

0.914 

518.7 

527.9 

537.2 

546.4 

555.7 

564.9 

574.2 

35 

32.0 

0.199 

2.35 

0.45 

0.839 

518.8 

528.0 

537.3 

546.5 

555.8 

565.0 

574.3 

34 

29.5 

0.182 

2.14 

0.66 

0.764 

518.9 

528.1 

537.4, 

546.6 

555.9 

565.1 

574.4 

33 

27.0 

0.167 

1.96 

0.84 

0.700 

519.0 

528.2 

537.5 

546.7 

556.0 

565.2 

574.5 

32 

24.5 

0.152 

1.79 

1.01 

0.640 

519.1 

528.3 

537.6 

546.8 

556.1 

565.3 

574.6 

31 

22.0 

0.139 

1.64 

1.16 

0.586 

519.2 

528.4 

537.7 

546.9 

556.2 

565.4 

574.7 

30 

19.5 

0.127 

1.50 

1.30 

0.536 

519.3 

528.5 

537.8 

547.1 

556.3 

565.5 

574.8 

29 

17.0 

0.116 

1.S7 

1.43 

0.489 

519.4 

528.6 

537.9 

547.2 

556.4 

565.6 

574.9 

38 

38 

38.0 

0.246 

2.89 

0.00 

1.000 

517.4 

526.6 

535.9 

545.1 

554.4 

563.6 

572.9 

37 

35.5 

0.226 

2.65 

0.24 

0.917 

517.5 

526.7 

536.0 

545.2 

554.5 

563.7 

573.0 

36 

33.0 

0.207 

2.43 

0.46 

0.841 

517.6 

526.8 

536.1 

545.3 

554.6 

563.8 

573.1 

35 

30.5 

0.189 

2.22 

0.67 

0.768 

517.7 

526.9 

536.2 

545.4 

554.7 

563.9 

573.2 

34 

28.0 

0.173 

2.03 

0.86 

0.703 

517.8 

527.0 

536.3 

545.5 

554.8 

564.0 

573.3 

33 

25.5 

0.158 

1.85 

1.04 

0.640 

517.9 

527.1 

536.4 

545.6 

554.9 

564.1 

573.4 

32 

23.0 

0.144 

1.70 

1.19 

0.588 

518.0 

527.2 

536.5 

545.7 

555.0 

564.2 

573.5 

31 

20.5 

0.132 

1.54 

1.35 

0.533 

518.1 

527.3 

536.6 

545.8 

555.1 

564.3 

573.6 

30 

18.0 

0.120 

1.39 

1.50 

0.481 

518.2 

527.4 

536.7 

545.9 

555.2 

564.4 

573.7 

39 

39 

39.0 

0.255 

2.99 

0.00 

1.000 

516.3 

525.5 

534.7 

543.9 

553.2 

562.4 

571.6 

38 

36.5 

0.234 

2.74 

0.25 

0-917 

516.4 

525.6 

534.8 

544.0 

553.3 

562.5 

571.7 

37 

34.0 

0.214 

2.51 

0.48 

0.840 

516.5 

525.7 

534.9 

544.1 

553.4 

562.6 

571.8 

36 

31.5 

0.196 

2.30 

0.69 

0.769 

516.6 

525.8 

535.0 

544.2 

553.5 

562.7 

571.9 

35 

29.0 

0.179 

2.10 

0.89 

0.703 

516.7 

525.9 

535.1 

544.3 

553.6 

562.8 

572.1 

34 

26.5 

0.164 

.91 

1.08 

0.639 

516.8 

526.0 

535.2 

544.4 

553.7 

562.9 

572.2 

33 

24.0 

0.150 

.76 

1.23 

0.589 

516.9 

526.1 

535.3 

544.5 

553.8 

563.0 

572.3 

32 

21.5 

0.137 

.60 

1.39 

0.535 

517.0 

526.2 

535.4 

544.6 

553.9 

563.1 

572.4 

31 

19.0 

0.125 

.46 

1.53 

0.488 

517.1 

526.3 

535.6 

544.8 

554.1 

563.3 

572.6 

30 

16.5 

0.114 

.32 

1.67 

0.442 

517.2 

526.4 

535.7 

544.9 

554.2 

563.4 

572.7 

40 

40 

40.0 

0.264 

3.09 

0.00 

1.000 

515.2 

524.4 

533.6 

542.8 

552.0 

561.2 

570.4 

39 

37.8 

0.245 

2.86 

0.23 

0.926 

515.3 

524.5 

533.7 

542.9 

552.1 

561.3 

570.5 

38 

35.6 

0.227 

2.65 

0.44 

0.858 

515.4 

524.6 

533.8 

543.0 

552.2 

561.4 

570.6 

37 

33.4 

0.210 

2.45 

0.64 

0.793 

515.5 

524.7 

533.9 

543.1 

552.3 

561.5 

570.7 

36 

31.2 

0.194 

2.27 

0.82 

0.734 

515.6 

524.8 

534.0 

543.2 

552.4 

561.6 

570.8 

35 

29.0 

0.179 

2.09 

.00 

0.676 

515.7 

524.9 

534.1 

543.3 

552.5 

561.7 

570.9 

34 

26.8 

0.165 

.94 

.15 

0.628 

515.8 

525.0 

534.2 

543.4 

552.6 

561.8 

571.0 

33 

24.6 

0.153 

.79 

.30 

0.579 

515.9 

525.1 

534.3 

543.5 

552.7 

561.9 

571.1 

32 

22.4 

0.141 

.65 

.44 

0.534 

516.0 

525.2 

534.4 

543.6 

552.8 

562.0 

571.2 

31 

20.2 

0.130 

.53 

.56 

0.495 

516.1 

525.3 

534.5 

543.7 

552.9 

562.1 

571.3 

30 

18.0 

0.120 

.42 

.67 

0.459 

516.1 

525.3 

534.5 

543.8 

553.0 

562.2 

571.4 

B 


111 


8 


PSYCHROMETRICAL    TABLES. 


Res 
of 
moi 

F{ 

Dry. 

ding 
Fher- 
icter, 
ihr. 

Wet. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

1.000. 

in. 

28.0 

in. 

28.5 

in. 

29.0 

in. 

29.5 

in. 

3O.O 

in. 

30.5 

in. 

31.0 

0 

o 

o 

in. 

gr- 

gr. 

gr. 

gr. 

gr. 

gr- 

gr. 

gr. 

gr- 

41 

41 

41.0 

0.274 

3.19 

0.00 

1.000 

514.1 

523.3 

532.5 

541.6 

550.8 

560.0 

569.2 

40 

38.8 

0.253 

2.96 

0.23 

0.928 

514.2 

523.4 

532.6 

541.7 

550.9 

560.1 

569.3 

39 

36.6 

0.235 

2.74 

0.45 

0.859 

514.3 

523.5 

532.7 

541.8 

551.0 

560.2 

569.4   ! 

38 

34.4 

0.217 

2.54 

0.65 

0.796 

514.4 

523.6 

532.8 

541.9 

551.1 

560.3 

569.5   ' 

37 

32.2 

0.201 

2.35 

0.84 

0.737 

514.5 

523.7 

532.9 

542.0 

551.2 

560.4 

569.6  i' 

36 

30.0 

0.186 

2.16 

1.03 

0.677 

514.6 

523.8 

533.0 

542.1 

551.3 

560.5 

569.7  j  : 

35 

27.8 

0.172 

2.01 

1.18 

0.630 

514.7 

523.9 

533.1 

542.2 

551.4 

560.6 

569.8 

34 

25.6 

0.158 

1.85 

1.34 

0.580 

514.8 

524.0 

533.2 

542.3 

551.5 

560.7 

569.9 

33 

23.4 

0.146 

1.71 

1.48 

0.536 

514.9 

524.1 

533.3 

542.4 

551.6 

560.8 

570.0 

32 

21.2 

0.135 

1.58 

1.61 

0.495 

514.9 

524.1 

533.3 

542.5 

551.7 

560.9 

570.1 

31 

19.0 

0.125 

1.46 

1.73 

0.458 

515.0 

524.2 

533.4 

542.6 

551.8 

561.0 

570.2 

42 

42 

42.0 

0.283 

3.30 

0.00 

1.000 

513.0 

522.2 

531.3 

540.5 

549.6 

558.8 

5679 

41 

39.8 

0.263 

3.06 

0.24 

0.927 

513.1 

522.3 

531.4 

540.6 

549.7 

558.9 

568.0 

40 

37.6 

0.243 

2.83 

0.47 

0.858 

513.2 

522.4 

531.5 

540.7 

549.9 

559.0 

568.1 

39 

35.4 

0.225 

2.63 

0.67 

0.797 

513.3 

522.5 

531.6 

540.8 

550.0 

559.1 

568.2 

38 

33.2 

0.208 

2.43 

0.87 

0.736 

513.4 

522.6 

531.7 

540.9 

550.1 

559.2 

568.3 

37 

31.0 

0.192 

2.24 

1.06 

0.679 

513.5 

522.7 

531.8 

541.0 

550.2 

559.3 

568.4 

36 

28.8 

0.178 

2.08 

.22 

0.631 

513.6 

522.8 

531.9 

541.1 

550.3 

559.4 

568.5 

35 

26.6 

0.164 

1.91 

.39 

0.579 

513.7 

522.9 

532.0 

541.2 

550.4 

559.5 

568.6 

34 

24.4 

0.152 

1.77 

.53 

0.536 

513.8 

523.0 

532.1 

541.3 

550.5 

559.6 

568.7 

33 

22.2 

0.140 

1.63 

.67 

0.494 

513.9 

523.1 

532.2 

541.4 

550.6 

559.7 

568.8 

32 

20.0 

0.129 

1.51 

.79 

0.458 

513.9 

523.1 

532.3 

541.5 

550.6 

559.8 

569.0 

43 

43 

43.0 

0.293 

3.41 

0.00 

1.000 

511.8 

520.9 

530.1 

539.3 

548.4 

557.5 

566.7 

42 

40.8 

0.272 

3.16 

0.25 

0.927 

511:9 

521.0 

530.2 

539.4 

548.6 

557.7 

566.9 

41 

38.6 

0.252 

2.93 

0.48 

0.859 

512.0 

521.1 

530.3 

539.5 

548.7 

557.8 

567.0 

40 

36.4 

0.233 

2.71 

0.70 

0.795 

512.1 

521.2 

530.4 

539.6 

548.8 

557.9 

567.1 

39 

34.2 

0.216 

2.51 

0.90 

0.736 

512.2 

521.3 

530.5 

539.7 

548.9 

558.0 

567.2 

38 

32.0 

0.199 

2.32 

1.09 

0.680 

512.3 

521.4 

530.7 

539,8 

549.0 

558.1 

567.3 

37 

29.8 

0.184 

2.15 

1.26 

0.630 

512.4 

521.5 

530.8 

539.9 

549.1 

558.2 

567.4 

36 

27.6 

0.170 

1.98 

1.43 

0.581 

512.5 

521.6 

530.9 

540.0 

549.2 

558.3 

567.5 

35 

25.4 

0.157 

1.82 

1.59 

0.534 

512.6 

521.7 

531.0 

540.1 

549.3 

558.4 

567.6 

34 

23.2 

0.145 

1.69 

1.72 

0.495 

512.7 

521.8 

531.1 

540.2 

549.4 

558.5 

567.7 

33 

21.0 

0.134 

1.56 

1.85 

0.458 

512.9 

522.0 

531.2 

540.3 

549.5 

558.6 

567.8 

44 

44 

44.0 

0.304 

3.52 

0.00 

1.000 

510.8 

519.9 

529.0 

538.1 

547.3 

556.4 

565.5 

43 

41.8 

0.282 

3.27 

0.25 

0.929 

510.9 

520.0 

529.1 

538.2 

547.5 

556.5 

565.7 

42 

39.6 

0.261 

3.02 

0.50 

0.858 

511.0 

520.1 

529.2 

538.3 

547.6 

556.6 

565.8 

41 

37.4 

0.241 

2.80 

0.72 

0.796 

511.1 

520.2 

529.3 

538.4 

547.7 

556.7 

565.9 

40 

35.2 

0.223 

2.60 

0.92 

0.739 

511.2 

520.3 

529.4 

538.5 

547.8 

556.8 

566.0 

39 

33.0 

0.207 

2.40 

1.12 

0.682 

511.3 

520.4 

529.5 

538.6 

547.9 

556.9 

566.1 

38 

30.8 

0.191 

2.22 

1.30 

0.631 

511.4 

520.5 

529.6 

538.7 

548.0 

557.0 

566.2 

37 

28.6 

0.177 

2.05 

1.47 

0.582 

511.5 

520.6 

529.7 

538.8 

548.1 

557.1 

566.3 

36 

26.4 

0.163 

1.89 

1.63 

0.537 

511.6 

520.7 

529.8 

538.9 

548.2 

557.2 

566.4   i 

35 

24.2 

0.151 

1.75 

1.77 

0.497 

511.7 

520.8 

529.9 

539.0 

548.3 

557.3 

566.5 

34 

22.0 

0.139 

1.62 

1.90 

0.460 

511.7 

520.8 

530.0 

539.1 

548.3 

557.4 

566.6 

B 


112 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point. 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion  — 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

ixequ. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

Wet. 

1.000. 

in. 

28.0 

in. 

28.5 

in. 

29.0 

in. 

29.5 

in. 

3O.O 

in. 

3O.5 

in. 

31.O 

o 
45 

o 
45 

o 
45.0 

in. 
0.315 

gr. 
3.64 

gr- 
0.00 

1.000 

gr. 
509.7 

gr. 
518.8 

gr. 
527.9 

gr. 
537.0 

gr. 
546.1 

gr. 
555.2 

gr- 
564.3 

44 

42.9 

0.292 

3.39 

0.25 

0.931 

509.8 

518.9 

528.0 

537.1 

546.3 

555-3 

564.5 

43 

40.8 

0.272 

3.14 

0.50 

0.863 

509.9 

519.0 

528.1 

537.2 

546.4 

555.4 

564.6 

42 

38.7 

0.253 

2.92 

0.72 

0.802 

510.0 

519.1 

528.2 

537.3 

546.5 

555.5 

564.7 

41 

36.6 

0.235 

2.70 

0.94 

0.742 

510.1 

519.2 

528.3 

537.4 

546.6 

555.6 

564.8 

40 

34.5 

0.218 

2.52 

1.12 

0.692 

510.2 

519.3 

528.4 

537.5 

546.7 

555.7 

564.9 

39 

32.4 

0.202 

2.34 

1.30 

0.643 

510.3 

519.4 

528.5 

537.6 

546.8 

555.8 

565.0 

38 

30.3 

0.188 

2.16 

1.48 

0.593 

510.4 

519.5 

528.6 

537.7 

546.9 

555.9 

565.1 

37 

28.2 

0.174 

2.01 

1.63 

0.552 

510.5 

519.6 

528.7 

537.8 

547.0 

556.0 

565.2 

36 

26.1 

0.161 

1.87 

1.77 

0.514 

510.6 

519.7 

528.8 

537.9 

547.1 

556.1 

565.3 

35 

24.0 

0.150 

1.73 

1.91 

0.475 

510.7 

519.8 

528.9 

538.0 

547.2 

556.3 

565.4 

46 

46 

46.0 

0.326 

3.76 

0.00 

1.000 

508.6 

517.7 

526.7 

535.8 

544.9 

554.0 

563.1 

45 

43.9 

0.303 

3.50 

0.26 

0.931 

508.7 

517.8 

526.8 

535.9 

545.0 

554.1 

563.2 

44 

41.8 

0.282 

3.25 

0.51 

0.864 

508.8 

517.9 

526.9 

536.0 

545.1 

554.2 

563.3 

43 

39.7 

0.262 

3.02 

0.74 

0.803 

508.9 

518.0 

527.0 

536.1 

545.2 

554.3 

563.4 

42 

37.6 

0.243 

2.30 

0.96 

0.745 

509.0 

518.1 

527.2 

536.3 

545.4 

554.5 

563.6 

41 

35.5 

0.226 

2.61 

1.15 

0.694 

509.1 

518.2 

527.3 

536.4 

545.5 

554.6 

563.7 

40 

33.4 

0.210 

2.42 

1.34 

0.643 

509.2 

518.3 

527.4 

536.5 

545.6 

554.7 

563.8 

39 

31.3 

0.194 

2.24 

1.52 

0.596 

509.3 

518.4 

527.5 

536.6 

545.7 

554.8 

563.9 

38 

29.2 

0.180 

2.08 

1.68 

0.553 

509.4 

518.5 

527.6 

536.7 

545.8 

554.9 

564.0 

37 

27.1 

0.167 

1.93 

1.83 

0.514 

509.5 

518.6 

527.7 

536.8 

545.9 

555.0 

564.1 

36 

25.0 

0.155 

1.79 

1.97 

0.476 

509.5 

518.6 

527.7 

536.8 

545.9 

555.0 

564.1 

47 

47 

47.0 

0.337 

3.88 

0.00 

1.000 

507.5 

516.5 

525.6 

534.7 

543.8 

552.8 

561.9 

46 

44.9 

0.313 

3.62 

0.26 

0.933 

507.6 

516.6 

525.7 

534.8 

543.9 

552.9 

562.0 

45 

42.8 

0.291 

3.36 

0.52 

0.866 

507.8 

516.7 

525.9 

535.0 

544.1 

553.1 

562.2 

44 

40.7 

0.271 

3.12 

0.76 

0.804 

507.9 

516.8 

526.0 

535.1 

544.2 

553.2 

562.3 

43 

38.6 

0.252 

2.90 

0.98 

0.747 

508.0 

516.9 

526.1 

535.2 

544.3 

553.3 

562.4 

42 

36.5 

0.234 

2.70 

1.18 

0.696 

508.1 

517.0 

526.2 

535.3 

544.4 

553.4 

562.5 

41 

34.4 

0.217 

2.51 

1.37 

0.647 

508.2 

517.1 

526.3 

535.4 

544.5 

553.5 

562.6 

40 

32.3 

0.201 

2.32 

1.56 

0.598 

508.3 

517.2 

526.4 

535.5 

544.6 

553.6 

562.7 

39 

30.2 

0.187 

2.16 

1.72 

0.557 

508.4 

517.3 

526.5 

535.6 

544.7 

553.7 

562.8 

38    ! 

28.1 

0.173 

2.00 

1.88 

0.515 

508.5 

517.4 

526.6 

535.7 

544.8 

553.8 

562.9 

37 

26.0 

0.161 

1.85 

2.03 

0.477 

508.5 

517.6 

526.7 

535.8 

544.9 

554.0 

563.1 

48 

48 

48.0 

0.349 

4.01 

0.00* 

1.000 

506.4 

515.4 

524.5 

533.5 

542.6 

551.6 

560.7 

47 

45.9 

0.324 

3.73 

0.28 

0.930 

506.5 

515.5 

524.6 

533.7 

542.8 

551.8 

560.9 

46 

43.8 

0.302 

3.47 

0.54 

0.865 

506.6 

515.6 

524.7 

533.8 

542.9 

551.9 

561.0 

45 

41.7 

0.281 

3.23 

0.78 

0.805 

506.7 

515.7 

524.8 

533.9 

543.0 

552.0 

.561.1 

44 

39.6 

0.261 

3.00 

1.01 

0.748 

506.8 

515.8 

524.9 

534.0 

543.1 

552.1 

561.2 

43 

37.5 

0.242 

2.79 

1.22 

0.696 

506.9 

515.9 

525.0 

534.1 

543.2 

552.2 

561.3 

42 

35.4 

0.225 

2.60 

1.41 

0.648 

507.0 

516.0 

525.1 

534.2 

543.3 

552.3 

561.4 

41 

33.3 

0.209 

2.40 

1.61 

0.598 

507.1 

516.1 

525.2 

534.4 

543.5 

552.5 

561.5 

40 

31.2 

0.194 

2.24 

1.77 

0.558 

507.2 

516.2 

525.3 

534.5 

543.5 

552.5 

561.6 

39 

29.1 

0.180 

2.07 

1.94 

0.516 

507.3 

516.3 

525.4 

534.6 

543.6 

552.6 

561.6 

38 

27.0 

0.167 

1.92 

2.09 

0.479 

507.4 

516.4 

525.5 

534.7 

543.6 

552.7 

561.7 

37 

24.9 

0.155 

1.77 

2.24 

0.441 

507.4 

516.4 

525.6 

534.7 

543.7 

552.8 

561.8 

B 


113 


10 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

1.000. 

d€M» 

in. 
28.5 

in. 

29.0 

in. 

29.5 

in. 

30.0 

in. 
3O.5 

in. 

31.O 

Dry. 

Wet. 

0 

0 

o 

in. 

gr- 

gr. 

gr. 

gr. 

gr. 

gr. 

gr- 

gr. 

gr. 

49 

49 

49.0 

0.361 

4.14 

0.00 

1.000 

505.3 

514.3 

523.3 

532.3 

541.4 

550.4 

559.4 

48 

46.9 

0.336 

3.85 

0.29 

0.930 

505.4 

514.4 

523.4 

532.4 

541.5 

550.5 

559.5 

47 

44.8 

0.312 

3.59 

0.55 

0.867 

505.6 

514.6 

523.6 

532.6 

541.7 

550.7 

559.7 

46 

42.7 

0.290 

3.34 

0.80 

0.807 

505.7 

514.7 

523.7 

532.7 

541.8 

550.8 

559.8 

45 

40.6 

0.270 

3.10 

.04 

0.749 

505.9 

514.9 

523.8 

532.9 

542.0 

551.0 

560.0 

44 

38.5 

0.251 

2.88 

.26 

0.696 

506.0 

515.0 

523.9 

533.0 

542.1 

551.1 

560.1 

43 

36.4 

0.233 

2.68 

.46 

0.647 

506.1 

515.1 

524.0 

533.1 

542.2 

551.2 

560.2 

42 

34.3 

0.216 

2.49 

.65 

0.601 

506.2 

515.2 

524.1' 

533.2 

542.3 

551.3 

560.3 

41 

32.2 

0.201 

2.32 

.82 

0.560 

506.3 

515.3 

524.2 

533.3 

542.4 

551.4 

560.4 

40 

30.1 

0.186 

2.14 

2.00 

0.517 

506.3 

515.3 

524.3 

533.4 

542.5 

551.5 

560.5 

39 

28.0 

0.173 

1.99 

2.15 

0.481 

506.4 

515.4 

524.4 

533.5 

542.6 

551.6 

560.6 

38 

25.9 

0.160 

1.84 

2.30 

0.444 

506.4 

515.4 

524.4 

533.5 

542.6 

551.6 

560.6 

50 

50 

50.0 

0.373 

4.28 

0.00 

1.000 

504.1 

513.1 

522.1 

531.1 

540.2 

549.2 

558.2 

49 

48.0 

0.349 

3.99 

0.29 

0.932 

504.2 

513.2 

522.2 

531.2 

540.3 

549.3 

558.3 

48 

46.0 

0.326 

3.73 

0.55 

0.871 

504.4 

513.4 

522.4 

531.4 

540.5 

549.5 

558.5 

47 

44.0 

0.304 

3.48 

0.80 

0.813 

504.5 

513.5 

522.5 

531.5 

540.6 

549.6 

558.6 

46 

42.0 

0.283 

3.25 

1.03 

0.759 

504.6 

513.6 

522.6 

531.6 

540.7 

549.7 

558.7 

45 

40.0 

0.264 

3.03 

1.25 

0.708 

504.8 

513.8 

522.8 

531.8 

540.9 

549.9 

558.9. 

44 

38.0 

0.246 

2.82 

1-.46 

0.659 

504.9 

513.9 

522.9 

532.0 

541.0 

550.0 

559.0 

43 

36.0 

0.230 

2.63 

1.65 

0.614 

505.1 

514.1 

523.1 

532.1 

541.2 

550.2 

559.2 

42 

34.0 

0.214 

2.45 

1.83 

0.572 

505.2 

514.2 

523.2 

532.2 

541.3 

550.3 

559.3 

41 

32.0 

0.199 

2.28 

2.00 

0.533 

505.3 

514.3 

523.3 

532.3 

541.4 

550.4 

559.4 

40 

30.0 

0.186 

2.12 

2.16 

0.495 

505.4 

514.4 

523.4 

532.4 

541.5 

550.5 

559.5 

39 

28.0 

0.173 

1.97 

2.31 

0.460 

505.5 

514.5 

523.5 

532.5 

541.6 

550.6 

559.6 

51 

51 

51.0 

0.386 

4.42 

0.00 

1.000 

503.1 

512.1 

521.1 

530.0 

'539.0 

548.0 

557.0 

50 

49.0 

0.361 

4.12 

0.30 

0.932 

503.2 

512.2 

521.2 

530.1 

539.1 

548.1 

557.1 

49 

47.0 

0.337 

3.85 

0.57 

0.871 

503.3 

512.3 

521.3 

530.3 

539.3 

548.3 

557.3 

48 

45.0 

0.315 

3.60 

0.82 

0.814 

503.4 

512.4 

521.4 

530.4 

539.4 

548.4 

557.4 

47 

43.0 

0.293 

3.36 

1.06 

0.760 

503.5 

512.5 

521.5 

530.5 

539.5 

548.5 

557.5 

46 

41.0 

0.274 

3.13 

1.29 

0.708 

503.7 

512.7 

521.7 

530.7 

539.7 

548.7 

557.7 

45 

39.0 

0.255 

2.92 

1.50 

0.661 

503.8 

512.8 

521.8 

530.8 

539.8 

548.8 

557.8 

44 

37.0 

0.238 

2.72 

1.70 

0.615 

503.9 

512.9 

521.9 

530.9 

539.9 

548.9 

557.9 

43 

35.0 

0.222 

2.54 

1.88 

0.575 

504.0 

513.0 

522.0 

531.0 

540.0 

549.0 

558.0 

42 

33.0 

0.207 

2.36 

2.06 

0.534 

504.1 

513.1 

522.1 

531.1 

540.1 

549-1 

558.1 

41 

31.0 

0.192 

2.20 

2.22 

0.498 

504.2 

513.2 

522.2 

531.2 

540.3 

549.3 

558.3 

40 

29.0 

0.179 

2.05 

2.37 

0.464 

504.3 

513.3 

522.3 

531.3 

540.4 

549.4 

558.4 

52 

52 

52.0 

0.400 

4-56 

0.00 

1.000 

502.1 

511.9 

520.0 

528.9 

537.9 

546.8 

555.8 

51 

50.0 

0.373 

4.26 

0.30 

0.934 

502.2 

511.1 

520.1 

529.0 

538.0 

546.9 

555.9 

50 

48.0 

0.349 

3.98 

0.58 

0.873 

502.4 

511.3 

520.3 

529.2 

538.2 

547-1 

556.1 

49 

46.0 

0.326 

3.72 

0.84 

0.816 

502.5 

511.4 

520.4 

529.3 

538.3 

547.2 

556.2 

48 

44.0 

0.304 

3.47 

.09 

0.761 

502.6 

511.5 

520.5 

529.4 

538.4 

547.3 

556.3 

47 

42.0 

0.283 

3.23 

.33 

0.709 

502.8 

511.7 

520.7 

529.6 

538.6 

547.5 

556.5 

46 

40.0 

0.264 

3.02 

.54 

0.662 

502.9 

511.8 

520.8 

529.7 

538.7 

547-6 

556.6 

45 

38.0 

0.246 

2.81 

.75 

0.616 

502.9 

511.9 

520.9 

529.8 

538.8 

547.8 

556.8 

44 

36.0 

0.230 

2.63 

.93 

0.577 

503.1 

512.0 

521.0 

529.9 

539.0 

548.0 

557.0 

43 

34.0 

0.214 

2.44 

2.12 

0.535 

503'.2 

512.1 

521.1 

530.0 

539.1 

548.1 

557.1 

42 

32.0 

0.199 

2.28 

2.28 

0.500 

503.3 

512.3 

521.3 

530.2 

539.2 

548.2 

557.2 

41 

30.0 

0.186 

2.13 

2.43 

0.467 

503.4 

512.4 

521.4 

530.3 

539.3 

548.3 

557.3 

B 


114 


PSYCHROMETRICAL    TABLES. 


11 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

.n.equ. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

1.000. 

in. 

28.O 

in. 
28.5 

in. 
29.0 

in. 

29.5 

in. 

30.0 

in. 

30.5 

in. 

31.0 

Dry. 

Wet. 

o 

o 

o 

in. 

gr. 

gr. 

gr. 

gr. 

gr. 

gr. 

gr- 

gr. 

gr. 

53 

53 

53.0 

0.414 

4.71 

0.00 

1.000 

500.9 

509.8 

518.8 

527.7 

536.7 

545.6 

554.6 

52 

51.0 

0.386 

4.40 

0.31 

0.934 

501.1 

510.0 

519.0 

527.9 

536.9 

545-8 

554.8 

51 

49.0 

0.361 

4.11 

0.60 

0.873 

501.2 

510.1 

519.1 

528.0 

537.0 

545.9 

554.9 

50 

47.0 

0.337 

3.84 

0.87 

0.815 

501.4 

510.3 

519.3 

528.2 

537.2 

546.1 

555.1 

49 

45.0 

0.315 

3.58 

1.13 

0.760 

501.5 

510.4 

519.4 

528.3 

537.3 

546.2 

555.2 

48 

43.0 

0.293 

3.34 

1.37 

0.709 

501.6 

510.5 

519.5 

528.4 

537.4 

546.3 

555.3 

47 

41.0 

0.274 

3.12 

1.59 

0.662 

501.7 

510.6 

519.6 

528.5 

537.5 

546.4 

555.4 

46 

39.0 

0.255 

2.91 

1.80 

0.618 

501.8 

510.7 

519.7 

528.6 

537.6 

546.5 

555.5 

45 

37.0 

0.238 

2.71 

2.00 

0.575 

502.0 

510.9 

519.9 

528.8 

537.8 

546.7 

555.7 

44 

35.0 

0.222 

2.53 

2.18 

0.537 

502.1 

511.0 

520.0 

528.9 

537.9 

546.8 

555.8 

43 

33.0 

0.207 

2.35 

2.36 

0.499 

502.1 

511.0 

520.0 

528.9 

538.0 

546.9 

555.9 

42 

31.0 

0.192 

2.18 

2.53 

0.463 

502.2 

511.1 

520.1 

529.0 

538.1 

547.0 

556.0 

54 

54 

54.0 

0.428 

4.86 

0.00 

1.000 

499.9 

508.8 

517.8 

526.7 

535.6 

544.5 

553.5 

53 

52.0 

0.400 

4.54 

0.32 

0.934 

500.0 

508.9 

517.9 

526.8 

535.7 

544.6 

553-6 

52 

50.0 

0.373 

4.25 

0.61 

0.875 

500.2 

509.1 

518.1 

527.0 

535.9 

544.8 

553.8 

51 

48.0 

0.349 

3.96 

0.90 

0.815 

500.3 

509.2 

518.2 

527.1 

536.0 

544.9 

553.9 

50 

46.0 

0.326 

3.70 

1.16 

0.761 

500.4 

509.3 

518.3 

527.2 

536.1 

545.0 

554.0 

49 

44.0 

0.304 

3.45 

1.41 

0.709 

500.6 

509.5 

518.5 

527.4 

536.3 

545.2 

554.2 

48 

42.0 

0.283 

3.23 

1.63 

0.665 

500.7 

509.6 

518.6 

527.5 

536.4 

545.3 

554.3 

47 

40.0 

0.264 

3.01 

1.85 

0.619 

500.8 

509.7 

518.7 

527.6 

536.5 

545.4 

554.4 

46 

38.0 

0.246 

2.80 

2.06 

0.576 

500.9 

509.8 

518.8 

527.7 

536.7 

545.6 

554.6 

45 

36.0 

0.230 

2.61 

2.25 

0.537 

501.0 

509.9 

518.9 

527.8 

536.8 

545.7 

554.7 

44 

34.0 

0.214 

2.43 

2.43 

0.500 

501.1 

510.0 

519.0 

527.9 

536.9 

545.8 

554.8 

43 

32.0 

0.199 

2.27 

2.59 

0.467 

501.2 

510.1 

519.1 

528.0 

537.0 

545.9 

554.9 

42 

30.0 

0.186 

2.10 

2.76 

0.432 

501.3 

510.2 

519.2 

528.1 

537.1 

546.0 

555.0 

41 

28.0 

0.173 

1.96 

2.90 

0.403 

501.4 

510.3 

519.3 

528.2 

537.2 

546.1 

555.1 

40 

26.0 

0.161 

1.82 

3.04 

0.375 

501.5 

510.4 

519.4 

528.3 

537.3 

546.2 

555.2 

55 

55 

55.0 

0.442 

5.02 

0.00 

1.000 

498.8 

507.7 

516.6 

525.5 

534.4 

543.3 

552.2 

54 

53.3 

0.418 

4.74 

0.28 

0.944 

499.0 

507.9 

516.8 

525.7 

534.6 

543.5 

552.4 

53 

51.6 

0.394 

4.46 

0.56 

0.888 

499.1 

508.0 

516.9 

525.8 

534.7 

543.6 

552.5 

52 

49.9 

0.372 

4.23 

0.79 

0.843 

499.3 

508.2 

517.1 

526.0 

534.9 

543.8 

552.7 

51 

48.2 

0.351 

3.98 

1.04 

0.793 

499.4 

508.3 

517.2 

526.1 

535.0 

543.9 

552.8 

50 

46.5 

0.331 

3.76 

1.26 

0.749 

499.5 

508.4 

517.3 

526.2 

535.1 

544.0 

552.9 

49 

44.8 

0.312 

3.55 

1.47 

0.707 

499.7 

508.6 

517.5 

526.3 

535.3 

544.2 

553.1 

48 

43.1 

0.295 

3.34 

1.68 

0.665 

499.8 

508.7 

517.6 

526.5 

535.4 

544.3 

553.3 

47 

41.4 

0.278 

3.14 

1.88 

0.626 

499.8 

508.7 

517.6 

526.6 

535.5 

544.4 

553.4 

46 

39.7 

0.262 

2.97 

2.05 

0.591 

499.9" 

508.8 

517.7 

526.7 

535.6 

544.5 

553.5 

45 

38.0 

0.246 

2.79 

2.23 

0.556 

500.0 

508.9 

517.9 

526.8 

535.7 

544.6 

553.6 

44 

36.3 

0.232 

2.64 

2.38 

0.526 

500.1 

509.0 

518.0 

526.9 

535.8 

544.7 

553.7 

43 

34.6 

0.219 

2.47 

2.55 

0.492 

500.2 

509.1 

518.1 

527.0 

535.9 

544.8 

553.8 

42 

32.9 

0.206 

2.32 

2.70 

0.462 

500.3 

509.2 

518.2 

527.1 

536.0 

544.9 

553.9 

41 

31.2 

0.194 

2.20 

2.82 

0.438 

500.4 

509.3 

518.3 

527.1 

536.0 

544.9 

554.0 

40 

29.5 

0.182 

2.07 

2.95 

0.412 

500.5 

509.3 

518.4 

527.2 

536.1 

545.0 

554.1 

39 

27.8 

0.172 

1.95 

3.07 

0.388 

500.6 

509.4 

518.5 

527.3 

536.2 

545.1 

554.2 

38 

26.1 

0.161 

J.83 

3.19 

0.365 

500.7 

509.5 

518.6 

527.4 

536.2 

545.1 

554.2 

B 


115 


12 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

1.000. 

in. 

28.0 

in. 
28.5 

.in. 

29.O 

in. 

29.5 

in. 

30.0 

in. 

30.5 

in. 

31.0 

Dry. 

Wet. 

o 

o 

o 

in. 

gr- 

gr. 

gr. 

gr. 

gr- 

gr- 

gr. 

gr- 

... 

56 

56 

56.0 

0.458 

5.18 

0.00 

1.000 

497.7 

506.6 

515.5 

524.4 

533.2 

542.1 

551.0 

55 

54.3 

0.432 

4.89 

0.29 

0.944 

497.9 

506.8 

515.7 

524.6 

533.4 

542.3 

551.2 

54 

52.6 

0.408 

4.61 

0.57 

0.890 

498.0 

506.9 

515.8 

524.7 

533.5 

542.4 

551.3 

53 

50.9 

0.385 

4.37 

0.81 

0.844 

498.2 

507.1 

516.0 

524.9 

533.7 

542.6 

551.5 

52 

49.2 

0.363 

4.11 

1.07 

0.793 

498.3 

507.2 

516.1 

525.0 

533.8 

542.7 

551.6 

51 

47.5 

0.343 

3.87 

1.31 

0.747 

498.4 

507.3 

516.2 

525.1 

533.9 

542.8 

551.7 

50 

45.8 

0.323 

3.66 

1.52 

0.706 

498.6 

507.5 

516.4 

525.3 

534.1 

543.0 

551.9 

49 

44.1 

0.305 

3.45 

1.73 

0.666 

498.6 

507.5 

516.4 

525.3 

534.2 

543.1 

552.0 

48 

42.4 

0.287 

$.25 

1.93 

0.627 

498.7 

507.6 

516.5 

525.4 

534.3 

543.2 

552.1 

47 

40.7 

0.271 

3.07 

2.11 

0.593 

498.8 

507.7 

516.6 

525.5 

534.4 

543.3 

552.2 

46 

39.0 

0.255 

2.89 

2.29 

0.558 

498.9 

507.8 

516.7 

525.6 

534.5 

543.4 

552.3 

45 

37.3 

0.240 

2.73 

2.45 

0.527 

499.0 

507.9 

516.8 

525.7 

534.6 

543.5 

552.4 

44 

35.6 

0.227 

2.56 

2.62 

0.494 

499.1 

508.0 

516.9 

525.8 

534.7 

543.6 

552.5 

43 

33.9 

0.213 

2.41 

2.77 

0.465 

499.2 

508.1 

517.0 

525.9 

534.8 

543.7 

552.6 

42 

32.2 

0.201 

2.27 

2.91 

0.438 

499.3 

508.2 

517.1 

526.0 

534.9 

543.8 

552.7 

41 

30.5 

0.189 

2.14 

3.04 

0.413 

499.4 

508.3 

517.2 

526.1 

535.0 

543.9 

552.8 

40 

28.8 

0.178 

2.01 

3.17 

0.388 

499.5 

508.4 

517.3 

526.2 

535.1 

544.1 

552.9 

39 

27.1 

0.167 

1.89 

3.29 

0.365 

499.5 

508.4 

517.3 

526.2 

535.1 

544.1 

552.9 

57 

57 

57.0 

0.473 

5.34 

0.00 

1.000 

496.6 

505.5 

514.4 

523.2 

532.1 

540.9 

549.8 

56 

55.3 

0.447 

5.05 

0.29 

0.946 

496.8 

505.7 

514.6 

523.4 

532.3 

541.1 

550.0 

55 

53.6 

0.422 

4.76 

0.58 

0.891 

496.9 

505.8 

514.7 

523.5 

532.4 

541.2 

550.1 

54 

51.9 

0.398 

4.50 

0.84 

0.843 

497.1 

506.0 

514.9 

523.7 

532.6 

541.4 

550.3 

53 

50.2 

0.376 

4.25 

1.09 

0.796 

497.2 

506.1 

515.0 

523.8 

532.7 

541.5 

550.4 

52 

48.5 

0.355 

4.00 

1.34 

0.749 

497.3 

506.2 

515.1 

523.9 

532.8 

541.6 

550.5 

51 

46.8 

0.335 

3.78 

1.56 

0.709 

497.5 

506.4 

515.3 

524.1 

533.0 

541.8 

550,7 

50 

45.1 

0.316 

3.56 

1.78 

0.667 

497.6 

506.5 

515.4 

524.2 

533.1 

541.9 

550.8 

49 

43.4 

0.298 

3.36 

1.98 

0.629 

497.7 

506.6 

515.5 

524.3 

533.2 

542.0 

550.9 

48 

41.7 

0.281 

3.17 

2.17 

0.594 

497.8 

506.7 

515.6 

524.4 

533.3 

542.1 

551.0 

47 

40.0 

0.264 

2.99 

2.35 

0.560 

497.9 

506.8 

515.7 

524.5 

533.4 

542.2 

551.2 

46 

38.3 

0.249 

2.81 

2.53 

0.526 

49S.O 

506.9 

515.8 

524.6 

533.5 

542.3 

551.3 

45 

36.6 

0.235 

2.65 

2.69 

0.496 

498.1 

507.0 

515.9 

524.7 

533.6 

542.4 

551.4 

44 

34.9 

0.221 

2.50 

2.84 

0.468 

498.2 

507.1 

516.0 

524.8 

533.7 

542.5 

551.5 

43 

33.2 

0.208 

2.35 

2.99 

0.440 

498.3 

507.2 

516.1 

524.9 

533.8 

542.6 

551.6 

42 

31.5 

0.196 

2.21 

3.13 

0.414 

498:3 

507.2 

516.1 

524.9 

533.8 

542.6 

551.6 

41 

29.8 

0.184 

2.08 

3.26 

0.390 

498.4 

507.3 

516.2 

525.1 

533.9 

542.7 

551.7 

40 

28.1 

0.173 

1.96 

3.38 

0.367 

498.5 

507.4 

516.3 

525.2 

534.0 

542.8 

551.8 

116 


PSYCHROMETRICAL    TABLES. 


13 


Re 
of 
moi 
F 

Dry. 

iding 
i'her- 
ueter, 
ihr. 

Wet. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Yapor 
in 
English 
Inches. 

Weight 
of  Vapor 

1>  3 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

"Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
Foot  of 
Air. 

xxequ. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

in. 

28.0 

in. 

28.5 

in. 

29.0 

in. 

29.5 

3O.O 

in. 

30.5 

in. 
3I.O 

o 

G 

o 

in. 

gr. 

gr. 

gr. 

gr- 

gr- 

gr- 

gr- 

gr- 

gr. 

58 

58 

58.0 

0.489 

5.51 

0.00 

1.000 

495.5 

504.3 

513.2 

522.0 

530.9 

539.7 

548.6 

57 

56.3 

0.462 

5.21 

0.30 

0.946 

495.7 

504.5 

513.4 

522.2 

531.1 

539.9 

548.8 

56 

54.6 

0.437 

4.92 

0.59 

0.893 

495.8 

504.6 

513.5 

522.3 

531.2 

540.0 

548.9 

55 

52.9 

0.412 

4.64 

0.87 

0.842 

496.0 

504.8 

513.7 

522.5 

531.4 

540.2 

549.1 

54 

51.2 

0.389 

4.39 

1.12 

0.797 

496.1 

504.9 

513.8 

522.7 

531.6 

540.4 

549.3 

53 

49.5 

0.367 

4.14 

1.37 

0.751 

496.2 

505.0 

513.9 

522.8 

531.7 

540.5 

549.4 

52 

47.8 

0.346 

3.90 

1.61 

0.708 

496.4 

505.2 

514.1 

523.0 

531.9 

540.7 

549.6 

51 

46.1 

0.327 

3.68 

1.83 

0.668 

496.5 

505.3 

514.2 

523.1 

532.0 

540.8 

549.7 

50 

44.4 

0.308 

3.48 

2.03 

0.632 

496.6 

505.4 

514.3 

523.2 

532.1 

540.9 

549.8 

49 

42.7 

0.290 

3.28 

2.23 

0.595 

496.7 

505.5 

514.4 

523.3 

532.2 

541.0 

549.9 

48 

41.0 

0.274 

3.08 

2.43 

0.559 

496.8 

505.6 

514.5 

523.4 

532.3 

541.1 

550.0 

47 

39.3 

0.258 

2.91 

2.60 

0.528 

496.9 

505.7 

514.6 

523.5 

532.4 

541.2 

550.1 

46 

37.6 

0.243 

2.74 

2.77 

0.497 

497.0 

505.8 

514.7 

523.6 

532.5 

541.3- 

550.2 

43 

35.9 

0.229 

2.58 

2.93 

0.469 

497.1 

505.9 

514.8 

523.} 

532.6 

541.4 

550.3 

44 

34.2 

0.216 

2.43 

3.08 

0.441 

497.2 

506.0 

514.9 

523.8 

532.7 

541.5 

550.4 

43 

32.5 

0.203 

2.29 

3.22 

0.416 

497.3 

506.1 

515.1 

523.9 

532.8 

541.6 

550.5 

42 

30.8 

0.191 

2.15 

3.36 

0.390 

497.4 

506.2 

515.2 

524.1 

532.9 

541.7 

550.6 

41 

29.1 

0.180 

2.03 

3.48 

0.368 

497.5 

506.3 

515.3 

524.2 

533.0 

541.8 

550.7 

40 

27.4 

0.169 

1.91 

3.60 

0.347 

497.5 

506.3 

515.3 

524.2 

533.0 

541.8 

550.7 

59 

59 

59.0 

0.506 

5.69 

0.00 

1.000 

494.5 

503.3 

512.2 

521.0 

529.8 

538.6 

547.5 

58 

57.3 

0.478 

5.37 

0.32 

0.944  • 

494.6 

503.4 

512.3 

521.1 

529.9 

538.7 

547.6 

57 

55.6 

0.452 

5.08 

O.T61 

0.893 

494.7 

503.5 

512.4 

521.2 

530.0 

538.8 

547.7 

56 

53.9 

0.426 

4.79 

0.90 

0.842 

494.8 

503.6 

512.5 

521.3 

530.1 

538.9 

547.8 

55 

52.2 

0.402 

4.53 

1.16 

0.796 

494.9 

503.7 

512.6 

521.4 

530.3 

539.1 

548.0 

54 

50.5 

0.3SO 

4.28 

1.41 

0.752 

495.1 

503.9 

512.8 

521.6 

530.5 

539.3 

548.2 

53 

48.8 

0.358 

4.03 

1.66 

0.708 

495.3 

504.1 

513.0 

521.8 

530.7 

539.5 

548.4 

52 

47.1 

0.338 

3.80 

1.89 

0.668 

495.4 

504.2 

513.1 

521.9 

530.8 

539.6 

548.5 

51 

45.4 

0.319 

3.60 

2.09 

0.633 

495.5 

504.3 

513.2 

522.0 

530.9 

539.7 

548.6 

50 

43.7 

0.301 

3.39 

2.30 

0.596 

495.7 

504.5 

513.4 

522.2 

531.1 

539.9 

548.8 

49 

42.0 

0.283 

3.19 

2.50 

0.561 

495.8 

504.6 

513.4 

522.3 

531.2 

540.0 

548.9 

48 

40.3 

0.267 

3.01 

2.68 

0.529 

495.9 

504.7 

513.5 

522.4 

531.3 

540.1 

549.0 

47 

38.6 

0.252 

2.84 

2.85 

0.499 

496.0 

504.8 

513.6 

522.5 

531.4 

540.2 

549.1 

46 

36.9 

0.237 

2.67 

3.02 

0.469 

496.1 

504.9 

513.7 

522.6 

531.5 

540.3 

549.2 

45 

35.2 

0.223 

2.51 

3.18 

0.441 

496.2 

505.0 

513.8 

522.7 

531.6 

540.4 

549.3 

44 

33.5 

0.210 

2.37 

3.32 

0.417 

496.3 

505.1 

513.9 

522.8 

531.7 

540.5 

549.4 

43 

31.8 

0.198 

2.23 

3.46 

0.392 

496.4 

505.2 

514.1 

522.9 

531.8 

540.6 

549.5 

42 

30.1 

0.186 

2.09 

3.60 

0.367 

496.5 

505.3 

514.2 

523.0 

531.9 

540.7 

549.6 

41 

28.4 

0.175 

1.97 

3.72 

0.346 

496.6 

505.4 

514.3 

523.1 

532.0 

540.8 

549.7 

40 

26.7 

0.165 

1.85 

3.84 

0.325 

496.6 

505.4 

514.3 

523.1 

532.0 

540.8 

549.7 

B 


117 


14 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 

TViYYTn 

Force 

Weight 
of  Vapor 

Hu- 

Weight in  Grains  of  a  Cubic  Foot  of  Air. 

mometer, 
Fahr. 

±emp. 
of 
Dew- 

of 
Vapor 

In  a 

Reqd. 
for 

midity, 
Satura- 

Height  of  the  Barometer  in  Engh'sh  Inches. 

in 

Cubic 

Sat'n. 

tiryn  

Fahr! 

English 
Inches. 

Foot  of 
Ah". 

ofaCu- 
bic  Ft. 
of  Air. 

i.ooa 

in. 
28.0 

in. 

28.5 

in. 

29.O 

in. 

29.5 

in. 

30.0 

in. 

30.5 

in. 

31.0 

Dry. 

Wet. 

o 

o 

o 

In. 

gr- 

gr- 

gr- 

gr. 

gr. 

gr- 

gr. 

gr- 

gr- 

60 

60 

60.0 

0.523 

5.87 

0.00 

1.000 

493.4 

502.2 

511.0 

519.8 

528.6 

537.4 

546.2 

59 

58.3 

0.494 

5.54 

0.33 

0.944 

493.6 

502.4 

511.2 

520.0 

528.8 

537.6 

546.4 

58 

56.6 

.0.467 

5.24 

0.63 

0.893 

493.7 

502.5 

511.3 

520.1 

528.9 

537.7 

546.5 

57 

54.9 

0.441 

4.95 

0.92 

0.843 

493.8 

502.6 

511.4 

520.2 

529.0 

537.8 

546.6 

56 

53.2 

0.416 

4.68 

1.19 

0.797 

494.0 

502.8 

511.6 

520.4 

529.2 

538.0 

546.8 

55 

51.5 

0.393 

4.41 

1.46 

0.751 

494.2 

503.0 

511.8 

520.6 

529.4 

538.2 

547.0 

54 

49.8 

0.371 

4.17 

1.70 

0.710 

494.4 

503.2 

512.0 

520.8 

529.6 

538.4 

547.2 

53 

48.1 

0.350 

3.92 

1.95 

0.668 

494.5 

503.3 

512.1 

520.9 

529.7 

538.5 

547.4 

52 

46.4 

0.330 

3.70 

2.17 

0.630 

494.7 

503.4 

512.3 

521.1 

529.9 

538.7 

547.6 

51 

44.7 

0.311 

3.49 

2.38 

0.595 

494.8 

503.5 

512.4 

521.2 

530.0 

538.8 

547.7 

50 

43.0 

0.293 

3.29 

2.58 

0.561 

494.8 

503.6 

512.5 

521.3 

530.1 

538.9 

547.8 

49 

41.3 

0.277 

3.10 

2.77 

0.528 

494.9 

503.7 

512.6 

521.4 

530.2 

539.0 

547.9 

48 

39.6 

0.261 

2.93 

2.94 

0.499 

495.0 

503.8 

512.7 

521.5 

530.3 

539.1 

548.0 

47 

37.9 

0.24« 

2.75 

3.12 

0.468 

495.1 

503.9 

512.8 

521.6 

530.4 

539.2 

548.1 

46 

36.2 

0.231 

2.60 

3.27 

0.443 

495.2 

504.0 

512.9 

521.7 

530.5 

539.3 

548.2 

45 

34.5 

0.218 

2.45 

3.42 

0.417 

495.3 

504.1 

513.0 

521.8 

530.6 

539.4 

548.3 

44 

32.8 

0.205 

2.31 

3.56 

0.394 

495.4 

504.2 

513.1 

521.9 

530.7 

539.5 

548.4 

43 

31.1 

0.193 

2.17 

3.70 

0.370 

495.5 

504.3 

513.2 

522.0 

530.8 

539.6 

548.5 

42 

29.4 

0.182 

2.04 

3.83 

0.348 

495.6 

504.4 

513.3 

522.1 

530.9 

539.7 

548.6 

41 

27.7 

0.171 

1.92 

3.95 

0.327 

495.6 

504.4 

513.3 

522,1 

530.9 

539.7 

548.7 

61 

61 

61.0 

0.541 

6.06 

0.00 

1.000 

492.3 

501.1 

509.9 

518.7 

527.5 

536.3 

545.1 

60 

59.3 

0.511 

5.72 

0.34 

0.944 

492.5 

501.3 

510.1 

518.9 

527.7 

536.5 

545.3 

59 

57.6 

0.483 

5.40 

0.66 

0.891 

492.6 

501.4 

510.2 

519.0 

527.8 

536.6 

545.4 

58 

55.9 

0.456 

5.11 

0.95 

0.843 

492.8 

501.6 

510.4 

519.2 

528.0 

536.8 

545.6 

57 

54.2 

0.431 

4.83 

1.23 

0.797 

493.0 

501.8 

510.6 

519.4 

528.2 

537.0 

545.8 

56 

52.5 

0.407 

4.55 

1.51 

0.751 

493.1 

501.9 

510.7 

519.5 

528.3 

537.1 

545.9 

55 

50.8 

0.383 

4.30 

1.76 

0.710 

493.3 

502.1 

510.9 

519.7 

528.5 

537.3 

546.1 

54 

49.1 

0.362 

4.05 

2.01 

0.668 

493.4 

502.2 

511.0 

519.8 

528.6 

537.4 

546.2 

53 

47.4 

0.342 

3.83 

2.23 

0.632 

493.5 

502.3 

511.1 

519.9 

528.7 

537.5 

546.3 

52 

45.7 

0.322 

3.61 

2.45 

0.596 

493.6 

502.4 

511.2 

520.0 

528.8 

537.6 

546.4 

51 

44.0 

0.304 

3.40 

2.66 

0.561 

493.8 

502.6 

511.4 

520.2 

529.0 

537.8 

546.6 

50 

42.3 

0.286 

3.21 

2.85« 

0.530 

493.9 

502.7 

511.5 

520.3 

529.1 

537.9 

546.7 

49 

40.6 

0.270 

3.02 

3.04 

0.498 

494.0 

502.8 

511.6 

520.4 

529.2 

538.0 

546.8 

48 

38.9 

0.254 

2.85 

3.21 

0.470 

494.1 

502.9 

511.7 

520.5 

529.3 

538.1 

546.9 

t 

47 

37.2 

0.240 

2.69 

3.37 

0.444 

494.2 

503.0 

511.8 

520.6 

529.4 

538.2 

547.0 

46 

35.5 

0.226 

2.53 

3.53 

0.417 

494.3 

503.1 

511.9 

520.7 

529.5 

538.3 

547.1 

45 

33.8 

0.213 

2.38 

3.68 

0.393 

494.4 

503.2 

512.0 

520.8 

529.6 

538.4 

547.2 

44 

32.1 

0.200 

2.24 

3.82 

0.370 

494.5 

503.3 

512.1 

520.9 

529.7 

538.5 

547.3 

43 

30.4 

0.188 

2.11 

3.95 

0.348 

494.6 

503.4 

512.2 

521.0 

529.8 

538.6 

547.4 

42 

28.7 

0.177 

1.99 

4.07 

0.328 

494.7 

503.5 

512.3 

521.1 

529.9 

538.7 

547.5 

41 

27.0 

0.167 

1.87 

4.19 

0.309 

494.7 

503.5 

512.3 

521.1 

529.9 

538.7 

547.5 

B 


118 


PSYCHROMETRICAL    TABLES. 


15 


Heading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor. 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu 
bic  Ft 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

in. 

2S.O 

in. 

28.5 

in. 

29.O 

in. 

29.5 

in. 

30.0 

in. 

30.5 

in. 

31.0 

Dry. 

Wet. 

o 

o            o 

in. 

gr. 

gr- 

gr. 

gr. 

gr. 

gr. 

gr. 

gr. 

gr. 

62 

62        62.0 

0.559 

6.25 

0.00 

1.000 

491.2 

499.9 

508.7 

517.5 

526.3 

535.1 

543.9 

61        60.3 

0.528 

5.91 

0.34 

0.946 

491.4 

500.1 

508.9 

517.7 

526.5 

535.3 

544-1 

60 

58.6 

0.499 

5.58 

0.67 

0.893 

491.5 

500.2 

509.0 

517.8 

526.6 

535.4 

544.2 

59 

56.9 

0.472 

5.27 

0.98 

0.843 

491.7 

500.4 

509.2 

518.0 

526.8 

535.6 

544.4 

58 

55.2 

0.445 

4.99 

1.26 

0.798 

491.9 

500.6 

509.4 

518.2 

527.0 

535.8 

544.6 

57 

53.5 

0.421 

4.70 

1.55 

0.752 

492.0 

500.7 

509.5 

518.3 

527.1 

535.9 

544.7 

56 

51.8 

0.397 

4.44 

1.81 

0.710 

492.1 

500.7 

509.5 

518.4 

527.3 

536.1 

544.9 

55 

50.1 

0.375 

4.19 

2.06 

0.670 

492.2 

500.9 

509.7 

518.5 

527.4 

536.2 

545.0 

54 

48.  4 

0.354 

3.95 

2.30 

0.632 

492.4 

501.1 

509.9 

518.7 

527.6 

536.4 

545.2 

53 

46.7 

0.333 

3.72 

2.53 

0.595 

492.5 

501.3 

510.1 

518.9 

527.7 

536.5 

545.3 

52 

45.0 

0.315 

3.52 

2.73 

0.563 

492.7 

501.5 

510.3 

519.1 

527.9 

536.7 

545.5 

51 

43.3 

0.297 

3.31 

2.94 

0.530 

492.8 

501.6 

510.4 

519.2 

528.0 

536.8 

545.6 

50 

41.6 

0.280 

3.13 

3.12 

0.501 

492.9 

501.7 

510.5 

519.3 

528.1 

536.9 

545.7 

49 

39.9 

0.263 

2.95 

3.30 

0.472 

493.0 

501.8 

510.6 

519.4 

528.2 

537.0 

545.8 

48 

38.2 

0.248 

2.77 

3.48 

0.443 

493.1 

501.9 

510.7 

519.5 

528.3 

537.1 

545.9 

47 

36.5 

0.234 

2.61 

3.64 

0.418 

493.2 

502.0 

510.8 

519.6 

528.4 

537.2 

546.0 

46 

34.8 

0.220 

2.47 

3.78 

0.395 

493.3 

502.1 

5*10.9 

519.7 

528.5 

537.3 

546.1 

45 

33.1 

0.207 

2.32 

3.93 

0.371 

493.3 

502.1 

511.0 

519.7 

528.6 

537.3 

546.1 

44 

31.4 

0.195 

2.18 

4.07 

0.349 

493.4 

502.2 

511.0 

519.8 

528.6 

537.4 

546.2 

43 

29.7 

0.184 

2.06 

4.19 

0.330 

493.4 

502.2 

511.1 

519.8 

528.6 

537.4 

546.2 

42 

28.0 

0.173 

1.94 

4.31 

0.311 

493.5 

502.3 

511.2 

519.9 

528.7 

537.5 

546.3 

41 

26.3 

0.163 

1.83 

4.42 

0.293 

493.6 

502.4 

511.3 

520.0 

528.8 

537.6 

546.4 

63 

63 

63.0 

0.578 

6.45 

0.00 

1.000 

490.2 

498.9 

507.7 

516.4 

525.2 

533.9 

542.7 

62 

61.3 

0.546 

6.10 

0.35 

0.946 

490.4 

499.1 

507.9 

516.6 

525.4 

534.1 

542.9 

61 

59.6 

0.516 

5.76 

0.69 

0.893 

490.5 

499.2 

508.0 

516.7 

525.5 

534.2 

543.0 

60 

57.9 

0.488 

5.44 

1.01 

0.843 

490.7 

499.4 

508.2 

516.9 

525.7 

534.4 

543.2 

59 

56.2 

0.461 

5.15 

1.30 

0.798 

490.9 

499.6 

508.4 

517.1 

525.9 

534.6 

543.4 

58 

54.5 

0.435 

4.86 

1.59* 

0.753 

491.0 

499.7 

508.5 

517.2 

526.0 

534.7 

543.5 

57 

52.8 

0.411 

4.59 

1.86 

0.712 

491.1 

499.8 

508.6 

517.3 

526.2 

534.9 

543.7 

56 

51.1 

0.388 

4.33 

2.12 

0.671 

491.2 

499.9 

508.7 

517.4 

526.3 

535.0 

543.8 

55 

49.4 

0.366 

4.09 

2.36 

0.634 

491.3 

500.0 

508.8 

517.5 

526.4 

535.1 

543.9 

54 

47.7 

0.345 

3.85 

2.60 

0.597 

491.5 

500.2 

509.0 

517.7 

526.6 

535.3 

544.1 

53 

46.0 

0.326 

3.63 

2.82 

0.563 

491.7 

500.4 

509.2 

518.0 

526.8 

535.5 

544.3 

52 

44.3 

0.307 

3.43 

3.02 

0.532 

491.8 

500.5 

509.3 

518.1 

526.9 

535.6 

544.4 

51 

42.6 

0.289 

3.24 

3.21 

0.502 

491.9 

500.6 

509.4 

518.2 

527.0 

535.7 

544.5 

50 

40.9 

0.273 

3.05 

3.40 

0.473 

492.0 

500.7 

509.5 

518.3 

527il 

535.8 

544.6 

49 

39.2 

0.257 

2.07 

3.58 

0.445 

492.1 

500.8 

509.6 

518.4 

527.2 

535.9 

544.7 

48 

37.5 

0.242 

2.71 

3.74 

0.420 

492.2 

500.9 

509.7 

518.5 

527.3 

536.0 

544.8 

47 

35.8 

0.228 

2.56 

3.89 

0.397 

492.3 

501.0 

509.8 

518.6 

527.4 

536.1 

544.9 

46 

34.1 

0.215 

2.41 

4.04 

0.374 

492.4 

501.1 

509.9 

518.7 

527.5 

536.2 

545.0 

45 

32.4 

0.202 

2.26 

4.19 

0.351 

492.5 

501.2 

510.0 

518.8 

527.6 

536.3 

545.1 

44 

30.7 

0.190 

2.13 

4.32 

0.330 

492.5 

501.2 

510.0 

518.8 

527.6 

536.3 

545.1 

43 

29.0 

0.179 

2.00 

4.45 

0.310 

492.6 

501.3 

510.1 

518.9 

527.7 

536.4 

545.2 

42 

27.3 

0.168 

1.87 

4.58 

0.290 

492.7 

501.4 

510.2 

519.0 

527.8 

536.5 

545.3 

B 


119 


16 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fafar. 

Temp, 
of* 
Dew- 
Point, 

Fahr. 

Force 
of 
Yapor 
in 
English 
Inches. 

Weight 
of  Vapor. 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

o. 
64 

Wet. 

in. 

38.0 

in. 
28.5 

in. 

29.O 

in. 

29.5 

in. 

30.0 

in. 
30.5 

in. 

31.O 

0 

64 

o 
64.0 

in. 
0.597 

gr- 
6.65 

gr. 
0.00 

1.000 

gr. 
489.1 

gr. 
497.8 

gr. 
506.6 

gr. 
515.3 

gr. 
524.0 

gr- 
532.7 

gr. 
541.5 

63 

62.3 

0.565 

6.29 

0.36 

0.946 

489.3 

49S.O 

506.8 

515.5 

524.2 

532.9 

541.7 

62 

60.6 

0.534 

5.94 

0.71 

0.893 

489.5 

498.2 

507.0 

515.7 

524.4 

533.1 

541.9 

61 

58.9 

0.504 

5.61 

1.04 

0.843 

489.7 

498.4 

507.2 

515.9 

524.6 

533.3 

542.1 

60 

57.2 

0.476 

5.31 

1.34 

0.798 

489.9 

498.6 

507.4 

516.1 

524.8 

533.5 

542.3 

59 

55.5 

0.450 

5.01 

1.64 

0.753 

490.0 

498.7 

507.5 

516.2 

524.9 

533.6 

542.4 

58 

53.8 

0.425 

4.73 

1.92 

0.711 

490.1 

498.8 

507.6 

516.3 

525.1 

533.8 

542.6 

57 

52.1 

0.401 

4.47 

2.18 

0.672 

490.2 

498.9 

507.7 

516.4 

525.2 

533.9 

542.7 

56 

50.4 

0.379 

4.23 

2.42 

0.636 

490.4 

499.1 

507.9 

516.6 

525.4 

534.1 

542.9 

55 

48.7 

0.357 

3.98 

2.67 

0.598 

490.5 

499.2 

508.0 

516.7 

525.5 

534.2 

543.0 

54 

47.0 

0.337 

3.75 

2.90 

0.564 

490.7 

499.4 

508.2 

516.9 

525.7 

534.4 

543.2 

53 

45.3 

0.318 

3.55 

3.10 

0.534 

490.8 

499.5 

508.3 

517.0 

525.8 

534.5 

543.3 

52 

43.6 

0.300 

3.34 

3.31 

0.502 

490.9 

499.6 

508.4 

517.1 

525.9 

534.6 

543.4 

51 

41.9 

0.282 

3.15 

3.50 

0.473 

491.0 

499.7 

508.5 

517.2 

526.0 

534.7 

543.5 

50 

40.2 

0.266 

2.96 

3.69 

0.445 

491.2 

499.9 

508.7 

517.4 

526.1 

534.9 

543.7 

49 

38.5 

0.251 

2.79 

3.86 

0.419 

491.3 

500.0 

508.8 

517.5 

526.2 

535.0 

543.8 

48 

36.8 

0.236 

2.63 

4.02 

0.396 

491.4 

500.1 

508.9 

517.6 

526.3 

535.1 

543.9 

47 

35.1 

0.223 

2.47 

4.18 

0.372 

491.5 

500.2 

509.0 

517.7 

526.4 

535.2 

544.0 

46 

33.4 

0.210 

2.33 

4.32 

0.351 

491.6 

500.3 

509.1 

517.8 

526.5 

535.3 

544.1 

45 

31.7 

0.197 

2.19 

4.46 

0.330 

491,7 

500.4 

509.2 

517.9 

526.6 

535.4 

544.2 

44 

30.0 

0.186 

2.06 

4.59 

0.310 

491.7 

500.4 

509.2 

517.9 

526.6 

535.4 

544.2 

43 

28.3 

0.175 

1.94 

4.71 

0.292 

491.8 

500.5 

509'.  3 

518.0 

526.7 

535.5 

544.3 

42 

26.6 

0.164 

1.83 

4.82 

0.275 

491.9 

500.6 

509.4 

518.1 

526.8 

535.6 

544.4 

65 

65 

65.0 

0.617 

6.87 

0.00 

1.000 

488.1 

496.8 

505.5 

514.2 

522.9 

531.6 

540.3 

64 

63.4 

0.586 

6.51 

0.36 

0.947 

488.3 

497.0 

505.7 

514.4 

523.1 

531.8 

540.5 

63 

61.8 

0.555 

6.17 

0.70 

0.898 

488.5 

497.2 

505.9 

514.6 

523.3 

532.0 

540.7 

62 

60.2 

0.527 

5.85 

1.02 

0.851 

488.7 

497.4 

506.1 

514.8 

523.5 

532.2 

540.9 

61 

58.6 

0.499 

5.55 

1.32 

0.808 

488.9 

497.6 

506.3 

515.0 

523.7 

532.4 

541.1 

60 

57.0 

0.473 

5.25 

1.62 

0.765 

489.0 

497.7 

506.5 

515.2 

523.9 

532.6 

541.3 

59 

55.4 

0.449 

4.98 

1.89 

0.725 

489.1 

497.8- 

506.6 

515.3 

524.0 

532.7 

541.5 

5S 

53.8 

0.425 

4.72 

2.15 

0.687 

489.3 

498.0 

506.8 

515.5 

524.2 

532.9 

541.7 

57 

52.2 

0.402 

4.47 

2.40 

0.651 

489.4 

498.1 

506.9 

515.6 

524.3 

533.0 

541.8 

56 

50.6 

0.381 

4.23 

2.64 

0.616 

489.6 

498.3 

507.1 

515.8 

524.5 

533.2 

542.0 

55 

49.0 

0.361 

4.01 

2.86 

0.584 

489.7 

498.4 

507.2 

515.9 

524.6 

533.3 

542.1 

54 

47.4 

0.342 

3.79 

3.08 

0.552 

489.8 

498.5 

507.3 

516.0 

524.7 

533.4 

542.2 

53 

45.8 

0.323 

3.60 

3.27 

0.524 

489.9 

498.6 

507.4 

516.1 

524.8 

533.5 

542.3 

52 

44.2 

0.306 

3.39 

3.48 

0.493 

490.0 

498.7 

507.5 

516.2 

524.9 

533.6 

542.4 

51 

42.6- 

0.289 

3.22 

3.65 

0.469 

490.1 

498.8 

507.6 

516.3 

525.0 

533.7 

542.5 

50 

41.0 

0.274 

3.04 

3.83 

0.442 

490.2 

498.9 

507.7 

516.4 

525.1 

533.8 

542.6 

49 

39.4 

0.259 

2.87 

4.00 

0.418 

490.3 

499.0 

507.8 

516.5 

525.2 

533.9 

542.7 

48 

37.8 

0.245 

2.72 

4.15 

0.396 

490.3 

499.0 

507.8 

516.5 

525.2 

533.9 

542.7 

47 

36.2 

0.231 

2.57 

4.30 

0.374 

490.4 

499.1 

507.9 

516.6 

525.3 

534.0 

542.8 

46 

34.6 

0.219 

2.43 

4.44 

0.354 

490.5 

499.2 

508.0 

516.7 

525.4 

534.1 

542.9 

45 

33.0 

0.207 

2.31 

4.56 

0.336 

490.6 

499.3 

508.1 

516.8 

525.5 

534.2 

543.0 

44 

31.4 

0.195 

2.17 

4.70 

0.316 

490.7 

499.4 

508.2 

516.9 

525.6 

534.3 

543.1 

43 

29.8 

0.184 

2.05 

4.82 

0.299 

490.7 

499.4 

508.2 

516.9 

525.6 

534.3 

543.1 

42 

28.2 

0.174 

1.94 

4.93 

0.283 

490.8 

499.5 

508.3 

517.0 

525.7 

534.4 

543.2 

B 


120 


PSYCHROMETRICAL    TABLES. 


17 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point. 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

jn,equ. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

in. 

28.O 

in. 

23.5 

in. 

29.0 

in. 

29.5 

in. 

30.0 

in. 

30.5 

in. 

31.0 

Dry. 

Wet. 

o 

o 

o 

in. 

gr. 

gr. 

gr. 

gr. 

gr. 

gr. 

gr. 

gr- 

gr. 

66 

66 

66.0 

0.638 

7.08 

0.00 

1.000 

487.0 

495.7 

504.4 

513.1 

521.8 

530.5 

539.2 

65 

64.4 

0.605 

6.72 

0.36 

0.949 

487.2 

495.9 

504.6 

513.3 

522.0 

530.7 

539.4 

64 

62.8 

0.574 

6.35 

0.73 

0.897 

487.3 

496.0 

504.7 

513.4 

522.1 

530.8 

539.5 

63 

61.2 

0.544 

6.04 

1.04 

0.853 

487.5 

496.2 

504.9 

513.6 

522.3 

531.0 

539.7 

62 

59.6 

0.516 

5.72 

1.36 

0.808 

487.7 

496.4 

505.1 

513.8 

522.5 

531.2 

539.9 

61 

58.0 

0.489 

5.42 

1.66 

0.766 

487.9 

496.6 

505.3 

514.0 

522.7 

531.4 

540.1 

60 

56.4 

0.464 

5.14 

1.94 

0.726 

488.0 

496.7 

505.4 

514.1 

522.8 

531.5 

540.2 

59 

54.8 

0.440 

4.88 

2.20 

0.689 

488.1 

496.8 

505.5 

514.2 

523.0 

531.7 

540.4 

58 

53.2 

0.416 

4.62 

2.46 

0.652 

488.2 

496.9 

505.6 

514.3 

523.1 

531.8 

540.5 

57 

51.6 

0.394 

4.37 

2.71 

0.619 

488.4 

497.1 

505.8 

514.5 

523.3 

532.0 

540.7 

56 

50.0 

0.373 

4.15 

2.93 

0.586 

488.5 

497.2 

505.9 

514.6 

523.4 

532.1 

540.8 

55 

48.4 

0.354 

3.92 

3.16 

0.553 

488.6 

497.3 

506.1 

514.8 

523.5 

532.2 

541.0 

54 

46.8 

0.335 

3.72 

3.36 

0.525 

488.8 

497.5 

506.3 

515.0 

523.7 

532.4 

541.2 

53 

45.2 

0.317 

3.51 

3.57 

0.496 

488.9 

497.6 

506.4 

515.1 

523.8 

532.5 

541.3 

52 

43.6 

0.300 

3.33 

3.75 

0.470 

489.0 

497.7 

506.5 

515.2 

523.9 

532.6 

541.4 

51 

42.0 

0.283 

3.14 

3.94 

0.443 

489.1 

497.8 

506.6 

515.3 

524.0 

532.7 

541.5 

50 

40.4 

0.268 

2.97 

4.11 

0.419 

489.2 

497.9 

506.7 

515.4 

524.1 

532.8 

541.6 

49 

38.8 

0.253 

2.81 

4.27 

0.397 

489.3 

498.0 

506.8 

515.5 

524.2 

532.9 

541.7 

43 

37.2 

0.240 

2.66 

4.42 

0.376 

489.4 

498.1 

506.9 

515.6 

524.3 

533.0 

5*41.8 

47 

35.6 

0.227 

2.51 

4.57 

0.355 

489.4 

498.1 

506.9 

,515.6 

524.3 

533.0 

541.8 

46 

34.0 

0.214 

2.37 

4.71 

0.335 

489.5 

498.2 

507.0 

515.7 

524.4 

533.1 

541.9 

45 

32.4 

0.202 

2.24 

4.84 

0.316 

489.6 

498.3 

507.1 

515.8 

524.5 

533.2 

542.0 

44 

30.8 

0.191 

2.12 

4.96 

0.299 

489.7 

498.4 

507.2 

515.9 

524.6 

533.3 

542.1 

43 

29.2 

0.180 

2.00 

5.0S 

0.283 

489.7 

498.4 

507.2 

515.9 

524.6 

533.3 

542.1 

67 

67 

67.0 

0.659 

7.30 

0.00 

1.000 

485.9 

494.6 

503.3 

512.0 

520.6 

529.3 

538.0 

66 

65.4* 

0.626 

6.93 

0.37 

0.949 

486.1 

494.8 

503.5 

512.2 

520.8 

529.5 

538.2 

65 

63.8 

0.593 

6.55 

0.75 

0.897 

4S6.3 

495.0 

503.7 

512.4 

521.0 

529.7 

538.4 

64 

62.2 

0.563 

6.23 

1.07 

0.853 

486.5 

495.2 

503.9 

512.6 

521.2 

529.9 

538.6 

63 

60.6 

0.534 

5.91 

1.39 

0.810 

486.7 

495.4 

504.1 

512.8 

521.4 

530.1 

538.8 

62 

59.0 

0.506 

5.60 

1.70 

0.767 

486.8 

495.5 

504.2 

512.9 

521.6 

530.3 

539.0 

61 

57.4 

0.480 

5.31 

1.99 

0.728 

486.9 

495.6 

504.3 

513.0 

521.7 

530.4 

539.1 

60 

55.8 

0.455 

5.04 

2.26 

0.691 

487.1 

495.8 

504.5 

513.2 

521.9 

530.6 

539.3 

59 

54.2 

0.431 

4.77 

2.53 

0.653 

487.2 

495.9 

504.6 

513.3 

522.0 

530.7 

539.4 

58 

52.6 

0.408 

4.52 

2.78 

0.619 

.487.3 

496.0 

504.7 

5ia.4 

522.1 

530.8 

539.5 

57 

51.0 

0.386 

4.28 

3.02 

0.586 

487.5 

496.2 

504.9 

513.6 

522.3 

531.0 

539.7 

56 

49.4 

0.366 

4.05 

3.25 

0.555 

487.6 

496.3 

505.0 

513.7 

522.4 

531.1 

539.8 

55 

47.8 

0.346 

3.83 

3.47 

0.524 

487.8 

496.5 

505.1 

513.8 

522.6 

531.2 

549.9 

54 

46.2 

0.328 

3.62 

3.68 

0.496 

487.9 

496.6 

505.2 

513.9 

522.7 

531.3 

540.0 

53 

44.6 

0.310 

3.43 

3.87 

0.470 

488.0 

496.7 

505.3 

514.0 

522.8 

531.4 

540.1 

52 

43.0 

0.293 

3.25 

4.05 

0.445 

488.1 

496.8 

504.4 

514.1 

522.9 

531.5 

540.2 

51 

41.4 

0.278 

3.08 

4.22 

0.422 

488.2 

496.9 

505.5 

514.2 

523.0 

531.6 

540.3 

50 

39.8 

0.263 

2.91 

4.39 

0.399 

488.4 

497.1 

505.7 

514.4 

523.1 

531.8 

540.5 

49 

38.2 

0.248 

2.75 

4.55 

0.377 

'488.5 

497.2 

505.8 

514.5 

523.2 

531.9 

540.6 

B 


121 


18 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion — 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

Wet. 

1.000. 

•  in. 

28.O 

in. 
28.5 

in. 

29.0 

in. 
29.5 

in. 

3O.O 

in. 

3O.5 

in. 

31.O 

o 
67 

0 

49 

0 

38.2 

in. 
0.248 

gr. 
2.75 

gr- 
4.55 

0.377 

gr- 

488.5 

gr. 

497.2 

gr. 
505.8 

gr- 
514.5 

gr. 
523.2 

gr- 
531.9 

gr- 
540.6 

48 

36.6 

0.235 

2.60 

4.70 

0.356 

488.6 

497.3 

505.9 

514.6 

523.3 

532.0 

540.7 

47 

35.0 

0.222 

2.46 

4.84 

0.337 

488.7 

497.4 

505.9 

514.7 

523.4 

532.1 

540.8 

46 

33.4 

0.210 

2.32 

4.98 

0.318 

488.7 

497.4 

506.0 

514.7 

523.4 

532.1 

540.8 

45 

31.8 

0.198 

2.19 

5.11 

0.301 

488.8 

497.5 

506.1 

514.8" 

523.5 

532.2 

540.9 

44 

30.2 

0.187 

2.07 

5.23 

0.284 

488.9 

497.6 

506.2 

514.9 

523.6 

532.3 

541.0 

68 

68 

68.0 

0.681 

7.53 

0.00 

1.000 

484.9 

493.5 

502.2 

510.8 

519.5 

528.1 

536.8 

67 

66.4 

0.646 

7.15 

0.38 

0.949 

485.1 

493.8 

502.5 

511.1 

519.7 

528.4 

537.1 

66 

64.8 

0.613 

6.77 

0.76 

0.899 

485.3 

494.0 

502.6 

511.2 

519.9 

528.6 

537.3 

65 

63.2 

0.582 

6.43 

1.10 

0.854 

485.5 

494.2 

502.8 

511.4 

520.1 

528.8 

537.5 

64 

61.6 

0.552 

6.10 

1.43 

0.810 

485.7 

494.4 

503.0 

511.6 

520.3 

529.0 

537.7 

63 

60.0 

0.523 

5.78 

1.75 

0.768 

485.8 

494.5 

503.1. 

511.8 

520.5 

529.2 

537.9 

62 

58.4 

0.496 

5.47 

2.06 

0.726 

485.9 

494.6 

503.3 

512.0 

520.7 

529.4 

538.1 

61 

56.8 

0.470 

5.20 

2.33 

0.691 

486.0 

494.7 

503.4 

512.1 

520.8 

529.5 

538.3 

60 

55.2 

0.445 

4.93 

2.60 

0.655 

486.2 

494.9 

503.6 

512.3 

521.0 

529.7 

538.5 

59 

53.6 

0.422 

4.67 

2.86 

0.620 

486.3 

495.0 

503.7 

512.4 

521.1 

529.8 

538.6 

58 

52.0 

0.400 

4.42 

3.11 

0.587 

486.4 

495.1 

503.8 

512.5 

521.2 

529.9 

538.6 

57 

50.4 

0.379 

4.19 

3.34 

0.556 

486.6 

495.3 

504.0 

512.7 

521.4 

530.1 

538.8 

56 

48.8 

0.358 

3.96 

3.57 

0.526 

486.7 

495.4 

504.1 

512.8 

521.5 

530.2 

538.9 

55 

47.2 

0.339 

3.75 

3.78 

0.498 

486.8 

495.5 

504.2 

512.9 

521.6 

530.3 

539.0 

54 

45.6 

0.321 

3.54 

3.99. 

0.470 

486.9 

495.6 

504.3 

513.0 

521.7 

530.4 

539,1 

53 

44.0 

0.304 

3.35 

4.18 

0.445 

487.0 

495.7 

504.4 

513.1 

521.8 

530.5 

539.2 

52 

42.4 

0.287 

3.17 

4.36 

0.421 

487.1 

495.8 

504.5 

513.2 

521.9 

530.6 

539.3 

51 

40.8 

0.272 

3.00 

4.53 

0.399 

487.2 

495.9 

504.6 

513.3 

522.0 

530.7 

539.4 

50 

39.2 

0.257 

2.84 

4.69 

0.377 

487.3 

496.0 

504.7 

513.4 

522.1 

530.8 

539.5 

49 

37.6 

0.243 

2.68 

4.85 

0.356 

487.4 

496.1 

504.8 

513.5 

522.2 

530.9 

539.6 

48 

36.0 

0.230 

2.54 

4.99 

0.337 

487.5 

496.2 

504.9 

513.6 

522.3 

531.0 

539.7 

47 

34.4 

0.217 

2.40 

5.13 

0.319 

487.6 

496.3 

505.0 

513.7 

522.4 

581.1 

539.8 

46 

32.8 

0.205 

2.27 

5.26 

0.302 

487.6 

496.3 

505.0 

513.7 

522.4 

531.1 

539.8 

45 

31.2 

0.194 

2.15 

5.38 

0.286 

487.7 

496.4 

505.1 

513.8 

522.5 

531.2 

539.9 

44 

29.6 

0.183 

2.04 

5.49 

0.271 

487.8 

496.5 

505.2 

513.9 

522.6 

531.3 

540.0 

69 

69 

69.0 

0.704 

7.76 

0.00 

1.000 

483.8 

492.4 

501.1 

509.7 

518.3 

527.0 

535.6 

68 

67.4 

0.668 

7.37 

0.39 

0.950 

484.0 

492.6 

501.3 

509.9 

518.5 

527.2 

535.8 

67 

65.8 

0.634 

'7.00 

0.76 

0.902 

484.2 

492.8 

501.5 

510.1 

518.7 

527.4 

536.0 

66 

64.2 

0.601 

6.63 

1.13 

0.854 

484.4 

493.0 

501.7 

510.3 

518.9 

527.6 

536.2 

65 

62.6 

0.570 

6.29 

1.47 

0.810 

484.6 

493.2 

501.9 

510.5 

519.1 

527.8 

536.4 

64 

61.0 

0.541 

5.97 

1.79 

0.769 

484.8 

493.4 

502.1 

510.7 

519.3 

528.0 

536.6 

63 

59.4 

0.513 

5.65 

2.11 

0.728 

485.0 

493.6 

502.3 

510.9 

519.5 

528.2 

536.8 

62 

57.8 

0.486 

5.37 

2.39 

0.693 

485.1 

493.7 

502.4 

511.0 

519.6 

528.3 

536.9 

61 

56.2 

0.461 

5.09 

2.67 

0.657 

485.1 

493.7 

502.6 

511.2 

519.8 

528.5 

537.1 

60 

54.6 

0.437 

4.82 

2.94 

0.621 

485.2 

493.9 

502.7 

511.3 

519.9 

528.6 

537.3 

59 

53.0 

0.414 

4.57 

3.19 

0.589 

485.4 

494.1 

502.8 

511.5 

520.1 

528.8 

537.5 

58 

51.4 

0.392 

4.33 

3.43 

0.558 

485.5 

494.2 

502.9 

511.6 

520.2 

528.9 

537.6 

B 


122 


PSYCHROMETRICAL    TABLES. 


19 


Heading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 

1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

Ina 

Cubic 
Foot  of 
Air. 

ivequ. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

in. 

28.0 

in. 

28.5 

in. 

29.0 

in. 

20.5 

in. 

30.0 

in. 
30.5 

in. 
31.0 

Dry. 

Wet. 

o 

o 

o 

in. 

gr. 

gr. 

gr. 

gr. 

gr- 

gr. 

gr. 

gr. 

gr. 

69 

58 

51.4 

0.392 

4.33 

3.43 

0.558 

485.5 

494.2 

502.9 

511.6 

520.2 

528.9 

537.6 

57 

49.8 

0.371 

4.09 

3.67 

0.527 

485.7 

494.4 

503.1 

511.8 

520.4 

529.1 

537.8 

56 

48.2 

0.351 

3.87 

3.89 

0.499 

485.8 

494.5 

503.2 

511.9 

520.5 

529.2 

537.9 

55 

46.6 

0.332 

3.66 

4.10 

0.472 

485.9 

494.6 

503.3 

512.0 

520.6 

529.3 

538.0 

54 

45.0 

0.315 

3.47 

4.29 

0.447 

486.0 

494.7 

503.4 

512.1 

520.7 

529.4 

538.1 

53 

43.4 

0.298 

3.29 

4.47 

0.424 

486.1 

494.8 

503.5 

512.2 

520.8 

529.5 

538.2 

52 

41.8 

0.282 

3.11 

4.65 

0.401 

486.2 

494.9 

503.6 

512.3 

520.9 

529.6 

538.3 

51 

40.2 

0.266 

2.94 

4.82 

0.379 

486.3 

495.0 

503.7 

512.4 

521.0 

529.7 

538.4 

50 

38.6 

0.252 

2.78 

4.98 

0.358 

486.4 

495.1 

503.8 

512.5 

521.1 

529.8 

538.5 

49 

37.0 

0.238 

2.63 

5.13 

0.339 

486.5 

495.2 

503.9 

512.6 

521.2 

529.9 

538.6 

48 

35.4 

0.225 

2.49 

5.27 

0.321 

486.6 

495.3 

504.0 

512.7 

521.3 

530.0 

538.7 

47 

33.8 

0.213 

2.34 

5.42 

0.302 

486.7 

495.4 

504.1 

512.8 

521.4 

530.1 

538.8 

46 

32.2 

0.201 

2.20 

5.56 

0.284 

486.8 

495.5 

504.2 

512.9 

521.5 

530.2 

538.9 

45 

30.6 

0.190 

2.06 

5.70 

0.266 

486.8 

495.5 

504.2 

512.9 

521.5 

530.2 

538.9 

70 

70 

70.0 

0.727 

8.00 

0.00 

1.000 

482.8 

491.4 

500.0 

508.6 

517.2 

525.8 

534.4 

69 

68.5 

0.692 

7.62 

0.38 

0.953 

483.0 

491.6 

500.2 

508.8 

517.4 

526.0 

534.6 

68 

67.0 

0.659 

7.26 

0.74 

0.907 

483.2 

491.8 

500.4 

509.0 

517.6 

526.2 

534.8 

67 

65.5 

0.628 

6.91 

1.09 

0.865 

483.3 

491.9 

500.5 

509.1 

517.7 

526.3 

534.9 

66 

64.0 

0.597 

6.57 

1.43 

0.822 

483.5 

492.1 

500.7 

509.3 

517.9 

526.5 

535.1 

65 

62.5 

0.568 

6.25 

1.75 

0.781 

483.7 

492.3 

500.9 

509.5 

518.1 

526.7 

535.3 

64 

61.0 

0.541 

5.95 

2.05 

0.744 

483.8 

492.4 

501.0 

509.6 

518.3 

526.9 

535.5 

63 

59.5 

0.515 

5.66 

2.34 

0.708 

484.0 

492.6 

501.2 

509.8 

518.5 

527.1 

535.7 

62 

58.0 

0.489 

5.38 

2.62 

0.672 

484.2 

492.8 

501.4 

510.0 

518.7 

527.3 

535.9 

61 

56.5 

0.465 

5.12 

2.88 

0.640 

484.3 

492.9 

501.5 

510.1 

518.8 

527.4 

536.0 

60 

55.0 

0.442 

4.87 

3.13 

0.609 

484.4 

493.0 

501.6 

510.2 

518.9 

527.5 

536.1 

59 

53.5 

0.421 

4.62 

3.38 

0.578 

484.6 

493.2 

501.8 

510.4 

519.1 

527.7 

536.3 

58 

52.0 

0,400 

4.40 

3.60 

0.550 

484.7 

493.3 

501.9 

510.5 

519.2 

527.8 

536.4 

57 

50.5 

0.380 

4.18 

3.82 

0.522 

484.8 

493.4 

502.0 

510.6 

519.3 

527.9 

536.5 

56 

49.0 

0.361 

3.96 

4.04 

0.495 

484.9 

493.5 

502.1 

510.7 

519.4 

528.0 

536.6 

55 

47.5 

0.343 

3.76 

4.24 

0.470 

485.1 

493.7 

502.3 

510.9 

519.6 

528.2 

536.8 

54 

46.0 

0.326 

3.57 

4.43 

0.446 

485.2 

493.8 

502.4 

511.0 

519.7 

528.3 

536.9 

53 

44.5 

0.309 

3.40 

4.60 

0.425 

485.3 

493.9 

502.5 

511.1 

519.8 

528.4 

537.0 

52 

43.0 

0.292 

3.23 

4.77 

0.404 

485.4 

494.0 

502.6 

511.2 

519.9 

528.5 

537.1 

51 

41.5 

0.279 

3.07 

4.93 

0.384 

485.5 

494.1 

502.7 

511.3 

520.0 

528.6 

537.2 

50 

40.0 

0.264 

2.81 

5.19 

0.351 

485.5 

494.1 

502.7 

511.3 

520.0 

528.6 

537.2 

49 

38.5 

0.251 

2.76 

5.24 

0.345 

485.6 

494.2 

502.8 

511.4 

520.1 

528.7 

537.3 

48 

37.0 

0.238 

2.63 

5.87 

0.329 

485.7 

494.3 

502.9 

511.5 

520.2 

528.8 

537.4 

47 

35.5 

0.226 

2.50 

5.50 

0.313 

485.8 

494.4 

503.0 

511.6 

520.3 

528.9 

537.5 

46 

34.0 

0.214 

2.37 

5.63 

0.296 

485.8 

494.4 

503.0 

511.6 

520.3 

528.9 

537.5 

45 

32.5 

0.203 

2.24 

5.76 

0.280 

485.9 

494.5 

503.1 

511.7 

520.4 

529.0 

537.6 

44 

31.0 

0.192 

2.12 

5.88 

0.265 

486.0 

494.6 

503.2 

511.8 

520.5 

529.1 

537.7 

43 

29.5 

0.182 

2.01 

5.99 

0.251 

486.1 

494.7 

503.3 

511.9 

520.6 

529.2 

537.8 

B 


123 


20 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ttier- 

Temp 

Force 

Weight 
of  Vapor 

Hu- 

Weight in  Grains  of  a  Cubic  Foot  of  Air. 

mometer, 
Fahr. 

of 
Dew- 
Point, 

of 
Vapor 
in 

In  a 
Cubic 

Reqd. 

for 
Sat'n. 

midity, 
Satura- 
tion —  - 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

Wet. 

Fahr. 

English 
Inches. 

Foot  of 
Air. 

ofaCu 
bic  Ft 
of  Air. 

1.000. 

in. 

38.O 

in. 

28.5 

in. 

29.0 

in. 

29.5 

in. 

30.0 

3O.5 

in. 

31.0 

0 

0 

0 

in. 

gr. 

gr. 

gr. 

gr. 

gr- 

gr. 

gr. 

gr 

gr- 

71 

71 

71.0 

0.751 

8.25 

0.00 

1.000 

481.6 

490.2 

498.8 

507.4 

516.0 

524.6 

533.2 

70 

69.5 

0.715 

7.86 

0.39 

0.953 

481.8 

490.4 

499.0 

507.6 

516.2 

524-8 

533.4 

69 

68.0 

0.681 

7.48 

0.77 

0.907 

482.0 

490.6 

499.2 

507.8 

516.4 

525.0 

533.6 

68 

66.5 

0.648 

7.13 

1.12 

0.865 

482.2 

490.8 

499.4 

508.0 

516.6 

525.2 

533.8 

67 

65.0 

0.617 

6.79 

1.46 

0.823 

482.4 

491.0 

4*99.6 

50S.2 

516.8 

525,4 

534.0 

66 

63.5 

0.588 

6.45 

1.80 

0.782 

482.6 

491.2 

499.8 

508.4 

517.0 

525.6 

534.2 

65 

62.0 

0.559 

6.14 

2.11 

0.744 

482.8 

491.4 

500.0 

508.6 

517.2 

525.8 

534.4 

64 

60.5 

0.532 

5.85 

2.40 

0.709 

483.0 

491.6 

500.2 

508.8 

517.4 

526.0 

534.6 

63 

59.0 

0.506 

5.56 

2.69 

0.674 

483.1 

491.7 

500.3 

508.9 

517.5 

526.1 

534.7 

62 

57.5 

0.481 

5.28 

2.97 

0.640 

483.2 

491.8 

500.4 

509.0 

517.7 

526.3 

534.9 

61 

56.0 

0.458 

5.03 

3.22 

0.609 

483.3 

491.9 

500.5 

509.1 

517.8 

526.4 

535.0 

60 

54.5 

0.435 

4.78 

3.47 

0.579 

483.5 

492.1 

500.7 

509.3 

518.0 

526.6 

535.1 

59 

53.0 

0.414 

4.54 

3.71 

0-550 

483.6 

492.2 

500.8 

509.4 

518.1 

526.7 

535.2 

58 

51.5 

0.393 

4.31 

3.94 

0.522 

483.8 

492.4 

501.0 

509.6 

518.3 

526.9 

535.4 

.«•* 

* 

57 

50.0 

0.373 

4.10 

4.15 

0.497 

483.9 

492.5 

501.1 

509.7 

518.4 

527.0 

535.5 

56 

48.5 

0.355 

3.89 

4.36 

0.471 

484.0 

492.6 

501.2 

509.9 

518.5 

527.1 

535.6 

55 

47.0 

0.337 

3.69 

4.56 

0.447 

484.1 

492.7 

501.3 

510.0 

518.6 

527.2 

535.7 

54 

45.5 

0.320 

3.51 

4.74 

0.425 

484.2 

492.8 

501.4 

510.1 

518.7 

527.3 

535.8 

53 

44.0 

0.304 

3.33 

4.92 

0.404 

484.3 

492.9 

501.5 

510.2 

518.8 

527.4 

535.9 

52 

42.5 

0.288 

3.16 

5.09 

0.383 

484.4 

493.0 

501.6 

510.3 

518.9 

527.5 

536.0 

51 

41.0 

0.274 

3.00 

5.25 

0.364 

484.5 

493.1 

501.7 

510.4 

519.0 

527.6 

536.1 

50 

39.5 

0.260 

2.85 

5.40 

0.345 

484.6 

493.2 

501.8 

510.5 

519.1 

527.7 

536.2 

49 

38.0 

0.246 

2.70 

5.55 

0.327 

484.7 

493.3 

501.9 

510.6 

519.2 

527.8 

536.3 

48 

36.5 

0.234 

2.57 

5.68 

0.312 

484.7 

493.3 

501.9 

510.6 

519.2 

527.8 

536.3 

47 

35.0 

0.222 

2.44 

5.81 

0.296 

484.8 

493.4 

502.0 

510.7 

519.3 

527.9 

536.4 

46 

33.5 

0.210 

2.31 

5.94 

0.280 

484.9 

493.5 

502.1 

510.8 

519.4 

528.0 

536.5 

45 

32.0 

0.199 

2.19 

6.06 

0.265 

485.0 

493.6 

502.2 

510.9 

519.5 

528.1 

536.6 

44 

30.5 

0.189 

2.08 

6.17 

0.252 

485.0 

493.6 

502.2 

510.9 

519.5 

528.1 

536.6 

72 

72 

72.0 

0.776 

8.50 

0.00 

1.000 

480.6 

489.2 

497.8 

506.4 

514.9 

523.5 

532.1 

71 

70.5 

0.739 

8.10 

0.40 

0.953 

480.8 

489.4 

498.0 

506.5 

515.1 

523.7 

532.3 

70 

69.0 

0.704 

7.71 

0.79 

0.907 

481.0 

489.6 

498.2 

506.7 

515.3 

523.9 

532.5 

69 

67.5 

0.670 

7.35 

1.15 

0.865 

481.2 

489.8 

498.4 

506.9 

515.5 

524.1 

532.7 

68 

66.0 

0.638 

7.00 

1.50 

0.824 

481.4 

490.0 

498.5 

507.1 

515.7 

524.3 

532.9 

67 

64.5 

0.607 

6.66 

1.84 

0.784 

481.6 

490.2 

498.7 

507.3 

515.9 

524.5 

533.1 

66 

63.0 

0.578 

6.33 

2.17 

0.745 

481.7 

490.3 

498.8 

507.4 

516.1 

524.7 

533.3 

65 

61.5 

0.550 

6.03 

2.47 

0.710 

481.8 

490.4 

499.0 

507.6 

516.2 

524.8 

533.4 

64 

60.0 

0.523 

5.73 

2.77 

0.674 

482.0 

490.6 

499.2 

507.8 

516.4 

525.0 

533.6 

63 

58.5 

0.498 

5.45 

3.05 

0.641 

482.1 

490.7 

499.3 

507.9 

516.5 

525.1 

533.7 

62 

57.0 

0.473 

5.18 

3.32 

0.610 

482.3 

490.9 

499.5 

508.1 

516.7 

525.3 

533.9 

61 

55.5 

0.450 

4.93 

3.57 

0.580 

482.5 

491.1 

499.7 

508.3 

516.9 

525.5 

534.1 

60 

54.0 

0.428 

4.68 

3.82 

0.551 

482.6 

491.2 

499.8 

508.4 

517.0 

525.6 

534.2 

59 

52.5 

0.407 

4.45 

4.05 

0.523 

482.8 

491.4 

500.0 

508.6 

517.2 

525.8 

534.4 

B 


124 


PSYCHROMETRICAL    TABLES. 


21 


Reading 
of  Ther- 

Temp. 

Force 

Weight 
of  Vapor 

Hu- 

Weight in  Grains  of  a  Cubic  Foot  of  Air. 

mometer, 
Fahr. 

of 
Dew- 

of 
Vapor 
in 

Ina 

Cubic 

.tteqa. 
for 
Sat'n. 

midity, 
atura- 

;„„ 

Height  of  the  Barometer  in  English  Inches. 

Point, 
Fahr. 

English 
Inches. 

Foot  of 
Air. 

DfaCu- 
bic  Ft. 
f  Air. 

ion  — 

1.000. 

in. 

2S.O 

in. 

28.5 

in. 

29.O 

in. 

29.5 

in. 

3O.O 

in. 

3O.5 

in. 

31.0 

Dry. 

Wet. 

o 

o 

in. 

gr. 

gr. 

gr- 

gr. 

gr- 

gr. 

gr. 

gr. 

gr. 

72 

59 

52.5 

0.407 

4.45 

4.05 

0.523 

482.8 

491.4 

500.0 

508.6 

517.2 

525.8 

534.4 

58 

51.0 

0.386 

4.23 

4.27 

0.498 

482.9 

491.5 

500.1 

508.7 

517.3 

525.9 

534.5 

57 

49.5 

0.367 

4.02 

4.48 

0.473 

483.0 

491.6 

500.2 

508.8 

517.4 

526.0 

534.6 

56 

48.0 

0.349 

3.82 

4.68 

0.449 

483.1 

491.7 

500.3 

508.9 

517.5 

526.1 

534.7 

55 

46.5 

0.331 

3.63 

4.87 

0.427 

483.2 

491.8 

500.4 

509.0 

517.6 

526.2 

534.8 

54 

45.0 

0.315 

3.45 

5.05 

0.406 

483.3 

491.9 

500.5 

509.1 

517.7 

526.2 

534.9 

53 

43.5 

0.299 

3.28 

5.22 

0.386 

483.3 

492.0 

500.6 

509.2 

517.8 

526.3 

535.0 

52 

42.0 

0.283 

3.11 

5.39 

0.366 

483.5 

492.1 

500.7 

509.3 

517.9 

526.4 

535,1 

51 

40.5 

0.269 

2.95 

5.55 

0.347 

483.6 

492.2 

500.8 

509.4 

518.0 

526.5 

535.2 

50 

39.0 

0.255 

2.80 

5.70 

0.329 

483.7 

492.3 

500.9 

509.5 

518.1 

526.6 

535.3 

49 

37.5 

0.242 

2.66 

5.84 

0.313 

483.8 

492.4 

501.0 

509.6 

518.2 

526.7 

535.4 

48 

36.0 

0.230 

2.52 

5.98 

0.296 

483.8 

492.4 

501.0 

509.6 

518.2 

526.7 

535.4 

47 

34.5 

0.218 

2.39 

6.11 

0.281 

483.9 

492.5 

501.2 

509.7 

518.3 

526.8 

535.5 

46 

33.0 

0.207 

2.27 

6.23 

0.267 

484.0 

492.6 

501.3 

509.8 

518.4 

526.9 

535.6 

45 

31.5 

0.196 

2.16 

6.34 

0.254 

484.1 

492.7 

501.3 

509.9 

518.5 

527.1 

535.7 

73 

73 

73.0 

0.801 

8.76 

0.00 

1.000 

479.6 

488.1 

496.7 

505.2 

513.8 

522.3 

530.9 

72 

71.5 

0.736 

8.35 

0.41 

0.953 

479.8 

488.3 

496.9 

505.4 

514.0 

522.5 

531.1 

71 

70.0 

0.727 

7.95 

0.81 

0.908 

480.0 

488.5 

497.1 

505.6 

514.2 

522.7 

531.3 

70 

68.5 

0.692 

7.57 

1.19 

0.864 

480.2 

488.7 

497.3 

505.8 

514.4 

522.9 

531.5 

69 

67.0 

0.659 

7.21 

1.55 

0.823 

480.4 

488.9 

497.5 

506.0 

514.6 

523.1 

531.7 

68 

65.5 

0.628 

6.87 

1.89 

0.784 

480.5 

489.0 

497.6 

506.1 

514.8 

523.3 

531.9 

67 

64.0 

0.597 

6.53 

2.23 

0.745 

480.7 

489.2 

497.8 

506.3 

515.0 

523.5 

532.1 

66 

62.5 

0.568 

6.22 

2.54 

0.710 

480.8 

489.3 

497.9 

506.4 

515.1 

523.6 

532.2 

65 

61.0 

0.541 

5.92 

2.84 

0.676 

481.0 

489.5 

498.1 

506.6 

515.3 

523.8 

532.4 

64 

59.5 

0.515 

5.63 

3.13 

0.643 

481.1 

489.6 

498.2 

506.8 

515.4 

524.0 

532.6 

63 

58.0 

0.489 

5.34 

3.42 

0.610 

481.2 

489.8 

498.4 

507.0 

515.6 

524.2 

532.8 

62 

56.5 

0.465 

5.09 

3.67 

0.581 

481.4 

490.0 

498.6 

507.2 

515.8 

524.4 

533.0 

61 

55.0 

0.442 

4.84 

3.92 

0.553 

481.6 

490.2 

498.8 

507.4 

516.0 

524.6 

533.2 

60 

53.5 

0.421 

4.59 

4.17 

0.524 

481.7 

490.3 

498.9 

507.5 

516.1 

524.7 

533.3 

59 

52.0 

0.400 

4.37 

4.39 

0.499 

481.8 

490.4 

499.0 

507.6 

516.2 

524.8 

533.4 

58 

50.5 

0.380 

4.16 

4.60 

0.475 

482.0 

490.6 

499.2 

507.8 

516.4 

525.0 

533.6 

57 

49.0 

0.361 

3.94 

4.82 

0.450 

482.1 

490.7 

499.3 

507.9 

516.5 

525.1 

533.7 

56 

47.5 

0.343 

3.74 

5.02 

0.427 

.482.2 

490.8 

499.4 

508.0 

516.6 

525.2 

533.8 

55 

46.0 

0.326 

3.56 

5.20 

0.406 

482.3 

490.9 

499.5 

508.1 

516.7 

525.3 

533.9 

54 

44.5 

0.309 

3.38 

5.38 

0.386 

482.4 

491.0 

499.6 

508.2 

516.8 

525.4 

534.0 

53 

43.0 

0.293 

3.21 

5.55 

0.366 

482.5 

491.1 

499.7 

508.3 

516.9 

525.5 

534.1 

52 

41.5 

0.279 

3.05 

5.71 

0.348 

482.6 

491.2 

499.8 

508.4 

517.0 

525.6 

534.2 

51 

40.0 

0.264 

2.89 

5.87 

0.330 

482.7 

491.3 

499.9 

508.5 

517.1 

525.7 

534.3 

50 

38.5 

0.251 

2.74 

6.02 

0.313 

482.8 

491.4 

500.0 

508.6 

517.2 

525.8 

534.4 

49 

37.0 

0.238 

2.60 

6.16 

0.297 

482.9 

491.5 

500.0 

508.6 

517.2 

525.8 

534.4 

48 

35.5 

0.226 

2.47 

6.29 

0.282 

483.0 

491.6 

500.1 

508.7 

517.3 

525.9 

534.5 

47 

34.0 

0.214 

2.34 

6.42 

0.267 

483.1 

491.7 

500.2 

508.8 

517.4 

526.0 

534.6 

46 

32.5 

0.203 

2.22 

6.54 

0.253 

433.3 

491.9 

500.4 

509.1 

517.6 

526.2 

534.8 

B 


125 


22 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

Wet. 

in. 

28.0 

in. 
28.5 

in. 

29.0 

in. 

29.5 

in. 
30.0 

in. 

30.5 

in. 

31.O 

o 

0 

o 

in. 

gr- 

gr. 

gr. 

gr. 

gr. 

gr. 

gr. 

gr. 

gr. 

74 

74 

74.0 

0.827 

9.04 

0.00 

1.000 

478.4 

486.9 

495.5 

504.0 

512.6 

521.1 

529.7 

73 

72.5 

0.787 

8.60 

0.44 

0.951 

478.6 

487.1 

495.7 

504.2 

512.8 

521.3 

529.9 

72 

71.0 

0.751 

8.20 

0.84 

0.907 

478.8 

487.3 

495.9 

504.4 

513.0 

521.5 

530.1 

71 

69.5 

0.715 

7.81 

1.23 

0.864 

479.0 

487.5 

496.1 

504.6 

513.2 

521.7 

530.3 

70 

68.0 

0.681 

7.44 

1.60 

0.823 

479.2 

487.7 

496.3 

504.8 

513.4 

521.9 

530.5 

69 

66.5 

0.648 

7.08 

1.96 

0.783 

479.4 

487.9 

496.5 

505.0 

513.6 

522.1 

530.7 

68 

65.0 

0.617 

6.75 

2.29 

0.747 

479.6 

4S8.1 

496.7 

505.2 

513.8 

522.3 

530.9 

67 

63.5 

0.588 

6.41 

2.63 

0.709 

479.8 

488.3 

496.9 

505.4 

514.0 

522.5 

531.1 

66 

62.0 

0.559 

6.10 

2.94 

0.675 

480.0 

488.5 

497.1 

505.6 

514.2 

522.7 

531.3 

65 

60.5 

0.532 

5.81 

3.23 

0.643 

480.1 

488.7 

497.3 

505.9 

514.4 

522.9 

531.5 

64 

59.0 

0.506 

5.52 

3.52 

0.611 

480.3 

488.9 

497.5 

506.1 

514.6 

523.2 

531.8 

63 

57.5 

0.481 

5.24 

3.80 

0.580 

480.5 

489.1 

497.7 

506.3 

514.8 

523.4 

532.0 

62 

56.0 

0.458 

4.99 

4.05 

0.552 

480.6 

489.2 

497.8 

506.4 

514.9 

523.5 

532.1 

61 

54.5 

0.435 

4.75 

4.29 

0.525 

480.7 

489.3 

497.9 

506.5 

515.0 

523.6 

532.2 

60 

53.0 

0.414 

4.52 

4.52 

0.500 

480.9 

489.5 

498.1 

506.7 

515.2 

523.8 

532.4 

59 

51.5 

0.393 

4.29 

4.75 

0.475 

481.0 

489.6 

498.2 

506.8 

515.3 

523.9 

532.5 

58 

50.0 

0.373 

4.08 

4.96 

0.451 

481.1 

489.7 

498.3 

506.9 

515.4 

524.0 

532.6 

57 

48.5 

0.355 

3.86 

5.18 

0.427 

481.2 

489.8 

498.4 

507.0 

515.5 

524.1 

532.7 

56 

47.0 

0.337 

3.66 

5.38 

0.405 

481.3 

489.9 

498.5 

507.1 

515.6 

524.2 

532.8 

55 

45.5 

0.320 

3.48 

5.56 

0.385 

481.4 

490.0 

498.6 

507.2 

515.7 

524.3 

532.9 

54 

44.0 

0.304 

3.32 

5.72 

0.367 

481.5 

490.1 

498.7 

507.3 

515.8 

524.4 

533.0 

53 

42.5 

0.288 

3.15 

5.89 

0.348 

481.6 

490.2 

498.8 

507.4 

515.9 

524.5 

533.1 

52 

41.0 

0.274 

2.99 

6.05 

0.331 

481.7 

490.3 

498.9 

507.5 

516.0 

524.6 

533.2 

51 

39.5 

0.260 

2.83 

6.21 

0.313 

481.8 

490.4 

499.0 

507.6 

516.1 

524.7 

533.3 

50 

38.0 

0.246 

2.69 

6.35 

0.298 

481.9 

490.5 

499.1 

507.7 

516.2 

524.8 

533.4 

49 

36.5 

0.234 

2.55 

6.49 

0.282 

481.9 

490.5 

499.1 

507.7 

516.2 

524.8 

533.4 

48 

35.0 

0.222 

2.42 

6.62 

0.268 

482.0 

490.6 

499.2 

507.8 

516.3 

524.9 

533.5 

47 

33.5 

0.210 

2.30 

6.74 

0.254 

482.1 

490.7 

499.2 

507.9 

516.4 

525.0 

533.6 

75 

75 

75.0 

0.854 

9.31 

0.00 

1.000 

477.4 

485.9 

494.4 

502.9 

511.5 

520.0 

528.5 

74 

73.5 

0.814 

8.87 

0.44 

0.953 

477.6 

486.1 

494.6 

503.1 

511.7 

520.2 

528.7 

73 

72.0 

0.776 

8.45 

0.86 

0.908 

477.8 

486.3 

494.8 

503.3 

511.9 

520.4 

528.9 

72 

70.5 

0.739 

8.05 

1.26 

0.865 

478.0 

486.5 

495.0 

503.5 

512.1 

520.6 

529.1 

71 

69.0 

0.704 

7.67 

1.64 

0.824 

478.2 

486.7 

495.2 

503.7 

512.3 

520.8 

529.3 

70 

67.5 

0.670 

7.30 

2.01 

0.784 

478.3 

486.8 

495.3 

503.8 

512.5 

521.0 

529.5 

69 

66.0 

0.638 

6.95 

2.36 

0.746 

478.5 

487.0 

495.5 

504.0 

512.7 

521.2 

529.7 

68 

64.5 

0.607 

6.62 

2.69 

0.711 

478.7 

487.2 

495.7 

504.2 

512.9 

521.4 

529.9 

67 

63.0 

0.578 

6.30 

3.01 

0.677 

478.9 

487.4 

495.9 

504.4 

513.1 

521.6 

530.1 

66 

61.5 

0.550' 

5.99 

3.32 

0.643 

479.1 

487.6 

496.1 

504.6 

513.3 

521.8 

530.3 

65 

60.0 

0.523 

5.69 

3.62 

0.611 

479.3 

487.8 

496.4 

504.9 

513.5 

522.0 

530.6 

64 

58.5 

0.498 

5.42 

3.89 

0.582 

479.5 

488.0 

496.6 

505.1 

513.7 

522.2 

530.8 

63 

57.0 

0.473 

5.15 

4.16 

0.553 

479.6 

488.1 

496.7 

505.2 

513.8 

522.3 

530.9 

62 

55.5 

0.450 

4.90 

4.41 

0.526 

479.7 

484.2 

496.8 

505.3 

513.9 

522.4 

531.0 

—      -~ 

B 


126 


PSYCHROMETRICAL    TABLES. 


23 


1 

Reading 
of  Ther- 
mometer, 
Fahr.. 

'emp. 
of 
Dew- 
•oint, 
Fahr. 

Force 
of 
Vapor 
in 
English 
[nches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
Foot  of 
Air. 

ivequ. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

in. 

28.0 

in. 
28.5 

in. 

29.0 

29.5 

in. 

30.0 

in. 

30.5 

in. 

31.0 

Dry. 

Wet. 

o 

0 

0 

in. 

gr. 

gr- 

gr. 

gr. 

gr. 

gr. 

gr. 

gr. 

gr- 

75 

62 

55.5 

0.450 

4.90 

4.41 

0.526 

479.7 

488.2 

496.8 

505.3 

513.9 

522.4 

531.0 

61 

54.0 

0.428 

4.66 

4.65 

0.501 

479.9 

488.4 

497.0 

505.5 

514.1 

522.6 

531.2 

60 

52.5 

0.407 

4.43 

4.88 

0.476 

480.0 

488.5 

497.1 

505.6 

514.2 

522.7 

531.3 

59 

51.0 

0.386 

4.21 

5.10 

0.452 

480.1 

488.6 

497.2 

505.7 

514.3 

522.8 

531.4 

58 

49.5 

0.367 

4.00 

5.31 

0.429 

480.3 

488.8 

497.4 

505.9 

514.5 

523.0 

531.6 

57 

48.0 

0.349 

3.79 

5.52 

0.407 

480.4 

488.9 

497.5 

506.0 

514.6 

523.1 

531.7 

56 

46.5 

0.331 

3.60 

5.71 

0.387 

480.5 

489.0 

497.6 

506.1 

514.7 

523.2 

531.8 

55 

45.0 

0.315 

3.42 

5.89 

0.367 

480.6 

489.1 

497.7 

506.2 

514.8 

523.3 

531.9 

54 

43.5 

0.299 

3.25 

6.06 

0.349 

480.7 

489.2 

497.8 

506.3 

514.9 

523.4 

532.0 

53 

42.0 

0.283 

3.09 

6.22 

0.332 

480.8 

489.3 

497.9 

506.4 

515.0 

523.5 

532.1 

52 

40.5 

0.269 

2.93 

6.38 

0.315 

480.8 

489.3 

497.9 

506.4 

515.0 

523.5 

532.1 

51 

39.0 

0.255 

2.78 

6.53 

0.299 

480.9 

489.4 

498.0 

506.5 

515.1 

523.6 

532.2 

50 

37.5 

0.242 

2.64 

6.67 

0.284 

481.0 

489.5 

498.1 

506.6 

515.2 

523.7 

532.3 

49 

36.0 

0.230 

2.51 

6.80 

0.270 

481.1 

489.6 

498.2 

506.7 

515.3 

523.8 

532.4 

48 

34.5 

0.218 

2.39 

6.92 

0.257 

481.2 

489.7 

498.3 

506.8 

515.4 

523.9 

532.5 

76 

76 

76.0 

0.882 

9.60 

0.00 

1.000 

476.3 

484.8 

493.3 

501.8 

510.3 

518.8 

527.3 

75 

74.5 

0.840 

9.14 

0.46 

0.952 

476.6 

485.1 

493.6 

502.1 

510.6 

519.1 

527.6 

74 

73.0 

0.801 

8.71 

0.89 

0.907 

476.8 

485.3 

493.8 

502.3 

510.8 

519.3 

527.8 

73 

71.5 

0.763 

8.30 

1.30 

0.865 

477.0 

485.5 

494.0 

502.6 

511.1 

519.6 

528.1 

72 

70.0 

0.727 

7.90 

1.70 

0.823 

477.2 

485.7 

494.3 

502.8 

511.3 

519.8 

528.3 

71 

68.5 

0.692 

7.53 

2.07 

0.784 

477.4 

485.9 

494.5 

503.0 

511.5 

520.0 

528.5 

70 

67.0 

0.659 

7.17 

2.43 

0.747 

477.6 

486.1 

494.7 

503.2 

511.7 

520.2 

528.7 

69 

65.5 

0.628 

6.83 

2.77 

0.711 

477.8 

486.3 

494.9 

503.4 

511.9 

520.4 

528.9 

68 

64.0 

0.597 

6.49 

3.11 

0.676 

477.9 

486.4 

495.0 

503.6 

512.1 

520.6 

529.2 

67 

62.5 

0.568 

6.16 

3.44 

0.642 

478.1 

486.6 

465.2 

503.8 

512.3 

520.8 

529.4 

66 

61.0 

0.541 

5.88 

3.72 

0.613 

478.2 

486.7 

495.3 

503.9 

512.4 

520.9 

529.5 

65 

59.5 

0.515 

5.59 

4.01 

0.582 

478.3 

486.8 

495.4 

504.0 

512.5 

521.0 

529.6 

64 

58.0 

0.489 

5.31 

4.29 

0.553 

478.5 

487.0 

495.6 

504.2 

512.7 

521.2 

529.8 

63 

56.5 

0.465 

5.06 

4.54 

0.527 

478.6 

487.1 

495.7 

504.3 

512.8 

521.3 

529.9 

62 

55.0 

0.442 

4.81 

4.79 

0.501 

478.8 

487.3 

495.9 

504.5 

513.0 

521.5 

530.1 

61 

53.5 

0.421 

4.57 

5.03 

0'.476 

479.0 

487.5 

496.1 

504.7 

513.2 

521.7 

530.3 

60 

52.0 

0.400 

4.34 

5.26 

0.452 

479.1 

487.6 

496.2 

504.8 

513.3 

521.8 

530.4 

59 

50.5 

0.380 

4.13 

5.47 

0.430 

499.2 

487.7 

496.3 

504.9 

513.4 

521.9 

530.5 

58 

49.0 

0.361 

3.92 

5.68 

0.408 

499.3 

487.8 

496.4 

505.0 

513.5 

522.0 

530.6 

57 

47.5 

0.343 

3.73 

5.87 

0.389 

499.4 

487.9 

496.5 

505.1 

513.6 

522.1 

530.7 

56 

46.0 

0.326 

3.54 

6.06 

0.369 

499.5 

488.0 

496.6 

505.2 

513.7 

522.2 

530.8 

55 

44.5 

0.309 

3.36 

6.24 

0.351 

499.6 

488.1 

496.7 

505.3 

513.8 

522.3 

530.9 

54 

43.0 

0.293 

3.19 

6.41 

0.332 

499.7 

488.2 

496.8 

505.4 

513.9 

522.4 

531.0 

53 

41.5 

0.279 

3.03 

6.57 

0.316 

499.8 

488.3 

496.9 

505.5 

514.0 

522.5 

531.1 

52 

40.0 

0.264 

2.88 

6.72 

0.301 

499.9 

488.4 

497.0 

505.6 

514.1 

522.6 

531.2 

51 

38.5 

0.251 

2.73 

6.87 

0.284 

500.0 

488.5 

497.1 

505.7 

514.2 

522.7 

531.3 

50 

37.0 

0.238 

2.59 

7.01 

0.269 

500.1 

488.6 

497.2 

505.8 

514.3 

522.8 

531.4 

49 

35.5 

0.226 

2.46 

7.14 

0.256 

500.2 

488.7 

497.3 

505.9 

514.4 

522.9 

531.5 

B 


127 


24 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

in. 

28.O 

in. 
28.5 

in. 
29.0 

in. 

29.5 

in. 

3O.O 

in. 

30.5 

in. 

31.0 

Dry. 

Wet. 

o 

o 

o 

in. 

g*. 

gr. 

gr. 

gr. 

gr. 

gr- 

gr- 

gr. 

gr- 

77 

77 

77.0 

0.910 

9.89 

0.00 

1.000 

475.3 

483.8 

492.3 

500.8 

509.2 

517.7 

526.2 

76 

75.5 

0.868 

9.42 

0.47 

0.953 

475.5 

484.0 

492.5 

501.0 

509.4 

517.9 

526.4 

75 

74.0 

0.827 

8.99 

0.90 

0.909 

475.7 

484.2 

492.7 

501.2 

509.6 

518.1 

526.6 

74 

72.5 

0.787 

8.57 

1.32 

0.867 

475.9 

484.4 

492.9 

501.4 

509.9 

518.4 

526.9 

73 

71.0 

0.751 

8.15 

1.74 

0.824 

476.1 

484.6 

493.1 

501.6 

510.1 

518.6 

527.1 

72 

69.5 

0.715 

7.7.7 

2.12 

0.786 

476.3 

484.8 

493.3 

501.8 

510.3 

518.8 

527.3 

71 

68.0 

0.681 

7.40 

2.49 

0.748 

476.5 

485.0 

493.5 

502.0 

510.5 

519.0 

527.5 

70 

66.5 

0.648 

7.04 

2.85 

0.712 

476.7 

485.2 

493.7 

502.2 

510.7 

519.2 

527.7 

69 

65.0 

0.617 

6.71 

3.18 

0.678 

476.9 

485.4 

493.9 

502.4 

510.9 

519.4 

527.9 

68 

63.5 

0.588 

6.37 

3.52 

0.644 

477.0 

485.6 

494.1 

502.6 

511.1 

519.6 

528.1 

67 

62.0 

0.559 

6.06 

3.83 

0.613 

477.2 

485.8 

494.3 

502.8 

511.3 

519.8 

528.3 

66 

60.5 

0.532 

5.77 

4.12 

0.583 

477.4 

486.0 

494.5 

503.0 

511.5 

520.0 

528.5 

65 

59.0 

0.506 

5.49 

4.40. 

0.556 

477.5 

486.1 

494.6 

503.1 

511.6 

520.1 

528.6 

64 

57.5 

0.481 

5.21 

4.68 

0.527 

477.7 

486.3 

494.8 

503.3 

511.8 

520.3 

528.8 

63 

56.0 

0.458 

4.96 

4.93 

0.501 

477.9 

486.5 

495.0 

503.5 

512.0 

520.5 

529.0 

62 

54.5 

0.435 

4.70 

5.19 

0.476 

478.0 

486.6 

495.1 

503.7 

512.1 

520.6 

529.1 

61 

53.0 

0.414 

4.49 

5.40 

0.454 

478.0 

486.6 

495.1 

503.7 

512.2 

520.7 

529.3 

60 

51.5 

0.393 

4.26 

5.63 

0.431 

478.1 

486.7 

495.2 

503.8 

512.3 

520.8 

529.4 

59 

50.0 

0.373 

4.05 

5.84 

0.410 

478.2 

486.8 

495.3 

503.9 

512.4 

520.9 

529.5 

58 

48.5 

0.355 

3.85 

6.04 

0.389 

478.3 

486.9 

495.4 

504.0 

512.5 

521.0 

529.6 

57 

47.0 

0.337 

3.65 

6.24 

0.369 

478.5 

487.1 

495.6 

504.1 

512.7 

521.2 

529.8 

56 

45.5 

0.320 

3.47 

6.42 

0.351 

478.6 

487.2 

495.7 

504.2 

512.8 

521.3 

529.9 

55 

44.0 

0.304 

3.29 

6.60 

0.333 

478.7 

487.3 

495.8 

504.3 

512.9 

521.4 

530.0 

54 

42.5 

0.288 

3.13 

6.76 

0.317 

478.8 

487.4 

495.9 

504.4 

513.0 

521.5 

530.1 

53 

41.0 

0.274 

2.97 

6.92 

0.301 

478.9 

487.5 

496.0 

504.5 

513.1 

521.6 

530.2 

52 

39.5 

0.260 

2.82 

7.07 

0.285 

479.0 

487.6 

496.1 

504.6 

513.2 

521.7 

530.3 

51 

38.0 

0.246 

2.67 

7.22 

0.270 

479.1 

487.7 

496.2 

504.7 

513.3 

521.8 

530.4 

50 

36.5 

0.234 

2.53 

7.36 

0.256 

479.1 

487,7 

496.2 

504.7 

513.3 

521.8 

530.4 

78 

78 

78.0 

0.940 

10.19 

0.00 

,  1.000 

474.1 

482.5 

491.0 

499.4 

508.0 

516.4 

524.9 

77 

76.5 

0.896 

9.72 

0.47 

0.954 

474.4 

482.9 

491.4 

499.9 

508.3 

516.7 

525.2 

76 

75.0 

0.854 

9.25 

0.94 

0.908 

474.7 

483.2 

491.6 

500.1 

508.6 

517.1 

525.6 

75 

73.5 

0.814 

8.82 

1.37 

0.865 

474.9 

483.4 

491.8 

500.3 

508.8 

517.3 

525.8 

74 

72.0 

0.776 

8.40 

1.79 

0.824 

475.2 

483.7 

492.1 

500.6 

509.1 

517.6 

526.1 

73 

70,5 

0.739 

8.00 

2.19 

0.785 

475.4 

483.9 

492.3 

500.8 

500.3 

517.8 

526.3 

72 

69.0 

0.704 

7.62 

2.57 

0.748 

475.6 

484.1 

492.5 

501,0 

509.5 

518.0 

526.5 

71 

67.5 

0.670 

7.25 

2.94 

0.711 

475.8 

484.3 

492.7 

501.2 

509.7 

518.2 

526.7 

70 

66.0 

0.638 

6.91 

3.28 

0.678 

475.9 

484.4 

492.9 

501.4 

509.9 

518.4 

526.9 

69 

64.5 

0.607 

6.58 

3.61 

0.646 

476.1 

484.6 

493.1 

501.6 

510.1 

518.6 

527.1 

68 

63.0 

0.578 

6.26 

3.93 

0.614 

476.3 

484.8 

493.3 

501.8 

510.3 

518.8 

527.3 

67 

61.5 

0.550 

5.96 

4.23 

0.585 

476.4 

484.9 

493.4 

501.9 

510.4 

518.9 

527.4 

66 

60.0 

0.523 

5.66 

4.53 

0.555 

476.6 

485.1 

493.6 

502.1 

510.6 

519.1 

527.6 

65 

58.5 

0.498 

5.38 

4.81 

0.528 

476.8 

485.3 

493.8 

502.3 

510.8 

519.3 

527.8 

B 


128 


PSYCHROMETRICAL    TABLES. 


25 


Reading 

Force 

Weight 
of  Vapor 

Hu- 

Weight in  Grains  of  a  Cubic  Foot  of  Air. 

mometer, 
Fakr. 

of 
Dew- 

of 
Vapor 

In  a 

Reqd. 
for 

midity, 
Satura- 

Height  of  the  Barometer  in  English  Inches. 

Point 

in 

Cubic    sat  n. 

A-                     

Fahr.' 

English 

Iiich.es. 

Foot  of  of  aCu- 
Air.     ihin  T?f. 

i.oooT 

in. 

in. 

in. 

in. 

in. 

in. 

in. 

Dry. 

Wet. 

of  Air. 

28.0 

28.5 

29.0 

29.5 

30.0 

30.5 

31.0 

o 

0 

o 

in. 

gr. 

gr. 

gr- 

gr. 

gr- 

gr- 

gr. 

gr- 

gr. 

78 

65 

58.5 

0.498 

5.38 

4.81 

0.528 

476.8 

485.3 

493.8 

502.3 

510.8 

519.3 

527.8 

64 

57.0 

0.473 

5.12 

5.07 

0.502 

476.8 

485.3 

493.9 

502.4 

510.9 

519.4 

527.9 

63 

55.5 

0.450 

4.88 

5.31 

0.479 

476.9 

485.4 

494.0 

502.5 

511.0 

519.5 

528.0 

62 

54.0 

0.428 

4.63 

5.56 

0.454 

477.1 

485.6 

494.2 

502.7 

511.2 

519.7 

528.2 

61 

52.5 

0.407 

4.40 

5.79 

0.432 

477.2 

485.7 

494.3 

502.8 

511.3 

519.8 

528.3 

60 

51.0 

0.386 

4.18 

6.01 

0.409 

477.3 

485.8 

494.4 

502.9 

511.4 

519.9 

528.4 

59 

49.5 

0.367 

3.98 

6.21 

0.391 

477.4 

485.9 

494.5 

503.0 

511.5 

520.0 

528.5 

58 

48.0 

0.349 

3.78 

6.41 

0.371 

477.5 

486.0 

494.6 

503.1 

511.6 

520.1 

528.6 

57 

46.5 

0.331 

3.59 

6.60 

0.352 

477.6 

486.1 

494.7 

503.2 

511.7 

520.2 

528.7 

56 

45.0 

0.315 

3.41 

6.78 

0.335 

477.8 

486.3 

494.8 

503.3 

511.9 

520.4 

528.9 

55 

43.5 

0.299 

3.24 

6.95 

0.318 

477.9 

486.4 

494.9 

503.4 

512.0 

520.5 

529.0 

54 

42.0 

0.283 

3.07 

7.12 

0.301 

478.0 

486.5 

495.0 

503.5 

512.1 

520.6 

529.1 

53 

40.5 

0.269 

2.92 

7.27 

0.287 

478.1 

486.5 

495.0 

503.5 

512.1 

520.6 

529.1 

52 

39.0 

0.255 

2.77 

7.42 

0.272 

478.2 

486.6 

495.1 

503.6 

512.2 

520.7 

529.2 

51 

37.5 

0.242 

2.63 

7.56 

0.258 

478.3 

486.7 

495.2 

503.7 

512.3 

520.8 

529.3 

79 

79 

79.0 

0.970 

10.50 

0.00 

1.000 

47S.1 

481.5 

490.0 

498.4 

506.9 

515.3 

523.8 

78 

77.5 

0.925 

10.01 

0.49 

0.953 

473.4 

481.8 

490.3 

498.7 

507.2 

515.6 

524.1 

77 

76.0 

0.882 

9.54 

0.96 

0.909 

473.7 

482.1 

490.6 

499.0 

507.5 

515.9 

524.4 

76 

74.5 

0.840 

9.10 

1.40 

0.867 

473.8 

482.2 

490.7 

499.2 

507.7 

516.2 

524.7 

75 

73.0 

0.801 

8.66 

1.84 

0.825 

474.0 

482.4 

490.9 

499.4 

507.9 

516.4 

524.9 

74 

71.5 

0.763 

8.25 

2.25 

0.786 

474.3 

482.7 

491.2 

499.7 

508.2 

516.7 

525.2 

73 

70.0 

0.727 

7.86 

2.64 

0.749 

474.5 

482.9 

491.4 

499.9 

508.4 

516.9 

525.4 

72 

68.5 

0.692 

7.48 

3.02 

0.712 

471.7 

483.1 

491.6 

500.1 

508.6 

517.1 

525.6 

71 

67.0 

0.659 

7.12 

3.38 

0.678 

474.9 

483.4 

491.9 

500.4 

508.8 

517.3 

525.8 

70 

65.5 

0.628 

6.79 

3.71 

0.647 

475.1 

483.6 

462.1 

500.6 

509.0 

517.5 

526.0 

69 

64.0 

0.597 

6.45 

4.05 

0.614 

475.3 

483.8 

492.3 

500.8 

509.2 

517.7 

526.2 

68 

62.5 

0.568 

6.14 

4.36 

0.585 

475.4 

483.9 

492.4 

500.9 

509.3 

517.8 

526.3 

67 

61.0 

0.541 

5.84 

4.66 

0.556 

4T5.6 

484.1 

492.6 

501.1 

509.5 

518.0 

526.5 

66 

59.5 

0.515 

5.55 

4.95 

0.529 

475.7 

484.2 

492.7 

501.2 

509.6 

518.1 

526.6 

65 

58.0 

0.489 

5.28 

5.22 

0.503 

475.8 

484.3 

492.8 

501.3 

509.8 

518.3 

526.8 

64 

56.5 

0.465 

5.02 

5.48 

0.478 

476.0 

484.5 

493.0 

501.5 

510.0 

518.5 

527.0 

63 

55.0 

0.442 

4.78 

5.72 

0.455 

476.1 

484.6 

493.1 

501.6 

510.1 

518.6 

527.1 

62 

53.5 

0.421 

4.54 

5.96 

0.432 

476.3 

484.8 

493.3 

501.8 

510.3 

518.8 

527.3 

61 

52.0 

0.400 

4.31 

6.19 

0.410 

476.4 

484.9 

493.4 

501.9 

•510.4 

518.9 

527.4 

60 

50.5 

0.380 

4.10 

6.40 

0.390 

476.5 

485.0 

493.5 

502.0 

510.5 

519.0 

527.5 

59 

49.0 

0.361 

3.90 

6.60 

0.371 

476.6 

485.1 

493.6 

502.1 

510.6 

519.1 

527.6 

58 

47.5 

0.343 

3.71 

6.79 

0.353 

476.7 

485.2 

493.7 

502.2 

510.7 

519.2 

527.7 

57 

46.0 

0.326 

3.52 

6.98 

0.335 

476.8 

485.3 

493.8 

502.3 

510.8 

519.3 

527.8 

56 

44.5 

0.309 

3.34 

7.16 

0.318 

476.9 

485.4 

493.9 

502.4 

510.9 

519.4 

527.9 

55 

43.0 

0.293 

3.17 

7.33 

0.301 

477.0 

485.5 

494.0 

502.5 

511.0 

519.5 

528.0 

54 

41.5 

0.279 

3.01 

7.49 

0.287 

477.1 

485.6 

494.1 

502.6 

511.1 

519.6 

528.1 

53 

40.0 

0.264 

2.86 

7.64 

0.272 

477.2 

485.7 

494.2 

502.7 

511.2 

519.7 

528.2 

52 

3S.5 

0.251 

2.72 

7.78 

0.260 

477.3 

485.8 

494.3 

502.8 

511.3 

519.8 

528.3 

B 


129 


26 


PSYCHROMETRICAL    TABLES. 


Heading 
of  Ther- 

Temp. 

Force 

Weight 
of  Vapor 

Hu- 

Weight in  Grains  of  a  Cubic  Foot  of  Air. 

mometer, 
Fahr. 

of 
Dew- 
Point, 

of 
Vapor 
in 

In  a 
Cubic 

Reqd. 
for 

Sat'n. 

midity, 
Satura- 
tion — 

Height  of  the  Barometer  in  English  Inches. 

Fahr. 

English 
Inches. 

Foot  of 
Air. 

ofaCu- 
bic  Ft. 

1.000. 

in. 

in. 

in. 

in. 

in. 

in. 

in. 

Dry. 

Wet. 

of  Air. 

28.O 

28.5 

29.O 

29.5 

3O.O 

30.5 

31.O 

o 

o 

o 

in. 

gr. 

gr. 

gr- 

gr. 

gr. 

gr- 

gr. 

gr- 

gr 

80 

80 

80.0 

1.001 

10.81 

0.00 

1.000 

472.0 

480.4 

488.9 

497.3 

505.7 

514.1 

522.6 

79 

78.5 

0.955 

10.31 

0.50 

0.954 

472.3 

480.7 

489.1 

497.5 

506.0 

514.4 

522.9 

78 

77.0 

0.910 

9.83 

0.98 

0.909 

472.5 

480.9 

489.4 

497.9 

506.3 

514.7 

523.2 

77 

75.5 

0.868 

9.37 

1.44 

0.867 

472.7 

481.1 

489.6 

498.1 

506.5 

514.9 

523.4 

76 

74.0 

0.827 

8.93 

1.88 

0.826 

473.0 

481.4 

489.9 

498.4 

506.8 

515.2 

523.7 

75 

72.5 

0.787 

8.50 

2.31 

0.786 

473.2 

481.6 

490.1 

498.6 

507.0 

515.4 

523.9 

74 

71.0 

0.751 

8.11 

2.70 

0.750 

473.4 

481.8 

490.3 

498.8 

507.2 

515.6 

524.1 

73 

69.5 

0.715 

7.71 

3.10 

0.713 

473.6 

482.1 

490.6 

499.1 

507.5 

515.9 

524.4 

72 

68.0 

0.681 

7.35 

3.46 

0.680 

473.8 

482.3 

490.8 

499.3 

507.7 

516.1 

524.6 

71 

66.5 

0.648 

6.99 

3.82 

0.647 

474.0 

482.5 

491.0 

499.5 

507.9 

516.3 

524.8 

70 

65.0 

0.617 

6.66 

4.15 

0.616 

474.2 

482.7 

491.2 

499.7 

508.1 

516.5 

525.0 

69 

63.5 

0.588 

6.33 

4.48 

0.586 

474.4 

482.9 

491.4 

499.9 

508.3 

516.7 

525.2 

68 

62.0 

0.559 

6.03 

4.78 

0.558 

474.5 

483.0 

491.5 

500.0 

508.4 

516.8 

525.3 

67 

60.5 

0.532 

5.74 

5.07 

0.531 

474.7 

483.2 

491.7 

500.2 

508.6 

517.0 

525.5 

66 

59.0 

0.506 

5.45 

5.36 

0.504 

474.9 

483.4 

491.9 

500.4 

508.8 

517.2 

525.7 

65 

57.5 

0.481 

5.18 

5.63 

0.479 

475.0 

483.5 

492.0 

500.5 

508.9 

517.3 

525.8 

64 

56.0 

0.458 

4.93 

5.96 

0.456 

475.2 

483.7 

492.2 

500.7 

509.1 

517.5 

526.0 

63 

54.5 

0.435 

4.69 

6.12 

0.434 

475.3 

483.8 

492.3 

500.8 

509.2 

517.6 

526.1 

62 

53.0 

0.414 

4.46 

6.35 

0.413 

475.4 

483.9 

492.4 

500.9 

509.3 

517.7 

526.2 

61 

51.5 

0.393 

4.23 

6.58 

0.391 

475.5 

484.0 

492.5 

501.0 

509.4 

517.8 

526.3 

60 

50.0 

0.373 

4.02 

6.79 

0.372 

475.6 

484.1 

492.6 

501.1 

509.5 

517.9 

526.4 

59 

48.5 

0.355 

3.82 

6.99 

0.353 

475.7 

484.2 

492.7 

501.2 

509.6 

518.0 

526.5 

58 

47.0 

0.337 

3.63 

7.18 

0.336 

475.9 

484.4 

492.9 

501.4 

509.8 

518.2 

526.7 

57 

45.5 

0.320 

3.45 

7.36 

0.319 

476.0 

484.5 

493.1 

501.5 

509.9 

518.3 

526.8 

56 

44.0 

0.304 

3.27 

7.54 

0.302 

476.1 

484.6 

493.2 

501.6 

510.0 

518.4 

526.9 

55 

42.5 

0.288 

3.11 

7.70 

0.288 

476.2 

484.7 

493.3 

501.7 

510.1 

518.5 

527.0 

54 

41.0 

0.274 

2.96 

7.85 

0.274 

476.3 

484.8 

493.4 

501.8 

510.2 

518.6 

527.1 

53 

39.5 

0.260 

2.82 

7.99 

0.261 

476.3 

484.8 

493.4 

501.8 

510.2 

518.6 

527.1 

81 

81 

81.0 

1.034 

11.14 

0.00 

1.000 

471.0 

479.4 

487.8 

496.2 

504.6 

513.0 

521.4 

80 

79.5 

0.986 

10.62 

0.52 

0.953 

471.3 

479.7 

488.1 

496.5 

504.9 

513.3 

521.7 

79 

78.0 

0.940 

10.13 

1.01 

0.910 

471.5 

479.9 

488.4 

496.8 

505.2 

513.6 

522.1 

78 

76.5 

0.896 

9.65 

1.49 

0.866 

471.7 

480.1 

488.6 

497.0 

505.4 

513.8 

522.3 

77 

75.0 

0.854 

9.20 

1.94 

0.826 

472.0 

480.4 

488.9 

497.3 

505.7 

514.1 

522.6 

76 

73.5 

0.814 

8.77 

2.37 

0.787 

472.2 

480.6 

489.1 

497.5 

505.9 

514.3 

522.8 

75 

72.0 

0.776 

8.35 

2.79 

0.750 

472.5 

480.9 

489.4 

497.8 

506.2 

514.6 

523.1 

74 

70.5 

0.739 

7.95 

3.19 

0.713 

472.6 

481.0 

489.5 

497.9 

506.4 

514.8 

523.3 

73 

69.0 

0.704 

7.57 

3.57 

0.680 

472.8 

481.2 

489.7 

498.1 

506.6 

515.0 

523.5 

72 

67.5 

0.670 

7.21 

3.93 

0.647 

473.0 

481.4 

489.9 

498.3 

506.8 

515.2 

523.7 

71 

66.0 

0.638 

6.87 

4.27 

0.617 

473.2 

481.6 

490.1 

498.5 

507.0 

515.4 

523.9 

70 

64.5 

0.607 

6.54 

4.60 

0.587 

473.4 

481.8 

490.3 

498.7 

507.2 

515.6 

524.1 

69 

63.0 

0.578 

6.22 

4.92 

0.558 

473.6 

482.0 

490.5 

498.9 

507.4 

515.8 

524.3 

68 

61.5 

0.550 

5.92 

5.22 

0.531 

473.7 

482.2 

490.7 

499.1 

507.6 

516.0 

524.5 

B 


130 


PSYCHROMETRICAL    TABLES. 


27 


Reading 
of  Ther- 
mometer, 
Fahr. 

]emp. 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight, 
of  Vapor 

Hu- 
midity, 
Satura- 
;ion  = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
ootof 
Air. 

iteqa. 
for 
Sat'n. 
faCu- 
ic  Ft. 
f  Air. 

Height  of  the  Barometer  in  English  Inches. 

in. 

2S.O 

in. 

28.5 

in. 

29.O 

in. 

29.5 

in. 

30.0 

in. 
30.5 

in. 

31.0 

Dry. 

Wet. 

0 

0 

0 

in. 

gr. 

gr- 

gr- 

gr- 

gr- 

gr- 

gr- 

gr- 

gr. 

81 

68 

61.5 

0.550 

5.92 

5.22 

0.531 

473.7 

482.2 

490.7 

499.1 

507.6 

516.0 

524.5 

67 

60.0 

0.523 

5.62 

5.52 

0.505 

473.8 

482.3 

490.8 

499.2 

507.7 

516.1 

524.6 

66 

58.5 

0.498 

5.31 

5.83 

0.477 

474.0 

482.5 

491.0 

499.4 

507.9 

516.3 

524.8 

65 

57.0 

0.473 

5.08 

6.06 

0.456 

474.1 

482.6 

491.1 

499.5 

508.0 

516.4 

524.9 

64 

55.5 

0.450 

4.84 

6.30 

0.434 

474.3 

482.8 

491.3 

499.7 

508.2 

516.6 

525.1 

63 

54.0 

0.428 

4.60 

6.54 

0.413 

474.4 

482.9 

491.4 

499.8 

508.3 

516.7 

525.2 

62 

52.5 

0.407 

4.37 

6.77 

0.392 

474.5 

483.0 

491.5 

499.9 

508.4 

516.8 

525.3 

61 

51.0 

0.386 

4.15 

6.99 

0.373 

474.6 

483.1 

491.6 

500.0 

508.5 

516.9 

525.4 

60 

49.5 

0.367 

3.95 

7.19 

0.355 

474.7 

483.2 

491.7 

500.1 

508.6 

517.0 

525.5 

59 

48.0 

0.349 

3.75 

7.39 

0.337 

474.9 

483.4 

491.9 

500.3 

508.8 

517.2 

525.7 

58 

46.5 

0.331 

3.56 

7.58 

0.320 

475.0 

483.5 

492.0 

500.4 

508.9 

517.3 

525.8 

57 

45.0 

0.315 

3.38 

7.76 

0.303 

475.1 

483.6 

492.1 

500.5 

509.0 

517.4 

525.9 

56 

43.5 

0.299 

3.21 

7.93 

0.289 

475.2 

483.7 

492.2 

500.6 

509.1 

517.5 

526.0 

55 

42.0 

0.283 

3.05 

8.09 

0.274 

475.3 

483.8 

492.3 

500.7 

509.2 

517.6 

526.1 

54 

40.5 

0.269 

2.90 

8.24 

0.260 

475.3 

483.8 

492.3 

500.7 

509.2 

517.6 

526.1 

82 

82 

82.0 

1.067 

11.47 

0.00 

1.000 

470.0 

478.4 

486.8 

495.2 

503.5 

511.9 

520.3 

81 

80.5 

1.017 

10.94 

0.53 

0.954 

470.3 

478.7 

487.0 

495.4 

503.8 

512.2 

520.6 

80 

79.0 

0.970 

10.44 

1.03 

0.910 

470.6 

479.0 

487.3 

495.7 

504.1 

512.5 

520.9 

79 

77.5 

0.925 

9.95 

1.52 

0^868 

470.7 

479.1 

487.5 

495.9 

504.3 

512.7 

521.1 

78 

76.0 

0.882 

9.49 

1.98 

0.827 

471.0 

479.4 

487.8 

496.2 

504.6 

513.0 

521.4 

77 

74.5 

0.840 

9.03 

2.44 

0.787 

471.2 

479.6 

488.0 

496.4 

504.8 

513.2 

521.6 

76 

73.0 

0.801 

8.60 

2.87 

0.750 

471.5 

479.9 

488.3 

496.7 

505.1 

513.5 

521.9 

75 

71.5 

0.763 

8.19 

3.28 

0.714 

471.6 

480.0 

488.5 

496.9 

505.3 

513.7 

522.1 

74 

70.0 

0.727 

7.81 

3.66 

0.681 

471.8 

480.2 

488.6 

497.1 

505.5 

513.9 

522.4 

73 

68.5 

0.692 

7.43 

4.04 

0.648 

472.0 

480.4 

488.8 

497.3 

505.7 

514.1 

522.6 

72 

67.0 

0.659 

7.08 

4.39 

0.618 

472.2 

480.6 

489.0 

497.5 

505.9 

514.3 

522.8 

71 

65.5 

0.628 

6.75 

4.72 

0.588 

472.4 

480.8 

489.2 

497.7 

506.1 

514.5 

523.0 

70 

64.0 

0.597 

6.41 

5.06 

0.559 

472.5 

480.8 

489.4 

497.9 

506.3 

514.7 

523.2 

69 

62.5 

0.568 

6.10 

5.37 

0.532 

472.6 

481.0 

489.5 

498.0 

506.4 

514.8 

523.3 

68 

61.0 

0.541 

5.81 

5.66 

0.507 

472.8 

481.2 

489.7 

498.2 

506.6 

515.0 

523.5 

67 

59.5 

0.515 

5.52 

5.95 

0.481 

473.0 

481.4 

489.9 

498.4 

506.8 

515.2 

523.7 

66 

58.0 

0.489 

5.25 

6.22 

0.458 

473.1 

481.5 

490.0 

498.5 

506.9 

515.3 

523.8 

65 

56.5 

0.465 

4.99 

6.48 

0.435 

473.2 

481.6 

490.1 

498.6 

507.0 

515.4 

523.9 

64 

55.0 

0.442 

4.75 

6.72 

0.414 

473.4 

481.8 

490.3 

498.8 

507.2 

515.6 

524.1 

63 

53.5 

0.421 

4.51 

6.96 

0.393 

473.5 

482.0 

490.5 

499.0 

507.4 

515.8 

524.3 

62 

52.0 

0.400 

4.29 

7.18 

0.374 

473.6 

482.1 

490.6 

499.1 

507.5 

515.9 

524.4 

61 

50.5 

0.380 

4.08 

7.39 

0.356 

473.7 

482.2 

490.7 

499.2 

507.6 

516.0 

524.4 

60 

49.0 

0.361 

3.87 

7.60 

0.337 

473.8 

482.3 

490.8 

499.3 

507.7 

516.1 

524.5 

59 

47.5 

0.343 

3.68 

7.79 

0.320 

473.9 

482.4 

490.9 

499.4 

507.8 

516.2 

524.6 

58 

46.0 

0.326 

3.50 

7.97 

0.305 

474.0 

482.5 

491.0 

499.5 

507.9 

516.3 

524.7 

57 

44.5 

0.309 

3.32 

8.15 

0.289 

474.1 

482.6 

491.1 

499.6 

508.0 

516.4 

524.8 

56 

43.0 

0.293 

3.15 

8.32 

0.274 

474.2 

482.7 

491.2 

499.7 

508.1 

516.5 

524.9 

55 

,41.5 

0.279 

2.99 

8.48 

0.260 

474.3 

482.8 

491.3 

499.8 

508.2 

516.6 

525.1 

B 


131 


28 


PSYCHROMETRICAL    TABLES. 


Re? 
of 
moi 
F 

Dry. 

iding 
Iher- 
neter, 
ihr. 

Wet. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

1.000. 

in. 

28.0 

in. 

28.5 

in. 

29.0 

in. 

20.5 

in. 

30.0 

in. 
30.5 

in. 

31.O 

o 

o 

o 

in. 

gr. 

gr- 

gr. 

gr. 

gr. 

gr- 

gr- 

gr- 

gr. 

83 

83 

83.0 

1.101 

11.82 

0.00 

1.000 

468.8 

477.2 

485.5 

493.9 

502.3 

510.6 

519.0 

82 

81.5 

1.050 

11.27 

0.55 

0.953 

469.1 

477.5 

485.8 

494.2 

502.6 

511.0 

519.4 

81 

80.0 

1.001 

10.75 

1.07 

0.909 

469.4 

477.8 

486.1 

494.5 

502.9 

511.3 

519.7 

80 

78.5 

0.955 

10.25 

1.57 

0.868 

469.7 

478.1 

486.4 

494.8 

503.2 

511.6 

520.0 

79 

77.0 

0.910 

9.78 

2.04 

0.828 

470.0 

478.4 

486.7 

495.1 

503.5 

511.9 

520.3 

78 

75.5 

0.868 

9.31 

2.51 

0.786 

470.3 

478.7 

487.0 

495.4 

503.8 

512.2 

520.6 

77 

74.0 

0.827 

8.88 

2.94 

0.751 

470.5 

478.9 

487.2 

495.6 

504.0 

512.4 

520.8 

76, 

72.5 

0.787 

8.45 

3.37 

0.715 

470.6 

479.0 

487.4 

495.8 

504.2 

512.6 

521.0 

75 

71.0 

0.751 

8.05 

3.77 

0.681 

470.8 

479.2 

487.6 

496.0 

504.4 

512.8 

521.2 

74 

69.5 

0.715 

7.66 

4.16 

0.647 

471.0 

479.4 

487.8 

496.2 

504.6 

513.0 

521.4 

73 

68.0 

0.681 

7.30 

4.52 

0.618 

471.2 

479.6 

488.0 

496.4 

504.8 

513.2 

521.6 

72 

66.5 

0.648 

6.95 

4.87 

0.588 

471.4 

479.8 

488.2 

496.6 

505.0 

513.4 

521.8 

71 

65.0 

0.617 

6.62 

5.20 

0.560 

471.6 

480.0 

488.4 

496.8 

505.2 

513.6 

522.0 

70 

63.5 

0.588 

6.29 

5.53 

0.533 

471.7 

480.1 

488.5 

497.0 

505.4 

513.8 

522.3 

69 

62.0 

0.559 

5.99 

5.83 

0.507 

471.9 

480.3 

488.7 

497.2 

505.6 

514.0 

522.5 

68 

60.5 

0.532 

5.70 

6.12 

0.482 

472.0 

480.4 

488.8 

497.3 

505.7 

514.1 

522.6 

67 

59.0 

0.506 

5.42 

6.40 

0.459 

472.2 

480.6 

489.0 

497.5 

505.9 

514.3 

522.8 

66 

57.5 

0.481 

5.15 

6.67 

0.435 

472.4 

480.8 

489.2 

497.7 

506.1 

514.5 

523.0 

65 

56.0 

0.458 

4.90 

6.92 

0.414 

472.4 

480.8 

489.3 

497.8 

506.2 

514.6 

523.1 

64 

54.5 

0.435 

4.66 

7.18 

0.394 

472.5 

480.9 

489.4 

497.9 

506.3 

514.7 

523.2 

63 

53.0 

0.414 

4.43 

7.39 

0.375 

472.7 

481.1 

489.6 

498.1 

506.5 

514.9 

523.4 

62 

51.5 

0.393 

4.21 

7.61 

0.356 

472.8 

481.2 

489.7 

498.2 

506.6 

515.0 

523.5   ! 

61 

50.0 

0.373 

4.00 

7.82 

0.339 

472.9 

481.3 

489.8 

498.3 

506.7 

515.1 

523.6 

60 

48.5 

0.355 

3.80 

8.02 

0.322 

473.1 

481.4 

489.9 

498.4 

506.8 

515.2 

523.7 

59 

47.0 

0.337 

3.60 

8.22 

0.305 

473.2 

481.5 

490.0 

498.5 

506.9 

515.3 

523.8 

58 

45.5 

0.320 

3.42 

8.40 

0.289 

473.3 

481.6 

490.1 

498.6 

507.0 

515.4 

523.9 

57 

44.0 

0.304 

3.25 

8.57 

0.276 

473.4 

481.7 

490.2 

498.7 

507.1 

515.5 

524.0 

56 

42.5 

0.288 

3.09 

8.73 

0.261 

473.5 

481.8 

490.3 

498.8 

507.2 

515.6 

524.1 

84 

84 

84.0 

1.136 

12.17 

0.00 

1.000 

467.8 

476.2 

484.5 

492.7 

501.2 

509.6 

517.9 

83 

82.5 

1.083 

11.61 

0.56 

0.954 

468.1 

476.4 

484.8 

493.2 

501.5 

509.8 

518.2 

82 

81.0 

1.034 

11.07 

1.10 

0.910 

468.4 

476.7 

485.1 

493.5 

501.8 

510.1 

518.5 

81 

79.5 

0.986 

10.55 

1.62 

0.867 

468.6 

476.9 

485.4 

493.7 

502.1 

510.5 

518.8 

80 

78.0 

0.940 

10.07 

2.10 

0.827 

468.9 

477.3 

485.7 

494.0 

502.4 

510.8 

519.1 

79 

76.5 

0.896 

9.59 

2.58 

0.788 

469.1 

477.5 

485.9 

494.2 

502.6 

511.0 

519.3 

78 

75.0 

0.854 

9.14 

3.03 

0.751 

469.4 

477.8 

486.1 

494,5 

502.9 

511.3 

519.7 

77 

73.5 

0.814 

8.71 

3.46 

0.716 

469.6 

478.0 

486.3 

494.7 

503.1 

511.5 

519.9 

76 

72.0 

0.776 

8.30 

3.87 

0.682 

469.8 

478.2 

486.5 

494.9 

503.3 

511.7 

520.1 

75 

70.5 

0.739 

7.90 

4.27 

0.649 

470.1 

478.5 

486.8 

495.2 

503.6 

512.0 

520.4 

74 

69.0 

0.704 

7.53 

4.64 

0.619 

470.3 

478.7 

487.0 

495.4 

503.8 

512.2 

520.6 

-. 

73 

67.5 

0.670 

7.17 

5.00 

0.589 

470.5 

478.9 

487.2 

495.6 

504.0 

512.4 

520.8 

72 

66.0 

0.638 

6.83 

5:34 

0.561 

470.6 

479.0 

487.4 

495.8 

504.2 

512.6 

521.0 

71 

64.5 

0.607 

6.50 

5.67 

0.534 

470.7 

479.1 

487.5 

495.9 

504.3 

512.7 

521.1 

B 


132 


PSYCHROMETRICAL    TABLES. 


29 


Reading 
of  Ther- 
mometer, 
Fakr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 

English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

Wet. 

in. 

28.0 

in. 

28.5 

in. 

29.0 

in. 

29.5 

in. 

3O.O 

*  in. 

3O.5 

in. 

31.O 

o 
84 

o 
71 

0 

64.5 

in. 
0.607 

gr. 
6.50 

gr. 
5.67 

0.534 

gr. 
470.7 

gr. 
479.1 

gr. 
487.5 

gr. 
495.9 

gr. 
504.3 

gr- 
512.7 

gr. 
521.1 

70 

63.0 

0.578 

6.18 

5.99 

0.508 

470.9 

479^.8 

487.7 

496.1 

504.5 

512.9 

521.3 

69 

61.5 

0.550 

5.87 

6.30 

0.482 

471.1 

479.5 

487.9 

496.3 

504.7 

513.1 

521.5 

68 

60.0 

0.523 

5.59 

6.58 

0.459 

471.2 

479.6 

488.0 

496.4 

504.8 

513.2 

521.6 

67 

58.5 

0.498 

5.31 

6.86 

0.436 

471.4 

479.8 

488.2 

496.6 

505.0 

513.4 

521.8 

66 

57.0 

0.473 

5.05 

7.12 

0.415 

471.6 

480.0 

488.3 

496.7 

505.2 

513.6 

522.1 

65 

55.5 

0.450 

4.81 

7.36 

0.395 

471.6 

480.0 

488.4 

496.8 

505.3 

513.7 

522.2 

64 

54.0 

0.428 

4.57 

7.60 

0.375 

471.7 

480.1 

488.5 

496.9 

505.4 

513.8 

522.3 

63 

52.5 

0.407 

4.35 

7.82 

0.357 

471.8 

480.2 

488.6 

497.0 

505.5 

513.9 

522.4 

62 

51.0 

0.386 

4.13 

8.04 

0.339 

471.9 

480.4 

488.8 

497.2 

505.7 

514.0 

522.5 

61 

49.5 

0.367 

3.93 

8.24 

0.323 

472.1 

480.5 

488.9 

497.3 

505.8 

514.1 

522.6 

60 

48.0 

0.349 

3.73 

8.44 

0.306 

472.2 

480.6 

489.0 

497.4 

505.9 

514.2 

522.7 

59 

46.5 

0.331 

3.55 

8.62 

0.292 

472.3 

480.7 

489.1 

497.5 

506.0 

514.3 

522.8 

.33 

45.0 

0.315 

3.37 

8.80 

0.277 

472.4 

480.8 

489.2 

497.6 

506.1 

514.4 

522.9 

57 

43.5 

0.299 

3.20 

8.97 

0.263 

472.5 

480.9 

489.3 

497.7 

506.2 

514.5 

523.0 

85 

S5 

85.0 

1.171 

12.53 

0.00 

1.000 

466.8 

475.2 

483.5 

491.8 

500.1 

508.5 

516.8 

84 

83.5 

1.118 

11.95 

0.58 

0.954 

467.1 

475.4 

483.7 

492.1 

500.4 

508.7 

517.1 

83 

82.0 

1.067 

11.40 

1.13 

0.910 

467.3 

475.6 

484.0 

492.4 

500.7 

509.0 

517.4 

82 

80.5 

1.017 

10.87 

1.66 

0.868 

467.6 

475.9 

484.3 

492.7 

501.0 

509.3 

517.7 

81 

79.0 

0.970 

10.38 

2.15 

0.829 

467.8 

476.1 

484.5 

492.9 

501.2 

509.5 

517.9 

80 

77.5 

0.925 

9.89 

2.64 

0.789 

468.1 

476.4 

484.8 

493.2 

501.5 

509.8 

518.2 

79 

76.0 

0.882 

9.43 

3.10 

0.753 

468.4 

476.7 

485.1 

493.5 

501.8 

510.1 

518.5 

78 

74.5 

0.840 

8.98 

3.55 

0.717 

468.6 

476.9 

485.3 

493.7 

502.0 

510.3 

518.7 

77 

73.0 

0.801 

8.55 

3.98 

0.682 

468.7 

477.1 

485.5 

493.9 

502.2 

510.5 

518.9 

76 

71.5 

0.763 

8.15 

4.38 

0.650 

469.0 

477.4 

485.8 

494.2 

502.5 

510.8 

519.2 

75 

70.0 

0.727 

7.76 

4.77 

0.619 

469.2 

477.6 

486.0 

494.4 

502.7 

511.0 

519.4 

74 

68.5 

0.692 

7.39 

5.14 

0.589 

469.4 

477.8 

486.2 

494.6 

502.9 

511.2 

519.6 

73 

67.0 

0.659 

7.04 

5.49 

0.562 

469.7 

478.1 

486.5 

494.9 

503.2 

511.5 

519.9 

72 

65.5 

0.628 

6.71 

5.82 

0.536 

469.9 

478.3 

486.7 

495.1 

503.4 

511.7 

520.1 

71 

64.0 

0.597 

6.37 

6.16 

0.508 

470.1 

478.5 

486.9 

495.3 

503.6 

511.9 

520.3 

70 

62.5 

0.568 

6.07 

6.46 

0.484 

470.3 

478.7 

487.1 

495.5 

503.8 

512.1 

520.5 

69 

61.0 

0.541 

5.77 

6.76 

0.460 

470.5 

478.9 

487.2 

495.6 

504.0 

512.4 

520.8 

68 

59.5 

0.515 

5.4S 

7.05 

0.437 

470.6 

479.0 

487.3 

495.7 

504.1 

513.5 

520.9 

67 

58.0 

0.489 

5.21 

7.32 

0.415 

470.6 

479.0 

487.4 

495.8 

504.2 

512.6 

521.0 

66 

56.5 

0.465 

4.96 

7.57 

0.396 

470.7 

479.1 

487.5 

495.9 

504.3 

512.7 

521.1 

65 

55.0 

0.442 

4.72 

7.81 

0.377 

470.8 

479.2 

487.6 

496.0 

504.4 

512.8 

521.2 

64 

53.5 

0.421 

4.49 

8.04 

0.359 

470.9 

479.3 

487.7 

496.1 

504.5 

512.9 

521.3 

63 

52.0 

0.400 

4.26 

8.27 

0.340 

471.1 

479.5 

487.9 

496.3 

504.7 

513.1 

521.5 

62 

50.5 

0.380 

4.05 

8.48 

0.323 

471.2 

479.6 

488.1 

496.4 

504.8 

513.2 

521.6 

61 

49.0 

0.361 

3.85 

8.68 

0.307 

471.3 

479.7 

488.2 

496.5 

504.9 

513.3 

521.7 

60 

47.5 

0.343 

3.66 

8.87 

0.292 

471.4 

479.8 

488.3 

496.6 

505.0 

513.4 

521.8 

59 

46.0 

0.326 

3.48 

9.05 

0.278 

471.5 

479.9 

488.4 

496.7 

505.1 

513.5 

521.9 

58 

44.5 

0.309 

3.31 

9.22 

0.264 

471.6 

480.1 

488.5 

496.8 

505.2 

5^3.6 

522.1 

B 


133 


30 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 
Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

o 
86 

Wet. 

in. 

28.0 

in. 
28.5 

in. 
29.O 

in. 

29.5 

in. 

30.0 

in. 

30.5 

in. 
31.0 

o 
86 

0 

86.0 

in. 
.209 

gr- 
12.91 

gr. 
0.00 

1.000 

gr. 
465.7 

gr. 
474.0 

gr. 
482.3 

gr. 
490.6 

gr. 
498.9 

gr- 
507.2 

gr. 
515.5 

85 

84.5 

.153 

12.31 

0.60 

0.954 

466.0 

474.3 

482.6 

490.9 

499.2 

507.5 

515.8 

84 

83.0 

.101 

11.75 

1.16 

0.910 

466.3 

474.6 

482.9 

491.2 

499.5 

507.8 

516.1 

83 

81.5 

.050 

11.20 

1.71 

0.868 

466.5 

474.8 

483.2 

491.5 

499.8 

508.1 

516.5 

82 

80.0 

.001 

10.69 

2.22 

0.828 

466.8 

475.1 

483.5 

491.8 

500.1 

508.4 

516.8 

81 

78.5 

0.955 

10.19 

2.72 

0.789 

467.1 

475.4 

483.8 

492.1 

500.4 

508.7 

517.1 

80 

77.0 

0.910 

9.71 

3.20 

0.752 

467.3 

475.6 

484.0 

492.3 

500.7 

509.0 

517.4 

79 

75.5 

0.868 

9.25 

3.66 

0.717 

467.5 

475.8 

484.2 

492.5 

500.9 

509.2 

517.6 

78 

74.0 

0.827 

8.82 

4.09 

0.683 

467.8 

476.1 

484.5 

492.8 

501.2 

509.5 

517.9 

77 

72.5 

0.787 

8.40 

4.51 

0.651 

468.0 

476.3 

484.7 

493.0 

501.4 

509.7 

518.1 

76 

71.0 

0.751 

8.00 

4.91 

0.619 

468.2 

476.5 

484.9 

493.2 

501.6 

509.9 

518.3 

75 

69.5 

0.715 

7.62 

5.29 

0.590 

468.3 

476.6 

485.0 

493.4 

501.8 

510.2 

518.6 

74 

68.0 

0.681 

7.26 

5.65 

0.562 

468.5 

476.8 

485.2 

493.6 

502.0 

510.4 

518.8 

73 

66.5 

0.648 

6.91 

6.00 

0.535 

468.8 

477.1 

485.5 

493.9 

502.2 

510.6 

519.0 

72 

65.0 

0.617 

6.58 

6.33 

0.509 

468.9 

477.2 

485.6 

494.0 

502.4 

510.8 

519.2 

71 

63.5 

0.588 

6.26 

6.65 

0.485 

469.1 

477.4 

485.8 

494.2 

502.6 

511.0 

519.4 

70 

62.0 

0.559 

5.95 

6.96 

0.461 

469.2 

477.5 

485.9 

494.3 

502.7 

511.1 

519.5 

69 

60.5 

0.532 

5.66 

7.25 

0.438 

469.4 

477.7 

486.1 

494.5 

502.9 

511.3 

519.7 

68 

59.0 

0.506 

5.38 

7.53 

0.417 

469.6 

477.9 

486.3 

494.7 

503.1 

511.5 

519.9 

67 

57.5 

0.481 

5.11 

7.80 

0.396 

469.8 

478.1 

486.5 

494.9 

503.3 

511.7 

520.1 

66 

56.0 

0.458 

4.87 

8.04 

0.377 

469.9 

478.2 

486.6 

495.0 

503.4 

511.8 

520.2 

65 

54.5 

0.435 

4.63 

8.28 

0.359 

,  470.0 

478.3 

486.7 

495.1 

503.5 

511.9 

520.3 

64 

53.0 

0.414 

4.40 

8.51 

0.341 

470.1 

478.4 

486.8 

495.1 

503.6 

512.0 

520.4 

63 

51.5 

0.393 

4.19 

8.72 

0.325 

470.2 

478.5 

486.9 

495.2 

503.7 

512.1 

520.5 

62 

50.0 

0.373 

3.98 

8.93 

0.308 

470.4 

478.7 

487.1 

495.4 

503.9 

512.2 

520.7 

61 

48.5 

0.355 

3.78 

9.13 

0.293 

470.5 

478.8 

487.2 

495.5 

504.0 

512.3 

520.8 

60 

47.0 

0.337 

3.59 

9.32 

0.278 

470.6 

478.9 

487.3 

495.6 

504.1 

512.4 

520.9 

59 

45.5 

0.320 

3.40 

9.51 

0.263 

470.7 

479.0 

487.4 

495.7 

504.2 

512.5 

521.0 

87 

87 

87.0 

1.247 

13.29 

0.00 

1.000 

464.5 

472.8 

48.1.1 

489.4 

497.7 

506.0 

514.3 

86 

85.5 

1.190 

12.68 

0.61 

0.954 

464.8 

473.1 

481.4 

489.7 

498.0 

506.3 

514.6 

85 

84.0 

1.136 

12.10 

1.19 

0.910 

465.1 

473.4 

481.7 

490.0 

498.3 

506.6 

514.9 

84 

82.5 

1.083 

11.54 

1.75 

0.868 

465.4 

473.7 

482.0 

490.3 

498.6 

506.9 

515.2 

83 

81.0 

1.034 

11.01 

2.28 

0.828 

465.7 

474.0 

482.3 

490.6 

498.9 

507.2 

515.5 

82 

79.5 

0.986 

10.49 

2.80 

0.789 

466.0 

474.3 

482.6 

490.9 

499.2 

507.5 

515.8 

81 

78.0 

0.940 

10.01 

3.28 

0.753 

466.3 

474.6 

482.9 

491.2 

499.5 

507.8 

516.1 

80 

76.5 

0.896 

9.54 

3.75 

0.718 

466.5 

474.8 

483.1 

491.4 

499.8 

508.1 

516.5 

79 

75.0 

0.854 

9.09 

4.20 

0.684 

466.8 

475.1 

483.5 

491.8 

500.1 

508.4 

516.8 

78 

73.5 

0.814 

8.66 

4.63 

0.652 

467.0 

475.3 

483.7 

492.0 

500.3 

508.6 

517.0 

77 

72.0 

0.776 

.  8.24 

5.05 

0.620 

467.2 

475.5 

483.9 

492.2 

500.5 

508.8 

517.2 

76 

70.5 

0.739 

7.85 

5.44 

0.591 

467.3 

475.6 

484.0 

492.3 

500.7 

509.0 

517.4 

75 

69.0 

0.704 

7.48 

5.81 

0.563 

467.5 

475.8 

4S4.2 

492.5 

500.9 

509.2 

517.6 

74 

67.5 

0.670 

7.12 

6.17 

0.536 

467.7 

476.0 

484.4 

492.7 

501.1 

509.4 

517.8 

p, 


134 


PSYCHROMETRICAL    TABLES. 


31 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 
1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
Foot  of 
Air. 

jveiju.. 

for 
Sat'n. 
ofaCu- 
bic  Ft. 
f  Air. 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

Wet. 

in. 

28.0 

in. 

28.5 

in. 

29.0 

in. 

29.5 

in. 
3O.O 

in. 

3O.5 

in. 

31.0 

o 

o 

o 

in. 

gr. 

gr. 

gr. 

gr. 

gr. 

gr. 

gr- 

gr- 

gr- 

87 

74 

67.5 

0.670 

7.12 

6.17 

0.536 

467.7 

476.0 

484.4 

492.7 

501.1 

509.4 

517.8 

73 

66.0 

0.638 

6.78 

6.51 

0.510 

467.9 

476.2 

484.6 

492.9 

501.3 

509.6 

518.0 

72 

64.5 

0.607 

6.46 

6.83 

0.486 

468.1 

476.4 

484.8 

493.1 

501.5 

509.8 

518.2 

71 

63.0 

0.578 

6.14 

7.15 

0.462 

468.3 

476.6 

485.0 

493.3 

501.7 

510.1 

518.5 

70 

61.5 

0.550 

5.85 

7.44 

0.440 

468.4 

476.7 

485.1 

493.5 

501.9 

510.3 

518.7 

69 

60.0 

0.523 

5.56 

7.73 

0.418 

468.5 

476.9 

485.3 

493.7 

502.0 

510.4 

518.8 

68 

58.5 

0.498 

5.28 

8.01 

0.397 

468.7 

477.1 

485.5 

493.9 

502.2 

510.6 

519.0 

67 

57.0 

0.473 

5.02 

8.27 

0.378 

468.8 

477.2 

485.6 

494.0 

502.3 

510.7 

519.1 

66 

55.5 

0.450 

4.77 

8.52 

0.359 

468.9 

477.3 

485.7 

494.1 

502.4 

510.7 

519.2 

65 

54.0 

0.428 

4.54 

8.75 

0.342 

469.1 

477.5 

485.9 

494.3 

502.6 

510.9 

519.4 

64 

52.5 

0.407 

4.33 

8.96 

0.326 

469.2 

477.6 

486.1 

494.4 

502.7 

511.0 

519.5 

63 

51.0 

0.386 

4.12 

9.17 

0.310 

469.3 

477.7 

486.2 

494.5 

02.8 

611.1 

519.6 

62 

49.5 

0.367 

3.91 

9.38 

0.294 

469.4 

477.8 

486.3 

494.6 

>02.9 

511.2 

519.7 

61 

48.0 

0.349 

3.71 

9.58 

0.279 

469.6 

477.9 

486.5 

494.8 

503.1 

511.4 

519.9 

60 

46.5 

0.331 

3.51 

9.78 

0.264 

469.7 

478.1 

486.6 

494.9 

503.2 

511.5 

520.0 

88 

88 

88.0 

1.2S6 

13.68 

0.00 

1.000 

463.5 

471.7 

480.0 

488.3 

496.6 

504.8 

513.1 

87 

86.5 

1.228 

13.06 

0.62 

0.954 

463.8 

472.0 

480.3 

488.6 

496.9 

505.1 

513.4 

86 

85.0 

1.171 

12.46 

1.22 

0.911 

464.2 

472.4 

480.7 

489.0 

497.3 

505.6 

513.9 

85 

83.5 

1.118 

11.88 

1.80 

0.868 

464.4 

472.7 

481.0 

489.3 

497.6 

505.9 

514.2 

84 

82.0 

1.067 

11.34 

2.34 

0.829 

464.7 

473.0 

481.3 

489.6 

497.9 

506.2 

514.5 

83 

80.5 

1.017 

10.81 

2.87 

0.790 

465.0 

473.3 

481.6 

489.9 

498.2 

506.5 

514.8 

82 

79.0 

0.970 

10.31 

3.37 

0.754 

465.2 

473.5 

481.8 

490.1 

498.4 

506.7 

515.0 

81 

77.5 

0.925 

9.83 

3.85 

0.718 

465.5 

473.8 

482.1 

490.4 

498.7 

507.0 

515.3 

80 

76.0 

0.882 

9.37 

4.31 

0.685 

465.8 

474.1 

482.4 

490.7 

499.0 

507.3 

515.6 

79 

74.5 

0.840 

8.93 

4.75 

0.653 

466.1 

474.4 

482.7 

491.0 

499.3 

507.6 

515.9 

78 

73.0 

0.801 

8.50 

5.18 

0.621 

466.3 

474.6 

482.9 

491.2 

499.5 

507.8 

516.2 

77 

71.5 

0.763 

8.09 

5.59 

0.591 

466.4 

474.7 

483.0 

491.3 

499.7 

508.0 

516.4 

76 

70.0 

0.727 

7.71 

5.97 

0.563 

466.6 

474.9 

483.2 

491.5 

499.9 

508.2 

516.6 

75 

68.5 

0.692 

7.34 

6.34 

0.537 

466.8 

475.1 

483.4 

491.7 

500.1 

508.4 

516.8 

74 

67.0 

0.659 

6.99 

6.69 

0.511 

467.0 

475.3 

483.6 

491.9 

500.3 

508.6 

517.0 

73 

65.5 

0.628 

6.66 

7.02 

0.487 

467.2 

475.5 

483.8 

492.1 

500.5 

508.8 

517.2 

72 

64.0 

0.597 

6.33 

7.35 

0.463 

467.4 

475.7 

484.0 

492.3 

500.7 

509.0 

517.4 

71 

62.5 

0.568 

6.03 

7.65 

0.441 

467.4 

475.7 

484.0 

492.4 

500.8 

509.1 

517.5 

70 

61.0 

0.541 

5.74 

7.94 

0.420 

467.6 

475.9 

484.2 

492.6 

501.0 

509.3 

517.7 

69 

59.5 

0.515 

5.45 

8.23 

0.398 

467.7 

476.0 

484.3 

492.7 

501.2 

509.4 

517.8 

68 

58.0 

0.489 

5.18 

8.50 

0.378 

467.9 

476.2 

484.5 

492.9 

501.3 

509.6 

518.0 

67 

56.5 

0.465 

4.93 

8.75 

0.359 

468.1 

476.4 

484.7 

493.1 

501.5 

509.8 

518.2 

66 

55.0 

0.442 

4.69 

8.99 

0.342 

468.2 

476.5 

484.8 

493.2 

501.6 

509.9 

518.3 

65 

53.5 

0.421 

4.47 

9.21 

0.326 

468.3 

476.6 

484.9 

493.3 

501.7 

510.0 

518.4 

64 

52.0 

0.400 

4.25 

9.43 

0.310 

468.4 

476.7 

485.1 

493.4 

501.8 

510.1 

518.5 

63 

50.5 

0.380 

4.04 

9.64 

0.295 

468.6 

476.9 

485.3 

493.6 

502.0 

510.3 

518.7 

62 

49.0 

0.361 

3.83 

9.85 

0.280 

468.7 

477.1 

485.4 

493.7 

502.1 

510.4 

518.8 

61 

47.5 

0.343 

3.62 

10.06 

0.265 

468.8 

477.2 

485.5 

493.8 

502.2 

510.5 

518.9 

B 


135 


PSYCHROMETRICAL    TABLES. 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 
Point, 
Fahr. 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion = 

1.000. 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
Foot  of 
Air. 

Reqd. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

Dry. 

o 
89 

Wet. 

in. 

28.0 

in. 
28.5 

in. 

29.  0 

in. 

29.5 

in. 

30.0 

in. 

30.5 

in. 

31.O 

o 
89 

o 
89.0 

in. 
.326 

gr. 
14.08 

gr 
0.00 

1.000 

gr. 
462.4 

gr. 
470.6 

gr. 
478.9 

gr. 
487.1 

gr. 
495.4 

gr. 
503.6 

gr- 
511.9 

88 

87.5 

.266 

13.44 

0.64 

0.954 

462.7 

470.9 

479.2 

487.4 

495.7 

503.9 

512.2 

87 

86.0 

.209 

12.84 

1.24 

0.912 

463.0 

471.2 

479.5 

487.8 

496.1 

504.4 

512.7 

86 

84.5 

.153 

12.24 

1.84 

0.869 

463.3 

471.5 

479.8 

488.1 

496.4 

504.7 

513.0 

85 

83.0 

.101 

11.68 

2.40 

0.830 

463.6 

471.8 

480.1 

488.4 

496.7 

505.0 

513.3 

84 

81.5 

.050 

11.13 

2.95 

0.791 

464.0 

472.2 

480.5 

488.8 

497.1 

505.4 

513.7 

83 

80.0 

.001 

10.62 

3.46 

0.754 

464.2 

472.5 

480.8 

489.1 

497.4 

505.7 

514.0 

82 

78.5 

0.955 

10.13 

3.95 

0.719 

464.4 

472.7 

481.0 

489.3 

497.6 

505.9 

514.2 

81 

77.0 

0.910 

9.66 

4.42 

0.686 

464.7 

473.0 

481.3 

489.6 

497.9 

506.2 

514.5 

80 

75.5 

0.868 

9.20 

4.88 

0.653 

464.9 

473.2 

481.5 

489.8 

498.1 

506.4 

514.7 

79 

74.0 

0.827 

8.77 

5.31 

0.623 

465.2 

473.5 

481.8 

490.1 

498.4 

506.7 

515.0 

78 

72.5 

0.787 

8.35 

5.73 

0.593 

465.4 

473.7 

482.0 

490.3 

498.6 

506.9 

515.2 

77 

71.0 

0.751 

7.96 

6.12 

0.565 

465.6 

473.9 

482.2 

490.5 

498.8 

507.1 

515.4 

76 

69.5 

0.715 

7.57 

6.51 

0.537 

465.8 

474.1 

482.4 

490.7 

499.0 

507.3 

515.7 

75 

68.0 

0.681 

7.21 

6.87 

0.512 

466.0 

474.3 

482.6 

490.9 

499.2 

507.5 

515.8 

74 

66.5 

0.648 

6.87 

7.21 

0.488 

466.2 

474.5 

482.8 

491.1 

499.4 

507.7 

516.0 

73 

65.0 

0.617 

6.54 

7.54 

0.465 

466.3 

474.6 

482.9 

491.2 

499.6 

507.9 

516.3 

72 

63.5 

0.588 

6.22 

7.86 

0.442 

466.5 

474.8 

483.1 

491.4 

499.8 

508.1 

516.5 

71 

62.0 

0.559 

5.91 

8.17 

0.420 

466.7 

475.0 

483.3 

491.7 

500.0 

508.3 

516.7 

70 

60.5 

0.532 

5.62 

8.46 

0.399 

466.8 

475.1 

483.4 

491.8 

500.1 

508.4 

516.8 

69 

59.0 

0.506 

5.35 

8.73 

0.380 

467.0 

475.3 

483.6 

492.0 

500.3 

508.6 

517.0 

68 

57.5 

0.481 

5.08 

9.00 

0.361 

467.1 

475.4 

483.7 

492.1 

500.4 

508.7 

517.1 

67 

56.0 

0.458 

4.84 

9.24 

0.343 

467.2 

475.5 

483.8 

492.2 

500.5 

508.8 

517.2 

66 

54.5 

0.435 

4.61 

9.47 

0.327 

467.4 

475.7 

483.9 

492.4 

500.7 

509.1 

517.4 

65 

53.0 

0.414 

4.39 

9.69 

0.312 

467.5 

475.8 

484.1 

492.5 

500.8 

509.2 

517.5 

64 

51.5 

0.393 

4.17 

9.91 

0.296 

467.6 

475.9 

484.2 

492.6 

500.9 

509.3 

517.6 

63 

50.0 

0.373 

3.96 

10.12 

0.281 

467.7 

476.1 

484.3 

492.7 

501.0 

509.4 

517.7 

62 

48.5 

0.355 

3.76 

10.32 

0.267 

467.8 

476.2 

484.4 

492.8 

501.1 

509.5 

517.8 

90 

90 

90.0 

.368 

14.50 

0.00 

1.000 

461.3 

469.5 

477.8 

486.0 

494.3 

502.5 

510.8 

89 

88.5 

.306 

13.84 

0.66 

0.954 

461.6 

469.8 

478.1 

486.3 

494.6 

502.8 

511.1 

88 

87.0 

.247 

13.22 

1.28 

0.910 

462.0 

470.2 

478.5 

486.7 

495.0 

503.2 

511.5 

87 

85.5 

.190 

12.61 

1.89 

0.870 

462.3 

470.5 

478.8 

487.0 

495.3 

503.5 

511.8 

86  t 

84.0 

.136 

12.03 

2.47 

0.830 

462.7 

470.9 

479.2 

487.4 

495.7 

503.9 

512.1 

85 

82.5 

.083 

11.47 

3.03 

0.791 

463.0 

471.2 

479.5 

487.7 

496.0 

504.2 

512.5 

84 

81.0 

.034 

10.94 

3.56 

0.755 

463.2 

471.5 

479.8 

488.0 

496.3 

504.5 

512.8 

83 

79.5 

0.986 

10.43 

4.07 

0.719 

463.4 

471.7 

480.0 

488.2 

496.5 

504.7 

513.0 

82 

78.0 

0.940 

9.95 

4.55 

0.686 

463.7 

472.0 

480.3 

488.5 

496.8 

505.0 

513.3 

81 

76.5 

0.896 

9.48 

5.02 

0.653 

464.0 

472.3 

480.6 

488.8 

497.1 

505.3 

513.6 

80 

75.0 

0.854 

9.03 

5.47 

0.622 

464.2 

472.5 

480.7 

488.9 

497.3 

505.5 

513.9 

79 

73.5 

0.814 

8.61 

5.89 

0;594 

464.3 

472.6 

480.9 

489.1 

497.5 

505.7 

514.1 

78 

72.0 

0.776 

8.20 

6.30 

0*565 

464.5 

472.8 

481.1 

489.3 

497.7 

505.9 

514.3 

77 

70.5 

0.739 

7.80 

6.70 

0.538 

464.7 

473.0 

481.3 

489.5 

497.9 

506.1 

514.5 

B 


136 


PSYCHROMETRICAL    TABLES. 


33 


Reading 
of  Ther- 
mometer, 
Fahr. 

Temp, 
of 
Dew- 

Fahr.' 

Force 
of 
Vapor 
in 
English 
Inches. 

Weight 
of  Vapor 

Hu- 
midity, 
Satura- 
tion 

Weight  in  Grains  of  a  Cubic  Foot  of  Air. 

In  a 

Cubic 
Foot  of 
Air. 

ivequ.. 
for 
Sat'n. 
ofaCu- 
bic  Ft. 
of  Air. 

Height  of  the  Barometer  in  English  Inches. 

1.000. 

in. 

2S.O 

in. 

28.5 

29.0 

in. 

29.5 

in. 

30.0 

in. 

30.5 

in. 
31.0 

Dry. 

0 

90 

Wet. 

0 

77 

o 
70.5 

in. 
0.739 

gr- 
7.80 

gr- 
6.70 

0.538 

gr- 
464.7 

gr. 
473.0 

481.3 

489.5 

gr. 
497.9 

gr. 
506.1 

gr- 
514.5 

76 

69.0 

0.704 

7.43 

7.07 

0.512 

465.0 

473.3 

481.6 

489.8 

498.2 

506.4 

514.8 

75 

67.5 

0.670 

7.08 

7.42 

0.488 

465.2 

473.5 

481.8 

490.0 

498.4 

506.6 

515.0 

74 

66.0 

0.638 

6.74 

7.76 

0.465 

465.4 

473.7 

482.0 

490.2 

498.6 

506.8 

515.2 

73 

64.5 

0.607 

6.42 

8.08 

0.443 

465.6 

473.9 

482.2 

490.4 

498.8 

507.0 

515.4 

72 

63.0 

0.578 

6.10 

8.40 

0.421 

465.7 

474.0 

482.3 

490.5 

498.9 

507.1 

515.5 

71 

61.5 

0.550 

5.81 

8.69 

0.400 

465.9 

474.2 

482.5 

490.7 

499.1 

507.3 

515.7 

70 

60.0 

0.523 

5.52 

8.98 

0.381 

466.1 

474.4 

482.8 

491.0 

499.3 

507.5 

515.9 

69 

58.5 

0.498 

5.25 

9.25 

0.362 

466.2 

474.5 

482.9 

491.1 

499.4 

507.6 

516.0 

68 

57.0 

0.473 

4.99 

9.51 

0.344 

466.4 

474.7 

483.1 

491.3 

499.6 

507.8 

516.2 

67 

55.5 

0.450 

4.74 

9.76 

0.327 

466.5 

474.8 

483.2 

491.4 

499.7 

507.9 

516.3 

66 

54.0 

0.428 

4.52 

9.98 

0.312 

466.6 

474.9 

483.3 

491.5 

499.8 

508.0 

516.4 

65 

52.5 

0.407 

4.30 

10.20 

0.297 

466.7 

475.0 

483.4 

491.6 

499.9 

508.1 

516.5 

64 

51.0 

0.386 

4.09 

10.41 

0.282 

466.9 

475.2 

483.6 

491.8 

500.1 

508.3 

516.6 

63 

49.5 

0.367 

3.90 

10.60 

0.269 

467.0 

475.3 

483.7 

491.9 

500.2 

508.4 

£16.7 

B 


137 


TABLE    XIII. 

FACTORS    FOR   COMPUTING   THE    FORCE    OF   VAPOR,    FROM    THE    READINGS    OF   THE 
PSYCHROMETER,    BY   APJOHN's    FORMULA. 


DR.  APJOHN'S  formula  for  deducing  the  force  of  vapor,  and  the  temperature' of  the 
dew-point,  from  the  readings  of  the  Psychrometer,  as  given  in  the  Proceedings  of  the 
Royal  Irish  Academy  for  1840,  is 

f  a  —  f / —  v  — 

J    —J        88  *  30' 

when  the  readings  of  the  wet-bulb  thermometer  are  above  32°  Fahr.,  in  which  formula 

f"  =  the  force  of  vapor  at  the  temperature  of  the  dew-point  in  degrees  of  Fahr., 
f  =  the  force  of  vapor  at  the  temperature  of  evaporation  given  by  the  wet-bulb 

thermometer, 

d    =  the  difference  between  the  readings  of  the  dry  and  wet  thermometers, 
Ji    =  the  height  of  the  barometer  in  English  inches  at  the  time  of  the  observation. 
When  the  readings  of  the  wet-bulb  thermometer  are  lelow  32°  Fahr.,  and  the  bulb 
is  covered  with  ice,  the  formula  becomes 

f  //  _  fi -  v  — 

J      —J  96  ^  30' 

The  factors  in  the  following  table,  which  is  taken  from  the  Greenwich  Observa- 
tions for  1843,  represent  ^  X  ^  and  ^  x  ^  computed  for  all  differences  between 
the  wet  and  dry  bulb'thermometers,  or  values  of  d,  from  0°  to  21°. 

USE  OF  THE  TABLE. 

To  find  out  the  force  of  vapor  in  the  air,  and  the  temperature  of  the  dew-point,  by 
means  of  these  factors,  let  the  factor  corresponding  to  d,  or  the  difference  between 
the  wet  and  dry  thermometer  in  the  first  column,  be  multiplied  into  the  observed 
height  of  the  barometer,  and  subtract  the  result  from  the  force  of  vapor,  in  Table 
XL,  due  to  the  temperature  of  evaporation,  indicated  by  the  wet-bulb  thermometer; 
the  rest  is  the  force  of  vapor  in  the  air  at  the  time  of  the  observation ;  and  the  tem- 
perature of  the  dew-point  is  that  which  is  due  to  it  in  Table  XL 

EXAMPLE. 
The  observation  gives, 

Dry-bulb  thermometer  =  79°  Fahr.,  or  the  temperature  of  the  air. 
Wet-bulb  "  =  69°      "      or  temperature  of  evaporation. 

Difference  TcF 

Height  of  barometer          29.7  English  inches. 

In  the  Table,  2d  part,  is  found,  —  factor  for  a  difference  of  10°  =  0.00379  X  29.7, 
or  height  of  barometer  =  0.113,  which,  subtracted  from  the  force  of  vapor  due  to 
69°,  in  Table  XL,  =  0.704  —  0.113,  gives  force  of  vapor  in  the  air  =  0.591  inches, 
and  temperature  of  the  dew-point  62°. 5. 

When  the  temperature  of  the  wet  bulb  is  below  32°  Fahrenheit,  the  factors  in  the 
first  part  of  the  Table  must  be  used. 

B  138 


XIII.     FACTOR  <|  X  jfi,  FOR  COMPUTING  THE  FORCE  OF  VAPOR  BY  APJOHN's  FORMULA, 
Below  320  Fahrenheit ;  the  Wet  Bulb  covered  with  a  Film  of  Ice. 


rf,  or 
Difference 
of  Wet  and 
Dry  Bulb 
Therm. 

o 
0 

Tenths  of  Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8.  ' 

9. 

0.00000 

0.00003 

0.00007 

0.00010 

0.00014 

0.00017 

0.00020 

0.00024 

0.00027 

0.00030 

1 

.00034 

.00037 

.00041 

.00044 

.00047 

.00051 

.00054 

.00058 

.00061 

.00064 

2 

.00068 

.00071 

.00075 

.00078 

.00081 

.00085 

.00088 

.00092 

.00095 

.00099 

3 

.00102 

.00105 

.00109 

.00112 

.00116 

.00119 

.00122 

.00126 

.00129 

.00133 

4 

.00136 

.00139 

.00143 

.00146 

.00150 

.00153 

.00156 

.00160 

.00163 

.00167 

5 

.00170 

.00173 

.00177 

.00180 

.00184 

.00187 

.00190 

.00194 

.00198 

.00201 

6 

.00204 

.00207 

.00211 

.00214 

.00218 

.00221 

.00224 

.00228 

.00231 

.00235 

7 

.00238 

.00241 

.00245 

.00248 

.00252 

.00255 

.00258 

.00262 

.00265 

.00269 

8 

.00272 

.00275 

.00279 

.00282 

.00285 

.00289 

.00292 

'.00296 

.00299 

.00302 

9 

.00306 

.00309 

.00313 

.00316 

.00319 

.00323 

.00326 

.00330 

.00333 

.00337 

10 

.00340 

.00343 

.00347 

.00350 

-00354 

.00357 

.00360 

.00364 

.00367 

.00370 

FACTOR  |X  I. 

• 

rf,  or 
Difference 
of  Wet  and 
Dry  Bulb 
Therm. 

Reading  of  Wet-Bulb  Thermometer  above  32&  Fahrenheit. 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 
0 

0.00000 

0.00004 

0.00008 

0.00011 

0.00015 

0.00019 

0.00023 

0.00027 

0.00030 

0.00034 

1 

.00038 

.00042 

.00046 

.00049 

.00053 

.00057 

.00061 

.00064 

.00068 

.00072 

2 

.00076 

.00080 

.00083 

.00087 

.00091 

.00095 

.00098 

.00102 

.00106 

.00110 

3 

.00114 

.00118 

.00121 

.00125 

.00129 

.00132 

.00137 

.00140 

.00144 

.00148 

4 

.00151 

.00135 

.00159 

.00163 

.00167 

.00171 

.00174 

.00178 

.00182 

.00186 

5 

.00189 

.00193 

.00197 

.00201 

.00205 

.00209 

.00212 

.00216 

.00220 

.00224 

6 

.00228 

.00231 

.00235 

.00239 

.00242 

.00246 

.00250 

.00254 

.00258 

.00261 

7 

.00265 

.00269 

.00273 

.00277 

.00280 

.00284 

.00288 

.00292 

.00295 

.00299 

8 

.00303 

.00307 

.00311 

.00315 

.00318 

.00322 

.00326 

.00330 

.00333 

.00337 

9 

.00341 

.00345 

.00349 

.00352 

.00356 

.00360 

.00364 

.00368 

.00371 

.00375 

10 

.00379 

.00383 

.00386 

.00390 

.00394 

.00398 

.00401 

.00405 

.00409 

.00412 

11 

.00416 

.00420 

.00424 

.00428 

.00432 

.00436 

.00439 

.00443 

.00447 

.00451 

12 

.00454 

.00458 

.  .00462 

.00466 

.00470 

.00474 

.00477 

.00481 

.00485 

.00489 

13 

.00493 

.00496 

'  .00500 

.00504 

.00508 

.00511 

.00515 

.00519 

.00522 

.00526 

14 

.00530 

.00534 

.00538 

.00541 

.00545 

.00549 

.00553 

.00556 

.00560 

.00564 

15 

.00568 

.00572 

.00576 

.00580 

.00584 

.00587 

.00591 

.00595 

.00598 

.00602 

16 

.00606 

.00610 

.00614 

.00618 

.00622 

.00625 

.00629 

.00633 

.00636 

.00640 

17 

.00644 

.00648 

.00652 

.00655 

.00659 

.00663 

.00666 

.00670 

.00674 

.00678 

18 

.00682 

.00686 

.00690 

.00693 

.00697 

.00701 

.00704 

.00708 

.00712 

.00716 

19 

.00720 

.00724 

.00728 

.00731 

.00735 

.00739 

.00742 

.00746 

.00750 

.00754 

20 

.00758 

.00761 

.00765 

.00769 

.00773 

.00777 

.00780 

.00784 

.00788 

.00792 

B 


139 


TABLE    XIV. 


IN  the  Greenwich  Magnetic  and  Meteorological  Observations  for  1842  and  1843, 
Mr.  Glaisher  discussed  the  relation  between  the  temperature  of  evaporation  given  by 
the  Wet-bulb  Thermometer  and  the  temperature  of  the  Devv-Point  as  given  by  Dan- 
iell's  H^rometer.  Comparing  the  observations  taken  simultaneously  every  six 
hours  with  the  Psychrometer,  and  with  Daniell's  Dew-Point  Hygrometer,  and  divid- 
ing the  average  difference  between  the  temperatures  of  the  Wet  and  Dry  bulb  by 
the  average  difference  of  the  temperature  of  the  Dew-Point  and  of  the  Air,  he  ob- 
tained the  empirical  factors  given  in  the  following  Table. 

The  observations  from  which  they  are  deduced  are  those  taken  at  the  Observatory 
in  the  years  1841  to  1845,  for  the  temperatures  below  35°  F.,  and  in  the  years  1841 
to  1843,  for  the  temperatures  above  35°  F. 

The  observations  made  at  Toronto  Observatory,  Canada  West,  in  similar  circum- 
stances, in  the  years  1840  to  1842,  were  also  compared  in  the  same  manner,  and 
the  factors  derived  from  them  showed  a  very  close  accordance  for  temperatures 
above  30°  F.,  but  were  tound  smaller  at  temperatures  below  30°  F. 

The  errors  in  the  temperature  of  the  Dew-Point,  which  may" result  by  using  the 
Greenwich  factors,  though  frequently  within  half  a  degree,  often  amount,  however, 
to  ±  2  or  3  degrees,  and,  in  extreme  cases,  to  ±  4  or  5  degrees,  as  shown  in  the 
volume  of  the  Greenwich  Observations  for  1842,  p.  60  of  the  Abstracts. 

Use  of  the  Table. 

Multiply  the  difference  between  the  Wet-bulb  and  Dry-bulb  Thermometers  by  the 
factor  standing  in  the  Table  opposite  the  reading  of  the  Dry-bulb,  and  subtract  the 
product  from  the  reading  of  the  Dry-bulb ;  the  remainder  will  be  the  temperature  of 
the  Dew-Point. 

Example.  —  Dry-bulb  =  62°  F. ;  Wet-bulb  =  55°  ;  Difference  =  7°. 

Opposite  62°,  in  the  first  column,  stands  the  factor  1.7,  which  multiplied  by  7°,  the 
difference,  gives  11°.9,  to  be  subtracted  from  the  Dry-bulb  ;  or  62°  —  11°.9  =  50°. 1, 
temperature  of  the  Dew-Point. 


XIV. 


FACTORS    TO    FIND    OUT    THE    TEMPERATURE    OF   THE    DEW-POINT    FROM    THE 
READINGS    OF    THE    PSYCHROMETER. GLAISHER. 


Dry-Bulb 
Therm. 
Fahren. 

Factors. 

Dry-Bulb 
Therm. 
Fahren. 

Factors. 

Dry-Bulb 
Therm. 
Fahren. 

Factors. 

Dry-Bulb 
Therm. 
Fahren. 

Factors. 

Dry-Bulb 
Therm. 
Fahren. 

Factors. 

21° 

8.5 

35° 

2.6 

49° 

2.2 

63° 

.7 

77° 

.5 

22 

8.5 

36 

2.6 

50 

2.1 

64 

.7 

78 

.5 

23 

8.5 

37 

2.5 

51 

2.1 

65 

.7 

79 

.5 

24 

7.3 

38 

2.5 

52 

2.0 

66 

.6 

80 

.5 

25 

6.4 

39 

2.5 

53 

2.0 

67 

.6 

81 

.5 

26 

6.1 

40 

2.4 

54 

2.0 

68 

.6 

82 

.5 

27 

5.9 

41 

2.4 

55 

2.0 

69 

.5 

83 

.5 

28 

5.7 

42 

2.4 

56 

1.9 

70 

.5 

84 

•5 

29 

5.0 

43 

2.4 

57 

1.9 

71 

.5 

85 

.5 

30 

4.6 

44 

2.3 

58 

1.9 

72 

.5 

86 

.5 

31 

3.6 

45 

2.3 

59 

1.8 

73 

.5 

87 

.5 

32 

3.1 

46 

2.3 

60 

1.8 

74 

.5 

88 

.5 

33 

2.8 

47 

2.2 

61 

1.8 

75 

.5 

89 

.5 

34 

2.6 

48 

2.2 

62 

1.7 

76 

.5 

90 

.5 

B 


140 


WEIGHT  OF  VAPOR,  IN   GRAINS  TROY,  CONTAINED  IN  A  CUBIC   FOOT  OF  SATURATED 
AIR,    AT    TEMPERATURES    BETWEEN    0°    AND    94°    FAHRENHEIT. 

From  the  Greenwich  Observations. 


r~ 

Temper- 
ature 

Weight 
of  Vapor. 

Temper- 
ature 

Weight 
of  Vapor, 

Temper- 
ature 

Weight 
of  Vapor, 

Temper- 
ature 

Weight 
of  Vapor, 

Temper- 
ature 

Weight 
of  Vapor, 

of  Air, 

in 

of  Air,            in 

of  Air, 

in 

of  Air, 

in 

of  Air, 

in 

Fahren. 

Grains. 

Fahren. 

Grains. 

Fahren. 

Grains. 

Fahren. 

Grains. 

Fahren. 

Grains. 

0° 

0.78 

19° 

1.52 

38° 

2.89 

57° 

5.34 

76° 

9.60 

1 

0.31 

20 

1.58 

39 

2.99 

58 

5.51 

77 

9.89 

2 

0.84 

21 

1.63 

40 

3.09 

59 

5.69 

78 

10.19 

3 

0.87 

22 

1.69 

41 

3.19 

60 

5.S7 

79 

10.50 

4 

0.90 

23 

1.75 

42 

3.30 

61 

6.06 

80 

10.81 

5 

0.93 

24 

1.81 

43 

3.41 

62 

6.25 

81 

11.14 

6 

0.97 

25 

1.87 

44 

3.52 

63 

6.45 

82 

11.47 

7 

.00 

26 

1.93 

45 

3.64 

64 

6.65 

83 

11.82 

8 

.04 

27 

2.00 

46 

3.76 

65 

6.87 

84 

12-17 

9 

.07 

28 

2.07 

47 

3.88 

66 

7.08 

85 

12.53 

10 

.11 

29 

2.14 

48 

4.01 

67 

7.30 

86 

12.91 

11 

.15 

30 

2.21 

49 

4.14 

68 

7.53 

87 

13.29 

12 

.19 

31 

2.29 

50 

4.28 

69 

7.76 

88 

13.68 

13 

.24 

32 

2.37 

51 

4.42 

70 

8.00 

89 

14.08 

14 

.28 

33 

2.45 

52 

4.56 

71 

8.25 

90 

14.50 

15 

.32 

34 

2.53 

53 

4.71 

72 

8.50 

91 

14.91 

16 

.37 

35 

2.62 

54 

4.86 

73 

8.76 

92 

15.33 

17 

.41 

36 

2.71 

55 

5.02 

74 

9.04 

93 

15.76 

18 

.47 

37 

2.80 

56 

5.18 

75 

9.31 

94 

16.22 

XVI.       FACTORS    TO    DEDUCE    THE    WEIGHT    OF    VAPOR    CONTAINED    IN    A    CUBIC 

FOOT    OF    AIR,    AT    THE    TIME    OF    A    GIVEN    OBSERVATION,    FROM    THE 

INDICATIONS    OF    DEW-POINT    INSTRUMENTS.  GREENW.  OfiS. 

t  =  Temperature  of  Air  ;  t'1  =  Temperature  of  Dew-Point. 

Difference 

Difference 

Difference 

Difference 

Difference 

or 

Factors. 

or 

Factors. 

or 

Factors. 

or 

Factors. 

or 

Factors. 

|    t-f. 

t  —  t". 

t  —  t". 

t  —  t". 

t  —  t". 

1 

0.999 

9 

0.982 

17 

0.966 

25 

0.951 

33 

0.935 

2 

0.996 

10 

0.980 

18 

0.964 

26 

0.949 

34 

0.934 

3 

0.994 

11 

0.978 

19 

0.962 

27 

0.947 

35 

0.932 

4 

0.992 

12 

0.976 

20 

0.960 

28 

0.945 

36 

0.930 

5 

0.990 

13 

0.974 

21 

0.958 

29 

0.943 

37 

0.929 

6 

0.988 

14 

0.972 

22 

0.956 

30 

0.942 

38 

0.927 

7 

0.986 

15 

0.970 

23 

0.954 

31 

0.939 

39 

0.925 

8 

0.984 

16 

0.968 

24 

0.952 

32 

0.937 

40 

0.923 

USE  OF  TABLE  XVI.  —  The  difference  between  the  temperatures  of  the  air 

and  of  the  Dew-Point  being  known,  multiply  the  factor  in  the  Table  corre- 

sponding to  that  difference  into  the  weight  of  a  cubic  foot  of  vapor  at  the 

temperature  of  the  Dew-Point,  as  given  in  Table  XV.,  and  the  product  will 

be  the  weight  of  vapor  in  a  cubic  foot  of  air  at  the  time  of  the  observation. 

Example.  —  Temperature  of  air  =  60°  F.  ;  Dew-Point  =  52°  ;  Diff.  =  8°. 

Table  gives  for  a  difference  of  8°,  factor  0.984  ;  Table  XV.  gives  weight 

of  a  cubic  foot  of  vapor  at  temperature  52°  —  4.gr<56. 

Hence,  0.984  X  4.56  —  4§r>.49,  the  weight  of  vapor  required. 

TABLE  XVII. 

FOR  COMPARING  THE  WEIGHT  OF  A  CUBIC  FOOT  OF  DRY  AND  OF  SATURATED  AIR. 

THIS  table  is  composed  of  two  tables  found  in  the  Greenwich  Meteorological 
Observations  for  1842,  pages  xlvi.  and  li. ;  the  first  containing  the  weight  of  a 
cubic  foot  of  dry  air,  under  a  barometric  pressure  of  30  inches,  at  temperatures  be- 
tween  0°  and  90°  F. ;  the  other  giving  the  weight  of  a  cubic  foot  of  saturated  air 
under  the  same  barometric  pressure  and  temperature,  together  with  the  excess  of  the 
first  above  the  last. 

The  weight  of  a  cubic  foot  of  dry  air,  on  which  the  tables  are  based,  is  assumed  to 
be  563  grains  Troy,  being  a  mean  value,  in  round  numbers,  between  the  determina- 
tions of  Shuckburgh,  which  is  557.7295  grains,  and  that  of  Biot  and  Arago,  568.7013. 
The  true  mean  is  563.2154,  but  563  is  the  number  used  in  the  calculations. 

The  coefficient  of  the  expansion  of  the  air  is  that  of  Gay-Lussac,  viz.  0.00375  for 
1°  Centigrade,  or  0.002083  of  its  bulk  for  1°  Fahrenheit. 

Use  of  the  Table. 

This  table  shows  the  amount  of  buoyancy  imparted  to  the  air  by  the  addition  of 
moisture  ;  and  from  it,  the  temperature  and  the  relative  humidity  of  the  air  being 
known,  the  weight  of  a  cubic  foot  of  air,  in  the  actual  condition  of  the  atmosphere  at 
the  time  of  an  observation,  can  be  deduced. 

It  suffices  to  take  in  the  fourth  column,  headed  "  Excess,"  the  quantity  corre- 
sponding to  the  temperature  of  the  air  in  the  first,  multiply  it  into  the  given  Relative 
Humidity,  and  subtract  the  product  from  the  number  in  the  second  column.  The 
result  will  be  the  weight  of  a  cubic  foot  of  air  at  the  existing  temperature  and 
moisture,  under  a  barometric  pressure  of  30  inches. 

This  result  will  be  reduced  to  its  true  value,  under  the  barometric  pressure  given 

Height  of  Barometer 
by  the  observation,  by  multiplying  it  by  -         — rr — 

Example. 

The  temperature  of  the  air  is  60°  F. ;  the  relative  humidity,  0.852  ;  the  barom- 
eter reads  29  inches. 

The  table  gives,  for  temperature  of  air,  60°  ;  excess,  3.35  X  0.852  =  2.85,  which, 
subtracted  from  531.91  in  the  second  column,  =  529.12,  weight  of  a  cubic  foot 

of  air  under  30  inches  of  pressure  ;  and  529.12  X  ^p  =  511.48,  the  weight  of 
a  cubic  foot  of  air  in  the  given  conditions  of  temperature,  moisture,  and  barometric 
pressure. 

B  142 


XVII.   FOR   COMPARING  THE  WEIGHT   OF  A  CUBIC  FOOT   OF  DRY 
AND   OF   SATURATED  AIR, 


From  the  Greenwich  Observations. 


Temper- 
ature 
Fahren. 

Weight 
fa  cubic 
foot  of 
Dry  Air. 

Weight 
of  a  cubic 
foot  of 
Saturat- 
ed Air. 

Excess 
of 
Dry  Air. 

Temper- 
ature 
Fahren. 

Weight 
of  a  cubic 
foot  of 
Dry  Air. 

Weight 
of  a  cubic 
foot  of 
Saturat- 
ed Air. 

Excess 
of 
Dry  Air. 

Temper- 
ature 
Fahren. 

Weight 
of  a  cubic 
foot  of 
Dry  Air 

Weight 
of  a  cubic 
foot  of 
Saturat- 
ed Air. 

Excess 
of 
Dry  Air. 

o 
0 

Grains. 
603.21 

Grains. 
602.77 

Grains 
0.44 

o 
30 

Grains. 
565.35 

Grains. 
564.08 

Grains. 
1.27 

o 
60 

Grains. 
531.97 

Grains. 
528.62 

Grains. 
3.35 

1 

601.87 

601.40 

0.47 

31  , 

564.17 

562.86 

1.31 

61 

530.93 

527.48 

3.45 

2 

600.52 

600.03 

0.49 

32 

563.00 

561.64 

1.36 

62 

529.88 

526.32 

3.56 

3 

599.20 

598.69 

0.51 

33 

561.84 

560.42 

1.42 

63 

528.84 

525.17 

3.67 

4 

597.87 

597.34 

0.53 

34 

560.67 

559.20 

1.47 

64 

527.81 

524.03 

3.78 

5 

596.55 

596.01 

0.54 

35 

559.51 

558.01 

1.50 

65 

526.88 

522.90 

3.88 

6 

595.24 

594.69 

0.55 

36 

558.35 

556.79 

1.56 

66 

525.76 

521.75 

4.01 

7 

593.94 

593.36 

0.58 

37 

557.21 

555.61 

1.60 

67 

524.75 

520.61 

4.14 

8 

592.63 

592.04 

0.59 

38 

556.05 

554.40 

1.65 

68 

523.72 

519.46 

4.26 

9 

591.33 

590.72 

0.61 

39 

554.91 

553.20 

1.71 

69 

522.70 

518.29 

4.41 

10 

590.04 

539.40 

0.64 

40 

553.77 

552.00 

1.77 

70 

521.70 

517.17 

4.53 

11 

583.75 

588.07 

0.68 

41 

552.65 

550.80 

1.84 

71 

520.70 

516.02 

4.68 

12 

537.43 

536.78 

0.70 

42 

551.52 

549.63 

1.89 

72 

519.69 

514.87 

4.82 

13 

586.21 

585.49 

0.72 

43 

550.39 

548.44 

1.95 

73 

518.70 

513.75 

4.95 

14 

584.94 

584.18 

0.75 

44 

549.27 

547.26 

2.01 

74 

517.70 

512.61 

5.09 

15 

583.67 

582.89 

0.78 

45 

548.16 

546.06 

2.10 

75 

516.71 

511.46 

5.25 

16 

532.41 

581.61 

0.80 

46 

547.05 

544.88 

2.17 

76 

515.73 

510.32 

5.41 

17 

581.15 

580.33 

0.82 

47 

545.97 

543.75 

2.22 

77 

514.74 

509.18 

5.56 

18 

579.91 

579.06 

0.85 

48 

544.85 

542.55 

2.30 

78 

513.77 

508.04 

5.73 

19 

573.67 

577.79 

0.88 

49 

543.75 

541.36 

2.39 

79 

512.80 

506.91 

5.89 

20 

577.44 

576.54 

0.90 

50 

542.65 

540.21 

2.44 

80 

511.82 

505.74 

6.08 

21 

576.21 

575.27 

0.94 

51 

541.55 

539.04 

2.51 

81 

510.87 

504.61 

6.26 

22 

574.93 

574.01 

0.97 

52 

540.48 

537.87 

2.61 

82 

509.89 

503.45 

6.44 

23 

573.76 

572.76 

1.00 

53 

539.41 

536.71 

2.70 

83 

508.93 

502.32 

6.61 

24 

572.55 

571.50 

1.05 

54 

538.33 

535.55 

2.78 

84 

507.97 

501.16 

6.81 

25 

571.33 

570.26 

1.07 

55 

537.27 

534.39 

2.88 

£5 

507.03 

500.05 

6.98 

26 

570.13 

569.01 

1.12 

56 

536.19 

533.22 

2.97 

86 

506.07 

498.87 

7.20 

27 

563.92 

567.77 

1.15 

57 

535.12 

532.06 

3.06 

87 

505.11 

497.71 

7.40 

28 

567.73 

566.53 

1.20 

58 

534.07 

530.92 

3.15 

88 

504.19 

496.58 

7.61 

29 

566.54 

565.31 

1.23 

59 

533.03 

529.77 

3.26 

89 

503.25 

495.44 

7.81 

30 

565.35 

564.08 

1.27 

60 

531.97 

528.62 

3.35 

90 

502.32 

494.28 

8.04 

B 


143 


MISCELLANEOUS     TABLES, 


COMPARING  THE  HYGROMETRICAL  RESULTS   OBTAINED  BY  DIFFERENT  AUTHORITIES. 


B  145 


MISCELLANEOUS    TABLES. 


THE  object  of  these  Tables  is  to  afford  the  means  of  comparing  the  different  deter- 
minations of  the  hygrometrical  elements  which  have  been  obtained,  or  adopted,  by 
various  physicists,  especially  the  values  of  the  elastic  forces  of  vapor  given  in  other 
tables  than  those  contained  in  the  preceding  pages. 

Table  XVIII. ,  giving  the  elastic  forces  of  vapor,  expressed  in  millimetres  of  mer- 
cury, for  Centigrade  temperatures,  was  calculated  by  August  from  Dalton's  experi- 
ments, and  reduced  to  French  measures  in  the  translation  of  Kaemtz's  Meteorology, 
by  Chas.  Martins,  page  70,  from  which  it  has  been  taken.  On  these  values  are  based 
the  first  psychrometrical  tables  published  by  August,  in  Berlin,  1825. 

Table  XIX.  is  the  table  computed  by  Kaemtz  from  his  own  experiments.  It  is 
found,  reduced  to  French  measures,  in  the  same  volume,  page  68. 

Table  XX.  furnishes  the  results  of  the  experiments  made  by  Professor  Magnus,  in 
Berlin,  and  published  in  Poggendorfs  Annalen,  Tom.  LXI.  p.  226,  and  also  in  the 
Annales  de  Chimie  et  de  Physique,  3me  serie,  Tom.  XII.  p.  88,  from  which  this  table 
was  copied. 

Table  XXI.  has  been  published  by  the  Committee  of  Physics  and  Meteorology  of 
the  Royal  Society,  in  their  Report  on  the  Objects  of  Scientific  Inquiry  in  these 
Sciences,  London,  1840,  p.  89.  The  values  which  it  contains  are  not  derived  from 
new  experiments,  but  are  probably  computed  from  those  existing  at  that  time. 

Table  XXII.  furnishes  a  synoptic  view  of  the  differences  in  the  values  of  the  force 
of  vapor  adopted  by  various  authorities,  prepared  with  the  view  of  facilitating  their 
comparison.  A  reference  to  their  respective  origin  will  be  found  below,  page  152. 

Table  XXIIL,  showing  the  weight,  in  grammes,  of  the  vapor  contained  in  a  cubic 
metre  of  saturated  air,  at  different  temperatures,  is  taken  from  Pouillet's  Elements  de 
Physique,  Tom.  II.  p.  707. 

Table  XXIV.  gives  the  weights  as  derived  from  August's  experiments,  in  Kaemtz's 
Vorlesungen  uber  Meteor  ologie.  The  table  is  copied  from  the  French  translation, 
by  Martins,  page  73.  The  tensions  have  been  added,  opposite  the  weights,  and  are 
extracted  from  August's  table. 

Table  XXV.  is  found  in  Biot's  Traite  de  Physique,  Tom.  I.  p.  533. 


B  147 


1 


XVIII.    ELASTIC  FOKCE  OF  AQUEOUS  VAPOK, 

EXPRESSED   IN  MILLIMETRES   OF  MERCURY   FOR  EVERY   TENTH   OF  A   CENTIGRADE   DEGREE. 

CALCULATED  BY  AUGUST. 


Tenths  of  Degrees. 

Centigrade 

Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Miliim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

-31 

0.45 

.0.45 

0.45 

0.44 

0.44 

0.43 

0.43 

0.42 

0.42 

0.41 

-30 

0.50 

0.49 

0.49 

0.48 

0.48 

0.47 

0.47 

0.46 

0.46 

0.45 

-29 

0.54 

0.54 

0.54 

0.53 

0.53 

0.52 

0.52 

0.51 

0.51 

0.50 

-23 

0.59 

0.58 

0.58 

0.57 

0.57 

0.56 

0.56 

0.55 

0.55 

0.54 

-27 

0.63 

0.63 

0.63 

0.62 

0.62 

0.61 

0.61 

0.60 

0.60 

0.59 

-26 

0.70 

0.69 

0.68 

0.68 

0.67 

0.66 

0.66 

0.65 

0.64 

0.64 

-25 

0.77 

0.76 

0.75 

0.75 

0.74 

0.73 

0.73 

0.72 

0.71 

0.71 

-24 

0.83 

0.83 

0.82 

0.82 

0.81 

0.80 

0.80 

0.79 

0.78 

0.78 

-23 

0.90 

0.89 

0.88 

0.88 

0.87 

0.86 

0.86 

0.85 

0.84 

0.84 

-22 

0.99 

0.98 

0.97 

0.96 

0.95 

0.95 

0.94 

0.93 

0.92 

0.91 

-21 

1.06 

1.05 

1.04 

1.04 

1.03 

1.02 

1.02 

1.01 

1.00 

1.00 

-20 

1.15 

1.14 

1.13 

1.12 

1.11 

1.11 

1.10 

1.09 

1.08 

1.07 

-19 

1.26 

1.25 

1.24 

1.23 

1.22 

1.21 

1.20 

1.18 

1.17 

1.16 

-18 

1.33 

1.32 

1.31 

1.31 

1.30 

1.29 

1.29 

1.28 

1.27 

1.27 

-17 

1.44 

1.43 

1.42 

1.41 

1.40 

1.39 

1.38 

1.36 

1.35 

1.34 

-16 

1.56 

1.54 

1.53 

1.52 

1.51 

1.50 

1.49 

1.47 

1.46 

1.45 

-15 

1.69 

1.68 

1.67 

1.65 

1.64 

1.63 

1.61 

1.60 

1.59 

1.57 

-14 

1.80 

1.79 

1.78 

1.77 

1.76 

1.75 

1.74 

1.72 

1.71 

1.70 

-13 

1.96 

1.94 

1.93 

1.91 

1.89 

1.88 

1.86 

1.85 

1.83 

1.82 

-12 

2.12 

2.10 

2.09 

2.07 

2.05 

2.04 

2.02 

2.01 

1.99 

1.98 

-11 

2.30 

2.28 

2.26 

2.25 

2.23 

2.21 

2.19 

2.17 

2.16 

2.14 

-10 

2.48 

2.46 

2.44 

2.43 

2.41 

2.39 

2.37 

2.35 

2.34 

2.32 

-  9 

2.66 

2.64 

2.62 

2.61 

2.59 

2.57 

2.55 

2.53 

2.52 

2.50 

-  8 

2.86 

2.84 

2.82 

2.80 

2.78 

2.76 

2.74 

2.72 

2.70 

2.68 

-  7 

3.09 

3.06 

3.04 

3.02 

3.00 

2.97 

2.95 

2.93 

2.91 

2.88 

-  6 

3.32 

3.29 

3.27 

3.25 

3.23 

3.20 

3.18 

3.16 

3.14 

3.11 

-  5 

3.56 

3.56 

3.54 

3.51 

3.48 

3.46 

3.43 

3.40 

3.37 

3.35 

-  4 

3.83 

3.80 

3.78 

3.75 

3.72 

3.70 

3.67 

3.64 

3.61 

3.59 

-  3 

4.11 

4.07 

4.05 

4.02 

3.99 

3.97 

3.94 

3.91 

3.88 

3.86 

-  2 

4.40 

4.37 

4.34 

4.32 

4.29 

4.26 

4.23 

4.20 

4.17 

4.14 

-  1 

4.71 

4.68 

4.65 

4.62 

4.59 

4.56 

4.53 

4.49 

4.46 

4.43 

-  0 

5.05 

5.01 

4.98 

4.95 

4.91 

4.88 

4.85 

4.81 

4.78 

4.74 

+  0 

5.05 

5.09 

5.12 

5.16 

5.19 

5.23 

5.27 

5.30 

5.34 

5.37 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

B 


148 


ELASTIC    FORCE    OF   AQUEOUS   VAPOR.  AUGUST. 


Tenths  of  Degrees. 

Centigrade 
Degrees. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

c 

1 

5.41 

5.45 

5.49 

5.52 

5.56 

5.60 

5.64 

5.68 

5.72 

5.75 

2 

5.80 

5.84 

5.88 

5.92 

5.96 

6.00 

6.04 

6.08 

6.13 

6.17 

3 

6.20 

6.24 

6.29 

6.33 

6.37 

6.41 

6.46 

6.50 

6.54 

6.59 

4 

6.63 

6.68 

6.72 

6.77 

6.81 

6.86 

6.90 

6.95 

6.99 

7.04 

5 

7.08 

7.13 

7.18 

7.23 

7.28 

7.33 

7.38 

7.43 

7.48 

7.53 

6 

7.58 

7.63 

7,68 

7.74 

7.79 

7.84 

7.89 

7.94 

7.99 

8.05 

7 

8.10 

8.15 

8.21 

8.26 

8.32 

8.37 

8.43 

8.48 

8.53 

8.59 

8 

8.64 

8.70 

8.76 

8.82 

8.87 

8.93 

8.99 

9.05 

9.11 

9.17 

9 

9.23 

9.30 

9.36 

9.43 

9.50 

9.57 

9.63 

9.70 

9.77 

9.84 

10 

9.90 

9.96 

10.02 

10.08 

10.14 

10.20 

10.25 

10.31 

10.37 

10.43 

11 

10.49 

10.56 

10.63 

10.69 

10.76 

10.83 

10.90 

10.96 

11.03 

11.10 

12 

11.17 

11.24 

11.31 

11.38 

11.45 

11.52 

11.59 

11.66 

11.73 

11.80 

13 

11.86 

11.94 

12.02 

12.10 

12.18 

12.26 

12.34 

12.42 

12.50 

12.58 

14 

12.66 

12.74 

12.82 

12.90 

12.98 

13.05 

13.13 

13.21 

13.29 

13.37 

15 

13.44 

13.52 

13.61 

13.69 

13.77 

13.86 

13.94 

14.02 

14.11 

14.19 

16 

14.28 

14.37 

14.47 

14.56 

14.65 

14.74 

14.84 

14.93 

15.02 

15.11 

17 

15.20 

15.29 

15.38 

15.46 

15.55 

15.64 

15.73 

15.82 

15.90 

15.99 

18 

16.08 

16.17 

16.27 

16.36 

16.45 

16.54 

16.64 

16.73 

16.82 

16.91 

19 

17.01 

17.13 

17.25 

17.37 

17.49 

17.61 

17.73 

17.85 

17.97 

18.09 

20 

18.20 

18.31 

18.43 

18.54 

18.65 

18.76 

18.88 

18.99 

19.10 

19.21 

21 

19.33 

19.45 

19.56 

19.68 

19.80 

19.92 

20.03 

20.15 

20.27 

20.39 

22 

20.51 

20.63 

20.76 

20.88 

21.01 

21.13 

21.25 

21.38 

21.50 

21.63 

23 

21.75 

21.88 

22.00 

22.13 

22.26 

22.38 

22.51 

22.63 

22.76 

22.89 

24 

23.01 

23.13 

23.24 

23.36 

23.48 

23.60 

23.71 

23.83 

23.95 

24.07 

25 

24.18 

24.34 

24.50 

24.67 

24.83 

24.99 

25.15 

25.32 

25.48 

25.64 

26 

25.81 

25.97 

26.13 

26.28 

26.44 

26.60 

26.76 

26.92 

27.07 

27.23 

27 

27.39 

27.55 

27.71 

27.86 

28.02 

28.18 

28.34 

28.50 

28.65 

28.81 

28 

28.96 

29.13 

29.29 

29.46 

29.63 

29.79 

29.96 

30.13 

30.30 

30.46 

29 

30.63 

30.81 

30.98 

31.16 

31.33 

31.51 

31.69 

31.86 

32.04 

32.21 

30 

32.39 

32.57 

32.76 

32.94 

33.13 

33.31 

33.50 

33.68 

33.87 

34.05 

31 

34.24 

34.43 

34.63 

34.82 

35.02 

35.21 

35.40 

35.60 

35.79 

35.99 

32 

36.18 

36.38 

36.59 

36.79 

36.99 

37.20 

37.40 

37.60 

37.80 

38.01 

33 

38.21 

38.43 

38.64 

38.86 

39.08 

39.29 

39.51 

39.73 

39.94 

40.16 

34 

40.38 

40.60 

40.82 

41.04 

41.26 

41.49 

41.71 

41.93 

42.15 

42.37 

35 

42.59 

42.82 

43.05 

43.28 

43.51 

43.74 

43.97 

44.20 

44.43 

44.66 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

B 


149 


XIX.  ELASTIC  FORCE  OF  AQUEOUS  VAPOR, 

EXPRESSED   IN   MILLIMETRES   OF   MERCURY,   FOR   CENTIGRADE   TEMPERATURES. 

Br  KAEMTZ. 


Temper- 
ature 
Centi- 
Grade. 

Force  of 
Vapor. 

Temper- 
ature 
Centi- 
grade. 

Force  of 
Vapor. 

Temper- 
ature 
Centi- 
grade. 

Force  of 
Vapor. 

Temper- 
ature 
Centi- 
grade. 

Force  of 
Vapor. 

Temper- 
ature 
Centi- 
grade. 

Force  of 
Vapor. 

0 

-25 

Millim. 
0.68 

0 

-12 

Millim. 
1.92 

o 
0 

Millim. 
4.58 

0 

12 

Millim. 
10.24 

o 
24 

Millim. 
21.43 

-24 

0.72 

-11 

2.05 

1 

4.92 

13 

10.91 

25 

22.74 

-23 

0.79 

-10 

2.21 

2 

5.26 

14 

11.62 

26 

24.16 

-22 

0.86 

-  9 

2.39 

3 

5.64 

15 

12.38 

27 

25.56 

-21 

0.92 

-  8 

2.57 

4 

6.01 

16 

13.17 

28 

27.07 

-20 

.01 

—  7 

2.78 

5 

6.45 

17 

14.03 

29 

28.67 

-19 

.10 

-  6 

2.98 

6 

6.90 

18 

14.93 

30 

30.36 

-18 

.20 

-  5 

3.20 

7 

7.38 

19 

15.86 

31 

32.17 

-17 

.29 

-  4 

3.45 

8 

7.89 

20 

16.87 

32 

33.95 

-16 

.40 

-  3 

3.70 

9 

8.41 

21 

17.91 

33 

35.95 

-15 

.51 

-  2 

3.97 

10 

9.00 

22 

19.04 

34 

37.99 

-14 

.62 

-  1 

4.26 

11 

9.58 

23 

20.21 

35 

40.15 

-13 

.76 

0 

4.58 

12 

10.24 

24 

21.43 

36 

42.40 

XX.    ELASTIC  FORCE   OF  AQUEOUS   VAPOR, 

EXPRESSED   IN   MILLIMETRES   OF   MERCURY,   FOR   CENTIGRADE    TEMPERATURES. 

BY  MAGNUS. 

Temper- 
ature 
Centi- 
grade. 

Force  of 
Vapor. 

Temper- 
ature 
Centi- 
grade. 

Force  of 
Vapor. 

Temper- 
ature 
Centi- 
grade. 

Force  of 
Vapor. 

Temper- 
ature 
Centi- 
grade. 

Force  of 
Vapor. 

Temper- 
ature 
Centi- 
grade. 

Force  of 
Vapor. 

o 

-20 

Millim. 
0.916 

o 
-7 

Millim. 
2.671 

o 
6 

Millim. 
6.939 

o 
19 

Millim. 
16.345 

o 
32 

Millim. 
35.419 

-19 

0.999 

-6 

2.886 

7 

7.436 

20 

17.396 

33 

37.473 

-18 

1.089 

-5 

3.115 

8 

7.964 

21 

18.505 

34 

39.630 

-17 

1.186 

-4 

3.361 

9 

8.525 

22 

19.675 

35 

41.893 

-16 

1.290 

-3 

3.624 

10 

9.126 

23 

20.909 

36 

44.268 

-15 

1.403 

_2 

3.905 

11 

9.751 

24 

22.211 

37 

46.758 

-14 

1.525 

-1 

4.205 

'     12 

10.421 

25 

23.582 

38 

49.368 

-13 

1.655 

0 

4.525 

13 

11.130 

26 

25.026 

39 

52.103 

-12 

1.796 

+1 

4.867 

14 

11.882 

27 

26.547 

40 

54.964 

-11 

1.947 

2 

5.231 

15 

12.677 

28 

28.148 

41 

57.969 

-10 

2.109 

3 

5.619 

16 

13.519 

29 

29.832 

42 

61.109 

-  9 

2.284 

4 

6.032 

17 

14.409 

30 

31.602 

43 

64.396 

-  8 

2.471 

5 

6.471 

18 

15.351 

31 

33.464 

44 

67.833 

B 


150 


XXL    ELASTIC  FORCE  OF  AQUEOUS  VAPOK, 

EXPRESSED   IN   ENGLISH   INCHES   OF   MERCURY,  FOR   TEMPERATURES   OF  FAHRENHEIT. 
From  the  Royal  Society's  Report. 


Temperature 

of 
Air. 

Force 
of 
Vapor. 

Temperature 
of 
Air. 

Force 
of 
Vapor. 

Temperature 
of 
Air. 

Force 
of 
Vapor. 

Temperature 
of 
Aii. 

Force 
of 

Vapor. 

Fahrenheit. 

Eng.  Inches. 

Fahrenheit. 

Eng.  Inches. 

Fahrenheit. 

Eng.  Inches. 

Fahrenheit. 

Eng.  Inches. 

0° 

0.051 

31° 

0.179 

62° 

0.551 

93° 

1.514 

1 

0.053 

32 

0.186 

63 

0.570 

94 

1.562 

2 

0.056 

33 

0.193 

64 

0.590 

95 

1.610 

3 

0.058 

34 

0.200 

65 

0.611 

96 

1.660 

4 

0.060 

35 

0.208 

66 

0.632 

97 

1.712 

5 

0.063 

36 

0.216 

37 

0.654 

98 

1.764 

6 

0.066 

37 

0.224 

68 

0.676 

99 

1.819 

7 

0.069 

38 

0.233 

69 

0.699 

100 

1.874 

8 

0.071 

39 

0.242 

70 

0.723 

101 

1.931 

9 

0.074 

40 

0.251 

71 

0.748 

102 

1.990 

10 

0.078 

41 

0.260 

72 

0.773 

103  • 

2.050 

11 

0.081 

42 

0.270 

73 

0.799 

104 

2.112 

12 

0.084 

43 

0.280 

74 

0.826 

105 

2.176 

13 

0.088 

44 

0.291 

75 

0.854 

106 

2.241 

14 

0.092 

45 

0.302 

76 

0.882 

107 

2.307 

15 

0.095 

46 

0.313 

77 

0.911 

108 

2.376 

16 

0.099 

47 

0.324 

78 

0.942 

109 

2.447 

17 

0.103 

48 

0.336 

79 

0:973 

110 

2.519 

18 

0.107 

49 

0.349 

80 

1.005 

111 

2.593 

19 

0.112 

50 

0.361 

81 

1.036 

112 

2.669 

20 

0.116 

51 

0.375 

82 

1.072 

113 

2.747 

21 

0.121 

52 

0.389 

83 

1.106 

114 

2.826 

22 

0.126 

53 

0.402 

84 

1.142 

115 

2.908 

23 

0.131 

54 

0.417 

85 

1.179 

116 

2.992 

24 

0.136 

55 

0.432 

86 

1.217 

117 

3.078 

25 

0.142 

56 

0.447 

87 

1.256 

118 

3.166 

26 

0.147 

57 

0.463 

88 

1.296 

119 

3.257 

27 

0.153 

58 

0.480 

89 

1.337 

120 

3.349 

28 

0.159 

59 

0.497 

90 

1.380 

121 

3.444 

29 

0.165 

60 

0.514 

91 

1.423 

122 

3.542 

30 

0.172 

61 

0.532 

92 

1.468 

123 

3.641 

31 

0.179 

62 

0.551 

93 

1.514 

124 

3.743 

B 


151 


TABLE  XXII. 


FOR  SHOWING  THE  DIFFERENCES  IN  THE  VALUES  OF  THE  ELASTIC  FORCE  OF 
AQUEOUS  VAPOR  ADOPTED  BY  DIFFERENT  AUTHORITIES. 


THE  following  synoptic  view  of  the  values  of  the  elastic  force  of  vapor  adopted  by 
various  authorities,  furnishes  the  means  of  readily  comparing  them,  and  of  appreci- 
ating the  amount  of  the  differences  which  they  exhibit.  The  values  are  given  both 
in  English  and  in  French  measures. 

Dalton's  values  are  copied  from  the  Edinburgh  Encyclopedia,  Art.  Hygrometry. 
Those  adopted  in  the  Greenwich  Observations  are  found  in  the  same  article,  and  also 
in  the  volumes  published  annually  by  that  Observatory.  Biot's  table  of  tensions  is, 
in  fact,  the  same,  computed  by  Pouillet  from  Dalton's  results,  by  Biot's  formula,  and 
published  in  Biot's  Traite  de  Physique,  Tom.  I.  p.  531.  Dr.  lire's  results  are  taken 
from  his  Memoir  in  the  Philosophical  Transactions  for  1818,  p.  347.  In  the  column 
headed  "  Daniell "  are  given  the  forces  of  vapor  as  found  in  the  table  published  in  his 
Meteorological  Essays,  2d  edition,  p.  596,  a  table  computed  by  Galbraith,  from  Dr. 
Ure's  experiments,  by  the  formula  of  Ivory. 

For  the  columns  headed  Royal  Society,  August,  Kaemtz,  Magnus,  and  Regnault, 
see  above,  p.  147. 


B  152 


XXII.    FOR  SHOWING  THE  DIFFERENCES  IN  THE  VALUES  OF  THE  ELASTIC 
FORCE  OF  AQUEOUS  VAPOR,  ADOPTED  BY  DIFFERENT  AUTHORITIES. 


FORCE    OF    VAPOR    EXPRESSED  IN  ENGLISH    INCHES    FOR   TEMPERATURES 
OF    FAHRENHEIT. 


Temper- 

Force of  Vapor  according  to 

Temper- 

ature 
of  Air, 

Green- 

ature 
of  Air, 

Fahren- 
heit. 

Dalton. 

wich 
Observa- 

Ure. 

Daniell. 

Royal 

Society. 

August. 

Kaemtz. 

Magnus. 

Regnault. 

Fahren- 
heit. 

tions. 

o 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

o 

0 

0.064 

0.061 

• 

0.068 

0.051 

0.053 

0.048 

0.044 

0.043 

0 

10 

0.090 

0.089 

.... 

0.098 

0.078 

0.082 

0.074 

0.070 

0.068 

10 

20 

0.129 

0.129 

.... 

0.140 

0.116 

0.124 

0.112 

0.108 

0.108 

20 

30 

0.186* 

0.186 

.... 

0.200 

0.172 

0.184 

0.166 

0.164 

0.167 

30 

32 

0.200 

0.199 

0.200 

0.216 

0.186 

0.199 

0.180 

0.178 

0.181 

32 

40 

0.263 

0.264 

0.250 

0.280 

0.251 

0.269 

0.244 

0.245 

0.248 

40 

50 

0.375 

0.373 

0.36& 

0.400 

0.361 

0.390 

0.354 

0.359 

0.361 

50 

60 

0.524 

0.523 

0.516 

0.560 

0.516 

0.547 

0.505 

0.517 

0.518 

60 

70 

0.721 

0.727 

0.726 

0.770 

0.723 

0.766 

0.710 

0.733 

0.733 

70 

80 

1.000 

1.001 

1.010 

1.060 

1.005 

1.058 

0.988 

1.025 

1.023 

80 

90 

1.360 

1.368 

1.360 

1.430 

1.380 

1.442 

1.354 

1.412 

1.410 

90 

95 

1.580 

1.594 

1.640 

1.636 

1.562 

1.677 

1.581 

1.649 

1.647 

95 

100 

1.860 

1.852 

l.RfiO 

1.874 

1.921 

1.918 

100 

FORCE    OF    VAPOR   EXPRESSED    IN    MILLIMETRES    FOR    CENTIGRADE 

TEMPERATURES. 

Temper- 

Force of  Vapor  according  to 

Temper- 

ature 

of  Air, 

Green- 

ature 
of  Air, 

Centi- 
grade. 

Dalton. 

wich 
Observa- 
tions. 

Blot. 

Daniell. 

Royal 
Society. 

August. 

Kaemtz. 

Magnus. 

Regnault. 

Centi- 
grade. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

o 

—20 

1.33 

1.15 

1.01 

0.91 

0.91 

—20 

-15            1.93 

1.88 

1.88 

2.11 

1.60 

1.69 

1.51 

1.40 

1.38 

2U 

-15 

-10 

2.64 

2.62 

2.63 

2.92 

2.34 

2.48 

2.21 

2.11 

2.08 

-10 

—  5 

3.66 

3.66 

3.66 

4.01 

3.33 

3.56 

3.20 

3.11 

3.13 

-  5 

0           5.08 

5.06 

5.06 

5.49 

4.72 

5.05 

4.58 

4.52 

4.60 

0 

+  5 

6.93 

6.95 

6.95 

7.42 

6.60 

7.08 

6.45 

6.47 

6.53 

+  5 

10 

9.52 

9.48 

9.47 

10.16 

9.17 

9.90 

9.00 

9.13 

9.16 

10 

15     |i   12.88 

12.85 

12.84 

13.79 

12.62 

13.44 

12.38 

12.68 

12.70 

15 

20         17.17 

17.30 

17.31 

18.34 

17.17 

18.20 

16.87 

17.40 

17.39 

20 

25    : 

23.11 

23.12 

23.09 

24.54 

23.14 

24.18 

22.74 

23.58 

23.55 

25 

30 

30.73 

30.70 

30.64 

32.33 

30.91 

32.39 

30.36 

31.60 

31.55 

30 

35 

40.13 

40.47 

40.40 

41.55 

40.89 

42.59 

40.15 

41.89 

41.83 

35 

40 

.... 

.... 

53.00 

.... 

53.64       .... 



54.96 

54.91 

40 

B 


153 


XXIII.     WEIGHT   OF  VAPOR,  IN  GRAMMES,    CONTAINED  IN  A  CUBIC    METRE    OF   SATURATED 
AIR,  AT    TEMPERATURES    BETWEEN    20°    AND    -]~40°    CENTIGRADE. POUILLET. 


Temper- 
ature of 
Dew-Point. 

Force 
of 
Vapor. 

Weight 
of 
Vapor. 

Temper- 
ature of 
Dew-Point. 

Force 
of 
Vapor. 

Weight 
of 
Vapor. 

Grammes. 
10.3 

Temper- 
ature of 
Dew-Point. 

Force 
of 
Vapor. 

Weight 
of 
Vapor. 

Centigrade. 
-20° 

Millim. 
1.3 

Grammes. 
1.5 

Centigrade. 
11° 

Millim. 
10.1 

Centigrade. 
26° 

Millim. 
24.4 

Grammes. 
23.8 

-15 

1.9 

2.1 

12 

10.7 

10.9 

27 

25.9 

25.1 

-10 

2.6 

2.9 

13 

11.4 

11.6 

28 

27.4 

26.4 

-  5 

3.7 

4.0 

14 

12.1 

12.2 

29 

29.0 

27.9 

0 

5.0 

5.4 

15 

12.8 

13.0 

30 

30.6 

29.4 

+  1 

5.4 

5.7 

16 

13.6 

13.7 

31 

32.4 

31.0 

2 

5.7 

6.1 

17 

14.5 

14.5 

32 

34.3 

32.6 

3 

6.1 

6.5 

18 

15.4 

15.3 

33 

36.2 

34.3 

4 

6.5 

6.9 

19 

16.3 

16.2 

34 

38.3 

36.2 

5 

6.9 

7.3 

20 

17.3 

17.1 

35 

40.4 

38.1 

6 

7.4 

7.7 

21 

18.3 

18.1 

36 

4f.T 

40.2 

7 

7.9 

8.2 

22 

19.4 

19.1 

37 

45.0 

42.2 

8 

8.4 

8.7 

23 

20.6 

20.2 

38 

47.6 

44.4 

9 

8.9 

9.2 

24 

21.8 

21.3 

39 

50.1 

46.7 

10 

9.5 

9.7 

25 

23.1 

22.5 

40 

53.0 

49.2 

XXIV.       WEIGHT    OF    VAPOR,    IN    GRAMMES,    CONTAINED  IN    A  CUBIC   METRE    OF   SATU- 
RATED AIR,  AT   TEMPERATURES    BETWEEN    25°    AND   -|~36°    CENTIGR.  KAEMTZ. 

Temper- 
ature of 
Dew-Point. 

Force 
of 
Vapor. 

Millim. 
0.77 

Weight 
of 
Vapor. 

Temper- 
ature of 
Dew-Point. 

Force 
of 
Vapor. 

Millim. 
3.83 

Weight 
of 
Vapor. 

Temper- 
ature of 
Dew-Point. 

Force 
of 
Vapor. 

Weight 
of 
Vapor. 

Centigrade. 
-25° 

Grammes. 
0.93 

Centigrade. 
-4° 

Grammes. 
4.37 

Centigrade. 
16° 

Millim. 
14.28 

Grammes. 
14.97 

-24 

0.83 

1.01 

-3 

4.11 

4.70 

17 

15.20 

15.84 

-23 

0.90 

1.10 

-2 

4.40 

5.01 

18 

16.08 

16.76 

-22 

0.99 

1.19 

-1 

4.71 

5.32 

19 

17.01 

17.75 

-21 

1.06 

1.26 

0 

5.05 

5.66 

20 

18.20 

'    18.77 

-20 

1.15 

1.38 

+1 

5.41 

6.00 

21 

19.33 

19.82 

-19 

.26 

1.47 

2 

5.80 

6.42 

22 

20.51 

20.91 

-18 

.33 

1.60 

3 

6.20 

6.84 

23 

21.75 

22.09 

-17 

.44 

1.74 

4 

6.63 

7.32 

24 

23.01 

23.36 

-16 

.56 

1.84 

5 

'7.08 

7.77 

25 

24.18 

24.61 

-15 

.69 

2.00 

6 

7.58 

8.25 

26 

25.81 

25.96 

-14 

.80 

2.14 

7 

8.10 

8.79 

26 

27.39 

27.34 

-13 

.96 

2.33 

8 

8.64 

9.30 

28 

28.96 

28.81 

-12 

2.12 

2.48 

9 

9.23 

9.86 

29 

30.63 

30.35 

-11 

2.30 

2.63 

10 

9.90 

10.57 

30 

32.39 

31.93 

-10 

2.48 

2.87 

11 

10.49 

11.18 

31 

34.24 

33.65 

-  9 

2.66 

3.08 

12 

11.17 

11.S3 

32 

36.18 

35.45 

-  8 

2.86 

3.30 

13 

11.86 

12.57 

33 

38.21 

37.20 

-  7 

3.09 

3.53 

14 

12.66 

13.33 

34 

40.38 

39.12 

-  6 

3.32 

3.80 

15 

13.44 

14.17 

35 

42.59 

41.13 

-  5 

3.56 

4.08 

16 

14.28 

14.97 

36 

44.96 

43.17 

B 


154 


XXV.    FORCES  OF  VAPOR  AND  RELATIVE  HUMIDITY, 


CORRESPONDING    TO    THE    DEGREES    OF    SAUSSURE's   HAIR-HYGROMETER,   AT   THE 
TEMPERATURE    OF    10°    CENTIGRADE. 

From  the  Experiments  of  Gay-Lussac. 
The  force  of  vapor  is  expressed  in  hundredths,  the  tension  at  full  saturation  being  represented  by  100. 


Degrees  of 
Hair-Hy- 
grometer. 

Force 
of 
Vapor. 

Relative 
Humidity 
in  Thou- 
sandths. 

Degrees  of 
Hair-Hy- 
grometer. 

Force 
of 
Vapor. 

Relative 
Humidity 
in  Thou- 
sandths. 

Degrees  of 
Hair-Hy- 
grometer. 

Force 
of 
Vapor. 

Relative 
Humidity 
in  Thou- 
sandths. 

o 
0 

0.00 

0.000 

o 
34 

17.10 

o 
67 

43.73 

1 

0.45 

35 

17.68 

0.177 

68 

44.89 

2 

0.90 

36 

18.30 

69 

46.04 

3 

1.35 

37 

18.92 

70 

47.19 

0.472 

4 

1.80 

38 

19.54 

71 

48.51 

5 

2.25 

0.022 

39 

20.16 

72 

49.82 

0.500 

6 

2.71 

40 

20.78 

0.208 

73 

51.14 

7 

3.18 

41 

21.45 

74 

52.45 

8 

3.64 

42 

22.12 

75 

53.76 

0.538 

9 

4.10 

43 

22.79 

76 

55.25 

10 

4.57 

0.046 

44 

23.46 

77 

56.74 

11 

5.05 

45 

24.13 

0.241 

78 

58.24 

12 

5.52 

46 

24.86 

79 

59.73 

13 

6.00 

47 

25.59 

80 

61.22 

0.612 

14 

6.48 

48 

26.32 

81 

62.89 

15 

6.96 

0.070 

49 

27.06 

82 

64.57 

16 

7.46 

50 

27.79 

0.278 

83 

66.24 

17 

7.95 

51 

28.58 

84 

67.92 

18 

8.45 

52 

29.38 

85 

69.59 

0.696 

19 

8.95 

53 

30.17 

86 

71.49 

20 

9.45 

0.094 

54 

30.97 

87 

73.39 

21 

9.97 

55 

31.76 

0.318 

88 

75.29 

22 

10.49 

56 

32.66 

89 

77.19 

23 

11.01 

57 

33.57 

90 

79.09 

0.791 

24 

11.53 

58 

34.47 

91 

81.09 

25 

12.05 

0.120 

59 

35.37 

92 

83.08 

26 

12.59 

60 

36.28 

0.363 

93 

85.08 

27 

13.14 

61 

37.31 

94 

87.07 

28 

13.69 

62 

38.34 

95 

89.06 

0.891 

29 

14.23 

63 

39.36 

96 

91.25 

30 

14.78 

0.148 

64 

40.39 

• 

97 

93.44 

31 

15.36 

65 

41.42 

0.414 

98 

95.63 

32 

15.94 

66 

42.58 

99 

97.81 

33 

16.52 

67 

43.73 

100 

100.00 

1.000 

B 


155 


XXVI. 

TABLE 

FOR 

DEDUCING   THE   RELATIVE  HUMIDITY   IN  HUNDREDTHS,  FROM   THE  INDICATIONS  OF 
SAUSSURE'S  HAIR-HYGROMETER  ; 

Calculated  from  the  Experiments  of  Melloni. 
BY  M.  T.  HAEGHENS. 


THE  Hair-Hygrometer  of  Saussure  having  been  formerly  used  for  long  series 
of  observations,  and  being  still  employed  by  some  meteorologists,  notwithstanding 
the  imperfection  of  this  instrument,  on  account  of  its  giving  directly  the  relative 
humidity  without  calculation,  it  was  desirable  to  ascertain  the  correspondence  of  the 
degrees  of  that  hygrometer  with  the  relative  humidity  expressed  in  hundredths,  as  in 
the  preceding  table.  Though  these  instruments  compared  with  each  other,  show 
very  often  great  discrepancies  in  their  indications,  yet  a  large  number  of  them  agree 
sufficiently  well  with  the  experiments  of  Melloni,  August,  and  others,  to  allow  the 
following  table  of  comparison  to  be  constructed,  which  table  may  be  considered  as 
giving  good  approximations.  For  the  calculation  of  it,  Mr.  Haeghens  used  the  results 
of  Melloni,  which  agree  also  satisfactorily  with  a  series  of  observations  very  care- 
fully made  by  M.  Delcros.  See  Annuaire  Meteor  ologique  de  la  France,  pour  1850. 


RELATIVE    HUMIDITY   IN   HUNDREDTHS. 


Degrees  of 
Saussure's 
Hygrome- 

Degrees of  Saussure's  Hygrometer. 

Units. 

ter. 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

V. 

8. 

9. 

Humidity 

Humidity 

Humidity 

Humidity 

Humidity 

Humidity 

Humidity 

Humidity 

Humidity 

Humidity 

O 

0 

0 

1 

1 

2 

3 

3 

4 

4 

5 

1 

5 

6 

6 

7 

8 

8 

9 

10 

11 

11 

2 

12 

12 

13 

14 

15 

16 

17 

18 

18 

19 

3 

19 

20 

21 

22 

23 

24 

24 

25 

26 

26 

4 

27 

27 

28 

28 

29 

30 

31 

32 

33 

34 

5 

35 

36 

37 

37 

38 

39 

40 

41 

42 

43 

6 

44 

45 

46 

47 

49 

50 

51 

52 

53 

55 

7 

56 

57 

58 

59 

61 

62 

63 

65 

66 

68 

8 

69 

70 

72 

73 

75 

77 

78 

79 

81 

82 

9 

83 

85 

87 

88 

9t 

91 

93 

95 

97 

98 

10 

100 

• 

• 

• 

• 

• 

• 

• 

• 

• 

B 


156 


TABLE     XXVII. 


THE  following  Table  shows  the  Relative  Humidity,  in  hundredths,  corresponding 
to  the  degrees  of  Saussure's  Hair-Hygrometer,  as  determined  by  various  physicists. 
It  is  found  in  Kaemtz,  Vorlesungen  uber  Meteorologie,  page  100  ;  also  in  the  French 
translation  by  Martins,  Cours  de  Meteorologie,  page  80. 


XXVI.       RELATIVE    HUMIDITY,    CORRESPONDING    TO    THE    DEGREES    OF    SAUSSURE  S 

HAIR-HYGROMETER. 

Saturation  =  100. 


Degrees 
of 

Hair- 
Hygrometer. 

Relative  Humidity  according  to 

Degrees 
of 
Hair- 
Hygrometer. 

Gay-Lussac. 

Prinsep. 

August. 

Melloni. 

100° 

100.0 

100.0 

100.0 

100.0 

100° 

95 

89.1 

88.7 

94.0 

90.8 

95 

90 

79.1 

78.2 

86.0 

83.1 

90 

85 

69.6 

68.3 

79.0 

76.5 

85 

80 

61.2 

59.2 

71.0 

68.9 

80 

75 

53.8 

50.6 

64.0 

62.0 

75 

70 

47.2 

43.6 

56.0 

55.6 

70 

65 

41.4 

37.2 

48.0 

49.6 

65 

€0 

36.3 

31.5 

41.0 

44.0 

60 

55 

31.8 

26.3 

36.0 

39.1 

55 

50 

27.8 

21.8 

31.0 

34.6 

50 

45 

24.1 

17.7 

27.0 

29.8 

45 

40 

20.8 

14.3 

23.0 

27.0 

40 

35 

17.7 

11.4 

19.0 

23.8 

35 

30 

14.8 

9.1 

16.0 

19.0 

30 

25 

12.0 

7.1 

13.0 

16.4 

25 

20 

9.4 

4.9 

10.0 

11.7 

20 

15 

7.0 

3.0 

7.0 

8.3 

15 

10 

4.6 

1.6 

4.0 

5.0 

10 

5 

2.2 

0.6 

2.0 

2.6 

5 

0 

0.0 

0.0 

0.0 

0.0 

0 

B 


157 


APPENDIX 


TO 


THE    HYGROMETRICAL   TABLES 


B  159 


TABLES 


COMPARING   THE    QUANTITIES    OF   RAIN-WATER. 


THE  three  kinds  of  measures  which  are  most  in  use  for  noting  the  quantities  of 
rain  and  melted  snow,  are  the  Centimetres  and  Millimetres  in  France,  the  Paris  or 
French  inches  and  lines  in  Germany,  and  the  English  inches  and  decimals  in  Eng- 
land, America,  and  also  in  Russia,  the  Russian  foot  being  the  same  as  the  English 
foot.  The  following  tables  will  facilitate  the  comparison  of  these  various  measures 
with  each  other. 

A  glance  at  the  tables  will  show  that  the  first  column  on  the  left  contains  the 
numbers  to  be  converted,  and  the  heads  of  the  following  columns  the  fractions  of 
these  numbers,  or  units,  each  of  which  is  one  tenth  of  those  in  the  first  column. 
Shorter  tables,  at  the  bottom,  give,  when  necessary,  the  value  of  proportional  parts 
still  smaller  than  those  found  in  the  larger  tables. 

Example. 

Let  13  Centimetres  be  converted  into  French  inches  and  lines. 

Take,  in  Table  II.,  the  line  beginning  with  10  Centimetres  in  the  first  column,  fol- 
low that  line  as  far  as  the  column  headed  3  Centimetres,  and  there  will  be  found  the 
number  of  4  inches  9.63  lines,  which  is  the  corresponding  value  in  French  inches  of 
10  -|-  3,  or  13  Centimetres. 

If  the  number  is  followed  by  a  fraction,  as  for  instance,  13.5  Centimetres,  or  135 
Millimetres,  we  find,  — 

French  Inches.  Lines. 

In  the  larger  table  13  .    Centimetres  =4  .9,63 

In  the  smaller  table  at  the  bottom       5  Millimetres   =      .2,216 

Or  13^5  Centimetres  =  4.11,846 

When  the  measures  which  are  to  be  compared  are  both  subdivided  into  decimal 
parts,  the  equivalents  of  the  numbers  greater  than  9.9  may  be  found  by  moving  the 
decimal  point. 

Example. 

Let  346.7  Centimetres  be  converted  into  English  inches. 
In  Table  I.,  in  the  column  headed  4,  on  the  fourth  line, 

we  find  3.4  Centimetres  =  1.3386  English  inches. 

Moving  the  decimal  point  by  two  places  we  have 

340       Centimetres  —  133.86  English  inches. 
Then,  in  the  column  headed  7,  on  the 

line  beginning  with  6,  we  find  6.7  Centimetres  =      2.64 

Making  together  346.7  Centimetres  =  136.50  English  inches. 

B  161 


I.   CONVERSION    OF    CENTIMETRES    INTO    ENGLISH    INCHES   AND    DECIMALS. 


1  Centimetre  =  0.3937079  English  Inch. 


Millimetres. 

metres. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Eng.Inch. 

Eng.Inch 

Eng.Inch 

Eng.Inch 

Eng.Inch 

Eng.Inch 

Eng.Inch. 

Eng.Inch. 

Eng.Inch 

Eng.Inch. 

0 

0.0000 

0.0394 

0.0787 

0.1181 

0.1575 

0.1969 

0.2362 

0.2756 

0.3150 

0  3543 

1 

0.3937 

0.4331 

0.4724 

0.5118 

0.5512 

0.5906 

0.6299 

O.G693 

0.7087 

0.7480 

2 

0.7874 

0.8268 

0.8662 

0.9055 

0.9449 

0.9843 

1.0236 

1.0630 

1.1024 

1.1418 

3 

1.1811 

1.2205 

1.2599 

1.2992 

1.3386 

1.3780 

1.4173 

1.4567 

1.4961 

1.5355 

4 

1.5748 

1.6142 

1.6536 

1.6929 

1.7323 

1.7717 

1.8111 

1.8504 

1.8898 

1.9292 

5 

1.9685 

2.0079 

2.0473 

2.0867 

2.1260 

2.1654 

2-2048 

2.2441 

2.2835 

2.3229 

6 

2.3622 

2.4016 

2.4410 

2.4804 

2.5197 

2.5591 

2-5985 

2.6378 

2.6772 

2.7166 

7 

2.7560 

2.7953 

2.S347 

2.8741 

2.9134 

2.9528 

2.9922 

3.0316 

3.0709 

3.1103 

8 

3.1497 

3.1890 

3.2284 

3.2678 

3.3071 

3.3465 

3.3859 

3.4253 

3.4646 

3.5040 

9 

3.5434 

3.5827 

3.6221 

3.6615 

3.7009 

3.7402 

3.7796 

3.8190 

3.8583 

3.8977 

II.  CONVERSION    OF    CENTIMETRES    INTO    FRENCp    INCHES,    LINES,    AND    DECIMALS. 

1  Centimetre  =  0.  inches  4.43296  Paris  lines. 

Unit* 

metres. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Fr.In.Lin. 

Fr.In.Lin  F 

r.In.  Lin.  I 

Yin.  Lin.  I 

Yin.  Lin. 

Fr.In.Lin.  Fr.In.Lin. 

Fr.In.  Lin. 

Fr.In.Lin. 

Fr.In.  Lin. 

0 

0.  0,00 

0.  4,43 

0.  8,87 

1.  1,30 

1.  5,73 

1.10,16 

2.  2,60 

2.  7,03 

2.11,46 

3.  3,90 

10 

3.  8,33 

4.  0,76 

4.  5,20 

4.  9,63 

5.  2,06 

5.  6,49 

5.10,93 

6.  3,36 

6.  7,79 

7.  0,23 

20 

7.  4,66 

7.  9,09 

8.  1,53 

8.  5,96 

8.10,39 

9.  2,82 

9.  7,26 

9.11,69 

10.  4,12 

10.  8,56 

30 

11.  0,99 

11.  5,42  1 

1.  9,85  1 

2.  2,29] 

2.  6,72 

12.11,15 

13.  3,5913.  8,02 

14.  0,45 

14.  4,89 

40 

14.  9,32 

15.  1,751 

5.  6,18  1 

5.10,62  ] 

6.  3,05 

16.  7,48 

16.11,9217.  4,35 

17.  8,78 

18.  1,22 

50 

18.  5,65 

18.10,08  1 

9.  2,51  1 

9.  6,951 

9.11,38 

JO.  3,81 

20.  8,25  21.  0,68 

21.  5,11 

21.  9,54 

60 

22.  1,98 

22.  6,41  2 

2.10,84  5 

3.  3,2823.  7,71 

J4.  0,14 

24.  4,5824.  9,01 

25.   1,44 

25.  5,87 

70 

25.10,31 

26.  2,742 

6.  7,175 

6.11,6127.  4,04 

57.  8,4728.  0,9028.  5,34 

28.  9,77 

29.  2,20 

80 
90 

29.  6,64 
33.  2,97 

29.11,073 
33.  7,403 

0.  3,502 
3.11,83? 

0.  7,9331.  0,37 
4.  4,2634.  8,70 

11.  4,8031.  9,2332.   1,67 
J5.  1,1335.  5,5635.10,00 

32.  6,10 
36.  2,43 

32.10,53 
36    6,86 

Centim. 

Yin.  Lin. 

Centim.   F 

r.In.  Lin. 

Centim. 

Yin.  Lin.  11  Centim. 

Yin.  Lin. 

Centim. 

Fr.In.Lin. 

100 

36.11,30 

200      7 

3.10.59 

300     |110.9,89||     400 

147.9,18 

500 

184.8,48 

CONVERSION    OF    CENTIMETRES    INTO    FRENCH    LINES    AND    DECIMALS. 

Units. 

•Centi- 

metres. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

0 

0.00 

4.43 

8.87 

13.30 

17.73 

22.16 

26.60 

31.03 

35.46 

39.90 

10 

44.33 

48.76 

53.20 

57.63 

62.06 

66.49 

70.93 

75.36 

79.79 

84.23 

20 

88.66 

93.09 

97.53 

101.96 

106.39 

110.82 

115.26 

119.69 

124.12 

128.56 

30 

132.99 

137.42 

141.85 

146.29 

150.72 

155.15 

159.59 

164.02 

168.45 

172.89 

40 

177-32 

181.75 

186.18 

190.62 

195.05 

199.48 

203.92 

208.35 

212.78 

217.22 

50 

221.65 

226.08 

230.51 

234.95 

239.38 

243.81 

248.25 

252.68 

257.11 

261.54 

60 

265.98 

270.41 

274.84 

279.28 

283.71 

288.14 

292.58 

297.01 

301.44 

305.87 

70 

310.31 

314.74 

319.17 

323.61 

328.04 

332.47 

336.90 

341.34 

345.77 

350.20 

80 

354.64 

359.07 

363.50 

367.93 

372.37 

376.80 

381.23 

385.67 

390.10 

394.53 

90 

398.97 

403.40 

407.83 

412.26 

416.70 

421.13 

425.56 

430.00 

434.43 

438.86 

CONVERSION    OF    MILLIMETRES    INTO    FRENCH    LINES    AND    DECIMALS. 

II    o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

(" 
Fr.  Line 

s. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

Fr.  Lines. 

0.0. 

0.443 

0.887 

1.330       1.773 

2.216 

2.660 

3.103 

3.546 

3.990 

162 


III.    CONVERSION    OF    ENGLISH    INCHES    INTO    CENTIMETRES. 


1  English  Inch  =  2.53995  Centimetres. 


Units. 

English 
Inches. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Centim. 

Centim. 

Centim 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

0 

0.00 

2.54 

5.08 

7.62 

10.16 

12.70 

15.24 

17.78 

20.32 

22.86 

10 

25.40 

27.94 

30.48 

33.02 

35.56 

38.10 

40.64 

43.18 

45.72 

48.26 

20 

50.80 

53.34 

55.88 

58.42 

60.96 

63.50 

66.04 

68.58 

71.12 

73.66 

30 

76.20 

78.74 

81.28 

83.82 

86.36 

88.90 

91.44 

93.98 

96.52 

99.06 

40 

101.60 

104.14 

106.68 

109.22 

111.76 

114.30 

116.81 

119.38 

121.92 

124.46 

50 

127.00 

129.54 

132.08 

134.62 

137.16 

139.70 

142.24 

144.78 

147.32 

149.86 

60 

152.40 

154.94 

157.48 

160.02 

162.56 

165.10 

167.64 

170.18 

172.72 

175.26 

70 

177.80 

180.34 

182.88 

185.42 

187.96 

190.50 

193.04 

195.58 

198.12 

200.66 

80 

203.20 

205.74 

208.28 

210.82 

213.36 

215.90 

218.44 

220.98 

223.52 

226.06 

90 

228.60 

231.14 

233.68 

236.22 

238.76 

241.30 

243.84 

246.38 

248.92 

251.46 

100 

254.00 

256.54 

259.08 

261.62 

264.16 

266.70 

269.24 

271.78 

274.32 

276.85 

110 

279.39 

281.93 

284.47 

287.01 

289.55 

292.09 

294.63 

297.17 

299.71 

302.25 

120 

304.79 

307.33 

309.87 

312.41 

314.95 

317.49 

320.03 

322.57 

325.11 

327.65 

130 

330.19 

332.73 

335.27 

337.81 

340.35 

342.89 

345.43 

347.97 

350.51 

353.05 

140 

355.59 

358.13 

360.67 

363.21 

365.75 

368.29 

370.83 

373.37 

375.91 

378.45 

150 

380.99  - 

383.53 

386.07 

388.61 

391.15 

393.69 

396.23 

398.77 

401.31 

403.85 

160 

406.39 

408.93 

411.47 

414.01 

416.55 

419.09 

421.63 

424.17 

426.71 

429.25 

170 

431.79 

434.33 

436.87 

439.41 

441.95 

444.49 

447-03 

449.57 

452.11 

454.65 

180 

457.19 

459.73 

462.27 

464.81 

467.35 

469.89 

472.43 

474.97 

477.51 

480.05 

190 

482-59 

485.13 

487.67 

490.21 

492.75 

495.29 

497.83 

500.37 

502.91 

505.45 

200 

507.99 

510.53 

513.07 

515.61 

518.15 

520.69 

523.23 

525.77 

528.31 

530.85 

Tenths  of  an  Inch. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Centim. 

Centim. 

Centim 

Centim. 

Cenlim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

0.000 

0.254 

0.508 

0.762 

1.016 

1.270 

1.524 

1.778 

2.032 

2.286 

IV.    CONVERSION 

OF    ENGLISH    INCHES    INTO    FRENCH    INCHES    AND    LINES. 

1  English  lnch  =  0.  inches  11.2595  Paris  lines. 

Units. 

Inches. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Fr.In.  Lin.  JFr.In.  Lin. 

Fr.In.  Lin. 

Fr.Iu.Lin.  F 

r.  It  i.Lin. 

Y.In.Lin.  1 

Yin.  Lin. 

Fr.In.  Lin. 

Fr.In.Lin. 

Fr.In.  Lin. 

0 

0.  0,00 

0.11,26 

1.10,52 

2.  9,78    3.  9,04 

4.  8,30 

5.  7,56 

6.  6,82 

7.  6,08 

8.  5,34 

10 

9.  4,59 

10.  3,85 

11.  3,11 

12.  2,3713.   1,63 

14.  0,8915.  0,15 

15.11,41 

16.10,67 

17.  9,93 

20 

18.  9,1919.  8,45 

20.  7,71 

21.  6,97.22.  6,23 

J3.  5,4924.  4,75 

25.  4,01 

26.  3,27 

27.  2,53 

30 

28.  1,7829.  1,04 

30.  0,30 

30-11,5631.10,82 

52.10,0833.  9,3434.  8,60 

35.  7,86 

36.  7,12 

40 

37.  6,3838.  5,64 

39.  4,90 

40.  4,1641.  3,42 

12.  2,68 

13.  1,9444.   1,20 

45.  0,46 

45.11,72 

50 

46.10,9747.10,2348.  9,49 

49.  8,7550.  8,01 

51.  7,2752.  6,53 

53.  5,79 

54.  5,05 

55.  4,31 

60 

55.  3,57,57.  2,8358.  2,0959.  1,3560.  0,61 

50.11,87  61.  11,13  62.10,39 

63.  9,65 

64.  8,91 

70 

65.  8,16|66.  7,4267.  6,6868.  5,9469.  5,20 

rO.  4,4671.  3,7272.  2,98 

73.  2,24 

74.  1,50 

80 

75.  0,7676.  0,0276.11,2877.10,5478.  9,80 

r9.  9,0680.  8,3281.  7,58 

82.  6,84 

83.  6,10 

90 

34.  5,3585.  4,61 

86.  3,8787.  3,1388.  2,39 

J9.  1,6590.  0,9^91.  0,17 

91.11,4392.10,69 

Eng.  Inch. 

Fr.In.Lin. 

Eng.Inch. 

Fr.In.  Lin. 

ing.  Inch. 

Yin.  Lin 

Eng.Inch.  IFr.In.  Lin. 

Eng.Inch. 

Fr.In.Lin. 

100 

93.9,95  | 

200 

187.7,90 

300 

J81.5,85 

400     (375.3,80 

500 

469.1,75 

Tenths  of  an  Inch. 

0. 

i.  |   *. 

3. 

4. 

5. 

6. 

•7. 

8. 

9. 

Fr.In.Lin. 

Fr.In.Lin. 

Fr.In.  Lin. 

Fr.In.Lin.  F 

r.In.Lin.  E 

Yin.  Lin.  I 

Yin.  Lin. 

Fr.In.  Lin. 

Fr.In.  Lin. 

Fr.In.  Lin. 

0.0,00 

0.1,13 

0.2,25 

0.3,38 

0.4,50 

0.5,63 

0.6,76 

0.7,88      0.9,01 

0.10,13 

B 


163 


V.    CONVERSION    OF    FRENCH    INCHES    INTO    CENTIMETRES. 
1  French  Inch  =  2.7070  Centimetres. 


Units. 

French 

Inches. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

S. 

9. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

0 

0.00 

2.71 

5.41 

8.12 

10.83 

13.53 

16.24 

18.95 

21.66 

24.36 

10 

27.07 

29.78 

32.48 

35.19 

37.90 

40.60 

43.31 

46.02 

48.73 

51.43 

20 

54.14 

56.85 

59.55 

62.26 

64.97 

67.67 

70.38 

73.09 

75.80 

78.50 

30 

81.21 

83.92 

86.62 

89.33 

92.04 

94.74 

97.45 

100.16 

102.87 

105.57 

40 

108.28 

110.99 

113.69 

116.40 

119.11 

121.81 

124.52 

127.23 

129.94 

132.64 

50 

135.35 

138.06 

140.76 

143.47 

146.18 

148.88 

151.59 

154.30 

157.01 

159.71 

60 

162.42 

165.13 

167.83 

170.54 

172.25 

175.95 

178.66 

181.37 

184.08 

186.78 

70 

189.49 

192.20 

194.90 

197.61 

200.32 

203.02 

205.73 

208.44 

211.15 

213.85 

80 

216.56 

219.27 

221.97 

224.68 

227.39 

230.09 

232.80 

235.51 

238.22 

240.92 

90 

243.63 

246.34 

249.04 

251.75 

254.46 

257.16 

259.87 

262.58 

265.29 

267.99 

100 

270.70 

273.41 

276.11 

278.82 

281.53 

284.23 

286.94 

289.65 

292.36 

295.06 

110 

297.77 

300.48 

303.18 

305.89 

308.60 

311.30 

314.01 

316.72 

319.42 

322.13 

120 

324.84 

327.55 

330.25 

332.96 

335.67 

338.37 

341.08 

343.79 

346.49 

349.20 

130 

351.91 

354.62 

357.32 

360.03 

362.74 

365.44 

368.15 

370.86 

373.56 

376.27 

140 

378.98 

381.69 

384.39 

387.10 

389.81 

392.51 

395.22 

397.93- 

400.63 

403.34 

150 

406.05 

408.76 

411.46 

414.17 

416.88 

419.58 

422.29 

425.00 

427.70 

430.41 

160 

433.12 

435.83 

438.53 

441.24 

443.95 

446.65 

449.36 

452.07 

454.77 

457.48 

170 

460.19 

462.90 

465.60 

468.31 

471.02 

473.72 

476.43 

479.14 

481.84 

484.55 

180 

487.26 

489.97 

492.67 

495.38 

498.09 

500.79 

503.50 

506.21 

508.91 

511.62 

190 

514.33 

517.04 

519.74 

522.45 

525.16 

527.86 

530.57 

533.28 

535.98 

538.69 

200 

541.40 

544.11 

546.81 

549.52 

552.23 

554.93 

557.64 

560.35 

563.05 

565.76 

CONVERSION    OF    FRENCH    LINES    INTO    CENTIMETRES. 

1  French  Line  =  0.22558  Centimetre. 

Tenths  of  a  Line. 

French 

Lines. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

Centim. 

0 

0.000 

0.023 

0.045 

0.068 

0.090 

0.113 

0.135 

0.158 

0.180 

0.203 

1 

0.226 

0.248 

0.271 

0.293 

0.316 

0.338 

0.361 

0.383 

0.406 

0.429 

2 

0.451 

0.474 

0.496 

0.519 

0.541 

0.564 

0.587 

0.609 

0.632 

0.654 

3 

0.677 

0.699 

0.722 

0.744 

0.767 

0.790 

0.812 

0.835 

0.857 

0.880 

4 

0.902 

0.925 

0.947 

0.970 

0.993 

1.015 

1.038 

1.060 

1.083 

1.105 

5 

1.128 

1.150 

1.173 

1.196 

1.218 

1.241 

1.263 

1.286 

1.308 

1.331 

6 

1.353 

1.376 

1.399 

1.421 

1.444 

1.466 

1.489 

1.511 

1.534 

1.557 

7 

1.579 

1.602 

1.624 

1.647 

1.669 

1.692 

1.714 

1.737 

1.760 

1.782 

8 

1.805 

1.827 

1.850 

1.872 

1.895 

1.917 

1.940 

1.963 

1.985 

2.008 

9 

2.030 

2.053 

2.075 

2.098 

2.120 

2.143 

2.166 

2.188 

2.211 

2.233 

10 

2.256 

2.278 

2.301 

2.324 

2.346 

2.369 

2.391 

2.414 

2.436 

2.459 

11 

2.481 

2.504 

2.527 

2.549 

2.572 

2.594 

2.617 

2.639 

2.662 

2.684 

12 

2.707 

2.730 

2.752 

2.775 

2.797 

2.820 

2.842 

2.865 

2.887 

2.910 

B 


164 


VI.    CONVERSION  OF  FRENCH  INCHES  INTO  ENGLISH  INCHES  AND  DECIMALS. 


1  French  Inch  =  1.065765  Enslish  Inch. 


French 
Inches. 

Units. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Eng  Inch. 
0.000 

Eng.Inch. 
1.066 

Eng.Inch 
2.132 

Eng.Inch.  Eng.Inch 
3.197      4.263 

Eng.Inch 
5.329 

Eng.Inch. 
6.395 

Eng.Inch 
7.460 

.Eng.Inch 
8.526 

Eng.Inch. 
9.592 

10 

10.658 

11.723 

!    12.789 

13.855    14.921 

15.986 

17.052 

18.118 

19.184 

20.250 

20 

21.315 

22.381 

23.447 

24.513    25.578 

26.644 

27.710 

28.776 

29.841 

30.907 

30 
40 

31.973 
42.631 

33.039 
'  43.696 

34.104 
44.762 

35.170    36.236 
45.828    46.894 

37.302 
47.959 

38.368 
49.025 

39.433 
50.091 

40.499 
51.157 

41.565 
52.222 

50 

53.288 

54.354 

55.420 

56.486 

57.551 

58.617 

59.683 

60.749 

61.814 

62.880 

60 

63.946 

65.012 

66.077 

67.143 

68.209 

69.275     70.340    71.407 

72.472 

73.538 

70 

74.604 

75.669 

76.735 

77.801 

78.867 

79.932    80.998    82.064 

83.130 

84.195 

80 

85.261 

86.327 

87.393 

88.458 

89.524 

90.590 

91.656 

92.722 

93.787 

94.853 

90 

95.919 

96.985 

98.050 

99.116  100.182 

101.248 

102.314 

103.379 

104.445 

105.511 

100 

106.576 

107.642 

108.708 

109.774 

110.840 

111.905 

112.971 

114.037 

115.103 

116.168 

110 

117.234 

118.300 

119.366 

120.431 

121.497 

122.563 

123.629 

124.695 

125.760 

126.826 

120 

127.892 

128.958 

130.023 

131.089  132.155 

133.221 

134.286 

135.352  136.418  137.484 

130 

138.549 

139.615 

140.681 

141.747  142.813 

143.878 

144.944 

146.010  147.076 

148.141 

140 

149.207 

150.273 

151.339 

152.404!153.470 

154.536 

155.602 

156.667 

157.733 

158.799 

150 

159.865 

160.931 

161.996 

163.062  164.128 

165.194 

166.259 

167.325 

168.391 

169.457 

160 
170 

170.522 
181.180 

171.588 
182.246 

172.654 
183.312 

173.720 
184.377 

174.785 
185.443 

175.851 
186.509 

176.917 
187.575 

177.983 
188.640 

179.049 
189.706 

180.114 
190.772 

180 
190 

191.838 
202.495 

192.903 
203.561 

193.969 
204.627 

195.035196.101 
205.693206.758 

197.167  198.232  199.298 
207.824  208.890  209.956 

200.364 
211.021 

201.430 
212X)87 

200        213.153 

214.219 

215.285 

216.350217.416 

218.482  219.548  220.613 

221.679  222.745 

CONVERSION    OF    FRENCH    LINES    INTO    ENGLISH    INCHES. 

1  French  Line  =  0.088814  English  Inch. 

French 
Lines. 

Tenths  of  a  Line. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Eng.lnch. 
0.0000 

Eng.Inch. 
0.0089 

Eng.Inch. 
0.0178 

Eng.Inch. 
0.0266 

Eng  Inch. 
0.0355 

Eng.Inch. 
0.0444 

Eng  Inch. 
0.0533 

Eng.Inch. 
0.0622 

Eng.Inch. 
0.0711 

Eng  Inch. 
0.0799 

1 

0.0388 

0.0977 

0.1066 

0.1155 

0.1243 

0.1332 

0.1421 

0.1510 

0.1599 

0.1687 

2 

0.1776 

0.1865 

0.1954 

0.2043 

0.2132 

0.2220 

0.2309 

0.2398 

0.2487 

0.2576 

3 

0.2664 

0.2753 

0.2842 

0.2931 

0.3020 

0.3108 

0.3197 

0.3286 

0.3375 

0.3464 

4 

0.3553 

0.3641 

0.3730 

0.3819 

0.3908 

0.3997 

0.4085 

0.4174 

0.4263 

0.4352 

5 

0.4441 

0.4530 

0.4618 

0.4707 

0-4796 

0.4885 

0.4974 

0.5062 

0.5151 

0.5240 

6 

0.5329 

0.5418 

0.5506 

0.5595 

0.5684 

0.5773 

0.5862 

0.5951 

0.6039 

0.6128 

7 

0.6217 

0.6306 

0.6395    0.6J83 

0.6572 

0.6661 

0.6750 

0.6839 

0.6927 

0.7016 

8 

0.7105 

0.7194 

07283 

0.7372 

0.7460 

0.7549 

0.7638 

0.7727 

0.7816 

0.7904 

9 

0.7993 

0.8082 

0.8171 

0.8260 

0.8349 

0.8437 

0.8526 

0.8615 

0.8704 

0.8793 

10 

0.8881 

0.8970 

0.9059 

0.9148 

0.9237 

0.9325 

0.9414 

0.9503 

0.9592 

0.9681 

11 

12 

i 

0.9770 
1.0658 

0.9858 
1.0746 

0.9947 
1.0835 

1.0036 
1.0924 

1.0125 
1.1013 

1.0214 
1.1102 

1.0302 
1.1191 

1.0391 
1.1279 

1.0480 
1.1368 

1.0569 
1.1457 

B 


165 


METEOROLOGICAL    TABLES 


III. 


BAROMETKICAL    TABLES. 


CONTENTS. 


(The  figures  refer  to  the  folio  at  the  bottom  of  the  page.) 

For  Comparing  the  different  Barometrical  Scales. 

TABLE       I.  Comparison  of  the  English  and  the  Metrical  Barometers        .  .11 

"  II.  Comparison  of  the  English  and  the  Old  French  Barometers  .         15 

"  III.  Comparison  of  the  Metrical  and  the  English  Barometers        .  .21 

"  IV.  Comparison  of  the  Metrical  and  the  Old  French  Barometers  .         27 

"  V.  Comparison  of  the  Old  French  and  the  English  Barometers  .     35 

"  VI.  Comparison  of  the  Old  French  and  the  Metrical  Barometers  „         39 

"  VII.  Comparison  of  the  Russian  and  the  Metrical  Barometers        .  .     46 

"  VIII.  Comparison  of  the  Russian  and  the  Old  French  Barometers  .         48 

For  Comparing  Barometrical  Differences. 

"  IX.  Conversion  of  English  Inches  into  Millimetres       .         .  .         .53 

"  X.  Conversion  of  English  Inches  into  French  or  Paris  Lines  .         53 

"  XI.  Conversion  of  Millimetres  into  English  Inches       .         .  .         .54 

"  XII.  Conversion  of  Millimetres  into  French  or  Paris  Lines  .         .         55 

"  XIII.  Conversion  of  French  or  Paris  Lines  into  Millimetres  .         .     56 

"  XIV.  Conversion  of  French  or  Paris  Lines  into  English  Inches  .         56 

"  XV.  Conversion  of  Russian  Half-Lines  into  Millimetres         .  .         .57 

"  XVI.  Conversion  of  Russian  Half-Lines  into  Paris  Lines  .         .         57 

For  Reducing  Barometrical  Observations  to  tlie  Freezing  Point. 

"  XVII.  Reduction  of  English  Barometers  with  Brass  Scales       .         .  .65 

"  XVIII.  Reduction  of  English  Barometers  with  Glass,  or  Wooden  Scales  72 

"  XIX.  Reduction  of  the  Metrical  Barometer,  by  Delcros  .     73 

"  XX.  Reduction  of  the  Metrical  Barometer,  by  Haeghens            .         .  81 

"  XXI.  Reduction  of  the  Old  French  Barometer,  by  Kaemtz     .         .  .   124 

For  Correcting  Barometrical  Observations  for  Capillary  Action. 

"  XXII.  Correction  to  be  applied  to  English  Barometers  for  Capillary  Action  131 
"  XXIII.  Normal  Height  of  Meniscus  in  Millimetres,  by  Delcros  .  .  131 
"  XXIV.  Correction  to  be  applied  to  Metrical  Barometers  for  Capillary  Action, 

by  Delcros 132 

"    XXV.     Depression  of  the  Barometrical  Column  due  to  Capillary  Action.  — 

Pouillet .133 

"  XXVI.     Depression  of  the  Barometrical  Column  due  to  Capillary  Action.  — 

Gehler's  Worterb.       .  133 

"  XXVII.     Depression  of  the  Barometrical  Column  due  to  Capillary  Action, 

reduced  from  Delcros's  Table    .  ...       134 

14  XXVIII.    Depression  of  the  Barometrical  Column  due  to  Capillary  Action.  — 

Baily 134 

C  3 


COMPARISON 


OF 


THE    BAROMETRICAL    SCALES, 


TABLES 


FOR    CONVERTING    THE    INDICATIONS    OF    THE    ENGLISH,   METRICAL,    OLD    FRENCH, 
AND    RUSSIAN    BAROMETERS    INTO    EACH    OTHER. 


COMPARISON 


OP 


THE    BAEOMETBIC AL    SCALES 


THE  following  tables  are  intended  for  converting  into  each  other  the  four  most 
important  Barometrical  Scales.  They  are  sufficiently  detailed  to  save  the  labor  of 
any  calculation  or  even  of  interpolation  for  the  ordinary  wants  of  Meteorology.  But 
before  making  use  of  them,  for  comparing  the  observations  taken  with  barometers  of 
different  scales,  it  is  necessary  to  reduce  the  observed  heights  to  the  temperature 
of  the  freezing  point,  or  to  any  other  temperature,  provided  it  be  the  same  for  all, 
by  means  of  the  tables  calculated  for  this  purpose,  and  which  will  be  found  below. 
The  reason  of  it  may  be  readily  understood. 

The  length  of  the  bars  of  metal,  or  of  other  substances,  which  represent  the  stand- 
ard measures  of  length  which  obtain  among  different  nations,  varying  with  the  tem- 
perature, it  was  necessary  to  determine  a  fixed  point  of  temperature  at  which  they 
really  ought  to  have  the  length  adopted  as  the  standard  unit  of  measure.  This 
temperature  is  the  normal  temperature  of  the  standard,  and  the  length  of  the  stand- 
ard-bar, at  this  temperature,  is  the  true  length  of  it. 

If  the  normal  temperature  of  the  various  standards  used  for  dividing  Barometrical 
Scales  were  the  same,  the  heights  of  the  barometrical  column,  taken  with  these 
scales,  could  be  compared  directly,  provided  the  scales  be  made  of  the  same  sub- 
stance, brass,  for  instance,  because  their  variations  above  or  below  this  normal  tem- 
perature would  remain  parallel  with  each  other.  But  unfortunately  it  is  not  so. 
The  English  Yard  is  a  standard  at  the  temperature  of  62°  Fahrenheit ;  the  Old 
French  Toise,  at  13°  Reaumur ;  the  Metre,  at  the  freezing  point,  or  zero  Centigrade. 
Thus  metallic  rods  intended  to  represent  these  various  units  of  measure  give  the  true 
or  standard  length  only  when  at  these  respective  temperatures  ;  at  any  other  tem- 
perature they  are  longer  or  shorter  than  the  standard,  and  their  subdivisions,  inches, 
lines,  or  millimetres,  partake  of  the  error. 

It  is  obvious,  therefore,  that  the  barometrical  heights,  taken  with  different  scales, 
cannot  be  compared  directly  by  means  of  the  following  tables,  which  give  the  re- 
lation between  these  scales  at  their  respective  normal  temperatures.  For  suppose 
the  temperature  of  the  three  barometers  to  be  the  freezing  point,  or  32°  Fahrenheit, 

C  7 


COMPARISON    OF    THE    BAROMETRICAL    SCALES. 

the  scale  of  the  Metrical  Barometer  alone  will  actually  represent  the  standard  length, 
and  the  millimeters  will  have  the  true  length ;  while  the  inches  and  lines  of  the  Old 
French  and  of  the  English  Barometers  will  be  too  short,  causing  thus  the  barometrical 
column  to  appear  too  high.  If  the  temperature  of  the  instruments  be  62°  Fahrenheit, 
the  divisions  of  the  English  Barometer  will  have  the  true  standard  length,  and  those 
of  the  Old  French  Barometer  nearly  so  ;  but  the  millimeters  of  the  Metrical  Barome- 
ter will  be  too  long,  causing  the  barometrical  column  to  appear  too  low.  It  is  to 
neutralize  the  effect  of  those  inequalities  arising  from  the  expansion  of  the  scale, 
that  it  is  necessary,  before  comparing  the  observations  taken  with  the  three  barome- 
ters, to  reduce  them  to  the  same  temperature.  This  is  done  by  means  of  the  tables 
above  mentioned,  for  reducing  the  barometer  to  the  freezing  point,  which  suppose 
the  scales  to  be  of  brass  from  top  to  bottom,  and  which  take  into  account  the  expan- 
sion or  -contraction  they  undergo  by  the  variations  of  temperature. 

But  in  doing  so,  we  must  be  aware  that  the  accuracy  of  the  comparison  depends 
in  part  upon  the  correctness  of  the  indications  of  the  attached  thermometers,  which 
determine  the  amount  of  the  correction  to  be  applied  for  reducing  the  barometers  to 
the  freezing  point.  If  the  thermometers  do  not  agree,  an  error  is  introduced  which  will 
affect  the  height  of  the  reduced  columns,  and  the  final  comparison.  Therefore  the 
correction  of  the  attached  thermometers  ought  to  be  ascertained  and  applied  to  them 
before  the  reduction  is  made  ;  or  if  this  correction  is  unknown,  it  will  be  well  to  place 
the  instruments  to  be  compared  in  the  most  favorable  conditions  for  taking  the  same 
temperature,  and  then  to  take  the  temperature  given  by  one  of  the  thermometers  to 
reduce  both  barometers.  If  the  correction  of  the  attached  thermometer  has  not  been 
applied  before  the  reduction,  it  will  be  contained,  after  the  reduction,  in  the  total  cor- 
rection of  the  instrument.  If  it  be  so,  this  circumstance  must  be  indicated. 

In  computing  the  following  tables,  the  value  of  the  Metre,  as  determined  by  Capt. 
Kater,  (Philosoph.  Transact,  for  1818,  p.  109,  and  Baily's  Astronomical  Tables,  p. 
192,)  has  been  adopted,  viz.  1  Metre,  at  0°  Centigrade  =  39.37079  English  inches, 
at  62°  Fahrenheit.  The  relation  of  the  Metre  (legal)  to  the  Old  French  system  of 
measures  is  known  to  be  1  Metre  =  443.296  French  or  Paris  lines.  From  these 
equations  are  derived  the  elements  used  in  the  computations,  which  are  found  at  the 
head  of  each  table. 

Besides  the  larger  Tables  I. -VIII.,  a  set  of  smaller  ones,  Tables  IX. -XVI.,  has 
been  added,  which  will  be  found  useful  for  comparing  Barometrical  differences,  such 
as  ranges,  amount  of  variation  in  a  given  time,  &c.,  expressed  in  measures  of  differ- 
ent scales,  in  which  only  small  quantities  occur  that  are  not  found  in  the  large  tables. 


I.  -II. 

COMPARISON 


OF 


THE    ENGLISH    BAROMETER 


WITH 


THE   METRICAL  AND   THE   OLD   FRENCH   BAROMETERS, 


OR 


TABLES 

FOR  CONVERTING  ENGLISH  INCHES  INTO  MILLIMETRES,  AND   INTO  FRENCH  OR 
PARIS   LINES   AND   DECIMALS  ; 

GIVING    THE    VALUES    CORRESPONDING    TO    EVERY    TENTH   OF  AN   INCH,  FROM   9 

TO    19    INCHES  ;    AND    TO    EVERY   HUNDREDTH,   FROM 

19  TO   31.5   ENGLISH   INCHES. 


c 


USE     OF    TABLE    I. 

Example. 

THE  English  Barometer  reads  20.657  inches.    What  would  be  the  corresponding  , 
height  in  the  Metrical  Barometer  ? 

In  Table  I.,  first  column  on  the  left,  look  out  the  line  of  20  inches  6  tenths ;  on 
that  line,  in  the  sixth  column,  headed  5  hundredths,  is  found  the  value  in  milli- 
metres for 

20.65    inches  =  524.50  millimetres. 

At  the  bottom  of  the  page,  for    0.007      "      =      0.18         " 
Or  for  20.657      " =  524.68 

which  would  be  the  reading  of  the  Metrical  Barometer. 

This  example  may  serve  for  all  tables,  throughout  the  volume,  which  are  constructed 
on  the  same  plan. 


10 


I.    COMPARISON    OF    THE    ENGLISH   AND    METRICAL    BAROMETERS. 
1  English  Inch  =  25.39954  Millimetres. 


•C'1-  _!•  -L 

Tenths  of  an  Inch. 

tnglisn 
laches. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

9 

228.60 

231.14 

233.68 

236.22 

238.76 

241.30 

243.84 

246.38 

248.92 

251.46 

10 

254.00 

256.54 

259.08 

261.62 

264.16 

266.70 

269.24 

271.78 

274.32 

276.85 

11 

279.39 

281.93 

284.47 

287.01 

289.55 

292.09 

294.63 

297.17 

299.71 

302.25 

12 

304.79 

307.33 

309.87 

312.41 

314.95 

317.49 

320.03 

322.57 

325.11 

327.65 

13 

330.19 

332.73 

335.27 

337.81 

340.35 

342.89 

345.43 

347.97 

350.51 

353.05 

14 

355.59 

358.13 

360.67 

363.21 

365.75 

368.29 

370.83 

373.37 

375.91 

378.45 

15 

380.99 

383.53 

386.07 

388.61 

391.15 

393.69 

396.23 

398.77 

401.31 

403.85 

16 

406.39 

408.93 

411.47 

414.01 

416.55 

419.09 

421.63 

424.17 

426.71 

429.25 

17 

431.79 

434.33 

436.87 

439.41 

441.95 

444.49 

447.03 

449.57 

452.11 

454.65 

18 

457.19 

459.73 

462.27 

464.81 

467.35 

469.89 

472.43 

474.97 

477.51 

480.05 

Hundredtha  of  an  Inch. 

English 

filches  ctrid 

tenths. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

19.0 

482.59 

482.85 

483.10 

483.35 

483.61 

483.86 

484.12 

484.37 

484.62 

484.88 

1 

485.13 

485.39 

485.64 

485.89 

486.15 

486.40 

486.66 

486.91 

487.16 

487.42 

2 

487.67 

487.93 

488.18 

488.43 

488.69 

488.94 

489.20 

489.45 

489.70 

489.96 

3 

490.21 

490.47 

490.72 

490.97 

491.23 

491.48 

491.74 

491.99 

492.24 

492.50 

4 

492.75 

493.01 

493.26 

493.51 

493.77 

494.02 

494.28 

494.53 

494.78 

495.04 

5 

495.29 

495.55 

495.80 

496.05 

496.31 

496.56 

496.81 

497.07 

497.32 

497.58 

6 

497.83 

498.08 

498.34 

498.59 

498.85 

499.10 

499.35 

499.61 

499.86 

500.12 

7 

500.37 

500.62 

500.88 

501.13 

501.39 

501.64 

501.89 

502.15 

502.40 

502.66 

8 

502.91 

503.16 

503.42 

503.67 

503.93 

504.18 

504.43 

504.69 

504.94 

505.20 

9 

505.45 

505.70 

505.96 

506.21 

506.47 

506.72 

506.97 

507.23 

507.48 

507.74 

20.0 

507.99 

508.24 

508.50 

508.75 

509.01 

509.26 

509.51 

509.77 

510.02 

510.28 

1 

510.53 

510.78 

511.04 

511.29 

511.55 

511.80 

512.05 

512.31 

512.56 

512.82 

2 

513.07 

513.32 

513.58 

513.83 

514.09 

514.34 

514.59 

514.85 

515.10 

515.36 

3 

515.61 

515.86 

516.12 

516.37 

516.63 

516.88 

517.13 

517.39 

517.64 

517.90 

4 

518.15 

518.40 

518.66 

518.91 

519.17 

519.42 

519.67 

519.93 

520.18 

520.44 

5 

520.69 

520.94 

521.20 

521.45 

521.71 

521.96 

522.21 

522.47 

522.72 

522.98 

6 

523.23 

523.48 

523.74 

523.99 

524.25 

524.50 

524.75 

525.01 

525.26 

525.52 

7 

525.77 

526.02 

526.28 

526.53 

526,79 

527.04 

527.29 

527.55 

527.80 

528.06 

8 

528.31 

528.56 

528.82 

529.07 

529.33 

529.58 

529.83 

530.09 

530.34 

530.60 

9 

530.85 

531.10 

531.36 

531.61 

531.87 

532.12 

532.37 

532.63 

532.88 

533.14 

Thousandths  of  an  Inch. 

0. 

1. 

2.     3.     4.     5.     6.     7. 

8. 

9. 

0.0 

0.03 

0.05    0.08    0.10    0.13    0.15     0.18 

0.20 

0.23 

11 


COMPARISON    OF    THE    ENGLISH   AND    METRICAL    BAROMETERS. 


Hundredths  of  an  Inch. 

English 

Inches  an 
tenths. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Millim 

Millim. 

Millim. 

Millim. 

Millim 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

21.0 

533.39 

533.64 

533.90 

534.15 

534.41 

534.66 

534.91 

535.17 

535.42 

535.68 

1 

535.93 

536.18 

536.44 

536.69 

536.95 

537.20 

537.45 

537.71 

537.96 

538.22 

2 

538.47 

538.72 

538.98 

539.23 

539.49 

539.74 

539.99 

540.25 

540.50 

540.76 

3 

541.01 

541.26 

541.52 

541.77 

542.03 

542.28 

542.53 

542.79 

543.04 

543.30 

4 

543.55 

543.80 

544.06 

544.31 

544.57 

544.82 

545.07 

545.33 

545.58 

545.84 

5 

546.09 

546.34 

546.60 

546.85 

547.11 

547.36 

547.61 

547.87 

548.12 

548.38 

6 

548.63 

548.88 

549.14 

549.39 

549.65 

549.90 

550.15 

550.41 

550.66 

550.92 

7 

551.17 

551.42 

551.68 

551.93 

552.19 

552.44 

552.69 

552.95 

553.20 

553.46 

8 

553.71 

553.96 

554.22 

554.47 

554.73 

554.98 

555.23 

555.49 

555.74 

556.00 

9 

556.25 

556.50 

556.76 

557.01 

557.27 

557.52 

557.77 

558.03 

558.28 

558.54 

22.0 

558.79 

559.04 

559.30 

559.55 

559.81 

560.06 

560.31 

560.57 

560.82 

561.08 

1 

561.33 

561.58 

561.84 

562.09 

562.35 

562.60 

562.85 

563.11 

563.36 

563.62 

2 

563.87 

564.12 

564.38 

564.63 

564.89 

565.14 

565.39 

565.65 

565.90 

566.16 

3 

566.41 

566.66 

566.92 

567.17 

567.43 

567.68 

567.93 

568.19 

568.44 

568.70 

4 

568.95 

569.20 

569.46 

569.71 

569.97 

570.22 

570.47 

570.73 

570.98 

571.24 

5 

571.49 

571.74 

572.00 

572.25 

572.51 

572.76 

573.01 

573.27 

573.52 

573.78 

6 

574.03 

574.28 

574.54 

574.79 

575.05 

575.30 

575.55 

575.81 

576.06 

576.32 

7 

576.57 

576.82 

577.08 

577.33 

577.59 

577.84 

578.09 

578.35 

578.60 

578.86 

8 

579.11 

579.36 

579.62 

579.87 

580.13 

580.38 

580.63 

580.89 

581.14 

581.40 

9 

581.65 

581.90 

582.16 

582.41 

582.67 

582.92 

583.17 

583.43 

583.68 

583.94 

23.0 

584.19 

584.44 

584.70 

584.95 

585.21 

585.46 

585.71 

585.97 

586.22 

586.48 

1 

586.73 

586.98 

587.24 

587.49 

587.75 

588.00 

588.25 

588.51 

588.76 

589.02 

2 

589.27 

589.52 

589.78 

590.03 

590.29 

590.54 

590.79 

591.05 

591.30 

591.56 

3 

591.81 

592.06 

592.32 

592.57 

592.83 

593.08 

593.33 

593.59 

593.84 

594.10 

4 

594.35 

594.60 

594.86 

595.11 

595.37 

595.62 

595.87 

596.13 

596.38 

596.64 

5 

596.89 

597.14 

597.40 

597.65 

597.91 

598.16 

598.41 

598.67 

598.92 

599.18 

6 

99.43 

599.68 

599.94 

600.19 

600.45 

00.70 

600.95 

601.21 

601.46 

601.72 

7 

01.97 

602.22 

602.48 

602.73 

602.99 

03.24 

603.49 

603.75 

604.00 

604.26 

8 

04.51 

604.76 

605.02 

605.27 

605.53 

05.78 

606.03 

606.29 

606.54 

606.79 

9 

07.05 

607.30 

607.56 

607.81 

608.06 

08.32 

608.57 

608.83 

609.08 

609.33 

24.0 

09.59 

609.84 

610.10 

610.35 

610.60 

10.86 

611.11 

611.37 

611.62 

611.87 

1 

12.13 

612.38 

12.64 

612.89 

613.14 

13.40 

613.65 

613.91 

614.16 

614.41 

2 

14.67 

614.92 

15.18 

615.43 

615.68 

15.94 

616.19 

616.45 

616.70 

616.95 

3 

17.21 

617.46 

17.72 

617.97 

618.22 

18.48 

618.73 

618.99 

619.24 

619.49 

4 

19.75 

620.00 

20.26 

620.51 

20.76 

21.02 

621.27 

621.53 

621.78 

622.03 

Thousandths  of  an  Inch. 

0. 

1. 

2. 

3. 

4.     5.     6.     7.     S.     9. 

0.0 

0.03 

0.05 

0.08 

0.10    0.13    0.15    0.18    0.20    0.23 

12 


COMPARISON    OF    THE    ENGLISH    AND    METRICAL    BAROMETERS. 


Hundredths  of  an  Inch. 

English 

Inches  and 

tenths. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

24.5 

622.29 

622.54 

622.80 

623.05 

623.30 

623.56 

623.81 

624.07 

624.32 

624.57 

6 

624.83 

625.08 

625.34 

625.59 

625.84 

626.10 

626.35 

626.61 

626.86 

627.11 

7 

627.37 

627.62 

627.88 

628.13 

628.38 

628.64 

628.89 

629.15 

629.40 

629.65 

8 

629.91 

630.16 

630.42 

630.67 

630.92 

631.18 

631.43 

631.69 

631.94 

632.19 

9 

632.45 

632.70 

632.96 

633.21 

633.46 

633.72 

633.97 

634.23 

634.48 

634.73 

25.0 

634.99 

635.24 

635.50 

637.75 

636.00 

636.26 

636.51 

636.77 

637.02 

637.27 

1 

637.53 

637.78 

638.04 

638.29 

638.54 

638.80 

639.05 

639.31 

639.56 

639.81 

2 

640.07 

640.32 

640.58 

640.83 

641.08 

641.34 

641.59 

641.85 

642.10 

642.35 

3 

642.61 

642.86 

643.12 

643.37 

643.62 

643.88 

644.13 

644.39 

644.64 

644.89 

4 

645.15 

645.40 

645.66 

645.91 

646.16 

646.42 

646.67 

646.93 

647.18 

647.43 

5 

647.69 

647.94 

648.20 

648.45 

648.70 

648.96 

649.21 

649.47 

649.72 

649.97 

6 

650.23 

650.48 

650.74 

650.99 

651.24 

651.50 

651.75 

652.01 

652.26 

652.51 

7 

652.77 

653.02 

653.28 

653.53 

653.78 

654.04 

654.29 

654-55 

654.80 

655.05 

8 

655.31 

655.56 

655.82 

656.07 

656.32 

656.58 

656.83 

657.09 

657.34 

657.59 

9 

657.85 

658.10 

658.36 

658.61 

658.86 

659.12 

659.37 

659.63 

659.88 

660.13 

26.0 

660.39 

660.64 

660.90 

661.15 

661.40 

661.66 

661.91 

662.17 

662.42 

662.67 

1 

662.93 

663.18 

663.44 

663.69 

663.94 

664.20 

664.45 

664.71 

664.96 

665.21 

2 

665.47 

665.72 

665.98 

666.23 

666.48 

666.74 

666.99 

667.25 

667.50 

667.75 

3 

668.01 

668.26 

663.52 

668.77 

669.02 

669.28 

669.53 

669.79 

670.04 

670.29 

4 

670.55 

670-80 

671.06 

671.31 

671.56 

671.82 

672.07 

672-33 

672.58 

672.83 

5 

673.09 

673.34 

673.60 

673.85 

674.10 

674.36 

674.61 

674.87 

675.12 

675.37 

6 

675.63 

675.88 

676.14 

676.39 

676.64 

676.90 

677.15 

677.41 

677.66 

677.91 

7 

678.17 

678.42 

678.68 

678.93 

679.18 

679.44 

679.69 

679.95 

680.20 

680.45 

8 

680.71 

680.96 

681.22 

681.47 

681.72 

681.98 

682.23 

682.49 

682.74 

682.99 

9 

683.25 

683.50 

683.76 

684.01 

684.26 

684.52 

684.77 

685.03 

685.28 

685.53 

27.0 

685.79 

686.04 

686.30 

686.55 

686.80 

687.06 

687.31 

687.57 

687.82 

688.07 

1 

688.33 

688.58 

688.84 

689.09 

689.34 

689.60 

689.85 

690.11 

690.36 

690.61 

2 

690.87 

691.12 

691.38 

691.63 

691.88 

692.14 

692.39 

692.65 

692.90 

693.15 

3 

693.41 

693.66 

693.92 

694.17 

694.42 

694.68 

694.93 

695.19 

695.44 

695.69 

4 

695.95 

696.20 

696.46 

696-71 

696.96 

697.22 

697.47 

697.73 

697.98 

698.23 

5 

698.49 

698.74 

699.00 

699.25 

699.50 

699.76 

700.01 

700.27 

700.52 

700.77 

6 

701.03 

701.28 

701.54 

701.79 

702.04 

702.30 

702.55 

702.81 

703.06 

703.31 

7 

703.57 

703.82 

704.08 

704.33 

704.58 

704.84 

705.09 

705.35 

705.60 

705.85 

8 

706.11 

706.36 

706.62 

706.87 

707.12 

707.38 

707.63 

707.89 

708.14 

708.39  i 

9 

708.65 

708.90 

709.16 

709.41 

709.66 

709.92 

710.17 

710.43 

710.68 

710.93  i 

l        Thousandths  of  an  Inch. 

0. 

1. 

2.     3.     4.     5.     6.     7.     8. 

9. 

0.0 

0.03 

0.05    0.08    0.10    0.13    0.15    0.18  |  0.20 

0.23 

COMPARISON    OF    THE    ENGLISH    AND    METRICAL    BAROMETERS. 


Hundredths  of  an  Inch. 

English 

Inches  and 
tenths. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

28.0 

711.19 

711.44 

711.70 

711.95 

712.20 

712.46 

712.71 

712.97 

713.22 

713.47 

1 

713.73 

713.98 

714.24 

714.49 

714.74 

715.00 

715.25 

715  51 

715.76 

716.01 

2 

716.27 

716.52 

716.78 

717.03 

717.28 

717.54 

717.79 

718.04 

718.30 

718.55 

3 

718.81 

719.06 

719.31 

719.57 

719.82 

720.08 

720.33 

720.58 

720.84 

721.09 

4 

721.35 

721.60 

721.85 

722.11 

722.36 

722.62 

722.87 

723.12 

723.38 

723.63 

5 

723.89 

724.14 

724.39 

724.65 

724.90 

725.16 

725.41 

725.66 

725.92 

726.17 

6 

726.43 

726.68 

726.93 

727.19 

727.44 

727.70 

727.95 

728.20 

728.46 

728.71 

7 

728.97 

729.22 

729.47 

729.73 

729.98 

730.24 

730.49 

730.74 

731.00 

731.25 

8 

731.51 

731.76 

732.01 

732.27 

732.52 

732.78 

733.03 

733.28 

733.54 

732.79 

9 

734.05 

734.30 

734.55 

734.81 

735.06 

735.32 

735.57 

735.82 

736.08 

736.33 

29.0 

736.59 

736.84 

737.09 

737.35 

737.60 

737.86 

738.11 

738.36 

738.62 

738.87 

1 

739.13 

739.38 

739.63 

739.89 

740.14 

740.40 

740.65 

740.90 

741.16 

741.41 

2 

741.67 

741.92 

742.17 

742.43 

742.68 

742.94 

743.19 

743.44 

743.70 

743.95 

3 

744.21 

744.46 

744.71 

744.97 

745.22 

745.48 

745.73 

745.98 

746.24 

746.49 

4 

746.75 

747.00 

747.25 

747.51 

747.76 

748.02 

748.27 

748.52 

748.78 

749.03 

5 

749.29 

749.54 

74979 

750.05 

750.30 

750.56 

750.81 

751.06 

751.32 

751.57 

6 

751.83 

752.08 

752.33 

752.59 

752.84 

753.10 

753.35 

753.60 

753.86 

754.11 

7 

754.37 

754.62 

754.87 

755.13 

755.38 

755.64 

755.89 

756.14 

756.40 

756.65 

8 

756.91 

757.16 

757.41 

757.67 

757.92 

758.18 

758.43 

758.68 

758.94 

759.19 

9 

759.45 

759.70 

759.95 

760.21 

760.46 

760.72 

760.97 

761.22 

761.48 

761.73 

30.0 

761.99 

762.24 

762.49 

762.75 

763.00 

763.26 

763.51 

763.76 

764.02 

764.27 

1 

764.53 

764.78 

765.03 

765.29 

765.54 

765.80 

766.05 

766.30 

766.56 

766.81 

2 

767.07 

767.32 

767.57 

767.83 

768.08 

768.34 

768.59 

768.84 

769.10 

769.35 

3 

769.61 

769.86 

770.11 

770.37 

770.62 

770.88 

771.13 

771.38 

771.64 

771.89 

4 

772.15 

772.40 

772.65 

772.91 

773.16 

773.42 

773.67 

773.92 

774.18 

774.43 

5 

774.69 

774.94 

775.19 

775.45 

775.70 

775.96 

776.21 

776.46 

776.72 

776.97 

6 

777.23 

777.48 

777.73 

777.99 

778.24 

778.50 

778.75 

779.00 

779.26 

779.51 

7 

779.77 

780.02 

780.27 

780.53 

780.78 

781.04 

781.29 

781.54 

781.80 

782.05 

8 

782.31 

782.56 

782.81 

783.07 

783.32 

783.58 

783.83 

784.08 

784.34 

784.59 

9 

784.85 

785.10 

785.35 

785.61 

785.86 

786.12 

786.37 

786.62 

786.88 

787.13 

31.0 

787.39 

787.64 

787.89 

788.15 

788.40 

788.66 

788.91 

789.16 

789.42 

789.67 

1 

789.93 

790.18 

790.43 

790.69 

790.94 

791.20 

791.45 

791.70 

791.96 

792.21 

2 

792.47 

792.72 

792.97 

793.23 

793.48 

793.74 

793.99 

794.24 

794.50 

794.75 

3 

795.01 

795.26 

795.51 

795.77 

796.02 

796.28 

796.53 

796.78 

797.04 

797.29 

4 

797.55 

797.80 

798.05 

798.31 

798.56 

798.82 

799.07 

799.32 

799.58 

799.83 

Thousandths  of  an  Inch. 

0. 

1. 

2.     3.     4.     5.     6.     7.     8. 

9. 

0.0 

0.03 

0.05    0.08    0.10    0.13    0.15    0.18    0.20 

0.23 

14 


II.    COMPARISON    OF    THE    ENGLISH    AND    OLD    FRENCH    BAROMETERS. 


1  English  Inch  =  11.2595  French  or  Paris  Lines. 


English 

Tenths  of  an  Inch. 

Inches. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Par.  lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par  lines 

Par.lines. 

Par.lines 

Par.lines 

Par.lines. 

11 

123.85 

124.98 

126.11 

127.23 

128.36 

129.48 

130.61 

131.74 

132.86 

133.99 

12 

135.11 

136.24 

137.37 

138.49 

139.62 

140.74 

141.87 

143.00 

144.12 

145.25 

13 

146.37 

147.50 

148.63 

149.75 

150.88 

152.00 

153.13 

154.26 

155.38 

156.51 

14 

157.63 

158.76 

159.88 

161.01 

162.14 

163.26 

164.39 

165.51 

166.64 

167.77 

15 

168.89 

170.02 

171.14 

172.27 

173.40 

174.52 

175.65 

176.77 

177.90 

179.03 

16 

180.15 

181.28 

182.40 

183.53 

184.66 

185.78 

186.91 

188.03 

189.16 

190.29 

Hundredths  of  an  Inch. 

0. 

1. 

2. 

3.            4.             5.            6.            7. 

8. 

9. 

0.000 

0.113 

0.225 

0.338        0.450          0.563        0.676        0.788 

0.901 

1.013 

English 

Ilundredths  of  an  Inch. 

[nches  and 
Tenths. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Par.lines. 

Par.  lines. 

Par  .lines. 

Par.lines.  Par.lines. 

Par.lines.  !  Par.  lines 

Par.lines 

Par.lines 

Par.lines. 

17.0 

191.41 

191.52 

191.64 

191.75 

191.86 

191.97 

192.09 

192.20 

192.31 

192.42 

1 

192.54 

192.65 

192.76 

192.88 

192.99 

193.10 

193.21 

193.33 

193.44 

193.55 

2 

193.66 

193.78 

193.89 

194.00 

194.11 

194.23 

194.34 

194.45 

194.56 

194.68 

3 

194.79 

194.90 

195.01 

195.13 

195.24 

195.35 

195.46 

195.58 

195.69 

195.80 

4 

195.92 

196.03 

196.14 

196.25 

196.37 

196.48 

196.59 

196.70 

196.82 

196.93 

5 

197.04 

197.15 

197.27 

197.38 

197.49 

197.60 

197.72 

197.83 

197.94 

198.05 

6 

193.17 

198.28 

198.39 

198.50 

198.62 

198.73 

198.84 

198.96 

199.07 

199.18 

7 

199.29 

199.41 

199.52 

199.63 

199.74 

199.86 

199.97 

200.08 

200.19 

200.31 

8 

200.42 

200.53 

200.64 

200.76 

200.87 

200.98 

201.09 

201.21 

201.32 

201.43 

9 

201.55 

201.66 

201.77 

201.88 

202.00 

202.11 

202.22 

202.33 

202.45 

202.56 

18.0 

202.67 

202.78 

202.90 

203.01 

203.12 

203.23 

203.35 

203.46 

203.57 

203.68 

i 

203.80 

203.91 

204.02 

204.13 

204.25 

204.36 

204.47 

204.59 

204.70 

204.81 

2 

204.92 

205.04 

205.15 

205.26 

205.37 

205.49 

205.60 

205.71 

205.82 

205.94 

3 

206.05 

206.16 

206.27 

206.39 

206.50 

206.61 

206.72 

206.84 

206.95 

207.06 

4 

207.17 

207.29 

207.40 

207.51 

207.63 

207.74 

207.85 

207.96 

208.08 

2Q8.19 

5 

208.30 

208.41 

208.53 

208.64 

208.75 

208.86 

208.98 

209.09 

209.20 

209.31 

6 

209.43 

209.54 

209.65 

209.76 

209.88 

209.99 

210.10 

210.21 

210.33 

210.44 

7 

210.55 

210.67 

210.78 

210.89 

211.00 

211.12 

211.23 

211.34 

211.45 

211.5,7 

8 

211.68 

211.79 

211.90 

212.02 

212.13 

212.24 

212.35 

212.47 

212.58 

212.69 

9 

212.80 

212.92 

213.03 

213.14 

213.25 

213.37 

213.48 

213.59 

213.71 

213.82 

19.0 

213.93 

214.04 

214.16 

214.27 

214.38 

214.49 

214.61 

214.72 

214.83 

214.94 

1 

215.06 

215.17 

215.28 

215.39 

215.51 

215.62 

215.73 

215.84 

215.96 

216.07 

2 

216.18 

216.29 

216.41 

216.52 

216.63 

216.75 

216.86 

216.97 

217.08 

217.20 

3 

217.31 

217.42 

217.53 

217.65 

217.76 

217.87 

217.98 

218.10 

218.21 

218.32 

4 

218.43 

218.55 

218.66 

218.77 

218.88 

219.00 

219.11 

219.22 

219.34 

219.45 

5 

219.56 

219.67 

219.79 

219.90 

220.01 

220.12 

220.24 

220.35 

220.46 

220.57 

6 

220.69 

220.80 

220.91 

221.02 

221.14 

221.25 

221.36 

221.47 

221.59 

221.70 

7 

221.81 

221.92 

222.04 

222.15 

222.26 

222.38 

222.49 

222.60 

222.71 

222.83 

8 

222.94 

223.05 

223.16 

223.28 

223.39 

223.50 

223.61 

223.73- 

223.84 

223.95 

9 

224.06 

224.18 

224.29 

224.40 

224.51 

224.63 

224.74 

224.85 

224.96 

225.08 

15 


COMPARISON    OF    THE    ENGLISH    AND    OLD    FRENCH    BAROMETERS. 
1  English  Inch  =  11.2595  French  or  Paris  Lines. 


Hundredths  of  an  Inch. 

English 
In.cn.6S  ftnd 

Tenths. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7.    8. 

9. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines.  Par.lines. 

Par.lines. 

20.0 

225.19 

225.30 

225.42 

225.53 

225.64 

225.75 

225.87 

225.98  226.09 

226.20 

1 

226.32 

226.43. 

226.54 

226.65 

226.77 

226.88 

226.99 

227.10  227.22 

227.33 

2 

227.44 

227.55 

227.67 

227.78 

227.89 

228.00 

228.12 

228.23 

228.34 

228.46 

3 

228.57 

228.68 

228.79 

228.91 

229.02 

229.13 

229.24 

229.36 

229.47 

229.58 

4 

229.69 

229.81 

229.92 

230.03 

230.14 

230.26 

230.37 

230.48 

230.59 

230.71 

5 

230.82 

230.93 

231.04 

231.16 

231.27 

231.38 

231.50 

231.61 

231.72 

231.83 

6 

231.95 

232.06 

232.17 

232.28 

232.40 

232.51 

232.62 

232.73 

232.85 

232.96 

7 

233.07 

233.18 

233.30 

233.41 

233.52 

233.63 

233.75- 

233.86 

233.97 

234.09 

8 

234.20 

234.31 

234.42 

234.54 

234.65 

234.76 

234.87 

234.99- 

235.10 

235.21 

9 

235.32 

235.44 

235.55 

235.66 

235.77 

235.89 

236.00 

236.11 

236.22 

236.34 

21.0 

236.45 

236.56 

236.67 

236.79 

236.90 

237.01 

237.13 

237.24 

237.35 

237.46 

1 

237.58 

237.69 

237.80 

237.91 

238.03 

238.14 

238.25 

238.36 

238.48 

238.59 

2 

238.70 

238.81 

238.93 

239.04 

239.15 

239.26 

239.38 

239.49 

239.60 

239.71 

3 

239.83 

239.94 

240.05 

240/17 

240.28 

240.39 

240.50 

240.62 

240.73 

240.84 

4 

240.95 

241.07 

241.18 

241.29 

241.40 

241.52 

241.63 

241.74 

241.85 

241.97 

5 

242.08 

242.19 

242.30 

242.42 

242.53 

242.64 

242.75 

242.87 

242.98 

243.09 

6 

243.21 

243.32 

243.43 

243.54 

243.66 

243.77 

243.88 

243.99 

241.11 

244.22 

7 

244.33 

244.44 

244.56 

244.67 

244.78 

244.89 

245.01 

245.12 

245.23 

245.34 

8 

245.46 

245.57 

245.68 

245.79 

245.91 

246.02 

246.13 

246.25 

246.36 

246.47 

9 

246.58 

246.70 

246.81 

246.92 

247.03 

247.15 

247.26 

247.37 

247.48 

247.60 

22.0 

247.71 

247.82 

247.93 

248.05 

248.16 

248.27 

248.38 

248.50 

248.61 

248.72 

1 

248.83 

248.95 

249.06 

249.17 

249.29 

249.40 

249.51 

249.62 

249.74 

249.85 

2 

249.96 

250.07 

250.19 

250.30 

250.41 

250.52 

250.64 

250.75 

250.86 

250.97 

3 

251.09 

251.20 

251.31 

251.42 

251.54 

251.65 

251.76 

251.88 

251.99 

252.10 

4 

252.21 

252.33 

252.44 

252.55 

252.66 

252.78 

252.89 

253.00 

253.11 

253.23 

.5 

253.34 

253.45 

253.56 

253.68 

253.79 

253.90 

254.01 

254.13 

254.24 

254.35 

6 

254.46 

254.58 

254.69 

254.80 

254.92 

255.03 

255.14 

255.25 

255.37 

255.48 

7 

255.59 

255.70 

255.82 

255.93 

256.04 

256.15 

256.27 

256.38 

256.49 

256.60 

8 

256.72 

256.83 

256.94 

257.05 

257.17 

257.28 

257.39 

257.50 

257.62 

257.73 

9 

257.84 

257.96 

258.07 

258.18 

258.29 

258.41 

258.52 

258.63 

258.74 

258.86 

23.0 

258.97 

259.08 

259.19 

259.31 

259.42 

259.53 

259.64 

259.76 

259.87 

259.98 

1 

260.09 

260.21 

260.32 

260.43 

260.54 

260.66 

260.77 

260.88 

261.00 

261.11 

2 

261.22 

261.33 

261.45 

261.56 

261.67 

261.78 

261.90 

262.01 

262.12 

262.23 

3 

262.35 

262.46 

262.57 

262.68 

262.80 

262.91 

263.02 

263.13 

263.25 

263.36 

4 

263.47 

263.58 

263.70 

263.81 

263.92 

264.04 

264.15 

264.26 

264.37 

264.49 

5 

264.60 

264.71 

264.82 

264.94 

265.05 

265.16 

265.27 

265.39 

265.50 

265.61 

6 

265.72 

265.84 

265.95 

266.06 

266.17 

266.29 

266.40 

266.51 

266.62 

266.74 

7 

266.85 

266.96 

267.08 

267.19 

267.30 

267.41 

267.53 

267.64 

267.75 

267.86 

8 

267.98 

268.09 

268.20 

268.31 

268.43 

268.54 

268.65 

268.76 

268.88 

263.99 

9 

269.10 

269.21 

269.33 

269.44 

269.55 

269.67 

269.78 

269.89 

270.00 

270.12 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

__ 

16 


COMPARISON    OF    THE    ENGLISH   AND    OLD    FRENCH    BAROMETERS. 
1  English  Inch  =  11.2595  French  or  Paris  Lines. 


English 

Hundredths  of  an  Inch. 

Tenths. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7.    8. 

9. 

Par.lines 

Par.lines 

Par.lines 

Par.lines 

Par.lines 

Par.lines 

Par.lines 

Par.lines 

Par.lines 

Par.lines. 

24.0 

270.23 

270.34 

270.45 

270.57 

270.68 

270.79 

270.90 

271.02 

271.13 

271.24 

1 

271.35 

271.47 

271.58 

271.69 

271.80 

271.92 

272.03 

272.14 

272.25 

272.37 

2 

272.48 

272.59 

272.71 

272.82 

272.93 

273.04 

273.16 

273.27 

273.38 

273.49 

3 

273.61 

273.72 

273.83 

273.94 

274.06 

274.17 

274.28 

274.39 

274.51 

274.62 

4 

274.73 

274.84 

274.96 

275.07 

275.18 

275.29 

275.41 

275.52 

27S-.63 

275.75 

5 

275.86 

275.97 

276.08 

276.20 

276.31 

276.42 

276.53 

276.65 

276.76 

276.87 

6 

276.98 

277.10 

277.21 

277.32 

277.43 

277.55 

277.66 

277.77 

277.88 

278.00 

7 

278.11 

278.22 

278.33 

278.45 

278.56 

278.67 

278.79 

278.90 

279.01 

279.12 

8 

279.24 

279.35 

279.46 

279.57 

279.69 

279.80 

279.91 

280.02 

280.14 

280.25 

9 

280.36 

280.47 

280.59 

280.70 

280.81 

280.92 

281.04 

281.15 

281.26 

281.38 

25.0 

281.49 

281.60 

281.71 

281.83 

281.94 

282.05 

282.16 

282.28 

282.39 

282.50 

1 

282.61 

282.73 

282.84 

282.95 

283.06 

283.18 

283.29 

283.40 

283.51 

283.63 

2 

283.74 

283.85 

283.96 

284.08 

284.19 

284.30 

284.41 

284.53 

284.64 

284.75 

3 

284.87 

284.98 

285.09 

285.20 

285.32 

285.43 

285.54 

285.65 

285.77 

285.88 

4 

285.99 

286.10 

286.22 

286.33 

286.44 

286.55 

286.67 

286.78 

286.89 

287.00 

5 

287.12 

287.23 

287.34 

287.46 

287.57 

287.68 

287.79 

287.91 

288.02 

288.13 

6 

288.24 

288.36 

288.47 

288.58 

288.69 

288.81 

288.92 

289.03 

289.14 

289.26 

7 

289.37 

289.48 

289.59 

289.71 

289.82 

289.93 

290.04 

290.16 

290.27 

290.38 

8 

290.50 

290.61 

290.72 

290.83 

290.95 

291.06 

291.17 

291.28 

291.40 

291.51 

9 

291.62 

291.73 

291.85 

291.96 

292.07 

292.18 

292.30 

292.41 

292.52 

292.63 

26.0 

292.75 

292.86 

292.97 

293.08 

293.20 

293.31 

293.42 

293.54 

293.65 

293.76 

1 

293.87 

293.99 

294.10 

294.21 

294.32 

294.44 

294.55 

294.66 

294.77 

294.89 

2 

295.00 

295.11 

295.22 

295.34 

295.45 

295.56 

295.67 

295.79 

295.90 

296.01 

3 

296.12 

296.24 

296.35 

296.46 

296.58 

296.69 

296.80 

296.91 

297.03 

297.14 

4 

297.25 

297.36 

297.48 

297.59 

297.70 

297.81 

297.93 

298.04 

298.15 

298.26 

5 

298.38 

298.49 

298.60 

298.71 

298.83 

298.94 

299.05 

299.17 

299.28 

299.39 

6 

299.50 

299.62 

299.73 

299.84 

299.95 

300.07 

300.18 

300.29 

300.40 

300.52 

7 

300.63 

300.74 

300.85 

300.97 

301.08 

301.19 

301.30 

301.42 

301.53 

301.64 

8 

301.75 

301.87 

301.98 

302.09 

302.20 

302.32 

302.43 

302.54 

302.66 

302.77 

9 

302.88 

302.99 

303.11 

303.22 

303.33 

303.44 

303.56 

303.67 

303.78 

303.89 

27.o 

304.01 

304t12 

304.23 

304.34 

304.46 

304.57 

304.68 

304.79 

304.91 

305.02 

i 

305.13 

305.25 

305.36 

305.47 

305.58 

305.70 

305.81 

305.92 

306.03 

306.15 

2 

306.26 

306.37 

306.48 

306.60 

306.71 

306.82 

306.93 

307.05 

307.16 

307.27 

3 

307.38 

307.50 

307.61 

307.72 

307.83 

307.95 

308.06 

308.17 

308.29 

308.40 

4 

308.51 

308.62 

308.74 

308.85 

308.96 

309.07 

309.19 

309.30 

309.41 

309.52 

5 

309.64 

309.75 

309.86 

309.97 

310.09 

310.20 

310.31 

310.42 

310.54 

310.65 

6- 

310.76 

310.87 

310.99 

311.10 

311.21 

311.33 

311.44 

311.55 

311.66 

311.78 

7 

311.89 

312.00 

312.11 

312.23 

312.34 

312.45 

312.56 

312.68 

312.79 

312.90 

8 

313.01 

313.13 

313.24 

313.35 

313.46 

313.58 

313.69 

313.80 

313.91 

314.03 

9 

314.14 

314.25 

314.37 

314.48 

314.59 

314.70 

314.82 

314.93 

315.04 

315.15 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

17 


4  COMPARISON    OF    THE    ENGLISH   AND    OLD    FRENCH   BAROMETERS. 

1  English  Inch  =  11.2595  French  or  Paris  Lines. 


Hundredths  of  an  Inch. 

English 

Tenths. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Par.  lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par  .lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

28.0 

315.27 

315.38 

315.49 

315.60 

315.72 

315.83 

315.94 

316.05 

316.17 

316.28 

1 

316.39 

316.50 

316.62 

316.73 

316.84 

316.95 

317.07 

317.18 

317.29 

317.41 

2 

317.52 

317.63 

317.74 

317.86 

317.97 

318.08 

318.19 

318.31 

318.42 

318.53 

3 

318.64 

318.76 

318.87 

318.98 

319.09 

319.21 

319.32 

319.43 

319.54 

319.66 

4 

319.77 

319.88 

319.99 

320.11 

320.22 

320.33 

320.45 

320.56 

320.67 

320.78 

5 

320.90 

321.01 

321.12 

321.23 

321.35 

321.46 

321.57 

321.68 

321.80 

321.91 

6 

322.02 

322.13 

322.25 

322.36 

322.47 

322.58 

322.70 

322.81 

322.92 

323.04 

7 

323.15 

323.26 

323.37 

323.49 

323.60 

323.71 

323.82 

323.94 

324.05 

324.16 

8 

324.27 

324.39 

324.50 

324.61 

324.72 

324.84 

324.95 

325.06 

325.17 

325.29 

9 

325.40 

325.51 

325.62 

325.74 

325.85 

325.96 

326.08 

326.19 

326.30 

326.41 

29.0 

326.53 

326.64 

326.75 

326.86 

326.98 

327.09 

327.20 

327.31 

327.43 

327.54 

1 

327.65 

327.76 

327.88 

327.99 

328.10 

328.21 

328.33 

328.44 

328.55 

328.66 

2 

328.78 

328.89 

329.00 

329.12 

329.23 

329.34 

329.45 

329.57 

329.68 

329.79 

3 

329.90 

330.02 

330.13 

330.24 

330.35 

330.47 

330.58 

330.69 

330.80 

330.92 

4 

331.03 

331.14 

331.25 

331.37 

331.48 

331.59 

331.70 

331.82 

331.93 

332.04 

5 

332.16 

332.27 

332.38 

332.49 

332.61 

332.72 

332.83 

332.94 

333.06 

333.17 

6 

333.28 

333.39 

333.51 

333.62 

333.73 

333.84 

333.96 

334.07 

334.18 

334.29 

7 

334.41 

334.52 

334.63 

334.74 

334.86 

334.97 

335.08 

335.20 

335.31 

335.42 

8 

335.53 

335.65 

335.76 

335.87 

335.98 

336.10 

336.21 

336.32 

336.43 

336.55 

9 

336.66 

336.77 

336.88 

337.00 

337.11 

337.22 

337.33 

337.45 

337.56 

337.67 

30.0 

337.78 

337.90 

338.01 

338.12 

338.24 

338.35 

338.46 

338.57 

338.69 

338.80 

1 

338.91 

339.02 

339.14 

339.25 

339.36 

339.47 

339.59 

339.70 

339.81 

339.92 

2 

340.04 

340.15 

340.26 

340.37 

340.49 

340.60 

340.71 

340.83 

340.94 

341.05 

3 

341.16 

341.28 

341.39 

341.50 

341.61 

341.73 

341.84 

341.95 

342.06 

342.18 

4 

342.29 

342.40 

342.51 

342.63 

342.74 

342.85 

342.96 

343.08 

343.19 

343.30 

5 

343.41 

343.53 

343.64 

343.75 

343.87 

343.98 

344.09 

344.20 

344.32 

344.43 

6 

344.54 

344.65 

344.77 

344.88 

344.99 

345.10 

345.22 

345.33 

345.44 

345.55 

7 

345.67 

345.78 

345.89 

346.00 

346.12 

346.23 

346.34 

346.45 

346.57 

346.68 

8 

346.79 

346.91 

347.02 

347.13 

347.24 

347.36 

347.47 

347.58 

347.69 

347.81 

9 

347.92 

348.03 

348.14 

348.26 

348.37 

348.48 

348.59 

348.71 

348.82 

348.93 

31.0 

349.04 

349.16 

349.27 

349.38 

349.49 

349.61 

349.72 

349.83 

349.95 

350.06 

1 

350.17 

350.28 

350.40 

350.51 

350.62 

350.73 

350.85 

350.96 

351.07 

351.18 

2 

351.30 

351.41 

351.52 

351.63 

351.75 

351.86 

351.97 

352.08 

352.20 

352.31 

3 

352.42 

352.53 

352.65 

352.76 

352.87 

352.99 

353.10 

353.21 

353.32 

353.44 

4 

353.55 

353.66 

353.77 

353.89 

354.00 

354.11 

354.22 

354.34 

354.45 

354.56 

5 

354.67 

354.79 

354.90 

355.01 

355.12 

355.24 

355.35 

355.46 

355.57 

355.69 

6 

355.80 

355.91 

356.03 

356.14 

356.25 

356.36 

356.48 

356.59 

356,70 

356.81 

Thousandths  of  an  Inch. 

0. 

1. 

2. 

3.     4.      5.     6.     7.     8. 

9. 

0.000 

0.011 

0.023 

0.034   0.045    0.056   0.068   0.079   0.090 

0.101 

18 


III. -IV. 


COMPARISON 


OP 


THE    METRICAL    BAROMETER 


WITH 


THE  ENGLISH  AND  THE  OLD  FRENCH  BAROMETERS, 


OR 


T  AB'LE  S 

FOR  CONVERTING  MILLIMETRES  INTO   ENGLISH  INCHES  AND  DECIMALS, 
AND   INTO   FRENCH   OR  PARIS   LINES  ; 

GIVING   THE   VALUES    CORRESPONDING    TO    EVERY  MILLIMETRE    FROM  250   TO   600; 
AND   TO   EVERY  TENTH   OF   A   MILLIMETRE   FROM  600   TO   800  MILLIMETRES. 


19 


III.    COMPARISON    OF    THE    METRICAL    AND    ENGLISH    BAROMETERS. 
1  Metre  =  39.37079  English  Inches. 


Millimetres.   Units. 

Millime- 

tres. 
Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

250 

9.843 

9.882 

9.921 

9.961 

10.000 

10.040 

10.079 

10.118 

10.158 

10.197 

260 

10.236 

10.276 

10.315 

10.355 

10.394 

10.433 

10.473 

10.512 

10.551 

10.591 

270 

10.630 

10.669 

10.709 

10.748 

10.788 

10.827 

10.866 

10.906 

10.945 

10.984 

280 

11.024 

11.063 

11.103 

11.142 

11.181 

11.221 

11.260 

11.299 

11.339 

11.378 

290 

11.418 

11.457 

11.496 

11.536 

11.575 

11.614 

11.654 

11.693 

11.732 

11.772 

300 

11.811 

11.851 

11.890 

11.929 

11.969 

12.008 

12.047 

12.087 

12.126 

12.166 

310 

12.205 

12.244 

12.284 

12.323 

12.362 

12.402 

12.441 

12.481 

12.520 

12.559 

320 

12.599 

12.638 

12.677 

12.717 

12.756 

12.795 

12.835 

12.874 

12.914 

12.953 

330 

12.992 

13.032 

13.071 

13.110 

13.150 

13.189 

13.229 

13.268 

13.307 

13.347 

340 

13.386 

13.425 

13.465 

13.504 

13.544 

13.583 

13.622 

13.662 

13.701 

13.740 

350 

13.780 

13.819 

13.859 

13.898 

13.937 

13.977 

14.016 

14.055 

14.095 

14.134 

360 

14.173 

14.213 

14.252 

14.292 

14.331 

14.370- 

14.410 

14.449 

14.488 

14.528 

370 

14.567 

14.607 

14.646 

14.685 

14.725 

14.764 

14.803 

14.843 

14.882 

14.922 

380 

14.961 

15.000 

15.040 

15.079 

15.118 

15.158 

15.197 

15.236 

15.276 

15.315 

390 

15.355 

15.494 

15.433 

15.473 

15.512 

15.551 

15.591 

15.630 

15.670 

15.709 

400 

15.748 

15.788 

15.827 

15.866 

15.906 

15.945 

15.985 

16.024 

16.063 

16.103 

410 

16.142 

16.181 

16.221 

16.260 

16.300 

16.339 

16.378 

16.418 

16.458 

16.496 

420 

16.536 

16.575 

16.614 

16.654 

16.693 

16.733 

16.772 

16.811 

16.851 

16.890 

430 

16.929 

16.969 

17.008 

17.048 

17.087 

17.126 

17.166 

17.205 

17.244 

17.284 

440 

17.323 

17.362 

17.402 

17.441 

17.481 

17.520 

17.559 

17.599 

17.638 

17.677 

450 

17.717 

17.756 

17.796 

17.835 

17.874 

17.914 

17.953 

17.992 

18.032 

18.071 

460 

18.111 

18.150 

18.189 

18.229 

18.268 

18.307 

18.347 

18.386 

18.426 

18.465 

470 

18.504 

18.544 

18.583 

18.622 

18.662 

18.701 

18.740 

18.780 

18.819 

18.859 

480 

18.898 

18.937 

18.977 

19.016 

19.055 

19.095 

19.134 

19.174 

19.213 

19.252 

490 

19.292 

19.331 

19.370 

19.410 

19.449 

19.489 

19.528 

19.567 

19.607 

19.646 

500 

19.685 

19.725 

19.764 

19.804 

19.843 

19.882 

19.922 

19.961 

20.000 

20.040 

510 

20.079 

20.118 

20.158 

20.197 

20.237 

20.276 

20.315 

20.355 

20.394 

20.433 

520 

20.473 

20.512 

20.552 

20.591 

20.630 

20.670 

20.709 

20.748 

20.788 

20.827 

530 

20.867 

20.906 

20.945 

20.985 

21.024 

21.063 

21.103 

21.142 

21.181 

21.221 

540 

21.260 

21.300 

21.339 

21.378 

21.418 

21.457 

21.496 

21.536 

-21.575 

21.615 

550 

21.654 

21.693 

21.733 

21.772 

21.811 

21.851 

21.890 

21.930 

21.969 

22.008 

560 

22.048 

22.087 

22.126 

22.166 

22.205 

22.244 

22.284 

22.323 

22.363 

22.402 

570 

22.441 

22.481 

22.520 

22.559 

22.599 

22.638 

22.678 

22.717 

22.756 

22.796 

580 

22.835 

22.874 

22.914 

22.953 

22.993 

23.032 

23.071 

23.111 

23.150 

23.189 

590 

23.229 

23.268 

23.308 

23.347 

23.386 

23.426 

23.465 

23.504 

23.544 

23.583 

Tenths  of  Millimetres. 

0. 

1. 

2. 

3.     4.      5.     6.     7.     §. 

9. 

0.000    0.004 

0.008 

0.012    0.016    0.020    0.024    0.028    0.031 

0.035  ! 

21 


COMPARISON    OF    THE    METRICAL    AND    ENGLISH    BAROMETERS. 
1  Metre  =  39.37079  English  Inches. 


Millime- 

Tenths of  Millimetres. 

tres. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

y. 

8. 

9. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

600 

23.622 

23.626 

23.630 

23.634 

23.638 

23.642 

23.646 

23.650 

23.654 

23.658 

601 

23.662 

23.666 

23.670 

23.674 

23.678 

23.682 

23.685 

23.689 

23.693 

23.697 

602 

23.701 

23.705 

23.709 

23.713 

23.717 

23.721 

23.725 

23.729 

23.733 

23.737 

603 

23.741 

23.745 

23.748 

23.752 

23.756 

23.760 

23.764 

23.768 

23.772 

23.776 

604 

23.780 

23.784 

23.788 

23.792 

23.796 

23.800 

23.804 

23.808 

23.811 

23.815 

605 

23.819 

23.823 

23.827 

23.831 

23.835 

23.839 

23.843 

23.847 

23.851 

23.855 

606 

23.859 

23.863 

23.867 

23.871 

23.874 

23.878 

23.882 

23.886 

23.890 

23.894 

607 

23.898 

23.902 

23.906 

23.910 

23.914 

23.918 

23.922 

23.926 

23.930 

23.934 

608 

23.937 

23.941 

23.945 

23.949 

23.953 

23.957 

23.961 

23.965 

23.969 

23.973 

609 

23.977 

23.981 

23.985 

23.989 

23.993 

23.996 

24.000 

24.004 

24.008 

24.012 

610 

24.016 

24.020 

24.024 

24.028 

24.032 

24.036 

24.040 

24.044 

24.048 

24.052 

611 

24.056 

24.059 

24.063 

24.067 

24.071 

24.075 

24.079 

24.083 

24.087 

24.091 

612 

24.095 

24.099 

24.103 

24.107 

24.111 

24.115 

24.119 

24.122 

24.126 

24.130 

613 

24.134 

24.138 

24.142 

24.146 

24.150 

24.154 

24.158 

24.162 

24.166 

24.170 

614 

24.174 

24.178 

24.182 

24.185 

24.189 

24.193 

24.197 

24.201 

24.205 

24.209 

615 

24.213 

24.217 

24.221 

24.225 

24.229 

24.233 

24.237 

24.241 

24.245 

24.248 

616 

24.252 

24.256 

24.260 

24.264 

24.268 

24.272 

24.276 

24.280 

24.284 

24.288 

617 

24.292 

24.296 

24.300 

24.304 

24.308 

24.311 

24.315 

24.319 

24.323 

24.327 

618 

24.331 

24.335 

24.339 

24.343 

24.347 

24.351 

24.355 

24.359 

24.363 

24.367 

619 

24.371 

24.374 

24.378 

24.382 

24.386 

24.390 

24.394 

24.398 

24.402 

24.406 

620 

24.410 

24.414 

24.418 

24.422 

24.426 

24.430 

24.434 

24.437 

24.441 

24.445 

621 

24.449 

24.453 

24.457 

24.461 

24.465 

24.469 

24.473 

24.477 

24.481 

24.485 

622 

24.489 

24.493 

24.497 

24.500 

24.504 

24.508 

24.512 

24.516 

24.520 

24.524 

623 

24.528 

24.532 

24.536 

24.540 

24.544 

24.548 

24.552 

24.556 

24.559 

24.563 

624 

24.567 

24.571 

24.575 

24.579 

24.583 

24,587 

24.591 

24.595 

24.599 

24.603 

625 

24.607 

24.611 

24.615 

24.619 

24.622 

24.626 

24.630 

24.634 

24.638 

24.642 

626 

24.646 

24.650 

24.654 

24.658 

24.662 

24.666 

24.670 

24.674 

24.678 

24.682 

627 

24.685 

24.689 

24.693 

24.697 

24.701 

24.705 

24.709 

24.713 

24.717 

24.721 

628 

24.725 

24.729 

24.733 

24.737 

24.741 

24.745 

24.748 

24.752 

24.756 

24.760 

629 

24.764 

24.768 

24.772 

24.776 

24.780 

24.784 

24.788 

24.792 

24.796 

24.800 

630 

24.804 

24.808 

24.811 

24.815 

24.819 

24.823 

24.827 

24.831 

24.835 

24.839 

631 

24.843 

24.847 

24.851 

24.855 

24.859 

24.863 

24.867 

24.871 

24.874 

24.878 

632 

24.882 

24.886 

24.890 

24.894 

24.898 

24.902 

24.906 

24.910 

24.914 

24.918 

633 

24.922 

24.926 

24.930 

24.934 

24.937 

24.941 

24.945 

24.949 

24.953 

24.957 

634 

24.961 

24.965 

24.969 

24.973 

24.977 

24.981 

24.985 

24.989 

24.993 

24.997 

635  ' 

25.000 

25.004 

25.008 

25.012 

25.016 

25.020 

25.024 

25.028 

25.032 

25.036 

636 

25.040 

25.044 

25.048 

25.052 

25.056 

25.060 

25.063 

25.067 

25.071 

25.075 

637 

25.079 

25.083 

25.087 

25.091 

25.095 

25.099 

25.103 

25.107 

25.111 

25.115 

638 

25.119 

25.123 

25.126 

25.130 

25.134 

25.138 

25.142 

25.146 

25.150 

25.154 

639 

25.158 

25.162 

25.166 

25.170 

25.174 

25.178 

25.182 

25.185 

25.189 

25.193 

0. 

1. 

2. 

3. 

4. 

5. 

C. 

7. 

8. 

9. 

COMPARISON    OF    THE    METRICAL    AND    ENGLISH    BAROMETERS. 

1  Metre  =  39.37079  English  Inches. 


Tenths  of  Millimetres. 

Millime- 

tres. 

O.    1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Eng.  In.  Eng.  In. 

Eng.  In. 

Eng.  In.  !  Eng.  In. 

Eng.  In. 

Eug.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

640 

25.197  25.201 

25.205 

25.209 

25.213 

25.217 

25.221 

25.225 

25.229 

25.233 

641 

25.237 

25.241 

25.245 

25.248 

25.252 

25256 

25.260 

25.264 

25.268 

25.272 

642 

25.276 

25.280 

25.284 

25.288 

25.292 

25.296 

25.300 

25.304 

25.308 

25.311 

643 

25.315 

25.319 

25.323 

25.327 

25.331 

25.335 

25.339 

25.343 

25.347 

25.351 

644 

25.355 

25.359 

25.363 

25.367 

25.371 

25.374 

25.378 

25.382 

25.386 

25.390 

645 

25.394 

25.398 

25.402 

25.406 

25.410 

25.414 

25.418 

25.422 

25.426 

25.430 

646 

25.434 

25.437 

25.441 

25.445 

25.449 

25.453 

25.457 

25.461 

25.465 

25.469 

647 

25.473 

25.477 

25.481 

25.485 

25.489 

25.493 

25.497 

25.500 

25.504 

25.508 

648 

25.512 

25.516 

25.520 

25.524 

25.528 

25.532 

25.536 

25.540 

25.544 

25.548 

649 

25.552 

25.556 

25.560 

25.563 

25.567 

25.571 

25.575 

25.579 

25.583 

25.587 

650 

25.591 

25.595 

25.599 

25.603 

25.607 

25.611 

25.615 

25.619 

25.623 

25.626 

651 

25.630 

25.634 

25.638 

25.642 

25.646 

25.650 

25.654 

25.658 

25.662 

25.666 

652 

25.670 

25.674 

25.678 

25.682 

25.686 

25.689 

25.693 

25.697 

25.701 

25.705 

653 

25.709 

25.713 

25.717 

25.721 

25.725 

25.729 

25.733 

25.737 

25.741 

25.745 

654 

25.748 

25.752 

25.756 

25.760 

25.764 

25.768 

25.772 

25.776 

25.780 

25.784 

655 

25.788 

25.792 

25.796 

25.800 

25.804 

25.808 

25.811 

25.815 

25.819 

25.823 

656 

25.827 

25.831 

25.835 

25.839 

25.843 

25.847 

25.851 

25.855 

25.859 

25.863 

657 

25.867 

25.871 

25.874 

25.878 

25.882 

25.886 

25.890 

25.894 

25.898 

25.902 

658 

25.906 

25.910 

25.914 

25.918 

25.922 

25.926 

25.930 

25.934 

25.937 

25.941 

659 

25.945 

25.949 

25.953 

25.957 

25.961 

25.965 

25.969 

25.973 

25.977 

25.981 

660 

25.985 

25.989 

25.993 

25.997 

26.000 

26.004 

26.008 

26.012 

26.016 

26.020 

661 

26.024 

26.028 

26.032 

26.036 

26.040 

26.044 

26.048 

26.052 

26.056 

26.060 

662 

26.063 

26.067 

26.071 

26.075 

26.079 

26.083 

26.087 

26.091 

26.095 

26.099 

663 

26.103 

26.107 

26.111 

26.115 

26.119 

26.123 

26.126 

26.130 

26.134 

26.138 

664 

26.142 

26.146 

26.150 

26.154 

26.158 

26.162 

26.166 

26.170 

26.174 

26.178 

665 

26.182 

26.186 

26.189 

26.193 

2*6.197 

26.201 

26.205 

26.209 

26.213 

26.217 

666 

26  221 

26.225 

26.229 

26.233 

26.237 

26.241 

26.245 

26.249 

26.252 

26.256 

667 

26.260 

26.264 

26.268 

26.272 

26.276 

26.280 

26.284 

26.288 

26.292 

26.296 

668 

26.300 

26.304 

26.308 

26.311 

26.315 

26.319 

26.323 

26.327 

26.331 

26.335 

669 

26.339 

26.343 

26.347 

26.351 

26.355 

26.359 

26.363 

26.367 

26.371 

26.374 

670 

26.378 

26.382 

26.386 

26.390 

26.394 

26.398 

26.402 

26.406 

26.410 

26.414 

671 

26.418 

26.422 

26.426 

26.430 

26.434 

26.437 

26.441 

26.445 

26.449 

26.453 

672 

26.457 

26.461 

26.465 

26.469 

26.473 

26.477 

26.481 

26.485 

26.489 

26.493 

673 

26.497 

26.500 

26.504 

26.508 

26.512 

26.516 

26.520 

26.524 

26.528 

26.532 

674 

26.536 

26.540 

26.544 

26.548 

26.552 

26.556 

26.560 

26.563 

26.567 

26.571 

675 

26.575 

26.579 

26.583 

26.587 

26.591 

26.595 

26.599 

26.603 

26.607 

26.611 

676 

26.615 

26.619 

26.623 

26.626 

26.630 

26.634 

26.638 

26.642 

26.646 

26.650 

677 

26.654 

26.658 

26.662 

26.666 

26.670 

26.674 

26.678 

26.682 

26.686 

26.689 

678 

26.693 

26.697 

26.701 

26.705 

26.709 

26.713 

26.717 

26.721 

26.725  26.729 

679 

26.733 

26.737 

26.741 

26.745 

26.749 

26.752 

26.756 

26.760 

26.764 

26.768 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

T. 

8. 

9. 

23 


COMPARISON    OF    THE    METRICAL    AND    ENGLISH    BAROMETERS. 
1  Metre  ==  39.37079  English  Inches. 


Millime- 

Tenths of  Millimetres. 

tres. 

0. 

1. 

2.    3. 

4. 

5. 

6. 

r« 

8. 

0. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In.  Eng.  In. 

Eng.  In. 

680 

26.772 

26.776 

26.780 

26.784 

26.788 

26.792 

26.796 

26.800 

26.804 

26.808 

681 

26.812 

26.815 

26.819 

26.823 

26.827 

26.831 

26.835 

26.839 

26.843 

26.847 

682 

26.851 

26.855 

26.859 

26.863 

26.867 

26.871 

26.875 

26.878 

26.882 

26.886 

683 

26.890 

26.894 

26.898 

26.902 

26.906 

26.910 

26.914 

26.918 

26.922 

26.926 

684 

26.930 

26.934 

26.937 

26.941 

26.945 

26.949 

26.953 

26.957 

26.961 

26.965 

685 

26.969 

26.973 

26.977 

26.981 

26.985 

26.989 

26.993 

26.997 

27.000 

27.004 

686 

27.008 

27.012 

27.016  27.020 

27.024 

27.028 

27.032 

27.036 

27.040 

27.044 

687 

27.048 

27.052 

27.056 

27.060 

27.063 

27.067 

27.071 

27.075 

27.079 

27.083 

688 

27.087 

27.091 

27.095 

27.099 

27.103 

27.107 

27.111 

27.115 

27.119 

27.123 

689 

27.126 

27.130 

27.134 

27.138 

27.142 

27.146 

27.150 

27.154 

27.158 

27.162 

690 

27.166 

27.170 

27.174 

27.178 

27.182 

27.186 

27.189 

27.193 

27.197 

27.201 

691 

27.205 

27.209 

27.213 

27.217 

27.221 

27.225 

27.229 

27.233 

27.237 

27.241 

692 

27.245 

27.249 

27.252 

27.256 

27.260 

27.264 

27.268 

27.272 

27.276 

27.280 

693 

27.284 

27.288 

27.292 

27.296 

27.300 

27.304 

27.308 

27.312 

27.315 

27.319 

694 

27.323 

27.327 

27.331 

27.335 

27.339 

27.343 

27.347 

27.351 

27.355 

27.359 

695 

27.363 

27.367 

27.371 

27.375 

27.378 

27.382 

27.386 

27.390 

27.394 

27.398 

696 

27.402 

27.406 

27.410 

27.414 

27.418 

27.422 

27.426 

27.430 

27.434 

27.438 

697 

27.441 

27.445 

27.449 

27.453 

27.457 

27.461 

27.465 

27.469 

27.  173 

27.477 

698 

27.481 

27.485 

27.489 

27.493 

27.497 

27.500 

27.504 

27.508 

27.512 

27.516 

699 

27.520 

27.524 

27.528 

27.532 

27.536 

27.540 

27.544 

27.548 

27.552 

27.556 

700 

27.560 

27.563 

27.567 

27.571 

27.575 

27.579 

27.583 

27.587 

27.591 

27.595 

701 

27.599 

27.603 

27.607 

27.611 

27.615 

27.619 

27.623 

27.626 

27.630 

27.634 

702 

27.638 

27.642 

27.646 

27.650 

27.654 

27.658 

27.662 

27.666 

27.670 

27.674 

703 

27.678 

27.682 

27.686 

27.689 

27.693 

27.697 

27.701 

27.705 

27.709 

27.713 

704 

27.717 

27.721 

27.725 

27.729 

27.733 

27.737 

27.741 

27.745 

27.749 

27.752 

705 

27.756 

27.760 

27.764 

27.768 

27.772 

27.776 

27.780 

27.784 

27.788 

27.792 

706 

27.796 

27.800 

27.804 

27.808 

27.812 

27.815 

27.819 

27.823 

27.827 

27.831 

707 

27.835 

27.839 

27.843 

27.847 

27.851 

27.855 

27.859 

27.863 

27.867 

27.871 

708 

27.875 

27.878 

27.882 

27.886 

27.890 

27.894 

27.898 

27.902 

27.906 

27.910 

709 

27.914 

27.918 

27.922 

27.926 

27.930 

27.934 

27.938 

27.941 

27.945 

27.949 

710 

27.953 

27.957 

27.961 

27.965 

27.969 

27.973 

27.977 

27.981 

27.985 

27.989 

711 

27.993 

27.997 

28.001 

28.004 

28.008 

28.012 

28.016 

28.020 

28.024 

28.028 

712 

28.032 

28.036 

28.040 

28.044 

28.048 

28.052 

28.056 

28.060 

28.063 

28.067 

713 

28.071 

28.075 

28.079 

28.083 

28.087 

28.091 

28.095 

28.099 

28.103 

28.107 

714 

28.111 

28.115 

28.119 

28.123 

28.126 

28.130 

28.134 

28.138 

28.142 

28.146 

715 

28.150 

28.154 

28.158 

28.162 

28.166 

28.170 

28.174 

28.178 

28.182 

28.186 

716 

28.189 

28.193 

28.197 

28.201 

28.205 

28.209 

28.213 

28.217 

28.221 

28.225 

717 

28.229 

28.233 

28.237 

28.241 

28.245 

28.249 

28.252 

28.256 

28.260 

28.264 

718 

28.268 

28.272 

28.276 

2S.280 

28.284 

28.288 

28.292 

28.296 

28.300 

28.304 

719 

28.308 

28.312 

28.315 

28.319 

28.323 

28.327 

28.331 

28.335 

28.339 

28.343 

o. 

1. 

2. 

3. 

4. 

5.    6. 

r. 

8. 

9. 

COMPARISON    OF    THE    METRICAL    AND    ENGLISH    BAROMETERS. 
1  Metre  =  39.37079  English  Inches. 


Tenths  of  Millimetres. 

Millime- 

tres. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

720 

28.347 

28.351 

28.355 

28.359 

28.363 

28.367 

28.371 

28.375 

28.378 

28.382 

721 

28.386 

28.390 

28.394 

28.398 

28.402 

28.406 

28.410 

28.414 

28.418 

28.422 

722 

28.426 

28.430 

28.434 

28.438 

28.441 

28.445 

28.449 

28.453 

28.457 

28.461 

723 

28.465 

28.469 

28.473 

28.477 

28.481 

28.485 

28.489 

28.493 

28.497 

28.501 

724 

28.504 

28.508 

28.512 

28.516 

28.520 

28.524 

28.528 

28.532 

28.536 

28.540 

725 

28.544 

28.548 

28.552 

28.556 

28.560 

28.564 

28.567 

28.571 

28.575 

28.579 

726 

28.583 

28.587 

28.591 

28.595 

28.599 

28.603 

28.607 

28.611 

28.615 

28.619 

727 

28.623 

28.627 

28.630 

28.634 

28.638 

28.642 

28.646 

28.650 

28.654 

28.658 

723 

28.662 

28.666 

28.670 

28.674 

28.678 

28.682 

28.686 

28.689 

28.693 

28.697 

729 

28.701 

28.705 

28.709 

28.713 

28.717 

28.721 

28.725 

28.729 

28.733 

28.737 

730 

28.741 

28.745 

28.749 

28.752 

28.756 

28.760 

28.764 

28.768 

28.772 

28.776 

731 

28.780 

28.784 

28.788 

28.792 

28.796 

28.800 

28.804 

28.808 

28.812 

28.815 

732 

28.819 

28.823 

28.827 

28.831 

28.835 

28.839 

28.843 

28.847 

28.851 

28.855 

733 

28.859 

28.863 

28.867 

28.871 

28.875 

28.878 

28.882 

28.886 

28.890 

28.894 

734 

28.898 

28.902 

28.906 

28.910 

28.914 

28.918 

28.922 

28.926 

28.930 

28.934 

735 

28.938 

28.941 

28.945 

28.949 

28.953 

28.957 

28.961 

28.965 

28.969 

28.973 

736 

28.977 

28.981 

28.985 

28.989 

28.993 

28.997 

29.001 

29.004 

29.008 

29.012 

737 

29.016 

29.020 

29.024 

29.028 

29.032 

29.036 

29.040 

29.044 

29.048 

29.052 

738 

29.056 

29.060 

29.064 

29.067 

29.071 

29.075 

29.079 

29.083 

29.087 

29.091 

739 

29.095 

29.099 

29.103 

29.107 

29.111 

29.115 

29.119 

29.123 

29.127 

29.130 

740 

29.134 

29.138 

29.142 

29.146 

29.150 

29.154 

29.158 

29.162 

29.166 

29.170 

741 

29.174 

29.178 

29.182 

29.186 

29.190 

29.193 

29.197 

29.201 

29.205 

29.209 

742 

29.213 

29.217 

29.221 

29.225 

29.229 

29.233 

29.237 

29.241 

29.245 

29.249 

743 

29.252 

29.256 

29.260 

29.264 

29.268 

29.272 

29.276 

29.280 

29.284 

29.288 

744 

29.292 

29.296 

29.300 

29.304 

29.308 

29.312 

29.315 

29.319 

29.323 

29.327 

745 

29.331 

29.335 

29.339 

29.343 

29.347 

29.351 

29.355 

29.359 

29.363 

29.367 

746 

29.371 

29.375 

29.378 

29.382 

29.386 

29.390 

29.394 

29.398 

29.402 

29.406 

747 

29.410 

29.414 

29.418 

29.422 

29.426 

29.430 

29.434 

29.438 

29.441 

29.445 

748 

29.449 

29.453 

29.457 

29.461 

29.465 

29.469 

29.473 

29.477 

29.481 

29.485 

749 

29.489 

29.493 

29.497 

29.501 

29.504 

29.508 

29.512 

29.516 

29.520 

29.524 

750 

29.528 

29.532 

29.536 

29.540 

29.544 

29.548 

29.552 

29.556 

29.560 

29.564 

751 

29.567 

29.571 

29.575 

29.579 

29.583 

29.587 

29.591 

29.595 

29.599 

29.603 

1 

752 

29.607 

29.611 

29.615 

29.619 

29.623 

29.627 

29.630 

29.634 

29.638 

29.642 

753 

29.646 

29.650 

29.654 

29.658 

29.662 

29.666 

29.670 

29.674 

29.678 

29.682 

754 

29.686 

29.690 

29.693 

29.697 

29.701 

29.705 

29.709 

29.713 

29.717 

29.721 

755 

29.725 

29.729 

29.733 

29.737 

29.741 

29.745 

29.749 

29.753 

29.756 

29.760 

756 

29.764 

29.768 

29.772 

29.776 

29.780 

29.784 

29.788 

29.792  29.796 

29.800 

757 

29.804 

29.808 

29.812 

29.815 

29.819 

29.823 

29.827 

29.831  29.835 

29.839 

758 

29.843 

29.847 

29.851 

29.855 

29.859 

29.863 

29.867 

29.871 

29.875 

29.878 

759 

29.882 

29.886 

29.890 

29.894 

29.898 

29.902 

29.906 

m 

29.910 

29.914 

29.918 

O. 

1. 

2. 

3. 

4. 

5. 

6.    7.    8. 

9. 

25 


COMPARISON    OF    THE    METRICAL    AND    ENGLISH    BAROMETERS. 


1  Metre  =  39.37079  English  Inches. 


Tenths  of  Millimetres. 

Millime- 

tres. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

*  8. 

9. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In 

Eng.  In. 

Eng.  In. 

760 

29.922 

29.926 

29.930 

29.934 

29.938 

29.941 

29.945 

29.949 

29.953 

29.957 

761 

29.961 

29.965 

29.969 

29.973 

29.977 

29.981 

29.985 

29.989 

29.993 

29.997 

762 

30.001 

30.004 

30.008 

30.012 

30.016 

30.020 

30.024 

30.028 

30.032 

30.036 

763 

30.040 

30.044 

30.048 

30.052 

30.056 

30.060 

30.064 

30.067 

30.071 

30.075 

764 

30.079 

30.083 

30.087 

30.091 

30.095 

30.099 

30.103 

30.107 

30.111 

30.115 

765 

30.119 

30.123 

30.127 

30.130 

30.134 

30.138 

30.142 

30.146 

30.150 

30.154 

766 

30.158 

30.162 

30.166 

30.170 

30.174 

30.178 

30.182 

30.186 

30.190 

30.193 

767 

30.197 

30.201 

30.205 

30.209 

30.213 

30.217 

30.221 

30.225 

30.229 

30.233 

768 

30.237 

30.241 

30.245 

30.249 

30.253 

30.256 

30.260 

30.264 

30.268 

30.272 

769 

30.276 

30.280 

30.284 

30.288 

30.292 

30.296 

30.300 

30.304 

30.308 

30.312 

770 

30.316 

30.319 

30.323 

30.327 

30.331 

30.335 

30.339 

30.343 

30.347 

30.351 

771 

30.355 

30.359 

30.363 

30.367 

30.371 

30.375 

30.379 

30.382 

30.386 

30.390 

772 

30.394 

30.398 

30.402 

30.406 

30.410 

30.414 

30.418 

30.422 

30.426 

30.430 

773 

30.434 

30.438 

30.441 

30.445 

30.449 

30.453 

30.457 

30.361 

30.465 

30.469 

774 

30.473 

30.477 

30.481 

30.485 

30.489 

30:493 

30.497 

30.501 

30.504 

30.508 

775 

30.512 

30.516 

30.520 

30.524 

30.528 

30.532 

30.536 

30.540 

30.544 

30.548 

776 

30.552 

30.556 

30.560 

30.564 

30.567 

30.571 

30.575 

30.579 

30.583 

30.587 

777 

30.591 

30.595 

30.599 

30.603 

30.607 

30.611 

30.615 

30.619 

30.623 

30.627 

778 

30.630 

30.634 

30.638 

30.642 

30.646 

30.650 

30.654 

30.658 

30.662 

30.666 

779 

30.670 

30.674 

30.678 

30.682 

30.686 

30.690 

30.693 

30.697 

30.701 

30.705 

780 

30.709 

30.713 

30.717 

30.721 

30.725 

30.729 

30.733 

30.737 

30.741 

30.745 

781 

30.749 

30.753 

30.756 

30.760 

30.764 

30.768 

30.772 

30.776 

30.780 

30.784 

782 

30.788 

30.792 

30.796 

30.800 

30.804 

30.808 

30.812 

30.816 

30.819 

30.823 

783 

30.827 

30.*831 

30.835 

30.839 

30.843 

30.847 

30.851 

30.855 

30.859 

30.863 

784 

30.867 

30.871 

30.875 

30.879 

30.882 

30.886 

30.890 

30.894 

30.898 

30.902 

785 

30.906 

30.910 

30.914 

30.918 

30.922 

30.926 

30.930 

30.934 

30.938 

30.942 

786 

30.945 

30.949 

30.953 

30.957 

30.961 

30.965 

30.969 

30.973 

30.977 

30.981 

787 

30.985 

30.989 

30.993 

30.997 

31.001 

31.004 

31.008' 

31.012 

31.016 

31.020 

788 

31.024 

31.028 

31.032 

31.036 

31.040 

31.044 

31.048 

31.052 

31.056 

31.060 

789 

31.064 

31.067 

31.071 

31.075 

31.079 

31.083 

31.087 

31.091 

31.095 

31.099 

790 

31.103 

31.107 

31.111 

31.115 

31.119 

31.123 

31.127 

31.130 

31.134 

31.138 

791 

31.142 

31.146 

31.150 

31.154 

31.158 

31.162 

31.166 

31.170 

31.174 

31.178 

792 

31.182 

31.186 

31.190 

31.193 

31.197 

31.201 

31.205 

31.209 

31.213 

31.217 

793 

31.221 

31.225 

31.229 

31.233 

31.237 

31.241 

31.245 

31.249 

31.253 

31.256 

994 

31.260 

31.264 

31.268 

31.272 

31.276 

31.280 

31.284 

31.288 

31.292 

31.296 

795 

31.300 

31.304 

31.308 

31.312 

31.316 

31.319 

31.323 

31.327 

31.331 

31.335. 

796 

31.339 

31.343 

31.347 

31.351 

31.355 

31.359 

31.363 

31.367 

31.371 

31.375 

797 

31.379 

31.382 

31.386 

31.390 

31.394 

31.398 

31.402 

31.406 

31.410 

31.414 

798 

31.418 

31.422 

31.426 

31.430 

31.434 

31.438 

31.442 

31.445 

31.449 

31.453 

799 

31.457 

31.461 

31.465 

31.469 

31.473 

31.477 

31.481 

31.485 

31.489 

31.493 

800 

31.497 

31.501 

31.505 

31.508 

31.512 

31.516 

31.520 

31.524 

31.528 

31.532 

Hundredths  of  Millimetres. 

0. 

1. 

2. 

,  3.     4.     5.     6.     7.     8. 

9. 

.0000 

.0004 

.0008 

.0012    .0016    .0020    .0024    .0028    .0031 

.0035 

26 


IV.     COMPARISON    OF    THE    METRICAL    AND    OLD    FRENCH    BAROMETERS.  1 

1  Millimetre  =  0.443296  French  or  Paris  Line. 


Millimetres.  Units. 

Millimetres. 

Tens. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

300 

Par  .lines. 
132.99 

Par.lines. 
133.43 

Par.lines. 
133.88 

Par.lines. 
134.32 

Par.lines. 
134.76 

Par.lines. 
135.21 

Par.lines. 
135.65 

Par.lines. 
136.09 

Par.lines. 
136.54 

Par.lines. 
136.98 

310 

137.42 

137.87 

138.31 

138.75 

139.19 

139.64 

140.08 

140.52 

140.97 

141.41 

320 

141.85 

142.30 

142.74 

143.18 

143.63 

144.07 

144.51 

144.96 

145.40 

145.84 

330 

146.29 

146.73 

147.17 

147.62 

148.06 

148.50 

148.95 

149.39 

149.83 

150.28 

340 

150.72 

151.16 

151.61 

152.05 

152.49 

152.94 

153.38 

153.82 

154.27 

154.71 

350 

155.15 

155.60 

156.04 

156.48 

156.93 

157.37 

157.81 

158.26 

158.70 

159.14 

360 

159.59 

160.03 

160.47 

160.92 

161.36 

161.80 

162.25 

162.69 

163.13 

163.58 

370 

164.02 

164.46 

164.91 

165.35 

165.79 

166.24 

166.68 

167.12 

167.57 

168.01 

380 

168.45 

168.90 

169.34 

169.78 

170.23 

170.67 

171.11 

171.56 

172.00 

172.44 

390 

172.89 

173.33 

173.77 

174.22 

174.66 

175.10 

175.55 

175.99 

176.43 

176.88 

400 

177.32 

177.76 

178.20 

178.65 

179.09 

179.53 

179.98 

180.42 

180.86 

181.31 

410 

181.75 

182.19 

182.64 

183.08 

183.52 

183.97 

184.41 

184.85 

185.30 

185.74 

420 

186.18 

186.63 

187.07 

187.51 

187.96 

188.40 

188.84 

189.29 

189.73 

190.17 

430 

190.62 

191.06 

191.50 

191.95 

192.39 

192.83 

193.28 

193.72 

194.16 

194.61 

440 

195.05 

195.49 

195.94 

196.38 

196.82 

197.27 

197.71 

198.15 

198.60 

199.04 

450 

199.48 

199.93 

200.37 

200.81 

201.26 

201.70 

202.14 

202.59 

203.03 

203.47 

460 

203.92 

204.36 

204.80 

205.25 

205.69 

206.13 

206.58 

207.02 

207.46 

207.91 

470 

208.35 

208.79 

209.24 

209.68 

210.12 

210.57 

211.01 

211.45 

211.90 

212.34 

480 

212.78 

213.23 

213.67 

214.11 

214.56 

215.00 

215.44 

215.88 

216.33 

216.77 

490 

217.22 

217.66 

218.10 

218.54 

218.99 

219.43 

219.87 

220.32 

220.76 

221.20 

500 

221.65 

222.09 

222.53 

222.98 

223.42 

223.86 

224.31 

224.75 

225.19 

225.64 

510 

226.08 

226.52 

226.97 

227.41 

227.85 

228.30 

228.74 

229.18 

229.63 

230.07 

520 

230.51 

230.96 

231.40 

231.84 

232.29 

232.73 

233.17 

233.62 

234.06 

234.50 

530 

234.95 

235.39 

235.83 

236.28 

236.72 

237.16 

237.61 

238.05 

238.49 

238.94 

540 

239.38 

239.82 

240.27 

240.71 

241.15 

241.60 

242.04 

242.48 

242.93 

243.37 

550 

243.81 

244.26 

244.70 

245.14 

245.59 

246.03 

246.47 

246.92 

247.36 

247.80 

560 

248.25 

248.69 

249.13 

249.57 

250.01 

250.46 

250.91 

251.35 

251.79 

252.24 

570 

252.68 

253.12 

253.57 

254.01 

254.45 

254.90 

255.34 

255.78 

256.23 

256.67 

580 

257.11 

257.55 

258.00 

258.44 

258.88 

259.32 

259.77 

260.21 

260.66 

261.10 

590 

261.54 

261.99 

262.43 

262.87 

263.32 

263.76 

264.20 

264.65 

265.09 

265.53 

Tenths  of  Millimetres. 

0. 

1. 

2. 

3. 

4.     5.     6.     7.     8. 

9. 

0.000 

0.044 

0.089 

0.133 

0.177    0.222    0.266    0.310    0.355 

0.399 

Hundredths  of  Millimetres. 

0.000 

0.004 

0.009 

0.013 

0.018    0.022    0.027    0.031    0.035 

0.040 

COMPARISON    OF    THE    METRICAL    AND    OLD    FRENCH    BAROMETERS. 
1  Millimetre  =  O.M3296  French  Line. 


Tenths  of  Millimetres. 

Millime- 

tres. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

8. 

9. 

Par.lines. 

Par.lines. 

Par.lines 

Par.lines. 

Par.lines. 

Par.lines 

Par.lines. 

Par.lines 

Par.lines. 

Par.lines. 

600 

265.98 

266.02 

266.07 

266.11 

266.15 

266.20 

266.24 

266.29 

266.33 

266.38 

6.01 

266.42 

266.47 

266.51 

266.55 

266.60 

266.64 

266.69 

266.73 

266.78 

266.82 

602 

266.86 

266.91 

266.95 

267.00 

267.04 

267.09 

267.13 

267.17 

267.22 

267.26 

603 

267.31 

267.35 

267.40 

267.44 

267.48 

267.53 

267.57 

267.62 

267.66 

267.71 

604 

267.75 

267.80 

267.84 

267.88 

267.93 

267.97 

268.02 

268.06 

268.11 

268.15 

605 

268.19 

268.24 

268.28 

268.33 

268.37 

268.42 

268.46 

268.50 

268.55 

268.59 

606 

268.64 

268.68 

268.73 

268.77 

268.81 

268.86 

268.90 

268.95 

268.99 

269.04 

607 

269.08 

269.13 

269.17 

269.21 

269.26 

269.30 

269.35 

269.39 

269.44 

269.48 

608 

269.52 

269.57 

269.61 

269.66 

269.70 

269.75 

269.79 

269.83 

269.88 

269.92 

609 

269.97 

270.01 

270.06 

270.10 

270.14 

270.19 

270.23 

270.28 

270.32 

270.37 

610 

270.41 

270.45 

270.50 

270.54 

270.59 

270.63 

270.68 

270.72 

270.77 

270.81 

611 

270.85 

270.90 

270.94 

270.99 

271.03 

271.08 

271.12 

271.16 

271.21 

271.25 

612 

271.30 

271.34 

271.39 

271.43 

271.47 

271.52 

271.56 

271.61 

271.65 

271.70 

613 

271.74 

271.78 

271.83 

271.87 

271.92 

271.96 

272.01 

272.05 

272.10 

272.14 

614 

272.18 

272.23 

272.27 

272.32 

272.36 

272.41 

272.45 

272.49 

272.54 

272.58 

615 

272.63 

272.67 

272.72 

272.76 

272.80 

272.85 

272.89 

272.94 

272.98 

273.03 

616 

273.07 

273.11 

273.16 

273.20 

273.25 

273.29 

273.34 

273.38 

273.42 

273.47 

617 

273.51 

273.56 

273.60 

273.65 

273.69 

273.74 

273.78 

273.82 

273.87 

273.91 

618 

273.96 

274.00 

274.05 

274.09 

274.13 

274.18 

274.22 

274.27 

274.31 

274.36 

619 

274.40 

274.44 

274.49 

274.53 

274.58 

274.62 

274.67 

274.71 

274.75 

274.80 

620 

274.84 

274.89 

274.93 

274.98 

275.02 

275.07 

275.11 

275.15 

275.20 

275.24 

621 

275.29 

275.33 

275.38 

275.42 

275.46 

275.51 

275.55 

275.60 

275.64 

275.69 

622 

275.73 

275.77 

275.82 

275.86 

275.91 

275.95 

276.00 

276.04 

276.08 

276.13 

623 

276.17 

276.22 

276.26 

276.31 

276.35 

276.38 

276.44 

276.48 

276.53 

276.57 

624 

276.62 

276.66 

276.71 

276.75 

276.79 

276.84 

276.88 

276.93 

276.97 

277.02 

625 

277.06 

277.10 

277.15 

277.19 

277.24 

277.2.8 

277.33 

277.37 

277.41 

277.46 

626 

277.50 

277.55 

277.59 

277.64 

277.58 

277.72 

277.77 

277.81 

277.86 

277.90 

627 

277.95 

277.99 

278.04 

278.08 

278.12 

278.17 

278.21 

278.26 

278.30 

278.35 

628 

278.39 

278.43 

278.48 

278.52 

278.57 

278.61 

278.66 

278.70 

278.74 

278.79 

629 

278.83 

278.88 

278.92 

278.97 

279.01 

279.05 

279.10 

279.14 

279.19 

279.23 

630 

279.28 

279.32 

279.37 

279.41 

279.45 

279.50 

279.54 

279.59 

279.63 

279.68 

631 

279.72 

279.76 

279.81 

279.85 

279.90 

279.94 

279.99 

280.03 

280.07 

280.12 

632 

280.16 

280.21 

280.25 

280.30 

280.34 

280.38 

280.43 

280.47 

280.52 

280.56 

633 

280.61 

280.65 

280.70 

280.74 

280.78 

280.83 

280.87 

280.92 

280.96 

281.01 

634 

281.05 

281.09 

281.14 

281.18 

281.23 

281.27 

281.32 

281.36 

281.40 

281.45 

635 

281.49 

281.54 

281.58 

281.63 

281.67 

281.71 

281.76 

281.80 

281.85 

281.89 

636 

281.94 

281.98 

282.02 

282.07 

282.11 

282.16 

282.20 

282.25 

282.29 

282.34 

637 

282.38 

282.42 

282.47 

282.51 

282.56 

282.60 

282.65 

282.69 

282.73 

282.78 

638 

282.82 

282.87 

282.91 

282.96 

283.00 

283.04 

283.09 

283.13 

283.18 

283.22 

639 

283.27 

283.31 

283.35 

283.40 

283.44 

283.49 

283.53 

283.58 

283.62 

283.67 

0. 

1. 

2. 

3. 

4. 

5. 

6.    7. 

8. 

9. 

COMPARISON    OF    THE    METRICAL    AND    OLD    FRENCH    BAROMETERS. 


1  Millimetre  =  0.443296  French  Line. 


Millime- 

'1 
Tenths  of  Millimetres. 

tres. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Par.lines. 

Par.lines 

Par.lines 

Par.lines. 

Par.lines 

Par.lines 

Par.lines 

Par.lines 

Par.lines 

Par.lines. 

640 

283.71 

283.75 

283.80 

283.84 

283.89 

283.93 

283.98 

284.02 

284.06 

284.11 

641 

284.15 

284.20 

284.24 

284.29 

284.33 

284.37 

284.42 

284.46 

284.51 

284.55 

642 

284.60 

284.64 

284.68 

284.73 

284.77 

284.82 

284.86 

284.91 

284.95 

284.99 

643 

285.04 

285.08 

285.13 

285.17 

285.22 

285.26 

285.31 

285.35 

285.39 

285.44 

644 

285.48 

285.53 

285.57 

285.62 

285.66 

285.70 

285.75 

285.79 

285.84 

285.88 

645 

285.93 

285.97 

286.01 

286.06 

286.10 

286.15 

286.19 

286.24 

286.28 

286.32 

646 

286.37 

286.41 

286.46 

286.50 

286.55 

286.59 

286.64 

286.68 

286.72 

2S6.77 

647 

286.81 

286.86 

286.90 

286.95 

286.99 

287.03 

287.08 

287.12 

287.17 

287.21 

648 

287.26 

287.30 

287.34 

287.39 

287.43 

287.48 

287.52 

287.57 

287.61 

287.65 

649 

287.70 

287.74 

287.79 

287.83 

287.88 

287.92 

287.96 

288.01 

288.05 

288.10 

650 

288.14 

288.19 

288.23 

288.28 

288.32 

288.36 

288.41 

288.45 

288.50 

288.54 

651 

288.59 

288.63 

288.67 

288.72 

288.76 

288.81 

288.85 

288.90 

288.94 

288.98 

652  - 

289.03 

289.07 

289.12 

289.16 

289.21 

289.25 

289.29 

289.34 

289.38 

289.43 

653 

289.47 

289.52 

289.56 

289.61 

289.65 

289.69 

289.74 

289.78 

289.83 

289.87 

654 

289.92 

289.96 

290.00 

290.05 

290.09 

290.14 

290.18 

290.23 

290.27 

290.31 

655 

290.36 

290.40 

290.45 

290.49 

290.54 

290.58 

290.62 

290.67 

290.71 

290.76 

656 

290.80 

290.85 

290.89 

290.94 

290.98 

291.02 

291.07 

291.11 

291.16 

291.20 

657 

291.25 

291.29 

291.33 

291.38 

291.42 

291.47 

291.51 

291.56 

291.60 

291.64 

658 

291.69 

291.73 

291.78 

291.82 

291.87 

291.91 

291.95 

292.00 

292.04 

292.09 

659 

292.13 

292.18 

292.22 

292.26, 

292.31 

292.35 

292.40 

292.44 

292.49 

292.53 

660 

292.58 

292.62 

292.66 

292.71 

292.75 

292.80 

292.84 

292.89 

292.93 

292.97 

661 

293.02 

293.06 

293.11 

293.15 

293.20 

293.24 

293.28 

293.33 

293.37 

293.42 

662 

293.46 

293.51 

293.55 

293.59 

293.64 

293.68 

293.73 

293.77 

293.82 

293.86 

663 

293.91 

293.95 

293.99 

294.04 

294.08 

294.13 

294.17 

294.22 

294.26 

294.30 

664 

294.35 

294.39 

294.44 

294.48 

294.53 

294.57 

294.61 

294.66 

294.70 

294.75 

665 

294.79 

294.84 

294.88 

294.92 

294.97 

295.01 

295.06 

295.10 

295.15 

295.19 

666 

295.24 

295.28 

295.32 

295.37 

295.41 

295.46 

295.50 

295.55 

295.59 

295.63 

667 

295.68 

295.72 

295.77 

295.81 

295.86 

295.90 

295.94 

295.99 

296.03 

296.08 

668 

296.12 

296.17 

296.21 

296.25 

296.30 

296.34 

296.39 

296.43 

296.48 

296.52 

669 

296.56 

296.61 

296.65 

296.70 

296.74 

296.79 

296.83 

296.88 

296.92 

296.96 

670 

297.01 

297.05 

297.10 

297.14 

297.19 

297.23 

297.27 

297,32 

297.36 

297.41 

671 

297.45 

297.50 

297.54 

297.58 

297.63 

297.67 

297.72 

297.76 

297.81 

297.85 

672 

297.89 

297.94 

297.98 

298.03 

298.07 

298.12 

298.16 

298.21 

298.25 

298.29 

673 

298.34 

298.38 

298.43 

298.47 

298.52 

293.56 

298.60- 

298.65 

298.69 

298.74 

674 

298.78 

298.83 

298.87 

298.91 

298.96 

299.00 

299.05 

299.09 

299.14 

299.18 

675 

299.22 

299.27 

299.31 

299.36 

299.40 

299.45 

299.49 

299.54 

299.58 

299.62 

676 

299.67 

299.71 

299.76 

299.80 

299.85 

299.89 

299.93 

299.98 

300.02 

300.07 

677 

300.11 

300.16 

300.20 

300.24 

300.29 

300.33 

300.38 

300.42 

300.47 

300.51 

678 

300.55 

300.60 

300.64 

300.69 

300.73 

300.78 

300.82 

300.86  |  300.91 

300.95 

679 

301.00 

301.04 

301.09 

301.13 

301.18 

301.22 

301.26 

301.31  301.35 

301.40 

O. 

1. 

2. 

3.    4. 

5. 

6. 

?. 

8. 

9. 

COMPARISON    OF    THE    METRICAL    AND    OLD    FRENCH    BAROMETERS. 
1  Millimetre  =  0.443296  French  Line. 


Millime- 
tres. 

Tenths  of  Millimetres. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.liues. 

680 

301.44 

301.49 

301.53 

301.57 

301.62 

301.66 

301.71 

301.75 

301.80 

301.84 

681 

301.88 

301.93 

301.97 

302.02 

302.06 

302.11 

302.15 

302.19 

302.24 

302.28 

6S2 

302.33 

302.37 

302.42 

302.46 

302.51 

302.55 

302.59 

302.64 

302.68 

302.73 

683 

302.77 

302.82 

302.86 

302.90 

302.95 

302.99 

303.04 

303.08 

303.13 

303.17 

684 

303.21 

303.26 

303.30 

303.35 

303.39 

303.44 

303.48 

303.52 

303.57 

303.61 

685 

303.66 

303.70 

303.75 

303.79 

303.83 

303.88 

303.92 

303.97 

304.01 

304.06 

686 

304.10 

304.15 

304.19 

304.23 

304.28 

304.32 

304.37 

304.41 

304.46 

304.50 

687 

304.54 

304.59 

304.63 

304.68 

304.72 

304.77 

304.81 

304.85 

304.90 

304.94 

688 

304.99 

305.03 

305.08 

305.12 

305.16 

305.21 

305.25 

305.30 

305.34 

305.39 

689 

305.43 

305.48 

305.52 

305.56 

305.61 

305.65 

305.70 

305.74 

305.79 

305.83 

• 

690 

305.87 

305.92 

305.96 

306.01 

306.05 

306.10 

306.14 

306.18 

306.23 

306.27 

691 

306.32 

306.36 

306.41 

306.45 

306.49 

306.54 

306.58 

306.63 

306.67 

306.72 

692 

306.76 

306.81 

306.85 

306.89 

306.94 

306.98 

307.03 

307.07 

307.12 

307.16 

693 

307.20 

307.25 

307.29 

307.34 

307.38 

307.43 

307.47 

307.51 

307.56 

307.60 

694 

307.65 

307.69 

307.74 

307.78 

307.82 

307.87 

307.91 

307.96 

308.00 

308.05 

695 

308.09 

308.13 

308.18 

308.22 

308.27 

308.31 

308.36 

308.40 

308.45 

308.49 

696 

308.53 

308.58 

308.62 

308.67 

308.71 

308.76 

308.80 

308.84 

308.89 

308.93 

697 

308.98 

309.02 

309.07 

309.11 

309.15 

309.20 

309.24 

309.29 

309.33 

309.38 

698 

309.42 

309.46 

309.51 

309.55 

309.60 

309.64 

309.69 

309.73 

309.78 

309.82 

699 

309.86 

309.91 

309.95 

310.00 

310.04 

310.09 

310.13 

310.17 

310.22 

310.26 

700 

310.31 

310.35 

310.40 

310.44 

310.48 

310.53 

310.57 

310.62 

310.66 

310.71 

701 

310.75 

310.79 

310.84 

310.88 

310.93 

310.97 

311.02 

311.06 

311.11 

311.15 

702 

311.19 

311.24 

311.28 

311.33 

311.37 

311.42 

311.46 

311.50 

311.55 

311.59 

703 

311.64 

311.68 

311.73 

311.77 

311.81 

311.86 

311.90 

311.95 

311.99 

312.04 

704 

312.08 

312.12 

312.17 

312.21 

312.26 

312.30 

312.35 

312.39 

312.43 

312.48 

705 

312.52 

312.57 

312.61 

312.66 

312.70 

312.75 

312.79 

312.83 

312.88 

312.92 

706 

312.97 

313.01 

313.06 

313.10 

313.14 

313.19 

313.23 

313.28 

313.32 

313.37 

707 

313.41 

313.45 

313.50 

313.54 

313.59 

313.63 

313.68 

313.72 

313.76 

313.81 

708 

313.85 

313.90 

313.94 

313.99 

314.03 

314.08 

314.12 

314.16 

314.21 

314.25 

709 

314.30 

314.34 

314.39 

314.43 

314.47 

314.52 

314.56 

314.61 

314.65 

314.70 

710 

314.74 

314.78 

314.83 

314.87 

314.92 

314.96 

315.01 

315.05 

315.09 

315.14 

711 

315.18 

315.23 

315.27 

315.32 

315.36 

315.41 

315.45 

315.49 

315.54 

315.58 

712 

315.63 

315.67 

315.72 

315.76 

315.80 

315.85 

315.89 

315.94 

315.98 

316.03 

713 

316.07 

316.11 

316.16 

316.20 

316.25 

316.29 

316.34 

316.38 

316.42 

316.47 

714 

316.51 

316.56 

316.60 

316.65 

316.69 

316.73 

316.78 

316.82 

316.87 

316.91 

715 

316.96 

317.00 

317.05 

317.09 

317.13 

317.18 

317.22 

317.27 

317.31 

317.36 

716 

317.40 

317.44 

317.49 

317.53 

317.58 

317.62 

317.67 

317.71 

317.75 

317.80 

717 

317.84 

317.89 

317.93 

317.98 

318.02 

318.06 

318.11 

318.15 

318.20 

318.24 

718 

318.29 

318.33 

318.38 

318.42 

318.46 

318.51 

318.55 

318.60 

318.64 

318.69 

719 

318.73 

318.77 

318.82 

318.86 

318.91 

318.95 

319.00 

319.04 

319.08 

319.13 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7.    8. 

9. 

c 


30 


COMPARISON    OF    THE    METRICAL    AND    OLD    FRENCH    BAROMETERS. 
1  Millimetre  =  0.443296  French  Line. 


Tenths  of  Millimetres. 

Millime- 

tres. 

0. 

1. 

*. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Par.lines.  Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

720 

319.17 

319.22 

319.26 

319.31 

319.35 

319.39 

319.44 

319.48 

319.53 

319.57 

721 

319.62 

319.66 

319.70 

319.75 

319.79 

319.84 

319.88 

319.93 

319.97 

320.02 

722 

320.06 

320.10 

320.15 

320.19 

320.24 

320.28 

320.33 

320.37 

320.41 

320.46 

723 

320.50 

320.55 

320.59 

320.64 

320.68 

320.72 

320.77 

320.81 

320.86 

320.90 

724 

320.95 

320.99 

321.03 

321.08 

321.12 

321.17 

321.21 

321.26 

321.30 

321.35 

725 

321.39 

321.43 

321.48 

321.52 

321.57 

321.61 

321.66 

321.70 

321.74 

321.79 

726 

321.83 

321.88 

321.92 

321.97 

322.01 

322.05 

322.10 

322.14 

322.19 

322.23 

727 

322.28 

322.32 

322.36 

322.41 

322.45 

322.50 

322.54 

322.59 

322.63 

322.68 

728 

322.72 

322.76 

322.81 

322.85 

322.90 

322.94 

322.99 

323.03 

323.07 

323.12 

729 

323.16 

323.21 

323.25 

323.30 

323.34 

323.38 

328.43 

323.47 

323.52 

323.56 

730 

323.61 

323.65 

323.69 

323.74 

323.78 

323.83 

323.87 

323.92 

323.96 

324.00 

731 

324.05 

324.09 

324.14 

324.18 

324.23 

324.27 

324.32 

324.36 

324.40 

324.45 

732 

324.49 

324.54 

324.58 

324.63 

324.67 

324.71 

324.76 

324.80 

324.85 

324.89 

733 

324.94 

324.98 

325.02 

325.07 

325.11 

325.16 

325.20 

325.25 

325.29 

325.33 

734 

325.38 

325.42 

325.47 

325.51 

325.56 

325.60 

325.65 

325.69 

325.73 

325.78 

735 

325.82 

325.87 

325.91 

325.96 

326.00 

326.04 

326.09 

326.13 

326.18 

326.22 

736 

326.27 

326.31 

326.35 

326.40 

326.44 

326.49 

326.53 

326.58 

326.62 

326.66 

737 

326.71 

326.75 

326.80 

326.84 

326.89 

326.93 

326.98 

327.02 

327.06 

327.11 

738 

327.15 

327.20 

327.24 

327.29 

327.33 

327.37 

327.42 

327.46 

327.51 

327.55 

739 

327.60 

327.64 

327.68 

327.73 

327.77 

327.82 

327.86 

327.91 

327.95 

327.99 

740 

328.04 

328.08 

328.13 

328.17 

328.22 

328.26 

328.30 

328.35 

328.39 

328.44 

741 

328.48 

328.53 

328.57 

328.62 

328.66 

328.70 

328.75 

328.79 

328.84 

328.88 

742 

328.93 

328.97 

329.01 

329.06 

329.10 

329.15 

329.19 

329.24 

329.28 

329.32 

743 

329.37 

329.41 

329.46 

329.50 

329.55 

329.59 

329.63 

329.68 

329.72 

329.77 

744 

329.81 

329.86 

329.90 

329.95 

329.99 

330.03 

330.08 

330.12 

330.17 

330.21 

745 

330.26 

330.30 

330.34 

330.39 

330.43 

330.48 

330.52 

330.57 

330.61 

330.65 

746 

330.70 

330.74 

330.79 

330.83 

330.88 

330.92 

330.96 

331.01 

331.05 

331.10 

747 

331.14 

331.19 

331.23 

331.28 

331.32 

331.36 

331.41 

331.45 

331.50 

331.54 

748 

331.59 

331.63 

331.67 

331.72 

331.76 

331.81 

331.85 

331.90 

331.94 

331.98 

749 

332.03 

332.07 

332.12 

332.16 

332.21 

332.25 

332.29 

332.34 

332.38 

332.43 

750 

332.47 

332.52 

332.56 

332.60 

332.65 

332.69 

332.74 

332.78 

332.83 

332.87 

751 

332.92 

332.96 

333.00 

333.05 

333.09 

333.14 

333.18 

333.23 

333.27 

333.31 

752 

333.36 

333.40 

333.45 

333.49 

333.54 

333.58 

333.62 

333.67 

333.71 

333.76 

753 

333.80 

333.85 

333.89 

333.93 

333.98 

334.02 

334.07 

334.11 

334.16 

334.20 

754 

334.25 

334.29 

334.33 

334.38 

334.42 

334.47 

334.51 

334.56 

334.60 

334.64 

755 

334.69 

334.73 

334.78 

334.82 

334.87 

334.91 

334.95 

335.00 

335.04 

335.09 

756 

335.13 

335.18 

335.22 

335.26 

335.31 

335.35 

335.40 

335.44 

335.49 

335.53 

757 

335.58 

'335.62 

335.66 

335.71 

335.75 

335.80 

335.84 

335.89 

335.93 

335.97 

758 

336.02 

336.06 

336.11 

336.15 

336.20 

336.24 

336.28 

336.33 

336.37 

336.42 

759 

336.46 

336.51 

336.55 

336.59 

3:^6.64 

336.68 

336.73 

336.77 

336.82 

336.86 

O. 

1. 

2. 

3.    4. 

5. 

6. 

•7. 

8. 

9. 

31 


COMPARISON    OF    THE    METRICAL    AND    OLD    FRENCH    BAROMETERS. 
1  Millimetre  =  0.443296  French  Line. 


Millime- 
tres. 

Tenths  of  Millimetres. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

8. 

9. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines. 

Par.lines.  Par.lines. 

Par.lines. 

Par.lines. 

760 

336.90 

336.95 

336.99 

337.04 

337.08 

337.13 

337.17 

337.22 

337.26 

337.30 

761 

337.35 

337.39 

337.44 

337.48 

337.53 

337.57 

337.61 

337.66 

337.70 

337.75 

762 

337.79 

337.84 

337.88 

337.92 

337.97 

338.01 

338.06 

338.10 

338.15 

338.19 

763 

338.23 

338.28 

338.32 

338.37 

338.41 

338.46 

338.50 

338.55 

338.59 

338.63 

764 

338.68 

338.72 

338.77 

338.81 

338.86 

338.90 

338.94 

338.99 

339.03 

339.08 

765 

339.12 

339.17 

339.21 

339.25 

339.30 

339.34 

339.39 

339.43 

339.48 

339.52 

766 

339.56 

339.61 

339.65 

339.70 

339.74 

339.79 

339.83 

339.87 

339.92 

339.96 

767 

340.01 

340.05 

340.10 

340.14 

340.19 

340.23 

340.27 

340.32 

340.36 

340.41 

768 

340.45 

340.50 

340.54 

340.58 

340.63 

340.67 

340.72 

340.76 

340.81 

340.85 

769 

340.89 

340.94 

340.98 

341.03 

341.07 

341.12 

341.16 

341.20 

341.25 

341.29 

770 

341.34 

341.38 

341.43 

341.47 

341.52 

341.56 

341.60 

341.65 

341.69 

341.74 

771 

341.78 

341.83 

341.87 

341.91 

341.96 

342.00 

342.05 

342.09 

342.14 

342.18 

772 

342.22 

342.27 

342.31 

342.36 

342.40 

342.45 

342.49 

342.53 

342.58 

342.62 

773 

342.67 

342.71 

342.76 

342.80 

342.85 

842.89 

342.93 

342.98 

343.02 

343.07 

774 

343.11 

343.16 

343.20 

343.24 

343.29 

343.33 

343.38 

343.42 

343.47 

343.51 

775 

343.55 

343.60* 

343.64 

343.69 

343.73 

343.78 

343.82 

343.86 

343.91 

343.95 

776 

344.00 

344.04 

344.09 

344.13 

344.17 

344.22 

344.26 

344.31 

344.35 

344.40 

777 

344.44 

344.49 

344.53 

344.57 

344.62 

344.66 

344.71 

344.75 

344.80 

344.84 

778 

344.88 

344.93 

344.97 

345.02 

345.06 

345.11 

345.15 

345.19 

345.24 

345.28 

779 

345.33 

345.37 

345.N42 

345.46 

345.50 

345.55 

345.59 

345.64 

345.68 

345.73 

780 

345.77 

345.82 

345.86 

345.90 

345.95 

345.99 

346.04 

346.08 

346.13 

346.17 

781 

346.21 

346.26 

346.30 

346.35 

346.39 

346.44 

346.48 

346.52 

346.57 

346.61 

782 

346.66 

346.70 

346.75 

346.79 

346.83 

346.88 

346.92 

346.97 

347.01 

347.06 

783 

347.10 

347.15 

347.19 

347.23 

347.28 

347.32* 

347.37 

347.41 

347.46 

347.50 

784 

347.54 

347.59 

347.63 

347.68 

347.72 

347.77 

347.81 

347.85 

347.90 

347.94 

785 

347.99 

348.03 

348.08 

348.12 

348.16 

348.21 

348.25 

348.30 

348.34 

348.39 

786 

348.43 

348.47 

348.52 

348.56 

348.61 

348.65 

348.70 

348.74 

348.79 

348.83 

787 

348.87 

348.92 

348.96 

349.01 

349.05 

349.10 

349.14 

349.18 

349.23 

349.27 

788 

349.32 

349.36 

349.41 

349.45 

349.49 

349.54 

349.58 

349.63 

349.67 

349.72 

789 

349.76 

349.80 

349.85 

349.89 

349.94 

349.98 

350.03 

350.07 

350.12 

350.16 

790 

350.20 

350.25 

350.29 

350.34 

350.38 

350.43 

350.47 

350.51 

350.56 

350.60 

791 

350.65 

350.69 

350.74 

350.78 

350.82 

350.87 

350.91 

350.96 

351.00 

351.05 

792 

351.09 

351.13 

351.18 

351.22 

351.27 

351.31 

351.36 

351.40 

351.44 

351.49 

793 

351.53 

351.58 

351.62 

351.67 

351.71 

351.76 

351.80 

351.84 

351.89 

351.93 

794 

351.98 

352.02 

352.07 

352.11 

352.15 

352.20 

352.24 

352.29 

352.33 

352.38 

795 

352.42 

352.46 

352.51 

352.55 

352.60 

352.64 

352.69 

352.73 

352.77 

352.82 

796 

352.86 

352.91 

352.95 

353.00 

353.04 

353.09 

353.13 

353.17 

353.22 

353.26 

797 

353.31 

353.35 

353.40 

353.44 

353.48 

353.53 

353.57 

353.62 

353.66 

353.71 

798 

353.75 

353.79 

353.84 

353.88 

353.93 

353.97 

354.02 

354.06 

354.10 

354.15 

799 

354.19 

354.24 

354.28 

354.33 

354.37 

354.42 

354.46 

354.50 

354.55 

354.59 

800 

354.64 

354.68 

354.73 

354.77 

354.81 

354.86 

354.90 

354.95 

354.99 

355.04 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

32 


V.-VI. 

COMPARISON 


OF 


THE    OLD    FRENCH    BAROMETER 


WITH 


THE    ENGLISH    AND    THE    METRICAL    BAROMETERS, 


OR 


TABLES 

FOB,   CONVERTING   FRENCH   OR   PARIS    LINES    INTO   ENGLISH  INCHES 
AND   DECIMALS,   AND   INTO   MILLIMETRES; 

GIVING    THE    VALUES    CORRESPONDING    TO    EVERY   PARIS    LINE   FROM    120    TO    216 

LINES,    OR    FROM    10    TO    18    INCHES  ;   AND    TO    EVERY   TENTH    OF   A   LINE 

FROM   216    TO    348    LINES,    OR   FROM   IB    TO    29   FRENCH   INCHES. 


33 


TABLE    V. 

MM.  J.  J.  Pohl  and  J.  Schabus  have  published,  in  the  number  for  March,  1852, 
of  the  Proceedings  of  the  Imperial  Academy  of  Vienna,  Class  of  Mathematics  and 
Natural  Philosophy,  a  set  of  short  Thermometrical  and  Barometrical  Reduction 
Tables,  among  which  is  found  a  table  for  the  reduction  of  the  Old  French  Baro- 
metrical Scale  into  the  English.  As  this  table  shows  slight  discrepancies  from  the 
one  given  in  the  following  pages,  it  may  not  be  out  of  place  to  state  that  they  arise 
from  an  accidental  error  in  the  equation  used  by  MM.  Pohl  and  Schabus  in  com- 
puting their  table.  Adopting,  as  they  do,  Bird's  value  of  the  metre,  viz. 

1  metre  =  39.37062  English  inches, 
the  value  of  the  Paris  line  is 

1  Paris  line  =  0.088813  English  inches. 
But  the  table  seems  to  have  been  computed  by  using  the  equation 

1  Paris  line  =  0.088823  English  inches, 
which  gives,  at  the  end  of  the  table, 

348  lines  X  .088823  =  30.9104  English  inches, 
instead  of 

348    "      X  .088813  =  30.9069 


thus  causing  an  error  =    0.0035 

which,  of  course,  gradually  diminishes  in  lower  numbers. 


34 


V.       COMPARISON    OF    THE    OLD    FRENCH    AND    ENGLISH    BAROMETERS. 

| 

1  Paris  Line  =  0.088814  English  Inch, 


French  or 
Paris 

Lines. 

Tens. 

! 
Units. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

10  Inch. 
120 

Eng.  In. 
10.658 

Eng  In. 
10.746 

Eng.  In. 
10.835 

Eng.  In. 
10.924 

Eng  In 
11.013 

Eng.  In. 
11.102 

Eng.  In. 
11.191 

Eng.  In. 
11.279 

Eng.  In. 
11.368 

Eng.  In. 
11.457 

130 

11.546 

11.635 

11.723 

11.812 

11.901 

11.990 

12.079 

12.168 

12.256 

12.345 

140 

12.434 

12.523 

12.612 

12.700 

12.789 

12.878 

12.967 

13.056 

13.144 

13.233 

150 

13.322 

13.411 

13.500 

13.589 

13.677 

13.766 

13.855 

13.944 

14.033 

14.121 

160 

14.210 

14.299 

14.388 

14.477 

14.565 

14.654 

14.743 

14.832 

14.921 

15.010 

170 

15.098 

15.187 

15.276 

15.365 

15.454 

15.542 

15.631 

15.720 

15.809 

15.898 

180 

15.987 

16.075 

16.164 

16.253 

16.342" 

16.431 

16.519 

16.608 

16.697 

16.786 

190 

16.875 

16.963 

17.052 

17.141 

17.230 

17.319 

17.408 

17.496 

17.585 

17.674 

200 

17.763 

17.852 

17.940 

18.029 

18.118 

18.207 

18.296 

18.384 

18.473 

18.562 

210 

18.651 

18.740 

18.829 

18.917 

19.006 

19.095 

19.184 

19.273 

19.361 

19.450 

Paris 
Lines. 

Tenths. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

18  Inch. 
216 

Eng.  In. 
19.184 

Eng.  In. 
19.193 

Eng.  In. 
19.202 

Eng  In. 
19.210 

Eng.  In. 
19.219 

Eng.  In. 
19.228 

Eng.  In. 
19.237 

Eng.  In. 
19.246 

Eng.  In. 
19.255 

Eng.  In 
19.264 

217 

19.273 

19.282 

19.290 

19.299 

19.308 

19.317 

19.326 

19.335 

19.344 

19.353 

218 

19.361 

19.370 

19.379 

19.388 

19.397 

19.406 

19.415 

19.424 

19.433 

19.441 

219 

19.450 

19.459 

19.468 

19.477 

19.486 

19.495 

19.504 

19.512 

19.521 

19.530 

220 

19.539 

19.548 

19.557 

19.566 

19.575 

19.583 

19.592 

19.601 

19.610 

19.619 

221 

19.628 

19.637 

19.646 

19.655 

19.663 

19.672 

19.681 

19.690 

19.699 

19.708 

222 

19.717 

19.726 

19.734 

19.743 

19.752 

19.761 

19.770 

19.779 

19.788 

19.797 

223 

19.806 

19.814 

19.823 

19.832 

19.840 

19.850 

19.859 

19.868 

19.877 

19.885 

224 

19.894 

19.903 

19.912 

19.921 

19.930 

19.939 

19.948 

19.957 

19.965 

19.974 

225 

19.983 

19.992 

20.001 

20.010 

20.019 

20.028 

20.036 

20.045 

20.054 

20.063 

226 

20.072 

20.081 

20.090 

20.099 

20.107 

20.116 

20.125 

20.134 

20.143 

20.152 

227 

20.161 

20.170 

20.179 

20.187 

20.196 

20.205 

20.214 

20.223 

20.232 

20.241 

19  Inch. 

228 

20.250 

20.258 

20.267 

20.276 

20.285 

20.294 

20.303 

20.312 

20.321 

20.330 

229 

20.338 

20.347 

20.356 

20.365 

20.374 

20.383 

20.392 

20.401 

20.409 

20.418 

230 

20.427 

20.436 

20.445 

20.454 

20.463 

20.472 

20.481 

20.489 

20.498 

20.507 

231 

20.516 

20.525 

20.534 

20.543 

20.552 

20.560 

20.569 

20.578 

20.587 

20.596 

232 

20.605 

20.614 

20.623 

20.631 

20.640 

20.649 

20.658 

20.667 

20.676 

20.685 

233 

20.694 

20.703 

20.711 

20.720 

20.729 

20.738 

20.747 

20.756 

20.765 

20.774 

234 
235 

20.782 
20.871 

20.791 

20.880 

20.800 
20.889 

20.809 

20.898 

20.818 
20.907 

20.827 
20.916 

20.836 
20.925 

20.845 
20.933 

20.854 
20.942 

20.862 
20.951 

236 

20.960 

20.969 

20.978 

20.987 

20.996 

21.005 

21.013 

21.022 

21.031 

21.040 

237 

21.049 

21.058 

21.067 

21.076 

21.084 

21.093 

21.102 

21.111 

21.120 

21.129 

23S 

21.138 

21.147 

21.155 

21.164 

21.173 

21.182 

21.191 

21.200 

21.209 

21.218 

239 

21.227 

21.235 

21.244 

21.253 

21.262 

21.271 

21.280 

21.289 

21.298 

21.306 

Hundredths  of  a  Line. 

0. 

1. 

2. 

3.     4.     5.     6.     7.     8. 

9. 

.000 

.001     .002 

.003    .004    .004    .005    .006     .007 

.008 

35 


COMPARISON    OF    THE    OLD    FRENCH    AND    ENGLISH    BAROMETERS. 
I 

1  Paris  Line  =  0.088814  English  Inch. 


Tenths  of  a  Line. 

French  or 

ParisLines. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

*' 

8. 

9. 

30  Inches. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

240 

21.315 

21.324 

21.333 

21.342 

21.351 

21.360 

21.369 

21.378 

21.386 

21.395 

241 

21.404 

21.413 

21.422 

21.431 

21.440 

21.449 

21.457 

21.466 

21.475 

21.484 

242 

21.493 

21.502 

21.511 

21.520 

21.529 

21.537 

21.546 

21.555 

21.564 

21.573 

243 

21.582 

21.591 

21.600 

21.608 

21.617 

21.626 

21.635 

21.644 

21.653 

21.662 

244 

21.671 

21.679 

21.688 

21.697 

21.706 

21.715 

21.724 

21.733 

21.742 

21.751 

245 

21.759 

21.768 

21.777 

21.786 

21.795 

21.804 

21.813 

21.822 

21.830 

21.839 

246 

21.848 

21.857 

21.866 

21.875 

21.884 

21.893 

21.902 

21.910 

21.919 

21.928 

247 

21.937 

21.946 

21.955 

21.964 

21.973 

21.981 

21.990 

21.999 

22.008 

22.017 

248 

22.026 

22.035 

22.044 

22.053 

22.061 

22.070 

22.079 

22.088 

22.097 

22.106 

249 

22.115 

22.124 

22.132 

22.141 

22.150 

22.159 

22.168 

22.177 

22.186 

22.195 

250 

22.203 

22.212 

22.221 

22.230 

22.239 

22.248 

22.257 

22.266 

22.275 

22.283 

251 

22.292 

22.301 

22.310 

22.319 

22.328 

22.337 

22.346 

22.354 

22.363 

22.372 

31  In.  = 

252 

22.381 

22.390 

22.399 

22.408 

22.417 

22.426 

22.434 

22.443 

22.452 

22.461 

253 

22.470 

22.479 

22.488 

22.497 

22.505 

22.514 

22.523 

22.532 

22.541 

22.550 

254 

22.559 

22.568 

22.577 

22.585 

22.594 

22.603 

22.612 

22.621 

22.630 

22.639 

255 

22.648 

22.656 

22.665 

22.674 

22.683 

22.692 

22.701 

22.710 

22.719 

22.728 

256 

22.736 

22.745 

22.754 

22.763 

22.772 

22.781 

22.790 

22.799 

22.807 

22.816 

257 

22.825 

22.834 

22.843 

22.852 

22.861 

22.870 

22.878 

22.887 

22.896 

22.905 

258 

22.914 

22.923 

22.932 

22.941 

22.950 

22.958 

22.967 

22.976 

22.985 

22.994 

259 

23.003 

23.012 

23.021 

23.029 

23.038 

23.047 

23.056 

23.065 

23.074 

23.083 

260 

23.092 

23.101 

23.109 

23.118 

23.127 

23.136 

23.145 

23.154 

23.163 

23.172 

261 

23.180 

23.189 

23.198 

23.207 

23.216 

23.225. 

23.234 

23.243 

23.252 

23.260 

262 

23.269 

23.278 

23.287 

23.296 

23.305 

23.314 

23.323 

23.331 

23.340 

23.349 

263 

23.358 

23.367 

23.376 

23.385 

23.394 

23.402 

23.411 

23.420 

23.429 

23.438 

264 

23.447 

23.456 

23.465 

23.474 

23.482 

23.491 

23.500 

23.509 

23.518 

23.527 

265 

23.536 

23.545 

23.553 

23.562 

23.571 

23.580 

23.589 

23.598 

23.607 

23.616 

266 

23.625 

23.633 

23.642 

23.651 

23.660 

23.669 

23.678 

23.687 

23.696 

23.704 

267 

23.713 

23.722 

23.731 

23.740 

23.749 

23.758 

23.767 

23.776 

23.784 

23.793 

268 

23.802 

23.811 

23.820 

23.829 

23.838 

23.847 

23.855 

23.864 

23.873 

23.882 

269 

23.891 

23.900 

23.909 

23.918 

23.926 

23.935 

23.944 

23.953 

23.962 

23.971 

270 

23.980 

23.989 

23.998 

24.006 

24.015 

24.024 

24.033 

24.042 

24.051 

24.060 

271 

24.069 

24.077 

24.086 

24.095 

24.104 

24.113 

24.122 

24.131 

24.140 

24.149 

272 

24.157 

24.166 

24.175 

24.184 

24.193 

24.202 

24.211 

24.220 

24.228 

24.237 

273 

24.246 

24.255 

24.264 

24.273 

24.282 

24.291 

24.300 

24.308 

24.317 

24.326 

274 

24.335 

24.344 

24.353 

24.362 

24.371 

24.379 

24.388 

24.397 

24.406 

24.415 

275 

24.424 

24.433 

24.442 

24.450 

24.459 

24.468 

24.477 

24.486 

24.495 

24.504 

Hundredths  of  a  Line. 

O. 

1. 

2. 

3.     4.     5.     6.     7.     8. 

9. 

.0000 

.0009 

.0018 

.0027    .0036    .0044   .0053    .0062    .0071 

.0080 

36 


COMPARISON    OF    THE    OLD    FRENCH    AND   ENGLISH    BAROMETERS. 
1  Paris  Line  =  0.088814  English  Inch. 


Tenths  of  a  Line. 

French  or 

ParisLines. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

33  Inches. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eug.  In. 

Eng.  In. 

276 

24.513 

24.522 

24.530 

24.539 

24.548 

24.557 

24.566 

24.575 

24.584 

24.593 

277 

24.601 

24.610 

24.619 

24.628 

24.637 

24.646 

24.655 

24.664 

24.673 

24.681 

278 

24.690 

24.699 

24.703 

24.717 

24.726 

24.735 

24.744 

24.752 

24.761 

24.770 

279 

24.779 

24.788 

24.797 

24.806 

24.815 

24.824 

24.832 

24.841 

24.850 

24.859 

280 

24.868 

24.877 

24.886 

24.895 

24.903 

24.912 

24.921 

24.930 

24.939 

24.948 

231 

24.957 

24.966 

24.974 

24.983 

24.992 

25.001 

25.010 

25.019 

25.028 

25.037 

282 

25.046 

25.054 

25.063 

25.072 

25.081 

25.090 

25.099 

25.108 

25.117 

25.125 

283 

25.134 

25.143 

25.152 

25.161 

25.170 

25.179 

25.188 

25.197 

25.205 

25.214 

284 

25.223 

25.232 

25.241 

25.250 

25.259 

25.268 

25.276 

25.285 

25.294 

25.303 

285 

25.312 

25.321 

25.330 

25.339 

25.348 

25.356 

25.365 

25.374 

25.383 

25.392 

286 

25.401 

25.410 

25.419 

25.427 

25.436 

25.445 

25.454 

25.463 

25.472 

25.481 

287 

25.490 

25.498 

25.507 

25.516 

25.525 

25.534 

25.543 

25.552 

25.561 

25.570 

3*  In.  = 

288 

25.578 

25.587 

25.596 

25.605 

25.614 

25.623 

25.632 

25.641 

25.649 

25.658 

289 

25.667 

25.676 

25.685 

25.694 

25.703 

25.712 

25.721 

25.729 

25.738 

25.747 

290 

25.756 

25.765 

25.774 

25.783 

25.792 

25.800 

25.809 

25.818 

25.827 

25.836 

291 

25.845 

25.854 

25.863 

25.872 

25.880 

25.889 

25.893 

25.907 

25.916 

25.925 

292 

25.934 

25.943 

25.951 

25.960 

25.969 

25.978 

25.987 

25.996 

26.005 

26.014 

293 

26.023 

26.031 

26.040 

26.049 

26.058 

26.067 

26.076 

26.085 

26.094 

26.102 

294 

26.111 

26.120 

26.129 

26.138 

26.147 

26.156 

26.165 

26.173 

26.182 

26.191 

295 

26.200 

26.209 

26.218 

26.227 

26.236 

26.245 

26.253 

26.262 

26.271 

26.280 

296 

26.289 

26.298 

26.307 

26.316 

26.324 

26.333 

26.342 

26.351 

26.360 

26.369 

297 

26.378 

26.387 

26.396 

26.404 

26.413 

26.422 

26.431 

26.440 

26.449 

26.458 

293 

26.467 

26.475 

26.484 

26.493 

26.502 

26.511 

26.520 

26.529 

26.538 

26.547 

299 

26.555 

26.564 

26.573 

26.582 

26.591 

26.600 

26.609 

26.618 

26.626 

26.635 

35  In.  = 

300 

26.644 

26.653 

26.662 

26.671 

26.680 

26.689 

26.697 

26.706 

26.715 

26.724 

301 

26.733 

26.742 

26.751 

26.760 

26.769 

26.777 

26.786 

26.795 

26.804 

26.813 

302 

26.822 

26.831 

26.840 

26.848 

26.857 

26.866 

26.875 

26.884 

26.893 

26.902 

303 

26.911 

26.920 

26.928 

26.937 

26.946 

26.955 

26.964 

26.973 

26.982 

26.991 

304 

26.999 

27.008 

27.017 

27.026 

27.035 

27.044 

27.053 

27.062 

27.071 

27.079 

305 

27.083 

27.097 

27.106 

27.115 

27.124 

27.133 

27.142 

27.150 

27.159 

27.168 

306 

27.177 

27.186 

27.195 

27.204 

27.213 

27.221 

27.230 

27.239 

27.248 

27.257 

307 

27.266 

27.275 

27.284 

27.293 

27.301 

27.310 

27.319 

27.328 

27.337 

27.346 

303 

27.355 

27.364 

27.372 

27.381 

27.390 

27.399 

27.408 

27.417 

27.426 

27.435 

309 

27.444 

27.452 

27.461 

27.470 

27.479 

27.488 

27.497 

27.506 

27.515 

27.523 

310 

27.532 

27.541 

27.550 

27.559 

27.568 

27.577 

27.586 

27.595 

27.603 

27.612 

311 

27.621 

27.630 

27.639 

27.648 

27.657 

27.666 

27.674 

27.683 

27.692 

27.701 

Ilundredths  of  a  Line. 

0.     1. 

2. 

3.     4.     5.     6.     7.     8. 

9. 

.0000   .0009 

.0018 

.0027    .0036    .0044   .0053    .0062    .0071 

.0080 

37 


COMPARISON    OF    THE    OLD    FRENCH    AND    ENGLISH    BAROMETERS. 
1  Paris  Line  =  0.088814  English  Inch. 


Tenths  of  a  Line. 

French  or 

ParisLines. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

36  Inches. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In 

Eng.  In. 

Eng.  In. 

Eng.  In. 

312 

27.710 

27.719 

27.728 

27.737 

27.745 

27.754 

27.763 

27.772 

27.781 

27.790 

313 

27.799 

27.808 

27.817 

27.825 

27.834 

27.843 

27.852 

27.861 

27.870 

27.879 

314 

27.888 

27.896 

27.905 

27.914 

27.923 

27.932 

27.941 

27.950 

27.959 

27.968 

315 

27.976 

27.985 

27.994 

28.003 

28.012 

28.021 

28.030 

28.039 

28.047 

28.056 

316 

28.065 

28.074 

28.083 

28.092 

28.101 

28.110 

28.119 

28.127 

28.136 

28.145 

317 

28.154 

28.163 

28.172 

28.181 

28.190 

28.198 

28.207 

28.216 

28.225 

28.234 

318 

28.243 

28.252 

28.261 

28.269 

28.278 

28.287 

28.296 

28.305 

28.314 

28.323 

319 

28.332 

28.341 

28.349 

28.358 

28.367 

28.376 

28.385 

28.394 

28.403 

28.412 

320 

28.420 

28.429 

28.438 

28.447 

28.456 

28.465 

28.474 

28.483 

28.492 

28.500 

321 

28.509 

28.518 

28.527 

28.536 

28.545 

28.554 

28.563 

28.571 

28.580 

28.589 

322 

28.598 

28.607 

28.616 

28.625 

28.634 

28.643 

28.651 

28.660 

28.669 

28.678 

323 

28.687 

28.696 

28.705 

28.714 

28.722 

28.731 

28.740 

28.749 

28.758 

28.767 

324 

28.776 

28.785 

28.793 

28.802 

28.811 

28.820 

28.829 

28.838 

28.847 

28.856 

325 

28.865 

28.873 

28.882 

28.891 

28.900 

28.909 

28.918 

28.927 

28.936 

28.944 

326 

28.953 

28.962 

28.971 

28.980 

28.989 

28.998 

29.007 

29.016 

29.024 

29.033 

327 

29.042 

29.051 

29.060 

29.069 

29.078 

29.087 

29.095 

29.104 

29.113 

29.122 

328 

29.131 

29.140 

29.149 

29.158 

29.167 

29.175 

29.184 

29.193 

29.202 

29.211 

329 

29.220 

29.229 

29.238 

29.246 

29.255 

29.264 

29.273 

29.282 

29.291 

29.300 

330 

29.309 

29.318 

29.326 

29.335 

29.344 

29.353 

29.362 

29.371 

29.380 

29.389 

331 

29.397 

29.406 

29.415 

29.424 

29.433 

29.442 

29.451 

29.460 

29.468 

29.477 

332 

29.4S6 

29.495 

29.504 

29.513 

29.522 

29.531 

29.540 

29.548 

29.557 

29.566 

333 

29.575 

29.584 

29.593 

29.602 

29.611 

29.619 

29.628 

29.637 

29.646 

29.655 

334 

29.664 

29.673 

29.682 

29.691 

29.699 

29.708 

29.717 

29.726 

29.735 

29.744 

335 

29.753 

29.762 

29.770 

29.779 

29.788 

29.797 

29.806 

29.815 

29.824 

29.833 

38  In.  = 

336 

29.842 

29.850 

29.859 

29.868 

29.877 

29.886 

29.895 

29.904 

29.913 

29.921 

337 

29.930 

29.939 

29.948 

29.957 

29.966 

29.975 

29.984 

29.992 

30.001 

30.010 

338 

30.019 

30.028 

30.037 

30.046 

30.055 

30.064 

30.072 

30.081 

30.090 

30.099 

339 

30.108 

30.117 

30.126 

30.135 

30.143 

30.152 

30.161 

30.170 

30.179 

30.188 

340 

30.197 

30.206 

30.215 

30.223 

30.232 

30.241 

30.250 

30.259 

30.268 

30.277 

341 

30.286 

30.294 

30.303 

30.312 

30.321 

30.330 

30.339 

30.348 

30.357 

30.366 

342 

30.374 

30.383 

30.392 

30.401 

30.410 

30.419 

30.428 

30.437 

30.445 

30.454 

343 

30.463 

30.472 

30.481 

30.490 

30.499 

30.508 

30.516 

30.525 

30.534 

30.543 

344 

30.552 

30.561 

30.570 

30.579 

30.588 

30.596 

30.605 

30.614 

30.623 

30.632 

345 

30.641 

30.650 

30.659 

30.667 

30.676 

30.685 

30.694 

30.703 

30.712 

30.721 

346 

30.730 

30.739 

30.747 

30.756 

30.765 

30.774 

30.783 

30.792 

30.801 

39.810 

347 

30.818 

30.827 

30.836 

30.845 

30.854 

30.863 

30.872 

30.881 

30.890 

30.898 

39  In.  = 

348 

30.907 

30.916 

30.925 

30.934 

30.943 

30.952 

30.961 

30.969 

30.978 

30.987 

Ilundredths  of  a  Line. 

0. 

1. 

2. 

3. 

4.     5.     6.     7.     8. 

9. 

.0000 

.0009 

.0018 

.0027 

.0036    .0044    .0053    .0062    .0071 

.0080 

38 


VI.    COMPARISON    OF    THE    OLD    FRENCH    AND    METRICAL    BAROMETERS. 
1  Paris  Line  =  2.255829  Millimetres. 


French  or 
ParisLines. 

Tens. 

Units. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

10  Inch. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

120 

270.70 

272.96 

275.21 

277.47 

279.72 

281.98 

284.23 

286.49 

288.75 

291.00 

130 

293.26 

295.51 

297.77 

300.03 

302.28 

304.54 

306.79 

309.05 

311.30 

313.56 

140 

315.82 

318.07 

320.33 

322.58 

324.84 

327.10 

329.35 

331.61 

333.86 

336.12 

150 

338.37 

340.63 

342.89 

345.14 

347.40 

349.65 

351.91 

354.17 

356.42 

358.68 

160 

360.93 

363.19 

365.44 

367.70 

369.96 

372.21 

374.47 

376.72 

378.98 

381.24 

170 

383.49 

385.75 

388.00 

390.26 

392.51 

394.77 

397.03 

399.28 

401.54 

403.79 

180 

406.05 

408.30 

410.56 

412.82 

415.07 

417.33 

419.58 

421.84 

424.10 

426.35 

190 

428.61 

430.86 

433.12 

435.37 

437.63 

439.89 

442.14 

444.40 

446.65 

448.91 

200 

451.17 

453.42 

455.68 

457.93 

460.19 

462.44 

464.70 

466.96 

469.21 

471.47 

210 

473.72 

475.98 

478.24 

480.49 

482.75 

485.00 

487.26 

489.51 

491.77 

494.03 

Paris 
Lines. 

Tenths  of  a  Line. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

18  Inch. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim, 

Millim. 

Millim. 

Millim. 

Millim. 

216 

487.26 

487.48 

487.71 

487.94 

488.16 

488.39 

488.61 

488.84 

489.06 

489.29 

217 

489.51 

489.74 

489.97 

490.19 

490.42 

490.64 

490.87 

491.09 

491.32 

491.55 

218 

491.77 

492.00 

492.22 

492.45 

492.67 

492.90 

493.12 

493.35 

493.58 

493.80 

219 

494.03 

494.25 

494.48 

494.70 

494.93 

495.15 

495.38 

495.61 

495.83 

496.06 

220 

496.28 

496.51 

496.73 

496.96 

497.18 

497.41 

497.64 

497.86 

498.09 

498.31 

221 

498.54 

498.76 

498.99 

499.21 

499.44 

499.67 

499.89 

500.12 

500.34 

500.57 

222 

500.79 

501.02 

501.25 

501.47 

501.70 

501.92 

502.15 

502.37 

502.60 

502.82 

223 

503.05 

503.28 

503.50 

503.73 

503.95 

504.18 

504.40 

504.63 

504.85 

505.08 

224 

50o.31 

505.53 

505.76 

505.98 

506.21 

506.43 

506.66 

506.88 

507.11 

507.34 

225 

507.56 

507.79 

508.01 

508.24 

508.46 

508.69 

508.91 

509.14 

509.37 

509.59 

226 

509.82 

510.04 

510.27 

510.49 

510.72 

510.95 

511.17 

511.40 

511.62 

511.85 

227 

512.07 

512.30 

512.52 

512.75 

512.98 

513.20 

513.43 

513.65 

513.88 

514.10- 

19  Inch. 

228 

514.33 

514.55 

514.78 

515.01 

515.23 

515.46 

515.68 

515.91 

516.13 

516.36 

229 

516.58 

516.81 

517.04 

517.26 

517.49 

517.71 

517.94 

518.16 

518.39 

518.61 

230 

518.84 

519.07 

519.29 

519.52 

519.74 

519.97 

520.19 

520.42 

520.65 

520.87 

231 

521.10 

521.32 

521.55 

521.77 

522.00 

522.22 

522.45 

522.68 

522.90 

523.13 

232 

523.35 

523.58 

523.80 

524.03 

524.25 

524.48 

524.71 

524.93 

525.16 

525.38 

233 

525.61 

525.83 

526.06 

526.28 

526.51 

526.74 

526.96 

527.19 

527.41 

527.64 

234 

527.86 

528.09 

528.32 

528.54 

528.77 

528.99 

529.22 

529.44 

529.67 

529.89 

235 

530.12 

530.35 

530.57 

530.80 

531.02 

531.25 

531.47 

531.70 

531.92 

532.15 

236 

532.38 

532.60 

532.83 

533.05 

533.28 

533.50 

533.73 

533.95 

534.18 

534.41 

237 

534.63 

534.86 

535.08 

535.31 

535.53 

535.76 

535.98 

536.21 

536.44 

536.66 

238 

536.89 

537.11 

537.34 

537.56 

537.79 

538.02 

538.24 

538.47 

538.69 

538.92 

239 

539.14 

539.37 

539.59 

539.82 

540.05 

540.27 

540.50 

540.72 

540.95 

541.17 

Tenths  of  a  Line. 

0.     1. 

2. 

3. 

4.     5.     6.     7.     8.     9. 

o.oo  ;  0.23 

0.45 

0.68 

0.90     1.13    1.35     1.58    1.80    2.03 

39 


COMPARISON    OF    THE    OLD    FRENCH    AND    METRICAL    BAROMETERS. 
1  Paris  Line  =  2.255829  Millimetres. 


Paris  or 
French 
Lines. 

Tenths  of  a  Line. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

30  Inches. 
240 

Millim. 
541.40 

Millim. 
541.62 

Millim. 
541.85 

Millim. 
542.08 

Millim. 
542.30 

Millim. 
542.53 

Millim. 
542.75 

Millim. 
542.98 

Millim. 
543.20 

Millim. 
543.43 

241 

543.65 

543.88 

544.11 

544.33 

544.56 

544.78 

545.01 

545.23 

545.46 

545.69 

242 

545.91 

546.14 

546.36 

546.59 

546.81 

547.04 

547-26 

547.49 

547.72 

547.94 

243 

548.17 

548.39 

548.62 

548.84 

549.07 

549.29 

549.52 

549.75 

549.97 

550.20 

244 

550.42 

550.65 

550.87 

551.10 

551.32 

551.55 

551.78 

552.00 

552.23 

552.45 

245 

552.68 

552.90 

553.13 

553.35 

553.58 

553.81 

554.03 

554.26 

554.48 

554.71 

246 

554.93 

555.16 

555.39 

555.61 

555.84 

556.06 

556.29 

556.51 

556.74 

556.96 

247 

557.19 

557.42 

557.64 

557.87 

558.09 

558.32 

558.54 

558.77 

558.99 

559.22 

248 

559.45 

559.67 

559.90 

560.12 

560.35 

560.57 

560.80 

561.02 

561.25 

561.48 

249 

561.70 

561.93 

562.15 

562.38 

562.60 

562.83 

563.05 

563.28 

563.51 

563.73 

250 

563.96 

564.18 

564.41 

564.63 

564.86 

565.09 

565.31 

565.54 

565.76 

565.99 

251 

566.21 

566.44 

566.66 

566.89 

567.12 

567.34 

567.57 

567.79 

568.02 

568.24 

a  1  Inches. 

252 

568.47 

568.69 

568.92 

569.15 

569.37 

569.60 

569.82 

570.05 

570.27 

570.50 

253 

570.72 

570.95 

571.18 

571.40 

571.63 

571.85 

572.08 

572.30 

572.53 

572.75 

254 

572.98 

573.21 

573.43 

573.66 

573.88 

574.11 

574.33 

574.56 

574.79 

575.01 

255 

575.24 

575.46 

575.69 

575.91 

576.14 

576.36 

576.59 

576.82 

577.04 

577.27 

256 

577.49 

577.72 

577.94 

578.17 

578.39 

578.62 

578.85 

579.07 

579.30 

579.52 

257 

579.75 

579.97 

580.20 

580.42 

580.65 

580.88 

581.10 

581.33 

581.55 

581.78 

258 

582.00 

582.23 

582.46 

582.68 

582.91 

583.13 

583.36 

583.58 

583.81 

584.03 

259 

584.26 

584.49 

584.71 

584.94 

585.16 

585.39 

585.61 

585.84 

586.06 

586.29 

260 

586.52 

586.74 

586.97 

587.19 

587.42 

587.64 

587.87 

588.09 

588.32 

588.55 

261 

588.77 

589.00 

589.22 

589.45 

589.67 

589.90 

590.12 

590.35 

590.58 

590.80 

262 

591.03 

591.25 

591.48 

591.70 

591.93 

592.16 

592.38 

592.61 

592.83 

593.06 

263 

593.28 

593.51 

593.73 

593.96 

594.19 

594.41 

594.64 

594.86 

595.09 

595.31 

33  Inches. 

264 

595.54 

595.76 

595.99 

596.22 

596.44 

596.67 

596.89 

597.12 

597.34 

597.57 

265 

597.79 

598.02 

598.25 

598.47 

598.70 

598.92 

599.15 

599.37 

599.60 

599.82 

266 

600.05 

600.28 

600.50 

600.73 

600.95 

601.18 

601.40 

601.63 

601.86 

602.08 

267 

602.31 

602.53 

602.76 

602.98 

603.21 

603.43 

603.66 

603.89 

604.11 

604.34 

268 

604.56 

604.79 

605.01 

605.24 

605.46 

605.69 

605.92 

606.14 

606.37 

606.59 

269 

606.82 

607.04 

607.27 

607.49 

607.72 

607.95 

608.17 

608.40 

608.62 

608.85 

270 

609.07 

609.30 

609.52 

609.75 

609.98 

610.20 

610.43 

610.65 

610.88 

611.10 

271 

611.33 

611.56 

611.78 

612.01 

612.23 

612.46 

612.68 

612.91 

613.13 

613.36 

272 

613.59 

613.81 

614.04 

614.26 

614.49 

614.71 

614.94 

615.16 

615.39 

615.62 

273 

615.84 

616.07 

616.29 

616.52 

616.74 

616.97 

617.19 

617.42 

617.65 

617.87 

274 

618.10 

618.32 

618.55 

618.77 

619.00 

619.23 

619.45 

619.68 

619.90 

620.13 

275 

620.35 

620.58 

620.80 

621.03 

621.26 

621.48 

621.71 

621.93 

622.16 

622.38 

Hundredths  of  a  Line. 

0. 

1. 

2.     3.     4.     5.     6.     7. 

8. 

9. 

0.000 

0.023 

0.045    0.068    0.090   0.113    0.135    0.158 

0.180 

0.203 

c 


40 


COMPARISON    OF    THE    OLD    FRENCH    AND    METRICAL   BAROMETERS. 
1  Paris  Line  =  2.255829  Millimetres. 


Tenths  of  a  Line. 

Paris  or 

French 
Lines. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

23  Inches. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

276 

622.61 

622.83 

623.06 

623.29 

623.51 

623.74 

623.96 

624.19 

624.41 

624.64 

277 

624.86 

625.09 

625.32 

625.54 

625.77 

625.99 

626.22 

626.44 

626.67 

626.89 

278 

627.12 

627.35 

627.57 

627.80 

628.02 

628.25 

628.47 

628.70 

628.93 

629.15 

279 

629.38 

629.60 

629.83 

630.05 

630.28 

630.50 

630.73 

630.96 

631.18 

631.41 

280 

631.63 

631.86 

632.08 

632.31 

632.53 

632.76 

632.99 

633.21 

633.44 

633.66 

281 

633.89 

634.11 

634.34 

634.56 

634.79 

635.02 

635.24 

635.47 

635.69 

635.92 

282 

636.14 

636.37 

636.59 

636.82 

637.05 

637.27 

637.50 

637.72 

637.95 

638.17 

283 

638.40 

638.63 

638.85 

639.08 

639.30* 

639.53 

639.75 

639.98 

640.20 

640.43 

284 

640.66 

640.88 

641.11 

641.33 

641.56 

641.78 

642.01 

642.23 

643.46 

642.69 

285 

642.91 

643.14 

643.36 

643.59 

643.81 

644.04 

644.26 

644.49 

644.72 

644.94 

286 

645.17 

645.39 

645.62 

645.84 

646.07 

646.30 

646.52 

646.75 

646.97 

647.20 

287 

647.42 

647.65 

647.87 

648.10 

648.33 

648.55 

648.78 

649.00 

649.23 

649.45 

34  Inches. 

288 

649.68 

649.90 

650.13 

650.36 

650.58 

650.81 

651.03 

651.26 

651.48 

651.71 

289 

651.93 

652.16 

652.39 

652.61 

652.84 

653.06 

653.29 

653.51 

653.74 

653.96 

290 

654.19 

654.42 

654.64 

654.87 

655.09 

655.32 

655.54 

655.77 

656.00 

656.22 

291 

656.45 

656.67 

656.90 

657.12 

657.35 

657.57 

657.80 

658.03 

658.25 

658.48 

292 

658.70 

658.93 

659.15 

659.38 

659.60 

659.83 

660.06 

660.28 

660.51 

660.73 

293 

660.96 

661.18 

661.41 

661.63 

661.86 

662.09 

662.31 

662.54 

662.76 

662.99 

294 

663.21 

663.44 

663.66 

663.89 

664.12 

664.34 

664.57 

664.79 

665.02 

665.24 

295 

665.47 

665.70 

665.92 

666.15 

666.37 

666.60 

666.82 

667.05 

667.27 

667.50 

296 

667.73 

667.95 

668.18 

668.40 

668.63 

668.85 

669.08 

669.30 

669.53 

669.76 

297 

669.98 

670.21 

670.43 

670.66 

670.88 

671.11 

671.33 

671.56 

671.79 

672.01 

298 

672.24 

672.46 

672.69 

672.91 

673.14 

673.36 

673.59 

673.82 

674.04 

674.27 

299 

674.49 

674.72 

674.94 

675.17 

675.40 

675.62 

675.85 

676.07 

676.30 

676.52 

3  5  Inches. 

300 

676.75 

676.97 

677.20 

677.43 

677.65 

677.88 

678.10 

678.33 

678.55 

678.78 

301 

679.00 

679.23 

679.46 

679.68 

679.91 

680.13 

680.36 

680.58 

680.81 

681.03 

302 

681.26 

681.49 

681.71 

681.94 

682.16 

682.39 

682.61 

682.84 

683.07 

683.29 

303 

683.52 

683.74 

683.97 

684.19 

684.42 

684.64 

684.87 

685.10 

685.32 

685.55 

304 

685.77 

686.00 

686.22 

686.45 

686.67 

686.90 

687.13 

687.35 

687.58 

687.80 

305 

688.03 

688.25 

688.48 

688.70 

688.93 

689.16 

689.38 

689.61 

689.83 

690.06 

306 

690.28 

690.51 

690.73 

690.96 

691.19 

691.41 

691.64 

691.86 

692.09 

692.31 

307 

692.54 

692.77 

692.99 

693.22 

693.44 

693.67 

693.89 

694.12 

694.34 

694.57 

308 

694.80 

695.02 

695.25 

695.47 

695.70 

695.92 

696.15 

696.37 

696.60 

696.83 

309 

697.05 

697.28 

697.50 

697.73 

697.95 

698.18 

698.40 

698.63 

698.86 

699.08 

310 

699.31 

699.53 

699.76 

699.98 

700.21 

700.43 

700.66 

700.89 

701.11 

701.34 

311 

701.56 

701.79 

702.01 

702.24 

702.47 

702.69 

702.92 

703.14 

703.37 

703.59 

Hundredths  of  a  Line. 

0. 

1. 

2.     3.     4.     5.     6.     7. 

8. 

0. 

0.000 

0.023 

0.045    0.068    0.090   0.113    0.135    0.158 

0.180 

0.203 

41 


4  COMPARISON    OF   THE    OLD    FRENCH    AND    METRICAL    BAROMETERS. 

1  Paris  Line  =  2.255829  Millimetres. 


Tenths  of  a  Line. 

Paris  or 

French 
Lines. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

3  6  Inches. 

Millim. 

Millim. 

Millim. 

MiUim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

312 

703.82 

704.04 

704.27 

704.50 

704.72 

704.95 

705.17 

705.40 

705.62 

705.85 

313 

706.07 

706.30 

706.53 

706.75 

706.98 

707.20 

707.43 

707.65 

707.88 

708.10 

314 

708.33 

708.56 

708.78 

709.01 

709.23 

709.46 

709.68 

709.91 

710.13 

710.36 

315 

710.59 

710.81 

711.04 

711.26 

711.49 

711.71 

711.94 

712.17 

712.39 

712.62 

316 

712.84 

713.07 

713.29 

713.52 

713.74 

713.97 

714.20 

714.42 

714.65 

714.87 

317 

715.10 

715.32 

715.55 

715.77 

716.00 

716.23 

716.45 

716.68 

716.90 

717.13 

318 

717.35 

717.58 

717.80 

718.03 

718.26 

718.48 

718.71 

718.93 

719.16 

719.38 

319 

719.61 

719.84 

720.06 

720.29 

720.51 

720.74 

720.96 

721.19 

721.41 

721.64 

320 

721.87 

722.09 

722.32 

722.54 

722.77 

722.99 

723.22 

723.44 

723.67 

723.90 

321 

724.12 

724.35 

724.57 

724.80 

725.02 

725.25 

725.47 

725.70 

725.93 

7-26.15 

322 

726.38 

726.60 

726.83 

727.05 

727.28 

727.50 

727.73 

727.96 

728.18 

728.41 

323 

728.63 

728.86 

729.08 

729.31 

729.54 

729.76 

729.99 

730.21 

730.44 

730.66 

37  Inches. 

324 

730.89 

731.11 

731.34 

731.57 

731.79 

732.02 

732.24 

732.47 

732.69 

732.92 

325 

733.14 

733.37 

733.60 

733.82 

734.05 

734.27 

734.50 

734.72 

734.95 

735.17 

326 

735.40 

735.63 

735.85 

736.08 

736.30 

736.53 

736.75 

736.98 

737.20 

737.43 

327 

737.66 

737.88 

738.11 

738.33 

738.56 

738.78 

739.01 

739.24 

739.46 

739.69 

328 

739.91 

740.14 

740.36 

740.59 

740.81 

741.04 

741.27 

741.49 

741.72 

741.94 

329 

742.17 

742.39 

742.62 

742.84 

743.07 

743.30 

743.52 

743.75 

743.97 

744.20 

330 

744.42 

744.65 

744.87 

745.10 

745.33 

745.55 

745.78 

746.00 

746.23 

746.45 

331 

746.68 

746.90 

747.13 

747.36 

747.58 

747.81 

748.03 

748.26 

748.48 

748.71 

332 

748.94 

749.16 

749.39 

749.61 

749.84 

750.06 

750.29 

750.51 

750.74 

750.97 

333 

751.19 

751.42 

751.64 

751.87 

752.09 

752.32 

752.54 

752.77 

753.00 

753.22 

334 

753.45 

753.67 

753.90 

754.12 

754.35 

754.57 

754.80 

755.03 

755.25 

755.48 

335 

755.70 

755.93 

756.15 

756.38 

756.61 

756.83 

757.06 

757.28 

757.51 

757.73 

JJJ8  Inches. 

336 

757.96 

758.18 

758.41 

758.64 

758.86 

759.09 

759.31 

759.54 

759.76 

759.99 

337 

760.21 

760.44 

760.67 

760.89 

761.12 

761.34 

761.57 

761.79 

762.02 

762.24 

338 

762.47 

762.70 

762.92 

763.15 

763.37 

763.60 

763.82 

764.05 

764.27 

764.50 

339 

764.73 

764.95 

765.18 

765.40 

765.63 

765.85 

766.08 

766.31 

766.53 

766.76 

340 

766.98 

767.21 

767.43 

767.66 

767.88 

768.11 

768.34 

768.56 

768.79 

769.01 

341 

769.24 

769.46 

769.69 

769.91 

770.14 

770.37 

770.59 

770.82 

771.04 

771.27 

342 

771.49 

771.72 

771.94 

772.17 

772.40 

772.62 

772.85 

773.07 

773.30 

773.52 

t  343 

773.75 

773.97 

774.20 

774.43 

774.65 

774.88 

775.10 

775.33 

775.55 

775.78 

344 

776.01 

776.23 

776.46 

776.68 

776.91 

777.13 

777.36 

777.58 

777.81 

778.04 

345 

778.26 

778.49 

778.71 

778.94 

779.16 

779.39 

779.61 

779.84 

780.07 

780.29 

346 

780.52 

780.74 

780.97 

781.19 

781.42 

781.64 

781.87 

782.10 

782.32 

782.55 

347 

782.77 

783.00 

783.22 

783.45 

783.67 

783.90 

784.13 

784.35 

784.58 

784.80 

2  9  Inches. 

348 

785.03 

785.25 

785.48 

785.71 

785.93 

786.16 

786.38 

786.61 

786.83 

787.06 

Hundredths  of  a  Line. 

0. 

1. 

2.     3.     4.     5.     6.     7. 

8. 

9. 

0.000 

0.023 

0.045    0.068    0.090   0.113    0.135    0.158 

0.180 

0.203 

VII.  -VIII. 
COMPARISON 


OP 


THE    RUSSIAN    BAROMETER 


THE    METRICAL  AND  THE    OLD    FRENCH    BAROMETERS, 


OB 


TABLES 

FOR  CONVERTING  RUSSIAN  HALF-LINES  INTO  MILLIMETRES, 
AND   INTO  FRENCH  OR  PARIS   LINES; 

GIVING    THE    VALUES    CORRESPONDING    TO    EVERY   HALF-LINE    FROM   440    TO    540, 

OR    FROM    22    TO    27   INCHES  ;   AND    TO    EVERY   TENTH,   FROM   540   TO    610 

HALF-LINES,   OR  FROM  27  TO  30.5  ENGLISH   INCHES. 


C  43 


KUSSIAN     BAROMETER. 


A  REGULAR  system  of  Meteorological  Observations  has  been  established  by  order 
of  the  Russian  government  throughout  the  extensive  regions  placed  under  its  sway, 
and  a  vast  amount  of  observations  made  in  Europe,  in  Asia,  and  in  North  America 
have  already  been  published.  The  scale  of  the  barometer  employed  in  this  system 
is  divided  in  units,  each  of  which  is  equal  to  one  half  of  a  Russian,  or  English 
decimal  line,  that  is,  1  =  0.05  of  an  inch,  600  half-lines  of  the  Russian  Barometer 
being  =  30  inches  of  the  English  Barometer. 

The  conversion  of  this  scale,  which  is  the  English  scale,  slightly  modified  in  its 
form,  is  easy.  It  suffices  to  divide  the  Russian  heights  by  two,  and  to  put  back,  by 
one  figure,  the  decimal  point,  in  order  to  have  them  converted  into  English  inches 
and  decimals.  This  transformation  is  so  'easy  to  effect,  that  a  peculiar  table  for  it 
would  seem  superfluous. 

The  normal  temperature  of  the  standard  being  the  same  as  that  of  the  English, 
that  is,  13°J  Reaumur,  or  62°  .Fahrenheit,  the  reduction  of  the  Russian  Barometer 
to  the  freezing  point  can  be  made  by  means  of  the  table  for  reducing  the  English 
Barometers.  But  the  attached  thermometer  being  that  of  Reaumur,  its  indications 
must  be  first  converted  into  degrees  of  Fahrenheit. 

Tables  VII.  and  VIII.,  which  follow,  have  been  computed  in  order  to  render  more 
easy  the  comparison  and  the  use  of  the  Barometrical  Observations  recorded  in  the 
large  collection,  published  annually  by  order  of  the  Emperor  of  Russia,  under  the 
name  of  Annuaire  Meteor  ologique  et  Magnetique  du  Corps  des  Ingenieurs  des 
Mines. 


45 


VII.     COMPARISON    OF    THE    RUSSIAN    AND    METRICAL    BAROMETERS. 


1  Russian  Half-Line  =  1.269977  Millimetres. 


Units  or  Russian  Half-Lines. 

Russian 

Half-Lines. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

33  Inch. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

440 

558.79 

560.06 

561.33 

562.60 

563.87 

565.14 

566.41 

567.68 

568.95 

570.22 

450 

571.49 

572.76 

574.03 

575.30 

576.57 

577.84 

579.11 

580.38 

581.65 

582.92 

460 

584.19 

585.46 

586.73 

588.00 

589.27 

590.54 

591.81 

593.08 

594.35 

595.62 

470 

596.89 

598.16 

599.43 

600.70 

601.97 

603.24 

604.51 

605.78 

607.05 

608.32 

480 

609.59 

610.86 

612.13 

613.40 

614.67 

615.94 

617.21 

618.48 

619.75 

621.02 

34.5  In. 

490 

622.29 

623.56 

624.83 

626.10 

627.37 

628.64 

629.91 

631.18 

632.45 

633.72 

500 

634.99 

636.26 

637.53 

638.80 

640.07 

641.34 

642.61 

643.88 

645.15 

646.42 

510 

647.69 

648.96 

650.23 

651.50 

652.77 

654.04 

655.31 

656.58 

657.85 

.659.12 

520 

660.39 

661.66 

662.93 

664.20 

665.47 

666.74 

668.01 

669.28 

670.55 

671.82 

530 

673.09 

674.36 

675.63 

676.90 

678.17 

679.44 

680.71 

681.98 

683.25 

684.52 

Tenths. 

Russian 

Half-Lines. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

y. 

§. 

9. 

37  Inch. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

540 

685.79 

685.91 

686.04 

686.17 

686.30 

686.42 

686.55 

686.68 

686.80 

686.93 

541 

687.06 

687.18 

687.31 

687.44 

687.57 

687.69 

687.82 

687.95 

688.07 

688.20 

542 

688.33 

688.45 

688.58 

688.71 

688.84 

688.96 

689.09 

689.22 

689.34 

689.47 

543 

689.60 

689.72 

689.85 

689.98 

690.11 

690.23 

690.36 

690.49 

690.61 

690.74 

544 

690.87 

690.99 

691.12 

691.25 

691.38 

691.50 

691.63 

691.76 

691.88 

692.01 

545 

692.14 

692.26 

692.39 

692.52 

692.65 

692.77 

692.90 

693.03 

693.15 

693.28 

546 

693.41 

693.53 

693.66 

693.79 

693.91 

694.04 

694.17 

694.30 

694.42 

694.55 

547 

694.68 

694.80 

694.93 

695.06 

695.19 

695.31 

695.44 

695.57 

695.69 

695.82 

548 

695.95 

696.07 

696.20 

696.33 

696.46 

696.58 

696.71 

696.84 

696.96 

697.09 

549 

697.22 

697.34 

697.47 

697.60 

697.73 

697.85 

697.98 

698.11 

698.23 

698.36 

ar.s  in. 

550 

698.49 

698.61 

698.74 

698.87 

699.00 

699.12 

699.25 

699.38 

699.50 

699.63 

551 

699.76 

699.88 

700.01 

700.14 

700.27 

700.39 

700.52 

700.65 

700.77 

700.90 

552 

701.03 

701.15 

701.28 

701.41 

701.54 

701.6*6 

701.79 

701.92 

702.04 

702.17 

553 

702.30 

702.42 

702.55 

702.68 

702.81 

702.93 

703.06 

703.19 

703.31 

703.44 

554 

703.57 

703.69 

703.82 

703.95 

704.08 

704.20 

704.33 

704.46 

704.58 

704.71 

555 

704.84 

704.96 

705.09 

705.22 

705.35 

705.47 

705.60 

705.73 

705.85 

705.98 

556 

706.11 

706.23 

706.36 

706.49 

706.62 

706.74 

706.87 

707.00 

707.12 

707.25 

557 

707.38 

707.50 

707.63 

707.76 

707.89 

708.01 

708.14 

708.27 

708.39 

708.52 

558 

708.65 

708.77 

708.90 

709.03 

709.16 

709.28 

709.41 

709.54 

709.66 

709.79 

559 

709.92 

710.14 

710.27 

710.40 

710.53 

710.65 

710.78 

710.81 

710.93 

711.06 

38  Inch. 

560 

711.19 

711.31 

711.44 

711.57 

711.70 

711.82 

711.95 

712.08 

712.20 

712.33 

561 

712.46 

712.58 

712.71 

712.84 

712.97 

713.09 

713.22 

713.35 

713.47 

713.60 

562 

713.73 

713.85 

713.98 

714.11 

714.24 

714.36 

714.49 

714.62 

714.74 

714.87 

563 

715.00 

715.12 

715.25 

715.38 

715.51 

715.63 

715.76 

715.89 

716.01 

716.14 

564 

716.27 

716.39 

716.52 

716.65 

716.78 

716.90 

717.03 

717.16 

717.28 

717.41 

565 

717.54 

717.66 

717.79 

717.92 

718.04 

718.17 

718.30 

718.43 

718.55 

718.68 

566 

718.81 

718.93 

719.06 

719.19 

719.31 

719.44 

T19.57 

719.70 

719.82 

719.95 

567 

720.08 

720.20 

720.33 

720.46 

720.58 

720.71 

720.84 

720.97 

721.09 

721.22 

568 

721.35 

721.47 

721.60 

721.73 

721.85 

721.98 

722.11 

722.24 

722.36 

722.49 

569 

722.62 

722.74 

722.87 

723.00 

723.12 

723.25 

723.38 

723.51 

723.63 

723.76 

46 


COMPARISON    OF    THE    RUSSIAN    AND    METRICAL    BAROMETERS. 
1  Russian  Half-Line  =  1.269977  Millimetre. 


Tenths. 

Russian 

Half-Lines. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

V. 

8. 

9. 

28.5  Inch. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

570 

723.89 

724.01 

724.14 

724.27 

724.39 

724.52 

724.65 

724.78 

724.90 

725.03 

571 

725.16 

725.28 

725.41 

725.54 

725.66 

725.79 

725.92 

726.05 

726.17 

726.30 

5.72 

726.43 

726,55 

726.68 

726.81 

726.93 

727.06 

727.19 

727.32 

727.44 

727.57 

573 

727.70 

727.82 

7.27.95 

728.08 

728.20 

728.33 

728.46 

728.59 

728.71 

728.84 

574 

728.97 

729.08 

729.21 

729.34 

729.46 

729.59 

729.73 

729.85 

729.97 

730.11 

575 

730.24 

730.36 

730.49 

730.62 

730.74 

730.87 

731.00 

731.13 

731.25 

731.38 

576 

731.51 

731.63 

731.76 

731.89 

732.01 

732.14 

732.27 

732.40 

732.52 

732.65 

577 

732.78 

732.90 

733.03 

733.16 

733.28 

733.41 

733.54 

733.67 

733.79 

733.92 

578 

734.05 

734.17 

734.30 

734.43 

734.55 

734.68 

734.81 

734.94 

735.06 

735.19 

579 

735.32 

735.44 

735.57 

735.70 

735.82 

735.95 

736.08 

736.21 

736.33 

736.46 

39  Inch. 

580 

736.59 

736.71 

736.84 

736.97 

737.09 

737.22 

737V35 

737.48 

737.60 

737.73 

581 

737.86 

737.98 

738.11 

738.24 

738.36 

738.49 

738.62 

738.75 

738.87 

739.00 

582 

739.13 

739.25 

739.38 

739.51 

739.63 

739.76 

739.89 

740.02 

740.14 

740.27 

583 

740.40 

740.52 

740.65 

740.78 

740.90 

741.03 

741.16 

741.29 

741.41 

741.54 

584 

741.67 

741.79 

741.92 

742.05 

742.17 

742.30 

742.43 

742.56 

742.68 

742.81 

585 

742.94 

743.06 

743.19 

743.32 

743.44 

743.57 

748.70 

743.83 

743.95 

744.08 

586 

744.21 

744.33 

744.46 

744.59 

744.71 

744.84 

744.97 

745.10 

745.22 

745.35 

587 

745.48 

745.60 

745.73 

745.86 

745.98 

746.11 

746.24 

746.37 

746149 

746.62 

588 

746.75 

746.87 

747.00 

747.13 

747.25 

747.38 

747.51 

747.64 

747.76 

747.89 

589 

748.02 

748.14 

748.27 

748.40 

748.52 

748.65 

748.78 

748.91 

749.03 

749.16 

29.5  In. 

590 

749.29 

749.41 

749.54 

749.67 

749.79 

749.92 

750.05 

750.18 

750.30 

750.43 

591 

750.56 

750.68 

750.81 

750.94 

751.06 

751.19 

751.32 

751.45 

751.57 

751.70 

592 

751.83 

751.95 

752.08 

752.21 

752.33 

752.46 

752.59 

752.72 

752.84 

752.97 

593 

753.10 

753.22 

753.35 

753.48 

753.60 

753.73 

753.86 

753.99 

754.11 

754.24 

594 

754.37 

754.49 

754.62 

754.75 

754.87 

755.00 

755.13 

755.26 

755.38 

755.51 

595 

755.64 

755.76 

755.89 

756.02 

756.14 

756.27 

756.40 

756.53 

756.65 

756.78 

596 

756.91 

757.03 

757.16 

757.29 

757.41 

757.54 

757.67 

757.80 

757.92 

758.05 

597 

758.18 

758.30 

758.43 

758.56 

758.68 

758.81 

758.94 

759.07 

759.19 

759.32 

598 

759.45 

759.57 

759.70 

759.84 

759.96 

760.09 

760.21 

760.34 

760.46 

760.59 

599 

760.72 

760.84 

760.97 

761.10 

761.22 

761.35 

761.48 

761.61 

761.73 

761.86 

30  Inch. 

600 

761.99 

762.11 

762.24 

762.37 

762.49 

762.62 

762.75 

762.88 

763.00 

763.13 

601 

763.26 

763.38 

763.51 

763.64 

763.76 

763.89 

764.02 

764.15 

764.27 

764.40 

602 

764.53 

764.65 

764.78 

764.91 

765.03 

765.16 

765.29 

765.42 

765.54 

765.67 

603 

765.80 

765.92 

766.05 

766.18 

766.30 

766.43 

766.56 

766.69 

766.81 

766.95 

604 

767.07 

767.19 

767.32 

767.45 

767.57 

767.70 

767.83 

767.96 

768.08 

768.21 

605 

768.34 

768.46 

768.59 

768.72 

768.84 

768.97 

769.10 

769.23 

769.35 

769.48 

606 

769.61 

769.73 

769.85 

769.99 

770.11 

770.24 

770.37 

770.50 

770.62 

770.75 

607 

770.88 

771.00 

771.13 

771.26 

771.38 

771.51 

771.64 

771.77 

771.89 

772.02 

608 

772.15 

772.27 

772.40 

772.53 

772.65 

772.78 

772.91 

773.03 

773.16 

773.29 

609 

773.42 

773.54 

773.67 

773.80 

773.92 

774.05 

774.18 

774.30 

774.43 

774.56 

Hundredths. 

0.000 

0.013  1  0.025 

0.038    0.051    0.063    0.076    0.089    0.102 

0,114 

47 


VIII.     COMPARISON    OF    THE    RUSSIAN    AND    OLD    FRENCH   BAROMETERS. 


1  Russian  Half-Line  =  0.562976  Paris  Line. 


Units  or  Russian  Half-Lines. 

Russian 

Half-Lines. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

r. 

8. 

9. 

33  Inch. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par  line. 

Par.  line. 

Par.  line 

Par.  line. 

Par.  line. 

440 

247.71 

248.27 

248.84 

249.40 

249.96 

250.52 

251.09 

251.65 

252.21 

252.78 

450 

253.34 

253.90 

254.47 

255.03 

255.59 

256.15 

256.72 

257.28 

257.84 

258.41 

460 

258.97 

259.53 

260.09 

260.66 

261.22 

261.78 

262.35 

262.91 

263.47 

264.04 

470 

264.60 

265.16 

265.72 

266.29 

266.85 

267.41 

267.98 

268.54 

269.10 

269.67 

480 

270.23 

270.79 

271.35 

271.92 

272.48 

273.04 

273.61 

274.17 

274.73 

275.30 

34.5  In. 

490 

275.86 

276.42 

276.98 

277.55 

278.11 

278.67 

279.24 

279.80 

280.36 

280.93 

500 

281.49 

282.05 

282.61 

283.18 

283.74 

284.30 

284.87 

285.43 

285.99 

286.55 

510 

287.12 

287.68 

288.24 

288.81 

289.37 

289.93 

290.50 

291.06 

291.62 

292.18 

520 

292.75 

293.31 

293.87 

294.44 

295.00 

295.56 

296.13 

296.69 

297.25 

297.81 

530 

298.38 

298.94 

299.50 

300.07 

300.63 

301.19 

301.76 

302.32 

302.88 

303.44 

Tenths. 

Russian 

Half-Lines. 

i 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

?. 

8. 

9. 

37  Inch. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

540 

304.01 

304.06 

304.12 

304.18 

304.23 

304.29 

304.34 

304.40 

304.46 

304.51 

541 

304.57 

304.63 

304.68 

304.74 

304.80 

304.85 

304.91 

304.96 

305.02 

305.08 

542 

305.13 

305.19 

305.25 

305.30 

305.36 

305.41 

305.47 

305.53 

305.58 

305.64 

543 

305.70 

305.75 

305.81 

305.86 

305.92 

305.98 

306.03 

306.09 

306.15 

306.20 

544 

306.26 

306.32 

306.37 

306.43 

306.48 

306.54 

306.60 

306.65 

306.71 

306.77 

545 

306.82 

306.88 

306.93 

306.99 

307.05 

307.10 

307.16 

307.22 

307.27 

307.33 

546 

307.38 

307.44 

307.50 

307.55 

307.61 

307.67 

307.72 

307.78 

307.84 

307.89 

547 

307.95 

308.00 

308.06 

308.12 

308.17 

308.23 

308.29 

308.34 

308.40 

308.45 

548 

308.51 

308.57 

308.62 

308.68 

308.74 

308.79 

308.85 

308.90 

308.96 

309.02 

549 

309.07 

309.13 

309.19 

309.24 

309.30 

309.36 

309.41 

309.47 

309.52 

309.58 

37.5  In. 

550 

309.64 

309.69 

309.75 

309.81 

309.86 

309.92 

309.97 

310.03 

310.09 

310.14 

551 

310.20 

310.26 

310.31 

310.37 

310.42 

310.48 

310.54 

310.59 

310.65 

310.71 

552 

310.76 

310.82 

310.88 

310.93 

310.99 

311.04 

311.10 

311.16 

311.21 

311.27 

553 

311.33 

311.38 

311.44 

311.49 

311.55 

311.61 

311.66 

311.72 

311.78 

311.83 

554 

311.89 

311.95 

312.00 

312.06 

312.11 

312.17 

312.23 

312.28 

312.34 

312.40 

555 

312.45 

312.51 

312.56 

312.62 

312.68 

312.73 

312.79 

312.85 

312.90 

312.96 

556 

313.01 

313.07 

313.13 

313.18 

313.24 

313.30 

313.35 

313.41 

313.47 

313.52 

557 

313.56 

313.63 

313.69 

313.75 

313.80 

313.86 

313.92 

313.97 

314.03 

314.08 

558 

314.14 

314.20 

314.25 

314.31 

314.37 

314.42 

314.48 

314.53 

314.59 

314.65 

559 

314.70 

314.76 

314.82 

314.87 

314.93 

314.99 

315.04 

315.10 

315.15 

315.21 

38  Inch. 

560 

315.27 

315.32 

315.38 

315.44 

315.49 

315.55 

315.60 

315.66 

315.72 

315.77 

561 

315.83 

315.89 

315.94 

316.00 

316.05 

316.11 

316.17 

316.22 

316.28 

316.34 

562 

316.39 

316.45 

316.51 

316.56 

316.62 

316.67 

316.73 

316.79 

316.84 

316.90 

563 

316.96 

317.01 

317.07 

317.12 

317.18 

317.24 

317.29 

317.35 

317.41 

317.46 

564 

317.52 

317.57 

317.63 

317.69 

317.74 

317.80 

317.86 

317.91 

317.97 

318.03 

565 

318.08 

318.14 

318.19 

318.25 

318.31 

318.36 

318.42 

318.48 

318.53 

318.59 

566 

318.64 

318.70 

318.76 

318.81 

318.87 

318.93 

318.98 

319.04 

319.09 

319.15 

567 

319.21 

319.26 

319.32 

319.38 

319.43 

319.49 

319.55 

319.60 

319.66 

319.71 

568 

319.77 

319.83 

319.88 

319.94 

320.00 

320.05 

320.11 

320.16 

320.22 

320.28 

569 

320.33 

320.39 

320.45 

320.50 

320.56 

320.61 

320.67 

320.73 

320.78 

320.84 

48 


COMPARISON    OF    THE    RUSSIAN    AND    OLD    FRENCH   BAROMETERS. 
1  Russian  Half-Line  =  0.562976  Paris  Line. 


Tenths. 

Russian 

Half-Lines. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

38.5  Inch. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line 

Par.  line. 

Par.  line. 

Par.  line. 

570 

320.90 

320.95 

321.01 

321.07 

321.12 

321.18 

321.23 

321.29 

321.35 

321.40 

571 

321.46 

321.52 

321.57 

321.63 

321.68 

321.74 

321.80 

321.85 

321.91 

321.97 

572 

322.02 

322.08 

322.13 

322.19 

322.25 

322.30 

322.36 

322.42 

322.47 

322.53 

573 

322.59 

322.64 

322.70 

322.75 

322.81 

322.87 

322.92 

322.98 

323.04 

323.09 

574 

323.15 

323.20 

323.26 

323.32 

323.37 

323.43 

323.49 

323.54 

323.60 

323.65 

575 

323.71 

323.77 

323.82 

323.88 

323.94 

323.99 

324.05 

324.11 

324.16 

324.22 

576 

324.27 

324.33 

324.39 

324.44 

324.50 

324.56 

324.61 

324.67 

324.72 

324.78 

577 

324.84 

324.89 

324.95 

325.01 

325.06 

325.12 

325.17 

325.23 

325.29 

325.34 

578 

325.40 

325.46 

325.51 

325.57 

325.63 

325.68 

325.74 

325.79 

325.85 

325.91 

579 

325.96 

326.02 

326.08 

326.13 

326.19 

326.24 

326.30 

326.36 

326.41 

326.47 

39  Inch. 

580 

326.53 

326.58 

326.64 

326.69 

326.75 

326.81 

326.86 

326.92 

326.98 

327.03 

581 

327.09 

327.15 

327.20 

327.26 

327.31 

327.37 

327.43 

327.48 

327.54 

327.60 

582 

327.65 

327.71 

327.76 

327.82 

327.88 

327.93 

327.99 

328.05 

328.10 

328.16 

583 

328.22 

328.27 

328.33 

328.38 

328.44 

328.50 

328.55 

328.61 

328.67 

328.72 

584 

328.78 

328.83 

328.89 

328.95 

329.00 

329.06 

329.12 

329.17 

329.23 

329.28 

585 

329.34 

329.40 

329.45 

329.51 

329.57 

329.62 

329.68 

329.74 

329.79 

329.85 

586 

329.90 

329.96 

330.02 

330.07 

330.13 

330.19 

330.24 

330.30 

330.35 

330.41 

587 

330.47 

330.52 

330.58 

330.64 

330.69 

330.75 

330.80 

330.86 

330.92 

330.97 

588 

331.03 

331.09 

331.14 

331.20 

331.26 

331.31 

331.37 

331.42 

331.48 

331.54 

589 

331.59 

331.65 

331.71 

331.76 

331.82 

331.87 

331.93 

331.99 

332.04 

332.10 

39.5  In. 

590 

332.16 

332.21 

332.27 

332.32 

332.38 

332.44 

332.49 

332.55 

332.61 

332.66 

591 

332.72 

332.78 

332.83 

332.89 

332.94 

333.00 

333.06 

333.11 

333.17 

333.23 

592 

333.28 

333.34 

333.39 

333.45 

333.51 

333.56 

333.62 

333.68 

333.73 

333.79 

593 

333.84 

333.90 

333.96 

334.01 

334.07 

334.13 

334.18 

334.24 

334.30 

334.35 

594 

334.41 

334.46 

334.52 

334.58 

334.63 

334.69 

334.75 

334.80 

334.86 

334.91 

595 

334.97 

335.03 

335.08 

335.14 

335.20 

335.25 

335.31 

335.36 

335.42 

335.48 

596 

335.53 

335.59 

335.65 

335.70 

335.76 

335.82 

335.87 

335.93 

335.98 

336.04 

597 

336.10 

336.15 

336.21 

336.27 

336.32 

336.38 

336.43 

336.49 

336.55 

336.60 

598 

336.66 

336.72 

336.77 

336.83 

336.88 

336.94 

337.00 

337.05 

337.11 

337.17 

599 

337.22 

337.28 

337.34 

337.39 

337.45 

337.50 

337.56 

337.62 

337.67 

337.73 

30  Inch. 

600 

337.79 

337.84 

337.90 

337.95 

338.01 

338.07 

338.12 

338.18 

338.24 

338.29 

601 

338.35 

338.40 

338.46 

338.52 

338.57 

338.63 

338.69 

338.74 

338.80 

338.86 

602 

338.91 

338.97 

339.02 

339.08 

339.14 

339.19 

339.25 

339.31 

339.36 

339.42 

603 

339.47 

339.53 

339.59 

339.64 

339.70 

339.76 

339.81 

339.87 

339.92 

339.98 

604 

340.04 

340.09 

340.15 

340.21 

340.26 

340.32 

340.38 

340.43 

340.49 

340.54 

605 

340.60 

340.66 

340.71 

340.77 

340.83 

340.88 

340.94 

340.99 

341.05 

341.11 

606 

341.16 

341.22 

341.28 

341.33 

341.39 

341.44 

341.50 

341.56 

341.61 

341.67 

607 

341.73 

341.78 

341.84 

341.90 

341.95 

342.01 

342.06 

342.12 

342.18 

342.23 

608 

342.29 

342.35 

342.40 

342.46 

342.51 

342.57 

342.63 

342.68 

342.74 

342.80 

609 

342.85 

342.91 

342.96 

343.02 

343.08 

343.13 

343.19 

343.25 

343*.30 

343.36 

Hundredths. 

0.000 

0.006 

0.011 

0.017   0.022    0.028    0.034   0.039    0.045 

0.051 

49 


IX. -XVI. 

COMPARISON 

OF 

I 

BAROMETRICAL   DIFFERENCES 

EXPRESSED  IN  MEASURES  OF   DIFFERENT  SCALES, 

OB 

TABLES 


FOR    CONVERTING    ENGLISF;  INCHES,   MILLIMETRES,   PARIS    LINES,   AND    RUSSIAN 
HALF-LINES    INTO    EACH    OTHER. 


51 


IX.      CONVERSION    OF    ENGLISH    INCHES    INTO    MILLIMETRES. 


1  English  Inch  =  25.39954  Millimetres. 


Hundredths  of  an  Inch. 

English 

Inches  and 

Tenths. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0.0 

0.000 

0.254 

0.508 

0.762 

1.016 

1.270 

1.524 

1.778 

2.032 

2.286 

0.1 

2.540 

2.794 

3.048 

3.302 

3.556 

3.810 

4.064 

4.318 

4.572 

4.826 

0.2 

5.080 

5.334 

5.588 

5.842 

6.096 

6.350 

6.604 

6.858 

7.112 

7.366 

0.3 

7.620 

7.874 

8.128 

8.382 

8.636 

8.890 

9.144 

9.398 

9.652 

9.906 

0.4 

10.160 

10.414 

10.668 

10.922 

11.176 

11.430 

11.684 

11.938 

12.192 

12.446 

0.5 

12.700 

12.954 

13.208 

13.462 

13.716 

13.970 

14.224 

14.478 

14.732 

14.986 

0.6 

• 

15.240 

15.494 

15.748 

16.002 

16.256 

16.510 

16.764 

17.018 

17.272 

17.526 

0.7 

17.780 

18.034 

18.288 

18.542 

18.796 

19.050 

19.304 

19.558 

19.812 

20.066 

0.8 

20.320 

20.574 

20.828 

21.082 

21.336 

21.590 

21.844 

22.098 

22.352 

22.606 

0.9 

22.860 

23.114 

23.368 

23.622 

23.876 

24.130 

24.384 

24.638 

24.892 

25.146 

.0 

25.400 

25.654 

25.908 

26.162 

26.416 

26.670 

26.924 

27.178 

27.432 

27.685 

.1 

27.939 

28.193 

28.447 

28.701 

28.955 

29.209 

29.463 

29.717 

29.971 

,30.225 

.2 

30.479 

30.733 

30.987 

31.241 

31.495 

31.749 

32.003 

32.257 

32.511 

32.765 

.3 

33.019 

33.273 

33.527 

33.781 

34.035 

34.289 

34.543 

34.797 

35.051 

35.305 

.4 

35.559 

35.813 

36.067 

36.321 

36.575 

36.829 

37.083 

37.337 

37.591 

37.845 

.5 

38.099 

38.353 

38.607 

38.861 

39.115 

39.369 

39.623 

39.877 

40.131 

40.385 

.6 

40.639 

40.893 

41.147 

41.401 

41.655 

41.909 

42.163 

42.417 

42.671 

42.925 

.7 

43.179 

43.433 

43.687 

43.941 

44.195 

44.449 

44.703 

44.957 

45.211 

45.465 

.8 

45.719 

45.973 

46.227 

46.481 

46.735 

46.989 

47.243 

47.497 

47.751 

48.005 

X.      CONVERSION    OF    ENGLISH    INCHES    INTO    FRENCH    OR    PARIS    LINES. 

1  English  Inch  =  11.259515  Paris  Lines. 

Hundredths  of  an  Inch. 

English 

Inches  and 

Tenths. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

8. 

9. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line 

Par.  line. 

Par.  line. 

0.0 

0.000 

0.113 

0.225 

0.338 

0.450 

0.563 

0.676 

0.788 

0.901 

1.013 

0.1 

1.126 

1.239 

1.351 

1.464 

1.576 

1.689 

1.802 

1.914 

2.027 

2.139 

0.2 

2.252 

2.364 

2.477 

2.590 

2.702 

2.815 

2.927 

3.040 

3.153 

3.265 

0.3 

3.378 

3.490 

3.603 

3.716 

3.828 

3.941 

4.053 

4.166 

4.279 

4.391 

0.4 

4.504 

4.616 

4.729 

4!842 

4.954 

5.067 

5.179 

5.292 

5.405 

5.517 

0.5 

5.630 

5.742 

5.855 

5.968 

6.080 

6.193 

6.305 

6.418 

6.531 

6.643 

0.6 

6.756 

6.868 

6.981 

7.093 

7.206 

7.319 

7.431 

7.544 

7.656 

7.769 

0.7 

7.882 

7.994 

8.107 

8.219 

8.332 

8.445 

8.557 

8.670 

8.782 

8.895 

0.8 

9.008 

9.120 

9.233 

9.345 

9.458 

9.571 

9.683 

9.796 

9.908 

10.021 

0.9 

10.134 

10.246 

10.359 

10.471 

10.584 

10.697 

10.809 

10.922 

11.034 

11.147 

1.0 

11.260 

11.372 

11.485 

11.597 

11.710 

11.822 

11.935 

12.048 

12.160 

12.273 

1.1 

12.385 

12.498 

12.611 

12.723 

12.836 

12.948 

13.061 

13.174 

13.286 

13.399 

1.2 

13.511 

13.624 

13.737 

13.849 

13.962 

14.074 

14.187 

14.300 

14.412 

14.525 

1.3 

14.637 

14.750 

14.863 

14.975 

15.088 

15.200 

15.313 

15.426 

15.538 

15.651 

1.4 

15.763 

15.876 

15.988 

16.101 

16.214 

16.326 

16.439 

16.551 

16.664 

16.777 

1.5 

16.889 

17.002 

17.114 

17.227 

17.340 

17.452 

17.565 

17.677 

17.790 

17.903 

1.6 

18.015 

18.128 

18.240 

18.353 

18.466 

18.578 

18.691 

18.803 

18.916 

19.029 

1.7 

19.141 

19.254 

19.366 

19.479 

19.592 

19.704 

19.817 

19.929 

20.042 

20.155 

1.8 

20.267 

20.380 

20.492 

20.605 

20.717 

20.830 

20.943 

21.055 

21.168 

21.280 

53 


XI.    CONVERSION    OF    MILLIMETRES    INTO    ENGLISH    INCHES. 
1  Metre  =  39.37079  English  Inches. 


Tenths  of  a  Millimetre. 

Millime- 

tres. 

i 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

0 

0.0000 

0.0039 

0.0079 

0.0118 

0.0157 

0.0197 

0.0236 

0.0276 

0.0315 

0.0354 

1 

0.0394 

0.0433 

0.0472 

0.0512 

0.0551 

0.0591 

0.0630 

0.0669 

0.0709 

0.0748 

2 

0.0787 

O.OS27 

O.OS66 

0.0906 

0.0945 

0.0984 

0.1024 

0.1063 

0.1102 

0.1142 

3 

0.1181 

0.1220 

0.1260 

0.1299 

0.1339 

0.1378 

0.1417 

0.1457 

0.1496 

0.1535 

4 

0.1575 

0.1614 

0.1654 

0.1693 

0.1732 

0.1772 

0.1811 

0.1850 

0.1890 

0.1929 

5 

0.1969 

0.2008 

0.2047 

0.2087 

0.2126 

0.2165 

0.2205 

0.2244 

0.2283 

0.2323 

6 

0.2362 

0.2402 

0.2441 

0.2480 

0.2520 

0.2559 

0.2598 

0.2638 

0.2677 

0.2717 

7 

0.2756 

0.2795 

0.2835 

0.2874 

0.2913 

0.2953 

0.2992 

0.3032 

0.3071 

0.3110 

8 

0.3150 

0.3189 

0.3228 

0.3268 

0.3307 

0.3347 

0.3386 

0.3425 

0.3465 

0.3504 

9 

0.3543 

0.3583 

0.3622 

0.3661 

0.3701 

0.3740 

0.3780 

0.3819 

0.3858 

0.3898 

10* 

0.3937 

0.3976 

0.4016 

0.4055 

0.4095 

0.4134 

0.4173 

0.4213 

0.4252 

0.4291 

11 

0.4331 

0.4370 

0.4410 

0.4449 

0.4488 

0.4528 

0.4567 

0.4606 

0.4646 

0.4685 

12 

0.4724 

0.4764 

0.4803 

0.4843 

0.4882 

0.4921 

0.4961 

0.5000 

0.5039 

0.5079 

13 

0.5118 

0.5158 

0.5197 

0.5236 

0.5276 

0.5315 

0.5354 

0.5394 

0.5433 

0.5473 

14 

0.5512 

0.5551 

0.5591 

0.5630 

0.5669 

0.5709 

0.5748 

0.5788 

0.5827 

0.5866 

15 

0.5906 

0.5945 

0.5984 

0.6024 

0.6063 

0.6102 

0.6142 

0.6181 

0.6221 

0.6260 

16 

0.6299 

0.6339 

0.6378 

0.6417 

0.6457 

0.6496 

0.6536 

0.6575 

0.6614 

0.6654 

17 

0.6693 

0.6732 

0.6772 

0.6811 

0.6851 

0.6890 

0.6929 

0.6969 

0.7008 

0.7047 

18 

0.7087 

0.7126 

0.7165 

0.7205 

0.7244 

0.7284 

0.7323 

0.7362 

0.7402 

0.7441 

19 

0.7480 

0.7520 

0.7559 

0.7599 

0.7638 

0.7677 

0.7717 

0.7756 

0.7795 

0.7835 

20 

0.7874 

0.7914 

0.7953 

0.7992 

0.8032 

0.8071 

0.8110 

0.8150 

0.8189 

0.8228 

21 

0.8268 

0.8307 

0.8347 

0.8386. 

0.8425 

0.8465 

0.8504 

0.8543 

0.8583 

0.8622 

22 

0.8662 

0.8701 

0.8740 

0.8780 

0.8819 

0.8858 

0.8898 

0.8937 

0.8977 

0.9016 

23 

0.9055 

0.9095 

0.9134 

0.9173 

0.9213 

0.9252 

0.9292 

0.9331 

0.9370 

0.9410 

24 

0.9449 

0.9488 

0.9528 

0.9567 

0.9606 

0.9646 

0.9685 

0.9725 

0.9764 

0.9803 

25 

0.9843 

0.9882 

0.9921 

0.9961 

.0000 

1.0040 

1.0079 

1.0118 

1.0158 

.0197 

26 

1.0236 

1.0276 

1.0315 

1.0355 

.0394 

.0433 

1.0473 

1.0512 

1.0551 

.0591 

27 

1.0630 

1.0669 

1.0709 

1.0748 

.0788 

.0827 

1.0866 

1.0906 

1.0945 

.0984 

28 

1.1024 

1.1063 

1.1103 

1.1142 

.1181 

.1221 

1.1260 

1.1299 

1.1339 

.1378 

29 

1.1418 

1.1457 

1.1496 

1.1536 

.1575 

.1614 

1.1654 

1.1693 

1.1732 

.1772 

30 

1.1811 

1.1851 

1.1890 

1.1929 

.1969 

.2008 

1.2047 

1.2087 

1.2126 

.2166 

31 

1.2205 

1.2244 

1.2284 

1.2323 

.2362 

.2402 

1.2441 

1.2481 

1.2520 

.2559 

32 

1.2599 

1.2638 

1.2677 

1.2717 

.2756 

.2796 

1.2835 

1.2874 

1.2914 

.2953 

33 

1.2992 

1.3032 

1.3071 

1.3110 

.3150 

.3189 

1.3229 

1.3268 

1.3307 

.3347 

34 

1.3386 

1.3425 

1.3465 

1.3504 

.3544 

.3583 

1.3622 

1.3662 

1.3701 

.3740 

35 

1.3780 

1.3819 

1.3859 

1.3898 

.3937 

1.3977 

1.4016 

1.4055 

1.4095 

1.41341 

36 

1.4173 

1.4213 

1.4252 

1.4292 

.4331 

1.4370 

1.4410 

1.4449 

1.4488 

1.4528 

37 

1.4567 

1.4607 

1.4646 

1.4685 

1.4725 

1.4764 

1.4803 

1.4843 

1.4882 

1.4922 

38 

1.4961 

1.5000 

1.5040 

1.5079 

1.5118 

1.5158 

1.5197 

1.5236 

1.5276 

1.5315 

39 

1.5355 

1.5394 

1.5433 

1.5473 

1.5512 

1.5551 

1.5591 

1.5630 

1.5670 

1.5709 

40 

1.5748 

1.5788 

1.5827 

1.5866 

1.5906 

1.5945 

1.5985 

1.6024 

1.6063 

1.6103 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

0. 

54 


XII.    CONVERSION    OF    MILLIMETRES    INTO    FRENCH    OR    PARIS    LINES. 
1  Millimetre  =  0.443296  Paris  Line. 


Millime- 

Tenths of  a  Millimetre. 

tres. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

V. 

8. 

9» 

Par.  line.  '  Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line 

Par.  line. 

0 

0.000 

0.044 

0.089 

0.133 

0.177 

0.222 

0.266 

0.310 

0.355 

0.399 

1 

0.443 

0.488 

0.532 

0.576 

0.621 

0.665 

0.709 

0.754 

0.798 

0.842 

2 

0.887 

0.931 

0.975 

1.020 

1.064 

1.108 

1.153 

1.197 

1.241 

1.286 

3 

1.330 

1.374 

1.419 

1.463 

1.507 

1.552 

1.596 

1.640 

1.685 

1.729 

4 

1.773 

1.818 

1.862 

1.906 

.1.950 

1.995 

2.039 

2.083 

2.128 

2.172 

5 

2.216 

2.261 

2.305 

2.349 

2.394 

2.438 

2.482 

2.527 

2.571 

2.615 

6 

2.660 

2.704 

2.748 

2.793 

2.837 

2.881 

2.926 

2.970 

3.014 

3.059 

7 

3.103 

3.147 

3.192 

3.236 

3.280 

3.325 

3.369 

3.413 

3.458 

3.502 

8 

3.546 

3.591 

3.635 

3.679 

3.724 

3.768 

3.812 

3.857 

3.901 

3.945 

9 

3.990 

4.034 

4.078 

4.123 

4.167 

4.211 

4.256 

4.300 

4.344 

4.389 

10 

4.433 

4.477 

4.522 

4.566 

4.610 

4.655 

4.699 

4.743 

4.788 

4.832 

11 

4.876 

4.921 

4.965 

5.009 

5.054 

5.098 

5.142 

5.187 

5.231 

5.275 

12 

5.320 

5.364 

5.408 

5.453 

5.497 

5.541 

5.586 

5.630 

5.674 

5.719 

13 

5.763 

5.807 

5.851 

5.896 

5.940 

5.984 

6.029 

6.073 

6.117 

6.162 

14 

6.206 

6.250 

6.295 

6.339 

6.383 

6.428 

6.472 

6.516 

6.561 

6.605 

15 

6.649 

6.694 

6.738 

6.782 

6.827 

6.871 

6.915 

6.960 

7.004 

7.048 

16 

7.093 

7.137 

7.181 

7.226 

7.270 

7.314 

7.359 

7.403 

7.447 

7.492 

17 

7.536 

7.580 

7.625 

7.669 

7.713 

7.758 

7.802 

7.846 

7.891 

7.935 

18 

7.979 

8.024 

8.068 

8.112 

8.157 

8.201 

8.245 

8.290 

8.334 

8.378 

19 

8.423 

8.467 

8.511 

8.556 

8.600 

8.644 

8.689 

8.733 

8.777 

8.822 

20 

8.866 

8.910 

8.955 

8.999 

9.043 

9.088 

9.132 

9.176 

9.221 

9.265 

21 

9.309 

9.354 

9.398 

9.442 

9.487 

9.531 

9.575 

9.620 

9.664 

9.708 

22 

9.753 

9.797 

9.841 

9.886 

9.930 

9.974 

10.018 

10.063 

10.107 

10.151 

23 

10.196 

10.240 

10.284 

10.329 

10.373 

10.417 

10.462 

10.506 

10.550 

10.595 

24 

10.639 

10.683 

10.728 

10.772 

10.816 

10.861 

10.905 

10.949 

10.994 

11.038 

25 

11.082 

11.127 

11.171 

11.215 

11.260 

11.304 

11.348 

11.393 

11.437 

11.481 

26 

11.526 

11.570 

11.614 

11.659 

11.703 

11.747 

11.792 

11.836 

11.880 

11.925 

27 

11.969 

12.013 

12.058 

12.102 

12.146 

12.191 

12.235 

12.279 

12.324 

12.368 

28 

12.412 

12.457 

12.501 

12.545 

12.590 

12.634 

12.678 

12.723 

12.767 

12.811 

29 

12.856 

12.900 

12.944 

12.989 

13.033 

13.077 

13.122 

13.166 

13.210 

13.255 

30 

13.299 

13.343 

13.388 

13.432 

13.476 

13.521 

13.565 

13.609 

13.654 

13.698 

31 

13.742 

13.786 

13.831 

13.875 

13.919 

13.964 

14.008 

14.052 

14.097 

14.141 

32 

14.185 

14.230 

14.274 

14.318 

14.363 

14.407 

14.451 

14.496 

14.540 

14.584 

33 

14.629 

14.673 

14.717 

14.762 

14.806 

14.850 

14.895 

14.939 

14.983 

15.028 

34 

15.072 

15.116 

15.161 

15.205 

15.249 

15.294 

15.338 

15.382 

15.427 

15.471 

35 

15.515 

15.560 

15.604 

15.648 

15.693 

15.737 

15.781 

15.826 

15.870 

15.914 

36 

15.959 

16.003 

16.047 

16.092 

16.136 

16.180 

16.225 

16.269 

16.313 

16.358 

37 

16.402 

16.446 

16.491 

16.535 

16.579 

16.624 

16.668 

16.712 

16.757 

16.801 

38 

16.845 

16.890 

16.934 

16.978 

17.023 

17.067 

17.111 

17.156 

17.200 

17.244 

39 

17.289 

17.333 

17.377 

17.422 

17.466 

17.510 

17.555 

17.599 

17.643 

17.688 

40 

17.732 

17.776 

17.820 

17.865 

17.909 

17.953 

17.998 

18.042 

18.086 

18.131 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

55 


XIII.   CONVERSION    OF    THE    FRENCH    OR    PARIS    LINES    INTO    MILLIMETRES. 
1  Paris  Line  =  2.255829  Millimetres. 


Tenths  of  a  Line. 

Paris 

Lines. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.000 

0.226 

0.451 

0.677 

0.902 

1.128 

1.353 

1.579 

1.805 

2.030 

1 

2.256 

2.481 

2.707 

2.933 

3.158 

3.384 

3.609 

3.835 

4.060 

4.286 

2 

4.512 

4.737 

4.963 

5.188 

5.414 

5.640 

5.865 

6.091 

6.316 

6.542 

3 

6.767 

6.993 

7.219 

7.444 

7.670 

7.895 

8.121 

8.347 

8.572 

8.798 

4 

9.023 

9.249 

9.474 

9.700 

9.926 

10.151 

10.377 

10.602 

10.828 

11.054 

5 

11.279 

11.505 

11.730 

11.956 

12.181 

12.407 

12.633 

12.858 

13.084 

13;309 

6 

13.535 

13.761 

13.986 

14.212 

14.437 

14.663 

14.888 

15.114 

15.340 

15.565 

7 

15.791 

16.016 

16.242 

16.468 

16.693 

16.919 

17.144 

17.370 

17.595 

17.821 

8 

18.047 

18.272 

18.498 

18.723 

18.949 

19.175 

19.400 

19.626 

19.851 

20.077 

9 

20.302 

20.528 

20.754 

20.979 

21.205 

21.430 

21.656 

21.882 

22.107 

22.333 

10 

22.558 

22.784 

23.009 

23.235 

23.461 

23.686 

23.912 

24.137 

24.363 

24.589 

11 

24.814 

25.040 

25.265 

25.491 

25.716 

25.942 

26.168 

26.393 

26.619 

26.844 

12 

27.070 

27.296 

27.521 

27.747 

27.972 

28.198 

28.423 

28.649 

28.875 

29.100 

13 

29.326 

29.551 

29.777 

30.003 

30.228 

30.454 

30.679 

30.905 

31.130 

31.356 

14 

31.582 

31.807 

32.033 

32.258 

32.485 

32.711 

32.936 

33.162 

33.387 

33.613 

15 

33.837 

34.063 

34.289 

34.514 

34.740 

34.965 

35.191 

35.417 

35.642 

35.868 

16 

36.093 

36.319 

36.544 

36.770 

36.996 

37.221 

37.447 

37.672 

37.898 

38.124 

17 

38.349 

38.575 

38.800 

39.026 

39.251 

39.477 

39.703 

39.928 

40.154 

40.379 

18 

40.605 

40.831 

41.056 

41.282 

41.507 

41.733 

41.958 

42.184 

42.410 

42.635 

XIV.  CONVERSION    OF    FRENCH    OR    PARIS    LINES    INTO    ENGLISH    INCHES. 

1  Paris  Line  =  0.088814  English  Inch. 

Tenths  of  a  Line. 

Paris 

Lines. 

i 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

Eng.  In. 

0 

0.0000 

0.0089 

0.0178 

0.0266 

0.0355 

0.0444 

0.0533 

0.0622 

0.0711 

0.0799 

1 

0.0888 

0.0977 

0.1066 

0.1155 

0.1243 

0.1332 

0.1421 

0.1510 

0.1599 

0.1687 

2 

0.1776 

0.1865 

0.1954 

0.2043 

0.2132 

0.2220 

0.2309 

0.2398 

0.2487 

0.2576 

3 

0.2664 

0.2753 

0.2842 

0.2931 

0.3020 

0.3108 

0.3197 

0.3286 

0.3375 

0.3464 

4 

0.3553 

0.3641 

0.3730 

0.3819 

0.3908 

0.3997 

0.4085 

0.4174 

0.4263 

0.4352 

5 

0.4441 

0.4530 

0.4618 

0.4707 

0.4796 

0.4885 

0.4974 

0.5062 

0.5151 

0.5240 

6 

0.5329 

0.5418 

0.5506 

0.5595 

0.5684 

0.5773 

0.5862 

0.5951 

0.6039 

0.6128 

7 

0.6217 

0.6306 

0.6395 

0.6483 

0.6572 

0.6661 

0.6750 

0.6839 

0.6927 

0.7016 

8 

0.7105 

0.7194 

0.7283 

0.7372 

0.7460 

0.7549 

0.7638 

0.7727 

0.7816 

0.7904 

9 

0.7993 

0.8082 

0.8171 

0.8260 

0.8349 

0.8437 

0.8526 

0.8615 

0.8704 

0.8793 

10 

0.8881 

0.8970 

0.9059 

0.9148 

0.9237 

0.9325 

0.9414 

0.9503 

0.9592 

0.9681 

11 

0.9770 

0.9858 

0.9947 

1.0036 

1.0125 

1.0214 

1.0302 

1.0391 

1.0480 

1.0569 

12 

.0658 

.0746 

1.0835 

.0924 

.1013 

.1102 

1.1191 

1.1279 

1.1368 

1.1457 

13 

.1546 

.1635 

1.1723 

.1812 

.1901 

.1990 

1.2079 

1.2168 

1.2256 

1.2345 

14 

.2434 

.2523 

1.2612 

.2700 

.2789 

.2878 

1.2967 

.3056 

1.3144 

1.3233 

15 

.3322 

.3411 

1.3500 

.3589 

.3677 

.3766 

1.3855 

.3944 

1.4033 

1.4121 

16 

.4210 

.4299 

1.4388 

.4477 

.4565 

.4654 

1.4743 

.4832 

1.4921 

1.5010 

17 

.5098 

.5187 

1.5276 

.5365 

.5454 

.5542 

1.5631 

.5720 

1.5809 

1  .5898 

18 

.5987 

.6075 

1.6164 

.6253 

.6342 

.6431 

1.6519 

.6608 

1.6697 

1.6786 

56 


XV.      CONVERSION    OF    RUSSIAN    HALF-LINES    INTO    MILLIMETRES. 


1  Russian  Half-Line  =  1.269977  Millimetres. 


Russian 
Half-Lines. 

Tenths. 

o. 

1. 

2.          3. 

4. 

5. 

6. 

7. 

8. 

9. 

Millim. 

Millim. 

Millim. 

MilUm. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.000 

0.127 

0.254 

0.381 

0.508 

0.635 

0.762 

0.889 

1.016 

1.143 

1 

1.270 

1.397 

1.524 

1.651 

1.778 

1.905 

2.032 

2.159 

2.286 

2.413 

2 

2.540 

'2.667 

2.794 

2.921 

3.048 

3.175 

3.302 

3.429 

3.556 

3.683 

1 

3.810 

3.937 

4.064 

4.191 

4.318 

4.445 

4.572 

4.699 

4.826 

4.953 

4 

5.080 

5.207 

5.334 

5.461 

5.588 

5.715 

5.842 

5.969 

6.096 

6.223 

5 

6.350 

6.477 

6.604 

6.731 

6.858 

6.985 

7.112 

7.239 

7.366 

7.493 

6 

7.620 

7.747 

7.874 

8.001 

8.128 

8.255 

8.382 

8.509 

8.636 

8.763 

7 

8.890 

9.017 

9.144 

9.271 

9.398 

9.525 

9.652 

9.779 

9.906 

10.033 

8 

10.160 

10.287 

10.414 

10.541 

10.668 

10.795 

10.922 

11.049 

11.176 

11.303 

9 

11.430 

11.557 

11.684 

11.811 

11.938 

12.065 

12.192 

12.319 

12.446 

12.573 

10 

12.700 

12.827 

12.954 

13.081 

13.208 

13.335 

13.462 

13.589 

13.716 

13.843 

11 

13.970 

14.097 

14.224 

14.351 

14.478 

14.605 

14.732 

14.859 

14.986 

15.113 

12 

15.240 

15.367 

15.494 

15.621 

15.748 

15.875 

16.002 

16.129 

16.256 

16.383 

13 

16.510 

16.637 

16.764 

16.891 

17.018 

17.145 

17.272 

17.399 

17.526 

17.653 

14 

17.780 

17.907 

18.034 

18.161 

18.288 

18.415 

18.542 

18.669 

18.796 

18.923 

15 

19.050 

19.177 

19.304 

19.431 

19.558 

19.685 

19.812 

19.939 

20.066 

20.193 

16 

20.320 

20.447 

20.574 

20.701 

20.828 

20.955 

21.082 

21.209 

21.336 

21.463 

17 

21.590 

21.717 

21.844 

21.971 

22.098 

22.225 

22.352 

22.479 

22.606 

22.733 

18 

22.860 

22.987 

23.114 

23.241 

23.368 

23.495 

23.622 

23.749 

23.876 

24.003 

XVI.    CONVERSION    OF    RUSSIAN   HALF-LINES    INTO    PARIS   LINES. 

1  Russian  Half-Line  =  0.562976  Paris  Line. 

Russian 
Half-Lines. 

Tenths. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line. 

Par.  line 

Par.  line 

Par.  line. 

Par.  line. 

0 

0.000 

0.056 

0.113 

0.169 

0.225 

0.281 

0.338 

0.394 

0.450 

0.507 

1 

0.563 

0.619 

0.676 

0.732 

0.788 

0.844 

0.901 

0.957 

1.013 

1.070 

2 

1.126 

1.182 

1.239 

1.295 

1.351 

1.407 

1.464 

1.520 

1.576 

1.633 

3 

1.689 

1.745 

1.802 

1.858 

1.914 

1.970 

2.027 

2.083 

2.139 

2.196 

4 

2.252 

2.308 

2.364 

2.421 

2.477 

2.533 

2.590 

2.646 

2.702 

2.759 

5 

2.815 

2.871 

2.927 

2.984 

3.040 

3.096 

3.153 

3.209 

3.265 

3.322 

6 

3.378 

3.434 

3.490 

3.547 

3.603 

3.659 

3.716 

3.772 

3.828 

3.885 

7 

3.941 

3.997 

4.053 

4.110 

4.166 

4.222 

4.279 

4.335 

4.391 

4.448 

8 

4.504 

4.560 

4.616 

4.673 

4.729 

4.785 

4.842 

4.898 

4.954 

5.010 

9 

5.067 

5.123 

5.179 

5.236 

5.292 

5.348 

5.405 

5.461 

5.517 

5.573 

10 

5.630 

5.686 

5.742 

5.799 

5.855 

5.911 

5.968 

6.024 

6.080 

6.136 

11 

6.193 

6.249 

6.305 

6.362 

6.418 

6.474 

6.531 

6.587 

6.643 

6.699 

12 

6.756 

6.812 

6.868 

6.925 

6.981 

7.037 

7.093 

7.150 

7.206 

7.262 

13 

7.319 

7.375 

7.431 

7.488 

7.544 

7.600 

7.656 

7.713 

7.769 

7.825 

14 

7.882 

7.938 

7.994 

8.051 

8.107 

8.163 

8.219 

8.276 

8.332 

8.388 

15 

8.445 

8.501 

8.557 

8.614 

8.670 

8.726 

8.782 

8.839 

8.895 

8.951 

16 

9.008 

9.064 

9.120 

9.177 

9.233 

9.289 

9.345 

9.402 

9.458 

9.514 

17 

9.571 

9.627 

9.683 

9.739 

9.796 

9.852 

9.908 

9.965 

10.021 

10.077 

18 

10.134 

10.190 

10.246 

10.302 

10.359 

10.415 

10.471 

10.528 

10.584 

10.640 

57 


TABLES 


REDUCING   BAROMETRICAL   OBSERVATIONS, 


TAKEN  AT  ANY  TEMPERATURE, 


TO   THE   TEMPERATURE   OF   THE  FREEZING  POINT. 


59 


TABLES 

FOB 

REDUCING  THE  BAROMETRICAL  OBSERVATIONS  TAKEN  AT  ANY  TEMPERATURE  TO  THE 
TEMPERATURE  OF  THE  FREEZING  POINT. 


THE  variations  of  the  mercurial  column  in  a  stationary  barometer  are  due  to  two 
causes,  the  changes  of  atmospheric  pressure  and  the  variations  of  temperature  of  the 
mercury,  which  affect  the  length  of  the  column  by  changing  its  density.  The  varia- 
tions of  atmospheric  pressure,  which  alone  the  barometer  is  destined  to  ascertain,  are 
therefore  hidden,  and  their  observation  falsified  by  the  expansion  or  contraction  of  the 
mercury  due  to  changes  of  temperature.  For,  supposing  that,  while  the  atmospheric 
pressure  remains  the  same,  the  temperature  of  the  instrument  becomes  lower,  the 
mercurial  column  will  become  shorter,  and  the  barometer  will  appear  to  fall ;  if  the 
pressure  becomes  less,  but  the  temperature  increases,  the  expansion  of  the  mercury 
will  tend  to  compensate  the  diminution  of  pressure,  and  the  barometer  may  remain 
stationary,  or  even  may  rise,  while  it  ought  to  be  falling  ;  in  other  cases  the  action 
of  temperature  will  tend  to  increase  the  amount  of  the  changes  of  the  barometrical 
height.  It  is  therefore  evident  that  successive  observations,  with  the  same  barometer, 
do  not  give  directly  the  actual  changes  of  atmospheric  pressure,  unless  they  have 
been  taken  exactly  at  the  same  temperature,  a  case  which,  in  practice,  seldom  occurs. 
Likewise  simultaneous  observations,  taken  with  various  barometers,  do  not  give 
directly  the  actual  differences  of  the  absolute  pressure  of  the  atmosphere  above  the 
instruments.  To  obtain  the  true  barometrical  heights,  that  is,  the  action  of  the  at- 
mospheric pressure  alone,  the  influence  of  the  temperature  must  first  be  eliminated 
from  the  observed  heights.  This  is  done  by  reducing,  by  means  of  the  following 
Tables,  the  various  barometrical  columns  to  the  length  they  would  have  at  a  given 
temperature,  which  is  the  same  for  all.  For  the  sake  of  convenient  comparison, 
the  freezing  point  has  been  almost  universally  adopted  as  the  standard  temperature 
to  which  all  observations  are  to  be  reduced. 

CONSTRUCTION  OF  THE  TABLES. 

In  all  the  following  Tables  the  barometers  are  supposed  to  be  furnished  with  brass 
scales,  extending  from  the  surface  of  the  mercury  in  the  cistern  to  the  top  of  the 
mercurial  column.  The  correction  to  be  applied  is  therefore  composed  of  two  ele- 
ments :  the  correction  for  the  expansion  of  the  mercury,  and  that  for  the  expansion 
of  the  scale  ;  both  of  which  ought  to  be,  and  have  been,  taken  into  account. 

Indeed,  the  correction  for  the  expansion  of  mercury  is  not  sufficient  to  reduce  the 
readings  to  the  height  which  the  barometer  would  indicate,  under  the  same  pressure, 
at  the  temperature  of  the  freezing  point.  For  when  the  temperature  rises  the  mer- 
curial column  expands  ;  but  then  the  scale  also  grows  longer,  and  this  will  tend  to 
lower  the  reading  of  the  height,  The  correction  for  the  expansion  of  the  mercury 

C  61 


TABLES    FOR   REDUCING   BAROMETRICAL    OBSERVATIONS. 

must  thus  be  diminished  by  the  amount  of  that  of  the  scale,  that  is,  by  nearly  -jfo, 
this  being  the  proportion  between  the  expansion  of  brass  and  that  of  mercury. 

It  is  also  the  expansion  of  the  scale  which  causes  an  apparent  anomaly  in  the 
Tables  for  the  Reduction  of  the  English  and  Old  French  Barometers.  It  can  be 
seen,  that,  though  the  observations  are  to  be  reduced  to  the  freezing  point,  or  to 
32°  Fahrenheit  and  zero  Reaumur,  the  Tables  give  still  a  correction  for  observa- 
tions taken  at  that  temperature.  The  reason  of  it  is,  that  the  normal  length  of  the 
English  and  Old  French  standards  has  not  been  determined  at  the  temperature  of  the 
freezing  point,  as  is  the  case  with  the  metre,  but  respectively  at  the  temperatures 
of  62°  Fahrenheit  and  13°  Reaumur.  It  is  thus  only  at  these  temperatures  that  the 
scales  graduated  with  these  standards  have  their  true  length.  Above  and  below,  the 
inches  of  the  scales  are  longer  or  shorter  than  the  inches  of  the  standards.  At  the 
freezing  point,  therefore,  the  correction  for  the  expansion  of  the  mercury  is  null,  but 
that  for  the  expansion  of  the  scale  is  not.  The  scale  being  too  short,  the  reading 
will  be  too  high,  and  a  subtractive  correction  must  still  be  applied,  which  will  be 
gradually  compensated  at  lower  temperatures  by  the  now  additive  correction  of  the 
mercurial  column.  Thus  the  point  of  no  correction  will  occur  at  28°.  5  Fahrenheit, 
instead  of  32°,  in  the  English  Barometer,  and  at  —  1°.5  Reaumur,  instead  of  zero, 
in  the  Old  French. 

Schumacher  has  calculated  and  published  in  his  Collection  of  Tables  ,  &c.,  and  in 
his  Jahrbuch  for  1836,  1837,  and  1838,  extensive  tables  for  the  reduction  of  the  Eng- 
lish, Old  French,  and  Metrical  Barometers,  using  the  following  general  formula  :  — 
Let  h  =  observed  height. 

"  t    =  temperature  of  the  attached  thermometer. 

«   T  =  temperature  to  which  the  observed  height  is  to  be  reduced. 

"  m  =  expansion,  in  volume,  of  mercury. 

"  I    =  linear  expansion  of  brass. 

"  #  =  normal  temperature  of  the  standard  scale. 
The  reduction  to  the  freezing  point  will  be  given  by  the  formula,  — 

,     m(t-T)-l<t  —  $) 
l+nl(t-T) 

The  following  tables,  which  may  be  found  more  convenient  for  ordinary  use,  have 
been  calculated  after  the  same  formula.  Table  XVII.,  published  in  the  Instructions 
of  the  Royal  Society  of  London,  is  mostly  abstracted  from  the  table  of  Schumacher. 
It  gives  the  reduction  of  the  English  Barometer,  adopting  the  following  values  :  — 

Let  h  =  observed  height  in  English  inches. 

"    t    =  temperature  of  attached  thermometer  in  degrees  of  Fahrenheit. 

«    m  =  expansion,  in  volume,  of  mercury  for  one  degree  Fahrenheit  =  0.0001001. 

"    I    =  linear  expansion  of  brass  for  one  degree  Fahrenheit  =  0.0000104344. 

The  normal  temperature  of  standard  being  =  62°. 

The  reduction  to  32°  Fahrenheit  will  be  given  then  by  the  formula, 

_      m  m(t  —  32)  —  l(t  —  62) 


The  elements  for  the  other  tables  are  found  at  the  head  of  each. 
C  62 


XVII. 


ENGLISH     BAROMETER 


TABLE 

GIVING  THE  CORRECTION  TO  BE  APPLIED  TO  ENGLISH 

BAROMETERS, 

WITH    BRASS    SCALES   EXTENDING    FROM    THE    CISTERN    TO    THE    TOP    OF 

THE    MERCURIAL    COLUMN,    FOR    REDUCING   THE    OBSERVATIONS 

TO    THIRTY-TWO    DEGREES    FAHRENHEIT. 


63 


TABLE  XVII. 

THE  following  Table,  calculated  after  that  of  Schumacher,  has  been  adopted  by  the 
Committee  of  Physics  and  Meteorology  of  the  Royal  Society  of  London.  It  gives 
immediately  the  correction  for  every  degree  of  Fahrenheit,  and  for  every  half-inch 
from  20  up  to  31  inches.  The  scale  of  the  barometer  is  supposed  to  be  of  brass, 
extending  from  the  cistern  to  the  top  of  the  mercurial  column.  The  difference  of  ex- 
pansion of  brass  and  mercury  is  taken  into  account.  The  standard  temperature  of 
the  yard  being  62°  Fahr.,  and  not  32°  Fahr.,  the  difference  of  expansion  of  the  scale 
and  of  the  mercurial  column  carries  the  point  of  no  correction  down  to  29°  Fahr. 
Therefore,  from  29°  up  the  correction  must  be  subtracted  from,  from  29°  down  it  must 
be  added  to,  the  observed  height. 

Examples  of  Calculation. 

Barometer,  observed  height,       .....         30.231 

Attached  thermometer  82°  Fahr. 

See  in  the  last  page  the  column  of  30  inches ;  go  down  as  far  as  the  horizontal 
line  corresponding  with  82°  in  the  first  vertical  column,  which  contains  the  tempera- 
tures ;  you  will  find  there  the  correction  — .143.  We  have  thus  :  — 

Barometer,  observed  height, 30.231 

Subtractive  correction  for  82°  Fahr.,  .        .        .      —0.143 

Barometer  at  32°  Fahr.,  .         .         , 

Barometer,  observed  height,  •        .         •        • 

Attached  thermometer  25°  Fahr. 

.   The  column  of  29.5  inches  opposite  to  25°  Fahr.  gives  an 
additive  correction  of, 

Barometer  at  32°  Fahr., 

It  will  be  easy  to  apply  also  the  correction  for  fractions  of  a  degree  Fahrenheit ; 
for  example  :  — 

Barometer,  observed  height,        .         .         .         •        .        28.358 

Attached  thermometer  71.3 

In  the  column  of  28.5  inches,  we  find  that  the  difference  between 
the  correction  for  71°  and  that  for  72°  is  .003;  dividing  this  differ- 
ence proportionally  to  the  fraction,  we  have  for  three  tenths  of  a  de- 
gree a  correction  of  — .001,  which  added  to  — .108,  the  correction 
for  71°,  makes  a  total  correction  of,  .  3  .  .  — .109 


And  barometer  at  32°  Fahr.,    .        .        .        28.249 
65 


XVII.     REDUCTION    OF    THE    ENGLISH    BAROMETER    TO    THE    FREEZING    POINT. 


Degrees 
of  Fah- 
renheit. 

English  Inches. 

Degrees 
of  Fah- 
renheit. 

20 

20.5 

21 

21.5 

22 

22.5 

23 

23.5 

0 

0 

+  .051 

+.053 

+.054 

+.055 

+.056 

+.058 

+.059 

+.060 

°0 

1 

.049 

.051 

.052 

.053 

.054 

.056 

.057 

.058 

1 

2 

.048 

.049 

.050 

.051 

.052 

.054 

.055 

.056 

2 

3 

.046 

.047 

.048 

.049 

.050 

.052 

.053 

.054 

3 

4 

.044 

.045 

.046 

.047 

.048 

.050 

.051 

.052 

4 

5 

.042 

.043 

.044 

.045 

.046 

.048 

.049 

.050 

5 

6 

+.040 

+  .042 

+.042 

+.044 

+.044 

+.046 

+.047 

+.048 

6 

7 

.039 

.040 

.041 

.042 

.042 

.044 

.044 

.046 

7 

8 

.037 

.038 

.039 

.040 

.041 

.041 

.042 

.043 

8 

9 

.035 

.036 

.037 

.038 

.039 

.039 

.040 

.041 

9 

10 

.033 

.034 

.035 

.036 

.037 

.037 

.038 

.039 

10 

11 

+.031 

+.032 

+.033 

+.034 

+.035 

+.035 

+.036 

+.037 

11 

12 

.030 

.030 

.031 

.032 

.033 

.033 

.034 

.035 

12 

13 

.028 

.029 

.029 

.030 

.031 

.031 

.032 

.033 

13 

14 

.026 

.027 

.027 

.028 

.029 

.029 

.030 

.031 

14 

15 

.024 

.025 

.026 

.026 

.027 

.027 

.028 

.029 

15 

16 

+.022 

+.023 

+.024 

+.024 

+.025 

+.025 

+.026 

+.026 

16 

17 

.021 

.021 

.022 

.022 

.023 

.023 

.024 

.024 

17 

18 

.019 

.019 

.020 

.020 

.021 

.021 

.022 

.022 

18 

19 

.017 

.018 

.018 

.018 

.019 

.019 

.020 

.020 

19 

20 

.015 

.016 

.016 

.016 

.017 

.017 

.018 

.018 

20 

21 

+.014 

+.014 

+.014 

+.015 

+.015 

+.015 

+.015 

+.016 

21 

22 

.012 

.012 

.012 

.013 

.013 

.013 

.013 

.014 

22 

23 

.010 

.010 

.010 

.011 

.011 

.011 

.011 

.012 

23 

24 

.008 

.008 

.009 

.009 

.009 

.009 

.009 

.010 

24 

25 

.006 

.007 

.007 

.007 

.007 

.007 

.007 

.007 

25 

26 

+.005 

+.005 

+.005 

+.005 

+.005 

+.005 

+.005 

+.005 

26 

27 

.003 

.003 

.003 

.003 

.003 

.003 

.003 

.003 

27 

28 

.001 

.001 

.001 

.001 

.001 

.001 

.001 

.001 

28 

29 

-.001 

-.001 

-.001 

-.001 

-.001 

-.001 

-.001 

-.001 

29 

30 

.003 

.003 

.003 

.003 

.003 

.003 

.003 

.003 

30 

31     > 

-.005 

-.005 

-.005 

-.005 

-.005 

-.005 

-.005 

-.005 

31 

32 

.006 

.006 

.007 

.007 

.007 

.007 

.007 

.007 

32 

33 

.008 

.008 

.008 

.009 

.009 

.009 

.009 

.010 

33 

34 

.010 

.010 

.010 

.011 

.011 

.011 

.011 

.012 

34 

35 

.012 

.012 

.012 

.013 

.013 

.013 

.013 

.014 

35 

36 

-.013 

-.014 

-.014 

-.014 

-.015 

-.015 

-.016 

-016 

36 

37 

.015 

.016 

.016 

.016 

.017 

.017 

.018 

.018 

37 

38 

.017 

.017 

.018 

.018 

.019 

.019 

.020 

.020 

38 

39 

.019 

.019 

.020 

.020 

.021 

.021 

.022 

.022 

39 

40 

.021 

.021 

.022 

.022 

.023 

.023 

.024 

.024 

40 

41 

-.022 

-.023 

-.024 

-.024 

-.025 

-.025 

-.026 

-.026 

41 

42 

.024 

.025 

.025 

.026 

.027 

.027 

.028 

.028 

42 

43 

.026 

.027 

.027 

.028 

.029 

.029 

.030 

.031 

43 

44 

.028 

.029 

.029 

.030 

.031 

.031 

.032 

.033 

44 

45 

.030 

.030 

.031 

.032 

.033 

.033 

.034 

.035 

45 

46 

-.031 

-.032 

-.033 

-.034 

-.035 

-.035 

-.036 

-.037 

46 

47 

.033 

.034 

.035 

.036 

.036 

.037 

.038 

.039 

47 

48 

.035 

.036 

.037 

.038 

.038 

.039 

.040 

.041 

48 

49 

.037 

.038 

.039 

.040 

.040 

.041 

.042 

.043 

49 

50 

.038 

.039 

.040 

.041 

.042 

.043 

.044 

.045 

50 

66 


REDUCTION    OF    THE    ENGLISH    BAROMETER   TO    THE    FREEZING    POINT. 


Degrees 
of  Fah- 
renheit. 

English  Inches. 

Degrees 
of  Fah- 
renheit. 

20 

20.5 

21 

21.5 

22 

22.5 

23 

23.5 

o 
51 

-.040 

-.041 

-.042 

-.043 

-.044 

-.045 

-.046 

-.047 

o 
51 

52 

.042 

.043 

.044 

.045 

.046 

.047 

.048 

.049 

52 

53 

.044 

.045 

.046 

.047 

.048 

.049 

.050 

.052 

53 

54 

.046 

.047 

.048 

.049 

.050 

.051 

.052 

.054 

54 

55 

.047 

.049 

.050 

.051 

.052 

.053 

.055 

.056 

55 

56 

-.049 

-.050 

-.052 

-.053 

-.054 

-.055 

-.057 

-.058 

56 

57 

.051 

.052 

.054 

.055 

.056 

.057 

.059 

.060 

57 

58 

.053 

.054 

.055 

.057 

.058 

.059 

.061 

.062 

58 

59 

.055 

.056 

.057 

.059 

.060 

.061 

.063 

.064 

59 

60 

.056 

.058 

.059 

.061 

.062 

.063 

.065 

.066 

60 

61 

-.058 

-.060 

-.061 

-.062 

-.064 

-.065 

-.067 

-.068 

61 

62 

.060 

.061 

.063 

.064 

.066 

.067 

.069 

.070 

62 

63 

.062 

.063 

.065 

.066 

.068 

.069 

.071 

.072 

63 

64 

.063 

.065 

.067 

.068 

.070 

.071 

.073 

.075 

64 

65 

.065 

.067 

.068 

.070 

.072 

.073 

.075 

.077 

65 

66 

-.067 

-.069 

-.070 

-.072 

-.074 

-.075 

-.077 

-.079 

66 

67 

.069 

.071 

.072 

.074 

.076 

.077 

.079 

.081 

67 

68 

.071 

.072 

.074 

.076 

.078 

.079 

.081 

.083 

68 

69 

.072 

.074 

.076 

.078 

.080 

.081 

.083 

.085 

69 

70 

.074 

.076 

.078 

.080 

.082 

.083 

.085 

.087 

70 

71 

-.076 

-.078 

-.080 

-.082 

-.083 

-.085 

-.087 

-.089 

71 

72 

.078 

.080 

.082 

.084 

.085 

.087 

.089 

.091 

72 

73 

.079 

.081 

.083 

.085 

.087 

.089 

.091 

.093 

73 

74 

.081 

.083 

.085 

.087 

.089 

.091 

.093 

.095 

74 

75 

.083 

.085 

.087 

.089 

.091 

.093 

.095 

.098 

75 

76 

-.085 

-.087 

-.089 

-.091 

-.093 

-.095 

-.097 

-.100 

76 

77 

.087 

.089 

.091 

.093 

.095 

.097 

.100 

.102 

77 

78 

.088 

.091 

.093 

.095 

.097 

.099 

.102 

.104 

78 

79 

.090 

.092 

.095 

.097 

.099 

.101 

.104 

.106 

79 

80 

.092 

.094 

.096 

.099 

.101 

.103 

.106 

.108 

80 

81 

-.094 

'  -.096 

-.098 

-.101 

-.103 

-.105 

-.108 

-.110 

81 

82 

.095 

.098 

.100 

.103 

.105 

.107 

.110 

.112 

82 

83 

.097 

.100 

.102 

.104 

.107 

.109 

.112 

.114 

83 

84 

.099 

.101 

.104 

.106 

.109 

.111 

.114 

.116 

84 

85 

.101 

.103 

.106 

.108 

.111 

.113 

116 

.118 

85 

86 

-.103 

-.105 

-.108 

-.110 

-.113 

-.115 

-.118 

-.120 

86 

87 

.104 

.107 

.109 

.112 

.115 

.117 

.120 

.123 

87 

88 

.106 

.109 

.111 

.114 

.117 

.119 

.122 

.125 

88 

89 

.108 

•111 

.113 

.116 

.119 

.121 

.124 

.127 

89 

90 

.110 

.112 

.115 

.118 

.121 

.123 

.126 

.129 

90 

91 

-.111 

-.114 

-.117 

-.120 

-.122 

-.125 

-.128 

-.131 

91 

92 

.113 

.116 

.119 

.122 

.124 

.127 

.130 

.133 

92 

93 

.115 

.118 

.121 

.124 

.126 

.129 

.132 

.135 

93 

94 

.117 

.120 

.122 

.125 

.128 

.131 

.134 

.137 

94 

95 

.118 

.121 

.124 

.127 

.130 

.133 

.136 

.139 

95 

96 

-.120 

-.123 

-.126 

-.129 

-.132 

-.135 

-.138 

-.141 

96 

97 

.122 

.125 

.128 

.131 

.134 

.137 

.140 

.143 

97 

98 

.124 

.127 

.130 

.133 

.136 

.139 

.142 

.145 

98 

99 

.125 

.129 

.132 

.135 

.138 

.141 

.144 

.147 

99 

100 

.127 

.130 

.134 

.137 

140 

.143 

.146 

.150 

100 

(J 


67 


REDUCTION    OF    THE    ENGLISH   BAROMETER   TO    THE    FREEZING    POINT. 


Degrees 
of  Fah- 
renheit. 

English  Inches. 

Degrees 
of  Fah- 
renheit. 

24 

24.5 

25 

25.5 

26 

26.5 

27 

27.5 

o 
0 

+.061 

+.063 

+.064 

+.065 

+.067 

+.068 

+.069 

+.071 

o 
0 

1 

.059 

.061 

.062 

.063 

.064 

.065 

.067 

.068 

1 

2 

.057 

.058 

.060 

.061 

.062 

.063 

.064 

.066 

2 

3 

.055 

.056 

.057 

.059 

.060 

.061 

.062 

.063 

3 

4 

.053 

.054 

.055 

.056 

.057 

.058 

.059 

.061 

4 

5 

.051 

.052 

.053 

.054 

.055 

.056 

.057 

.058 

5 

6 

+.049 

+  .050 

+.051 

+.052 

+  .053 

+.054 

+.055 

+.056 

6 

7 

.046 

.047 

.048 

.049 

.050 

.051 

.052 

.053 

7 

8 

.044 

.045 

.046 

.047 

.048 

.049 

.050 

.051 

8 

9 

.042 

.043 

.044 

.045 

.046 

.046 

.047 

.048 

9 

10 

.040 

.041 

.042 

.042 

.043 

.044 

.045 

.046 

10 

11 

+.038 

+.039 

+.039 

+.040 

+.041 

+.042 

+.042 

+.043 

11 

12 

.036 

.036 

.037 

.038 

.039 

.039 

.040 

.041 

12 

13 

.033 

.034 

.035 

.036 

.036 

.037 

.038 

.038 

13 

14 

.031 

.032 

.033 

.033 

.034 

.035 

.035 

.036 

14 

15 

.029 

.030 

.030 

.031 

.032 

.032 

.033 

.033 

15 

16 

+.027 

+.028 

+.028 

+.029 

+.029 

+.030 

+.030 

+.031 

16 

17 

.025 

.025 

.026 

.026 

.027 

.027 

.028 

.028 

17 

18 

.023 

.023 

.024 

.024 

.025 

.025 

.025 

.026 

18 

19 

.021 

.021 

.021 

.022 

.022 

.023 

.023 

.024 

19 

20 

.018 

.019 

.019 

.020 

.020 

.020 

.021 

.021 

20 

21 

+.016 

+.017 

+.017 

+.017 

+.018 

+.018 

+.018 

+.019 

21 

22 

.014 

.014 

.015 

.015 

.015 

.016 

.016 

.016 

22 

23 

.012 

.012 

.012 

.013 

.013 

.013 

.013 

.014 

23 

24 

.010 

.010 

.010 

.010' 

.011 

.011 

.011 

.011 

24 

25 

.008 

.008 

.008 

.008 

.008 

.008 

.009 

.009 

25 

26 

+.005 

+.006 

+.006 

+.006 

+.006 

+.006 

+.006 

+.006 

26 

27 

.003 

.003 

.003 

.003 

.004 

.004 

.004 

.004 

27 

28 

.001 

.001 

.001 

.001 

.001 

.001 

.001 

.001 

28 

29 

-.001 

-.001 

-.001 

-.001 

-.001 

-.001 

-.001 

-.001 

29 

30 

.003 

.003 

.003 

.004 

.004 

.004 

.004 

.004 

30 

31 

-.005 

-.006 

-.006 

-.006 

-.006 

-.006 

-.006 

-.006 

31 

32 

.008 

.008 

.008 

.008 

.008 

.008 

.008 

.009 

32 

33 

.010 

.010 

.010 

.010 

.011 

.011 

.011 

.011 

33 

34 

.012 

.012 

.012 

.013 

.013 

.013 

.013 

.014 

34 

35 

.014 

.014 

.015 

.015 

.015 

.015 

.016 

.016 

35 

36 

-.016 

-.017 

-.017 

-.017 

-.017 

-.018 

-.018 

-.019 

36 

37 

.018 

.019 

.019 

.019 

.020 

.020 

.021 

.021 

37 

38 

.020 

.021 

.021 

.022 

.022 

.023 

.023 

.023 

38 

39 

.023 

.023 

.024 

.024 

.024 

.025 

.025 

.026 

39 

40 

.025 

.025 

.026 

.026 

.027 

.027 

.028 

.028 

40 

41 

-.027 

-.027 

-.028 

-.029 

-.029 

-.030 

-.030 

-.031 

41 

42 

.029 

.030 

.030 

.031 

.031 

.032 

.033 

.033 

42 

43 

.031 

.032 

.032 

.033 

.034 

.034 

.035 

.036 

43 

44 

.033 

.034 

.035 

.035 

.036 

.037 

.037 

.038 

44 

45 

.035 

.036 

.037 

.038 

.038 

.039 

.040 

.041 

45 

46 

-.038 

-.038 

-.039 

-.040 

-.041 

-.042 

-.042 

-.043 

46 

47 

.040 

.041 

.041 

.042 

.043 

.044 

.045 

.046 

47 

48 

.042 

.043 

.044 

.045 

.045 

.046 

.047 

.048 

48 

49 

.044 

.045 

.046 

.047 

.048 

.049 

.050 

.050 

49 

50 

.046 

.047 

.048 

.049 

.050 

.051 

.052 

.053 

50 

68 


REDUCTION    OF    THE    ENGLISH    BAROMETER   TO    THE    FREEZING    POINT. 


Degrees 
of  Fah- 

English  Inches. 

Degrees 
of  Fah- 

renheit. 

24 

24.5 

25 

25.5 

26 

26.5 

27 

27.5 

renheit. 

0 

51 

-.048 

-.049 

-.050 

-.051 

-.052 

-.053 

-.054 

-.055 

0 

51 

52 

.050 

.052 

.053 

.054 

.055 

.056 

.057 

.058 

52 

53 

.053 

.054 

.055 

.056 

.057 

.058 

.059 

.060 

53 

54 

.055 

.056 

.057 

.058 

.059 

.060 

.062 

.063 

54 

55 

.057 

.058 

.059 

.060 

.062 

.063 

.064 

.065 

55 

56 

-.059 

-.060 

-.061 

-.063 

-.064 

-.065 

-.066 

-.068 

56 

57 

.061 

.062 

.064 

.065 

.066 

.068 

.069 

.070 

57 

58 

.063 

.065 

.066 

.067 

.069 

.070 

.071 

.073 

58 

59 

.065 

.067 

.068 

.070 

.071 

.072 

.074 

.075 

59 

60 

.068 

.069 

.070 

.072 

.073 

.075 

.076 

.077 

60 

61 

-.070 

-.071 

-.073 

-.074 

-.075 

-.077 

-.078 

-.080 

61 

62 

.072 

.073 

.075 

.076 

.078 

.079 

.081 

.082 

62 

63 

.074 

.076 

.077 

.079 

.080 

.082 

.083 

.085 

63 

64 

.076 

.078 

.079 

.081 

.082 

.084 

.086 

.087 

64 

65 

.078 

.080 

.082 

.083 

.085 

.086 

.088 

.090 

65 

66 

-.080 

-.082 

-.084 

-.085 

-.087 

-.089 

-.090 

-.092 

66 

67 

.083 

.084 

.086 

.088 

.089 

.091 

.093 

.095 

67 

68 

.085 

.086 

.088 

.090 

.092 

.094 

.095 

.097 

68 

69 

.087 

.089 

.090 

.092 

.094 

.096 

.098 

.100 

69 

70 

.089 

.091 

.093  . 

.095 

.096 

.098 

.100 

.102 

70 

71 

-.091 

-.093 

-.095 

-.097 

-.099 

-.101 

-.102 

-.104 

71 

72 

.093 

.095 

.097 

.099 

.101 

.103 

.105 

.107 

72 

73 

.095 

.097 

.099 

.101 

.103 

.105 

.107 

.109 

73 

74 

.097 

.099 

.102 

.104 

.106 

.108 

.110 

.112 

74 

75 

.100 

.102 

.104 

.106 

.108 

.110 

.112 

.114 

75 

76 

-.102 

-.104 

-.106 

-.108 

-.110 

-.112 

-.114 

-.117 

76 

77 

.104 

.106 

.108 

.110 

.112 

.115 

117 

.119 

77 

78 

.106 

.108 

.110 

.113 

.115 

.117 

.119 

.122 

78 

79 

.108 

.110 

.113 

.115 

.117 

.119 

.122 

.124 

79 

80 

.110 

.113 

.115 

.117 

.119 

.122 

.124 

.126 

80 

81 

-.112 

-.115 

-117 

-.119 

-.122 

-.124 

HI  26 

-.129 

81 

82 

.114 

.117 

.119 

.122 

.124 

.126 

.129 

.131 

82 

83 

.117 

.119 

.121 

.124 

.126 

.129 

.131 

.134 

83 

84 

.119 

.121 

.124 

.126 

.129 

.131 

.134 

.136 

84 

85 

.121 

.123 

.126 

.128 

.131 

.133 

.136 

.139 

85 

86 

-.123 

-.126 

-.128 

-.131 

-.133 

-.136 

-.138 

-.141 

86 

87 

.125 

.128 

.130 

.133 

.136 

.138 

.141 

.143 

87 

88 

.127 

.130 

.133 

.135 

.138 

.141 

.143 

.146 

88 

89 

.129 

.132 

.135 

.137 

.140 

.143 

.146 

.148 

89 

90 

.131 

.134 

.137 

.140 

.142 

.145 

.148 

.151 

90 

91 

-.134 

-.136 

-.139 

-.142 

-.145 

-.148 

-.150 

-.153 

91 

92 

.136 

.139 

.141 

.144 

.147 

.150 

.153 

.156 

92 

93 

.138 

.141 

.144 

.147 

.149 

.152 

.155 

.158 

93 

94 

.140 

.143 

.146 

.149 

.152 

.155 

.157 

.161 

94 

95 

.142 

.145 

.148 

.151 

.154 

.157 

.160 

.163 

95 

96 

-.144 

-.147 

-.150 

-.153 

-.156 

-.159 

-.162 

-.165 

96 

97 

.146 

.149 

.152 

.156 

.159 

.162 

.165 

.168 

97 

98 

.148 

.152 

.155 

.158 

.161 

.164 

.167 

.170 

98 

99 

.151 

.154 

.157 

.160 

.163 

.166 

.169 

.173 

99 

100 

.153 

.156 

.159 

.162 

.165 

.169 

.172 

.175 

100 

69 


REDUCTION    OF    THE    ENGLISH    BAROMETER   TO    THE    FREEZING   POINT. 


Degrees  of 
Fahren- 
heit. 

English  Inches. 

Degrees  of 
Fahren- 
heit. 

99 

28.5 

29 

29.5 

30 

30.5 

31 

o 
0 

+.072 

+.073 

+.074 

+.076 

+.077 

+.078 

+.080 

o 
0 

1 

.069 

.071 

.072 

.073 

.074 

.076 

.077 

1 

2 

.067 

.068 

.069 

.070 

.072 

.073 

.074 

2 

3 

.064 

.065 

.067 

.068 

.069 

.070 

.071 

3 

4 

.062 

.063 

.064 

.065 

.066 

.067 

.068 

4 

5 

.059 

.060 

.061 

.062 

.063 

.065 

.066 

5 

6 

+.057 

+.058 

+.059 

+.060 

+.061 

+.062 

+.063 

6 

7 

.054 

.055 

.056 

.057 

.058 

.059 

.060 

7 

8 

.052 

.053 

.054 

.054 

.055 

.056 

.057 

8 

9 

.049 

.050 

.051 

.052 

.053 

.054 

.054 

9 

10 

.047 

.047 

.048 

.049 

.050 

.051 

.052 

10 

11 

+.044 

+.045 

+.046 

+.046 

+.047 

+.048 

+.049 

11 

12 

.042 

.042 

.043 

.044 

.045 

.045 

.046 

12 

13 

.039 

.040 

.040 

.041 

.042 

.043 

.043 

13 

14 

.037 

.037 

.038 

.038 

.039 

.040 

.040 

14 

15 

.034 

.035 

.035 

.036 

.036 

.037 

.038 

15 

16 

+.032 

+.032 

+.033 

+.033 

+.034 

+.034 

+.035 

16 

17 

.029 

.030 

.030 

.031 

.031 

.032 

.032 

17 

18 

.026 

.027 

.027 

.028 

.028 

.029 

.029 

18 

19 

.024 

.024 

.025 

.025 

.026 

.026 

.027 

19 

20 

.021 

.022 

.022 

.023 

.023 

.023 

.024 

20 

21 

+.019 

+.019 

+.020 

+  .020 

+.020 

+.021 

+.021 

21 

22 

.016 

.017 

.017 

.017 

.018 

.018 

.018 

22 

23 

.014 

.014 

.014 

.015 

.015 

.015 

.015 

23 

24 

.011 

.012 

.012 

.012 

.012 

.012 

.013 

24 

25 

.009 

.009 

.009 

.009 

.009 

.010 

.010 

25 

26 

+.006 

+.006 

+.007 

+.007 

+.007 

+.007 

+.007 

26 

27 

.004 

.004 

.004 

.004 

.004 

.004 

.004 

27 

28 

.001 

.001 

.001 

.001 

.001 

.001 

.001 

28 

29 

-.001 

-.001 

-.001 

-.001 

-.001 

-.001 

-.001 

29 

30 

.004 

.004 

.004 

.004 

.004 

.004 

.004 

30 

31 

-.006 

-.006 

-.007 

-.007 

-.007 

-.007 

-.007 

31 

32 

.009 

.009 

.009 

.009 

.009 

.010 

.010 

32 

33 

.011 

.012 

.012 

.012 

.012 

.012 

.012 

33 

34 

.014 

.014 

.014 

.015 

.015 

.015 

.015 

34 

35 

.016 

.017 

.017 

.017 

.018 

.018 

.018 

35 

36 

-.019 

-.019 

-.020 

-.020 

-.020 

-.021 

-.021 

36 

37 

.021 

.022 

.022 

.022 

.023 

.023 

.024 

37 

48 

.024 

.024 

.025 

.025 

.026 

.026 

.026 

38 

39 

.026 

.027 

.027 

.028 

.028 

.029 

.029 

39 

40 

.029 

.029 

.030 

.030 

.031 

.031 

.032 

40 

41 

-.031 

-.032 

-.033 

-.033 

-.034 

-.034 

-.035 

41 

42 

.034 

.034 

.035 

.036 

.036 

.037 

.037 

42 

43 

.036 

.037 

.038 

.038 

.039 

.040 

.040 

43 

44 

.039 

.040 

.040 

.041 

.042 

.042 

.043 

44 

45 

.041 

.042 

.043 

.044 

.044 

.045 

.046 

45 

46 

-.044 

-.045 

-.045 

-.046 

-.047 

-.048 

-.049 

46 

47 

.046 

.047 

.048 

.049 

.050 

.051 

.051 

47 

48 

.049 

.050 

.051 

.052 

.052 

.053 

.054 

48 

49 

.051 

.052 

.053 

.054 

.055 

.056 

.057 

49 

50 

.054 

.055 

.056 

.057 

.058 

.059 

.060 

50 

70 


REDUCTION    OF    THE    ENGLISH    BAROMETER   TO    THE    FREEZING   POINT. 


Degrees  of 
Fahren- 
heit. 

English  Inches. 

Degrees  of 
Fahren- 
heit. 

9§ 

2§.5 

29 

29.5 

30 

3O.5 

31 

o 
51 

-.056 

-.057 

-.058 

-.059 

-.060 

-.061 

-.062 

o 
51 

52 

.059 

.060 

.061 

.062 

.063 

.064 

.065 

52 

53 

.061 

.063 

.064 

.065 

.066 

.067 

.068 

53 

54 

.064 

.065 

.066 

.067 

.068 

.070 

.071 

54 

55 

.066 

.068 

.069 

.070 

.071 

.072 

.073 

55 

56 

-.069 

-.070 

-.071 

-.073 

-.074 

-.075 

-.076 

56 

57 

.071 

.073 

.074 

.075 

.076 

.078 

.079 

57 

58 

.074 

.075 

.077 

.078 

.079 

.081 

.082 

58 

59 

.076 

.078 

.079 

.080 

.082 

.083 

.085 

59 

60 

.079 

.080 

.082 

.083 

.085 

.086 

.087 

60 

61 

-.081 

-.083 

-.084 

-.086 

-.087 

-.089 

-.090 

61 

62 

.084 

.085 

.087 

.088 

.090 

.091 

.093 

62 

63 

.086 

.088 

.089 

.091 

.093 

.094 

.096 

63 

64 

.089 

.090 

.092 

.094 

.095 

.097 

.098 

64 

65 

.091 

.093 

.095 

.096 

.098 

.100 

.101 

65 

66 

-.094 

-.096 

-.097 

-.099 

-.101 

-.102 

-.104 

66 

67 

.096 

.098 

.100 

.102 

.103 

.105 

.107 

67 

68 

.099 

.101 

.102 

.104 

.106 

.108 

.109 

68 

69 

.101 

.103 

.105 

.107 

.109 

.110 

.112 

69 

70 

.104 

.106 

.108 

.109 

.111 

.113 

.115 

70 

71 

-.106 

-.108 

-.110 

-.112 

-.114 

-.116 

-.118 

71 

72 

.109 

.111 

.113 

.115 

.117 

.119 

.120 

72 

73 

.111 

.113 

.115 

.117 

.119 

.121 

.123 

73 

74 

.114 

.116 

.118 

.120 

.122 

.124 

.126 

74 

75 

.116 

.118 

.120 

.122 

.125 

.127 

.129 

75 

76 

-.119 

-.121 

-.123 

-.125 

-.127 

-.129 

-.131 

76 

77 

.121 

.123 

.126 

.128 

.130 

.132 

.134 

77 

78 

.124 

.126 

.128 

.130 

.133 

.135 

.137 

78 

79 

.126 

.128 

.131 

.133 

.135 

.137 

.140 

79 

80 

.129 

.131 

.133 

.136 

.138 

.140 

.143 

80 

81 

-.131 

-.134 

-.136 

-.138 

.  -.141 

-.143 

-.145 

81 

82 

.134 

.136 

.138 

.141 

.143 

.146 

.148 

82 

83 

.136 

.139 

.141 

.143 

.146 

.148 

.151 

83 

84 

.139 

.141 

.144 

.146 

.149 

.151 

.154 

84 

85 

.141 

.144 

.146 

.149 

.151 

.154 

.156 

85 

86 

-.144 

-.146 

-.149 

-.151 

-.154 

-.156 

-.159 

86 

87 

.146 

.149 

.151 

.154 

.157 

.159 

.162 

87 

88 

.149 

.151 

.154 

.157 

.159 

.162 

.165 

88 

89 

.151 

.154 

.156 

.159 

.162 

.165 

.167 

89 

90 

.153 

.156 

.159 

.162 

.164 

.167 

.170 

90 

91 

-.156 

-.159 

-.162 

-.165 

-.167 

-.170 

-173 

91 

92 

.158 

.161 

.164 

.167 

.170 

.172 

.175 

92 

93 

.161 

.164 

.167 

.170 

-.172 

.175 

.178 

93 

94 

.163 

.166 

.169 

.172 

.175 

.177 

.180 

94 

95 

.166 

.169 

.172 

.175 

.178 

.180 

.183 

95 

96 

-.168 

-.171 

-.174 

-.178 

-.181 

-.183 

-.186 

96 

97 

.171 

.174 

.177 

.180 

.183 

.186 

.189 

97 

98 

.173 

.176 

.179 

.183 

.186 

.188 

.191 

98 

99 

.176 

.179 

.182 

.185 

.188 

.191 

.194 

99 

100 

.178 

.181 

.184 

.188 

.191 

.194 

.197 

100 

c 


71 


TABLE    XVIII. 

IN  most  of  the  common  barometers  the  scale  is  engraved  upon  a  short  plate  of 
brass,  fixed  upon  the  wooden  frame  of  the  instrument.  In  such  a  case,  the  com- 
pound expansion  of  the  two  substances  can  only  be  guessed  at,  and  the  correction 
to  be  applied  to  the  observations  for  reducing  them  to  the  freezing  point  cannot  be 
determined  with  precision.  As  a  near  approximation  for  such  imperfect  instruments, 
the  following  table,  taken  from  the  Instructions  of  the  Royal  Society  of  London,  may 
be  used.  In  this  table,  the  expansion  of  glass,  which  is  less  than  that  of  brass,  and 
greater  than  that  of  wood,  has  been  substituted  to  that  of  brass,  as  an  approximate 
value  for  a  scale  composed  of  these  last  two  substances. 


CORRECTION     TO     BE    APPLIED   TO     ENGLISH    BAROMETERS,    THE    SCALES    OF   WHICH 
ARE   ENGRAVED    ON    GLASS,   TO    REDUCE   THE    OBSERVATIONS 
TO    THE    FREEZING   POINT. 


Degrees  of 
Fahren- 
heit. 

Inches. 

Degrees  of 
Fahren- 
heit. 

28.0 

28.5 

29.0 

29.5 

30.0 

30.5 

31.0 

25 

+.017 

+.017 

+.017 

+.018 

+.018 

+.018 

+.019 

25 

30 

+.005 

+.005 

+.005 

+.005 

+.005 

+.005 

+.005 

30 

35 

-.007 

-.007 

-.007 

-.008 

-.008 

-.008 

-.008 

35 

40 

-.019 

-.020 

-.020 

-.020 

-.021 

-.021 

-.021 

40 

45 

-.031 

-.032 

-.032 

-.033 

-.033 

-.034 

-.035 

45 

50 

-.043 

-.044 

-.045 

-.046 

-.046 

-.047 

-.048 

50 

55 

-.055 

-.056 

-.057 

-.058 

-.059 

-.060 

-.061 

55 

60 

-.067 

-.068 

-.069 

-.071 

-.072 

-.074 

-.075 

60 

65 

-.079 

-.081 

-.082 

-.083 

-.085 

-.086 

-.088 

65 

70 

-.091 

-.093 

-.094 

-.096 

-.098 

-.100 

-.101 

70 

75 

-.103 

-.105 

-.106 

-.109 

-.111 

-.114 

-.116 

75 

80 

-.115 

-.117 

-.119 

-.121 

-.124 

-.127 

-.130 

80 

85 

-.127 

-.129 

-.131 

-.134 

-.137 

-.140 

-.144 

85 

72 


XIX. 


METRICAL    BAROMETER. 


TABLE 

FOR 

REDUCING  TO  THE  FREEZING  POINT  THE  BAROMETRICAL 

COLUMN, 

MEASURED    BY    BRASS     SCALES,     EXTENDING    FROM    THE     CISTERN    TO 

THE    TOP;     CALCULATED    FROM    260    TO    865    MILLIMETRES, 

AND     FOR    EACH     DEGREE     CENTIGRADE. 

BY  M.  T.  DELCROS. 


73 


TABLE  XIX. 


THIS  table  has  been  calculated  by  using  the  following  coefficients  of  dilatation  :  — 
Brass,  linear  dilatation,  from  Laplace  and  Lavoisier  for  100°  C.  =  0.0018782. 
Mercury,  dilatation  in  volume,  from  Dulong  and  Petit  for  100°  C.  =  0.0180180. 
Dilatation  of  the  mercurial  column  for  100°  C.  .  .  .  =  0.0161398. 
Dilatation  of  the  mercurial  column  for  1°  C.  .  .  =  0.0001614. 

Observed  height  reduced  to  freezing  point, 

H=h  —  h  (0.0001614).     T=h  —  h  (JL). 

The  second  term  of  this  last  formula  is  given  by  the  table,  when  the  temperature 
T  and  the  height  h  of  the  barometer  are  known ;  this  correction  must  be  subtracted 
from  the  observed  height  h,  when  the  temperature  is  above  freezing  point ;  it  is  to  be 
added  when  the  temperature  is  below  zero,  or  freezing  point. 

This  table  allows  the  barometrical  heights  taken  at  the  highest  summits,  and  in  the 
deepest  mines,  to  be  corrected. 


Examples  of  Calculation. 


\  mm. 

Barometer,  observed  height, 567.49 

Temperature  of  the  barometer,  -}-120.7. 

o  mm. 

r  for  10.0=0.912 

Second  page,  }  for    2.0  =  0.182 

(  for    0.7  =  0.064 

Total,  =  1.158 
Subtr active  correction,         ...... 

Barometer  at  zero, 


mm. 

Barometer,  observed  height,       .....        454.17 

Temperature  of  the  barometer,  — 7°. 8. 

o          mm. 

for  7.0  =  0.514 


Total,  =  0.573 
Additive  correction,          . 


Barometer  at  zero, 


75 


XIX.   REDUCTION    OF   THE    BAROMETER   TO    THE    FREEZING    POINT. 


Height 
of  the 

TEMPERATURE  CENTIGRADE. 

Barome- 

ter. 

1° 

2° 

3° 

4° 

5° 

6° 

7° 

8° 

9° 

Millira. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

260 

0.042 

0.084 

0.126 

0.168 

0.210 

0.252 

0.294 

0.336 

0.378 

265 

0.043 

0.086 

0.128 

0.171 

0.214 

0.257 

0.299 

0.342 

0.385 

270 

0.044 

0.087 

0.131 

0.174 

0.218 

0.261 

0.305 

0.349 

0.392 

275 

0.044 

0.089 

0.133 

0.178 

0.222 

0.266 

0.311 

0.355 

0.399 

280 

0.045 

0.090 

0.136 

0.181 

0.226 

0.271 

0.316 

0.362 

0.407 

285 

0.046 

0.092 

0.138 

0.184 

0.230 

0.276 

0.322 

0.368 

0.414 

290 

0.047 

0.094 

0.140 

0.187 

0.234 

0.281 

0.328 

0.374 

0.421 

295 

0.048 

0.095 

0.143 

0.190 

0.238 

0.286 

0.333 

0.381 

0.428 

300 

0.048 

0.097 

0.145 

0.194 

0.242 

0.291 

0.339 

0.387 

0.436 

305 

0.049 

0.098 

0.148 

0.197 

0.246 

0.295 

0.345 

0.394 

0.443 

310 

0.050 

0.100 

0.150 

0.200 

0.250 

0.300 

0.350 

0.400 

0.450 

315 

0.051 

0.102 

0.152 

0.203 

0.254 

0-305 

0.356 

0.407 

0.458 

320 

0.052 

0.103 

0.155 

0.207 

0.258 

0.310 

0.361 

0.413 

0.465 

325 

0.052 

0.105 

0.157 

0.210 

0.262 

0.315 

0.367 

0.420 

0.472 

330 

0.053 

0.106 

0.160 

0.213 

0.266 

0.320 

0.374 

0.426 

0.479 

333 

0.054 

0.108 

0.162 

0.216 

0.270 

0.324 

0.379 

0.432 

0.487 

340 

0.055 

0.110 

0.165 

0.219 

0.274 

0.329 

0.384 

0.439 

0.494 

345 

0.056 

0.111 

0.167 

0.223 

0.278 

0.334 

0.390 

0.445 

0.501 

350 

0.056 

0.113 

0.169 

0.226 

0.282 

0.339 

0.395 

0.452 

0.508 

355 

0.057 

0.115 

0.172 

0.229 

0.286 

0.344 

0.401 

0.458 

0.516 

360 

0.058 

0.116 

0.174 

0.232 

0.290 

0.349 

0.407 

0.465 

0.523 

365 

0.059 

0.118 

0.177 

0.236 

0.294 

0.353 

0.412 

0.471 

0.530 

370 

0.060 

0.119 

0.179 

0.239 

0.299 

0.358 

0.418 

0.478 

0.537 

375 

0.060 

0.121 

0.182 

0.242 

0.303 

0.363 

0.424 

0.484 

0.545 

380 

0.061 

0.123 

0.184 

0.245 

0.307 

0.368 

0.429 

0.491 

0.552 

385 

0.062 

0.124 

0.186 

0.249 

0.311 

0.373 

0.435 

0.497 

0.559 

390 

0.063 

0.126 

0.189 

0.252 

0.315 

0.378 

0.441 

0.504 

0.566 

395 

0.064 

0.127 

0.191 

0.255 

0.319 

0.382 

0.446 

0.510 

0.574 

400 

0.065 

0.129 

0.194 

0.258 

0.323 

0.387 

0.452 

0.516 

0.581 

405 

0.065 

0.131 

0.196 

0.261 

0.327 

0.392 

0.457 

0.523 

0.588 

410 

0.066 

0.132 

0.198 

0.265 

0.331 

0.397 

0.463 

0.529 

0.596 

415 

0.067 

0.134 

0.201 

0.268 

0.335 

0.402 

0.469 

0.536 

0.603 

420 

0.068 

0.136 

0.203 

0.271 

0.339 

0.407 

0.474 

0.542 

0.610 

425 

0.068 

0.137 

0.206 

0.274 

0.343 

0.411 

0.480 

0.549 

0.617 

430 

0.069 

0.139 

0.208 

0.278 

0.347 

0.416 

0.486 

0.555 

0.625 

435 

0.070 

0.140 

0.211 

0.281 

0.351 

0.421 

0.491 

0.562 

0.632 

440 

0.071 

0.142 

0.213 

0.284 

0.355 

0.426 

0.497 

0.568 

0.639 

445 

0.072 

0.144 

0.215 

0.287 

0.359 

0.431 

0.503 

0.574 

0.646 

450 

0.073 

0.145 

0.218 

0.290 

0.363 

0.436 

0.508 

0.581 

0.654 

455 

0.073 

0.147 

0.220 

0.294 

0.367 

0.441 

0.514 

0.587 

0.661 

1° 

2° 

3° 

4° 

5° 

6' 

r» 

8° 

9° 

76 


REDUCTION    OF    THE   BAROMETER   TO    THE    FREEZING   POINT. 


Height 
of  the 

TEMPERATURE  CENTIGRADE. 

Barome 

ter. 

1° 

2° 

3° 

40 

5° 

6° 

7° 

8° 

9° 

Millim 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim 

Millim. 

460 

0.0742 

0.1485 

0.2227 

0.2970 

0.371 

0.445 

0.520 

0.594 

0.668 

465 

0.0750 

0.1501 

0.2251 

0.3002 

0.375 

0.450 

0.525 

0.600 

0.675 

470 

0.0759 

0.1517 

0.2276 

0.3034 

0.379 

0.455 

0.531 

0.607 

0.683 

475 

0.0767 

0.1533 

0.2300 

0.3066 

0.383 

0.460 

0.537 

0.613 

0.690 

480 

0.0775 

0.1549 

0.2324 

0.3099 

0.387 

0.465 

0.542 

0.620 

0.697 

485 

0.0783 

0.1565 

0.2348 

0.3131 

0.391 

0.470 

0.548 

0.626 

0.704 

490 

0.0791 

0.1582 

0.2373 

0.3163 

0.395 

0.474 

0.554 

0.633 

0.712 

495 

0.0800 

0.1598 

0.2397 

0.3195 

0.399 

0.479 

0.559 

0.639 

0.719 

500 

0.0807 

0.1614 

0.2421 

0.3228 

0.403 

0.484 

0.565 

0.646 

0.726 

505 

0.0815 

0.1630 

0.2445 

0.3260 

0.407 

0.489 

0.570 

0.652 

0.734 

510 

0.0823 

0.1646 

0.2469 

0.3293 

0.412 

0.494 

0.576 

0.658 

0.741 

515 

0.0831 

0.1662 

0.2493 

0.3325 

0.416 

0.499 

0.582 

0.665 

0.748 

520 

0.0839 

0.1679 

0.2518 

0.3357 

0.420 

0.504 

0.587 

0.671 

0.755 

525 

0.0847 

0.1695 

0.2542 

0.3389 

0.424 

0.508 

0.593 

0.678 

0.763 

530 

0.0855 

0.1711 

0.2566 

0.3422 

0.428 

0.513 

0.599 

0.684 

0.770 

535 

0.0863 

0.1727 

0.2590 

0.3454 

0.432 

0.518 

0.604 

0.691 

0.777 

540 

0.0872 

0.1743 

0.2615 

0.3486 

0.436 

0.523 

0.610 

0.697 

0.784 

545 

0.0879 

0.1759 

0.2639 

0.3518 

0.440 

0.528 

0.616 

0.704 

0.792 

550 

0.0888 

0.1775 

0.2663 

0.3551 

0.444 

0.533 

0.621 

0.710 

0.799 

555 

0.0896 

0.1791 

0.2687 

0.3583 

0.448 

0.537 

0.627 

0.717 

0.806 

560 

0.0904 

0.1808 

0.2712 

0.3615 

0.452 

0.542 

0.633 

0.723 

0.813 

565 

0.0912 

0.1824 

0.2736 

0.3647 

0.456 

0.547 

0.638 

0.730 

0.821 

570 

0.0920 

0.1840 

0.2760 

0.3680 

0.460 

0.552 

0.644 

0.736 

0.828, 

575 

0.0928 

0.1856 

0.2784 

0.3712 

0.464 

0.557 

0.650 

0.742 

0.835 

580 

0.0936 

0.1872 

0.2808 

0.3744 

0.468 

0.562 

0.655 

0.749 

0.842 

585 

0.0944 

0.1888 

0.2833 

0.3777 

0.472 

0.566 

0.661 

0.755 

0.850 

590 

0.0952 

0.1904 

0.2857 

0.3809 

0.476 

0.571 

0.667 

0.762 

0.857 

595 

0.0960 

0.1921 

0.2881 

0.3841 

0.480 

0.576 

0.672 

0.768 

0.864 

600 

0.0968 

0.1937 

0.2905 

0.3874 

0.484 

0.581 

0.678 

0.775 

0.872 

605 

0.0976 

0.1953 

0.2929 

0.3906 

0.488 

0.586 

0.683 

0.781 

0.879 

610 

0.0985 

0.1969 

0.2954 

0.3938 

0.492 

0.591 

0.689 

0.788 

0.886 

615 

0.0993 

0.1985 

0.2978 

0.3970 

0.496 

0.595 

0.695 

0.794 

0.893 

620 

0.1001 

0.2001 

0.3002 

0.4003 

0.500 

0.600 

0.700 

0.800 

0.901 

625 

0.1009 

0.2017 

0.3026 

0.4035 

0.504 

0.605 

0.706 

0.807 

0.908 

630 

0.1017 

0.2034 

0.3050 

0.4067 

0.508 

0.610 

0.712 

0.813 

0.915 

635 

0.1025 

0.2050 

0.3074 

0.4099 

0.512 

0.615 

0.717 

0.820 

0.922 

640 

0.1033 

0.2066 

0.3099 

0.4132 

0.516 

0.620 

0.723 

0.826 

0.930 

645 

0.1041 

0.2082 

0.3123 

0.4164 

0.520 

0.625 

0.729 

0.833 

0.937 

650 

0.1049 

0.2098 

0.3147 

0.4196 

0.524 

0.629 

0.734 

0.839 

0.944 

655 

0.1057 

0.2114 

0.3172 

0.4229 

0.529 

0.634 

0.740 

0.846 

0.951 

660 

0.1065 

0.2130 

0.3196 

0.4261 

0.533 

0.639 

0.746 

0.852 

0.959 

1° 

2° 

3° 

40 

5° 

6° 

7° 

8° 

9° 

c 


77 


REDUCTION    OF    THE   BAROMETER   TO   THE    FREEZING   POINT. 


Height 
of  the 

TEMPERATURE  CENTIGRADE. 

Barome- 

ter. 

1° 

2° 

3° 

40 

5° 

6° 

7° 

8° 

9° 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

665 

0.1073 

0.2146 

0.3220 

0.4293 

0.537 

0.644 

0.751 

0.859 

0.966 

670 

0.1081 

0.2163 

0.3244 

0.4326 

0.541 

0.649 

0.757 

0.865 

0.973 

675 

0.1089 

0.2179 

0.3268 

0.4358 

0.545 

0.654 

0.763 

0.871 

0.980 

680 

0.1097 

0.2195 

0.3292 

0.4390 

0.549 

0.658 

0.768 

0.878 

0.988 

685 

0.1106 

0.2211 

0.3317 

0.4423 

0.553 

0.663 

0.774 

0.884 

0.995 

690 

0.1114 

0.2227 

0.3341 

0.4455 

0.557 

0.668 

0.780 

0.891 

1.002 

695 

0.1122 

0.2233 

0.3365 

0.4487 

0.561 

0.673 

0.785 

0.897 

1.010 

700 

0.1130 

0.2260 

0.3389 

0.4520 

0.565 

0.678 

0.791 

0.904 

1.017 

705 

0.1138 

0.2276 

0.3414 

0.4552 

0.569 

0.683 

0.797 

0.910 

1.024 

710 

0.1146 

0.2292 

0.3438 

0.4584 

0.573 

0.688 

0.802 

0.917 

1.031 

715 

0.1154 

0.2308 

0.3462 

0.4616 

0.577 

0.691 

0.808 

0.923 

1.039 

720 

0.1162 

0.2324 

0.3486 

0.4648 

0.581 

0.697 

0.813 

0.930 

1.046 

725 

0.1170 

0.2340 

0.3510 

0.4680 

0.585 

0.702 

0.819 

0.936 

1.053 

730 

0.1178 

0.2356 

0.3535 

0.4713 

0.589 

0.707 

0.825 

0.943 

1.060 

735 

0.1186 

0.2372 

0.3559 

0.4745 

0.593 

0.712 

0.830 

0.949 

1.068 

740 

0.1104 

0.2389 

0.3583 

0.4777 

0.597 

0.717 

0.836 

0.955 

1.075 

745 

0.1202 

0.2405 

0.3607 

0.4809 

0.601 

0.721 

0.842 

0.962 

1.082 

750 

0.1210 

0.2421 

0.3631 

0.4842 

0.605 

0.726 

0.847  • 

0.968 

1.089 

755 

0.1218 

0.2437 

0.3655 

0.4874 

0.609 

0.731 

0.853 

0.975 

1.097 

760 

0.1227 

0.2453 

0.3680 

0.4906 

0.613 

0.736 

0.859 

0.981 

1.104 

765 

0.1235 

0.2469 

0.3704 

0.4939 

0.617 

0.741 

0.864 

0.988 

1.111 

770 

0.1243 

0.2486 

0.372S 

0.4971 

0.621 

0.746 

0.870 

0.994 

1.118 

775 

0.1251 

0.2502 

0.3752 

0.5003 

0.625 

0.750 

0.876 

1.001 

1.126 

780 

0.1259 

0.2518 

0.3777 

0.5036 

0.629 

0.755 

0.881 

1.007 

1.133 

785 

0.1267 

0.2534 

0.3801 

0.5068 

0.633 

0.760 

0.888 

1.014 

1.140 

790 

0.1275 

0.2550 

0.3825 

0.5100 

0.637 

0.765 

0.893 

.020 

1.148 

795 

0.1283 

0.2566 

0.3849 

0.5132 

0.641 

0.770 

0.898 

.026 

1.155 

800 

0.1291 

0.2582 

0.3874 

0.5165 

0.646 

0.775 

0.904 

.033 

1.162 

805 

0.1299 

0.2598 

0.3898 

0.5197 

0.650 

0.780 

0.909 

.039 

1.169 

810 

0.1307 

0.2615 

0.3922 

0.5230 

0.654 

0.784 

0.915 

.046 

1.177 

815 

0.1315 

0.2621 

0.3946 

0.5262 

0.658 

0.789 

0.921 

.052 

1.184 

820 

0.1323 

0.2647 

0.3970 

0.5294 

0.662 

0.794 

0.926 

.059 

1.191 

825 

0.1331 

0.2653 

0.3994 

0.5326 

0.666 

0.799 

0.932 

.065 

1.198 

830 

0.1340 

0.2679 

0.4019 

0.5358 

0.670 

0.804 

0.938 

.072 

1.206 

835 

0.1348 

0.2695 

0.4043 

0.5391 

0.674 

0.809 

0.943 

.078 

1.213 

840 

0.1356 

0.2712 

0.4067 

0.5423 

0.678 

0.813 

0.949 

.085 

1.220 

845 

0.1364 

0.2728 

0.4091 

0.5455 

0.682 

0.818 

0.955 

.091 

1.227 

850 

0.1372 

0.2744 

0.4116 

0.5488 

0.686 

0.823 

0.960 

.097 

1.235 

855 

0.1380 

0.2760 

0.4140 

0.5520 

0.690 

0.828 

0.966 

.104 

1.242 

860 

0.1388 

0.2776 

0.4164 

0.5552 

0.694 

0.833 

0.972 

.110 

1.249 

865 

0.1396 

0.2792 

0.4188 

0.5584 

0.698 

0.838 

0.977 

1.117 

1.256 

1° 

2° 

3° 

40 

5° 

6° 

7° 

8° 

9° 

c 


78 


XX. 


METRICAL    BAROMETER. 


TABLE 

FOE 

REDUCING  TO  THE  FREEZING-  POINT  THE  BAROMETRICAL 

COLUMN, 

MEASURED    BY     BRASS     SCALES,     EXTENDING     FROM     THE    CISTERN    TO    THE    TOP  ;     CAL- 
CULATED  FOR   THE    HEIGHTS    BETWEEN    605   AND    800    MILLIMETRES,   AND    FOR 
EVERY   TENTH   OF    A   DEGREE,    FROM   0°  TO  + AND  35°  CENTIGRADE. 

BY  M.  T.  HAEGHENS. 


TABLE     XX. 


THIS  table  has  been  calculated  by  using  the  same  coefficients  of  dilatation  as  in  the 
preceding  table,  viz.  :  — 

Brass,  linear  dilatation,  from  Laplace  and  Lavoisier  for  100°  C.=  0.0018782. 

Mercury,  dilatation  in  volume,  from  Dulong  and  Petit  for  100°  C.=  0.0180180. 

Dilatation  of  the  mercurial  column  for  100°  C.   .         .         .         =  0.0161398. 

Dilatation  of  the  mercurial  column  for  1°C.  .         .         =  0.0001614. 

This  table,  calculated  for  the  reduction  of  long  series  of  meteorological  observa- 
tions, gives  immediately  the  value  of  the  correction  for  each  tenth  of  a  degree  up  to 
35°  C.  above,  and  down  to  35°  C.  below,  the  freezing  point,  and  for  mercurial  columns 
extending  from  605  to  800  millimetres. 


Examples  of  Calculation. 

nun* 


Barometer,  observed  height,    .....        754.17 

Temperature  of  the  attached  thermometer,  +17°.8. 

For  finding  the  correction,  seek  in  the  horizontal  column,  headed  barometer,  at  the 
head  of  the  pages,  the  corresponding  height  of  the  barometer;  it  will  be  found,  p.  31, 
barometer  755ram<  (from  752.50  to  757.50)  ;  next  seek  in  the  first  vertical  column, 
containing  the  temperatures,  17°,  follow  then  horizontally  this  line  as  far  as  the  col- 
umn of  8  tenths,  and  you  find  there  2.17  millimetres,  which  is  the  correction,  or  the 
quantity  to  be  subtracted  for  reducing  the  observed  height  to  zero.  We  have  thus  :  — 

mm. 

Observed  height,  .....         754.17 

Subtr  active  correction  for  +17°.8  =  .        .        .       —  2.17 

Barometer  at  zero,  752.00 

If  the  temperature  is  below  zero,  the  correction  will  be  additive. 

nun. 

Observed  height,        ......         729.72 

Temperature  of  the  attached  thermometer,  —  8°.4. 
Additive  correction,  ......        -[~0-99 

Barometer  at  zero,  730.71 


81 


XX.       REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING   POINT. 


BAROMETER:  605mm-  (from  602.51  to  607.50). 

Centi- 
grade 
Degrees. 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.05 

0.06 

0.07 

0.08 

0.09 

1 

0.10 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

2 

0.20 

0.21 

0.21 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

3 

0.29 

0.30 

0.31 

0.32 

0.33 

0.34 

0.35 

0.36 

0.37 

0.38 

4 

0.39 

0.40 

0.41 

0.42 

0.43 

0.44 

0.45 

0.46 

0.47 

0.48 

5 

0.49 

0.50 

0.51 

0.52 

0.53 

0.54 

0.55 

0.56 

0.57 

0.58 

6 

0.59 

0.60 

0.61 

0.62 

0.63 

0.63 

0.64 

0.65 

0.66 

0.67 

7 

0.68 

0.69 

0.70 

0.71 

0.72 

0.73 

0.74 

0.75 

0.76 

0.77 

8 

0.78 

0.79 

0.80 

0.81 

0.82 

0.83 

0.84 

0.85 

0.86 

0.87 

9 

0.88 

0.89 

0.90 

0.91 

0.92 

0.93 

0.94 

0.95 

0.96 

0.97 

10 

0.98 

0.99 

1.00 

1.01 

1.02 

1.03 

1.04 

1.05 

1.05 

1.06 

11 

.07 

1.08 

1.09 

.10 

1.11 

.12 

1.13 

1.14 

1.15 

1.16 

12 

.17 

1.18 

.19 

.20 

1.21 

.22 

1.23 

1.24 

1.25 

1.26 

13 

.27 

1.28 

.29 

.30 

1.31 

.32 

1.33 

1.34 

1.35 

1.36 

14 

.37 

1.38 

.39 

.40 

1.41 

.42 

1.43 

1.44 

1.45 

1.46 

15 

.46 

1.47 

.48 

.49 

1.50 

.51 

1.52 

1.53 

1.54 

1.55 

16 

.56 

1.57 

.58 

1.59 

1.60 

.61 

1.62 

1.63 

1.64 

1.65 

17 

.66 

1.67 

.68 

1.69 

1.70 

.71 

1.72 

1.73 

1.74 

1.75 

18 

.76 

1.77 

.78 

1.79 

1.80 

.81 

1.82 

1.83 

1.84 

1.85 

19 

.86 

1.87 

1.87 

1.88 

1.89 

.90 

1.91 

1.92 

1.93 

1.94 

20 

.95 

1.96 

1.97 

1.98 

1.99 

2.00 

2.01 

2.02 

2.03 

2.04 

21 

2.05 

2.06 

2.07 

2.08 

2.09 

2.10 

2.11 

2.12 

2.13 

2.14 

22 

2.15 

2.16 

2.17 

2.18 

2.19 

2.20 

2.21 

2.22 

2.23 

2.24 

23 

2.25 

2.26 

2.27 

2.28 

2.29 

2.29 

2.30 

2.31 

2.32 

2.33 

24 

2.34 

2.35 

2.36 

2.37 

2.38 

2.39 

2.40 

2.41 

2.42 

2.43 

25 

2.44 

2.45 

2.46 

2.47 

2.48 

2.49 

2.50 

2.51 

2.52 

2.53 

26 

2.54 

2.55 

2.56 

2.57 

2.58 

2.59 

2.60 

2.61 

2.62 

2.63 

27 

2.64 

2.65 

2.66 

2.67 

2.68 

2.69 

2.70 

2.71 

2.71 

2.72 

28 

2.73 

2.74 

2.75 

2.76 

2.77 

2.78 

2.79 

2.80 

2.81 

2.82 

29 

2.83 

2.84 

2.85 

2.86 

2.87 

2.88 

2.89 

2.90 

2.91 

2.92 

30 

2.93 

2.94 

2.95 

2.96 

2.97 

2.98 

2.99 

3.00 

3.01 

3.02 

31 

3.03 

3.04 

3.05 

3.06 

3.07 

3.08 

3.09 

3.10 

3.11 

3.12 

32 

3.12 

3.13 

3.14 

3.15 

3.16 

3.17 

3.18 

3.19 

3.20 

3.21 

33 

3.22 

3.23 

3.24 

3.25 

3.26 

3.27 

3.28 

3.29 

3.30 

3.31 

34 

3.32 

3.33 

3.34 

3.35 

3.36 

3.37 

3.38 

3.39 

3.40 

3.41 

35 

3.42 

3.43 

3.44 

3.45 

3.46 

3.47 

3.48 

3.49 

3.50 

3.51 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

REDUCTION    OF    THE    BAROMETER   TO    THE    FREEZING    POINT. 


2 


.  Centi- 
grade 
Degrees. 

BAROMETER:  610mm-  (from  607.51  to  612.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 
0 

Millim. 
0.00 

Millim. 
0.01 

Millim. 
0.02 

Millim. 
0.03 

Millim. 
0.04 

Millim. 
0.05 

Millim. 
0.06 

Millim. 
0.07 

Millim. 
0.08 

Millim. 
0.09 

1 

0.10 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

2 

0.20 

0.21 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

3 

0.30 

0.31 

0.32 

0.32 

0.33 

0.34 

0.35 

0.36 

0.37 

0.38 

4 

0.39 

0.40 

0.41 

0.42 

0.43 

0.44 

0.45 

0.46 

0.47 

0.48 

5 

0.49 

0.50 

0.51 

0.52 

0.53 

0.54 

0.55 

0.56 

0.57 

0.58 

6 

0.59 

0.60 

0.61 

0.62 

0.63 

0.64 

0.65 

0.66 

0.67 

0.68 

7 

0.69 

0.70 

0.71 

0.72 

0.73 

0.74 

0.75 

0.76 

0.77 

0.78 

8 

0.79 

0.80 

0.81 

0.82 

0.83 

0.84 

0.85 

0.86 

0.87 

0.88 

9 

0.89 

0.90 

0.91 

0.92 

0.93 

0.94 

0.95 

0.96 

0.96 

0.97 

10 

0.98 

0.99 

1.00 

1.01 

1.02 

1.03 

1.04 

1.05 

1.06 

1.07 

11 

.08 

1.09 

1.10 

1.11 

1.12 

1.13 

.14 

1.15 

.16 

1.17 

12 

.18 

1.19 

1.20 

1.21 

1.22 

1.23 

.24 

1.25 

.26 

1.27 

13 

.28 

1.29 

1.30 

.31 

1.32 

1.33 

.34 

1.35 

.36 

1.37 

14 

.38 

1.39 

1.40 

.41 

1.42 

1.43 

.44 

1.45 

.46 

.47 

15 

.48 

1.49 

1.50 

.51 

1.52 

1.53 

.54 

1.55 

.56 

.57 

16 

1.58 

1.59 

1.59 

.60 

1.61 

1.62 

.63 

1.64 

.65 

.66 

17 

1.67 

1.68 

1.69 

.70 

1.71 

1.72 

.73 

1.74 

.75 

.76 

18 

1.77 

1.78 

1.79 

.80 

1.81 

1.82 

.83 

1.84 

1.85 

.86 

19 

1.87 

1.88 

1.89 

.90 

1.91 

1.92 

.93 

1.94 

1.95 

.96 

20 

1.97 

1.98 

1.99 

2.00 

2.01 

2.02 

2.03 

2.04 

2.05 

2.06 

21 

2.07 

2.08 

2.09 

2.10 

2.11 

2.12 

2.13 

2.14 

2.15 

2.16 

22 

2.17 

2.18 

2.19 

2.20 

2.21 

2.22 

2.23 

2.23 

2.24 

2.25 

23 

2.26 

2.27 

2.28 

2.29 

2.30 

2.31 

2.32 

2.33 

2.34 

2.35 

24 

2.36 

2.37 

2.38 

2.39 

2.40 

2.41 

2.42 

2.43 

2.44 

2.45 

25 

2.46 

2.47 

2.48 

2.49 

2.50 

2.51 

2.52 

2.53 

2.54 

2.55 

26 

2.56 

2.57 

2.58 

2.59 

2.60 

2.61 

2.62 

2.63 

2.64 

2.65 

27 

2.66 

2.67 

2.68 

2.69 

2.70 

2.71 

2.72 

2.73 

2.74 

2.75 

28 

2.76 

2.77 

2.78 

2.79 

2.80 

2.81 

2.82 

2.83 

2.84 

2.85 

29 

2.86 

2.86 

2.87 

2.88 

2.89 

2.90 

2.91 

2.92 

2.93 

2.94 

30 

2.95 

2.96 

2.97 

2.98 

2.99 

3.00 

3.01 

3.02 

3.03 

3.04 

31 

3.05 

3.06 

3.07 

3.08 

3.09 

3.10 

3.11 

3.12 

3.13 

3.14 

32 

3.15 

3.16 

3.17 

3.18 

3.19 

3.20 

3.21 

3.22 

3.23 

3.24 

33 

3.25 

3.26 

3.27 

3.28 

3.29 

3.30 

3.31 

3.32 

3.33 

3.34 

34 

3.35 

3.36 

3.37 

3.38 

3.39 

3.40 

3.41 

3.42x 

3.43 

3.44 

35 

3.45 

3.46 

3.47 

3.48 

3.49 

3.50 

3.51 

3.52 

3.53 

3.54 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

83 


REDUCTION    OF   THE   BAROMETER   TO    THE    FREEZING   POINT. 


BAROMETER:  615mm-  (from  612.51  to  617.50). 

Centi- 
grade 
Degrees. 

Tenths  of  Degrees.                                           % 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.05 

0.06 

0.07 

0.08 

0.09 

1 

0.10 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

2 

0.20 

0.21 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

3 

0.30 

0.31 

0.32 

0.33 

0.34 

0.35 

0.36 

0.37 

0.38 

0.39 

4 

0.40 

0.41 

0.42 

0.43 

0.44 

0.45 

0.46 

0.47 

0.48 

0.49 

5 

0.50 

0.51 

0.52 

0.53 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

6 

0.60 

0.61 

0.62 

0.63 

0.64 

0.65 

0.66 

0.67 

0.68 

0.68 

7 

0.69 

0.70 

0.71 

0.72 

0.73 

0.74 

0.75 

0.76 

0.77 

0.78 

8 

0.79 

0.80 

0.81 

0.82 

0.83 

0.84 

0.85 

0.86 

0.87 

0.88 

9 

0.89 

0.90 

0.91 

0.92 

0.93 

0.94 

0.95 

0.96 

0.97 

0.98 

10 

0.99 

1.00 

1.01 

1.02 

1.03 

1.04 

1.05 

1.06 

1.07 

1.08 

11 

1.09 

1.10 

1.11 

1.12 

1.13 

1.14 

1.15 

1.16 

.17 

1.18 

12 

1.19 

1.20 

1.21 

1.22 

1.23 

1.24 

1.25 

1.26 

.27 

1.28 

13 

1.29 

1.30 

1.31 

1.32  , 

1.33 

1.34 

1.35 

.36 

.37 

.38 

14 

1.39 

1.40 

1.41 

1.42 

1.43 

1.44 

1.45 

.46 

.47 

.48 

15 

1.49 

1.50 

1.51 

1.52 

1.53 

1.54 

1.55 

.56 

.57 

.58 

16 

1.59 

1.60 

1.61 

1.62 

1.63 

1.64 

1.65 

.66 

1.67 

.68 

17 

1.69 

1.70 

1.71 

1.72 

l;73 

1.74 

1.75 

.76 

1.77 

.78 

18 

1.79 

1.80 

1.81 

1.82 

1.83 

1.84 

1.85 

1.86 

1.87 

.88 

19 

1.89 

1.90 

1.91 

1.92 

1.93 

1.94 

1.95 

1.96 

1.97 

1.98 

20 

1.99 

2.00 

2.01 

2.01 

2.02 

2.03 

2.04 

2.05 

2.06 

2.07 

21 

2.08 

2.09 

2.10 

2.11 

2.12 

2.13 

2.14 

2.15 

2.16 

2.17 

22 

2.18 

2.19 

2.20 

2.21 

2.22 

2.23 

2.24 

2.25 

2.26 

2.27 

23 

2.28 

2.29 

2.30 

2.31 

2.32 

2.33 

2.34 

2.35 

2.36 

2.37 

24 

2.38 

2.39 

2.40 

2.41 

2.42 

2.43 

2.44 

2.45 

2.46 

2.47 

25 

2.48 

2.49 

2.50 

2.51 

2.52 

2.53 

2.54 

2.55 

2.56 

2.57 

26 

2.58 

2.59 

2.60 

2.61 

2.62 

2.63 

2.64 

2.65 

2.66 

2.67 

27 

2.68 

2.69 

2.70 

2.71 

2.72 

2.73 

2.74 

2.75 

2.76 

2.77 

28 

2.78 

2.79 

2.80 

2.81 

2.82 

2.83 

2.84 

2.85 

2.86 

2.87 

29 

2.88 

2.89 

2.90 

2.91 

2.92 

2.93 

2.94 

2.95 

2.96 

2.97 

30 

2.98 

2.99 

3.00 

3.01 

3.02 

3.03 

3.04 

3.05 

3.06 

3.07 

31 

3.08 

3.09 

3.10 

3.11 

3.12 

3.13 

3.14 

3.15 

3.16 

3.17 

32 

3.18 

3.19 

3.20 

3.21 

3.22 

3.23 

3.24 

3.25 

3.26 

3.27 

33 

3.28 

3.29 

3.30 

3.31 

3.32 

3.33 

3.34 

3.35 

3.36 

3.36 

34 

3.37 

3.38 

3.39 

3.40 

3.41 

3.42 

3.43 

3.44 

3.45 

3.46 

35 

3.47 

3.48 

3.49 

3.50 

3.51 

3.52 

3.53 

3.54 

3.55 

3.56 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

84 


REDUCTION    OF   THE   BAROMETER   TO    THE    FREEZING   POINT. 


Centi- 
grade 
Degrees. 

BAROMETER:  620ram-  (from  617.51  to  622.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

». 

9. 

o 
0 

Millim. 
0.00 

Millim. 
0.01 

Millim. 
0.02 

Millim. 
0.03 

Millim. 
0.04 

Millim. 
0.05 

Millim. 
0.06 

Millim. 
0.07 

Millim 
0.08 

Millim. 
0.09 

1 

0.10 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

2 

0.20 

0.21 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

3 

0.30 

0.31 

0.32 

0.33 

0.34 

0.35 

0.36 

0.37 

0.38 

0.39 

4 

0.40 

0.41 

0.42 

0.43 

0.44 

0.45 

0.46 

0.47 

0.48 

0.49 

5 

0.50 

0.51 

0.52 

0.53 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

6 

0.60 

0.61 

0.62 

0.63 

0.64 

0.65 

0.66 

0.67 

0.68 

0.69 

7 

0.70 

0.71 

0.72 

0.73 

0.74 

0.75 

0.76 

0.77 

0.78 

0.79 

8 

0.80 

0.81 

0.82 

0.83 

0.84 

0.85 

0.86 

0.87 

0.88 

0.89 

9 

0.90 

0.91 

0.92 

0.93 

0.94 

0.95 

0.96 

0.97 

0.98 

0.99 

10 

1.00 

1.01 

1.02 

1.03 

1.04 

1.05 

1.06 

1.07 

1.08 

1.09 

11 

1.10 

.11 

1.12 

.13 

1.14 

1.15 

1.16 

1.17 

1.18 

1.19 

12 

1.20 

.21 

1.22 

.23 

1.24 

1.25 

1.26 

1.27 

1.28 

1.29 

13 

.30 

.31 

1.32 

.33 

1.34 

1.35 

1.36 

1.37 

1.38 

1.39 

14 

.40 

.41 

.42 

.43 

1.44 

1.45 

1.46 

1.47 

1.48 

1.49 

15 

.50 

.51 

.52 

.53 

1.54 

1.55 

1.56 

1.57 

1.58 

1.59 

16 

.60 

1.61 

.62 

1.63 

1.64 

1.65 

1.66 

1.67 

1.68 

1.69 

17 

.70 

1.71 

.72 

1.73 

1.74 

1.75 

1.76 

1.77 

1.78 

1.79 

18 

.80 

1.81 

.82 

1.83 

1.84 

1.85 

1.86 

1.87 

1.88 

1.89 

19 

.90 

1.91 

.92 

1.93 

1.94 

1.95 

1.96 

1.97 

1.98 

1.99 

20 

2.00 

2.01 

2.02 

2.03 

2.04 

2.05 

2.06 

2.07 

2.08 

2.09 

21 

2.10 

2.11 

2.12 

2.13 

2.14 

2.15 

2.16 

2.17 

2.18 

2.19 

22 

2.20 

2.21 

2.22 

2.23 

2.24 

2.25 

2.26 

2.27 

2.28 

2.29 

23 

2.30 

2.31 

2.32 

2.33 

2.34 

2.35 

2.36 

2.37 

2.38 

2.39 

24 

2.40 

2.41 

2.42 

2.43 

2.44 

2.45 

2.46 

2.47 

2.48 

2.49 

25 

2.50 

2.51 

2.52 

2.53 

2.54 

2.55 

2.56 

2.57 

2.58 

2.59 

26 

2.60 

2.61 

2.62 

2.63 

2.64 

2.65 

2.66 

2.67 

2.68 

2.69 

27 

2.70 

2.71 

2.72 

2.73 

2.74 

2.75 

2.76 

2.77 

2.78 

2.79 

28 

2.80 

2.81 

2.82 

2.83 

2.84 

2.85 

2.86 

2.87 

2.88 

2.89 

29 

2.90 

2.91 

2.92 

2.93 

2.94 

2.95 

2.96 

2.97 

2.98 

2.99 

30 

3.00 

3.01 

3.02 

3.03 

3.04 

3.05 

3.06 

3.07 

3.08 

3.09 

31 

3.10 

3.11 

3.12 

3.13 

3.14 

3.15 

3.16 

3.17 

3.18 

3.19 

32 

3.20 

3.21 

3.22 

3.23 

3.24 

3.25 

3.26 

3.27 

3.28 

3.29 

33 

3.30 

3.31 

3.32 

3.33 

3.34 

3.35 

3.36 

3.37 

3.38 

3.39 

34 

3.40 

3.41 

3.42 

3.43 

3.44 

3.45 

3.46 

3.47 

3.48 

3.49 

35 

3.50 

3.51 

3.52 

3.53 

3.54 

3.55 

3.56 

3.57 

3.58 

3.59 

0. 

1. 

2. 

3. 

4. 

5. 

C. 

7. 

S. 

9. 

85 


REDUCTION    OF   THE    BAROMETER   TO    THE    FREEZING   POINT. 


Centi- 
grade 
Degrees. 

BAROMETER:  625mra-  (from  622.51  to  627.50) 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

K 

.9* 

o 
0 

Millim. 
0.00 

Millim. 
0.01 

Millim. 
0.02 

Millim.  ' 
0.03 

Millim. 
0.04 

Millim. 
0.05 

Millim. 
0.06 

Millim. 
0.07 

Millim 
0.08 

Millim. 
0.09 

1 

0.10 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

2 
3 

0.20 
0.30 

0.21 
0.31 

0.22 
0.32 

0.23 
0.33 

0.24 
0.34 

0.25 
0.35 

0.26 
0.36 

0.27 
0.37 

0.28 
0.38 

0.29 
0.39 

4 

0.40 

0.41 

0.42 

0.43 

0.44 

0.45 

0.46 

0.47 

0.48 

0.49 

5 

0.50 

0.31 

0.52 

0.53 

0.54 

0.55 

0.56 

0.58 

0.59 

0.60 

6 

0.61 

0.62 

0.63 

0.64 

0.65 

0.66 

0.67 

0.68 

0.69 

0.70 

7 

0.71 

0.72 

0.73 

0.74 

0.75 

0.76 

0.77 

0.78 

0.79 

0.80 

8 

0.81 

0.82 

0.83 

0.84 

0.85 

0.86 

0.87 

0.88 

0.89 

0.90 

9 

0.91 

0.92 

0.93 

0.94 

0.95 

0.96 

0.97 

0.98 

0.99 

1.00 

10 

1.01 

1.02 

1.03 

1.04 

1.05 

1.06 

1.07 

1.08 

1.09 

1.10 

11 

1.11 

1.12 

1.13 

1.14 

.15 

.16 

1.17 

1.18 

.19 

1.20 

12 

1.21 

1.22 

1.23 

1.24 

.25 

.26 

1.27 

1.28 

.29 

1.30 

13 

1.31 

1.32 

1.33 

1.34 

.35 

.36 

1.37 

1.38 

.39 

1.40    , 

14 

1.41 

1.42 

.43 

1.44 

.45 

.46 

1.47 

1.48 

.49 

1.50 

15 

1.51 

1.52 

.  .53 

1.54 

.55 

.56 

1.57 

1.58 

.59 

1.60 

16 

1.61 

1.62 

.63 

1.64 

.65 

.66 

1.67 

1.68 

.69 

1.70 

17 

1.71 

1.73 

.74 

1.75 

.76 

.77 

1.78 

1.79 

.80 

1.81 

18 

1.82 

1.83 

.84 

1.85 

1.86 

.87 

1.88 

1.89 

1.90 

1.91 

19 

1.92 

1.93 

.94 

1.95 

1.96 

.97 

1.98 

1.99 

2.00 

2.01 

20 

2.02 

2.03 

2.04 

2.05 

2.06 

2.07 

2.08 

2.09 

2.10 

2.11 

21 

2.12 

2.13 

2.14 

2.15 

2.16 

2.17 

2.18 

2.19 

2.20 

2.21 

22 

2.22 

2.23 

2.24 

2.25 

2.26 

2.27 

2.28 

2.29 

2.30 

2.31 

23 

2.32 

2.33 

2.34 

2.35 

2.36 

2.37 

2.38 

2.39 

2.40 

2.41 

24 
25 

2.42 
2.52 

2.43 
2.53 

2.44 
2.54 

2.45 
2.55 

2.46 
2.56 

2.47 
2.57 

2.48 

2.58 

2.49 
2.59 

2.50 
2.60 

2.51 
2.61 

26 

2.62 

2.63 

2.64 

2.65 

2.66 

2.67 

2.68 

2.69 

2.70 

2.71 

27 

2.72 

2.73 

2.74 

2.75 

2.76 

2.77 

2.78 

2.79 

2.80 

2.81 

28 

2.82 

2.83 

2.84 

2.85 

2.87 

2.88 

2.89 

2.90 

2.91 

2.92 

29 

2.93 

2.94 

2.95 

2.96 

2.97 

2.98 

2.99 

3.00 

3.01 

3.02 

30 

3.03 

3.04 

3.05 

3.06 

3.07 

3.08 

3.09 

3.10 

3.11 

3.12 

31 

3.13 

3.14 

3.15 

3.16 

3.17 

3.18 

3.19 

3.20 

3.21 

3.22 

32 

3.23 

3.24 

3.25 

3.26 

3.27 

3.28 

3.29 

3.30 

3.31 

3.32 

33 

3.33 

3.34 

3.35 

3.36 

3.37 

3.38 

3.39 

3.40 

3.41 

3.42 

34 

3.43 

3.44 

3.45 

3.46 

3.47 

3.48 

3.49 

3.50 

3.51 

3.52 

35 

3.53 

3.54 

3.55 

3.56 

3.57 

3.58 

3.59 

3.60 

3.61 

3.62 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

§. 

9. 

c 


86 


REDUCTION  OF  THE  BAROMETER  TO  THE  FREEZING  POINT. 


BAROMETER:  630mm-  (from  627.51  to  632.50). 

Centi- 
grade 

Tenths  of  Degrees. 

Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

S. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.05 

0.06 

0.07 

0.08 

0.09 

1 

0.10 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

2 

0.20 

0.21 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

3 

0.31 

0.32 

0.33 

0.34 

0.35 

0.36 

0.37 

0.38 

0.39 

0.40 

4 

0.41 

0.42 

0.43 

0.44 

0.45 

0.46 

0.47 

0.48 

0.49 

0.50 

5 

0.51 

0.52 

0.53 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

0.60 

6 

0.61 

0.62 

0.63 

0.64 

0.65 

0.66 

0.67 

0.68 

0.69 

0.70 

7 

0.71 

0.72 

0.73 

0.74 

0.75 

0.76 

0.77 

0.78 

0.79 

0.80 

8 

0.81 

0.82 

0.83 

0.84 

0.85 

0.86 

0.87 

0.88 

0.89 

0.90 

9 

0.92 

0.93 

0.94 

0.95 

0.96 

0.97 

0.98 

0.99 

1.00 

1.01 

10 

1.02 

1.03 

1.04 

1.05 

1.06 

1.07 

1.08 

1.09 

1.10 

1.11 

11 

.12 

1.13 

.14 

1.15 

.16 

1.17 

.18 

1.19 

1.20 

1.21 

12 

.22 

1.23 

.24 

1.25 

.26 

1.27 

.28 

1.29 

1.30 

1.31 

13 

.32 

1.33 

.34 

1.35 

.36 

1.37 

.38 

1.89 

1.40 

1.41 

14 

.42 

1.43 

.44 

1.45 

.46 

1.47 

.48 

1.49 

1.50 

1.52 

15 

.53 

1.54 

.55 

1.56. 

.57 

1.58 

.59 

1.60 

1.61 

1.62 

16 

.63 

1.64 

.65 

1.66 

.67 

1.68 

1.69 

1.70 

1.71 

1.72 

17 

.73 

1.74 

.75 

1.76 

.77 

1.78 

1.79 

1.80 

1.81 

1.82 

18 

1.83 

1.84 

.85 

1.86 

1.87 

1.88 

1.89 

1.90 

1.91 

1.92 

19 

1.93 

1.94 

.95 

1.96 

1.97 

1.98 

1.99 

2.00 

2.01 

2.02 

20 

2.03 

2.04 

2.05 

2.06 

2.07 

2.08 

2.09 

2.10 

2.11 

2.13 

21 

2.14 

2.15 

2.16 

2.17 

2.18 

2.19 

2.20 

2.21 

2.22 

2.23 

22 

2.24 

2.25 

2.26 

2.27 

2.28 

2.29 

2.30 

2.31 

2.32 

2.33 

23 

2.34 

2.35 

2.36 

2.37 

2.38 

2.39 

2.40 

2.41 

2.42 

2.43 

24 

2.44 

2.45 

2.46 

2.47 

2.48 

2.49 

2.50 

2.51 

2.52 

2.53 

25 

2.54 

2.55 

2.56 

2.57 

2.58 

2.59 

2.60 

2.61 

2.62 

2.63 

26 

2.64 

2.65 

2.66 

2.67 

2.68 

2.69 

2.70 

2.71 

2.73 

2.74 

27 

2.75 

2.76 

2.77 

2.78 

2.79 

2.80 

2.81 

2.82 

2.83 

2.84 

28 

2.85 

2.86 

2.87 

2.88 

2.89 

2.90 

2.91 

2.92 

2.93 

2.94 

29 

2.95 

2.96 

2.97 

2.98 

2.99 

3.00 

3.01 

3.02 

3.03 

3.04 

30 

3.05 

3.06 

3.07 

3.08 

3.09 

3.10 

3.11 

3.12 

3.13 

3.14 

31 

3.15 

3.16 

3.17 

3.18 

3.19 

3.20 

3.21 

3.22 

3.23 

3.24 

32 

3.25 

3.26 

3.27 

3.28 

3.29 

3.30 

3.31 

3.32 

3.34 

3.35 

33 

3.36 

3.37 

3.38 

3.39 

3.40 

3.41 

3.42 

3.43 

3.44 

3.45 

34 

3.46 

3.47 

3.48 

3.49 

3.50 

3.51 

3.52 

3.53 

3.54 

3.55 

35 

3.56 

3.57 

3.58 

3.59 

3.60 

3.61 

3.62 

3.63 

3.64 

3.65 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

C                                                             87 

REDUCTION    OF    THE    BAROMETER   TO    THE    FREEZING   POINT. 


BAROMETER:  635rom-  (from  632.51  to  637.50), 

Centi- 
grade 
Degrees. 

Tenths  of  Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

». 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.05 

0.06 

0.07 

0.08 

0.09 

1 

0.10 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

2 

0.20 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

0.30 

3 

0.31 

0.32 

0.33 

0.34 

0.35 

0.36 

0.37 

0.38 

0.39 

0.40 

4 

0.41 

0.42 

0.43 

0.44 

0.45 

0.46 

0.47 

0.48 

0.49 

0.50 

5 

0.51 

0.52 

0.53 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

0.60 

6 

0.61 

0.63 

0.64 

0.65 

0.66 

0.67 

0.68 

0.69 

0.70 

0.71 

7 

0.72 

0.73 

0.74 

0.75 

0.76 

0.77 

0.78 

0.79 

0.80 

0.81 

8 

0.82 

0.83 

0.84 

0.85 

0.86 

0.87 

0.88 

0.89 

0.90 

0.91 

9 

0.92 

0.93 

0.94 

0.95 

0.96 

0.97 

0.98 

0.99 

1.00 

1.01 

10 

1.02 

1.04 

1.05 

1.06 

1.07 

1.08 

1.09 

1.10 

1.11 

1.12 

11 

1.13 

.14 

1.15 

1.16 

1.17 

.18 

1.19 

1.20 

1.21 

1.22 

12 

1.23 

.24 

1.25 

1.26 

1.27 

.28 

1.29 

1.30 

1.31 

1.32 

13 

1.33 

,34 

1.35 

1.36 

.37 

.38 

1.39 

1.40 

1.41 

1.42 

14 

1.43 

.45 

1.46 

1.47 

.48 

.49 

1.50 

1.51 

1.52 

1.53 

15 

1.54 

.55 

1.56 

1.57 

.58 

.59 

1.60 

1.61 

1.62 

1.63 

16 

1.64 

.65 

1.66 

1.67 

.68 

.69 

1.70 

1.71 

1.72 

1.73 

17 

1.74 

.75 

1.76 

1.77 

.78 

.79 

1.80 

1.81 

1.82 

1.83 

18 

1,84 

.86 

1.87 

1.88 

.89 

1.90 

1.91 

1.92 

1.93 

1.94 

19 

1.95 

.96 

1.97 

1.98 

.99 

2.00 

2.01 

2.02 

2.03 

2.04 

20 

2,05 

2.06 

2.07 

2.08 

2.09 

2.10 

2.11 

2.12 

2.13 

2.14 

21 

2,15 

2.16 

2.17 

2.18 

2.19 

2.20 

2.21 

2.22 

2.23 

2.24 

22 

2.25 

2.27 

2.28 

2.29 

2.30 

2.31 

2.32 

2.33 

2.34 

2.35 

23 

2.36 

2.37 

2.38 

2.39 

2.40 

2.41 

2.42 

2.43 

2.44 

2.45 

24 

2.46 

2.47 

2.48 

2.49 

2.50 

2.51 

2.52 

2.53 

2.54 

2.55 

25 

2.56 

2.57 

2.58 

2.59 

2.60 

2.61 

2.62 

2.63 

2.64 

2.65 

26 

2.66 

2.67 

2.69 

2.70 

2.71 

2.72 

2.73 

2.74 

2.75 

2.76 

27 

2.77 

2.78 

2.79 

2.80 

2.81 

2.82 

2.83 

2.84 

2.85 

2.86 

28 

2.87 

2.88 

2.89 

2.90 

2.91 

2.92 

2.93 

2.94 

2.95 

2.96 

29 

2.97 

2.98 

2.99 

3.00 

3.01 

3.02 

3.03 

3.04 

3.05 

3.06 

30 

3,07 

3.08 

3.10 

3.11 

3.12 

3.13 

3.14 

3.15 

3.16 

3.17 

31 

3.18 

3.19 

3.20 

3.21 

3.22 

3.23 

3.24 

3.25 

3.26 

3.27 

32 

3.28 

3.29 

3.30 

3.31 

3.32 

3.33 

3.34 

3.35 

3.36 

3.37 

33 

3.38 

3.39 

3.40 

3.41 

3.42 

3.43 

3.44 

3.45 

3.46 

3.47 

34 

3.48 

3.49 

3.51 

3.52 

3.53 

3.54 

3.55 

3.56 

3.57 

3.58 

35 

3.59 

3.60 

3.61 

3.62 

3.63 

3.64 

3.65 

3.66 

3.67 

3.68 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

0. 

88 


REDUCTION  OF  THE  BAROMETER  TO  THE  FREEZING  POINT. 


Centi- 
grade 
Degrees. 

BAROMETER:  640mm  (from  637.51  to  642.50). 

Tenths  of  Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

Millim. 
0.07 

». 

9. 

o 
0 

M  Him. 
0.00 

Millim. 
0.01 

Millim. 
0.02 

Millim. 
0.03 

Millim. 
0.04 

Millim. 
0.05 

Millim. 
0.06 

Millim. 
0.08 

Millim. 
0.09 

1 

0.10 

0.11 

0.12 

0.13 

0.14 

0.15 

0.17 

0.18 

0.19 

0.20 

2 

0.21 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

0.30 

3 

0.31 

0.32 

0.33 

0.34 

0.35 

0.36 

0.37 

0.38 

0.39 

0.40 

4 

0.41 

0.42 

0.43 

0.44 

0.45 

0.46 

0.48 

0.49 

0.50 

0.51 

5 

0.52 

0.53 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

0.60 

0.61 

6 

0.62 

0.63 

0.64 

0.65 

0.66 

0.67 

0.68 

0.69 

0.70 

0.71 

7 

0.72 

0.73 

0.74 

0.75 

0.76 

0.77 

0.78 

0.80 

0.81 

0.82 

8 

0.83 

0.84 

0.85 

0.86 

0.87 

0.88 

0.89 

0.90 

0.91 

0.92 

9 

0.93 

0.94 

0.95 

0.96 

0.97 

0.98 

0.99 

1.00 

1.01 

.02 

10 

1.03 

1.04 

1.05 

1.06 

1.07 

1.08 

1.09 

1.11 

1.12 

.13 

11 

1.14 

.15 

.16 

.17 

1.18 

.19 

.20 

1.21 

1.22 

.23 

12 

1.24 

.25 

.26 

.27 

•   1.28 

.29 

.30 

1.31 

1.32 

.33 

13 

1.34 

.35 

.36 

.37 

1.38 

.39 

.40 

1.42 

.43 

.44 

14 

.45 

.46 

.47 

.48 

1.49 

.50 

.51 

1.52 

.53 

.54 

15 

.55 

.56 

.57 

.58 

1.59 

.60 

.61 

1.62 

.63 

1.64 

16 

.65 

.66 

.67 

.68 

1.69 

1.70 

.71 

1.72 

.74 

1.75 

17 

.76 

.77 

.78 

.79 

1.80 

1.81 

.82 

1.83 

.84 

1.85 

18 

.86 

1.87 

.88 

.89 

1.90 

1.91 

.92 

1.93 

.94 

1.95 

19 

.96 

1.97 

.98 

.99 

2.00 

2.01 

2.02 

2.03 

2.05 

2.06 

20 

2.07 

2.08 

2.09 

2.10 

2.11 

2.12 

2.13 

2.14 

2.15 

2.16 

21 

2.17 

2.18 

2.19 

2.20 

2.21 

2.22 

2.23 

2.24 

2.25 

2.26 

22 

2.27 

2.28 

2.29 

2.30 

2.31 

2.32 

2.33 

2.34 

2.36 

2.37 

23 

2.33 

2.39   • 

2.40 

2.41 

2.42 

2.43 

2.44 

2.45 

2.46 

2.47 

24 

2.48 

2.49 

2.50 

2.51 

2.52 

2.53 

2.54 

2.55 

2.56 

2.57 

25 

2.58 

2.59 

2.60 

2.61 

2.62 

2.63 

2.64 

2.65 

2.66 

2.68 

26 

2.69 

2.70 

2.71 

2.72 

2.73 

2.74 

2.75 

2.76 

2.77 

2.78 

27 

2.79 

2.80 

2.81 

2.82 

2.83 

2.84 

2.85 

2.86 

2.87 

2.88 

28 

2.89 

2.90 

2.91 

2.92 

2.93 

2.94 

2.95 

2.96 

2.97 

2.99 

29 

3.00 

3.01 

3.02 

3.03 

3.04 

3.05 

3.06 

3.07 

3.08 

3.09 

30 

3.10 

3.11 

3.12 

3.13 

3.14 

3.15 

3.16 

3.17 

3.18 

3.19 

31 

3.20 

3.21 

3.22 

3.23 

3.24 

3.25 

3.26 

3.27 

3.28 

3.30 

32 

3.31 

3.32 

3.33 

3.34 

3.35 

3.36 

3.37 

3.38 

3.39 

3.40 

33 

3.41 

3.42 

3.43 

3.44 

3.45 

3.46 

3.47 

3.48 

3.49 

3.50 

34 

3.51 

3.52 

3.53 

3.54 

3.55 

3.56 

3.57 

3.58 

3.59 

3.60 

35 

3.62 

3.63 

3.64 

-  3.65 

3.66 

3.67 

3.68 

3.69 

3.70 

3.71 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

89 


9 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


BAROMETER  :  645ram-  (from  642.51  to  647.50). 

Centi- 
grade 
Degrees. 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

». 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.05 

0.06 

0.07 

0.08 

0.09 

1 

0.10 

0.11 

0.12 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

0.20 

2 

0.21 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

0.30 

3 

0.31 

0.32 

0.33 

0.34 

0.35 

0.36 

0.37 

0.39 

0.40 

0.41 

4 

0.42 

0.43 

0.44 

0.45 

0.46 

0.47 

0.48 

0.49 

0.50 

0.51 

5 

0.52 

0.53 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

0.60 

0.61 

6 

0.62 

0.64 

0.65 

0.66 

0.67 

0.68 

0.69 

0.70 

0.71 

0.72 

7 

0.73 

0.74 

0.75 

0.76 

0.77 

0.78 

0.79 

0.80 

0.81 

0.82 

8 

0.83 

0.84 

0.85 

0.86 

0.87 

0.88 

0.90 

0.91 

0.92 

0.93 

9 

0.94 

0.95 

0.96 

0.97 

0.98 

0.99 

1.00 

1.01 

1.02 

1.03 

10 

1.04 

1.05 

1.06 

1.07 

1.08 

1.09 

1.10 

1.11 

1.12 

1.13 

11 

.15 

.16 

1.17 

.18 

.19 

.20 

1.21 

1.22 

1.23 

1.24 

12 

.25 

.26 

1.27 

.28 

.29 

.30 

1.31 

1.32 

1.33 

1.34 

13 

.35 

.36 

1.37 

.38 

.39 

.41 

1.42 

1.43 

1.44 

1.45 

14 

.46 

.47 

1.48 

.49 

.50 

.51 

1.52 

1.53 

1.54 

1.55 

15 

.56 

.57 

1.58 

.59 

.60 

.61 

1.62 

1.63 

1.64 

1.66 

16 

.67 

.68 

1.69 

.70 

.71 

1.72 

1.73 

1.74 

1.75 

1.76 

17 

.77 

.78 

1.79 

.80 

.81 

1.82 

1.83 

1.84 

1.85 

1.86 

18 

.87 

1.88 

1.89 

.91 

.92 

1.93 

1.94 

1.95 

1.96 

1.97 

19 

.98 

1.99 

2.00 

2.01 

2.02 

2.03 

2.04 

2.05 

2.06 

2.07 

20 

2.08 

2.09 

2.10 

2.11 

2.12 

2.13 

2.14 

2.15 

2.17 

2.18 

21 

2.19 

2.20 

2.21 

2.22 

2.23 

2.24 

2.25 

2.26 

2.27 

2.28 

22 

2.29 

2.30 

2.31 

2.32 

2.33 

2.34 

2.35 

2.36 

2.37 

2.38 

23 

2.39 

2.40 

2.42 

2.43 

2.44 

2.45 

2.46 

2.47 

2.48 

2.49 

24 

2.50 

2.51 

2.52 

2.53 

2.54 

2.55 

2.56 

2.57 

2.58 

2.59 

25 

2.60 

2.61 

2.62 

2.63 

2.64 

2.65 

2.66 

2.67 

2.69 

2.70 

26 

2.71 

2.72 

2.73 

2.74 

2.75 

2.76 

2.77 

2.78 

2.79 

2.80 

27     |[    2.81 

2.82 

2.83 

2.84 

2.85 

2.86 

2.87 

2.88 

2.89 

2.90 

2? 

:;.9* 

2.93 

2.94 

2.95 

2.96 

2.97 

2.98 

2.99 

3.00 

3.01 

29 

3.02 

3.03 

3.04 

3.05 

3.06 

3.07 

3.08 

3.09 

3.10 

3.11 

30 

3.12 

3.13 

3.14 

3.15 

3.16 

3.18 

3.19 

3.20 

3.21 

3.22 

31 

3.23 

3.24 

3.25' 

3.26 

3.27 

3.28 

3.29 

3.30 

3.31 

3.32 

32 

3.33  s 

3.34 

3.35 

3.36 

3.37 

3.38 

3.39 

3.40 

3.41 

3.42 

33 

3.44" 

3.45 

3.46 

3.47 

3.48 

3.49 

3.50 

3.51 

3.52 

3.53 

34 

3.54 

3.55 

3.56 

3.57 

3.58 

3.59 

3.60 

3.61 

3.62 

3.63 

35 

3.64 

3.65 

3.66 

3.67 

3.68 

3.69 

3.70 

3.71 

3.72 

3.73 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

90 


REDUCTION    OF    THE    BAROMETER   TO    THE    FREEZING   POINT. 


10 


BAROMETER  :  650mm-  (from  647.51  to  652.50). 

Centi- 
grade 

Tenths  of  Degrees. 

Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.05 

0.06 

0.07 

0.08 

0.09 

1 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

0.20 

2 

0.21 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

0.30 

3 

0.32 

0.33 

0.34 

0.35 

0.36 

0.37 

0.38 

0.39 

0.40 

0.41 

4 

0.42 

0.43 

0.44 

0.45 

0.46 

0.47 

0.48 

0.49 

0.50 

0.51 

5 

0.53 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

0.60 

0.61 

0.62 

6 

0.63   ' 

0.64 

0.65 

0.66 

0.67 

0.68 

0.69 

0.70 

0.71 

0.72 

7 

0.73 

0.75 

0.76 

0.77 

0.78 

0.79 

0.80 

0.81 

0.82 

0.83 

8 

0.84 

0.85 

0.86 

0.87 

0.88 

0.89 

0.90 

0.91 

0.92 

0.93 

9 

0.94 

0.96 

0.97 

0.98 

0.99 

1.00 

1.01 

.02 

1.03 

1.04 

10 

1.05 

1.06 

1.07 

1.08 

1.09 

1.10 

1.11 

.12 

1.13 

1.14 

11 

1.15 

1.17 

1.18 

1.19 

1.20 

1.21 

1.22 

.23 

1.24 

1.25 

12 

1.26 

1.27 

1.28 

1.29 

1.30 

1.31 

1.32 

.33 

1.34 

1.35 

13 

1.36 

1.37 

1.39 

1.40 

1.41 

1.42 

1.43 

.44 

1.45 

1.46 

14 

1,47 

1.48 

1.49 

1.50 

1.51 

1.52 

1.53 

.54 

1.55 

1.56 

15 

1.57 

1.58 

1.60 

1.61 

1.62 

1.63 

1.64 

.65 

1.66 

1.67 

16 

1.68 

1.69 

1.70 

1.71 

1.72 

1.73 

1.74 

1.75 

1.76 

1.77 

17 

1.78 

1.79 

1.81 

1.82 

1.83 

1.84 

1.85 

1.86 

1.87 

1.88 

18 

1.89 

1.90 

1.91 

1.92 

1.93 

1.94 

1.95 

1.96 

1.97 

1.98 

19 

1.99 

2.00 

2.01 

2.03 

2.04 

2.05 

2.06 

2.07 

2.08 

2.09 

20 

2.10 

2.11 

2.12 

2.13 

2.14 

2.15 

2.16 

2.17 

2.18 

2.19 

21 

2.20 

2.21 

2.22 

2.24 

2.25 

2.26 

2.27 

2.28 

2.29 

2.30 

22 

2.31 

2.32 

2.33 

2.34 

2.35 

2.36 

2.37 

2.38 

2.39 

2.40 

23 

2.41 

2.42 

2.43 

2.44 

2.46 

2.47 

2.48 

2.49 

2.50 

2.51 

24 

2.52 

2.53 

2.54 

2.55 

2.56 

2.57 

2.58 

2.59 

2.60 

2.61 

25 

2.62 

2.63 

2.64 

2.65 

2.67 

2.68 

2.69 

2.70 

2.71 

2.72 

26 

2.73 

2.84 

2.75 

2.76 

2.77 

2.78 

2.79 

2.80 

2.81 

2.82 

27 

2.83 

2.84 

2.85 

2.86 

2.88 

2.89 

2.90 

2.91 

2.92 

2.93 

28 

2.94 

2.95 

2.96 

2.97 

2.98 

2.99 

3.00 

3.01 

3.02 

3.03 

29 

3.04 

3.05 

3.06 

3.07 

3.08 

3.10 

3-11 

3.12 

3.13 

3.14 

30 

3.15 

3.16 

3.17 

3.18 

3.19 

3.20 

3.21 

3.22 

3.23 

3.24 

31 

3.25 

3.26 

3.27 

3.28 

3-29 

3.31 

3.32 

3.33 

3.34 

3.35 

32 

3.36 

3-37 

3.38 

3.39 

3.40 

3.41 

3.42 

3.43 

3.44 

3.45 

33 

3.46 

3.47 

3.48 

3.49 

3.50 

3.52 

3.53 

3.54 

3.55 

3.56 

34 

3.57 

3.58 

3.59 

3.60 

3.61 

3.62 

3.63 

3.64 

3.65 

3.66 

35 

3.67 

3.68 

3.69 

3.70 

3.71 

3.72 

3.74 

3.75 

3.76 

3.77 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

c 


91 


11 


SEDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


BAROMETER  :  655mm-  (from  652.51  to  657.50). 

Centi- 
grade 
Degrees. 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

0. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.05 

0.06 

0.07 

0.09 

0.10 

1 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

0.20 

2 

0.21 

0.22 

0.23 

0.24 

0.25 

*  0.26 

0.28 

0.29 

0.30 

0.31 

3 

0.32 

0.33 

0.34 

0.35 

0.36 

0.37 

0.38 

0.39 

0.40 

0.41 

4 

0.42 

0.43 

0.44 

0.46 

0.47 

0.48 

0.49 

0.50 

0.51 

0.52 

5 

0.53 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

0.60 

0.61 

0.62 

6 

0.63 

0.65 

0.66 

0.67 

0.68 

0.69 

0.70 

0.71 

0.72 

0.73 

7 

0.74 

0.75 

0.76 

0.77 

0.78 

0.79 

0.80 

0.81 

0.83 

0.84 

8 

0.85 

0.86 

0.87 

0.88 

0.89 

0.90 

0.91 

0.92 

0.93 

0.94 

9 

0.95 

0.96 

0.97 

0.98 

0.99 

1.00 

1.02 

1.03 

1.04 

1.05 

10 

1.06 

1.07 

1.08 

1.09 

1.10 

1.11 

1.12 

1.13 

1.14 

1.15 

11 

1.16 

1.17 

1.18 

1.20 

1.21 

1.22 

1.23 

1.24 

.25 

1.26 

12 

1.27 

1.28 

1.29 

1.30 

1.31 

1.32 

1.33 

1.34 

.35 

1.36 

13 

1.37 

1.39 

1.40 

1.41 

.42 

1.43 

1.44 

1.45 

.46 

1.47 

14 

1.48 

1.49 

1.50 

1.51 

.52 

1.53 

1.54 

1.55 

.57 

1.58 

15 

1.59 

1.60 

1.61 

1.62 

.63 

1.64 

1.65 

1.66 

.67' 

1.68 

16 

1.69 

1.70 

1.71 

1.72 

.73 

1.74 

1.76 

1.77 

1.78 

1.79 

17 

1.80 

1.81 

1.82 

1.83 

.84 

1.85 

1.86 

1.87 

1.88 

1.89 

18 

1.90 

1.91 

1.92 

1.94 

.95 

1.96 

1.97 

1.98 

1.99 

2.00 

19 

2.01 

2.02 

2.03 

2.04 

2.05 

2.06 

2.07 

2.08 

2.09 

2.10 

20     ! 

2.11 

2.13 

2.14 

2.15 

2.16 

2.17 

2.18 

2.19 

2.20 

2.21 

21 

2.22 

2.23 

2.24 

2.25 

2.26 

2.27 

2.28 

2.29 

2.31 

2.32 

22 

2.33 

2.34 

2.35 

2.36 

2.37 

2.38 

2.39 

2.40 

2.41 

2.42 

23 

2.43 

2.44 

2.45 

2.46 

2.47 

2.48 

2.50 

2.51 

2.52 

2.53 

24 

2.54 

2.55 

2.56 

2.57 

2.58 

2.59 

2.60 

2.61 

2.62 

2.63 

25 

2.64 

2.65 

2.66 

2.68 

2.69 

2.70 

2.71 

2.72 

2.73 

2.74 

26 

2.75 

2.76 

2.77 

2.78 

2.79 

2.80 

2.81 

2.82 

2.83 

2.84 

27 

2.85 

2.87 

2.88 

2.89 

2.90 

2.91 

2.92 

2.93 

2.94 

2.95 

28 

2.96 

2.97 

2.98 

2.99 

3.00 

3.01 

3.02 

3.03 

3-05 

3.06 

29 

3.07 

3.08 

3.09 

3.10 

3.11 

3.12 

3.13 

3.14 

3.15 

3.16 

30 

3.17 

3.18 

3.19 

3.20 

3.21 

3.22 

3.24 

3.25 

3.26 

3.27 

31 

3.28 

3.29 

3.30 

3.31 

^3.32 

3.33 

3.34 

3.35 

3.36 

3.37 

32 

3.38 

3.39 

3.40 

3.42 

3.43 

3.44 

3.45 

3.46 

3.47 

3.48 

33 

3.49 

3.50 

3.51 

3.52 

3.53 

3.54 

3.55 

3.56 

3.57 

3.58 

34 

3.59 

3.61 

3.62 

3.63 

3.64 

3.65 

3.66 

3.67 

3.68 

3.69 

35 

3.70 

3.71 

3.72 

3.73 

3.74 

3.75 

3.76 

3.77 

3.79 

3.80 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

8. 

9. 

92 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


12 


Centi- 
grade 
Degrees 

BAROMETER  :  660mm-  (from  657.51  to  662.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 
0 

Millim. 
0.00 

Millim. 
0.01 

Millim. 
0.02 

Millim. 
0.03 

Millim. 
0.04 

Millim. 
0.05 

Millim. 
0.06 

Millim. 
0.08 

Millim. 
0.09 

Millim. 
0.10 

1 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

0.20 

2 

0.21 

0.22 

0.23 

0.25 

0.26 

0.27 

0.28 

0.29 

0.30 

0.31 

3 

0.32 

0.33 

0.34 

0.35 

0.36 

0.37 

0.38 

0.39 

0.41 

0.42 

4 

0.43 

0.44 

0.45 

0.46 

0.47 

0.48 

0.49 

0.50 

0.51 

0.52 

5 

0.53 

0.54 

0.55 

0.57 

0.58 

0.59 

0.60 

0.61 

0.62 

0.63 

6 

0.64 

0.65 

0.66 

0.67 

0-68 

0.69 

0.70 

0.71 

0.72 

0.74 

7 

0.75 

0.76 

0.77 

0.78 

0.79 

0.80 

0.81 

0.82 

0.83 

0.84 

8 

0.85 

0.86 

0-87 

0.88 

0.90 

0.91 

0.92 

0.93 

0.94 

0.95 

9 

0.96 

0.97 

0.98 

0.99 

1.00 

1.01 

1.02 

1.03 

1.04 

1.06 

10 

1.07 

1.08 

1.09 

1.10 

1.11 

1.12 

1.13 

1.14 

1.15 

1.16 

11 

1.17 

1.18 

1.19 

1.20 

1.21 

1.23 

1.24 

.25 

1.26 

.27 

12 

1.28 

1.29 

1.30 

1.31 

1.32 

1.33 

.34 

.35 

1.36 

.37 

13 

1.39 

1.40 

1.41 

1.42 

1.43 

1.44 

.45 

.46 

1.47 

.48 

14 

1.49 

1.50 

1.51 

1.52 

1.53 

1.55 

.56 

.57 

1.58 

.59 

15 

1.60 

1.61 

1.62 

1.63 

1.64 

1.65 

.66 

.67 

1.68 

.69 

16 

1.70 

1.72 

1.73 

1.74 

1.75 

1.76 

.77 

1.78 

1.79 

.80 

17 

1.81 

1.82 

1.83 

1.84 

1.85 

1.86 

.88 

1.89 

1.90 

.91 

18 

1.92 

1.93 

1.94 

1.95 

1.96 

1.97 

.98 

1.99 

2.00 

2.01 

19 

2.02 

2.04 

2.05 

2.06 

2.07 

2.08 

2.09 

2.10 

2.11 

2.12 

20 

2.13 

2.14 

2.15 

2.16 

2.17 

2.18 

2.19 

2.21 

2.22 

2.23 

21 

2.24 

2.25 

2.26 

2.27 

2.28 

2.29 

2.30 

2.31 

2.32 

2.33 

22 

2.34 

2.35 

2.37 

2.38 

2.39 

2.40 

2.41 

2.42 

2.43 

2.44 

23 

2.45 

2.46 

2.47 

2.48 

2.49 

2.50 

2.51 

2.53 

2.54 

2.55 

24 

2.56 

2.57 

2.58 

2.59 

2.60 

2.61 

2.62 

2.63 

2.64 

2.65 

25 

2.66 

2.67 

2.68 

2.70 

2.71 

2.72 

2.73 

2.74 

2.75 

2.76 

26 

2.77 

2.78 

2.79 

2.80 

2.81 

2.82 

2.83 

2.84 

2.86 

2.87 

27 

2.88 

2.89 

2.90 

2.91 

2.92 

2.93 

2.94 

2.95 

2.96 

2.97 

28 

2.98 

2.99 

3.00 

3.02 

3.03 

3.04 

3.05 

3.06 

3.07 

3.08 

29 

3.09 

3.10 

3.11 

3.12 

3.13 

3.14 

3.15 

3.16 

3.17 

3.19 

30 

3.20 

3.21 

3.22 

3.23 

3.24 

3.25 

3.26 

3.27 

3.28 

3.29 

31 

3.30 

3.31 

3.32 

3.33 

3.35 

3.36 

3.37 

3.38 

3.39 

3.40 

32 

3.41 

3.42 

3.43 

3.44 

3.45 

3.46 

3.47 

3.48 

3.49 

3.51 

33 

3.52 

3.53 

3.54 

3.55 

3.56 

3.57 

3.58 

3.59 

3.60 

3.61 

34 

3.62 

3.63 

3.64 

3.65 

3.66 

3.68 

3.69 

3.70 

3.71 

3.72 

35 

3.73 

3.74 

3.75 

3.76 

3.77 

3.78 

3.79 
6. 

3.80 

3.81 

3.82 

0. 

1. 

2. 

3. 

4. 

5. 

7. 

8. 

9. 

93 


13 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING   POINT. 


BAROMETER  :  665mm-  (from  662.51  to  667.50), 

Centi- 
grade 

Tenths  of  Degrees. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.05 

0.06 

0.08 

0.09 

0.10 

1 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

0.20 

2 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

0.30 

0.31 

3 

0.32 

0.33 

0.34 

0.35 

0.37 

0.38 

0.39 

0.40 

0.41 

0.42 

4 

0.43 

0.44 

0.45 

0.46 

0.47 

0.48 

0.49 

0.51 

0.52 

0.53 

5 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

0.60 

0.61 

0.62 

0.63 

6 

0.64 

0.66 

0.67 

0.68 

0.69 

0.70 

0.71 

0.72 

0.73 

0.74 

7 

0.75 

0.76 

0.77 

0.78 

0.79 

0.81 

0.82 

0.83 

0.84 

0.85 

8 

0.86 

0.87 

0.88 

0.89 

0.90 

0.91 

0.92 

0.93 

0.95 

0.96 

9 

0.97 

0.98 

0.99 

1.00 

.01 

1.02 

1.03 

1.04 

.05 

1.06 

10 

1.07 

1.08 

1.10 

1.11 

.12 

1.13 

1.14 

1.15 

.16 

1.17 

11 

1.18 

.19 

1.20 

1.21 

.22 

.23 

1.25 

.26 

.27 

1.28 

12 

1.29 

.30 

1.31 

1.32 

.33 

.34 

1.35 

.36 

.37 

1.39 

13 

1,40 

.41 

1.42 

1.43 

.44 

.45 

1.46 

.47 

.48 

1.49 

14 

1.50 

.51 

1.52 

1.54 

.55 

.56 

1.57 

.58 

.59 

1.60 

15 

1.61 

.62 

1.63 

1.64 

.65 

.66 

1.67 

.69 

.70 

1.71 

16 

1.72 

.73 

1.74 

1.75 

1.76 

1.77 

1.78 

.79 

1.80 

1.81 

17 

1.83 

.84 

1.85 

1.86 

1.87 

1.88 

1.89 

.90 

1.91 

1.92 

18 

1.93 

.94 

1.95 

1.96 

1.98 

1.99 

2.00 

2.01 

2.02 

2-03 

19 

2.04 

2.05 

2.06 

2.07 

2.08 

2.09 

2.10 

2.11 

2.13 

2.14 

20 

2.15 

2.16 

2.17 

2.18 

2.19 

2.20 

2.21 

2.22 

2.23 

2.24 

21 

2.25 

2.27 

2.28 

2.29 

2.30 

2.31 

2.32 

2.33 

2.34 

2.35 

22 

2.36 

2.37 

2.38 

2.39 

2.40 

2.42 

2.43 

2.44 

2.45 

2.46 

23 

2.47 

2.48 

2.49 

2.50 

2.51 

2.52 

2.53 

2.54 

2.56 

2.57 

24 

2.58 

2.59 

2.60 

2.61 

2.62 

2.63 

2.64 

2.65 

2.66 

2.67 

25 

2.68 

2.69 

2.71 

2.72 

2.73 

2.74 

2.75 

2.76 

2.77 

2.78 

26 

2.79 

2.80 

2.81 

2.82 

2.83 

2.84 

2.86 

2.87 

2.88 

2.89 

27 

2.90 

2.91 

2.92 

2.93 

2.94 

2.95 

2.96 

2.97 

2.98 

3.00 

28 

3.01 

3.02 

3.03 

3.04 

3.05 

3.06 

3.07 

3.08 

3-09 

3.10 

29 

3.11 

3.12 

3.13 

3.15 

3.16 

3.17 

3.18 

3.19 

3.20 

3.21 

30 

3.22 

3.23 

3.24 

3.25 

3.26 

3.27 

3.28 

3.30 

3.31 

3.32 

31 

3.33 

3.34 

3.35 

3.36 

3.37 

3.38 

3.39 

3.40 

3.41 

3.42 

32 

3.44 

3.45 

3.46 

3.47 

3.48 

3.49 

3.50 

3.51 

3.52 

3.53 

33 

3.54 

3.55 

3.56 

3.57 

3.59 

3.60 

3.61 

3.62 

3.63 

3.64 

34 

3.65 

3.66 

3.67 

3.68 

3.69 

3.70 

3.71 

3.72 

3.74 

3.75 

35 

3.76 

3.77 

3.78 

3.79 

3.80 

3.81 

3.82 

3.83 

3.84 

3.85 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

94 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


14 


BAROMETER  :  670mm-  (from  667.51  to  672.50.) 

Centi- 
grade 

Tenths  of  Degrees. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.05 

0.07 

0.08 

0.09 

0.10 

1 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.20 

0.21 

2 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

0.30 

0.31 

3 

0.32 

0.34 

0.35 

0.36 

0.37 

0.38 

0.39 

0.40 

0.41 

0.42 

4 

0.43 

0.44 

0.45 

0.47 

0.48 

0.49 

0.50 

0.51 

0.52 

0.5S 

5 

0.54 

0.55 

0.56 

0:57 

05S 

0.60 

0.61 

0.62 

0.63 

0.64 

6 

0.65 

0.66 

0.67 

0.68 

0.69 

0.70 

0.71 

0.73 

0.74 

0.75 

7 

0.76 

0.77 

0-78 

).79 

0.80 

0.81 

0.82 

0.83 

0.84 

0.85 

8 

0.87 

0.88 

0.89 

0.90 

0.91 

0.92 

0.93 

0.94 

0.95 

0.96 

9 

0.97 

0.98 

1.00 

1.01 

1.02 

.03 

1.04 

1.05 

1.06 

1.07 

10 

1.08 

1.09 

1.10 

1.11 

1.13 

.14 

1.15 

1.16 

1.17 

1.18 

11 

.19 

1.20 

1.21 

1.22 

1.23 

.24 

1.25 

1.27 

1.28 

1.29 

12 

.30 

1.31 

1.32 

1.33 

1.34 

.35 

1.36 

1.37 

1.38 

1.40 

13 

.41 

1.42 

1.43 

1.44 

1.45 

.46 

1.47 

1.48 

1.49 

1.50 

14 

.51 

1.53 

1.54 

1.55 

1.56 

.57 

1.58 

1.59 

1.60 

1.61 

15 

.62 

1.63 

1.64 

1.66 

1.67 

.68 

1.69 

1.70 

1.71 

1.72 

16 

.73 

1.74 

1.75 

1.76 

1.77 

1.78 

1.80 

1.81 

1.82 

1.83 

17 

.84 

1.85 

1.86 

1.87 

1.88 

1.89 

1.90 

1.91 

1.92 

1.94 

18 

.95 

1.96 

1.97 

1.98 

1.99 

2.00 

2.01 

2.02 

2.03 

2.04 

19 

2.06 

2.07 

2.08 

2.09 

2.10 

2.11 

2.12 

2.13 

2.14 

2.15 

20 

2.16 

2.17 

2.18 

2.20 

2.21 

2.22 

2.23 

2.24 

2.25 

2.26 

21 

2.27 

2.28 

2.29 

2.30 

2.31 

2.33 

2.34 

2.35 

2.36 

2.37 

22 

2.38 

2.39 

2.40 

2.41 

2.42 

2.43 

2.44 

2.46 

2.47 

2,48 

23 

2.49 

2.50 

2.51 

2.52 

2.53 

2.54 

2.55 

2.56 

2.57 

2.59 

24 

2.60 

2.61 

2.62 

2.63 

2.64 

2.65 

2.66 

2.67 

2.68 

2.69 

25 

2.70 

2.71 

2.73 

2.74 

2.75 

2.76 

2.77 

2.78 

2.79 

2.80 

26 

2.81 

2.82 

2.83 

2.84 

2.86 

2.87 

2.88 

2.89 

2.90 

2.91 

27 

2.92 

2.93 

2.94 

2.95 

2.96 

2.97 

2.99 

3.00 

3.01 

3.02 

28 

3.03 

3.04 

3.05 

3.06 

3.07 

3.08 

3.09 

3.10 

3.11 

3.13 

29 

3.14 

3.15 

3.16 

3.17 

3.18 

3.19 

3.20 

3.21 

3.22 

3.23 

30 

3.24 

3.26 

3.27 

3.28 

3.29 

3.30 

3.31 

3.32 

3.33 

3.34 

31 

3.35 

3.36 

3.37 

3.39 

3.40 

3.41 

3.42 

3.43 

3.44 

3.45 

32 

3.46 

3.47 

3.48 

3.49 

3.50 

3.52 

3.53 

3.54 

3.55 

3.56 

33 

3-57 

3.58 

3.59 

3.60 

3.61 

3.62 

3.63 

3.64 

3.66 

3.67 

34 

3.68 

3.69 

3.70 

3.71 

3.72 

3.73 

3.74 

3.75 

3.76 

3.77 

35 

3.79 

3.80 

3.81 

3.82 

3.83 

3.84 

3.85 

3.86 

3.87 

3.88 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

8. 

9. 

c 


95 


15 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


BAROMETER  :  675mm-  (from  672.51  to  677.50). 

Centi- 
grade 

Tenths  of  Degrees. 

Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.05 

0.07 

0.08 

0.09 

0.10 

1 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.19 

0.20 

0.21 

2 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

0.31 

0.32 

3 

0.33 

0.34 

0.35 

0.36 

0.37 

0.38 

0.39 

0.40 

0.41 

0.42 

4 

0.44 

0.45 

0.46 

0.47 

0.48 

0.49 

0.50 

0.51 

0.52 

0.53 

5 

0.54 

0.56 

0.57 

0.58 

0.59 

0.6/> 

0.61 

0.62 

0.63 

0.64 

6 

0.65 

0.66 

0.68 

0.69 

0.70 

0.71 

0.72 

0.73 

0.74 

0.75 

7 

0.76 

0.77 

0.78 

0.80 

0.81 

0.82 

0.83 

0.84 

0.85 

0.86 

8 

0.87 

0.88 

0.89 

0.90 

0.92 

0.93 

•a/&4 

0.95 

0.96 

0.97 

9 

0.98 

0.99 

1.00 

1.01 

1.02 

1.03 

1.05 

1.06 

1.07 

1.08 

10 

1.09 

1.10 

1.11 

1.12 

1.13 

1.14 

1.15 

1.17 

1.18 

1.19 

11 

1.20 

.21 

1.22 

1.23 

1.24 

1.25 

1.26 

1.27 

1.29 

1.30 

12 

1.31 

.32 

1.33 

.34 

1.35 

1.36 

1.37 

1.38 

1.39 

1.41 

13 

1.42 

.43 

1.44 

.45 

1.46 

1.47 

1.48 

1.49 

1.50 

1.51 

14 

1.53 

.54 

1.55 

.56 

1.57 

1.58 

1.59 

1.60 

1.61 

1.62 

15 

1.63 

.65 

1.66 

.67 

1.68 

1.69 

1.70 

1.71 

1.72 

1.73 

16 

1.74 

.75 

1.76 

.78 

1.79 

1.80 

1.81 

1.82 

1.83 

1.84 

17 

1.85 

.86 

1.87 

.88 

1.90 

1.91 

1.92 

1.93 

1.94 

1.95 

18 

1.96 

.97 

1.98 

.99 

2.00 

2.02 

2.03 

2.04 

2.05 

2.06 

19 

2.07 

2.08 

2.09 

2.10 

2.11 

2.12 

2.14 

2.15 

2.16 

2.17 

20 

2.18 

2.19 

2.20 

2.21 

2.22 

2.23 

2.24 

2.26 

2.27 

2.28 

21 

2.29 

2.30 

2.31 

2.32 

2.33 

2.34 

2.35 

2.36 

2.38 

2.39 

22 

2.40 

2.41 

2.42 

2.43 

2.44 

2.45 

2.46 

2.47 

2.48 

2.49 

23 

2.51 

2.52 

2.53 

2.54 

2.55 

2.56 

2.57 

2.58 

2.59 

2.60 

24 

2.61 

2.63 

2.64 

2.65 

2.66 

2.67 

2.68 

2.69 

2.70 

2.71 

25 

2.72 

2.73 

2.75 

2.76 

2.77 

2.78 

2.79 

2.80 

2.81 

2.82 

26 

2.83 

2.84 

2.85 

2.87 

2.88 

2.89 

2.90 

2,91 

2.92 

2.93 

27 

2.94 

2.95 

2.96 

2.97 

2.99 

3.00 

3.01 

3.02 

3.03 

3.04 

28 

3.05 

3.06 

3.07 

3.08 

3.09 

3.10 

3.12 

3.13 

3-14 

3.15 

29 

3.16 

3.17 

3.18 

3.19 

3.20 

3.21 

3.22 

3.24 

3.25 

3.26 

30 

3.27 

3.28 

3.29 

3.30 

3.31 

3.32 

3.33 

3.34 

3.36 

3.37 

31 

3.38 

3.39 

3.40 

3.41 

3.42 

3.43 

3.44 

3.45 

3.46 

3.48 

32 

3.49 

3.50 

3.51 

3.52 

3.53 

3.54 

3.55 

3.56 

3.57 

3.58 

33 

3.60 

3.61 

3.62 

3.63 

3.64 

3.65 

3.66 

3.67 

3.68 

3.69 

34 

3.70 

3.72 

3.73 

3.74 

3.75 

3.76 

3.77 

3.78 

3.79 

3.80 

35 

3.81 

3.82 

3.83 

3.85 

3.86 

3.87 

3.88 

3.89 

3.90 

3.91 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

8. 

9. 

96 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


16 


BAROMETER  :  680mra-  (from  677.51  to  682.50). 

Centi- 
grade 

Tenths  of  Degrees. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim.    ! 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.05 

0.07 

0.08 

0.09 

0.10 

1 

0.11 

0.12 

0.13 

0.14 

0.15 

0.16 

0.18 

0.19 

0.20 

0.21 

2 

0.22 

0.23 

0.24 

0.25 

0.26 

0.27 

0.29 

0.30 

0.31 

0.32 

3 

0.33 

0.34 

0.35 

0.36 

0.37 

0.38 

0.40 

0.41 

0.42 

0.43 

4 

0.44 

0.45 

0.46 

0.47 

0.48 

0.49 

0.50 

0.52 

0.53 

0.54 

5 

0.55 

0.56 

0.57 

0.58 

0.59 

0.60 

0.61 

0.63 

0.64 

0.65 

6 

0.66 

0.67 

0.68 

0.69 

0.70 

0.71 

0.72 

0.74 

0.75 

0.76 

7 

0.77 

0.78 

0.79 

0.80 

0.81 

0.82 

0.83 

0.85 

0.86 

0.87 

8 

0.88 

0.89 

0.90 

0.91 

0.92 

0.93 

0.94 

0.95 

0.97 

0.98 

9 

0.99 

1.00 

1.01 

1.02 

1.03 

1.04 

1.05 

.06 

1.08 

1.09 

10 

1.10 

1.11 

1.12 

1.13 

1.14 

1.15 

1.16 

.17 

1.19 

1.20 

11 

.21 

1.22 

1.23 

1.24 

1.25 

1.26 

1.27 

.28 

1.30 

1.31 

12 

.32 

1.33 

1.34 

1.35 

1.36 

1.37 

.38 

.39 

.40 

1.42 

13 

.43 

1.44 

1.45 

1.46 

.47 

1.48 

.49 

.50 

.51 

1.53 

14 

.54 

1.55 

1.56 

1.57 

.58 

1.59 

.60 

.61 

.62 

1.64 

15 

.65 

1.66 

1.67 

1.68 

.69 

1.70 

.71 

.72 

.73 

1.75 

16 

.76 

1.77 

1.78 

1.79 

.80 

1.81 

.82 

1.83 

.84 

1.85 

17 

.87 

1.88 

1.89 

1.90 

.91 

1.92 

.93 

1.94 

.95 

1.96 

18 

.98 

1.99 

2.00 

2.01 

2.02 

2.03 

2.04 

2.05 

2.06 

2.07 

19 

2.09 

2.10 

2.11 

2.12 

2.13 

2.14 

2.15 

2.16 

2.17 

2.18 

20 

2.20 

2.21 

2.22 

2.23 

2.24 

2.25 

2.26 

2.27 

2.28 

2.29 

21 

2.30 

2.32 

2.33 

2.34 

2.35 

2.36 

2.37 

2.38 

2.39 

2.40 

22 

2.41 

2.43 

2.44 

2.45 

2.46 

2.47 

2.48 

2.49 

2.50 

2.51 

23 

2.52 

2.54 

2.55 

2.56 

2.57 

2.58 

2.59 

2.60 

2.61 

2.62 

24 

2.63 

2.65 

2.66 

2.67 

2.68 

2.69 

2.70 

2.71 

2.72 

2.73 

25 

2.74 

2.75 

2.77 

2.78 

2.79 

2.80 

2.81 

2.82 

2.83 

2.84 

26 

2.85 

2.86 

2.88 

2.89 

2.90 

2.91 

2.92 

2.93 

2.94 

2.95 

27 

2.96 

2.97 

2.99 

3.00 

3.01 

3.02 

3.03 

3.04 

3.05 

3.06 

28 

3.07 

3.08 

3.10 

3.11 

3.12 

3.13 

3.14 

3.15 

3.16 

3.17 

29 

3.18 

3.19 

3.20 

3.22 

3.23 

3.24 

3.25 

3.26 

3.27 

3.28 

30 

3.29 

3.30 

3.31 

3.33 

3.34 

3.35 

3.36 

3.37 

3.38 

3.39 

31 

3.40 

3.41 

3.42 

3.44 

3.45 

3.46 

3.47 

3.48 

3.49 

3.50 

32 

3.51 

3.52 

3.53 

3.54 

3.56 

3.57 

3.58 

3.59 

3.60 

3.61 

33 

3.62 

3.63 

3.64 

3.65 

3.67 

3.68 

3.69 

3.70 

3.71 

3.72 

34 

3.73 

3.74 

3.75 

3.76 

3.78 

3.79 

3.80 

3.81 

3.82 

3.83 

35 

3.84 

3.85 

3.86 

3.87 

3.89 

3.90 

3.91 

3.92 

3.93 

3.94 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

97 


17 


REDUCTION    OF    THE    BAROMETER   TO    THE    FREEZING    POINT. 


Centi- 
grade 
Degrees. 

BAROMETER  :  685mm-  (from  682.51  to  687.50). 

Tenths  of  Degrees. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

0 

Millim. 
0.00 

Millim. 
0.01 

Millim. 
0.02 

Millim. 
0.03 

Millim. 
0.04 

Millim. 
0.06 

Millim. 
0.07 

Millim. 
0.08 

Millim. 
0.09 

Millim. 
0.10 

1 

0.11 

9.12 

0.13 

0.14 

0.15 

0.17 

0.18 

0.19 

0.20 

0.21 

2 

0.22 

0.23 

0.24 

0.25 

0.27 

0.28 

0.29 

0.30 

0.31 

0.32 

3 

0.33 

0.34 

0.35 

0.36 

0.38 

0.39 

0.40 

0.41 

0.42 

0.43 

4 

0.44 

0.45 

0.46 

0.48 

0.49 

0.50 

0.51 

0.52 

0.53 

0.54 

5 

0.55 

0.56 

0.57 

0.59 

0.60 

0.61 

0.62 

0.63 

0.64 

0.65 

6 

0.66 

0.67 

0.69 

0.70 

0.71 

0.72 

0.73 

0.74 

0.75 

0.76 

7 

0.77 

0.78 

0.80 

0.81 

0.82 

0.83 

0.84 

0.85 

0.86 

0.87 

8 

0.88 

0.90 

0.91 

0.92 

0.93 

0.94 

0.95 

0.96 

0.97 

0.98 

9 

1.00 

1.01 

.02 

1.03 

1.04 

.05 

1.06 

1.07 

1.08 

1.09 

10 

1.11 

1.12 

.13 

1.14 

1.15 

.16 

1.17 

1.18 

1.19 

1.21 

11 

.22 

1.23 

.24 

1.25 

1.26 

.27 

1.28 

.29 

1.30 

1.32 

12 

.33 

1.34 

.35 

1.36 

1.37 

.38 

1.39 

.40 

1.42 

1.43 

13 

.44 

1.45 

.46 

1.47 

1.48 

.49 

1.50 

.51 

1.53 

1.54 

14 

.55 

1.56 

.57 

1.58 

1.59 

.60 

1.61 

.63 

1.64 

1.65 

15 

.66 

1.67 

.68 

1.69 

1.70 

.71 

1.72 

.74 

1.75 

1.76 

16 

.77 

1.78 

1.79 

1.80 

1.81 

1.82 

1.84 

.85 

1.86 

1.87 

17 

.88 

1.89 

1.90 

1.91 

1.92 

1.93 

1.95 

.96 

1.97 

1.98 

18 

.99 

2.00 

2.01 

2.02 

2.03 

2.05 

2.06 

2.07 

2.08 

2.09 

19 

2.10 

2.11 

2.12 

2.13 

2.14 

2.16 

2.17 

2-18 

2.19 

2.20 

20 

2.21 

2.22 

2.23 

2.24 

2.26 

2.27 

2.28 

2.29 

2.30 

2.31 

21 

2.32 

2.33 

2.34 

2.35 

2.37 

2.38 

2.39 

2.40 

2.41 

2.42 

22 

2.43 

2.44 

2.45 

2.47 

2.48 

2.49 

2.50 

2.51 

2.52 

2.53 

23 

2.54 

2.55 

2.56 

2.58 

2.59 

2.60 

2.61 

2.62 

2.63 

2.64 

24 

2.65 

2.66 

2.68 

2.69 

2.70 

2.71 

2.72 

2.73 

2.74 

2.75 

25 

2.76 

2.78 

2.79 

2.80 

2.81 

2.82 

2.83 

2.84 

2.85 

2.86 

26 

2.87 

2.89 

2.90 

2.91 

2.92 

2.93 

2.94 

2.95 

2.96 

2.97 

27 

2.99 

3.00 

3,01 

3.02 

3.03 

3.04 

3.05 

3.06 

3.07 

3.08 

28 

3.10 

3.11 

3.12 

3.13 

3.14 

3.15 

3.16 

3.17 

3.18 

3.20 

29 

3.21 

3.22 

3.23 

3.24 

3.25 

3.26 

3.27 

3.28 

3.29 

3.31 

30 

3.32 

3.33 

3.34 

3.35 

3.36 

3.37 

3.38 

3.39 

3.41 

3.42 

31 

3.43 

3.44 

3.45 

3.46 

3.47 

3.48 

3.49 

3.50 

3.52 

3.53 

32 

3.54 

3.55 

3.56 

3.57 

3.58 

3.59 

3.60 

3.62 

3.63 

3.64 

33 

3.65 

3.66 

3.67 

3.68 

3.69 

3-70 

3.71 

3.73 

3.74 

3.75 

34 

3.76 

3.77 

3.78 

3.79 

3.80 

3.81 

3.83 

3.84 

3.85 

3.86 

35 

3.87 

3.88 

3.89 

3.90 

3.91 

3.92 

3.94 

3.95 

3.96 

3.97 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

y. 

8. 

9. 

98 


REDUCTION    OF    THE    BAROMETER   TO    THE    FREEZING    POINT. 


18 


BAROMETER  :  690mm-  (from  687.51  to  692.50). 

Centi- 
grade 
Degrees. 

Tenths  of  Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

S. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.06 

0.07 

0.08 

0.09 

0.10 

1 

0.11 

0.12 

0.13 

0.14 

0.16 

0.17 

0.18 

0.19 

0.20 

0.21 

2 

0.22 

0.23 

0.25 

0.26 

0.27 

0.28 

0.29 

0.30 

0.31 

0.32 

3 

0.33 

0.35 

0.36 

0.37 

0.38 

0.39 

0.40 

0.41 

0.42 

0.43 

4 

0.45 

0.46 

0.47 

0.48 

0.49 

0.50 

0.51 

0.52 

0.53 

0.55 

5 

0.56 

0.57 

0.58 

0.59 

0.60 

0.61 

0.62 

0.63 

0.65 

0.66 

6 

0.67 

0.68 

0.69 

0.70 

0.71 

0.72 

0.74 

0.75 

0.76 

0.77 

7 

0.78 

0.79 

0.80 

0.81 

0.82 

0.84 

0.85 

0.86 

0.87 

0.88 

8 

0.89 

0.90 

0.91 

0.92 

0.94 

0.95 

0.96 

0.97 

0.98 

0.99 

9 

1.00 

1.01 

1.02 

1.04 

.05 

1.06 

1.07 

1.08 

1.09 

1.10 

10 

1.11 

1.12 

1.14 

1.15 

.16 

1.17 

1.18 

1.19 

1.20 

1.21 

11 

1.23 

1.24 

.25 

1.26 

.27 

1.28 

1.29 

1.30 

1.31 

.33 

12 

1.34 

1.35 

.36 

1.37 

.38 

1.39 

1.40 

1.41 

1.43 

.44 

13 

1.45 

1.46 

.47 

1.48 

.49 

1.50 

1.51 

1.53 

1.54 

.55 

14 

1.56 

1.57 

.58 

1.59 

.60 

1.61 

1.63 

1.64 

1.65 

.66 

15 

1.67 

1.68 

.69 

1.70 

1.72 

1.73 

1.74 

1.75 

1.76 

.77 

16 

1.78 

1.79 

1.80 

1.82 

1.83 

1.84 

1.85 

1.86 

1.87 

1.88 

17 

1.89 

1.90 

1.92 

1.93 

1.94 

1.95 

1.96 

1.97 

1.98 

1.99 

18 

2.00 

2.02 

2.03 

2.04 

2.05 

2.06 

2.07 

2.08 

2.09 

2.10 

19 

2.12 

2.13 

2.14 

2.15 

2.16 

2.17 

2.18 

2.19 

2.21 

2.22 

20 

2.23 

2.24 

2.25 

2.26 

2.27 

2.28 

2.29 

2.31 

2.32 

2.33 

21 

2.34 

2.35 

2.36 

2.37 

2.38 

2.39 

2.41 

2.42 

2.43 

2.44 

22 

2.45 

2.46 

2.47 

2.48 

2.49 

2.51 

2.52 

2.53 

2.54 

2.55 

23 

2.56 

2.57 

2.58 

2.59 

2.61 

2.62 

2.63 

2.64 

2.65 

2.66 

24 

2.67 

2.68 

2.70 

2.71 

2.72 

2.73 

2.74 

2.75 

2.76 

2.77 

25 

2.78 

2.80 

2.81 

2.82 

2.83 

2.84 

2.85 

2.86 

2.87 

2.88 

26 

2.90 

2.91 

2.92 

2.93 

2.94 

2.95 

2.96 

2.97 

2.98 

3.00 

27 

3.01 

3.02 

3.03 

3.04 

3.05 

3.06 

3.07 

3.08 

3.10 

3.11 

28 

3.12 

3.13 

3.14 

3.15 

3.16 

3.17 

3.19 

3.20 

3.21 

3.22 

29 

3.23 

3.24 

3.25 

3.26 

3.27 

3.29 

3.30 

3.31 

3.32 

3.33 

30 

3.34 

3.35 

3.36 

3.37 

3.39 

3.40 

3.41 

3.42 

3.43 

3.44 

31 

3.45 

3.46 

3.47 

3.49 

3.50 

3.51 

3.52 

3.53 

3.54 

3.55 

32 

3.56 

3.57 

3.59 

3.60 

3.61 

3.62 

3.63 

3.64 

3.65 

3.66 

33 

3.68 

3.69 

3.70 

3.71 

3.72 

3.73 

3.74 

3.75 

3.76 

3.78 

34 

3.79 

3.80 

3.81 

3.82 

3.83 

3.84 

3.85 

3.86 

3.88 

3.89 

35 

3.90 

3.91 

3.92 

3.93 

3.94 

3.95 

3.96 

3.98 

3.99 

4.00 

0. 

1.           2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

c 


99 


19 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


BAROMETER  :  695mm  (from  692.51  tq  697.50). 

Centi- 
grade 

Tenths  of  Degrees. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.04 

0.06 

0.07 

0.08 

0.09 

0.10 

1 

0.11 

0.12 

0.13 

0.15 

0.16 

0.17 

0.18 

0.19 

0.20 

0.21 

2 

0.22 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

0.30 

0.31 

0.33 

3 

0.34 

0.35 

0.36 

0.37 

0.38 

0.39 

0.40 

0.42 

0.43 

0.44 

4 

0.45 

0.46 

0.47 

0.48 

0.49 

0.50 

0.52 

0.53 

0.54 

0.55 

5 

0.56 

0.57 

0.58 

0.59 

0.61 

0.62 

0.63 

0.64 

0.65 

0.66 

6 

0.67 

0.68 

0.70 

0.71 

0.72 

0.73 

0.74 

0.75 

0.76 

0.77 

7 

0.79 

0.80 

0.81 

0.82 

0.83 

0.84 

0.85 

0.86 

0.87 

0.89 

8 

0.90 

0.91 

0.92 

0.93 

0.94 

0.95 

0.96 

0.98 

0.99 

.00 

9 

1.01 

1.02 

1.03 

1.04 

1.05 

1.07 

1.08 

.09 

.10 

.11 

10 

1.12 

1.13 

1.14 

1.16 

1.17 

1.18 

1.19 

.20 

.21 

.22 

11 

1.23 

1.25 

1.26 

1.27 

1.28 

1.29 

1.30 

.31 

.32 

.33 

12 

1.35 

1.36 

1.37 

1.38 

1.39 

1.40 

1.41 

.42 

.44 

.45 

13 

1.46 

1.47 

1.48 

1.49 

1.50 

1.51 

1.52 

.54 

.55 

.56 

14 

1.57 

1.58 

1.59 

1.60 

1.61 

1.63 

1.64 

.65 

.66 

.67 

15 

1.68 

1.69 

1.71 

1.72 

1.73 

1.74 

1.75 

.76 

.77 

.78 

16 

1.79 

1.81 

1.82 

1.83 

1.84 

1.85 

1.86 

1.87 

1.88 

1.90 

17 

1.91 

1.92 

1.93 

1.94 

1.95 

1.96 

1.97 

1.99 

2.00 

2.01 

18 

2.02 

2.03 

2.04 

2.05 

2.06 

2.08 

2.09 

2.10 

2.11 

2.12 

19 

2.13 

2.14 

2.15 

2.16 

2.18 

2.19 

2.20 

2.21 

2.22 

2.23 

20 

2.24 

2.25 

2.27 

2.28 

2.29 

2.30 

2.31 

2.32 

2.33 

2.34 

21 

2.36 

2.37 

2.38 

2.39 

2.40 

2.41 

2.42 

2.43 

2.45 

2.46 

22 

2.47 

2.48 

2.49 

2.50 

2.51 

2.52 

2.53 

2.55 

2.56 

2.57 

23 

2.58 

2.59 

2.60 

2.61 

2.62 

2.64 

2.65 

2.66 

2.67 

2.68 

24 

2.69 

2.70 

2.71 

2.73 

2.74 

2.75 

2.76 

2.77 

2.78 

2.79 

25 

2.80 

2.82 

2.83 

2.84 

2.85 

2.86 

2.87 

2.88 

2.89 

2.91 

26 

2,92 

2.93 

2.94 

2.95 

2.96 

2.97 

2.98 

3.00 

3.01 

3.02 

27 

3.03 

3.04 

3.05 

3.06 

3.07 

3.08 

3.10 

3.11 

3.12 

3.13 

28 

3.14 

3.15 

3.16 

3.17 

3.19 

3.20 

3.21 

3.22 

3.23 

3.24 

29 

3.25 

3.26 

3.28 

3.29 

3.30 

3.31 

3.32 

3.33 

3.34 

3.35 

30 

3.37 

3.38 

3.39 

3.40 

3.41 

3.42 

3.43 

3.44 

3.45 

3.47 

31 

3.48 

3.49 

3.50 

3.51 

3.52 

3.53 

3.54 

3.56 

3.57 

3.58 

32, 

3.59 

3.60 

3.61 

3.62 

3.63 

3.65 

3.66 

3.67 

3.68 

3.69 

33 

3.70 

3.71 

3.72 

3.74 

3.75 

3.76 

3.77 

3.78 

3.79 

3.80 

34 

3.81 

3.83 

3.84 

3.85 

3.86 

3.87 

3.88 

3.89 

3.90 

3.91 

35 

3.93 

3.94 

3.95 

3.96 

3.97 

3.98 

3.99 

4.00 

4.02 

4.03 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

100 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


Centi- 
grade 
Degrees. 

BAROMETER  :  700mm  (from  697.51  to  702.50). 

Tenths  of  Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

M  Him. 

0 

0.00 

0.01 

0.02 

0.03 

0.05 

0.06 

0.07 

0.08 

0.09 

0.10 

1 

0.11 

0.12 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

0.20 

0.21 

2 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

0.31 

0.32 

0.33 

3 

0.34 

0.35 

0.36 

0.37 

0.38 

0.40 

0.41 

0.42 

0.43 

0.44 

4 

0.45 

0.46 

0.47 

0.49 

0.50 

0.51 

0.52 

0.53 

0.54 

0.55 

5 

0.56 

0.58 

0.59   , 

0.60 

0.61 

0.62 

0.63 

0.64 

0.66 

0.67 

6 

0.68 

0.69 

0.70 

0.71 

0.72 

0.73 

0.75 

0.76 

0.77 

0.78 

7 

0.79 

0.80 

0.81 

0.82 

0.84 

0.85 

0.86 

0.87 

0.88 

0.89 

8 

0.90 

0.92 

0.93 

0.94 

0.95 

0.96 

0.97 

0.98 

0.99 

.01 

9 

1.02 

1.03 

1.04 

1.05 

.06 

1.07 

1.08 

.10 

1.11 

.12 

10 

1.13 

1.14 

1.15 

1.16 

.17 

1.19 

1.20 

.21 

1.22 

.23 

11 

.24 

1.25 

1.27 

1.28 

.29 

.30 

.31 

.32 

1.33 

.34 

12 

.36 

1.37 

1.38 

1.39 

.40 

.41 

.42 

.43 

1.45 

.46 

13 

.47 

1.48 

1.49 

1.50 

.51 

.53 

.54 

.55 

1.56 

.57 

14 

.58 

1.59 

1.60 

1.62 

.63 

.64 

.65 

.66 

1.67 

.68 

15 

.69 

1.71 

1.72 

1.73 

1.74 

.75 

.76 

.77 

1.79 

.80 

16 

1.81 

1.82 

1.83 

1.84 

1.85 

.86 

.88 

1.89 

1.90 

1.91 

17 

1.92 

1.93 

1.94 

1.95 

1.97 

.98 

.99 

2.00 

2.01 

2.02 

18 

2.03 

2.04 

2.06 

2.07 

2.08 

2.09 

2.10 

2.11 

2.12 

2.14 

19 

2.15 

2.16 

2.17 

2.18 

2.19 

2.20 

2.21 

2.23 

2.24 

2.25 

20 

2.26 

2.27 

2.28 

2.29 

2.30 

2.32 

2.33 

2.34 

2.35 

2.36 

21 

2.37 

2.38 

2.40 

2.41 

2.42 

2.43 

2.44 

2.45 

2.46 

2.47 

22 

2.49 

2.50 

2.51 

2.52 

2.53 

2.54 

2.55 

2.56 

2.58 

2.59 

23 

2.60 

2.61 

2.62 

2.63 

2.64 

2.66 

2.67 

2.68 

2.69 

2.70 

24 

2.71 

2.72 

2.73 

2.75 

2.76 

2.77 

2.78 

2.79 

2.80 

2.81 

25 

2.82 

2.84 

2.85 

2.86 

2.87 

2.88 

2.89 

2.90 

2.91 

2.93 

26 

2.94 

2.95 

2.96 

2.97 

2.98 

2.99 

3.01 

3.02 

3.03 

3.04 

27 

3.05 

3.06 

3.07 

3.08 

3.10 

3.11 

3.12 

3.13 

3.14 

3.15 

28 

3.16 

3.17 

3.19 

3.20 

3.21 

3.22 

3.23 

3.24 

3.25 

3.27 

29 

3.28 

3.29 

3.30 

3.31 

3.32 

3.33 

3-34 

3.36 

3.37 

3.38 

30 

3.39 

3.40 

3.41 

3.42 

3.43 

3.45 

3.46 

3.47 

3.48 

3.49 

31 

3.50 

3.51 

3.52 

3.54 

3.55 

3.56 

3.57 

3.58 

3.59 

3.60 

32 

3.62 

3.63 

3.64 

3.65 

3.66 

3.67 

3.68 

3.69 

3.71 

3.72 

33 

3.73 

3.74 

3.75 

3.76 

3.77 

3.78 

3.80 

3.81 

3.82 

3.83 

34 

3.84 

3.85 

3.86 

3.88 

3.89 

3.90 

3.91 

3.92 

3.93 

3.94 

35 

3.95 

3.97 

3.98 

3.99 

4.00 

4.01 

4.02 

4.03 

4.04 

4.06 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

c 


101 


21 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING   POINT. 


BAROMETER  :  705mm-  (from  702.51  to  707.50). 

Centi- 

grade 

Tenths  of  Degrees. 

Degrees. 

, 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.05 

0.06 

0.07 

0.08 

0.09 

0.10 

1 

0.11 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

0-20 

0.22 

2 

0.23 

0.24 

0.25 

0.26 

0.27 

0.28 

0.30 

0.31 

0.32 

033 

3 

0.34 

0.35 

0.36 

0.38 

0.39 

0.40 

0.41 

0.42 

0.43 

0.44 

4 

0.46 

0.47 

0.48 

0.49 

0.50 

0.51 

0.52 

0.53 

0.55 

0.56 

5 

0.57 

0.58 

0.59 

0.60 

0.61 

0.63 

.0.64 

0.65 

0.66 

0.67 

6 

0.68 

0.69 

0.71 

0.72 

0.73 

0.74 

0.75 

0.76 

0.77 

0.79 

7 

0.80 

0.81 

0.82 

0.83 

0.84 

0.85 

0.86 

0.88 

0.89 

0.90 

8 

0.91 

0.92 

0.93 

0.94 

0.96 

0.97 

0.98 

0.99 

1.00 

1.01 

9 

.02 

1.04 

1.05 

1.06 

1.07 

1.08 

1.09 

1.10 

1.12 

1.13 

10 

.14 

1.15 

1.16 

1.17 

1.18 

1.19 

1.21 

1.22 

1.23 

1.24 

11 

.25 

1.26 

1.27 

1.29 

1.30 

1.31 

1.32 

1.33 

1.34 

1.35 

12 

.37 

1.38 

1.39 

1.40 

1.41 

1.42 

1.43 

1.45 

1.46 

1.47 

13 

.48 

1.49 

1.50 

1.51 

1.52 

1.54 

1.55 

1.56 

1.57 

1.58 

14 

.59 

1.60 

1.62 

1.63 

1.64 

1.65 

1.66 

1.67 

1.68 

1.70 

15 

.71 

1.72 

1.73 

1.74 

1.75 

1.76 

1.78 

1.79 

1.80 

1.81 

16 

1.82 

1.83 

1.84 

1.85 

1.87 

1.88 

1.89 

1.90 

1.91 

1.92 

17 

1.93 

1.95 

1.96 

1.97 

1.98 

1.99 

2.00 

2.01 

2.03 

2.04 

18 

2.05 

2.06 

2.07 

2.08 

2.09 

2.11 

2.12 

2.13 

2.14 

2.15 

19 

2.16 

2.17 

2.18 

2.20 

2.21 

2.22 

2.23 

2.24 

2.25 

2.26 

20 

2.28 

2.29 

2.30 

2.31 

2.32 

2.33 

2.34 

2.36 

2.37 

2.38 

21 

2.39 

2.40 

2.41 

2.42 

2.44 

2.45 

2.46 

2.47 

2.48 

2.49 

22 

2.50 

2.51 

2.53 

2.54 

2.55 

2.56 

2.57 

2.58 

2.59 

2.61 

23 

2.62 

2.63 

2.64 

2.65 

2.66 

2.67 

2.69 

2.70 

2.71 

2.72 

24 

2.73 

2.74 

2.75 

2.77 

2.78 

2.79 

2.80 

2.81 

2.82 

2.83 

25 

2.84 

2.86 

2.87 

2.88 

2.89 

2.90 

2.91 

2.92 

2.94 

2.95 

26 

2.96 

2.97 

2.98 

2.99 

3.00 

3.02 

3.03 

3.04 

3.05 

3.06 

27 

3.07 

3.08 

3.10 

3.11 

3.12 

3.13 

3.14 

3.15 

3.16 

3.17 

28 

3.19 

3.20 

3.21 

3.22 

3.23 

3.24 

3.25 

3.27 

3.28 

3.29 

29 

3.30 

3.31 

3.32 

3.33 

3.35 

3.36 

3.37 

3.38 

3.39 

3.40 

30 

3.41 

3.42 

3.44 

3.45 

3.46 

3.47 

3.48 

3.49 

3.50 

3.52 

31 

3.53 

3.54 

3.55 

3.56 

3.57 

3.58 

3.60 

3-61 

3.62 

3.63 

32 

3.64 

3.65 

3.66 

3.68 

3.69 

3.70 

3.71 

3.72 

3.73 

3.74 

33 

3.75 

3.77 

3.78 

3.79 

3.80 

3.81 

3.82 

3.83 

3.85 

3.86 

34 

3.87 

3.88 

3.89 

3.90 

3.91 

3.93 

3.94 

3.95 

3.96 

3.97 

35 

3.98 

3.99 

4.01 

4.02 

4.03 

4.04 

4.05 

4.06 

4.07 

4.08 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

0. 

1 

102 


REDUCTION    OF    THE    BAROMETER   TO    THE    FREEZING   POINT. 


BAROMETER  :  710mm-  (from  707.51  to  712.50). 

Centi- 

grade 

Tenths  of  Degrees. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.05 

0.06 

0.07 

0.08 

0.09 

0.10 

1 

0.11 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.19 

0.21 

0.22 

2 

0.23 

0.24 

0.25 

0.26 

0.28 

0.29 

0.30 

0.31 

0.32 

0.33 

3 

0.34 

0.36 

0.37 

0.38 

0.39 

0.40 

0.41 

0.42 

0.44 

0.45 

4 

0.46 

0.47 

0.48 

0.49 

0.50 

0.52 

0.53 

0.54 

0.55 

0.56 

5 

0.57 

0.58 

0.60 

0.61 

0.62 

0.63 

0.64 

0.65 

0.66 

0.68 

6 

0.69 

0.70 

0.71 

0.72 

0.73 

0.74 

0.76 

0.77 

0.78 

0.79 

7 

0.80 

0.81 

0.83 

0.84 

0.85 

0.86 

0.87 

0.88 

0.89 

0.91 

8 

0.92 

0.93 

0.94 

0.95 

0.96 

0.97 

0.99 

1.00 

1.01 

1.02 

9 

1.03 

1.04 

.05 

1.07 

1.08 

1.09 

1.10 

1.11 

1.12 

1.13 

10 

1.15 

1.16 

.17 

1.18 

1.19 

1.20 

1.21 

1.23 

1.24 

1.25 

11 

.26 

1.27 

.28 

1.29 

1.31 

1.32 

1.33 

1.34 

1.35 

1.36 

12 

.38 

1.39 

.40 

1.41 

1.42 

1.43 

1.44 

1.46 

1.47 

1.48 

13 

.49 

1.50 

.51 

1.52 

1.54 

1.55 

1.56 

1.57 

1.58 

1.59 

14 

.60 

1.62 

.63 

1.64 

1.65 

1.66 

1.67 

1.68 

1.70 

1.71 

15 

.72 

1.73 

.74 

1.75 

1.76 

1.78 

1.79 

1.80 

1.81 

1.82 

16 

.83 

1.84 

1.86 

1.87 

1.88 

1.89 

1.90 

1.91 

1.93 

1.94 

17 

.95 

1.96 

1.97 

1.98 

1.99k 

2.01 

2.02 

2.03 

2.04 

2.05 

18 

2.06 

2.07 

2.09 

2,10 

2.11* 

2.12 

2.13 

2.14 

2.15 

2.17 

19 

2.18 

2.19 

2.20 

2.21 

2.22 

2.23 

2.25 

2.26 

2.27 

2.28 

20 

2.29 

2.30 

2.31 

2.33 

2.34 

2.35 

2.36 

2.37 

2.38 

2.40 

21 

2.41 

2.42 

2.43 

2.44 

2.45 

2.46 

2.48 

2.49 

2.50 

2.51 

22 

2.52 

2.53 

2.54 

2.56 

2.57 

2.58 

2.59 

2.60 

2.61 

2.62 

23 

2.64 

2.65 

2.66 

2.67 

2.68 

2.69 

2.70 

2.72 

2.73 

2.74 

24 

2.75 

2.76 

2.77 

2.78 

2.80 

2.81 

2.82 

2.83 

2.84 

2.85 

25 

2.86 

2.88 

2.89 

2.90 

2.91 

2.92 

2.93 

2.95 

2.96 

2.97 

26 

2.98 

2.99 

3.00 

3.01 

3.03 

3.04 

3.05 

3.06 

3.07 

3.08 

27 

3.09 

3.11 

3.12 

3.13 

3.14 

3.15 

3.16 

3.17 

3.19 

3.20 

28 

3.21 

3.22 

3.23 

3.24 

3.25 

3.27 

3.28 

3.29 

3.30 

3.31 

29 

3.32 

3.33 

3.35 

3.36 

3.37 

3.38 

3.39 

3.40 

3.41 

3.43 

30 

3.44 

3.45 

3.46 

3.47 

3.48 

3.50 

3.51 

3.52 

3.53 

3.54 

31 

3.55 

3.56 

3.58 

3.59 

3.60 

3.61 

3.62 

3.63 

3.64 

3.66 

32 

3.67 

3.68 

3.69 

3.70 

3.71 

3.72 

3.74 

3.75 

3.76 

3.77 

33 

3.78 

3.79 

3.80 

3.82 

3.83 

3.84 

3.85 

3.86 

3.87 

3.88 

34 

3.90 

3.91 

3.92 

3.93 

3.94 

3.95 

3.96 

3.98 

3.99 

4.00 

35 

4.01 

4.02 

4.03 

4.05 

4.06 

4.07 

4.08 

4.09 

4.10 

4.11 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

c 


103 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING   POINT. 


Centi- 
grade 
Degrees. 

BAROMETER  :  715mm  (from  712.51  to  717.50). 

Tenths  of  Degrees. 

0. 

1. 

Millim. 
0.01 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

0 

Millim. 
0.00 

Millim. 
0.02 

Millim. 
0.04 

Millim. 
0.05 

Millim. 
0.06 

Millim. 
0.07 

Millim. 
0.08 

Millim. 
0.09 

Millim. 
0.10 

1 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.18 

0.20 

0.21 

0.22 

2 

0.23 

0.24 

0.25 

0.27 

0.28 

0.29 

0.30 

0.31 

0.32 

0.33 

3 

0.35 

0.36 

0.37 

0.38 

0.39 

0.40 

0.42 

0.43 

0.44 

0.45 

4 

0.46 

0.47 

0.48 

0.50 

0.51 

0.52 

0.53 

0.54 

0.55 

0.57 

5 

0.58 

0.59 

0.60 

0.61 

0.62 

0.63 

0.65 

0.66 

0.67 

0.68 

6 

0.69 

0.70 

0.72 

0.73 

0.74 

0.75 

0.76 

0.77 

0.78 

0.80 

7 

0.81 

0.82 

0.83 

0.84 

0.85 

0.87 

0.88 

0.89 

0.90 

0.91 

8 

0.92 

0.93 

0.95 

0.96 

0.97 

0.98 

0.99 

1.00 

1.02 

1.03 

9 

1.04 

1.05 

1.06 

1.07 

1.08 

1.10 

1.11 

.12 

1.13 

1.14 

10 

1.15 

1.17 

1.18 

1.19 

1.20 

1.21 

1.22 

.23 

1.25 

1.26 

11 

.27 

1.28 

1.29 

1.30 

1.32 

.33 

.34 

.35 

1.36 

1.37 

12 

.38 

1.40 

1.41 

1.42 

1.43 

.44 

.45 

.47 

1.48 

1.49 

13 

.50 

1.51 

1.52 

1.53 

1.55 

.56 

.57 

.58 

1.59 

1.60 

14 

.62 

1.63 

1.64 

1.65 

1.66 

.67 

.68 

.70 

1.71 

1.72 

15 

.73 

1.74 

1.75 

1.77 

1.78 

.79 

.80 

.81 

1.82 

1.83 

16 

1.85 

1.86 

1.87 

1.88 

1.89 

1.90 

1.92 

1.93 

1.94 

1.95 

17 
18 

1.96 
2.08 

1.97 

2.09 

1.98 
2.10 

2.00 
2.11 

2.01 
2.12 

2.02 
2.13 

2.03 
2.15 

2.04 
2.16 

2.05 
2.17 

2.07 
2.18 

19 

2.19 

2.20 

2.22 

2.23 

2.24 

2.25 

2.26 

2.27 

2.28 

2.30 

20 

2.31 

2.32 

2.33 

2.34 

2.35 

2.37 

2.38 

2.39 

2.40 

2.41 

21 

2.42 

2.43 

2.45 

2.46 

2.47 

2.48 

2.49 

2.50 

2.52 

2.53 

22 

2.54 

2.55 

2.56 

2.57 

2.58 

2.60 

2.61 

2.62 

2.63 

2.64 

23 

2.65 

2.67 

2.68 

2.69 

2.70 

2.71 

2.72 

2.74 

2.75 

2.76 

24 

2.77 

2.78 

2.79 

2.80 

2.82 

2.83 

2.84 

2.85 

2.86 

2.87 

25 

2.89 

2.90 

2.91 

2.92 

2.93 

2.94 

2.95 

2.97 

2.98 

2.99 

26 

3.00 

3.01 

3.02 

3.04 

3.05 

3.06 

3.07 

3.08 

3.09 

3.10 

27 

3.12 

3.13 

3.14 

3.15 

3.16 

3.17 

3.19 

3.20 

3.21 

3.22 

28 

3.23 

3.24 

3.25 

3.27 

3.28 

3.29 

3.30 

3.31 

3.32 

3.34 

29 

3.35 

3.36 

3.37 

3.38 

3.39 

3.40 

3.42 

3.43 

3.44 

3.45 

30 

3.46 

3.47 

3.49 

3.50 

3.51 

3.52 

3.53 

3.54 

3.55 

3.57 

31 

3.58 

3.59 

3.60 

3.61 

3.62 

3.64 

3.65 

3.66 

3.67 

3.68 

32 

3.69 

3.70 

3.72 

3.73 

3.74 

3.75 

3.76 

3.77 

3.79 

3.80 

33 

3.81 

3.82 

3.83 

3.84 

3.85 

3.87 

3.88 

3.89 

3.90 

3.91 

34 

3.92 

3.94 

3.95 

3.96 

3.97 

3.98 

3.99 

4.00 

4.02 

4.03 

35 

4.04 

4.05 

4.06 

4.07 

4.09 

4.10 

4.11 

4.12 

4.13 

4.14 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

S. 

0. 

104 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


24 


Centi- 
grade 
Degrees. 

BAROMETER  :  720mm  (from  717.51  to  722.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

V. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.03 

0.05 

0.06 

0.07 

0.08 

0.09 

0.10 

1 

0.12 

0.13 

0.14 

0.15 

0.16 

0.17 

0.19 

0.20 

0.21 

0.22 

2 

0.23 

0.24 

0.26 

0.27 

0.28 

0.29 

0.30 

0.31 

0.33 

0.34 

3 

0.35 

0.36 

0.37 

0.38 

0.40 

0.41 

0.42 

0.43 

0.44 

0.45 

4 

0.46 

0.48 

0.49 

0.50 

0.51 

0.52 

0.53 

0.55 

0.56 

0.57 

5 

0.58 

0.59 

0.60 

0.62 

0.63 

0.64 

0.65 

0.66 

0.67 

0.69 

6 

0.70 

0.71 

0.72 

0.73 

0.74 

0.76 

0.77 

0.78 

0.79 

0.80 

7 

0.81 

0.83 

0.84 

0.85 

0.86 

0.87 

0.88 

0.89 

0.91 

0.92 

8 

0.93 

0.94 

0.95 

0.96 

0.98 

0.99 

1.00 

1.01 

.02 

1.03 

9 

1.05 

1.06 

1.07 

.08 

1.09 

.10 

1.12 

1.13 

.14 

1.15 

10 

1.16 

1.17 

1.19 

.20 

1.21 

.22 

1.23 

1.24 

.26 

1.27 

11 

1.28 

1.29 

1.30 

.31 

1.32 

.34 

1.35 

1.36 

.37 

1.38 

12 

1.39 

1.41 

1.42 

.43 

1.44 

.45 

1.46 

1.48 

.49 

1.50 

13 

1.51 

1.52 

1.53 

.55 

1.56 

.57 

1.58 

1.59 

.60 

1.62 

14 

1.63 

1.64 

1.65 

.66 

1.67 

.69 

1.70 

1.71 

.72 

1.73 

15 

1.74 

1.75 

1.77 

.78 

1.79 

.80 

1.81 

1.82 

.84 

1.85 

16 

1.86 

1.87 

1.88 

1.89 

1.91 

1.92 

1.93 

1.94 

1.95 

1.96 

17 

1.98 

1.99 

2.00 

2.01 

2.02 

2.03 

2.05 

2.06 

2.07 

2.08 

18 

2.09 

2.10 

2.11 

2.13 

2.14 

2.15 

2.16 

2.17 

2.18 

2.20 

19 

2.21 

2.22 

2.23 

2.24 

2.25 

2.27 

2.28 

2.29 

2.30 

2.31 

20 

2.32 

2.34 

2.35 

2.36 

2.37 

2.38 

2.39 

2.41 

2.42 

2.43 

21 

2.44 

2.45 

2.46 

2.48 

2.49 

2.50 

2.51 

2.52 

2.53 

2.54 

22 

2.56 

2.57 

2.58 

2.59 

2.60 

2.61 

2.63 

2.64 

2.65 

2.66 

23 

2.67 

2.68 

2.70 

2.71 

2.72 

2.73 

2-74 

2.75 

2.77 

2.78 

24 

2.79 

2.80 

2.81 

2.82 

2.84 

2.85 

2-86 

2.87 

2.88 

2.89 

25 

2.91 

2.92 

2.93 

2.94 

2.95 

2.96 

2.97 

2.99 

3.00 

3.01 

26 

3.02 

3.03 

3.04 

3.06 

3.07 

3.08 

3-09 

3.10 

3.11 

3.13 

27 

3.14 

3.15 

3.16 

3.17 

3.18 

3.20 

3-21 

3.22 

3.23 

3.24 

28 

3.25 

3.27 

3.28 

3.29 

3.30 

3.31 

3-32 

3.34 

3.35 

3.36 

29 

3.37 

3.38 

3.39 

3.40 

3.42 

3.43 

3-44 

3.45 

3.46 

3.47 

30 

3.49 

3.50 

3.51 

3.52 

3.53 

3.54 

3.56 

3.57 

3.58 

3.59 

31 

3.60 

3.61 

3.63 

3.64 

3-65 

3.66 

3.67 

3.68 

3.70 

3.71 

32 

3.72 

3.73 

3.74 

3.75 

3.77 

3.78 

3.79 

3.80 

3.81 

3.82 

33 

3.83 

3.85 

3.86 

3.87 

3.88 

3.89 

3.90 

3.92 

3.93 

3.94 

34 

3.95 

3.96 

3.97 

3.99 

4.00 

4.01 

4.02 

4.03 

4.04 

4.06 

35 

4.07 

4.08 

4.09 

4.10 

4.11 

4.13 

4.14 

4.15 

4.16 

4.17 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

c 


105 


25 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING-   POINT. 


BAROMETER  :  725mm-  (from  722.51  to  727.50). 

Centi- 

grade 

Tenths  of  Degrees. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

0. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.04 

0.05 

0.06 

0.07 

0.08 

0.09 

0.11 

1 

0.12 

0.13 

0.14 

0.15 

0.16 

0.18 

0.19 

0.20 

0.21 

0.22 

2 

0.23 

0.25 

0.26 

0.27 

0.28 

0.29 

0.30 

0.32 

0.33 

0.34 

3 

0.35 

0.36 

0.37 

0.39 

0.40 

0.41 

0.42 

0.43 

0.44 

0.46 

4 

0.47 

0.48 

0.49 

0.50 

0.51 

0.53 

0.54 

0.55 

0.56 

0.57 

5 

0.59 

0.60 

0.61 

0.62 

0.63 

0.64 

0.66 

0.67 

0.68 

0.69 

6 

0.70 

0.71 

0.73 

0.74 

0.75 

0.76 

0.77 

0.78 

0.80 

0.81 

7 

0.82 

0.83 

0.84 

0.85 

0.87 

0.88 

0.89 

0.90 

0.91 

0.92 

8 

0.94 

0.95 

0.96 

0.97 

0.98 

0.99 

1.01 

1.02 

1.03 

1.04 

9 

1.05 

1.06 

1.08 

1.09 

1.10 

.11 

1.12 

1.14 

1.15 

1.16 

10 

1.17 

1.18 

1.19 

1.21 

1.22 

.23 

1.24 

1.25 

1.26 

1.28 

11 

1.29 

.30 

1.31 

1.32 

1.33 

.35 

1.36 

1.37 

1.38 

1.39 

12 

1.40 

.42 

1.43 

1.44 

1.45 

.46 

1.47 

1.49 

1.50 

1.51 

13 

1.52 

.53 

1.54 

1.56 

1.57 

.58 

1.59 

1.60 

1.61 

1.63 

14 

1.64 

.65 

1.66 

1.67 

1.69 

.70 

1.71 

1.72 

1.73 

1.74 

15 

1.76 

.77 

1.78 

1.79 

1.80 

1.81 

1.83 

1.84 

1.85 

1.86 

16 

1.87 

1.88 

1.90 

1.91 

1.92 

1.93 

1.94 

1.95 

1.97 

1.98 

17 

1.99 

2.00 

2.01 

2.02 

2.04 

2.05 

2.06 

2.07 

2.08 

2.09 

18 

2.11 

2.12 

2.13 

2.14 

2.15 

2.16 

2.18 

2.19 

2.20 

2.21 

19 

2.22 

2.23 

2.25 

2.26 

2.27 

2.28 

2.29 

2.31 

2.32 

2.33 

20 

2.34 

2.35 

2.36 

2.38 

2.39 

2.40 

2.41 

2.42 

2.43 

2.45 

21 

2.46 

2.47 

2.48 

2.49 

2.50 

2.52 

2.53 

2.54 

2.55 

2.56 

22 

2.57 

2.59 

2.60 

2.61 

2.62 

2.63 

2.64 

2.66 

2.67 

2.68 

23 

2.69 

2.70 

2.71 

2.73 

2.74 

2.75 

2.76 

2.77 

2.78 

2.80 

24 

2.81 

2.82 

2.83 

2.84 

2.86 

2.87 

2.88 

2.89 

2.90 

2.91 

25 

2.93 

2.94 

2.95 

2.96 

2.97 

2.98 

3.00 

3.01 

3.02 

3.03 

26 

3.04 

3.05 

3.07 

3.08 

3.09 

3.10 

3.11 

3.12 

3.14 

3.15 

27 

3.16 

3.17 

3.18 

3.19 

3.21 

3.22 

3.23 

3.24 

3.25 

3.26 

28 

3.28 

3.29 

3.30 

3.31 

3.32 

3.33 

3.35 

3.36 

3.37 

3.38 

29 

3.39 

3.41 

3.42 

3.43 

3.44 

3.45 

3.46 

3.48 

3.49 

3.50 

30 

3.51 

3.52 

3.53 

3.55 

3.56 

3.57 

3.58 

3.59 

3.60 

3.62 

31 

3.63 

3.64 

3.65 

3.66 

3.67 

3.69 

3.70 

3.71 

3.72 

3.73 

32 

3.74 

3.76 

3.77 

3.78 

3.79 

3.80 

3.81 

3.83 

3.84 

3.85 

33 

3.86 

3.87 

3.88 

3.90 

3.91 

3.92 

3.93 

3.94 

3.96 

3.97 

34 

3.98 

3.99 

4.00 

4.01 

4.03 

4.04 

4.05 

4.06 

4.07 

4.08 

35 

4.10 

4.11 

4.12 

4.13 

4.14 

4.15 

4.17 

4.18 

4.19 

4.20 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

106 


REDUCTION    OF   THE    BAROMETER    TO    THE    FREEZING    POINT. 


26 


Centi- 
grade 
Degrees. 

BAROMETER  :  730mm-  (from  727.51  to  732.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 
0 

Millim. 
0.00 

Millim. 
0.01 

Millim. 
0.02 

M  Him. 
0.04 

Millim. 
0.05 

M  Him. 
0.06 

Millim. 
0.07 

Millim. 
0.08 

Millim. 
0.09 

Millim. 
0.11 

1 

0.12 

0.13 

0.14 

0.15 

0.16 

0.18 

0.19 

0.20 

0.21 

0.22 

2 

0.24 

0.25 

0.26 

0.27 

0.28 

0.29 

0.31 

0.32 

0.33 

0.34 

3 

0.35 

0.37 

0.38 

0.39 

0.40 

0.41 

0.42 

0.44 

0.45 

0.46 

4 

0.47 

0.4S 

0.49 

0.51 

0.52 

0.53 

0.54 

0.55 

0.57 

0.58 

5 

0.59 

0.60 

0.61 

0.62 

0.64 

0.65 

0.66 

0.67 

0.68 

0.70 

6 

0.71 

0.72 

0.73 

0.74 

0.75 

0.77 

0.78 

0.79 

0.80 

0.81 

7 

0.82 

0.84 

0.85 

0.86 

0.87 

0.88 

0.90 

0.91 

0.92 

0.93 

8 

0.94 

0.95 

0.97 

0.98 

0.99 

.00 

1.01 

.03 

1.04 

1.05 

9 

1.06 

.07 

l.OS 

.10 

1.11 

.12 

1.13 

.14 

1.15 

1.17 

10 

1.18 

.19 

1.20 

.21 

1.23 

.24 

1.25 

.26 

1.27 

1.28 

11 

1.30 

.31 

1.32 

.33 

1.34 

.35 

1.37 

.38 

1.39 

.40 

12 

1.41 

.43 

1.44 

.45 

1.46 

.47 

1.48 

.50 

1.51 

.52 

13 

1.53 

.54 

1.56 

.57 

1.58 

.59 

1.60 

.61 

1.63 

.64 

14 

1.65 

.66 

1.67 

.68 

1.70 

.71 

1.72 

.73 

1.74 

.76 

15 

1.77 

.78 

1.79 

.80 

1.81 

.83 

1.84 

.85 

1.86 

.87 

16 

1.89 

1.90 

1.91 

1.92 

1.93 

1.94 

1.96 

1.97 

1.98 

1.99 

17 

2.00 

2.01 

2.03 

2.04 

2.05 

2.06 

2.07 

2.09 

2.10 

2.11 

18 

2.12 

2.13 

2.14 

2.16 

2.17 

2.18 

2.19 

2.20 

2.22 

2.23 

19 

2.24 

2.25 

2.26 

2.27 

2.29 

2.30 

2.31 

2.32 

2.33 

2.34 

20 

2.36 

2.37 

2.38 

2.39 

2.40 

2.42 

2.43 

2.44 

2.45 

2.46 

21 

2.47 

2.49 

2.50 

2.51 

2.52 

2.53 

2.54 

2.56 

2.57 

2.58 

22 

2.59 

2.60 

2.62 

2.63 

2.64 

2.65 

2.66 

2.67 

2.69 

2.70 

23 

2.71 

2.72 

2.73 

2.75 

2.76 

2.77 

2.78 

2.79 

2.80 

2.82 

24 

2.83 

2.84 

2.85 

2.86 

2.87 

2.89 

2.90 

2.91 

2.92 

2.93 

25 

2.95 

2.96 

2.97 

2.98 

2.99 

3.01 

3.02 

3.03 

3.04 

3.05 

26 

3.06 

3.08 

3.09 

3.10 

3.11 

3.12 

3.13 

3.15 

3.16 

3.17 

27 

3.18 

3.19 

3.20 

3.22 

3.23 

3.24 

3.25 

3.26 

3.28 

3.29 

28 

3.30 

3.31 

3.32 

3.33 

3.35 

3.36 

3.37 

3.38 

3.39 

3.41 

29 

3.42 

3.43 

3.44 

3.45 

3.46 

3.48 

3.49 

3.50 

3.51 

3.52 

30 

3.53 

3.55 

3.56 

3.57 

3.58 

3.59 

3.61 

3.62 

3.63 

3.64 

31 

3.65 

3.66 

3.68 

3.69 

3.70 

3.71 

3.72 

3.73 

3.75 

3.76 

32 

3.77 

3.78 

3.79 

3.81 

3.82 

3.83 

3.84 

3.85 

3.86 

3.88 

33 

3.89 

3.90 

3.91 

3.92 

3.94 

3.95 

3.96 

3.97 

3.98 

3.99 

34 

4.01 

4.02 

4.03 

4.04 

4.05 

4.06 

4.07 

4.09 

4.10 

4.11 

35 

4.12 

4.14 

4.15 

4.16 

4.17 

4.18 

4.19 

4.21 

4.22 

4.23 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

107 


27 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


BAROMETER  :  735mm-  (from  732.51  to  737.50). 

Centi- 

grade 

Tenths  of  Degrees. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.04 

0.05 

0.06 

0.07 

0.08 

0.09 

0.11 

1 

0.12 

0.13 

0.14 

0.15 

0.17 

0.18 

0.19 

0.20 

0.21 

0.23 

2 

0.24 

0.25 

0.26 

0.27 

0.28 

0.30 

0.31 

0.32 

0.33 

0.34 

3. 

0.36 

0.37 

0.38 

0.39 

0.40 

0.42 

0.43 

0.44 

0.45 

0.46 

4 

0.47 

0.49 

0.50 

0.51 

0.52 

0.53 

0.55 

0.56 

0.57 

0.58 

5 

0.59 

0.61 

0.62 

0.63 

0.64 

0.65 

0.66 

0.68 

0.69 

0.70 

6 

0.71 

0.72 

0.74 

0.75 

0.76 

0.77 

0.78 

0.79 

0.81 

0.82 

7 

0.83 

0.84 

0.85 

0.87 

0.88 

0.89 

0.90 

0.91 

0.93 

0.94 

8 

0.95 

0.96 

0.97 

0.98 

.00 

1.01 

.02 

1.03 

1.04 

1.06 

9 

1.07 

1.08 

1.09 

.10 

.12 

1.13 

.14 

1.15 

1.16 

1.17 

10 

1.19 

1.20 

1.21 

.22 

.23 

1.25 

.26 

1.27 

1.28 

1.29 

11 

1.30 

1.32 

1.33 

.34 

.35 

1.36 

.37 

.39 

1.40 

1.41 

12 

1.42 

1.44 

1.45 

.46 

.47 

1.48 

.49 

.51 

1.52 

1.53 

13 

1.54 

1.55 

1.57 

.58 

.59 

1.60 

.61 

.63 

1.64 

1.65 

14 

1.66 

1.67 

1.69 

.70 

.71 

1.72 

.73 

.74 

1.76 

1.77 

15 

1.78 

1.79 

1.80 

.82 

1.83 

1.84 

.85 

.86 

1.87 

1.89 

16 

1.90 

1.91 

1.92 

1.93 

1.95 

1.96 

1.97 

1.98 

1.99 

2.00 

17 

2.02 

2.03 

2.04 

2.05 

2.06 

2.08 

2.09 

2.10 

2.11 

2.12 

18 

2.14 

2.15 

2.16 

2.17 

2.18 

2.19 

2.21 

2.22 

2.23 

2.24 

19 

2.25 

2.27 

2.28 

2.29 

2.30 

2.31 

2.33 

2.34 

2.35 

2.36 

20 

2.37 

2.38 

2.40 

2.41 

2.42 

2.43 

2.44 

2.46 

*  2.47 

2.48 

21 

2.49 

2.50 

2.51 

2.53 

2.54 

2.55 

2.56 

2-57 

2.59 

2.60 

22 

2.61 

2.62 

2.63 

2.65 

2.66 

2.67  , 

2.68 

2.69 

2.70 

2.72 

23 

2.73 

2.74 

2.75 

2.76 

2.78 

2.79 

2.80 

2.81 

2.82 

2.84 

24 

2.85 

2.86 

2.87 

2.88 

2.89 

2.91 

2.92 

2.93 

2.94 

2.95 

25 

2.97 

2.98 

2.99  ' 

3.00 

3.01 

3.03 

3.04 

3.05 

3.06 

3.07 

26 

3.08 

3.10 

3.11 

3.12 

3.13 

3.14 

3.16 

3-17 

3.18 

3.19 

27 

3.20 

3.21 

3.23 

3.24 

3.25 

3.26 

3.27 

3.29 

3.30 

3.31 

28 

3.32 

3.33 

3.35 

3.36 

3.37 

3.38 

3.39 

3.40 

3.42 

3.43 

29 

3.44 

3.45 

3.46 

3.48 

3.49 

3.50 

3.51 

3.52 

3.54 

3.55 

30 

3.56 

3.57 

3.58 

3.59 

3.61 

3.62 

3.63 

3.64 

3.65 

3.67 

31 

3.68 

3.69 

3.70 

3.71 

3.72 

3.74 

3.75 

3-76 

3.77 

3.78 

32 

3.80 

3.81 

3.82 

3.83 

3.84 

3.86 

3.87 

3.88 

3.89 

3.90 

33 

3.91 

3.93 

3.94 

3.95 

3.96 

3.97 

3.99 

4.00 

4.01 

4.02 

34 

4.03 

3.05 

4.06 

4.07 

4.08 

4.09 

4.10 

4.12 

4.13 

4.14 

35 

4.15 

4.16 

4.18 

4.19 

4.20 

4.21 

4.22 

4.24 

4.25 

4.26 

0. 

1.           2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

108 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


BAROMETER  :  740rara-  (from  737.51  to  742.50). 

Centi- 
grade 

Tenths  of  Degrees. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.04 

0.05 

0.06 

0.07 

0.08 

0.09 

0.11 

1 

0.12 

0.13 

0.14 

0.16 

0.17 

0.18 

0.19 

0.20 

0.21 

0.23 

2 

0.24 

0.25 

0.26 

0.27 

0.29 

0.30 

0.31 

0.32 

0.33 

0.35 

3 

0.36 

0.37 

0.38 

0.39 

0.41 

0.42 

0.43 

0.44 

0.45 

0.47 

4 

0.48 

0.49 

0.50 

0.51 

0.53 

0.54 

0.55 

0.56   ' 

0.57 

0.59 

5 

0.60 

0.61 

0.62 

0.63 

0.64 

0.66 

0.67 

0.68 

0.69 

0.70 

6 

0.72 

0.73 

0.74 

0.75 

0.76 

0.78 

0.79 

0.80 

0.81 

0.82 

7 

0.84 

0.85 

0.86 

0.87 

0.88 

0.90 

0.91 

0.92 

0.93 

0.94 

8 

0.96 

0.97 

0.98 

0.99 

1.00 

1.02 

1.03 

1.04 

1.05 

1.06 

9 

.07 

1.09 

.10 

.11 

1.12 

.13 

1.15 

1.16 

1.17 

1.18 

10 

.19 

1.21 

.22 

.23 

1.24 

.25 

1.27 

1.28 

1.29 

1.30 

11 

.31 

1.33 

.34 

.35 

1.36 

.37 

1.39 

.40 

1.41 

1.42 

12 

.43 

1.45 

.46 

.47 

1.48 

.49 

1.50 

.52 

1.53 

1.54 

13 

.55 

1.56 

.58 

.59 

1.60 

.61 

1.62. 

.64 

1.65 

1.66 

14 

.67 

1.68 

.70 

.71 

1.72 

.73 

1.74 

.76 

1.77 

1.78 

15 

.79 

1.80 

.82 

1.83 

1.84 

1.85 

1.86 

.88 

1.89 

1.90 

16 

1.91 

1.92 

1.93 

1.95 

1.96 

1.97 

1.98 

1.99 

2.01 

2.02 

17 

2.03 

2.04 

2.05 

2.07 

2.08 

2.09 

2.10 

2.11 

2.13 

2.14 

18 

2.15 

2.16 

2.17 

2.19 

2.20 

2.21 

2.22 

2.23 

2.25 

2.26 

19 

2.27 

2.28 

2.29 

2.31 

2.32 

2.33 

2.34 

2.35 

2.36 

2.38 

20 

2.39 

2.40 

2.41 

2.42 

2.44 

2.45 

2.46 

2.47 

2.48 

2.50 

21 

2.51 

2.52 

2.53 

2.54 

2.56 

2.57 

2.58 

2.59 

2.60 

2.62 

22 

2.63 

2.64 

2.65 

2.66 

2.68 

2.69 

2.70 

2.71 

2.72 

2.74 

23 

2.75 

2.76 

2.77 

2.78 

2.79 

2.81 

2.82 

2.83 

2.84 

2.85 

24 

2.87 

2.88 

2.89 

2.90 

2.91 

2.93 

2.94 

2.95 

2.96 

2.97 

25 

2.99 

3.00 

3.01 

3.02 

3.03 

3.05 

3.06 

3.07 

3.08 

3.09 

26 

3.11 

3.12 

3.13 

3.14 

3.15 

3.17 

3.18 

3.19 

3.20 

3.21 

27 

3.22 

3.24 

3.25 

3.26 

3.27 

3.28 

3.30 

3.31 

3.32 

3.33 

28 

3.34 

3.36 

3.37 

3.38 

3.39 

3.40 

3.42 

3.43 

3.44 

3.45 

29 

3.46 

3.48 

3.49 

3.50 

3.51 

3.52 

3.54 

3.55 

3.56 

3.57 

30 

3.58 

3.60 

3.61 

3.62 

3.63 

3.64 

3.65 

3.67 

3.68 

3.69 

31 

3.70 

3.71 

3.73 

3.74 

3.75 

3.76 

3.77 

3.79 

3.80 

3.81 

32 

3.82 

3.83 

3.85 

3.86 

3.87 

3.88 

3.89 

3.91 

3.92 

3.93 

33 

3.94 

3.95 

3.97 

3.98 

3.99 

4.00 

4.01 

4.02 

4.04 

4.05 

34 

4.06 

4.07 

4.08 

4.10 

4.11 

4.12 

4.13 

4.14 

4.16 

4.17 

35 

4.18 

4.19 

4.20 

4.22 

4.23 

4.24 

4.25 

4.26 

4.28 

4.29 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

c 


109 


SEDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING   POINT. 


BAROMETER  :  745mm-  (from  742.51  to  747.50). 

Centi- 
grade 
Degrees. 

Tenths  of  Degrees. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02- 

0.04 

0.05 

0.06 

0.07 

0.08 

0.10 

0.11 

1 

0.12 

0.13 

0.14 

0.16 

0.17 

0.18 

0.19 

0.20 

0.22 

0.23 

2 

0.24 

0.25 

0.26 

0.28 

0.29 

0.30 

0.31 

0.32 

0.34 

0,35 

3 

0.36 

0.37 

0.38 

0.40 

0.41 

0.42 

0.43 

0.44 

0.46 

0.47 

4 

0.48 

'0.49 

0.51 

0.52 

0.53 

0.54 

0.55 

0.57 

0.58 

0.59 

5 

0.60 

0.61 

0.63 

0.64 

0.65 

0.66 

0.67 

0.69 

0.70 

0.71 

6 

0.72 

0.73 

0.75 

0.76 

0.77 

0.78 

0.79 

0.81 

0.82 

0.83 

7 

0.84 

0.85 

0.87 

0.88 

0.89 

0.90 

0.91 

0.93 

0.94 

0.95 

8 

0.96 

0.97 

0.99 

.00 

1.01 

1.02 

.03 

1.05 

1.06 

1.07 

9 

1.08 

.09 

1.11 

.12 

1.13 

1.14 

.15 

1.17 

1.18 

1.19 

10 

1.20 

.21 

1.23 

.24 

1.25 

1.26 

.27 

1.29 

1.30 

1.31 

11 

.32 

.33 

1.35 

.36 

.37 

1.38 

.39 

1.41 

1.42 

1.43 

12 

.44 

.45 

1.47 

.48 

.49 

1.50 

.52 

1.53 

1.54 

1.55 

13 

.56 

.58 

1.59 

.60 

.61 

1.62 

.64 

1.65 

1.66 

1.67 

14 

.68 

.70 

1.71 

.72 

.73 

1.74 

.76 

1.77 

1.78 

1.79 

15 

.80 

.82 

1.83 

1.84 

.85 

1.86 

1.88 

1.89 

1.90 

1.91 

16 

1.92 

1.94 

1.95 

1.96 

1.97 

1.98 

2.00 

2.01 

2.02 

2.03 

17 

2.04 

2.06 

2.07 

2.08 

2.09 

2.10 

2.12 

2.13 

2.14 

2.15 

18 

2.16 

2.18 

2.19 

2.20 

2.21 

2.22 

2.24 

2.25 

2.26 

2.27 

19 

2.28 

2.30 

2.31 

2.32 

2.33 

2.34 

2.36 

2.37 

2.38 

2.39 

20 

2.40 

2.42 

2.43 

2.44 

2.45 

2.46 

2.48 

2.49 

2.50 

2.51 

21 

2.53 

2.54 

2.55 

2.56 

2.57 

2.59 

2.60 

2.61 

2.62 

2.63 

22 

2.65 

2.66 

2.67 

2.68 

2.69 

2.71 

2.72 

2.73 

2.74 

2.75 

23 

2.77 

2.78 

2.79 

2.80 

2.81 

2.83 

2.84 

2.85 

2.86 

2.87 

24 

2.89 

2.90 

2.91 

2.92 

2.93 

2.95 

2.96 

2.97 

2.98 

2.99 

25 

3.01 

3.02 

3.03 

3.04 

3.05 

3.07 

3.08 

3.09 

3.10 

3.11 

26 

3.13 

3.14 

3.15 

3.16 

3.17 

3.19 

3.20 

3.21 

3.22 

3.23 

27 

3.25 

3.26 

3.27 

3.28 

3.29 

3.31 

3.32 

3.33 

3.34 

3.35 

28 

3.37 

3.38 

3.39 

3.40 

3.41 

3.43 

3.44 

3.45 

3.46 

3.48 

29 

3.49 

3.50 

3.51 

3.52 

3.54 

3.55 

3.56 

3.57 

3.58 

3.60 

.30 

3.61 

3.62 

3.63 

3.64 

3.66 

3.67 

3.68 

3.69 

3.70 

3.72 

31 

3.73 

3.74 

3.75 

3.76 

3.78 

3.79 

3.80 

3.81 

3.82 

3.84 

32 

3.85 

3.86 

3.87 

3.88 

3.90 

3.91 

3.92 

3.93 

3.94 

3.96 

33 

3.97 

3.98 

3.99 

4.00 

4.02 

4.03 

4.04 

4.05 

4.06 

4.08 

34 

4.09 

4.10 

4.11 

4.12 

4.14 

4.15 

4.16 

4.17 

4.18 

4.20 

35 

4.21 

4.22 

4.23 

4.24 

4.26 

4.27 

4.28 

4.29 

4.30 

4.32 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

8. 

9. 

1 

110 


REDUCTION    OF    THE    BAROMETER   TO    THE    FREEZING   POINT. 


30 


Centi- 
grade 
Degrees. 

BAROMETER  :  750mm-  (from  747.51  to  752.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.04 

0.05 

0.06 

0.07 

0.08 

0.10 

0.11 

1 

0.12 

0.13 

0.15 

0.16 

0.17 

0.18 

0.19 

0.21 

0.22 

0.23 

2 

0.24 

0.25 

0.27 

0.28 

0.29 

0.30 

0.31 

0.33 

0.34 

0.35 

3 

0.36 

0.38 

0.39 

0.40 

0.41 

0.42 

0.44 

0.45 

0.46 

0.47 

4 

0.48 

0.50 

0.51 

0.52 

0.53 

0.55 

0.56 

0.57 

0.58 

0.59 

5 

0.61 

0.62 

0.63 

0.64 

0.65 

0.67 

0.68 

0.69 

0.70 

0.71 

6 

0.73 

0.74 

0.75 

0.76 

0.77 

0.79 

0.80 

0.81 

0.82 

0.84 

7 

0.85 

0.86 

0.87 

0.88 

0.90 

0.91 

0.92 

0.93 

0.94 

0.96 

8 

0.97 

0.98 

0.99 

1.00 

1.02 

1.03 

1.04 

1.05 

1.07 

1.08 

9 

1.09 

1.10 

.11 

1.13 

1.14 

1.15 

1.16 

1.17 

1.19 

1.20 

10 

1.21 

1.22 

.23 

1.25 

1.26 

1.27 

1.28 

1.30 

1.31 

1.32 

11 

1.33 

1.34 

.36 

1.37 

1.38 

1.39 

1.40 

.42 

1.43 

1.44 

12 

1.45 

1.46 

.48 

1.49 

1.50 

1.51 

1.53 

.54 

1.55 

1.56 

13 

1.57 

1.59 

.60 

1.61 

1.62 

1.63 

1.65  ' 

.66 

1.67 

1.68 

14 

1.69 

1.71 

.72 

1.73 

1.74 

1.76 

1.77 

.78 

1.79 

1.80 

15 

1.82 

1.83 

.84 

1.85 

1.86 

1.88 

1.89 

.90 

1.91 

1.92 

16 

1.94 

1.95 

1.96 

1.97 

1.99 

2.00 

2.01 

2.02 

2.03 

2.05 

17 

2.06 

2.07 

2.08 

2.09 

2.11 

2.12 

2.13 

2.14 

2.15 

2.17 

18 

2.18 

2.19 

2.20 

2.21 

2.23 

2.24 

2.25 

2.26 

2.28 

2.29 

19 

2.30 

2.31 

2.32 

2.34 

2.35 

2.36 

2.37 

2.38 

2.40 

2.41 

20 

2.42 

2.43 

2.45 

2.46 

2.47 

2.48 

2.49 

2.51 

2.52 

2.53 

21 

2.54 

2.55 

2.57 

2.58 

2.59 

.2.60 

2.61 

2.63 

2.64 

2.65 

22 

2.66 

2.68 

2.69 

2.70 

2.71 

2.72 

2.73 

2.75 

2.76 

2.77 

23 

2.78 

2.80 

2.81 

2.82 

2.83 

2.84 

2.86 

2.87 

2.88 

2.89 

24 

2.91 

2.92 

2.93 

2.94 

2.95 

2.97 

2.98 

2.99 

3.00 

3.01 

25 

3.03 

3.04 

3.05 

3.06 

3.07 

3.09 

3.10 

3.11 

3.12 

3.14 

26 

3.15 

3.16 

3.17 

3.18 

3.20 

3.21 

3.22 

3.23 

3.24 

3.26 

27 

3.27 

3.28 

3.29 

3.30 

3.32 

3.33 

3.34 

3.35 

3.37 

3.38 

28 

3.39 

3.40 

3.41 

3.43 

3.44 

3.45 

3.46 

3.47 

3.49 

3.50 

29 

3.51 

3.52 

3.54 

3.55 

3.56 

3.57 

3.58 

3.60 

3.61 

3.62 

30 

3.63 

3.64 

3.66 

3.67 

3.68 

3.69 

3.70 

3.72 

3.73 

3.74 

31 

3.75 

3.76 

3.78 

3.79 

3.80 

3.81 

3.83 

3.84 

3.85 

3.86 

32 

3.87 

3.89 

3.90 

3.91 

3.92 

3.93 

3.95 

3.96 

3.97 

3.98 

33 

3.99 

4.01 

4.02 

4.03 

4.04 

4.06 

4.07 

4.08 

4.09 

4.10 

34 

4.12 

4,13 

4.14 

4.15 

4.16 

4.18 

4.19 

4.20 

4.21 

4.22 

35 

4.24 

4.25 

4.26 

4.27 

4.29 

4.30 

4.31 

4.32 

4.33 

4.35 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

<J                                                                         111 

31 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


Centi- 
grade 
Degrees. 

BAROMETER  :  755mm-  (from  752.51  to  757.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

0 

M  Him. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.04 

0.05 

0.06 

0.07 

0.09 

0.10 

0.11 

1 

0.12 

0.13 

0.15 

0.16 

0.17 

0.18 

0.19 

0.21 

0.22 

0.23 

2 

0.24 

0.26 

0.27 

0.28 

0.29 

0.30 

0.32 

0.33 

0.34 

0.35 

3 

0.37 

0.38 

0.39 

0.40 

0.41 

0.43 

0.44 

0.45 

0.46 

0.48 

4 

0.49 

0.50 

0.51 

0.52 

0.54 

0.55 

0.56 

0.57 

0.58 

0.60 

5 

0.61 

0.62 

0.63 

0.65 

0.66 

0.67 

0.68 

0.69 

0.71 

0.72 

6 

0.73 

0.74 

0.76 

0.77 

0.78 

0.79 

0.80 

0.82 

0.83 

0.84 

7 

0.85 

0.87 

0.88 

0.89 

0.90 

0.91 

0.93 

0.94 

0.95 

0.96 

8 

0.97 

0.99 

1.00 

.01 

1.02 

1.04 

1.05 

1.06 

1.07 

1.08 

9 

.10 

1.11 

1.12 

.13 

1.15 

1.16 

1.17 

1.18 

1.19 

1.21 

10 

.22 

1.23 

1.24 

.26 

1.27 

1.28 

1.29 

1.30 

1.32 

1.33 

11 

.34 

1.35 

1.36 

.38 

.39 

1.40 

.41 

1.43 

1.44 

1.45 

12 

.46 

1.47 

1.49 

.50 

.51 

1.52 

.54 

1.55 

1.56 

1.57 

13 

.58 

1.60 

1.61 

.62 

.63 

1.65 

.66 

1.67 

1.68 

1.69 

14 

.71 

1.72 

1.73 

.74 

.75 

1.77 

.78 

1.79 

1.80 

1.82 

15 

.83 

1.84 

1.85 

.86 

.88 

1.89 

.90 

1.91 

1.93 

1.94 

16 

1.95 

1.96 

1.97 

1.99 

2.00 

2.01 

2.02 

2.04 

2.05 

2.06 

17 

2.07 

2.08 

2.10 

2.11 

2.12 

2.13 

2.14 

2.16 

2.17 

2.18 

18 

2.19 

2.21 

2.22 

2.23 

2.24 

2.25 

2.27 

2.28 

2.29 

2.30 

19 

2.32 

2.33 

2.34 

2.35 

2.36 

2.38 

2.39 

2.40 

2.41 

2.42 

20 

2.44 

2.45 

2.46 

2.47 

2.49 

2.50 

2.51 

2.52 

2.53 

2.55 

21 

2.56 

2.57 

2.58 

2.60 

2.61 

2.62 

2.63 

2.64 

2.66 

2.67 

22 

2.68 

2.69 

2.71 

2.72    " 

2.73 

2.74 

2.75 

2.77 

2.78 

2.79 

23 

2.80 

2.81 

2.83 

2.84 

2.85 

2.86 

2.88 

2.89 

2.90 

2.91 

24 

2.92 

2.94 

2.95 

2.96 

2.97 

2.99 

3.00 

3.01 

3.02 

3.03 

25 

3.05 

3.06 

3.07 

3.08 

3.10 

3.11 

3.12 

3.13 

3.14 

3.16 

26 

3.17 

3.18 

3.19 

3.20 

3.22 

3.23 

3.24 

3.25 

3.27 

3.28 

27 

3.29 

3.30 

3.31 

3.33 

3.34 

3.35 

3.36 

3.38 

3.39 

3.40 

28 

3.41 

3.42 

3.44 

3.45 

3.46 

3.47 

3.49 

3.50 

3.51 

3.52 

29 

3.53 

3.55 

3.56 

3.57 

3.58 

3.59 

3.61 

3.62 

3.63 

3.64 

30 

3.66 

3.67 

3.68 

3.69 

3.70 

3.72 

3.73 

3.74 

3.75 

3.77 

31 

3.78 

3.79 

3.80 

3.81 

3.83 

3.84 

3.85 

3.86 

3.88 

3.89 

32 

3.90 

3.91 

3.92 

3.94 

3.95 

3.96 

3.97 

3.98 

4.00 

4.01 

33 

4.02 

4.03 

4.05 

4.06 

4.07 

4.08 

4.09 

4.11 

4.12 

4.13 

34 

4.14 

4.16 

4.17 

4.18 

4.19 

4.20 

4.22 

4.23 

4.24 

4.25 

35 

4.26 

4.28 

4.29 

4.30 

4.31 

4.33 

4.34 

4.35 

4.36 

4.37 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

112 


REDUCTION    OF   THE    BAROMETER   TO    THE   FREEZING    POINT. 


32 


BAROMETER  :  760ram-  (from  757.51  to  762.50). 

Centi- 
grade 

Tenths  of  Degrees. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.04 

0.05 

0.06 

0.07 

0.09 

0.10 

0.11 

1 

0.12 

0.13 

0.15 

0.16 

0,17 

0.18 

0.20 

0.21 

0.22 

0.23 

2 

0.25 

0.26 

0.27 

0.28 

0.29 

0.31 

0.32 

0.33 

0.34 

0.36 

3 

0.37 

0.38 

0.39 

0.40 

0.42 

0.43 

0.44 

0.45 

0.47 

0.48 

4 

0.49 

0.50 

0.52 

0.53 

0.54 

0.55 

0.56 

0.58 

0.59 

0.60 

5 

0.61 

0.63 

0.64 

0.65 

0.66 

0.67 

0.69 

0.70 

0.71 

0.72 

6 

0.74 

0.75 

0.76 

0.77 

0.79 

0.80 

0.81 

0.82 

0.83 

0.85 

7 

0.86 

0.87 

0.88 

0.90 

0.91 

0.92 

0.93 

0.94 

0.96 

0.97 

8 

0.98 

0.99 

1.01 

.02 

1.03 

1.04 

1.05 

1.07 

1.08 

1.09 

9 

1.10 

1.12 

1.13 

.14 

1.15 

1.17 

1.18 

1.19 

.20 

1.21 

10 

1.23 

1.24 

1.25 

.26 

1.28 

1.29 

1.30 

1.31 

.32 

1.34 

11 

1.35 

1.36 

1.37 

.39 

1.40 

1.41 

1.42 

1.44 

.45 

1.46 

12 

1.47 

1.48 

1.50 

.51 

1.52 

1.53 

1.55 

1.56 

.57 

1.58 

13 

1.59 

1.61 

1.62 

.63 

1.64 

1.66 

1.67 

1.68 

.69 

1.71 

14 

1.72 

1.73 

1.74 

.75 

1.77 

1.78 

1.79 

1.80 

.82 

1.83 

15 

1.84 

1.85 

1.86 

1.88 

1.89 

1.90 

1.91 

1.93 

.94 

1.95 

16 

1.96 

1.97 

1.99 

2.00 

2.01 

2.02 

2.04 

2.05 

2.06 

2.07 

17 

2'.09 

2.10 

2.11 

2.12 

2.13 

2.15 

2.16 

2.17 

2.18 

2.20 

18 

2.21 

2.22 

2.23 

2.24 

2.26 

2.27 

2.28 

2.29 

2.31 

2.32 

19 

2.33 

2.34 

2.36 

2.37 

2.38 

2.39 

2.40 

2.42 

2.43 

2.44 

20 

2.45 

2.47 

2.48 

2.49 

2.50 

2.51 

2.53 

2.54 

2.55 

2.56 

21 

2.58 

'2.59 

2.60 

2.61 

2.63 

2.64 

2.65 

2.66 

2.67 

2.69 

22 

2.70 

2.71 

2.72 

2.74 

2.75 

2.76 

2.77 

2.78 

2.80 

2.81 

23 

2.82 

2.83 

2.85 

2.86 

2.87 

2.88 

2.89 

2.91 

2.92 

2.93 

24 

2.94 

2.96 

2.97 

2.98 

2.99 

3.01 

3.02 

3.03 

3.04 

3.05 

25 

3.07 

3-08 

3.09 

3.10 

3.12 

3.13 

3.14 

3.15 

3.16 

3.18 

26 

3.19 

3-20 

3.21 

3.23 

3.24 

3.25 

3.26 

3.28 

3.29 

3.30 

27 

3.31 

3-32 

3.34 

3.35 

3.36 

3.37 

3.39 

3.40 

3.41 

3.42 

28 

3.43 

3-45 

3.46 

3.47 

3.48 

3.50 

3.51 

3.52 

3.53 

3.54 

29 

3.56 

3-57 

3.58 

3.59 

3.61 

3.62 

3.63 

3.64 

3.66 

3.67 

30 

3.68 

3.69 

3.70 

3.72 

3.73 

3.74 

3.75 

3.77 

3.78 

3.79 

31 

3.80 

3-81 

3.83 

3.84 

3-85 

3-86 

3.88 

3.89 

3.90 

3.91 

32 

3.93 

3-94 

3.95 

3.96 

3-97 

3.99 

4.00 

4.01 

4.02 

4.04 

33 

4.05 

4-06 

4.07 

4.08 

4.10 

4-11 

4.12 

4.13 

4.15 

4.16 

34 

4.17 

4-18 

4.20 

4.21 

4.22 

4-23 

4.24 

4.26 

4.27 

4.28 

35 

4.29 

4-31 

4.32 

4.33 

4.34 

4-35 

4.37 

4.38 

4.39 

4.40 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

c 


113 


33 


REDUCTION    OF    THE    BAROMETER   TO    THE    FREEZING    POINT. 


Centi- 
grade 
Degrees. 

BAROMETER  :  765mra-  (from  762.51  to  767.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.04 

0.05 

0.06 

0.07 

0.09 

0.10 

0.11 

1 

0.12 

0.14 

0.15 

0.16 

0.17 

0.19 

0.20 

0.21 

0.22 

0.23 

2 

0.25 

0.26 

0.27 

0.28 

0.30 

0.31 

0.32 

0.33 

0.35 

0.36 

3 

0.37 

0.38 

0.40 

0.41 

0.42 

0.43 

0.44 

0.46 

0.47 

0.48 

4 

0.49 

0.51 

0.52 

0.53 

0.54 

0.56 

0.57 

0.58 

0.59 

0.61 

5 

0.62 

0.63 

0.64 

0.65 

0.67 

0.68 

0.69 

0.70 

0.72 

0.73 

6 

0.74 

0.75 

0.77 

0.78 

0.79 

0.80 

0.82 

0.83 

0.84 

0.85 

7 

0.86 

0.88 

0.89 

0.90 

0.91 

0.93 

0.94 

0.95 

0.96 

0.98 

8 

0.99 

.00 

1.01 

.02 

1.04 

1.05 

1.06 

1.07 

1.09 

1.10 

9 

.11 

.12 

1.14 

.15 

1.16 

1.17 

1.19 

1.20 

1.21 

1.22 

10 

.23 

.25 

1.26 

.27 

1.28 

1.30 

1.31 

1.32 

1.33 

1.35 

11 

.36 

.37 

1.38 

.40 

1.41 

1.42 

1.43 

1.44 

.46 

.47 

12 

.48 

.49 

1.51 

.52 

1.53 

1.54 

1.56 

1.57 

.58 

.59 

13 

.61 

.62 

1.63 

.64 

1.65 

1.67 

1.68 

1.69 

.70 

.72 

14 

.73 

.74 

1.75 

.77 

1.78 

1.79 

1.80 

1.82 

.83 

.84 

15 

.85 

1.86 

1.88 

1.89 

1.90 

1.91 

1.93 

1.94 

,95 

.96 

16 

1.98 

1.99 

2.00 

2.01 

2.02 

2.04 

2.05 

2.06 

2.07 

2.09 

17 

2.10 

2.11 

2.12 

2.14 

2.15 

2.16 

2.17 

2.19 

2.20 

2.21 

18 

2.22 

2.23 

2.25 

2.26 

2.27 

2.28 

2.30 

2.31 

2.32 

2.33 

19 

2.35 

2.36 

2.37 

2.38 

2.40 

2.41 

2.42 

2.43 

2.44 

2.46 

20 

2.47 

2.48 

2.49 

2.51 

2.52 

2.53 

2.54 

2.56 

2.57 

2.58 

21 

2.59 

2.61 

2.62 

2.63 

2.64 

2.65 

2.67 

2.68 

2.69 

2.70 

22 

2.72 

2.73 

2.74 

2.75 

2.77 

2.78 

2.79 

2.80 

2.82 

2.83 

23  . 

2-84 

2.85 

2.86 

2.88 

2.89 

2.90 

2.91 

2.93 

2.94 

2.95 

24 

2.96 

2.98 

2.99 

3.00 

3.01 

3.03 

3.04 

3.05 

3.06 

3.07 

25 

3.09 

3.10 

3.11 

3.12 

3.14 

3.15 

3.16 

3.17 

3.19 

3.20 

26 

3.21 

3.22 

3.23 

3.25 

3.26 

3.27 

3.28 

3.30 

3.31 

3.32 

27 

3.33 

3.35 

3.36 

3.37 

3.38 

3.40 

3.41 

3.42 

3.43 

3.44 

28 

3.46 

3.47 

3.48 

3.49 

3.51 

3.52 

3.53 

3.54 

3.56 

3.57 

29 

3.58 

3.59 

3.61 

3.62 

3.63 

3.64 

3.65 

3.67 

3.68 

3.69 

30 

3.70 

3.72 

3.73 

3.74 

3.75 

3.77 

3.78 

3.79 

3.80 

3.82 

31 

3.83 

3.84 

3.85 

3.86 

3.88 

3.89 

3.90 

3.91 

3.93 

3.94 

32 

3.95 

3.96 

3.98 

3.99 

4.00 

4.01 

4.03 

4.04 

4.05 

4.06 

33 

4.07 

4.09 

4.10 

4.11 

4.12 

4.14 

4.15 

4.16 

4.17 

4.19 

34 

4.20 

4.21 

4.22 

4.24 

4.25 

4.26 

4.27 

4.28 

4.30 

4.31 

35 

4.32 

4.33 

4.35 

4.36 

4.37 

4.38 

4.40 

4.41 

4.42 

4.43 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

8. 

9. 

114 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING   POINT. 


34 


Centi- 
grade 
Degrees. 

BAROMETER  :  770ram-  (from  767.51  to  772.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

M  Him. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.02 

0.04 

0.05 

0.06 

0.07 

0.09 

0.10 

0.11 

1 

0.12 

0.14 

0.15 

0.16 

0.17 

0.19 

0.20 

0.21 

0.22 

0.24 

2 

0.25 

0.26 

0.27 

0.29 

0.30 

0.31 

0.32 

0.34 

0.35 

0.36 

3 

0.37 

0.39 

0.40 

0.41 

0.42 

0.43 

0.45 

0.46 

0.47 

0.48 

4 

0.50 

0.51 

0.52 

0.53 

0.55 

0.56 

0.57 

0.58 

0.60 

0.61 

5 

0.62 

0.63 

0.65 

0.66 

0.67 

0.68 

0.70 

0.71 

0.72 

0.73 

6 

0.75 

0.76 

0.77 

0.78 

0.80 

0.81 

0.82 

0.83 

0.85 

0.86 

7 

0.87 

0.88 

0.89 

0.91 

0.92 

0.93 

0.94 

0.96 

0.97 

0.98  ' 

8 

0.99 

1.01 

1.02 

.03 

1.04 

1.06 

1.07 

1.08 

1.09 

1.11 

9 

1.12 

1.13 

1.14 

.16 

1.17 

1.18 

1.19 

1.21 

1.22 

1.23 

10 

1.24 

1.26 

1,27 

.28 

1.29 

1.30 

1.32 

1.33 

1.34 

1.35 

11 

.37 

1.38 

1.39 

.40 

1.42 

1.43 

1.44 

1.45 

1.47 

1.48 

12 

.49 

1.50 

1.52 

.53 

1.54 

1.55 

1.57 

1.58 

1.59 

1.60 

13 

.62 

1.63 

1.64 

.65 

1.67 

1.68 

1.69 

1.70 

1.72 

1.73 

14 

.74 

1.75 

1.76 

.78 

1.79 

1.80 

1.81 

1.83 

1.84 

1.85 

15 

.86 

1.88 

1.89 

1.90 

1.91 

1.93 

1.94 

1.95 

1.96 

1.98 

16 

1.99 

2.00 

2.01 

2.03 

2.04 

2.05 

2.06 

2.08 

2.09 

2.10 

17 

2.11 

2.13 

2.14 

2.15 

2.16 

2.17 

2.19 

2.20 

2.21 

2.22 

18 

2.24 

2.25 

2.26 

2.27 

2.29 

2.30 

2.31 

2.32 

2.34 

2.35 

19 

2.36 

2.37 

2.39 

2.40 

2.41 

2.42 

2.44 

2.45 

2.46 

2.47 

20 

2.49 

2.50 

2.51 

2.52 

2.54 

2.55 

2.56 

2.57 

2.58 

2.60 

21 

2.61 

2.62 

2.63 

2.65 

2.66 

2.67 

2.68 

2.70 

2.71 

2.72 

22 

2.73 

2.75 

•  2.76 

2.77 

2.78 

2.80 

2.81 

'  2.82 

2.83 

2.85 

23 

2.86 

2.87 

2.88 

2.90 

2.91 

2.92 

2.93 

2.95 

2.96 

2.97 

24 

2.98 

3.00 

3.01 

3.02 

3.03 

3.04 

3.06 

3.07 

3.08 

3.09 

25 

3.11 

3.12 

3.13 

3.14 

3.16 

3.17 

3.18 

3.19 

3.21 

3.22 

26 

3.23 

3.24 

3.26 

3.27 

3.28 

3.29 

3.31 

3.32 

3.33 

3.34 

27 

3.36 

3.37 

3.38 

3.39 

3.41 

3.42 

3.43 

3.44 

3.45 

3.47 

28  ' 

3.48 

3.49 

3.50 

3.52 

3.53 

3.54 

3.55 

3.57 

3-58 

3.59 

29 

3.60 

3.62 

3-63 

3.64 

3.65 

3.67 

3.68 

3.69 

3.70 

3.72 

30 

3.73 

3.74 

3.75 

3.77 

3.7.8 

3.79 

3.80 

3.82 

3.83 

3.84 

31 

3.85 

3.87 

3.88 

3.89 

3.90 

3.91 

3.93 

3.94 

3.95 

3.96 

32 

3.98 

3.99 

4.00 

4.01 

4.03 

4.04 

4.05 

4.06 

4.08 

4.09 

33 

4.10 

4.11 

4.13 

4.14 

4.15 

4.16 

4.18 

4.19 

4.20 

4.21 

34 

4.23 

4.24 

4.25 

4.26 

4.28 

4.29 

4.30 

4.31 

4.32 

4.34 

35 

4.35 

4.36 

4-37 

4.39 

4.40 

4.41 

4.42 

4.44 

4.45 

4.46 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

c 


115 


35 


REDUCTION    OF    THE    BAROMETER   TO    THE    FREEZING    POINT. 


Centi- 
grade 
Degrees. 

BAROMETER  :  775mm-  (from  772.51  to  777.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

0 

Millim. 
0.00 

Millim. 
0.01 

Millim. 
0.03 

Millim. 
0.04 

Millim. 
0.05 

Millim. 
0.06 

Millim. 
0.08 

Millim. 
0.09 

Millim. 
0.10 

Millim. 
0.11 

1 

0.13 

0.14 

0.15 

0.16 

0.18 

0.19 

0.20 

0.21 

0.23 

0.24 

2 

0.25 

0.26 

0.28 

0.29 

0.30 

0.31 

0.33 

0.34 

0.35 

0.36 

3 

0.38 

0.39 

0.40 

0.41 

0.43 

0.44 

0.45 

0.46 

0.48 

0.49 

4 

0.50 

0.51 

0.53 

0.54 

0.55 

0.56 

0.58 

0.59 

0.60 

0.61 

5 

0.63 

0.64 

0.65 

0.66 

0.68 

0.69 

0.70 

0.71 

0.73 

0.74 

6 

0.75 

0.76 

0.78 

0.79 

0.80 

0.81 

0.83 

0.84 

0.85 

0.86 

7 

0.88 

0.89 

0.90 

0.91 

0.93 

0.94 

0.95 

0.96 

0.98 

0.99 

8 

1.00 

1.01 

1.03 

1.04 

.05 

.06 

1.08 

1.09 

1.10 

1.11 

9 

1.13 

1.14 

1.15 

1.16 

.18 

.19 

1.20 

1.21 

1.23 

1.24 

10 

1.25 

1.26 

1.28 

1.29 

.30 

.31 

1.33 

1.34 

1.35 

1.36 

11 

.38 

1.39 

1.40 

1.41 

.43 

.44 

.45 

.46 

1.48 

1.49 

12 

.50 

1.51 

1.53 

1.54 

.55 

.56 

.58 

.59 

1.60 

1.61 

13 

.63 

1.64 

1.65 

1.66 

.68 

.69 

.70 

.71 

1.73 

1.74 

14 

.75 

1.76 

1.78 

1.79 

.80 

1.81 

.83 

.84 

1.85 

1.86 

15 

.88 

1.89 

1.90 

1.91 

.93 

1.94 

.95 

.96 

1.98 

1.99 

16 

2.00 

2.01 

2.03 

2.04 

2.05 

2.06 

2.08 

2.09 

2.10 

2.11 

17 

2.13 

2.14 

2.15 

2.16 

2.18 

2.19 

2.20 

2.21 

2.23 

2.24 

18 

2.25 

2.26 

2.28 

2.29 

2.30 

2.31 

2.33 

2.34 

2.35 

2.36 

19 

2.38 

2.39 

2.40 

2.41 

2.43 

2.44 

2.45 

2.46 

2.48 

2.49 

20 

2.50 

2.51 

2.53 

2.54 

2.55 

2.56 

2.58 

2.59 

2.60 

2.61 

21 

2.63 

2.64 

2.65 

2.66 

2.68 

2.69 

2.70 

2.71 

2.73 

2.74 

22 

2.75 

2.76 

2.78 

2.79 

2.80 

2.81 

2.83 

2.84 

2.85 

2.86 

23 

2.88 

2.89 

2.90 

2.91 

2.93 

2.94 

2.95 

2.96 

2.98 

2.99 

24 

3.00 

3.01 

3.03 

3.04 

3.05 

3.06 

3.08 

3.09 

3.10 

3.11 

25 

3.13 

3.14 

3.15 

3.16 

3.18 

3.19 

3.20 

3.21 

3.23 

3.24 

26 

3.25 

3.26 

3.28 

3.29 

3.30 

3.31 

3.33 

3.34 

3.35 

3.36 

27 

3.38 

3.39 

3.40 

3.41 

3.43 

3.44 

3.45 

3.46 

3.48 

3.49 

28 

3.50 

3.51 

3.53 

3.54 

3.55 

3.56 

3.58 

3.59 

3.60 

3.61 

29 

3.63 

3.64 

3.65 

3.66 

3.68 

3.69 

3.70 

3.72 

3.73 

3.74 

30 

3.75 

3.77 

3.78 

3.79 

3.80 

3.82 

3.83 

3.84 

3.85 

3.87 

31 

3.88 

3.89 

3.90 

3.92 

3.93 

3.94 

3.95 

3.97 

3-98 

3.99 

32 

4.00 

4.02 

4.03 

4.04 

4.05 

4.07 

4.08 

4.09 

4.10 

4.12 

33 

4.13 

4.14 

4,15 

4.17 

4.18 

4.19 

4.20 

4.22 

4.23 

4.24 

34 

4.25 

4.27 

4.28 

4.29 

4.30 

4.32 

4.33 

4.34 

4.35 

4.37 

35 

4.38 

4.39 

4.40 

4.42 

4.43 

4.44 

4.45 

4.47 

4.48 

4.49 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

116 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


36 


Centi- 
grade 
Degrees 

BAROMETER  :  780mm-  (from  777.51  to  782.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

M  Him. 

Millim. 

0 

0.00 

,  0.01 

0.03 

0.04 

0.05 

0.06 

0.08 

0.09 

0.10 

0.11 

1 

0.13 

0.14 

0.15 

0.16 

0.18 

0.19 

0.20 

0.21 

0.23 

0.24 

2 

0.25 

0.26 

0.28 

0.29 

0.30 

0.31 

0.33 

0.34 

0.35 

0.37 

3 

0.38 

0.39 

0.40 

0.42 

0.43 

0.44 

0.45 

0.47 

0.48 

0.49 

4 

0.50 

0.52 

0.53 

0.54 

0.55 

0.57 

0.58 

0.59 

0.60 

0.62 

5 

0.63 

0.64 

0.65 

0.67 

0.68 

0.69 

0.70 

0.72 

0.73 

0.74 

6 

0.76 

0.77 

0.78 

0.79 

0.81 

0.82 

0.83 

0.84 

0.86 

0.87 

7 

0.88 

0.89 

0.91 

0.92 

0.93 

0.94 

0.96 

0.97 

0.98 

0.99 

8 

1.01 

1.02 

1.03 

1.04 

1.06 

1.07 

1.08 

1.10 

1.11 

1.12 

9 

1.13 

1.15 

1.16 

1.17 

.18 

1.20 

1.21 

1.22 

.23 

1.25 

10 

1.26 

1.27 

1.28 

1.30 

.31 

1.32 

1.33 

1.35 

.36 

1.37 

11 

1.38 

1.40 

.41 

1.42 

.44 

1.45 

1.46 

1.47 

.49 

1.50 

12 

1.51 

1.52 

.54 

1.55 

.56 

1.57 

1.59 

1.60 

.61 

1.62 

13 

1.64 

1.65 

.66 

1.67 

.69 

1.70 

1.71 

1.72 

.74 

1.75 

14 

1.76 

1.78 

.79 

1.80 

.81 

1.83 

1.84 

1.85 

.86 

1.88 

15 

1.89 

1.90 

.91 

1.93 

.94 

1.95 

1.96 

1.98 

.99 

2.00 

16 

2.01 

2.03 

2.04 

2.05 

2.06 

2.08 

2.09 

2.10 

2.11 

2.13 

17 

2.14 

2.15 

2.17 

2.18 

2.19 

2.20 

2.22 

2.23 

2.24 

2.25 

18 

2.27 

2.28 

2.29 

2.30 

2.32 

2.33 

2.34 

2.35 

2.37 

2.38 

19 

2.39 

2.40 

2.42 

2.43 

2.44 

2.45 

2.47 

2.48 

2.49 

2.51 

20 

2.52 

2.53 

2.54 

2.56 

2.57 

2.58 

2.59 

2.61 

2.62 

2.63 

21 

2.64 

2.66 

2.67 

2.68 

2.69 

2.71 

2.72 

2.73 

2.74 

2.76 

22 

2.77 

2.78 

2.79 

2.81 

2.82 

2.83 

2.85 

2.86 

2.87 

2.88 

23 

2.90 

2.91 

2.92 

2.93 

2.95 

2.96 

2.97 

2.98 

3.00 

3.01 

24 

3.02 

3.03 

3.05 

3.06 

3.07 

3.08 

3.10 

3.11 

3.12 

3.14 

25 

3.15 

3.16 

3.17 

3.19 

3.20 

3.21 

3.22 

3.24 

3.25 

3.26 

26 

3.27 

3.29 

3.30 

3.31 

3.32 

3.34 

3.35 

3.36 

3.37 

3.39* 

27 

3.40 

3.41 

3.42 

3.44 

3.45 

3.46 

3.47 

3.49 

3.50 

3.51 

28 

3.52 

3.54 

3.55 

3.56 

3.58 

3.59 

3.60 

3.61 

3.63 

3.64 

29 

3.65 

3.66 

3.68 

3.69 

3.70 

3.71 

3.73 

3.74 

3.75 

3.76 

30 

3.78 

3.79 

3.80 

3.81 

3.83 

3.84 

3.85 

3.86 

3.88 

3.89 

31 

3.90 

3.92 

3.93 

3.94 

3.95 

3.97 

3.98 

3.99 

4.00 

4.02 

32 

4.03 

4.04 

4.05 

4.07 

4.08 

4.09 

4.10 

4.12 

4.13 

4.14 

33 

4.15 

4.17 

4.18 

4.19 

4.20 

4.22 

4.23 

4.24 

4.26 

4.27 

34 

4.28 

4.29 

4.31 

4.32 

4.33 

4.34 

4.36 

4.37 

4.38 

4.39 

35 

4.41 

4.42 

4.43 

4.44 

4.46 

4.47 

4.48 

4.49 

4.51 

4.52 

o. 

1. 

2. 

3. 

4. 

5. 

0. 

7. 

8. 

9. 

1 

<J 


117 


37 


REDUCTION    OF    THE    BAROMETER   TO    THE    FREEZING    POINT. 


Centi- 
grade 
Degrees. 

BAROMETER  :  785ram-  (from  782.51  to  787.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 
0 

Millim. 
0.00 

Millim. 
0.01 

Millim. 
0.03 

Millim. 
0.04 

Millim. 
0.05 

Millim. 
0.06 

Millim. 
0.08 

Millim. 
0.09 

Millim. 
0.10 

Millim. 
0.11 

1 

0.13 

0.14 

0.15 

0.16 

0.18 

0.19 

0.20 

0.22 

'  0.23 

0.24 

2 

0.25 

0.27 

0.28 

0.29 

0.30 

0.32 

0.33 

0.34 

0.35 

0.37 

3 

0.38 

0.39 

0.41 

0.42 

0.43 

0.44 

0.46 

0.47 

0.48 

0.49 

4 

0.51 

0.52 

0.53 

0.54 

0.56 

0.57 

0.58 

0.60 

0.61 

0.62 

5 

0.63 

0.65 

0.66 

0.67 

0.68 

0.70 

0.71 

0.72 

0.73 

0.75 

6 

0.76 

0.77 

0.79 

0.80 

0.81 

0.82 

0.84 

0.85 

0.86 

0.87 

7 

0.89 

0.90 

0.91 

0.92 

0.94 

0.95 

0.96 

0.98 

0.99 

1.00 

8 

1.01 

.03 

.04 

1.05 

1.06 

.08 

1.09 

1.10 

1.11 

1.13 

9 

1.14 

.15 

.17 

1.18 

1.19 

.20 

1.22 

1.23 

1.24 

1.25 

10 

1.27 

.28 

.29 

1.30 

1.32 

.33 

1.34 

1.36 

1.37 

1.38 

11 

1.39 

.41 

.42 

1.43 

1.44 

.46 

1.47 

1.48 

1.50 

1.51 

12 

1.52 

.53 

.55 

1.56 

1.57 

.58 

1.60 

1.61 

1.62 

1.63 

13 

1.65 

.66 

.67 

1.69 

1.70 

.71 

1.72 

1.74 

1.75 

1.76 

14 

1.77 

.79 

.80 

1.81 

1.82 

.84 

1.85 

1.86 

1.88 

1.89 

15 

1.90 

.91 

.93 

1.94 

1.95 

.96 

1.98 

1.99 

2.00 

2.01 

16 

2.03 

2.04 

2.05 

'2.07 

2.08 

2.09 

2.10 

2.12 

2.13 

2.14 

17 

2.15 

2.17 

2.18 

2.19 

2.20 

2.22 

2.23 

2.24 

2.26 

2.27 

18 

2.28 

2.29 

2.31 

2.32 

2.33 

2.34 

2,36 

2.37 

2.38 

2.39 

19 

2.41 

2.42 

2.43 

2.45 

2.46 

2.47 

2.48 

2.50 

2.51 

2.52 

20 

2.53 

2.55 

2.56 

2.57 

2.58 

2.60 

2.61 

2.62 

2.64 

2.65 

21 

2.66 

2.67 

2.69 

2.70 

2.71 

2.72 

2.74 

2.75 

2.76 

2.77 

22 

2.79 

2.80 

2.81 

2.83 

2.84 

2.85 

2.86 

2.88 

2.89 

2.90 

23 

2.91 

2.93 

2.94 

2.95 

2.96 

2.98 

2.99 

3.00 

3.02 

3.03 

24 

3.04 

3.05 

3.07 

3.08 

3.09 

3.10 

3.12 

3.13 

3.14 

3.15 

25 

3.17 

3.18 

3.19 

3.21 

3.22 

3.23 

3.24 

3.26 

3.27 

3.28 

'26 

3.29 

3.31 

3.32 

3.33 

3.34 

3.36 

3.37 

3.38 

3.40 

3.41 

27 

3.42 

3.43 

3.45 

3.46 

3.47 

3.48 

3.50 

3.51 

3.52 

3.53 

28 

3.55 

3.56 

3.57 

3.59 

3.60 

3.61 

3.62 

3.64 

3.65 

3.66 

29 

3.67 

3.69 

3.70 

3.71 

3.72 

3.74 

3.75 

3.76 

3.78 

3.79 

30 

3.80 

3.81 

3.83 

3.84 

3.85 

3.86 

3.88 

3.89 

3.90 

3.91 

31 

3.93 

3.94 

3.95 

3.97 

3.98 

3.99 

4.00 

4-02 

4.03 

4.04 

32 

4.05 

4.07 

4.08 

4.09 

4.11 

4.12 

4.13 

4.14 

4.16 

4.17 

33 

4.18 

4.19 

4.21 

4.22 

4.23 

4.24 

4.26 

4.27 

4.28 

4.30 

34 

4.31 

4.32 

4.33 

4.35 

4.36 

4.37 

4.38 

4.40 

4.41 

4.42 

35 

4.43 

4.45 

4.46 

4.47 

4.49 

4.50 

4.51 

4.52 

4.54 

4.55 

O. 

1.           2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

118 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


BAROMETER  :  790ram-  (from  787.51  to  792.50). 

Centi- 
grade 

•                                                    Tenths  of  Degrees. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.03 

0.04 

0.05 

0.06 

0.08 

0.09 

0.10 

0.11 

1 

0.13 

0.14 

0.15 

0.17 

0.18 

0.19 

0.20 

0.22 

0.23 

0.24 

2 

0.26 

0.27 

0.28 

0.29 

0.31 

0.32 

0.33 

0.34 

0.36 

0.37 

3 

0.38 

0.40 

0.41 

0.42 

0.43 

0.45 

0.46 

0.47 

0.48 

0.50 

4 

0.51 

0.52 

0.54 

0.55 

0.56 

0.57 

0.59 

0.60 

0.61 

0.62 

5 

0.64 

0.65 

0.66 

0.68 

0.69 

0.70 

0.71 

0.73 

0.74 

0.75 

6 

0.77 

0.78 

0.79 

0.80 

0.82 

0.83 

0.84 

0.85 

0.87 

0.88 

7 

0.89 

0.91 

0.92 

0.93 

0.94 

0.96 

0.97 

0.98 

0.99 

.01 

8 

.02 

1.03 

1.05 

1.06 

1.07 

1.08 

.10 

.11 

1.12 

.13 

9 

.15 

1.16 

1.17 

1.19 

1.20 

1.21 

.22 

.24 

1.25 

.26 

10 

.28 

1.29 

1.30 

1.31 

1.33 

1.34 

.35 

.36 

1.38 

.39 

11 

.40 

.42 

1.43 

1.44 

1.45 

1.47 

.48 

.49 

1.50 

.52 

12 

.53 

.54 

1.56 

1.57 

1.58 

1.59 

.61 

.62 

1.63 

.64 

13 

.66 

.67 

1.68 

1.70 

1.71 

1.72 

.73 

.75 

1.76 

.77 

14 

1.79 

.80 

1.81 

1.82 

1.84 

1.85 

.86 

.87 

1.89 

.90 

15 

1.91 

.93 

1.94 

1.95 

1.96 

1.98 

1.99 

2.00 

2.01 

2.03 

16 

2.04 

2.05 

2.07 

2.08 

2.09 

2.10 

2.12 

2.13 

2.14 

2.15 

17 

2.17 

2.18 

2.19 

2.21 

2.22 

2.23 

2.24 

2.26 

2.27 

2.28 

18 

2.30 

2.31 

2.32 

2.33 

2.35 

2.36 

2.37 

2.38 

2.40 

2.41 

19 

2.42 

2.44 

2.45 

2.46 

2.47 

2.49 

2.50 

2.51 

2.52 

2.54 

20 

2.55 

2.56 

2.58 

2.59 

2.60 

2.61 

2.63 

2.64 

2.65 

2.66 

21 

2.68 

2.69 

2.70 

2.72 

2.73 

2.74 

2.75 

2.77 

2.78 

2.79 

22 

2.81 

2.82 

2.83 

2.84 

2.86 

2.87 

2.88 

2.89 

2.91 

2.92 

23 

2.93 

2.95 

2.96 

2.97 

2.98 

3.00 

3.01 

3.02 

3.03 

3.05 

24 

3.06 

3.07 

3.09 

3.10 

3.11 

3.12 

3.14 

3.15 

3.16 

3.17 

25 

3.19 

3.20 

3.21 

3.23 

3.24 

3.25 

3.26 

3.28 

3.29 

3.30 

26 

3.32 

3.33 

3.34 

3.35 

3.37 

3.38 

3.39 

3.40 

3.42 

3.43 

27 

3.44 

3.46 

3.47 

3.48 

3.49 

3.51 

3.52 

3.53 

3.54 

3.56 

28 

3.57 

3.58 

3.60 

3.61 

3.62 

3.63 

3.65 

3.66 

3.67 

3.68 

29 

3.70 

3.71 

3.72 

3.74 

3.75 

3.76 

3.77 

3.79 

3.80 

3.81 

30 

3.83 

3.84 

3.85 

3.86 

3.88 

3.89 

3.90 

3.91 

3.93 

3.94 

31 

3.95 

3.97 

3.98 

3.99 

4.00 

4.02 

4.03 

4.04 

4.05 

4.07 

32 

4.08 

4.09 

4.11 

4.12 

4.13 

4.14 

4.16 

4.17 

4.18 

4.19 

33 

4.21 

4.22 

4.23 

4.25 

4.26 

4.27 

4.28 

4.30 

4.31 

4.32 

34 

4.34 

4.35 

4.36 

4.37 

4.39 

4.40 

4.41 

4.42 

4.44 

4.45 

35 

4.46 

4.48 

4.49 

4.50 

4.51 

4.53 

4.54 

4.55 

4.56 

4.58 

0. 

1. 

2. 

3, 

4. 

5. 

6. 

7. 

8. 

9. 

c 


119 


REDUCTION    OF    THE    BAROMETER    TO    THE    FREEZING    POINT. 


Centi- 
grade 
Degrees. 

BAROMETER  :  795mm  (from  792.51  to  797.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 
0 

Millim. 
0.00 

Millim. 
0.01 

Millim. 
0.03 

Millim. 
0.04 

Millim. 
0.05 

Millim. 
0.06 

Millim. 
0.08 

Millim. 
0.09 

Millim. 
0.10 

Millim. 
0.12 

1 

0.13 

0.14 

0.15 

0.17 

0.18 

0.19 

0.21 

0.22 

0.23 

0.24 

2 

0.26 

0.27 

0.28 

0.30 

0.31 

0.32 

0.33 

0.35 

0.36 

0.37 

3 

0.38 

0.40 

0.41 

0.42 

0.44 

0.45 

0.46 

0.47 

0.49 

0.50 

4 

0.51 

0.53 

0.54 

0.55 

0.56 

0.58 

0.59 

0.60 

0.62 

0.63 

5 

0.64 

0.65 

0.67 

0.68 

0.69 

0.71 

0.72 

0.73 

0.74 

0.76 

6 

0.77 

0.78 

0.80 

0.81 

10.82 

0.83 

0.85 

0.86 

0.87 

0.89 

7 

0.90 

0.91 

0.92 

0.94 

0.95 

0.96 

0.98 

0.99 

.00 

1.01 

8 

1.03 

1.04 

1.05 

1.06 

.08 

1.09 

1.10 

1.12 

.13 

1.14 

9 

1.15 

1.17 

1.18 

.19 

.21 

1.22 

1.23 

1.24 

.26 

1.27 

10 

1.28 

1.30 

1.31 

.32 

.33 

1.35 

1.36 

1.37 

.39 

1.40 

11 

1.41 

.42 

1.44 

.45 

.46 

1.48 

1.49 

1.50 

.51 

1.53 

12 

1.54 

.55 

1.57 

.58 

.59 

1.60 

1.62 

1.63 

.64 

1.66 

13 

1.67 

.68 

1.69 

.71 

.72 

1.73 

1.75 

1.76 

.77 

1.78 

14 

1.80 

.81 

1.82 

.83 

1.85 

1.86 

1.87 

1.89 

.90 

1.91 

15 

1.92 

.94 

1.95 

.96 

1.98 

1.99 

2.00 

2.01 

2.03 

2.04 

16 

2.05 

2.07 

2.08 

2.09 

2.10 

2.12 

2.13 

2.14 

2.16 

2.17 

17 

2.18 

2-19 

2.21 

2.22 

2.23 

2.25 

2.26 

2.27 

2.28 

2.30 

18 

2.31 

2.32 

2.34 

2.35 

2.36 

2.37 

2.39 

2.40 

2.41 

2.43 

19 

2.44 

2.45 

2.46 

2.48 

2.49 

2.50 

2.51 

2.53 

2.54 

2.55 

20 

2.57 

2.58 

2.59 

2.60 

2.62 

2.63 

2.64 

2.66 

2.67 

2.68 

21 

2.69 

2.71 

2.72 

2.73 

2.75 

2.76 

2.77 

2.78 

2.80 

2.81 

22 

2.82 

2.84 

2.85 

2.86 

2.87 

2.89 

2.90 

2.91 

2.93 

2.94 

23 

2.95 

2.96 

2.98 

2.99 

3.00 

3.02 

3.03 

3.04 

3.05 

3.07 

24 

3.08 

3.09 

3.11 

3.12 

3.13 

3.14 

3.16 

3.17 

3.18 

3.19 

25 

3.21 

3.22 

3.23 

3.25 

3.26 

3.27 

'  3.28 

3.30 

3.31 

3.32 

26 

3.34 

3.35 

3.36 

3.37 

3.39 

3.40 

3.41 

3.43 

3.44 

3.45 

27 

3.46 

3.48 

3.49 

3.50 

3.52 

3.53 

3.54 

3.55 

3.57 

3.58 

28 

3.59 

3.61 

3.62 

3.63 

3.64 

3.66 

3.67 

3.68 

3.70 

3.71 

29 

3.72 

3.73 

3.75 

3.76 

3.77 

3.79 

3-80 

3.81 

3.82 

3.84 

30 

3.85 

3.86 

3.88 

3.89 

3.90 

3.91 

3.93 

3.94 

3.95 

3.96 

31 

3.98 

3.99 

4.00 

4.02 

4-03 

4.04 

4-05 

4.07 

4.08 

4.09 

32 

4.11 

4.12 

4.13 

4.14 

4-16 

4.17 

4.18 

4.20 

4.21 

4.22 

33 

4.23 

4.25 

4.26 

4.27 

4-29 

4.30 

4.31 

4.32 

4.34 

4.35 

34 

4.36 

4.38 

4.39 

4.40 

4-41 

4.43 

4.44 

4.45 

4.47 

4.48 

35 

4.49 

4.50 

4.52 

4.53 

4.54 

4.56 

4.57 

4.58 

4.59 

4.61 

0. 

1. 

2. 

3. 

4. 

5. 

0. 

•7. 

S. 

9. 

120 


REDUCTION    OF   THE   BAROMETER   TO    THE    FREEZING    POINT. 


40 


Centi- 
grade 
Degrees. 

BAROMETER  :  800mra-  (from  797.51  to  802.50). 

Tenths  of  Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

S. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

0 

0.00 

0.01 

0.03 

0.04 

0.05 

0.06 

0.08 

0.09 

0.10 

0.12 

1 

0.13 

0.14 

0.15 

0.17 

0.18 

0.19 

0.21 

0.22 

0.23 

0.25 

2 

0.26 

0.27 

0.28 

0.30 

0.31 

0.32 

0.34 

0.35 

0.36 

0.37 

3 

0.39 

0.40 

0.41 

0.43 

0.44 

0.45 

0.46 

0.48 

0.49 

0.50 

4 

0.52 

0.53 

0.54 

0.56 

0.57 

0.58 

0.59 

0.61 

0.62 

0.63 

5 

0.65 

0.66 

0.67 

0.68 

0.70 

0.71 

0.72 

0.74 

0.75 

0.76 

6 

0.77 

0.79 

0.80 

0.81 

0.83 

0.84 

0.85 

0.87 

0.88 

0.89 

7 

0.90 

0.92 

0.93 

0.94 

0.96 

0.97 

0.98 

0.99 

1.01 

1.02 

8 

1.03 

1.05 

1.06 

1.07 

.08 

.10 

1.11 

1.12 

1.14 

1.15 

9 

1.16 

1.17 

1.19 

1.20 

.21 

.23 

1.24 

1.25 

1.27 

1.28 

10 

1.29 

1.30 

1.32 

1.33 

.34 

.36 

1.37 

1.38 

1.39 

1.41 

11 

1.42 

1.43 

1.45 

1.46 

.47 

.48 

1.50 

1.51 

1.52 

1.54 

12 

1.55 

1.56 

1.58 

1.59 

.60 

.61 

1.63 

1.64 

1.65 

1.67 

13 

1.68 

1.69 

1.70 

1.72 

.73 

.74 

1.76 

1.77 

1.78 

1.79 

14 

1.81 

1.82 

1.83 

1.85 

.86 

1.87 

1.89 

1.90 

1.91 

1.92 

15 

1.94 

1.95 

1.96 

1.98 

.99 

2.00 

2.01 

2.03 

2.04 

2.05 

16 

2.07 

2.08 

2.09 

2.10 

2.12 

2.13 

2.14 

2.16 

2.17 

2.18 

17 

2.20 

2.21 

2.22 

2.23 

2.25 

2.26 

2.27 

2.29 

2.30 

2.31 

18 

2.32 

2.34 

2.35 

2.36 

2.38 

2*39 

2.40 

2.41 

2.43 

2.44 

19 

2.45 

2.47 

2.48 

2.49 

2.50 

2.52 

2.53 

2.54 

2.56 

2.57 

20 

2.58 

2.60 

2.61 

2.62 

2.63 

2.65 

2.66 

2.67 

2.69 

2.70 

21 

2.71 

2.72 

2.74 

2.75 

2.76 

2.78 

2.79 

2.80 

2.81 

2.83 

22 

2.84 

2.85 

2.87 

2.88 

2.89 

2.91 

2.92 

2.93 

2.94 

2.96 

23 

2.97 

2.98 

3.00 

3.01 

3.02 

3.03 

3.05 

3.06 

3.07 

3.09 

24 

3.10 

3.11 

3.12 

3.14 

3.15 

3.16 

3.18 

3.19 

3.20 

3.22 

25 

3.23 

3.24 

3.25 

3.27 

3.28 

3.29 

3.31 

3.32 

3.33 

3.34 

26 

3.36 

3.37 

3.38 

3.40 

3.41 

3.42 

3.43 

.  3.45 

3.46 

3.47 

27 

3.49 

3.50 

3.51 

3.52 

3.54 

3.55 

3.56 

3.58 

3.59 

3.60 

28 

3.62 

3.63 

3.64 

3.65 

3.67 

3.68 

3.69 

3.71 

3.72 

3.73 

29 

3.74 

3.76         3.77 

3.78 

3.80 

3.81 

3.82 

3.83 

3.85 

3.86 

30 

3.87 

3.89 

3.90 

3.91 

3.93 

3.94 

3.95 

3.96 

3.98 

3.99 

31 

4.00 

4.02 

4.03 

4.04 

4.05 

4.07 

4.08 

4.09 

4.11 

4.12 

32 

4.13 

4.14 

4.16 

4.17 

4.18 

4.20 

4.21 

4.22 

4.24 

4.25 

33 

4.26 

4.27 

4.29 

4.30 

4.31 

4.33 

4.34 

4.35 

4.36 

4.38 

34 

4.39 

4.40 

4.42 

4.43 

4.44 

4.45 

4.47 

4.48 

4.49 

4.51 

35 

4.52 

4.53 

4.55 

4-56 

4.57 

4.58 

4.60 

4.61 

4.62 

4.64 

0. 

1.           2. 

3. 

4. 

5. 

6. 

7.     ' 

8. 

9. 

c 


121 


XXI. 


OLD    FRENCH    BAROMETER 


TABLE 

FOE 

REDUCING  TO  THE   FREEZING   POINT   THE   OBSERVATIONS 
TAKEN    WITH    OLD    FRENCH    BAROMETERS, 

PROVIDED  WITH   BRASS    SCALES,  EXTENDING   FROM    THE    CISTERN   TO   THE 

TOP  OF  THE   MERCURIAL   COLUMN  ;    CALCULATED   FROM  240  TO  345 

LINES,  OR  FROM  23  INCHES  4  LINES  TO  28  INCHES  9  LINES. 

BY   KAEMTZ. 


123 


•    TABLE     XXI. 

This  table  is  taken  from  KAEMTZ'S  Lehrbuch  der  Meteorologie,  Vol.  II.  p.  236. 
To  render  it  more  useful,  the  first  page,  giving  the  corrections  for  Barometrical 
Heights  between  240  and  280  Paris  lines,  has  been  added. 

The  values  adopted  by  Kaemtz  for  reducing  the  Old  French  Barometer  are  the 
following  :  — 

Let  h  —  observed  height  in  French  lines. 

"    t    —  temperature  of  attached  thermometer  in  degrees  of  Reaumur. 
"    m  =  expansion  of  mercury  between  0  and  80°  Reaumur  =  0.018018. 
"    I   =  linear  expansion  of  brass  between  0  and  80°  Reaumur  =  0.0018782. 
The  normal  temperature  of  standard  being  =  13°  Reaumur. 
And  the  formula  becomes,  — 

,      m  X  t  —  I  (t  -  13) 


The  Table  gives  the  corrections  only  for  full  degrees  and  for  every  fifth  line  ;  but 
the  intermediate  values  can  easily  be  found  by  an  interpolation  at  sight. 

Example  of  Reduction. 

Observed  height      ......         —  32$.32  lines. 

Attached  thermometer     .....=    12.5  Reaumur. 

In  the  line  beginning  with  12°,  and  in  the  vertical  column  headed  325  lines, 
we  find,  Correction  for      12°       =  —  0.89  lines. 

Interpolation  for    0°.5   =  —  0.03     " 

Correction  for     12°.5  —  —  0.92  " 
And  we  have, 

Observed  height,  325.32  " 

Correction  for  12°.5,  —  0.92  " 

Height  at  the  freezing  point  =  324.40  lines. 


124 


XXI.     REDUCTION    OF    THE    OLD    FRENCH    BAROMETER    TO    THE    FREEZING   POINT. 
Normal  Temperature  of  the  Scale  =  13°  Reaumur. 


Attached 
Thermom- 
eter. 

Barometer  in  Paris  Lines. 

Attached 
Thermom- 
eter. 

Degrees  of 
Reaumur. 

240 

245 

250 

255 

260 

265 

270 

275 

^Degrees  of 
Reaumur. 

0 

Par.  Lines. 

Par.  Lines. 

Par.  Lines 

Par.  Lines. 

Par.  Lines. 

Par.  Lines. 

Par.  Lines 

Par.  Lines. 

o 

-15 

+0.65 

+0.66 

+0.68 

+0.69 

+0.70 

+0.72 

+0.73 

+0.75 

-15 

-14 

0.60 

0.61 

0.63 

0.64 

0.65 

0.67 

0.68 

0.69 

-14 

-13 

0.55 

0.57 

0.58 

0.59 

0.60 

0.61 

0.62 

0.64 

-13 

-12 

0.51 

0.52 

0.53 

0.54 

0.55 

0.56 

0.57 

0.58 

-12 

-11 

0.46 

0.47 

0.48 

0.49 

0.50 

0.51 

0.52 

0.52 

-11 

-10 

0.41 

0.42 

0.43 

0.44 

0.44 

0.45 

0.46 

0.47 

-10 

-  9 

+0.36 

+0.37 

+0.38 

+0.38 

+0.39 

+0.40 

+0.41 

+0.41 

-  9 

-  8 

0.31 

0.32 

0.33 

0.33 

0.34 

0.35 

0.35 

0.36 

-  8 

-  7 

0.27 

0.27 

0.28  , 

0.28 

0.29 

0.29 

0.30 

0.30 

-  7 

-  6 

0.22 

0.22 

0.23 

0.23 

0.24 

0.24 

0.24 

P.25 

-  6 

-  5 

0.17 

0.17 

0.18 

0.18 

0.18 

0.19 

0.19 

0.19 

-  5 

-  4 

+0.12 

+0.12 

+0.13 

+0.13 

+0.13 

•+0.13 

+0.14 

+0.14 

-  4 

-  3 

0.07 

0.07 

0.08 

0.08 

0.08 

0.08 

0.08 

0.08 

-  3 

-  2 

+0.02 

+0.03 

+0.03 

+0.03 

+0.03 

+0.03 

+0.03 

+0.03 

-  2 

-  1 

-0.02 

-0.03 

-0.03 

-0.03 

-0.03 

-0.03 

-0.03 

-0.03 

-  1 

0 

-0.07 

-0.07 

-0.08 

-0.08 

-0.08 

-0.08 

-0.08 

-0.08 

0 

+  1 

-0.12 

-0.12 

-0.13 

-0.13 

-0.13 

-0.13 

-0.14 

-0.14 

+  1 

2 

0.17 

0.17 

0.18 

0.18 

0.18 

0.19 

0.19 

0.19 

'2 

3 

0.22 

0.22 

0.23 

0.23 

0.24 

0.24 

0.24 

0.25 

3 

4 

0.27 

0.27 

0.28 

0.28 

0.29 

0.29 

0.30 

0.30 

4 

5 

0.31 

0.32 

0.33 

0.33 

0.34 

0.35 

0.35 

0.36 

5 

+  6 

-0.36 

-0.37 

-0.38 

-0.38 

-0.39 

-0.40 

-0.41 

-0.41 

+  6 

7 

0.41 

0.42 

0.43 

0.44 

0.44 

0.45 

0.46 

0.47 

7 

8 

0.46 

0.47 

0.48 

0.49 

0.50 

0.51 

0.52 

0.52 

8 

9 

0.51 

0.52 

0.53 

0.54 

0.55 

0.56 

0.57 

0.58 

9 

10 

0.55 

0.57 

0.58 

0.59 

0.60 

0.61 

0.62 

0.64 

10 

+11 

-0.60 

-0.61 

-0.63 

-0.64 

-0.65 

-0.67 

-0.68 

-0.69 

+11 

12 

0.65 

0.66 

0.68 

0.69 

0.70 

0.72 

0.73 

0.75 

12 

13 

0.70 

0.71 

0.73 

0.74 

0.76 

0.77 

0.79 

0.80 

13 

14 

0.75 

0.76 

0.78 

0.79 

0.81 

0.82 

0.84 

0.86 

14 

15 

0.80 

0.81 

0.83 

0.84 

0.86 

0.88 

0.89 

0.91 

15 

+16 

-0.84 

-0.86 

-0.88 

-0.90 

-0.91 

-0.93 

-0.95 

-0.97 

+16 

17 

0.89 

0.91 

0.93 

0.95 

0.97 

0.98 

1.00 

1.02 

17 

18 

0.94 

0.96 

0.98 

.00 

.02 

1.04 

1.06 

1.08 

18 

19 

0.99 

1.01 

1.03 

.05 

.07 

1.09 

.11 

.13 

19 

20 

1.04 

1.06 

1.08 

.10 

.12 

1.14 

.17 

.19 

20 

+21 

-1.08 

-1.11 

-1.13 

-  .15 

-  .17 

-  .20 

-  .22 

-  .24 

+21 

22 

1.13 

1.16 

1.18 

.20 

.23 

.25 

.27 

.30 

22 

23 

1.18 

1.20 

1.23 

.25 

.28 

.30 

.33 

.35 

23 

24 

1.23 

1.25 

1.28 

.31 

.33 

.36 

.38 

,  .41 

24 

25 

1.28 

1.30 

1.33 

.36 

.38 

.41 

.44 

.46 

25 

125 


REDUCTION  OF  THE  OLD  FRENCH  BAROMETER  TO  THE  FREEZING  POINT. 
Normal  Temperature  of  the  Scale  =  13°  Reaumur. 


Attached 
Thermom- 
eter. 

Degrees  tff 
Reaumur. 

Barometer  in  Paris  Lines. 

Attached 
Thermom- 
eter. 

Degrees  of 
Reaumur. 

280 

285 

290 

295 

300 

305 

310 

o 

Par.  Lines. 

Par.  Lines. 

Par.  Lines. 

Par.  Lines. 

Par.  Lines. 

Par.  Lines. 

Par.  Lines. 

^ 

-15 

+0.77 

+0.78 

+0.79 

+0.81 

fO.82 

+0.84 

+0.85 

-15 

-14 

0.71 

0.73 

0.74 

0.75 

0.76 

0.77 

0.79 

-14 

-13 

0.65 

0.67 

0.68 

0.69 

0.70 

0.71 

0.72 

-13 

-12 

0.60 

0.61 

0.62 

0.63 

0.64 

0.65 

0.66 

-12 

-11 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

0.60 

-11 

-10 

0.48 

0.49 

0.50 

0.51 

0.52 

0.53 

0.54 

-10 

-  9 

+0.43 

+0.44 

+0.44 

+0.45 

+0.46 

+0.46 

+0.47 

-  9 

-  8 

0.37 

0.38 

0.38 

0.39 

0.40 

0.40 

0.41 

-  8 

-  7 

0.31 

0.32 

0.32 

0.33 

0.34 

0.34 

0.35 

-  7 

-  6 

0.26 

0.26 

0.26 

0.27 

0.27 

0.28 

0.28 

-  6 

-  5 

0.20 

0.20 

0.21 

0.21 

0.21 

0.22 

0.22 

-  5 

-  4 

+0.14 

+0.15 

+0.15 

+0.15 

+0.15 

+0.16 

+0.16 

-  4 

-  3 

0.09 

0.09 

0.09 

0.09 

0.09 

0.09 

0.09 

o 

-  2 

+0.03 

+0.03 

+0.03 

+0.03 

+0.03 

+0.03 

+0.03 

-  2 

-  1 

-0.03 

-0.03 

-0.03 

-0.03 

-0.03 

-0.03 

-0.03 

-  1 

0 

-0.08 

-0.09 

-0.09 

-0.09 

-0.09 

-0.09 

-0.09 

0 

+  1 

-0.14 

-0.14 

-0.15 

-0.15 

-0.15 

-0.15 

-0.16 

+  1 

*  2 

0.20 

0.20 

0.21 

0.21 

0.21 

,  0.22 

0.22 

2 

3 

0.26 

0.26 

0.27 

0.27 

0.27 

0.28 

0.28 

3 

4 

0.31 

0.32 

0.32 

0.33 

0.33 

0.34 

0.35 

4 

5 

0.37 

0.37 

0.38 

0.39 

0.40 

0.40 

0.41 

5 

+  6 

-0.43 

-0.43 

-0.44 

-0.45 

-0.46 

-0.46 

-0.47 

+  6 

7 

0.48 

0.49 

0.50 

0.51 

0.52 

0.53 

0.53 

7 

8 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

0.60 

8 

9 

0.60 

0.61 

0.62 

0.63 

0.64 

0.65 

0.66 

9 

10 

0.65 

0.66 

0.68 

0.69 

0.70 

0.71 

0.72 

10 

+11 

-0.71 

-0.72 

-0.74 

-0.75 

-0.76 

-0.77 

-0.79 

+11 

12 

0.77 

0.78 

0.80 

0.81 

0.82 

0.84 

0.85 

12 

13 

0.82 

0.84 

0.85 

0.87 

0.88 

0.90 

0.91 

13 

14 

0.88 

0.90 

0.91 

0.93 

0.94 

0.96 

0.98 

14 

15 

0.94 

0.95 

0.97 

0.99 

1.00 

1.02 

1.04 

15 

+16 

-0.99 

-1.01 

-1.03 

-1.05 

-  .07 

-1.08 

-  .10 

+16 

17 

1.05 

1.07 

1.09 

1.11 

.13 

1.15 

.16 

17 

18 

1.11 

.13 

1.15 

.17 

.19 

1.21 

.23 

18 

19 

1.16 

.18 

1.21 

.23 

.25 

1.27 

.29 

19 

20 

1.22 

.24 

1.27 

.29 

.31 

1.33 

.35 

20 

+21 

-1.28 

-  .30 

-1.33 

-  .35 

-  .37 

-1.39 

-  .42 

+21 

22 

1.34 

.36 

1.38 

.41 

.43 

1.45 

.48 

22 

23 

1.39 

.41 

1.44 

.47 

.49 

1.52 

.54 

23 

24 

1.45 

.47 

1.50 

.53 

.55 

1.58 

.60 

24 

25 

1.50 

.53 

1.56 

.59 

.61 

1.64 

.67 

25 

126 


REDUCTION  OF  THE  OLD  FRENCH  BAROMETER  TO  THE  FREEZING  POINT. 

Normal  Temperature  of  the  Scale  =  13°  Reaumur. 


Attached 
Thermom- 
eter. 

Degrees  of 
Reaumur. 

Barometer  in  Paris  Lines. 

Attached 
Thermom- 
eter. 

Degrees  of 
Reaumur. 

315 

320 

325 

33O 

335 

340 

345 

0 

Par.  Lines. 

Par.  Lines. 

Par.  Lines 

Par.  Lines. 

Par.  Lines. 

Par.  Lines 

Par.  Lines 

c 

-15 

+0.86 

+0.88 

+0.89 

+0.90 

+0.92 

+0.93 

+0.95 

-15 

-14 

0.80 

0.81 

0.83 

0.84 

0.85 

0.86 

0.88 

-14 

-13 

0.74 

0.75 

0.76 

0.78 

0.78 

0.79 

0.81 

-13 

-12 

0.67 

0.68 

0.69 

0.70 

0.71 

0.73 

0.74 

-12 

-11 

0.61 

0.62 

0.63 

0.64 

0.65 

0.66 

0.67 

-11 

-10 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

0.60 

-10 

-  9 

+0.48 

+0.49 

+0.50 

+0.50 

+0.51 

+0.52 

+0.53 

-  9 

-  8 

0.42 

0.42 

0.43 

0.44 

0.44 

0.45 

0.46 

-  8 

-  7 

0.35 

0.36 

0.36 

0.37 

0.37 

0.38 

0.39 

-  7 

-  6 

0.29 

0.29 

0.30 

0.30 

0.31 

0.31 

0.32 

-  6 

-  5 

0.22 

0.23 

0.23 

0.24 

0.24 

0.24 

0.25 

-  5 

-  4 

+0.16 

+0.16 

+0.17 

+0.17 

+0.17 

+0.17 

+0.18 

-  4 

-  3 

0.10 

0.10 

0.10 

0.10 

0.10 

0.10 

0.11 

-  3 

-  2 

+0.03 

+0.03 

+0.03 

+0.03 

+0.03 

+0.03 

+0.04 

-  2 

-  1 

-0.03 

-0.03 

-0.03 

-0.03 

-0.03 

-0.03 

-0.03 

-  1 

0 

-0.10 

-0.10 

-0.10 

-0.10 

-0.10 

-0.10 

-0.10 

0 

+  1 

-0.16 

-0.16 

-0.16 

-0.17 

-0.17 

-0.17 

-0.17 

+  1 

2 

0.22 

0.23 

0.23 

0.23 

0.24 

0.24 

0.24 

2 

3 

0.29 

0.29 

0.30 

0.30 

0.31 

0.31 

0.31 

3 

4 

0.35 

0.36 

0.36 

0.37 

0.37 

0.38 

0.38 

4 

5 

0.42 

0.42 

0.43 

0.44 

0.44 

0.45 

0.45 

5 

+  6 

-0.48 

-0.49 

-0.49 

-0.50 

-0.51 

-0.52 

-0.53 

+  6 

7 

0.54 

0.55 

0.56 

0.57 

0.58 

0.59 

0.60 

7 

8 

0.61 

0.62 

0.63 

0.64 

0.65 

0.66 

0.67 

8 

9 

0.67 

0.68 

0.69 

0.70 

0.71 

0.72 

0.74 

9 

10 

0.74 

0.75 

0.76 

0.77 

0.78 

0.79 

0.81 

10 

+11 

-0.80 

-0.81 

-0.82 

-0.84 

-0.85 

-0.86 

-0.88 

+11 

12 

0.86 

0.88 

0.89 

0.90 

0.92 

0.93 

0.95 

12 

13 

0.93 

0.94 

0.96 

0.97 

0.99 

1.00 

1.02 

13 

14 

0.99 

1.01 

1.02 

1.04 

1.05 

1.07 

1.09 

14 

15 

1.05 

1.07 

1.09 

1.10 

1.12 

1.14 

1.16 

15 

+16 

-1.12 

-1.14 

-1.15 

-1.17 

-1.19 

-1.21 

-1.23 

+16 

17 

1.18 

1.20 

.22 

1.24 

1.26 

1.28 

1.30 

17 

18 

1.25 

1.27 

.29 

1.31 

1.33 

1.35 

1.37 

18 

19 

1.31 

1.33 

.35 

1.37 

.39 

1.41 

1.44 

19 

20 

1.37 

1.40 

.42 

1.44 

.46 

1.48 

1.51 

20 

+21 

-  .44 

-1.46 

-  .48 

-1.51 

-  .53 

-1.55 

-1.58 

+21 

22 

.50 

1.53 

.55 

1.57 

.60 

1.62 

1.65 

22 

23 

.57 

1.59 

.62 

1.64 

.67 

1.69 

1.72 

23 

24 

.63 

1.66 

.68 

1.71 

.73 

1.76 

1.79 

24 

25 

.69 

1.72 

.75 

1.78 

1.80 

1.83 

1.86 

25 

C 


127 


TABLES 


FOR     CORRECTING     THE 


DEPRESSION    OF   THE    BAROMETRICAL    COLUMN 


DUE   TO   CAPILLARY   ACTION. 


C  129 


CORRECTION  FOR  CAPILLARY  ACTION. 


IT  is  known  that  the  effects  of  capillary  action  are  not  the  same  in  different  liquids. 
In  a  tube  plunged  in  water,  the  liquid  in  the  tube  rises  higher  than  the  level  of  the 
water  in  the  vessel,  and  terminates  by  a  concave  surface,  which  is  called  a  concave 
meniscus.  In  a  tube  plunged  in  mercury  the  liquid  in  the  tube  stands  lower  than 
the  mercury  in  the  vessel,  and  terminates  by  a  convex  surface,  or  a  convex  meniscus. 
It  is  thus  evident  that  the  mercurial  column  in  the  tube  of  a  Barometer  does  not  rise 
to  its  true  height,  and  that  it  needs  to  be  corrected  for  the  depression  due  to  capil- 
larity, before  it  indicates  the  real  pressure  of  the  atmosphere. 

La  Place,  in  the  Mecanique  Celeste,  Tom.  IV.,  has  shown  that  the  value  of  that  cor- 
rection depends  upon  the  form  of  the  meniscus,  and  gave  a  formula  to  compute  it. 
As  this  form  varies  in  tubes  of  different  bores,  so  does  the  depression,  which  dimin- 
ishes as  the  diameter  of  the  tube  increases.  The  form  of  the  meniscus,  however, 
was  supposed  to  be  the  same  in  tubes  of  the  same  diameter,  and  constant  in  the  same 
tube ;  and  on  this  supposition  the  tables  generally  used  for  correcting  the  capillary 
action  have  been  computed.  But  more  accurate  observations  have  proved  that, 
owing  to  various  causes  not  yet  all  well  understood,  the  form  of  the  meniscus  is  often 
different  in  tubes  of  the  same  diameter,  and  that  it  is  even  variable  in  the  tube  of  the 
%same  instrument. 

It  thus  became  necessary  to  construct  new  tables,  taking  into  consideration,  in  a 
given  case,  both  the  diameter  of  the  tube  and  the  form  of  the  meniscus.  Such  tables, 
with  a  double  entry,  have  been  given  by  Schleiermacher,  in  the  Bibliotheque  Univer- 
selle  de  Geneve,  Tom.  VIII. ;  by  Bravais,  in  the  Anndles  de  Physique  et  de  Chimie, 
Tom.  V.  p.  508  ;  and  by  Delcros.  The  numbers  in  these  tables  agree  very  closely ; 
but  as  Delcros's  table  is  more  extended  than  that  of  Schleiermacher,  and  in  a  more 
convenient  form  than  that  of  Bravais,  it  is  given  below,  together  with  a  reduction 
of  it  to  English  measures,  for  the  ordinary  use. 

The  other  tables  may  serve  for  comparison. 

Table  XXII.,  from  the  Report  of  the  Committee  of  Physics  and  Meteorology  of 
the  Royal  Society  of  London,  1840,  gives  the  correction  to  be  applied  to  English 
barometers  for  capillary  action  in  boiled  and  unboiled  tubes.  It  takes  into  account 
the  diameter  of  the  tube,  but  not  the  variations  of  the  height  of  the  meniscus,  or  of 
the  convexity  which  terminates  the  barometrical  column.  This  last  element  is  sup- 
posed to  be  in  its  normal  state,  and  constant. 

Tables  XXIII.  and  XXIV.,  by  Delcros,  in  the  Annuaire  Meteor ologique  de  France, 
for  1849,  give  the  means  of  finding  the  true  correction  to  be  applied  to  metrical 
barometers  for  capillary  action. 

C  130 


CORRECTION    FOR    CAPILLARY   ACTION. 


The  first  shows  the  normal  height  of  the  meniscus  when  in  contact  with  the  air 
(as  is  the  case  in  the  inferior  branch  of  a  siphon  barometer),  and  in  the  barometric 
vacuum  at  the  top  of  the  column,  in  tubes  of  different  bores.  It  enables  the  observer 
to  judge  better  of  its  variations. 

Table  XXIV.  has  been  calculated  by  Delcros  after  the  formulas  of  Schleiermacher, 
making  the  constant  x  equal  to  6mm-.5278,  being  the  mean  value  between  that  of  Gay- 
Lussac  —  6mm'.5262,  and  that  of  Schleiermacher  =  6mm-.5295.  It  gives  the  amount 
of  the  capillary  action  in  millimetres  of  mercury,  taking  into  account  both  the  size 
of  the  bore,  or  the  internal  radius  of  the  tube,  which  will  be  found  in  the  vertical 
argument,  and  the  height  of  the  meniscus,  given  in  the  horizontal  argument.  The 
internal  radius  of  the  tube  is  supposed  to  be  known ;  the  height  of  the  meniscus,  or 
the  vertical  distance  from  the  base,  that  is,  from  the  sharp  line  where  the  mercury 
ceases  to  be  in  contact  with  the  walls  of  the  tube,  to  the  very  top  of  the  convexity, 
can  be  ascertained  by  measuring  it  several  times  by  means  of  the  vernier. 

Example :  —  Suppose  the  internal  radius  of  the  tube  to  be  3mm\2,  and  the  height 
of  the  meniscus  to  be  Omm-.8 ;  seek  in  the  first  vertical  column  the  number  3ram>.2  ; 
follow  then  the  horizontal  line  as  far  as  the  vertical  column  headed  Omm-.8,  you  find 
there  the  number  Omm>.776,  which  is  the  amount  of  the  depression  due  to  capillary 
action,  or  the  value  of  the  correction  to  be  added  to  the  observation. 

Table  XXV.  is  taken  from  Pouillet's  Elements  de  Physique,  Vol.  II.  p.  698  (1853). 

Table  XXVI.  is  found  in  Gehler's  Physicalische  Worterluch,  and  in  Schubarth, 
Physicalische  Tabellen,  p.  21. 

Table  XXVII. ,  which  is  Delcros's  table  reduced  into  English  measures,  gives  the 
means  of  correcting  with  more  accuracy  the  indications  of  the  English  barometers. 
For  its  use,  see,  above,  the  explanation  to  Table  XXIV. 

Table  XXVIII.  is  from  Baily's  Astronomical  Tables* 


XXII.  TABLE  FOR  THE   CORRECTION  TO 

BE  ADDED  TO  ENGLISH  BAROMETERS 

FOR  CAPILLARY  ACTION. 


XXIII.  TABLE  OF  THE  HEIGHT  OF  THE 

MENISCUS  OF  THE  BAROSIETRICAL 

COLUMN. 


Diameter 
of  Tube. 

Correction  for 

Unboiled 
Tubes. 

Boiled 
Tubes. 

Inch. 

Inch. 

Inch. 

0.60 

0.004 

0.002 

0.50 

0.007 

0.003 

0.45 

0.010 

0.005 

0.40 

0.014 

0.007 

0.35 

0.020 

0.010 

0.30 

0.028 

0.014 

0.25 

0.040 

0.020 

0.20 

0.060 

0.029 

0.15 

0.088 

0.044 

0.10 

0.142 

0.070 

Internal 

Normal  Height  of  the  Me- 
niscus in  Millimetres. 

Radius  of  the 

Tube  in 

Millimetres. 

In  the  Air. 

In  the 
Vacuum. 

1 

0.427 

0.34 

2 

0.795 

0.64 

3 

1.079 

0.86 

4 

1.287 

1.03 

5 

1.413 

1.13 

6 

1.488 

1.19 

7 

1.524 

1.22 

131 


XXIV.   DEPRESSION    OF    THE    BAROMETRICAL    COLUMN    DUE    TO    CAPILLARY   ACTION. 


.H^S  w 

O  CN  Tf  to  00 

O  Ol  Tf  CO  00 

0  CN  Tf  to  00 

0  CN  «*  tO  00 

O  Ol  Tf  tO  00 

0  CN  Tf  o  00 

p 

CN  CN  CN  CN  CN 

CO  CO  CO  CO  CO 

^^  ^^^ 

m  in  m  m  in 

to  to  to  to  to 

rc 

F? 

S* 

CO  tO  CO  Tf 
3     Tf  CO  CO  CO 

6666 

CO    0    rH    O    O 

!>•  Tf   CN   O  CO 
01  Ol   01   04  i-H 

66666 

S 

6 

i 

S 

-i 

B 

6 

o  m  o  co  TJ« 

OS  O  CO  to  O 

t-  r-  to  m  in 

66666 

CN  m  Tf  t^  Tf 

m  o  to  01  os 

Tf     Tf     CO     CO     01 

Tf     CO     Tf     CO     Tf 

tO    CO    rH    03   t^ 
CN    CN    Ol    rH    rH 

66666 

00 

in 
6 

i 

• 

|: 

1 

33333 

CO   in   O   rH 
CO  03  t~-  to 
3     CM  O  OS  00 

to  OJ  OS  ^f  O 

to  oo  o  -*  co 
t^  to  to  m  "t 

to  o  o  m  co 

CO    03    in    rH    CO 

Tf  CO  CO  CO   01 

Tf  03  tO  to  CO 

in  01  o  co  to 

CN    Ol    Ol    rH    i—  1 

66666 

01 

m 

6 

rH    rH   0   0 

o  o  o  o  o 

00000 

ght  of  the  Meniscus  in  Millimetres. 

H 

£ 

S3     3    3     3     3 

i 

00   CO   rH    00    -H 
rH   rH   rH   6  6 

co  t^  m  01  t^ 

co  m  co  01  to 
i--  to  m  m  Tf 

CO    -f   tO   rH    rH 

I-H  t^  co  O  r- 

Tf  CO  CO  CO  CN 

66666 

CO   05  t^  00   O 
Tf    r-l    03   1^    tO 
Ol    Ol    I-H    1—  1    1-H 

66666 

m 
6 

2 

£ 

S3     3333 

i 

3     3     3     3     in 

CN  tO  01  O  OS 

CO    rH    0    03   t^ 
rH   rH   rH    6    6 

t^  oo  03  os  in 
o  01  m  os  -^ 
t~*-  to  in  ^  ^* 

oo  to  os  t-~  t» 

os  m  •—  i  oo  m 

CO  CO  CO  01  01 

rH    CO   t^    OS   CO 

co  o  oo  to  m 

C^    C^l    rH    i-H    i—  i 

00 

CO 

6 

00000 

00000 

00000 

w 

JBJ 

1 

to  to 

-           V.           «•           *""*      *" 

i—  1    rH 

O  CN  to  O  O 

t~-    rH   t~-    tO    tO 
CN    rH   O5   00  t^. 
i-H  rH  6  6  6 

CO    t^*    rH    CO    Ol 

1^-  O5  CO  ^*  Ol 

o  in  m  -rji  TJI 
66666 

t^  t^   Ol   rH   CO 

r-  co  o  r>-  Tf 

CO  CO  CO  Ol  01 

OS  1^.  b-  O  Tf 

66666 

o 

CO 

6 

2 

£ 

S3     3     3     3     3 

i 

to  oo  CN 

to  o  os 

3     3     CO  to  CO 

O  t^  to  ^  oo 

CN  O  OS  CO  t>- 

m  co  o  m  i^ 
2  to  o  T»<  os 
in  m  -<t  co 

Tf  t^  Tf  m  co 

m  rH  co  m  CN 

CO  CO  CN  Ol  01 

in  m  to  o  m 
o  co  to  m  co 

rH 

6 

O  O  O  O  O 

o  o  o  o  o 

00000 

H 

J 

!•>-  O  00  00 

OO  CO  CN  I-H 

-    o  t^-  m  co 

CO   m    rH   -^    CO 
I-H  O5  CO  t^  to 

rn  6  6  6  6 

^  to  t^  to  o 

03    01    tO   rH  ^ 

in  in  ^  -^  co 

o  m  Tf  t^  co 

CO    03    tO    CO    rH 

CO  Ol  Ol  CN  CN 

rH   Ol    Tf   03    tO 

03  *-  m  co  01 

6 

i 

o  o  o  o  o 

O  O  O  O  O 

00000 

0 

oj 

S3     3     3     3     3 

oo  oo  o  to  m 

Tf  I-  00  CO  CO 

CO  OS  CO  Tf  Ol 

CO  00  O  O  ^ 
tO  Ol  i—  i  rH  Ol 

O  O3  OO  t^-  tO 

m  oo  co  oo  •* 
m  TJ<  TJ<  co  co 
06666 

m  01  Tf  co  to 

O  1--    Tf    rH   OS 
CO    Ol    Ol    01    rH 

6«6  666 

tO  CO  CN  CO  O 

t^   in    Tf    01    rH 

in 

0 

rH 

6 

S 

I-H  O  O  O  O 

66666 

es 
o 

J            S 

S3     3     3     3     tO 
§                             CN 

os  rH  m  01  CN 

m  m  in  01  01 

^f  to  m  I-H  01 

00  00  CN  O5  CO 

STf  o  i^  m 
Tf    CO    rH    O 

in 

o 
6 

CN   l-H   rH   l-H   rH 

o  o  o  o  o 

66666 

o  o  o  o  o 

o  o  o  o  o 

OK) 

o 

e                   O  CO 
.5                m  oo 

to  m  to  oo  rH 

Tf     O     CO     r-     Tf 

0  1^  Tf  01  0 

to  to  m  o  t>. 

03    t^  t-    03    rH 

oo  t^  to  m  m 

in    Ol   tO   tO    rH 

m  o  in  rH  oo 

T}<    T*    CO    CO    01 

8S8S8 

Tf  os  to  m  m 

Tf    01   rH    O    03 

m 

§ 

6 

W 

S                    COCN 

00000 

o  o  o  o  o 

00000 

p 

£                CN  CN  O 
53     3     in  00  CN 
g               CO  CN  CN 

03    rH    01    CO    01 

m  Tf  os  os  co 
oo  in  CN  p  C5 

§rH   rH   -r>   OS 
os  o  01  m 
to  to  o  rj< 
66666 

ri<  to  m  o  os 

O  in  I-H  oo  rf 
-*  CO  CO  CN  CN 

rH    00  t^   CO    CN 

CN  os  r-  m  Tf 

!>•  Tf  CO  CO  Tf 
01  I-H  O  03  CO 

m 

p 

6 

00000 

00000 

o  o  o  o  o 

o' 

d      o  oo  oo  Tf 

.£         03  rH  CN  CN 

oo  o  m  oo  m 

Tf  co  co  m  I-H 

tO  CO  I-H  O5  00 

oo  01  co  m  C5 

os  o  01  in  os 
to  to  m  ^t  co 

o  03  co  01  m 

in    O   t^-    f    rH 

CO  CO  Ol  CN  Ol 

66666 

CN    rH    CO  t^   01 

os  t--  m  co  01 

O  OS  05  O  CN 
rH   O5   CO   OP  t^» 
rH    O   O    O    O 

66666 

m 

CO 

6 

g         Tf  CO  CN  CN 

rH    rH    rH    0    0 

00000 

00000 

3 

JS^ololS 

CO    rH    tO    CO    rH 
rH    tO    tO    -H    OS 
Tf    l-H    O3    00    tO 

rH  OS  -H  -*  tO 
03  O  rj<  00  CO 

,m  m  ^t  co  co 

in    O    O    •**<    rH 

66666 

I-H  Tf  oo  m  co 

tO  Tf  CN  i—  i  O 

Ol    CO   Tf  t^    rH 

OS  OO  t—  tO  tO 

p  p  p  p  p 
66666 

m. 
6 

§  in  co  CN  CN  I-H 

rH  i-l  O   O  O 

00000 

00000 

o 

d  to  CN  co  O  i^ 
.r  os  to  to  CN  co 

00  00  1^  -H  O 

m  Tf  oo  to  to 
rn  os  r-  to  m 

.•H  6  6  6  6 

oo  01  to  o  -H 

Tjj  ^  CO  CO  01 

co  o  in  Tf  to 

CO    rH    00    tO    Tf 

o  to  co  01  co 

CO   rH    O   03    CO 

r^.  co  to  m  Tf 

o  o  o  o  o 
66666 

o 
6 

g  Tf   CO    <N   rH    rH 

00000 

00000 

w 

£  CO  Tf  CO  Tf  CO 

•-    rH    00    CO     O    O 

:-i  o  Tf  oo  Tf  i—  i 

GO  t-  m  m  Tf 

01  01  os  TJ<  m 

CO  CO  Ol  01  01 

O  00  O  Tf  O 

oo  m  -<f  01  •—  i 

00  t^  OO  O  01 
OS  CO  r~  ^  tO 

66666 

to  o  m  rH  t^ 

m  m  "f  "t  co 
o  o  o  o  o 
66666 

1 
6 

00000 

00000 

00000 

o 

£  o  m  to  m  t^ 
~  to  rH  m  o  Tf 

oo  t^  co  i^  m 

OS  00  O  CO  00 

in  Tf  Tf  co  CN 

00000 

•^  o  oo  in  co 

O     tO     Tf     CO     Tf 

Ol  O  OS  CO  t-- 

m  co  CN  i^  01 

to  m  in  Tf  Tf 

1^    Tf    O    t-    Tf 

CO  CO  CO   01  01 

o  o  o  o  o 

Ol 
01 

o 
6 

goirnrHOO 

00000 

00000 

o  o  o  o  o 

o 

£  00  tO  OO  -f  00 

01  m  co  o  co 

O  Tf  O  *••  Tf 

CO    01    CN    rH    rH 

04   in   rH   OS   O3 
Ol  O  OS  l~-  to 

rH    rn   0    0    0 

O  co  t^  01  r^ 

to  m  Tf  Tf  co 

co  os  to  co  I-H 

§§§§§ 

66666 

os  t^  m  Tf  01 

o 
6 

S  01  CO  tO  Tf  CO 

00000 

66666 

g  rH  O  O  O  O 

00000 

00000 

00000 

°lss 

O  Ol  Tf  CO  00 

O  CN  Tf  to  00 

O  <M  T*  tO  00 

CO  CO  CO  CO  CO 

O  CN  Tf  co  CO 

O  CN  •*  tO  00 

p  Ol  Tf  to  00 

to  to  to  to  to 

p 

132 


XXV.       DEPRESSION    OF    THE    BAROMETRICAL    COLUMN    DUE    TO    CAPILLARY    ACTION. 

FROM  POUILLET. 


Internal 
Diameter 
of  Tube. 

i   Depression. 

Differences. 

Internal 
Diameter 
of  Tube. 

Depression. 

Differences. 

Internal 
Diameter 
of  Tube. 

Depression. 

Differences. 

Millimetres.    Millimetres. 

Millimet. 

Millimetres. 

Millimetres. 

Millimet. 

Millimetres. 

Millimetres. 

Millimet. 

2.00 
2.50 
3.00 
3.50 
4.00 

4.579 
3.595 
2.902 
2.415 
2.053 

0.985 
0.692 
0.487 
0.362 
0.301 

8.50 
9.00 
9.50 
10.00 
10.50 

0.604 
0.534 
0.473 
0.419 
0.372 

0.070 
0.061 
0.054 
0.047 
0.042 

15.00 
15.50 
16.00 
16.50 
17.00 

0.127 
0.112 
0.099 
0.087 
0.077 

0.015 
0.013 
0.012 
0.010 
0.009 

4.50 
5.00 
5.50 
6.00 
6.50 

1.752 
1.507 
1.306 
1.136 

0.995 

0.245 
0.201 
0.170 
0.141 
0.118 

11.00 
11.50 
12.00 
12.50 
13.00 

0.330 
0.293 
0.260 
0.230 
0.204 

0.037 
0.033 
0.030 
0.026 
0.023 

17.50 
18.00 
18.50 
19.00 
19.50 

0.068 
0.060 
0.033 
0.047 
0.041 

0.008 
0.007 
0.006 
0.006 
0.005 

7.00 
7.50 
8.00 

0.877 
0.775 
0.684 

0.102 
0.091 
0.080 

13.50 
14.00 
14.50 

0.181 
0.161 
0.143 

0.020 
0.018 
0.016 

20.00 
20.50 
21.00 

0.036 
0.032 
0.028 

0.004 
0.004 

XXVI.   DEPRESSION  OF  THE  BAROMETRICAL  COLUMN  DUE  TO  CAPILLARY  ACTION. 

Internal 
Diameter 
of  Tube. 

Depression  according  to 

Internal 
Diameter 
of  Tube. 

Depression  according  to 

La  Place. 

Young. 

Ivory. 

Cavendish. 

La  Place. 

Young. 

Ivory. 
Millim. 

Cavendish. 

Millimetres. 

Millim. 

Millim. 

Millim. 

Millim. 

Millimetres. 

Millim. 

Millim. 

Millie, 

2.00 

4.454 

4.887 

4.888 

4.472 

11.50 

0.315 

2.50 

3.568 

12.00 

0.281 

0.242 

0.253 

0.200 

3.00 

2.918 

2.986 

2.988 

3.054 

12.50 

0.250 

3.50 

2.442 

13.00 

0.223 

0.188 

0.196 

0.170 

4.00 

2.068 

2.063 

2.066 

2.187 

13.50 

0.198 

4.50 

1.774 

14.00 

0.176 

0.144 

0.152 

0.150 

5.00 

1.534 

1.510 

1.513 

1.735 

14.50 

0.156 

5.50 

1.337 

15.00 

0.137 

0.111 

0.118 

0.131 

6.00 

1.171 

1.139 

1.134 

1.377 

15.50 

0.121 

6.50 

1.030 

16.00 

0.107 

0.088 

0.087 

7.00 

0.909 

0.869 

0.868 

1.073 

16.50 

0.094 

7.50 

0.803 

17.00 

0.083 

0.068 

0.071 

8.00 

0.712 

0.669 

0.673 

0.820 

17.50 

0.073 

8.50 

0.632 

18.00 

0.064 

0.053 

0.054 

9.00 

0.562 

0.517 

0.521 

0.608 

18.50 

0.056 

9.50 

0.500 

19.00 

0.049 

0.041 

0.042 

10.00 

0.445 

0.402 

0.406 

0.406 

19.50 

0.043 

10.50 

0.397 

20.00 

0.038 

0.031 

0.031 

11.00 

0.354 

0.311 

0.316 

0.270 

20.50 

0.034 

11.50 

0.315 

21.00 

0.030 

0.024 

0.024 

133 


XXVII.       DEPRESSION    OF    THE    BAROMETRICAL    COLUMN    DUE    TO    CAPILLARY   ACTION, 
REDUCED    INTO    ENGLISH    INCHES    FROM    DELCROs's    TABLE. 


Internal 
Diam- 
eter 

Height  of  Meniscus  in  Thousandths  of  an  English  Inch. 

of 

5 

Tube. 

10 

15 

20 

25 

30 

35 

40 

45 

50 

55 

60 

65 

70 

Eng.  In. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

0.10 

0.040 

0.076 

0.109 

0.136 

0.155 

0.12 

.027 

.053 

.076 

.097 

.114 

0.14 

.019 

.038 

.056 

.071 

.085 

0.097 

0.16 

.015 

.029 

.042 

.055 

.066 

.076 

0.084 

0.18 

.011 

.022 

.033 

.043 

.052 

.060 

.067 

0.073 

0.20 

.009 

.018 

.026 

.034 

.042 

.049 

.055 

.060 

0.064 

0.22 

.007 

.014 

.021 

.028 

.034 

.040 

.045 

.049!  .053 

0.057 

0.24 

.006 

.012 

.017 

.023 

.028 

.033 

.037 

.041 

.045 

.048 

0.050 

0.26 

.005 

.010 

.014 

.019 

.023 

.027 

.031 

.035 

.038 

.040 

.043 

0.045 

0.28 

.004 

.008 

.012 

.016 

.019 

.023 

.026 

.029 

.032 

.034 

.036 

.038 

0.30 

.003 

.007 

.010 

.013 

.016 

.019 

.022 

.025 

.027 

.029 

.031 

.033 

0.034 

0.32 

.003 

.006 

.009 

.011 

.014 

.016 

.019 

.021 

.023 

.025 

.027 

.028 

.030 

0.34 

.002 

.005 

.007 

.010 

.012 

.014 

.016 

.018 

.020 

.022 

,023 

.024 

.026 

0.36 

.002 

.004 

.006 

.008 

.010 

.012 

.014 

.016 

.017 

.019 

.020 

.021 

.022 

0.38 

.002 

.004 

.005 

.007 

.009 

.010 

.012 

.013 

.015 

.016 

.017 

.018 

.019 

0.40 

.002 

.003 

.005 

.006 

.008 

.009 

.010 

.012 

.013 

.014 

.015 

.016 

.017 

0.42 

.001 

.003 

.004 

.005 

.007 

.008 

.009 

.010 

.011 

.012 

.013 

.014 

.015 

0.015 

0.44 

.001 

.002 

.004 

.005 

.006 

.007 

.008 

.009 

.010 

.011 

.011 

.012 

.013 

.013 

0.46 

.001 

.002 

.003 

.004 

.005 

.006 

.007 

.008 

.008 

.009 

.010 

.011 

.011 

.012 

0.48 

.001 

.002 

.003 

.004 

.004 

.005 

.006 

.007 

.007 

.008 

.009 

.009 

.010 

.010 

0.50 

.001 

.002 

.002 

.003 

.004 

.004 

.005 

.006 

.006 

.007 

.008 

.008 

.008 

.009 

0.52 

.001 

.001 

.002 

.003 

.003 

.004 

.005 

.005 

.006 

.006 

.007 

.007 

.007 

.008 

0.54 

.001 

.001 

.002 

.002 

.003 

.003 

.004 

.004 

.005 

.005 

.006 

.006 

.006 

.007 

5 

10 

15 

20 

25 

30 

35 

40 

45 

50 

55 

60 

65 

70 

i 

XXVIII 

.       DEPRESSION    OF    THE    BAROMETRICAL    COLUMN    DUE    TO    CAPILLARY 

ACTION,    EXPRESSED    IN    ENGLISH    INCHES.  BAILY. 

Depression  according  to                                                           Depression  according  to 

Diameter 

Diameter 

of  Tube. 

of  Tube. 

Ivory. 

Young. 

La  Place.                                      Ivory.              Young. 

La  Place. 

Eng.  Inch. 

Eng.  Inch. 

Eng.  Inch. 

Eng.  Inch.          Eng.  Inch.        Eng.  Inch.       Eng.  Inch. 

Eng.  Inch. 

0.05 

0.2949 

0.2964 

0.  ...              0.35            0.0212          0.0196 

0.0216 

0.10 

.1404 

.1424 

.1394              0.40              .0154            .0139 

.0159 

0.15 

.0865 

.0880 

.0854              0.45               .0112            .0100 

.0117 

0.20 

.0583 

.0589 

.0580              0.50               .0082            .0074 

.0087 

0.25 

.0409 

.0404 

.0412               0.60              .0043            .0045 

.0046 

0.30 

.0293 

.0280 

.0296              0.70              .0023            .... 

.0024 

0.35 

0.0212 

0.0196 

0.0216              0.80            0.0012          0.  ... 

0.0013 

134 


METEOROLOGICAL    TABLES 


IV. 


HYPSOMETRICAL   TABLES. 


CONTENTS. 


(The  figures  refer  to  the  folio  at  the  bottom  of  the  page.) 

1.  BAROMETRICAL  MEASUREBIENT  OF  HEIGHTS. 

Page 

On  the  Tables  and  Formula          ..,.....,  9 

Tables  "based  on  Laplace's  Constants. 

TABLE       I.  Delcros's  Tables,  in  Metrical  Measures         .         .         .         .         .11 

"          II.     Guyot's  Tables,  in  English  Measures 33 

III.  Loomis's  Tables,  in  English  Measures          .         .         .         .         .49 

"        IV.  Gauss's  Tables,  modified  by  Dippe,  Old  French  Measures           .         54 

V.  Dippe's  Tables,  for  reducing  Barometrical  Observations  to  another 

Level,  and  for  computing  Heights,  Old  French  Measures  .     60 

"        VI.  Babinet's  Modification  of  Laplace's  Formula     ....         68 

"       VII.     Baily's  Tables,  in  English  Measures 69 

Tables  based  on  Bessel's  Formula. 
"      VIII.     Plantamour's  Tables,  in  Metrical  Measures        ....         72 

Miscellaneous  Tables. 
• 

IX.     Correction  for  the  Hour  of  the  Day  at  which  the  Observations  have 

been  taken,  Coefficients  by  Berghaus        .         .         .         .         .80 
Correction  for  the  Hour  of  the  Day,  Old  French  Measures         .         81 
Correction  to  be  applied  to  the  Half-Sums  of  the  Temperatures 
observed  at  Geneva  and  St.  Bernard,  and  its  Value  in  Metres  at 
all  Hours  and  Seasons  of  the  Year,  by  Plantamour             .         .     82 
Computing  Altitudes  by  the  Height  of  the  Barometer  at  the  Sea- 
Level          83 

"       XII.     Mean  Height  of  the  Barometer  at  the  Level  of  the  Sea  in  various 

Latitudes    .         .         .         .         .         .         .         .         .         .         85 

"      XIII.     Mean  Height  of  the  Barometer  in  all  Months  of  the  Year       .         .     86 
"      XIV.     Mean  Height  of  the  Barometer  at  all  Hours  of  the  Day      .         .         86 
"       XV.     Tropic  Hours  of  Daily  Variation  at  Halle     .         .         .         .         .87 

Reducing  the  Barometer  to  the  Level  of  the  Sea        ...         88 
"      XVI.     Height,  in  English  Feet,  of  a  Column  of  Air  corresponding  to  a 

Tenth  of  an  Inch  in  the  Barometer  .         .         .         .         .89 

"    XVII.     Height,  in  French  Feet,  of  a  Column  of  Air  corresponding  to  a 

Paris  Line  in  the  Barometer        ......         89 

D  3 


CONTENTS. 


TABLE  XVIII.     Height,  in   Metres,   of  a  Column    of  Air  corresponding  to  a 
Millimetre  in  the  Barometer     ...... 

XIX.     Height,  in  Metres,  of  a  Column   of  Air   corresponding   to  a 
Millimetre   in  the  Barometer  at  different  Temperatures  and 
Elevations      ......... 

XX.     Correction  to  be  applied  to  the  Means  of  the  Hours  of  Obser- 
vation  to    obtain    the    True   Mean   Barometrical   Pressure, 
Philadelphia    ......... 

XXI.     Correction  to  be  applied  to  the   Means  of  the   Hours  of  Ob- 
servation to  obtain   the  True  Mean  Barometrical  Pressure, 
Greenwich      ......... 

XXII.     For  reducing  Minutes  into  Decimals  of  an  Hour 
"        XXIII.     Correction  for  Curvature  and  Refraction 


Page 


89 


91 


92 


93 
94 
95 


2.  THERMOMETRICAL  MEASUREMENT  OF  HEIGHTS. 

XXIV.  Regnault's  Barometric  Pressures  corresponding  to  the  Tempera- 

ture of  Boiling  Water 98 

XXV.  Regnault's  Barometric  Pressures  corresponding  to  the  Tempera- 

ture of  Boiling  Water,  revised  by  Moritz,  in  Metrical  Measures  102 
XXVI.     Regnault's  Barometric  Pressures  corresponding  to  the  Tempera- 
ture of  Boiling  Water,  revised  by  Moritz,  in  English  Measures  104 


TABLE 
ft 


3.  APPENDIX  TO  THE  HYPSOMETRICAL  TABLES. 

Comparison  of  the  Measures  of  Length  most  generally  used  for  indicating 
On  the  Various  Standards  of  Measure,  and  their  Relations 

For  converting  French  Toises  into  different  Measures. 
I.     Conversion  of  French  Toises  into  Metres 
II.     Conversion  of  French  Toises  into  Paris  Feet 
Conversion  of  French  Toises  into  English  Feet 
Conversion  of  French  Toises  into  American  Feet 

For  converting  Metres  into  different  Measures. 

V.     Conversion  of  Metres  into  Toises    ..... 

Conversion  of  Metres  into  Paris  Feet          .... 
VII.     Conversion  of  Metres  into  English  Feet 
VIII.     Conversion  of  Metres  into  American  Feet  .... 
Conversion  of  Metres  into  Rhine  or  Prussian  Feet  . 


III. 
IV. 


VI. 


IX. 

For  converting  Paris  Feet  into  different  Measures. 
X.     Conversion  of  Paris  Feet  into  Toises  . 
XI.     Conversion  of  Paris  Feet  into  Metres 
XII.     Conversion  of  Paris  Feet  into  English  Feet 
XIII.     Conversion  of  Paris  Feet  into  American  Feet 

4 


Altitudes. 
.     109 

114 
.  114 

115 
.  115 

116 

117 

120 

.  128 

128 

.  129 
130 

.  131 
132 


CONTENTS. 

For  converting  English  Yards  and  Feet  into  different  Measures. 

Page 

TABLE      XIV.     Conversion  of  English  Yards  into  French  Toises     .         .         .  133 

"           XV.     Conversion  of  English  Yards  into  Metres     ....  133 

"          XVI.     Conversion  of  English  Feet  into  Metres 134 

"         XVII.     Conversion  of  English  Feet  into  Paris  Feet          ...  135 

"       XVIII.     Conversion  of  English  Feet  into  American  Feet      .         .         .  136 

"          XIX.     Differences  between  English  and  American  Feet          .         .  136 

For  converting  American'  Yards  and  Feet  into  different  Measures. 

"            XX.     Conversion  of  American  Yards  into  French  Toises           .         .  137 

XXI.     Conversion  of  American  Yards  into  Metres           .         .         .  137 

XXII.     Conversion  of  American  Feet  into  Metres        ....  138 

"        XXIII.     Conversion  of  American  Feet  into  Paris  Feet      .         .         .  139 

For  converting  Klafter  and  Feet  of  Vienna  into  different  Measures. 

"       XXIV.     Conversion  of  Klafter  of  Vienna  into  Toises    .         .         .         .140 

XXV.     Conversion  of  Klafter  of  Vienna  into  Metres         .         .  141 

"       XXVI.     Conversion  of  Klafter  of  Vienna  into  Paris  Feet       .         .         .  141 

"      XXVII.     Conversion  of  Klafter  of  Vienna  into  English  Feet       .         .  142 

"     XXVIII.     Conversion  of  Feet  of  Vienna  into  Metres       ...         .         .  142 

"        XXIX.     Conversion  of  Feet  of  Vienna  into  Paris  Feet       .         .         .  143 
u         XXX.     Conversion  of  Feet  of  Vienna  into  English  Feet      .         .         .143 

For  converting  Rhine  or  Prussian  Feet  into  different  Measures. 

"        XXXI.     Conversion  of  Rhine  Feet  into  French  Toises      ...  144 

"      XXXII.     Conversion  of  Rhine  Feet  into  Metres 145 

"     XXXIII.     Conversion  of  Rhine  Feet  into  Paris  Feet    ....  145 

"     XXXIV.     Conversion  of  Rhine  Feet  into  English  Feet  ....  145 

For  converting  Spanish  or  Mexican  Varas  and  Castilian  Feet  into  different  Measures. 

"      XXXV.     Conversion  of  Spanish  Varas  into  Metres     ....  146 

"     XXXVI.     Conversion  of  Spanish  Varas  into  English  Feet       .         .         .  146 

"    XXXVII.     Conversion  of  Castilian  Feet  into  Metres     ....  147 

"  XXXVIII.     Conversion  of  Castilian  Feet  into  Paris  Feet    .         .         .         .  147 

"     XXXIX.     Conversion  of  Castilian  Feet  into  American  Feet          .         .  147 

For  converting  Fractional  Parts  of  a  Tdise  and  of  a  Foot  into  each  other. 

"            XL.     Conversion  of  Inches  into  Duodecimal  Lines   ....  148 

XLI.     Conversion  of  Decimals  of  a  Toise  into  Feet  and  Inches       .  148 

"         XLII.     Conversion  of  Decimals  of  a  Foot  into  Inches  and  Decimals     .  149 
-  "        XLIII.     Conversion  of  Decimals  of  a  Foot  into  Inches  and  Duodecimal 

Lines 149 

"        XLIV.     Conversion  of  Duodecimal  Lines  into  Decimals  of  a  Foot      .  149 

D  5 


BAROMETRICAL 


MEASUREMENT    OF     HEIGHTS, 


OR 


TABLES 


FOR    COMPUTING   DIFFERENCES    OF    ELEVATION    FROM    BAROMETRICAL 

OBSERVATIONS. 


I) 


HYPSOMETKECAL    TABLES 

FOR 

COMPUTING   DIFFERENCES    OF    ELEVATION   FROM   BAROMETRICAL 

OBSERVATIONS. 


NUMEROUS  determinations  of  altitude  are  one  of  the  great  desiderata  of  physical 
science,  and  no  more  ready  means  for  obtaining  them  is  at  the  disposal  of  the  scien- 
tific man  than  the  Barometer.  A  traveller,  furnished  with  the  improved  and  con- 
venient  instruments  we  can  now  command,  and  with  some  experience  in  using  them, 
can  take  a  large  number  of  barometric  observations  for  determining  heights,  at  the 
cost  of  little  trouble  or  time.  It  is,  however,  quite  otherwise  with  the  computations 
by  which  the  results  are  obtained.  The  prospect  of  that  tedious  and  time-robbing 
labor  not  only  too  often  cools  the  zeal  of  the  observer,  but  a  vast  amount  of  data 
actually  collected  remain  of  no  avail  from  the  want  of  having  been  computed. 

The  object  of  this  much  enlarged  set  of  Hypsometrical  Tables  is  to  facilitate  the 
task  of  the  computer.  It  contains  practical  tables  adapted  to  the  three  usual  baro- 
metrical scales,  and,  among  them,  No.  I.,  II.,  and  V.  are  so  disposed  as  to  dispense 
with  the  use  of  logarithms,  and  to  reduce  the  computation  to  the  simplest  arithmeti- 
cal operations.  The  others  suppose  the  use  of  logarithms,  a  method  which  may  still 
be  preferred  by  some  observers. 

As  these  various  tables  represent  the  development  of  the  principal  formulae  which 
have  been  proposed,  the  computer  is  enabled  to  compare  the  results  obtained  by 
each  of  them,  and  to  select  that  which  he  most  approves. 

These  formulae  may  be  referred  to  two  classes,  the  respective  types  of  which  are 
Laplace's  and  BessePs  formulae. 

Laplace,  in  the  Mecanique  Celeste,  Tom.  IV.  p.  292,  gave  a  complete  solution  of 
the  problem,  and  proposed  a  formula  which  soon  superseded  the  older  and  less  accu- 
rate formulas  of  De  Luc,  Shuckburgh,  and  others.  The  coefficients  which  enter  in  it 
were  derived  from  the  best  determinations  of  the  needed  physical  constants  which 
science  could  then  furnish,  the  most  important  of  which  are  the  relative  weight  of 
the  air  and  of  the  mercury,  and  the  rate  of  expansion  oil  air  by  heat.  The  first  was 
assumed  to  be  TTy£5T,  according  to  the  experiments  of  Biot  and  Arago ;  and  the  ba- 
rometrical coefficiency  deduced  from  it,  18317  metres.  This  coefficient  was,  how- 
ever, empirically  increased  to  18336  metres,  in  order  to  adjust  the  results  of  the 
formula  to  those  furnished  by  the  careful  trigonometrical  measurements  made  by 
Ramond  for  the  purpose  of  testing  its  correctness.  It  becomes  18393  metres  when 
including  the  correction  due  to  the  effect  of  the  decrease  of  gravity  with  the  height 
oh  the  density  of  the  mercurial  column  and  of  the  air.  The  coefficient  expressing 
the  expansion  of  the  air  by  heat,  as  determined  by  Gay-Lussac,  viz.  0.00375  of  its 
bulk  for  one  Centigrade  Degree,  was  adopted,  but  Laplace  increased  it  to  0.004,  in 
order  to  take  into  the  account  the  effect  of  the  greater  expansive  power  of  the  vapors 
contained  in  the  atmosphere. 

D  9 


IIYPSOMETRICAL    TABLES. 

These  values  have  been  retained  in  the  different  formulae  proposed  later  by  Gauss, 
in  Schumacher's  Jalirlucli  for  1840,  by  Schmidt,  Mathem.  und  Physische  Geographic, 
II.  p.  205,  and  by  Baily,  Astronomical  Tables,  p.  183,  which,  therefore,  only  change 
the  form  without  changing  the  results.  D'Aubuisson,  in  his  formula  and  tables,  Traite 
de  Geognosie,  p.  488,  only  reduced  the  barometrical  coefficient  to  its  theoretical 
value,  which  he  determined  to  be  18365  metres,  leaving  unchanged  the  other  coeffi- 
cients of  Laplace's  formula. 

Bessel  first  introduced,  in  his  formula,  Astronomische  Nachrichten,  No.  356,  a  sep- 
arate correction  for  the  effect  of  moisture.  The  correction  for  the  temperature  of 
the  air  is  computed  in  his  tables  for  two  values  of  the  coefficient,  that  of  Gay-Lussac, 
0.00375,  and  that  of  Rudberg,  0.00365,  Laplace's  barometrical  coefficient  is  re- 
tained, but  the  correction  for  the  decrease  of  gravity  is  considerably  modified. 

In  Elie  Ritter's  formula,  in  the  Memoires  de  la  Societe  de  Physique  de  Geneve, 
Tom.  XIII.  p.  343,  the  corrections  for  temperature  and  moisture  are  also  separated ; 
but  other  values  of  the  barometrical  and  thermometrical  coefficients,  derived  from 
Regnault's  determinations,  are  used,  and  a  new  method  is  proposed  for  applying  the 
correction  due  to  the  expansion  of  air,  which  is  made  proportional  to  the  square  of 
the  difference  between  the  observed  temperatures  at  each  station. 

Baeyer's  formula,  recently  published  in  Poggendorf 's  Annalen  der  Physik  und 
Chemie,  Tom.  XCVIII.  p.  371,  does  not  belong  to  either  of  the  two  classes  just  men- 
tioned ;  for  while  it  keeps  Laplace's  barometrical  and  thermometrical  coefficients,  it 
corrects  the  effect  of  temperature  by  a  method  analogous  to  that  of  Ritter,  and  it  en- 
tirely neglects  the  effect  of  aqueous  vapor. 

In  the  following  set  the  tables  of  Delcros,  Guyot,  and  Loomis  develop  the  formula 
of  Laplace.  The  much  larger  tables  of  Delcros  render  unnecessary  those  of  Olt- 
manns,  which  are  yearly  reprinted  in  the  Annuaire  du  Bureau  des  Longitudes.  In- 
stead of  Gauss's  tables  will  be  found  the  tables  of  Dippe,  which  are  computed  from 
the  same  formula,  but  are  more  extended.  Baily's  tables  close  the  first  series.  The 
tables  of  Plantamour,  computed  from  Bessel's  formula,  are  given  here  in  preference  to 
Bessel's  tables,  because  Plantamour  substituted  for  Laplace's  barometrical  coefficient 
that  derived  from  the  probably  more  accurate  determination  of  the  relative  weight 
of  the  air  and  mercury  by  Regnault,  viz.  18404.8  metres.  E.  Ritter's  tables,  com- 
puted from  his  own  formula,  give  perhaps,  in  extreme  cases,  better  results  ;  but 
as,  in  ordinary  circumstances,  the  altitudes  obtained  do  not  much  differ  from  those 
furnished  by  the  less  complicated  tables  of  Plantamour,  they  were  not  reprinted 
here. 

The  miscellaneous  tables  which  follow  furnish  useful  materials  for  solving  several 
questions  connected  with  the  barometrical  measurements. 

Regnault's  table  of  Barometric  Pressures  corresponding  to  Temperatures  of  the 
Boiling  Point  of  Water,  revised  by  Moritz,  and  its  reduction  to  English  measures,  will 
be  found  a  valuable  addition  for  thermometrical  measurements  of  height. 

The  Appendix  to  the  Hypsometrical  Tables  now  offers,  in  a  new  form,  a  complete 
series  of  tables  for  the  comparison  of  the  different 'measures  of  length  generally  used 
for  indicating  altitudes,  the  convenience  of  which  will  be  fully  appreciated  by  those 
who  have  attempted  to  collect  and  to  use  the  abundant  contributions  furnished  by  all 
civilized  nations  to  that  branch  of  geographical  science. 

D  10 


I. 


TABLES 


FOR 


DETERMINING  DIFFERENCES   OF  LEVEL  BY  MEANS  OF 
BAROMETRICAL  OBSERVATIONS, 

COMPUTED  FROM  THE  COMPLETE  FORMULA  OF  LAPLACE, 
BY  M.  T.  DELCKOS. 


Construction  of  the  Tables. 

If  we  take  %  =  difference  of  level  of  the  two  barometers, 
a  —  earth's  mean  radius  =  6366200  metres, 
L  =  mean  latitude  between  the  two  stations, 


and  further :  — 


At  Station. 


rt- 

r,- 


Upper. 


=  observed  height  of  the  barometer, 
Lower.    ^   T  =  temperature  of  the  barometer, 

temperature  of  the  air, 
h'  =  observed  height  of  the  barometer, 
T'  =  temperature  of  the  barometer, 
C    tf  =  temperature  of  the  air, 
and  if  we  make  finally  H  =  h  -[-  h1.  (^^-'), 

we  shall  have,  according  to  Laplace,  the  following  general  and  complete  equation 

/ -.     ,    2.  (<-HO\ 

(l  +-100^; 

(  1  +  0.0028371  cos.  2.  L) 
((1  +  £).    Log.  (A)  +  JL  0.868589) 
after  the  proper  transformations  this  equation  becomes :  — 

(-t      i     2.  (?+  fQ\ 
1  "i     IOOQ— ; 

(  1  +  0.0028371  cos.  2.  L) 

(log-  (ir)  +  0.868589) .  ~ 


z  =  18336  metres  X 


x  =  Log. 


18336  metres  X 


( 


D 


11 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

introducing  into  this  expression  the  value  in  metres  of  a,  the  earth's  mean  radius, 
making  2  =  Log.  (^-)  18336  and  Log.  (-^)  =  (j^g) ,  which  can  be  done  without 
sensible  error,  the  above  formula  takes  the  following  form,  sufficiently  accurate  for 
practical  purposes  :  — 


z  =  Log.  (4).  18336  metres  X    \    (1  +  0.0028371  cos.  2.  L) 


the  four  factors  of  which  can  easily  be  developed  in  tables,  as  has  been  done  by  Mr. 
Oltmanns.  But  though  this  savant  chose  to  develop  also  the  second  factor,  I  found 
better  not  to  do  so,  partly  because  the  calculation  of  it  is  very  easy,  and  also  on 
account  of  the  great  extent  it  would  have  been  necessary  to  give  to  this  table,  in 
order  to  avoid  troublesome  interpolations. 

In  the  calculation  of  hf.  (  6~6  ),  Mr.  Oltmanns  used  the  constant  coefficient  of  the 
absolute  expansion  of  the  mercurial  column ;  I  took  that  of  the  relative  expansion 
of  the  mercury  and  of  the  brass  scale.  It  is  obvious,  therefore,  that  if  the  scale 
of  the  barometer  employed  was  of  wood,  glass,  iron,  or  of  another  substance,  it 
would  be  necessaiy  to  make  use  of  as  many  different  coefficients,  and  the  Table  II. 
could  not  be  used.  Moreover,  Oltmanns  combined  the  last  two  factors  of  the  gen- 
eral formula  in  one  single  table  with  double  entry.  This  table  I  have  calculated, 
extending  it  sufficiently  to  avoid  a  double  interpolation  ;  but  as  it  seemed  to  me 
much  too  extensive,  I  substituted  for  it  Tables  III.  and  IV.,  which  are  more  condensed, 
without  rendering  any  troublesome  interpolation  necessary. 

I  carried  the  calculation  of  these  tables  beyond  the  limits  at  which  Oltmanns  chose 
to  stop,  in  order  that  they  may  answer  for  the  most  extreme  cases. 

At  the  head  of  each  table  will  be  found  the  factor  of  which  it  is  the  development ; 
this  makes  any  other  explanation  superfluous. 

All  these  tables  give,  at  sight,  the  numbers  wanted ;  only  when  veiy  great  pre- 
cision is  desired,  a  slight  interpolation,  at  sight,  and  very  easy  to  apply,  may  be  re- 
quired. My  principal  object  was  to  relieve  the  computer  of  the  troublesome  and 
annoying  labor  of  interpolations. 

I  added  to  these  four  tables  the  small  Table  V.,  taken  from  the  Annuaire  du 
Bureau  des  Longitudes  of  Paris.  It  will  be  seldom  used. 

When  calculating  differences  of  level,  in  the  same  order,  with  the  tables,  and  by 
the  complete  formula  of  Laplace,  the  results  thus  obtained  never  differ  by  more  than 
one  decimetre  in  the  most  extreme  cases.  The  following  example  will  illustrate  this 
statement.  I  take  the  observation  made  in  a  balloon,  by  Gay-Lussac,  at  Paris,  as 
an  extreme  case,  which  is  very  well  adapted  to  manifest  the  errors  of  the  tables, 
if  there  were  any,  by  comparing  the  results  obtained  by  means  of  them  with  those  of 
the  direct  calculation  according  to  the  complete  formula  of  Laplace,  from  which 
they  are  derived. 

D  12 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 


Example  of  Calculation  ly  the  complete  Formula  of  Laplace  and  ~by  the  Tables 

Height  of  the  Balloon  of  Gay-Lussac. 
The  observation  gave  :  — 


mm. 

Balloon  h'  =  328.80 
Paris      h  =  765.68 


T'  =  —    9.5 
T  =  +  30.8 


t>  =  —    9.5 
t  =  +  30.8 


T  —  T'  =  +  40.3     (t  +  t')  =  +  21.3  et  2  (t  +  t')  =  42°.6 
With  these  data  the  formula  of  Laplace  gives  the  following  calculation  :  — 
Log.  h'.  =  328.80  ==  2.5169318 

Log.  (T  —  T')  =  -f-  40.3  =  1.6053050 

Log.  dilat.  coefficient  =  0.0001614  =  6.2079035 

Milli. 

Corr.  a  =  +        2.14  log.  =  0.3301403 
h'  =        328.80 

H  =         330.94  log.          =  2.5197480 
log.  h  =  765.68  =  2.8840473 


(Log.  h  —  Log.  H)  =  Difference  of  Log. 

Log.  of  (Log.  h  —  log.  H)  — 
Log.  general  coefficient  =  18336  = 


=  0.3642993 


9.5614583 
4.2633046 


Log.  (  (4)  18336  )  =  (A  +  a)  =  3.8247629 

Corresponding  number  =  6679.79  =  (A  -f-  a) 
Log.  cos.  2  L  =  97°  40'     =  —  9.1251872 

Log.  constant  =  0.0028371  =  +  7.4528746 

Log.  (A  +  a)  =  6679.79.    =  +  3.8247629 


Log.  (  (0.0028371.  Cos.  2  L)  X  (A  +  a)  )  =  —  0.4028247 


Milli. 


Corresponding  number  =  —  2.53 
6679.79 


Corr.  temp,  air  =  v  = 

(A  +  a  +  ft  +  v)  = 

Constant  =.  -f- 


6677.26 
284.45 

6961.71 
15926 


22887.71 

Comp1.  log.  a  =          6366200 
(A  +  o  +  0  +  v)  =       6961.71 


=  + 


25.03 


=6986.74 
Altitude  barom.  Paris    =      48.70 


Metres. 

=  (6.677  X  42.6) 


Log.  .  .  .  =  4.3596022 
Log.  .  .  .  =  3.1961197 
Log.  .  .  .  =  3.8427153 

Log.  =  +  1.3984372 


D 


Altitude  of  balloon       =  7035.44  by  the  formula  of  Laplace. 

13 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

Now  let  us  calculate  by  the  tables,  placing  side  by  side  the  corresponding  results 
given  by  the  formula  of  Laplace. 


Millim.  o 

Balloon  h'  =  328.80  T'  =  —    9.5 

Paris      h  =  765.68  T  =  +  30.8 

(h'  =  328.80: 
WltM  h  =765.68 


_     .        ( 
L  glV6S  \ 


f  =  _-    9.5 
t  =  -f  30.8 

Metres. 

1478.4       By  the  formula  of 
8209.8      Laplace  we  found  : 


A  =  6731.4 
with  (T'  —  T)  =  —  40°.3,  Table  II.  gives  a  =  —52.0 

(A  +  a)  =  6679.4 
with  L  =  48°  50',  Table  III.  gives  a  =  —   '    2.3 


with  2  (t  +  t')  direct  calculation  gives  v     =+    284.5 

(A  +  a  +  /3 
with  6960,  Table  IV.  gives  ft 


Metres. 

6679.79 
—      2.53 


j8)  =  6677.1 

6677.26 

=  +  284.5 

+  284.45 

v)  =  6961.6 

6961.71 

=  +   25.1 

-f-  25.03 

d)  =  6986.7 

6986.74 

=  +   48.7 

+  48.70 

=  7035.4 

7035.44 

Altitude  of  barometer  at  Paris 
Therefore  altitude  of  balloon 

Two  results  which  are  sensibly  identical.  This  ought  not  to  astonish  us  ;  the  tables 
being  the  exact  development  of  the  formula,  they  ought  to  give  the  same  results, 
provided  in  both  cases  nothing  has  been  neglected,  and  the  four  factors  have  been 
calculated  in  the  same  relative  order. 

DELCROS. 


Disposition  and  Use  of  the  Tables. 

The  disposition  of  the  tables  is  the  following  :  — 

In  Table  L,  the  first  column  on  the  left  contains  the  height  of  the  barometer  in 
millimetres,  corrected  for  the  error  of  the  instrument. 

The  second  column  headed  N  (number),  gives  in  metres  the  first  two  figures  of 
the  number  corresponding  to  each  height  of  the  barometer  in  the  first  column  ;  the 
third  column,  headed  0.0,  gives  the  remaining  figures  for  the  full  number  of  milli- 
metres ;  the  following  columns  give  the  remaining  figures  for  the  same  number 
millimetres  and  each  decimal  fraction  of  a  millimetre  which  may  follow  it. 
value  of  the  hundredths  is  to  be  found  in  the  last  column. 

Example:  —  Height  of  Barometer  =  761.00. 

We  look  out  in  the  first  column  for  the  number  761,  and  we  find  on  the  same  lii 
in  the  second  column,  81  ;  in  the  third  column,  headed  0.0,  or  full  number,  61, 
The  corresponding  number  is  thus  8161.1  metres. 

D  14 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

Height  of  barometer  =  761.35. 

The  second  column  gives  81 ;  the  column  headed  0.3  gives,  on  the  same  line,  64.2. 
The  corresponding  number  is  then  8164.2.  Adding  the  value  of  five  hundredths  of 
millim.,  being  Ora*.5,  as  indicated  in  the  last  column,  we  have  8164.7  metres,  cor- 
responding to  761.35  millim. 

The  other  four  tables  need  no  further  explanation. 

To  calculate,  by  means  of  the  tables,  a  difference  of  level  from  two  barometrical 
observations,  proceed  in  the  following  manner  :  — 

1.  Take  the  height  of  .the  barometer  at  the  lower  station,  or  A,  and  seek  in 
Table  I.  the  number  corresponding  to  this  height.     Seek  likewise  the  number  cor- 
responding to  the  height  of  the  barometer  at  the  upper  station.     Subtract  the  second 
from  the  first.    The  remainder  is  the  approximate  difference  of  level  between  the  two 
stations.     Then  apply  the  following  corrections. 

2.  Correction  to  be  applied  for  the  temperature  of  the  barometers. 

If  T'  be  the  temperature  of  the  attached  thermometer  at  the  upper  station,  and  T 
that  of  the  attached  thermometer  at  the  lower  station,  take  the  difference,  or  T7  —  T, 
and  seek  in  Table  II.  the  number  corresponding  to  this  difference. 

When  T'  is  smaller^than  T,  that  is,  when  the  temperature  of  the  attached  ther- 
mometer of  the  upper  station  is  lower  than  that  of  the  lower  station,  the  correction 
is  to  be  subtracted  from  the  approximate  height ;  when  T'  is  greater  than  T,  it  is  to 
be  added. 

3.  Correction  for  the  temperature  of  the  air. 

The  first  correction  having  been  applied,  multiply  the  number  obtained,  or  N,  by 
the  double  sum  of  the  temperatures  of  the  air  at  both  stations,  and  divide  the  prod- 
uct by  1000  ;  the  number  thus  found,  or  the  quantity  expressed  by  j^.  2  (t  -|-  t') 
is  the  correction  in  metres  which  is  to  be  added  to  the  preceding  number  N. 

4.  Tables  III.  and  IV.   give  two  corrections  ;   the   first   due  to  the  decrease  of 
gravitation  in  latitude,  which  is  to  be  added  when  the  mean  latitude  of  the  places 
of  observation  is  between  the  45th  parallel  and  the  equator  ;  and  to  be  subtracted 
when  it  is  between  the  same  parallel  and  the  poles,  as  indicated  at  the  head  of  the 
columns.     The  second  correction,  due  to  the  decrease  of  gravitation  on  the  vertical 
line,  is  always  additive. 

5.  Table  V.  gives  another  small  correction  to  be  added  in  the  case  of  the  lower 
station  being  very  elevated  above  the  level  of  the  ocean. 


EXAMPLES  OF  CALCULATION. 
Measurement  of  the  Height  of  Guanaxuato.     By  M.  de  Humboldt. 

mm.    •  5 

Barometer  at  the  upper  station,  h'  =  600.95     T'  =  21.3     t'  =  21.3 

Barometer  at  the  level  of  the  sea,  h  =  763.15     T  =  25.3     t  =  25.3 

D  15 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 


(  h  =  8183. 
Table  I.  gives  the  corresponding  numbers,  \  ,  7 fioen 


Difference,  1902.7 

Table  II.  gives  for  T'  —  T,  5.2 

Difference,  1897.5  =  N 

^  2  (*  +  *')  -  1.897  X  93.2,  ;               +  176.8 

Sum,  2074.3 

Table  III.  gives  for  mean  latitude  of  21°,  +       4.3 
Table  IV.  gives  for  decrease  of  gravitation  in  the  vertical  line,       -|-       6.0 

Hence  altitude  of  Guanaxuato  above  the  ocean,  2084.6 


Measurement  of  the  height  of  Mont  Blanc,  August  29,  1844.     By  MM.  Bravais 

and  Martins. 

mm.  o  o 

Barometer  at  one  metre  below  the  summit,  h'  =  424.05  T'  =  —   4.2  t1  =  —   7.6 
Barometer  of  the  Observatory  of  Geneva,  h  =  729.65  T  =       18.6  t  =       19.3 

f  h  =  7826.0 
Table  I.  gives  for  numbers  corresponding  to  <       __      . 


Difference,  4321.6 

Table  II.  gives  for  T7  —  T,  —    29.3 

Difference,  4292.3  =  N 

igg.  2  (t  +  t')  =  4292  X  23.4  =  +  100.4 

Sum,  4392.7 

Table  III.  gives  for  the  mean  latitude  of  46°,  0.4 

Difference,  4392.3 

Table  IV.  for  decrease  of  gravitation  in  the  vertical  line  +     l3-^ 

Table  V.  for  the  elevation  of  the  lower  station,  -f-      0.5 

Sum,  4406.5 

Elevation  of  the  lower  barometer  above  the  ocean,  407.0 

Hence  elevation  of  upper  barometer  above  the  ocean,  4813.5 

Finally,  height  of  the  summit  of  Mont  Blanc  above  the  ocean,  4814.5 

D  16 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  DELCROS. 


TABLE  I.  —  Giving  A  ==  18336  X  log.  H  or  h....,  argument  H  or  h  in  Millimetres. 


Barom- 

Parts 

eter 

N. 

0.0 

O.I 

0.2 

0.3 

O.4 

0.5 

0.6 

0.7 

O.8 

0.9 

for  each 
0.01mm. 

Milli. 

Metr. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metr. 

288 

4 

23.4 

26.2 

28.9 

31.7 

34.4 

37.2 

40.0 

42.7 

45.5 

48.2 

1 

0.3 

289 

4 

51.0 

53.8 

56.5 

59.3 

62.0 

64.8 

67.5 

70.3 

73.0 

75.8 

2 

0.5 

290 

4 

78.5 

81.3 

84.0 

86.7 

89.5 

92.2 

95.0 

97.7 

3 

0.8 

290 

5 

00.4 

03.2 

4 

1.1 

291 

5 

05.9 

08.7 

11.4 

14.1 

16.8 

19.6 

22.3 

25.0 

27.8 

30.5 

5 

1.4 

292 

5 

33.2 

36.0 

38.7 

41.4 

44.1 

46.8 

49.6 

52.3 

55.0 

57.7 

6 

1.6 

!    293 

5 

60.5 

63.2 

65.9 

68.6 

71.3 

74.0 

76.7 

79.5 

82.2 

84.9 

7 

1.9 

I    294 

5 

87.6 

90.3 

93.0 

95.7 

98.4 

8 

2.2 

294 

6 

01.1 

03.8 

06.5 

09.2 

11.9 

9 

2.4 

295 

6 

14.6 

17.3 

20.0 

22.7 

25.4 

28.1 

30.8 

33.5 

36.2 

38.9 

296 

6 

41.6 

44.3 

47.0 

49.6 

52.3 

55.0 

57.7 

60.4 

63.1 

65.8 

297 

6 

68.4 

71.1 

73.8 

76.5 

79.1 

81.8 

84.5 

87.2 

89.9 

92.5 

298 

6 

95.2 

97.9 

298 

7 

00.5 

03.2 

05.9 

08.6 

11.2 

13.9 

16.6 

19.2 

299 

7 

21.9 

24.5 

27.2 

29.9 

32.5 

35.2 

37.8 

40.5 

43.2 

45.8 

300 

7 

48.5 

51.1 

53.8 

56.4 

59.1 

61.7 

64.4 

67.0 

69.7 

72.3 

301 

7 

75.0 

77.6 

80.3 

82.9 

85.5 

88.2 

90.8 

93.5 

96.1 

98.7 

302 

8 

01.4 

04.0 

06.6 

09.3 

11.9 

14.5 

17.2 

19.8 

22.4 

25.1 

303 

8 

27.7 

30.3 

33.0 

35.6 

38.2 

40.8 

43.5 

46.1 

48.6 

51.3 

304 

8 

54.0 

56.6 

59.2 

61.8 

64.4 

67.0 

69.6 

72.3 

74.9 

77.5 

305 

8 

80.1 

82.7 

85.3 

87.9 

90.5 

93.1 

95.7 

98.3 

305 

9 

01.0 

03.6 

306 

9 

06.2 

08.8 

11.4 

14.0 

16.6 

19.2 

21.8 

24.4 

27.0 

29.6 

1 

0.3 

307 

9 

32.1 

34.7 

37.3 

39.9 

42.5 

45.1 

47.7 

50.3 

52.9 

55.5 

2 

0.5 

308 

9 

58.0 

60.6 

63.2 

65.8 

68.4 

70.9 

73.5 

76.1 

78.7 

81.3 

3 

0.8 

!   309 

9 

83.9 

86.4 

89.0 

91.6 

94.1 

96.7 

99.3 

4 

1.0 

309 

10 

01.9 

04.4 

07.0 

5 

1.3 

310 

10 

09.6 

12.1 

14.7 

17.3 

19.8 

22.4 

25.0 

27.5 

30.1 

32.7 

6 

1.5 

311 

10 

35.2 

37.8 

40-3 

42.9 

45.5 

48.0 

50.6 

53.1 

55.7 

58.2 

7 

1.8 

312 

10 

60.8 

63.3 

65.9 

68.4 

71.0 

73.5 

76.1 

78.6 

81.2 

83.7 

8 

2.1 

i   313 

10 

86.3 

88.8 

91.4 

93.9 

96.4 

99.0 

9 

2.3 

313 

11 

01.5 

04.1 

06.6 

09.1 

314 

11 

11.7 

14.2 

16.7 

19.3 

21.8 

24.3 

26.9 

29.4 

31.9 

34.5 

315 

11 

37.0 

39.5 

42.0 

44.6 

47.1 

49.6 

52.1 

54.7 

57.2 

59.7 

316 

11 

62.2 

64.8 

67.3 

69.8 

72.3 

74.8 

77.3 

79.9 

82.4 

84.9 

1   317 

11 

87.4 

89.9 

92.4 

94.9 

97.4 

99.9 

317 

12 

02.4 

05.0 

07.5 

10.0 

1   318 

12 

12.5 

15.0 

17.5 

20.0 

22.5 

25.0 

27.5 

30.0 

32.5 

35.0 

319 

12 

37.5 

40.0 

42.5 

45.0 

47.5 

50.0 

52.4 

54.9 

57.4 

59.9 

320 

12 

62.4 

64.9 

67.4 

69.9 

72.3 

74.8 

77.3 

79.8 

82.3 

84.8 

j   321 

12 

87.2 

89.7 

92.2 

94.7 

92.1 

99.6 

321 

13 

02.1 

04.6 

07.1 

09.5 

322 

13 

12.0 

14.5 

17.0 

19.4 

21.9 

24.4 

26.8 

29.3 

31.8 

34.2 

323 

13 

36.7 

39.2 

41.6 

44.1 

46.6 

49.0 

51.5 

53.9 

56.4 

58.9 

324 

13 

61.3 

63.8 

66.2 

68.7 

71.1 

73.6 

76.1 

78.5 

81.0 

83.4 

325 

13 

85.9 

88.3 

90.8 

93.2 

95.7 

98.1 

325 

14 

00.5 

03.0 

05.4 

07.9 

Barom- 
eter 

N. 

o.o 

0.1 

0.2 

0.3 

0.4 

O.5 

O.6 

0.7 

0.8 

0.9 

Parts 
or  each 

tforh. 

0.01mm. 

D 


17 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  DELCROS. 


326  to  364mm. 


Barom- 

Parts 

eter 
florh. 

N. 

o.o 

0.1 

0.2 

O.3 

O.4 

O.5 

O.6 

O.7 

O.8 

O.9 

for  each 
0.01mm. 

Milli. 

Metr. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metr. 

326 

14 

10.3 

12.8 

15.2 

17.6 

20.1 

22.5 

25.0 

27.4 

29.8 

32.3 

1 

0.2 

327 

14 

34.7 

37.2 

39.6 

42.0 

44.5 

46.9 

49.3 

51.7 

54.2 

56.6 

2 

0.5 

328 

14 

59.0 

61.5 

63.9 

66.3 

68.7 

71.2 

73.6 

76.0 

78.4 

80.9 

8 

0.7 

329 

14 

83.3 

85.7 

88.1 

90.5 

92.9 

95.4 

97.8 

4 

1.0 

329 

15 

00.2 

02.6 

05.0 

5 

1.2 

330 

15 

07.4 

09.9 

12.3 

14.7 

17.1 

19.5 

21.9 

24.3 

26.7 

29.1 

6 

1.5 

331 

15 

31.5 

33.9 

36.3 

38.7 

41.2 

43.6 

46.0 

48.4 

50.8 

53.2 

7 

1.7 

332 

15 

55.6 

58.0 

60.4 

62.8 

65.1 

67.5 

69.9 

72.3 

74.7 

77.1 

8 

2.0 

333 

15 

79.5 

81.9 

84.3 

86.7 

89.1 

91.4 

93.8 

96.2 

98.6 

9 

2.2 

333 

16 

01.0 

334 

16 

03.4 

05.8 

08.1- 

10.5 

12.9 

15.3 

17.7 

20.0 

22.4 

24.8 

335 

16 

27.2 

29.6 

31.9 

34.3 

36.7 

39.1 

41.4 

43.8 

46.2 

48.8 

336 

16 

50.9 

53.3 

55.7 

58.0 

60.4 

62:8 

65.1 

67.5 

69.9 

72.2 

1 

0.2 

337 

16 

74.6 

77.0 

79.3 

81.7 

84.0 

86.4 

88.8 

91.1 

93.5 

95.8 

2 

0.4 

338 

16 

98.2 

S 

0.7 

338 

17 

00.5 

02.9 

05.2 

07.6 

10.0 

12.3 

14.7 

17.0 

19.4 

4 

.0 

339 

17 

21.7 

24.1 

26.4 

28.8 

31.1 

33.4 

35.8 

38.1 

40.5 

42.8 

5 

.2 

340 

17 

45.2 

47.5 

49.8 

52.2 

54.5 

56.9 

59.2 

61.5 

63.9 

66.2 

6 

.8 

341 

17 

68.6 

70.9 

73.2 

75.6 

77.9 

80.2 

82.6 

84.9 

87.2 

89.5 

7 

.7 

342 

17 

91.9 

94.2 

96.5 

98.9 

8 

.9 

342 

18 

01.2 

03.5 

05.8 

08.2 

10.5 

12.8 

9 

2.2 

343 

18 

15.1 

17.4 

19.8 

22.1 

24.4 

26.7 

29.0 

31.4 

33.7 

36.0 

i 

344 

18 

38.3 

40.6 

42.9 

45.2 

47.6 

49.9 

52.2 

54.5 

56.8 

59.1 

345 

18 

61.4 

63.7 

66.0 

68.3 

70.6 

73.0 

75.3 

77.6 

79.9 

82.2 

346 

18 

84.5 

86.8 

89.1 

91.4 

93.7 

96.0 

98.3 

346 

19 

00.6 

02.9 

05.2 

347 

19 

07.5 

09.6 

12.0 

14.3 

16.6 

18.9 

21.2 

23.5 

25.8 

28.1 

348 

19 

30.4 

32.7 

34.9 

37.2 

39.5 

41.8 

44.1 

46.4 

48.6 

50.9 

349 

19 

53.2 

55.5 

57.8 

60.1 

62.3 

64.6 

66.9 

69.2 

71.5 

73.7 

350 

19 

76.0 

78.3 

80.6 

82.8 

85.1 

87.4 

89.6 

91.9 

94.2 

96.5 

1 

0.2 

351 

19 

98.7 

2 

0.4 

351 

20 

01.0 

03.3 

05.5 

07.8 

10.1 

12.3 

14.6 

16.8 

19.1 

3 

0-7 

352 

20 

21.4 

23.6 

25.9 

28.2 

30.4 

32.7 

34.9 

37.2 

39.5 

41.7 

4 

0.9 

353 

20 

44.0 

46.2 

'48.5 

50.7 

53.0 

55.2 

57.5 

59.7 

62.0 

64.2 

5 

1.1 

354 

20 

66.5 

68.7 

71.0 

73.2 

75.5 

77.7 

80.0 

82.2 

84.5 

86.7 

6 

1.3 

355 

20 

89.0 

91.2 

93.4 

95.7 

97.9 

7 

1.6 

355 

21 

00.2 

02.4 

04.6 

06.9 

09.1 

8 

1.8 

356 

21 

11.4 

13.6 

15.8 

18.1 

20.3 

22.5 

24.8 

27.0 

29.2 

31.5 

9 

2.1 

357 

21 

33.7 

35.9 

38.2 

40.4 

42.6 

44.8 

47.1 

49.3 

51.5 

53.7 

358 

21 

56.0 

58.2 

60.4 

62.6 

64.9 

67.1 

69.3 

71.5 

73.7 

76.0 

359 

21 

78.2 

80.4 

82.6 

84.8 

87.0 

89.3 

91.5 

93.7 

95.9 

98.1 

360 

22 

00.3 

02.5 

04.8 

07.0 

09.2 

11.4 

13.6 

15.8 

18.0 

20.2 

361 

22 

22.4 

24.6 

26.8 

29.0 

31.2 

33.4 

35.6 

37.9 

40.1 

42.3 

362 

22 

44.5 

46.7 

48.9 

51.0 

53.2 

55.4 

57.6 

59.8 

62.0 

64.2 

363 

22 

66.4 

68.6 

70.8 

73.0 

75.2 

77.4 

79.6 

81.8 

83.9 

86.1 

364 

22 

88.3 

90.5 

92.7 

94.9 

97.1 

99.3 

364 

23 

01.4 

03.6 

05.8 

08.0 

Barom- 
eter 

N. 

O.O 

0.1 

0.2 

O.3 

O.4 

O.5 

O.6 

0.7 

O.8 

O.9 

Parts 
for  each 

//or  h. 

1  0.01  mm,  , 

D 


18 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. DELCROS. 


365  to  4O3mm . 


Barom- 
eter 
Horh. 

N. 

0.0 

O.I 

0.2 

O.3 

0.4 

0.5 

O.6 

O.7 

0.8 

0.9 

Parts 
for  each 
0.01mm. 

Milli. 

Metr. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metr. 

365 

23 

10.2 

12.4 

14.5 

16.7 

18.9 

21.1 

23.2 

25.4 

27.6 

29.8 

1 

0.2 

366 

23 

32.0 

34.1 

36.3 

.38.5 

40.7 

42.8 

45.0 

47.2 

49.3 

51.5 

2 

0.4 

367 

23 

53.7 

55.9 

58.0 

60.2 

62.4 

64.5 

66.7 

68.9 

71.0 

73.2 

3 

0.6 

368 

23 

75.4 

77.5 

79.7 

81.8 

84.0 

86.2 

88.3 

90.5 

92.6 

94.8 

4 

0.9 

369 

23 

97.0 

99.1 

5 

1.1 

369 

24 

01.3 

03.4 

05.6 

07.7 

09.9 

12.1 

14.2 

16.4 

6 

1.3 

|    370 

24 

18.5 

20.6 

22.8 

24.9 

27.1 

29.2 

31.4 

33.5 

35.7 

37.8 

7 

1.5 

371 

24 

40.0 

42.1 

44.3 

46.4 

48.6 

50.7 

52.9 

55.0 

57.2 

59.3 

8 

1.7 

372 

24 

61.5 

63.6 

65.8 

67.9 

70.1 

72.2 

74.3 

76.5 

78.6 

80.8 

9 

1.9 

373 

24 

82.9 

85.0 

87.2 

89.3 

91.4 

93.6 

95.7 

97.8 

99.9 

373 

25 

02.1 

374 

25 

04.2 

06.3 

08.4 

10.6 

12.7 

14.8 

16.9 

19.0 

21.2 

23.3 

375 

25 

25.4 

27.5 

29.6 

31.8 

33.9 

36.0 

38.1 

40.2 

42.4 

44.5 

376 

25 

46.6 

48.7 

50.8 

53.0 

55.1 

57.2 

59.3 

61.4 

63.6 

65.7 

377 

25 

67.8 

69.9 

72.0 

74.1 

76.2 

78.3 

80.5 

82.6 

84.7 

86.8 

378 

25 

88.9 

91.0 

93.1 

95.2 

97.3 

99.4 

378 

26 

01.5 

03.6 

05.7 

07.8 

379 

26 

09.9 

12.0 

14.1 

16.2 

18.3 

20.4 

22.5 

24.6 

26.7 

28.8 

380 

26 

30.9 

33.0 

35.1 

37.2 

39.3 

41.3 

43.4 

45.5 

47.6 

49.7 

381 

26 

51.8 

53.9 

56.0 

58.1 

60.2 

62.2 

64.3 

66.4 

68.5 

70.6 

382 

26 

72.7 

74.8 

76.9 

78.9 

81.0 

83.1 

85.2 

87.3 

89.3 

91.4 

383 

26 

93.5 

95.6 

97.7 

99.7 

383 

27 

01.8 

03.9 

06.0 

08.1 

10.1 

12.2 

1 

0.2 

384 

27 

14.3 

16.4 

18.4 

205 

22.6 

24.6 

26.7 

28.8 

30.9 

32.9 

2 

0.4 

385 

27 

35.0 

37.1 

39.1 

41.2 

43.2 

45.3 

47.4 

49.4 

51.5 

53.5 

3 

0.6 

386 

27 

55.6 

57.7 

59.7 

61.8 

63.8 

65.9 

68.0 

70.0 

72.1 

74.1 

4 

0.9 

387 

27 

76.2 

78.3 

80.3 

82.4 

84.4 

86.5 

88.6 

90.6 

92.7 

94.7 

5 

1.1 

388 

27 

96.8 

98.8 

6 

1.3 

388 

28 

00.9 

02.9 

05.0 

07.0 

09.1 

11.1 

13.2 

15.2 

7 

1.5 

389 

28 

17.3 

19.3 

21.4 

23.4 

25.5 

27.5 

29.6 

31.6 

33.7 

35.7 

8 

1.7 

390 

28 

37.8 

39.8 

41.9 

43.9 

46.0 

48.0 

50.0 

52.1 

54.1 

56.2 

9 

1.9 

391 

28 

58.2 

60.2 

62.3 

64.3 

66.3 

68.3 

70.4 

72.4 

74.4 

76.5 

392 

28 

78.5 

80.5 

82.6 

84.6 

86.6 

88.6 

90.7 

92.7 

94.7 

96.8 

393 

28 

98.8 

393 

29 

00.8 

02.8 

04.9 

06.9 

08.9 

10.9 

12.9 

15.0 

17.0 

394 

29 

19.0 

21.0 

23.0 

25.1 

27.1 

29.1 

31.1 

33.1 

35.2 

37.2 

395 

29 

39.2 

41.2 

43.2 

45.2 

47.2 

49.2 

51.3 

53.3 

55.3 

57.3 

I 

396 

29 

59.3 

61.3 

63.3 

65.3 

67.3 

69.3 

71.4 

73.4 

75.4 

77.4 

397 

29 

79.4 

81.4 

83.4 

85.4' 

87.4 

89.4 

91.5 

93.5 

95.5 

97.5 

398 

29 

99.5 

398 

30 

01.5 

03.5 

05.5 

07.5 

09.5 

11.5 

13.5 

15.5 

17.5 

399 

30 

19.5 

21.5 

23.5 

25.5 

27.5 

29.4 

31.4 

33.4 

35.4 

37.4 

400 

30 

39.4 

41.4 

43.4 

45.4 

47.4 

49.4 

51.3 

53.3 

55.3 

57.3 

401 

30 

59.3 

61.3 

63.3 

65.2 

67.2 

69.2 

71.2 

73.2 

75.1 

77.1 

402 

30 

79.1 

81.1 

83.1 

85.0 

87.0 

89.0 

91.0 

93.0 

94.9 

96.9 

403 

30 

98.9 

Barom- 
eter 
H  or  h. 

N. 

o.o 

O.I 

0.2 

0.3 

O.4 

O.5 

0.6 

0.7 

0.8 

0.9 

Parts 
or  each 
0.01mm. 

D 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  DELCROS. 


4O3  to  442mm-. 


Barom- 
eler 
Horh. 

N. 

o.o 

O.I 

0.2 

0.3 

0.4 

0.5 

0.6 

0.7 

0.8 

O.9 

Parts 
for  each 
0.01  mm. 

Milli. 

Metr. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metr. 

403 

31 

00.9 

02.8 

04.8 

06.8 

08.7 

10.7 

12.7 

14.7 

16.6 

1 

0.2 

404 

31 

18.6 

20.6 

22.5 

24.5 

26.5 

28.4 

30.4 

32.4 

34.4 

36.3 

2 

0.4 

405 

31 

38.3 

40.3 

42.2 

44.2 

46.1 

48.1 

50.1 

52.0 

54.0 

55.9 

3 

0.6 

406 

31 

57.9 

59.9 

61.8 

63.8 

65.7 

67.7 

69.7 

71.6 

73.6 

75.5 

4 

0.8 

407 

31 

77.5 

79.5 

81.4 

83.4 

85.3 

87.3 

89.3 

91.2 

93.2 

95.1 

5 

.0 

408 

31 

97.1 

99.0 

6 

.2 

408 

32 

01.0 

02.9 

04.9 

06.8 

08.8 

10.7 

12.7 

14.6 

7 

.4 

409 

32 

16.6 

18.5 

20.5 

22.4 

24.4 

26.3 

28.2 

30.2 

32.1 

34.1 

8 

.6 

410 

32 

36.0 

37.9 

39.9 

41.8 

43.8 

45.7 

47.6 

49.6 

51.5 

53.5 

<) 

1.8 

411 

32 

55.4 

57.3 

59.3 

61.2 

63.2 

65.1 

67.0 

69.0 

70.9 

72.9 

412 

32 

74.8 

76.7 

78.7 

80.6 

82.5 

84.4 

86.4 

88.3 

90.2 

92.2 

413 

32 

94.1 

96.0 

97.9 

99.9 

413 

33 

01.8 

03.7 

05.6 

07.5 

09.5 

11.4 

414 

33 

13.3 

15.2 

17.1 

19.1 

21.0 

22.9 

24.8 

26.7 

28.7 

30.6 

415 

33 

32.5 

34.4 

36.3 

38.3 

40.2 

42.1 

44.0 

45.9 

47.9 

49.8 

416 

33 

51.7 

53.6 

55.5 

57.4 

59.3 

61.2 

63.2 

65.1 

67.0 

68.9 

417 

33 

70.8 

72.7 

74.6 

76.5 

78.4 

80.3 

82.3 

84.2 

86.1 

88.0 

418 

33 

89.9 

91.8 

93.7 

95.6 

97.5 

99.4 

418 

34 

01.3 

03.2 

05.1 

07.0 

419 

34 

08.9 

10.8 

12.7 

14.6 

16.5 

18.4 

20.3 

22.2 

24.1 

26.0 

420 

34 

27.9 

29.8 

31.7 

33.6 

35.5 

37.3 

39.2 

41.1 

43.0 

44.9 

421 

34 

46.8 

48.7 

50.6 

52.5 

54.4 

56.2 

58.1 

60.0 

61.9 

63.8 

422 

34 

65.7 

67.6 

69.5 

71.4 

73.3 

75.1 

77.0 

78.9 

80.8 

82.7 

1 

0.2 

423 

34 

84.6 

86.5 

88.4 

90.2 

92.1 

94.0 

95.9 

97.8 

99.6 

2 

0.4 

423 

35 

01.5 

3 

0.6 

424 

35 

03.4 

05.3 

07.2 

09.0 

10.9 

12.8 

14.7 

16.6 

18.4 

20.3 

4 

0.8 

5 

.0 

425 

35 

22.2 

24.1 

25.9 

27.8 

29.6 

31.5 

33.4 

35.2 

37.1 

38.9 

6 

.2 

426 

35 

40.8 

42.7 

44.5 

46.4 

48.3 

50.1 

52.0 

53.9 

55.8 

57.6 

7 

.4 

427 

35 

59.5 

61.4 

63.2 

65.1 

67.0 

68.8 

70.7 

72.6 

74.5 

76.3 

8 

.6 

428 

35 

78.2 

80.1 

81.9 

83.8 

85.6 

87.5 

89.4 

91.2 

93.1 

94.9 

9 

.8 

429 

35 

96.8 

98.6 

429 

36 

00.5 

02.3 

04.2 

06.0 

07.9 

09.7 

11.6 

13.4 

430 

36 

15.3 

17.1 

19.0 

20.8 

22.7 

24.6 

26.4 

28.2 

80.1 

31.9 

431 

36 

33.8 

35.6 

37.5 

39.3 

41.2 

43.0 

44.8 

46.7 

48.5 

50.4 

432 

36 

52.2 

54.0 

55.9 

57.7 

59.6 

61.4 

63.2 

65.1 

66.9 

68.8 

433 

36 

70.6 

72.4 

74.3 

76.1 

78.0 

79.8 

81.6 

83.5 

85.3 

87.2 

434 

36 

89.0 

90.8 

92.7 

94.5 

96.3 

98.1 

434 

37 

00.0 

01.8 

03.6 

05.5 

435 

37 

07.3 

09.1 

11.0 

12.8 

14.6 

16.4 

18.3 

20.1 

21.9 

23.8 

436 

37 

25.6 

27.4 

29.2 

31.1 

32.9 

34.7 

36.5 

38.3 

40.2 

42.0 

437 

37 

43.8 

45.6 

47.5 

49.3 

51.1 

52.9 

54.8 

56.6 

58.4 

60.3 

438 

37 

62.1 

63.9 

65.7 

67.6 

69.4 

71.2 

73.0 

74.8 

76.7 

78.5 

439 

37 

80.3 

82.1 

83.9 

85.7 

87.5 

89.3 

91.2 

93.0 

94.8 

96.6 

440 

37 

98.4 

440 

38 

00.2 

02.0 

03.8 

05.6 

07.5 

09.3 

11.1 

12.9 

14.7 

441 

38 

16.5 

18.3 

20.1 

21.9 

23.7 

25.5 

27.3 

29.1 

30.9 

32.7 

442 

38 

34.5 

36.3 

38.1 

39.9 

41.7 

43.5 

45.3 

47.1 

48.9 

50.7 

Barom- 
eter 
Horh. 

N. 

O.O 

0.1 

0.2 

O.3 

0.4 

O.5 

O.6 

0.7 

0.8 

0.9 

Parts 
for  each 
001mm. 

D 


20 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  DELCROS. 


443  to  482ram-. 


Barom- 
eter 
Horh. 

N. 

Tenth  of  Millimetre. 

Parts 
for  each 
0.01mm. 

o.o 

O.I 

O.2 

O.3 

0.4 

O.5 

O.6 

O.7 

0.8 

O.9 

Milli. 

Metr. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metr. 

443 

38 

52.5 

54.3 

56.1 

57.9 

59.7 

61.4 

63.2 

65.0 

66.8 

68.6 

444 

38 

70.4 

72.2 

74.0 

75.8 

77.6 

79.3 

81.1 

82.9 

84.7 

86.5 

445 

38 

88.3 

90.1 

91.9 

93.7 

95.5 

97.2 

99.0 

445 

39 

00.8 

02.6 

04.4 

446 

39 

06.2 

08.0 

09.8 

11.5 

13.3 

15.1 

16.9 

18.7 

20.4 

22.2 

447 

39 

24.0 

25.8 

27.6 

29.3 

31.1 

32.9 

34.7 

36.5 

38.2 

40.0 

• 

448 

39 

41.8 

43.6 

45.4 

47.1 

48.9 

50.7 

52.5 

54.3 

56.0 

57.8 

449 

39 

59.6 

61.4 

63.1 

64.9 

66.7 

68.4 

70.2 

72.0 

73.8 

75.5 

450 

39 

77.3 

79.1 

80.8 

82.6 

84.3 

86.1 

87.9 

89.6 

91.4 

93.1 

451 

39 

94.9 

96.7 

98.4 

451 

40 

00.2 

02.0 

03.7 

05.5 

07.3 

09.1 

10.8 

452 

40 

12.6 

14.4 

16.1 

17.9 

19.6 

21.4 

23.2 

24.9 

26.7 

28.4 

453 

40 

30.2 

32.0 

33.7 

35.5 

37.2 

39.0 

40.8 

42.5 

44.3 

46.0 

454 

40 

47.8 

49.5 

51.3 

53.0 

54.8 

56.5 

58.3 

60.0 

61.8 

63.5 

455 

40 

65.3 

67.0 

68.8 

70.5 

72.3 

74.0 

75.8 

77.5 

79.3 

81.0 

1   0.2 

456 

40 

82.8 

84.5 

86.3 

88.0 

89.8 

91.5 

93.2 

95.0 

96.7 

98.5 

2   0.3 

457 

41 

00.2 

01.9 

03.7 

05.4 

07.2 

08.9 

10.6 

12.4 

14.1 

15.9 

3   0.5 

458 

41 

17.6 

19.3 

21.1 

22.8 

24.6 

26.3 

28.0 

29.8 

31.5 

33.3 

4   0.7 

459 

41 

35.0 

S6.7 

38.5 

40.2 

41.9 

43.6 

45.4 

47.1 

48.8 

50.6 

5   0.9 

460 

41 

52.3 

54.0 

55.8 

57.5 

59.2 

60.9 

62.7 

64.4 

66.1 

67.9 

6    1.0 

461 

41 

69.6 

71.3 

73.1 

74.8 

76.5 

78.2 

80.0 

81.7 

83.4 

85.2 

7    1.2 

462 

41 

86.9 

88.6 

90.3 

92.1 

93.8 

95.5 

97.2 

98.9 

8    1.4 

462 

42 

00.7 

02.3 

9   1.6 

463 

42 

04.1 

05.8 

07.5 

09.3 

11.0 

12.7 

14.4 

16.1 

17.9 

19.6 

464 

42 

21.3 

23.0 

24.7 

26.4 

28.1 

29.8 

31.6 

33.3 

35.0 

36.7 

465 

42 

38.4 

40.1 

41.8 

43.5 

45.2 

46.9 

48.7 

50.4 

52.1 

53.8 

466 

42 

55.5 

57.2 

58.9 

60.6 

62.3 

64.0 

65.8 

67.5 

69.2 

70.9 

467 

42 

72.6 

74.3 

76.0 

77.7 

79.4 

81.1 

82.8 

84.5 

86.2 

87.9 

468 

42 

89.6 

91.3 

93.0 

94.7 

96.4 

98.1 

99.8 

468 

43 

01.5 

03.2 

04.9 

469 

43 

06.6 

08.3 

10.0 

11.7 

13.4 

15.1 

16.8 

18.5 

20.2 

21.9 

470 

43 

23.6 

25.3 

27.0 

28.7 

30.4 

32.0 

33.7 

35.4 

37.1 

38.8 

471 

43 

40.5 

42.2 

43.9 

45.6 

47.3 

48.9 

50.6 

52.3 

54.0 

55.7 

472 

43 

57.4 

59.1 

60.8 

62.5 

64.2 

65.8 

67.5 

69.2 

70.9 

72.6 

473 

43 

74.3 

76.0 

77.7 

79.3 

81.0 

82.7 

84.4 

86.1 

87.7 

89.4 

474 

43 

91.1 

92.8 

94.5 

96.1 

97.8 

99.5 

474 

44 

01.2 

02.9 

04.5 

06.2 

475 

;    476 

44 
44 

07.9 
24.6 

09.6 
26.3 

11.2 
27.9 

12.9 

29.6 

14.6 
31.3 

16.2 
33.9 

17.9 
35.6 

19.6 
37.3 

21.3 
39.0 

22.9 
40.6 

I 

477 

44 

41.3 

43.0 

44.6 

46.3 

48.0 

49.6 

51.3 

53.0 

54.7 

56.3 

478 

44 

58.0 

59.7 

61.3 

63.0 

64.7 

66.3 

68.0 

69.7 

71.4 

73.0 

j; 

479 

44 

74.7 

76.4 

78.0 

79.7 

81.3 

83.0 

84.7 

86.3 

88.0 

89.6 

480 

44 

91.3 

93.0 

94.6 

96.3 

97.9 

99.6 

480 

45 

01.3 

02.9 

04.6 

06.2 

481 

45 

07.9 

09.5 

11.2 

12.8 

14.5 

16.1 

17.7 

19.4 

21.0 

22.7 

482 

45 

24.3 

25.9 

27.6 

29.2 

30.9 

32.5 

34.2 

35.8 

37.5 

39.1 

Barom- 
eter 
Horh. 

N. 

0.0 

0.1 

0.2 

O.3 

0.4 

O.5 

O.6 

0.7 

0.8 

0.9 

Parts 
for  each 
0.01mm. 

D 


21 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  DELCROS. 


483  to  524mra\ 


Barom- 
eter 
Horh. 

Mi  Hi. 
483 

N. 

o.o 

O.I 

0.2 

0.3 

O.4 

O.5 

O.6 

O.7 

O.8 

0.9 

Parts 
for  each 
0.01mm. 

Metr. 
45 

Metres. 
40.8 

Metres. 
42.4 

Metres. 
44.1 

Metres. 
45.7 

Metres 
47.4 

Metres. 
49.0 

Metres. 
50.7 

Metres. 
52.3 

Metres. 
54.0 

Metres. 
55.6 

Metr. 
1    0.2 

484 

45 

57.3 

58.9 

60.6 

62.2 

63.9 

655 

67.1 

68.8 

70.4 

72.1 

2   0.3 

485 

45 

73.7 

75.3 

77.0 

78.6 

80.3 

81.9 

83.6 

85.2 

86.9 

88.5 

3   0.5 

486 

45 

90.2 

91.8 

93.5 

95.1 

96.8 

98.4 

4   0.6 

486 

46 

00.0 

01.7 

03.3 

05.0 

5   0.8 

487 

46 

06.6 

08.2 

09.9 

11.5 

13.1 

14.7 

16.4 

18.0 

19.6 

21.3 

6    1.0 

488 

46 

22.9 

24.5 

26.2 

27.8 

29.4 

31.0 

32.7 

34.3 

35.9 

37.6 

7   1.1 

489 

46 

39.2 

40.8 

42.4 

44.1 

45.7 

47.3 

48.9 

50.5 

52.2 

53.8 

8    1.3 

490 

46 

55.4 

57.0 

58.6 

60.3 

61.9 

63.5 

65.1 

66.7 

68.4 

70.0 

9    1.4 

491 

46 

71.6 

73.2 

74.9 

76.5 

78.1 

79.7 

81.4 

83.0 

84.6 

86.3 

492 

46 

87.9 

89.5 

91.1 

92.8 

94.4 

'96.0 

97.6 

99.2 

492 

47 

00.9 

02.5 

493 

47 

04.1 

05.7 

07.3 

08.9 

10.5 

12.1 

13.8 

15.4 

17.0 

18.6 

494 

47 

20.2 

21.8 

23.4 

25.0 

26.6 

28.2 

29.9 

31.5 

33.1 

34.7 

495 

47 

36.3 

37.9 

39.5 

41.1 

42.7 

44.3 

45.9 

47.5 

49.1 

50.7 

496 

47 

52.3 

53.9 

55.5 

57.1 

58.7 

60.3 

61.9 

63.5 

65.1 

66.7 

497 

47 

68.3 

69.9 

71.5 

73.1 

74.7 

76.3 

78.0 

79.6 

81.2 

82.8 

498 

47 

84.4 

86.0 

87.6 

89.2 

90.8 

92.4 

94.0 

95.6 

97.2 

98.8 

499 

48 

00.4 

02.0 

03.6 

05.2 

06.8 

08.3 

09.9 

11.5 

13.1 

14.7 

500 

48 

16.3 

17.9 

19.5 

21.1 

22.7 

24.2 

25.8 

27.4 

89.0 

30.6 

501 

48 

32.2 

33.8 

35.4 

37.0 

38.6 

40.1 

41.7 

43.3 

44.9 

46.5 

502 

48 

48.1 

49.7 

51.3 

52.9 

54.5 

56.0 

57.6 

59.2 

60.8 

62.4 

503 

48 

64.0 

65.6 

67.2 

68.7 

70.3 

71.9 

73.5 

75.1 

76.6 

78.2 

504 

48 

79.8 

81.4 

83.0 

84.5 

86.1 

87.7 

89.3 

90.9 

92.4 

94.0 

505 

48 

95.6 

97.2 

98.7 

505 

49 

00.3 

01.9 

03.4 

05.0 

06.6 

08.2 

09.7 

506 

49 

11.3 

12.9 

14.4 

16.0 

17.6 

19.1 

20.7 

22.3 

23.9 

25.4 

507 

49 

27.0 

28.6 

30.1 

31.7 

33.3 

34.8 

36.4 

38.0 

39.6 

41.1 

508 

49 

42.7 

44.3 

45.8 

47.4 

49.0 

50.5 

52.1 

53.7 

55.3 

56.8 

509 

49 

58.4 

60.0 

61.5 

63.1 

64.6 

66.2 

67.8 

69.3 

70.9 

72.4 

510 

'49 

74.0 

75.6 

77.1 

78.7 

80.2 

81.8 

83.4 

84.9 

86.5 

88.0 

511 

49 

89.6 

91.2 

92.7 

94.3 

95.8 

97.4 

99.0 

511 

50 

00.5 

02.1 

03.6 

512 

50 

05.2 

06.7 

08.3 

09.8 

11.4 

12.9 

14.5 

16.0 

17.6 

19.1 

513 

50 

20.7 

22.2 

23.8 

25.3 

26.9 

28.4 

30.0 

31.5 

33.1 

34.6 

514 

50 

36.2 

37.7 

39.3 

40.8 

42.4 

43.9 

45.5 

46.0 

48.6 

50.1 

515 

50 

51.7 

53.2 

54.8 

56.3 

57.9 

59.4 

6  IX) 

62.5 

64.1. 

65.6 

516 

50 

67.2 

68.7 

70.3 

71.8 

73.4 

74.9 

76.4 

78.0 

79.5 

81.1 

517 

50 

82.6 

84.1 

85.7 

87.2 

88.7 

90.2 

91.8 

93.3 

94.8 

96.4 

518 

50 

97.9 

99.4 

518 

51 

01.0 

02.5 

04.1 

05.6 

07.1 

08.7 

10.2 

11.8 

519 

51 

13.3 

14.8 

16.4 

17.9 

19.4 

20.9 

22.5, 

24.0 

25.5 

27.1 

520 

51 

28.6 

30.1 

31.7 

33.2 

34.7 

36.2 

37.8  ' 

39.3 

40.8 

42.4 

521 

51 

43.9 

45.4 

47.0, 

48.5 

50.0 

51.5 

53.1 

54.6 

56.1 

57.7 

522 

51 

59.2 

60.7 

62.2 

63.8 

65.3 

66.8 

68.3 

69.8 

71.4 

72.9 

523 

51 

74.4 

75.9 

77.5 

79.0 

80.5 

82.0 

83.6 

85.1 

86.6 

88.2 

524 

51 

89.7 

91.2 

92.7 

94.3 

95.8 

97.3 

98.8 

Barom- 
eter 
Horh. 

N. 

O.O 

0.1 

0.2 

0.3 

0.4 

0.5 

O.6 

0.7 

O.8 

0.9 

Parts 
or  each 
001mm. 

22 


BAROM  ETHICAL    MEASUREMENT    OF    HEIGHTS.  DELCROS. 


524  to  565mm-. 


Barom- 
eter 
Horh. 

N. 

o.o 

O.I 

0.2 

O.3 

O.4 

O.5 

0.6 

O.7 

O.8 

0.9 

Parts 
for  each 
0.01mm. 

Milli. 

Metr. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metr. 

524 

52 

00.3 

01.9 

03.4 

525 

52 

04.9 

06.4 

07.9 

09.4 

10.9 

12.4 

14.0 

15.5 

17.0 

18.5 

526 

52 

20.0 

21.5 

23.0 

24.5 

26.0 

27.5 

29.1 

30.6 

32.1 

33.6 

527 

52 

35.1 

36.6 

38.1 

39.6 

41.1 

42.6 

44.2 

45.7 

47.2 

48.7 

528 

52 

50.2 

51.7 

53.2 

54.7 

56.2 

57.7 

59.3 

60.8 

62.3 

63.8 

529 

52 

65.3 

66.8 

68.3 

69.8 

71.3 

72.8 

74.3 

75.8 

77.3 

78.8 

1 

0.1 

530 

52 

80.3 

81.8 

83.3 

84.8 

86.3 

87.8 

89.3 

90.8 

92.3 

93.8 

2 

0.3 

531 

52 

95.3 

96.8 

98.3 

99.8 

I 

0.4 

531 

53 

01.3 

02.8 

04.3 

05.8 

07.3 

08.8 

4 

0.6 

532 

53 

10.3 

11.8 

13.3 

14.8 

16.3 

17.8 

19.3 

20.8 

22.3 

23.8 

5 

0.7 

533 

53 

25.3 

26.8 

28.3 

29.8 

31.3 

32.7 

34.2 

35.7 

37.2 

38.7 

6 

0.9 

534 

53 

40.2 

41.7 

43.2 

44.7 

46.2 

47.6 

49.1 

50.6 

52.1 

53.6 

7 

1.0 

535 

53 

55.1 

56.5 

58.1 

59.6 

61.1 

62.5 

64.0 

65.5 

67.0 

68.5 

8 

1.2 

536 

53 

70.0 

71.5 

73.0 

74.4 

75.9 

77.4 

78.9 

80.4 

81.8 

83.3 

I 

1.3 

537 

53 

84.8 

86.3 

87.8 

89.2 

90.7 

92.2 

93.7 

95.2 

96.6 

98.1 

538 

53 

99.6 

538 

54 

01.1 

02.6 

04.0 

05.5 

07.0 

08.5 

10.0 

11.4 

12.9 

539 

54 

14.4 

15.9 

17.4 

18.8 

20.3 

21.8 

23.3 

24.8 

26.2 

27.7 

540 

54 

29.2 

30.7 

32.1 

33.6 

35.1 

36.5 

38.0 

39.5 

41.0 

42.4 

541 

54 

43.9 

45.4 

46.8 

48.3 

49.8 

51.2 

52.7 

54.2 

55.7 

57.1 

542 

54 

58,6 

60.1 

61.5 

63.0 

64.5 

66.0 

67.4 

68.9 

70.4 

71.8 

543 

54 

73.3 

74.8 

76.2 

77.7 

79.1 

80.6 

82.1 

83.5 

85.0 

86.4 

544 

54 

87.9 

89.4 

90.8 

92.3 

93.7 

95.2 

96.7 

98.1 

99.6 

544 

55 

01.0 

545 

55 

02.5 

04.0 

05.4 

06.9 

08.4 

09.8 

11.3 

12.8 

14.3 

15.7 

546 

55 

17.2 

18.7 

20.1 

21.6 

23.0 

24.5 

26.0 

27.4 

28.9 

30.3 

547 

55 

31.8 

33.3 

34.7 

36.1 

37.6 

39.0 

40.5 

41.9 

43.4 

44.8 

548 

55 

46.3 

47.7 

49.2 

50.6 

52.1 

53.5 

55.0 

56.4 

57.9 

59.3 

549 

55 

60.8 

62.2 

63.7 

65.1 

66.6 

68.0 

69.5 

70.9 

72.4 

73.8 

550 

55 

75.3 

76.7 

78.2 

79.6 

81.1 

82.5 

84.0 

85.4 

86.9 

88.3 

551 

55 

89.8 

91.2 

92.7 

94.1 

95.6 

97.0 

98.4 

99.9 

551 

56 

01.3 

02.8 

1 

0.1 

552 

56 

04.2 

05.6 

07.1 

08.5 

10.0 

11.4 

12.8 

14.3 

15.7 

17.2 

2 

0.3 

553 

56 

18.6 

20.0 

21.5 

22.9 

24.4 

25.8 

27.2 

28.7 

30.1 

31.6 

3 

0.4 

554 

56 

33.0 

34.4 

35.9 

37.3 

38.8 

40.2 

41.6 

43.1 

44.5 

46.0 

4 

0.6 

555 

56 

47.4 

48.8 

50.3 

51.7 

53.1 

54.5 

56.0 

57.4 

58.8 

60.3 

5 

0.7 

556 

56 

61.7 

63.1 

64.6 

66.0 

67.4 

68.8 

70.3 

71.7 

73.1 

74.6 

6 

0.9 

557 

56 

76.0 

77.4 

78.9 

80.3 

81.7 

83.1 

84.6 

86.0 

87.4 

88.9 

7 

1.0 

558 

57 

90.3 

91.7 

93.2 

94.6 

96.0 

97.4 

98.9 

8 

1.2 

558 

57 

00.3 

01.7 

03.2 

9 

1.3 

559 

57 

04.6 

06.0 

07.4 

08.9 

10.3 

11.7 

13.1 

14.5 

16.0 

17.4 

560 

57 

18.8 

20.2 

21.6 

23.1 

24.5 

25.9 

27.3 

28.7 

30.2 

31.6 

561 

57 

33.0 

34.4 

35.8 

37.3 

38.7 

40.1 

41.5 

42.9 

44.4 

45.8 

562 

57 

47.2 

48.6 

50.0 

51.4 

52.8 

54.2 

55.7 

57.1 

58.5 

59.9 

563 

57 

61.3 

62.7 

64.1 

65.5 

66.9 

68.3 

69.8 

71.2 

72.6 

74.0 

564 

57 

75.4 

76.8 

78.2 

79.6 

81.0 

82.4 

83.9 

85.3 

86.7 

88.1 

565 

57 

N. 

89.5 

90.9 

92.4 

93.8 

95.2 

96.6 

98.0 

99.4 

Barom- 
eter 
Horh 

O.O 

0.1 

0.2 

0.3 

0.4 

0.5 

0.6 

0.7 

0.8 

0.9 

Parts 
for  each 
0.01mm. 

D 


23 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS- UELCROS. 


565  to  6O5mm . 


B  irom- 
eter 
Horh. 

N. 

o.o 

O.I 

O.2 

0.3 

0.4 

0.5 

0.6 

0.7 

0.8 

O.9 

Parts 
for  each 
0.01mm. 

Milli. 

Metr. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metr. 

565 

58 

00.8 

02.2 

566 

58 

03.6 

05.0 

06.4 

07.8 

09.2 

10.6 

12.1 

13.5 

14.9 

16.3 

567 
568 

58 
58 

17.7 
31.7 

19. 
33. 

20.5 
34.5 

21.9 
35.9 

23.3 
37.3 

24.7 

38.7 

26.1 
40.1 

27.5 
41.5 

28.9 
42.9 

30.3 
44.3 

569 

58 

45.7 

47. 

48.5 

49.9 

51.3 

52.7 

54.1 

55.5 

56.9 

58.3 

570 

58 

59.7 

61. 

62.5 

63.9 

65.3 

66.7 

68.1 

69.5 

70.9 

72.3 

571 

58 

73.7 

75. 

76.5 

77.9 

79.3 

80.6 

82.0 

83.4 

84.8 

86.2 

572 

58 

87.6 

89.0 

90.4 

91.8 

93.2 

94.5 

95.9 

97.3 

98.7 

572 

59 

00.1 

573 

59 

01.5 

02.9 

04.3 

05.7 

07.1 

08.4 

09.8 

11.2 

12.6 

14.0 

574 

59 

15.4 

16.8 

18.2 

19.6 

21.0 

22.3 

23.7 

25.1 

26.5 

27.9 

575 

59 

29.3 

30.7 

32.1 

33.4 

34.8 

36.2 

37.6 

39.0 

40.3 

41.7 

576 

59 

43.1 

44.5 

45.9 

47.2 

48.6 

50.0 

51.4 

52.8 

54.1 

55.5 

1   0.1 

577 

59 

56.9 

58.3 

59.7 

61.0 

62.4 

63.8 

65.2 

66.6 

67.9 

69.3 

2   0.3 

578 

59 

70.7 

72.1 

73.5 

74.8 

76.2 

77.6 

79.0 

80.4 

81.7 

83.1 

3   0.4 

579 

59 

84.5 

85.9 

87.2 

88.6 

90.0 

91.3 

92.7 

94.1 

95.5 

96.8 

4   0.5 

580 

59 

98.2 

99.6 

5   0.7 

580 

60 

00.9 

02.3 

03.7 

05.0 

06.4 

07.8 

09.2 

10.5 

6   0.8 

Q81 

60 

11.9 

13.3 

14.6 

16.0 

17.4 

18.7 

20.1 

21.5 

22.9 

24.2 

7    1.0 

582 

60 

25.6 

27.0 

28.3 

29.7 

31.1 

32.4 

33.8 

35.2 

36.6 

37.9 

8    1.1 

583 

60 

39.3 

40.7 

42.0 

43.4 

44.7 

46.1 

47.5 

48.8 

50.2 

51.5 

9    1.2 

584 

60 

52.9 

54.3 

55.6 

57.0 

58.4 

59.7 

61.1 

62.5 

63.9 

65.2 

585 

60 

66.6 

68.0 

69.3 

70.7 

72.0 

73.4 

74.8 

76.1 

77.5 

78.8 

536 

60 

80.2 

81.6 

82.9 

84.3 

85.6 

87.0 

88.4 

89.7 

91.1 

92.4 

587 

60 

93.8 

95.1 

96.5 

97.8 

99.2 

587 

61 

00.5 

01.9 

03.2 

04.6 

05.9 

588 

61 

07.3 

08.6 

10.0 

11.3 

12.7 

14.0 

15.4 

16.7 

18.1 

19.4 

589 

61 

20.8 

22.1 

23.5 

24.8 

26.2 

27.5 

28.9 

30.2 

31.6 

32.9 

590 

61 

34.3 

35.6 

37.0 

38.3 

39.7 

41.0 

42.4 

43.7 

45.1 

46.4 

591 

61 

47.8 

49.1 

50.5 

51.8 

53.2 

54.5 

55.9 

57.2 

58.6 

59.9 

592 

61 

61.3 

62.6 

64.0 

65.3 

66.7 

68.0 

69.3 

70.7 

72.0 

73.4 

593 

61 

74.7 

76.0 

77.4 

78.7 

80.1 

81.4 

82.7 

84.1 

85.4 

86.8 

594 

61 

88.1 

89.4 

90.8 

92.1 

93.5 

94.8 

96.1 

97.5 

98.8 

594 
595 

.  62 
62 

01.5 

02.8 

04.2 

05.5 

06.9 

08.2 

09.5 

10.9 

12.2 

00.2 
13.6 

1 

596 

62 

14.9 

16.2 

17.6 

18.9 

20.2 

21.5 

22.9 

24.2 

25.5 

26.9 

597 

62 

28.2 

29.5 

30.9 

32.2 

33.6 

34.9 

36.2 

37.6 

33.9 

40.3 

598 

62 

41.6 

42.9 

44.3 

45.6 

46.9 

48.2 

49.6 

50.9 

52.2 

53.6 

599 

62 

54.9 

56.2 

57.6 

58.9 

60.2 

61.5 

62.9 

64.2 

65.5 

66.9 

600 

62 

68.2 

69.5 

70.8 

72.2 

73.5 

74.8 

76.1 

77.4 

78.8 

80.1 

601 

62 

81.4 

82.7 

84.1 

85.4 

86.7 

88.0 

89.4 

90.7 

92.0 

93.4 

602 

62 

94.7 

96.0 

97.3 

98.7 

602 

63 

00.0 

01.3 

02.6 

03.9 

05.3 

06.6 

603 

63 

07.9 

09.2 

10.5 

11.9 

13.2 

14.5 

15.8 

17.1 

18.5 

19.8 

604 

63 

21.1 

22.4 

23.7 

25.1 

26.4 

27.7 

29.0 

30.3 

31.7 

33.0 

605 

63 

34.3 

35.6 

36.9 

38.2 

39.5 

40.8 

42.2 

43.5 

44.8 

46.1 

Barom- 
eter 
Horh. 

N. 

O.O 

0.1 

O.2 

O.3 

0.4 

0.5 

0.6 

O.7 

O.8 

0.9 

Parts 
for  each 
0.01mm. 

D 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. UELCROS. 


606  to  647mr 


Barom- 
eter 
H  or  h. 

N. 

o.o 

O.I 

0.2 

0.3 

O.4 

0.5 

0.6 

O.7 

Metres. 

0.8 

0.9 

Parts 
for  each 
0.01  mrn. 

Milli. 

Metr. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metr. 

606 

63 

47.4 

48.7 

50.0 

51.3 

52.6 

53.9 

55.3 

56.6 

57.9 

59.2 

607 

63 

60.5 

61.8 

63.1 

64.5 

65.8 

67.1 

68.4 

69.7 

71.1 

72.4 

608 

63 

73.7 

75.0 

76.3 

77.6 

78.9 

80.2 

81.5 

82.8 

84.1 

85.4 

609 

63 

86.7 

88.0 

89.3 

90.6 

91.9 

93.2 

94.6 

95.9 

97.2 

98.5 

610 

63 

99.8 

610 

64 

01.1 

02.4 

03.7 

05.0 

06.3 

07.6 

08.9 

10.2 

11.5 

611 

64 

12.8 

14.1 

15.4 

16.7 

18.0 

19.3 

20.7 

22.0 

23.3 

24.6 

612 

64 

25.9 

27.2 

28.5 

29.8 

31.1 

32.4 

33.7 

35.0 

36.3 

37.6 

613 

64 

38.9 

40.2 

41.5 

42.8 

44.1 

45.4 

46.7 

48.0 

49.3 

50.6 

614 

64 

51.9 

53.2 

54.5  . 

55.8 

57.1 

58.3 

59.6 

60.9 

62.2 

63.5 

615 

64 

64.8 

66.1 

67.4 

68.7 

70.0 

71.2 

72.5 

73.8 

75.1 

76.4 

616 

64 

77.7 

79.0 

80.3 

81.6 

82.9 

84.2 

85.5 

86.8 

88.1 

89.4 

617 

64 

90.7 

92.0 

93.3 

94.6 

95.9 

97.1 

98.4 

99.7 

617 

65 

01.0 

02.3 

618 

65 

03.6 

04.9 

06.2 

07.4 

08.7 

10.0 

11.3 

12.6 

13.8 

15.1 

619 

65 

16.4 

17.7 

19.0 

20.3 

21.6* 

22.8 

24.1 

25.4 

26.7 

28.0 

620 

65 

29.3 

30.6 

31.9 

33.1 

34.4 

35.7 

37.0 

38.3 

39.5 

40.8 

621 

65 

42.1 

43.4 

44.7 

45.9 

47.2 

48.5 

49.8 

51.1 

52.3 

53.6 

1   0.1 

622 

65 

54.9 

66.2 

57.5 

58.7 

60.0 

61.3 

62.6 

63.9 

65.1 

66.4 

2   0.2 

623 

65 

67.7 

69.0 

70.3 

71.5 

72.8 

74.1 

75.4 

76.7 

77.9 

79.2 

3   0.4 

624 

65 

80.5 

81.8 

83.0 

84.3 

85.6 

86.8 

88.1 

89.4 

90.7 

91.9 

4   0.5 

5   0.6 

625 

65 

93.2 

94.5 

95.8 

97.0 

98.3 

99.6 

6   0.8 

625 

66 

00.9 

02.2 

03.4 

04.7 

7   0.9 

626 

66 

06.0 

07.3 

08.5 

09.8 

11.1 

12.3 

13.6 

14.9 

16.2 

17.4 

8    1.0 

627 

66 

1S.7 

20.0 

21.2 

22.5 

23.8 

25.0 

26.3 

27.6 

28.9 

30.1 

9    1.1 

628 

66 

31.4 

32.7 

33.9 

36.2 

56.4 

37.7 

39.0 

40.2 

41.5 

42.7 

629 

66 

44.0 

45.3 

46.5 

47.8 

49.1 

50.3 

51.6 

52.9 

54.2 

55.4 

630 

66 

56.7 

58.0 

59.2 

60.5 

61.7 

63.0 

64.3 

65.5 

66.8 

68.0 

631 

66 

69.3 

70.6 

71.8 

73.1 

74.4 

75.6 

76.9 

78.2 

79.5 

80.7 

632 

66 

82.0 

83.2 

84.5 

85.7 

87.0 

88.2 

89.5 

90.7 

92.0 

93.2 

633 

66 

94.5 

95.8 

97.0 

98.3 

99.5 

633 

67 

00.8 

02.1 

03.3 

04.6 

05.8 

634 

67 

07.1 

08.4 

09.6 

10.9 

12.1 

13.4 

14.7 

15.9 

17.2 

18.4 

635 

67 

19.7 

20.9 

22.2 

23.4 

24.7 

25.9 

27.2 

28.4 

29.7 

30.9 

636 

67 

32.2 

33.4 

34.7 

35.9 

37.2 

38.4 

39.7 

40.9 

42.2 

43.4 

637 

67 

44.7 

45.9 

47.2 

48.4 

49.7 

50.9 

52.2 

53.4 

54.7 

55.9 

638 

67 

57.2 

58.4 

59.7 

60.9 

62.2 

63.4 

64.7 

65.9 

67.2 

68.4 

639 

67 

69.7 

70.9 

72.2 

73.4 

74.7 

75.9 

77.1 

78.4 

79.6 

80.9 

640 

67 

82.1 

83.3 

84.6 

85.8 

87.1 

88.3 

89.6 

90.8 

92.1 

93.3 

641 

67 

94.6 

95.8 

97.1 

98.3 

99.6 

641 

63 

00.8 

02.0 

03.3 

04.5 

05.8 

642 

68 

07.0 

08.2 

09.5 

10.7 

12.0 

13.2 

14.4 

15.7 

16.9 

18.2 

643 

68 

19.4 

20.6 

21.9 

23.1 

24.3 

25.5 

26.8 

28.0 

29.2 

30.5 

644 

68 

31.7 

32.9 

34.2 

35.4 

36.7 

37.9 

39.1 

40.4 

41.6 

42.9 

645 

68 

44.1 

45.3 

46.6 

47.8 

49.0 

50.2 

51.5 

52.7 

53.9 

55.2 

646 

68 

56.4 

57.6 

58.9 

60.1 

61.3 

62.5 

63.8 

65.0 

66.2 

67.5 

647 

68 

68.7 

69.9 

71.2 

72.4 

73.6 

74.8 

76.1 

77.3 

78.5 

79.8 

Barom- 
eter 
Horh. 

N. 

O.O 

0.1 

0.2 

0.3 

0.4 

0.5 

0.6 

O.7 

O.8 

O.9 

Parts 
for  each 
O.Olmm. 

D 


25 


10 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  DELCROS. 


648   to  689' 


i  ',  Barotn- 
';    eter 
,'Horh. 

N. 

o.o 

O.I 

O.2 

O.3 

0.4 

O.5 

O.6 

O.7 

O.8 

0.9 

Parts 
for  each 
0.01mm. 

Milli. 

Metr. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metr. 

:    648 

68 

81.0 

82.2 

83.5 

84.7 

85.9 

87.1 

88.4 

89.6 

90.8 

92.1 

649 

68 

93.3 

94.5 

95.8 

97.0 

98.2 

99.4 

649 

69 

00.7 

01.9 

03.1 

04.4 

650 

69 

05.6 

06.8 

08.0 

09.3 

10.5 

11.7 

12.9 

14.1 

15.4 

16.6 

651 

69 

17.8 

19.0 

20.2 

21.5 

22.7 

23.9 

25.1 

26.3 

27.6 

28.8 

652 

69 

30.0 

31.2 

32.4 

33.7 

34.9 

36.1 

37.3 

38.5 

39.8 

41.0 

653 

69 

42.2 

43.4 

44.6 

45.9 

47.1 

48.3 

49.5 

50.7 

52.0 

53.2 

654 

69 

54.4 

55.6 

56.8 

58.1 

59.3 

60.5 

61.7 

62.9 

64.2 

65.4 

655 

69 

66.6 

67.8 

69.0 

70.2 

71.4 

72.6 

73.9 

75.1 

76.3 

77.5 

656 

69 

78.7 

79.9 

81.1 

82.4 

83.6 

84.8 

86.0 

87.2 

88.5 

89.7 

657 

69 

90.9 

92.1 

93.3 

94.5 

95.7 

96.9 

98.2 

99.4 

657 

70 

00.6 

01.8 

658 

70 

03.0 

04.2 

05.4 

06.6 

07.8 

09.0 

10.3 

11.5 

12.7 

13.9 

659 

70 

15.1 

16.3 

17.5 

18.7 

19.9 

21.1 

22.4 

23.6 

24.8 

26.0 

660 

70 

27.2 

28.4 

29.6 

30.8 

ae.o 

33.2 

34.4 

35.6 

36.8 

38.0 

1 

0.1 

661 

70 

39.2 

40.4 

41.6 

42.8 

44.0 

45.2 

46.4 

47.6 

48.8 

50.0 

2 

0.2 

662 

70 

51.2 

52.4 

53.6 

54.8 

56.0 

57.2 

58.5 

59.7 

60.9 

62.1 

3 

0,4 

663 

70 

63.3 

64.5 

65.7 

66.9 

68.1 

69.3 

70.5 

71.7 

72.9 

74.1 

4 

0.5 

664 

70 

75.3 

76.5 

77.7 

78.9 

80.1 

81.2 

82.4 

83.6 

84.8 

86.0 

5 

0.6 

665 

70 

87.2 

88.4 

89.6 

90.8 

92.0 

93.2 

94.4 

95.6 

96.8 

98.0 

6 

0.7 

666 

70 

99.2 

7 

0.8 

666 

71 

00.4 

01.6 

02.8 

04.0 

05.2 

06.4 

07.6 

08.8 

10.0 

8 

1.0 

667 

71 

11.2 

12.4 

13.6 

14.8 

16.0 

17.1 

18.3 

19.5 

20.7 

21.9 

9 

1.1 

668 

71 

23.1 

24.3 

25.5 

26.7 

27.9 

29.0 

30.2 

31.4 

32.6 

33.8 

669 

71 

35.0 

36.2 

37.4 

38.6 

39.8 

40.9 

42.1 

43.3 

44.5 

45.7 

670 

71 

46.9 

48.1 

49.3 

50.5 

51.7 

52.8 

54.0 

55.2 

56.4 

57.6 

671 

71 

58.8' 

60.0 

61.2 

62.3 

63.5 

64.7 

65.9 

67.1 

68.2 

69.4 

672 

71 

70.6 

71.8 

73.0 

74.2 

75.4 

76.5 

77.7 

78.9 

80.1 

81.3 

673 

71 

82.5 

83.7 

84.9 

86.0 

87.2 

88.4 

89.6 

90.8 

91.9 

93.1 

674 

71 

94.3 

95.5 

96.7 

97.8 

99.0 

674 

72 

00.2 

01.4 

02.6 

03.7 

04.9 

675 

72 

06.1 

07.3 

08.5 

09.6 

10.8 

12.0 

13.2 

14.4 

15.5 

16.7 

676 

72 

17.9 

19.1 

20.3 

21.4 

22.6 

23.8 

25.0 

26.2 

27.3 

28.5 

677 

72 

29.7 

30.9 

32.0 

33.2 

34.4 

35.5 

36.7 

37.9 

39.1 

40.2 

678 

72 

41.4 

42.6 

43.8 

44.9 

46.1 

47.3 

48.5 

49.7 

50.8 

52.0 

679 

72 

53.2 

54.4 

55.5 

56.7 

57.9 

59.0 

60.2 

61.4 

62.6 

63.7 

680 

72 

64.9 

66.1 

67.2 

68.4 

69.6 

70.7 

71.9 

73.1 

74.3 

75.4 

681 

72 

76.6 

77.8 

78.9 

80.1 

81.3 

82.4 

83.6 

84.8 

86.0 

87.1 

1 

0.1 

682 

72 

88.3 

89.5 

90.6 

91.8 

93.0 

94.1 

95.3 

96.5 

97.7 

98.8 

2 

0.2 

683 

73 

00.0 

01.2 

02.3 

03.5 

04.6 

05.8 

07.0 

08.1 

09.3 

10.4 

3 

0.3 

684 

73 

11.6 

12.8 

13.9 

15.1 

16.2 

17.4 

18.6 

19.7 

20.9 

22.0 

4 

0.5 

685 

73 

23.2 

24.4 

25.5 

26-7 

27.8 

29.0 

30.2 

31.3 

32.5 

33.6 

5 

0.6 

686 

73 

34.8 

36.0 

37.1 

38.3 

39.4 

40.6 

41.8 

42.9 

44.1 

45.2 

6 

0.7 

687 

73 

46.4 

47.6 

48.7 

49.9 

51.0 

52.2 

53.4 

54.5 

55.7 

56.8 

7 

0.8 

688 

73 

58.0 

59.2 

60.3 

61.5 

62.6 

63.8 

65.0 

66.1 

67.3 

68.4 

8 

0.9 

689 

73 

69.6 

70.7 

71.9 

73.0 

74.2 

75.3 

76.5 

77.6 

78.8 

79.9 

9 

1.1 

Barom- 
eter 
Horh 

N. 

0.0 

0.1 

o.a 

0.3 

0.4 

0.5 

O.6 

0.7 

O.8 

0.9 

Parts 
for  each 
0.01mm. 

I) 


26 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  DKLCROS. 


11 


69O  to  73Orara-. 


Barom- 
eter 
Horh. 

N. 

0.0 

0.1 

0.2 

0.3 

O.4 

0.5 

0.6 

O.7 

O.8 

0.9 

Parts 
for  each 
0.01mm. 

Milli. 

Metr. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metr. 

690 

73 

81.1 

82.3 

83.4 

84.6 

85.7 

86.9 

88.1 

89.2 

90.4 

91.5 

691 

73 

92.7 

93.8 

95.0 

96.1 

97.3 

98.4 

99.6 

691 

74 

00.7 

01.9 

03.0 

692 

74 

04.2 

05.3 

06.5 

07.6 

08.8 

09.9 

11.1 

12.2 

13.4 

14.5 

693 

74 

15.7 

16.8 

18.0 

19.1 

20.3 

21.4 

22.6 

23.7 

24.9 

26.0 

694 

74 

27.2 

28.3 

29.5 

30.6 

31.8 

32.9 

34.1 

35.2 

36.4 

37.5 

695 

74 

38.7 

39.8 

41.0 

42.1 

43.3 

44.4 

45.5 

46.7 

47.8 

49.0 

696 

74 

50.1 

51.2 

52.4 

53.5 

54.7 

55.8 

56.9 

58.1 

59.2 

60.4 

697 

74 

61.5 

62.6 

63.8 

64.9 

66.1 

67.2 

68.3 

69.5 

70.6 

71.8 

698 

74 

72.9 

74.0 

75.2 

76.3 

77.5 

78.6 

79.7 

80.9 

82.0 

83.2 

699 

74 

84.3 

85.4 

86.6 

87.7 

88.9 

90.0 

91.1 

92.3 

93.4 

94.6 

700 

74 

95.7 

96.8 

98.0 

99.1 

700 

75 

00.3 

01.4 

02.5 

03.7 

04.8 

06.0 

701 

75 

07.1 

08.2 

09.4 

10.5 

11.6 

12.7 

13.9 

15.0 

16.1 

17.3 

702 

75 

18.4 

19.5 

20.7 

21.8 

23.0 

24.1 

25.2 

26.4 

27.5 

28.7 

703 

75 

29.8 

30.9 

32.1 

33.2 

34.3 

35.4 

36.6 

37.7 

38.8 

40.0 

704 

75 

41.1 

42.2 

43.4 

44.5 

45.6 

46.7 

47.9 

49.0 

50.1 

51.3 

703 

75 

52.4 

53.5 

54.7 

55.8 

56.9 

58.0 

59.2 

60.3 

61.4 

62.6 

706 

75 

63.7 

64.8 

66.0 

67-1 

68.2 

69.3 

70.5 

71.6 

72.7 

73.9 

707 

75 

75.0 

76.1 

77.2 

78.4 

79.5 

80.6 

81.7 

82.8 

84.0 

85.1 

708 

75 

86.2 

87.3 

88.5 

89.6 

90.7 

91.8 

93.0 

94.1 

95.2 

96.4 

709 

75 

97.5 

98.6 

99.7 

i 

709 

76 

00.9 

02.0 

03.1 

04.2 

05.3 

06.5 

07.6 

710 

76 

08.7 

09.8 

10.9 

12.1 

13.2 

14.3 

15.4 

16.5 

17.7 

18.8 

711 

76 

19.9 

21.0 

22.1 

23.3 

24.4 

25.5 

26.6 

27.7 

28.9 

30.0 

712 

76 

31.1 

32.2 

33.3 

34.4 

35.5 

36.6 

37.8 

38.9 

40.0 

41.1 

1   0.1 

713 

76 

42.2 

43.3 

44.4 

45.6 

46.7 

47.8 

48.9 

50.0 

51.2 

52.3 

2   0.2 

714 

76 

53.4 

54.5 

55.6 

56.8 

57.9 

59.0 

60.1 

61.2 

62.4 

63.5 

3   0.3 

715 

76 

64.6 

65.7 

66.8 

67.9 

69.0 

70.1 

71.3 

72.4 

73.5 

74.6 

4   0.4 

716 

76 

75.7 

76.8 

77.9 

79.0 

80.1 

81.2 

82.4 

83.5 

84.6 

85.7 

5   0.5 

717 

76 

86.8 

87.9 

89.0 

90.1 

91.2 

92.3 

93.5 

94.6 

95.7 

96.8 

6   0.7 

718 

76 

97^9 

99.0 

7   0.8 

718 

77 

00.1 

01.2 

02.3 

03.4 

04.6 

05.7 

06.8 

07.9 

8   0.9 

719 

77 

09.0 

10.1 

11.2 

12.3 

13.4 

14.5 

15.7 

16.8 

17.9 

19.0 

9    1.0 

720 

77 

20.1 

21.2 

22.3 

23.4 

24.5 

25.6 

26.7 

27.8 

28.9 

30.0 

721 

77 

31.1 

32.2 

33.3 

34.4 

35.5 

36.6 

37.7 

38.8 

39.9 

41.0 

722 

77 

42.1 

43.2 

44.3- 

45.4 

46.5 

47.6 

48.7 

49.8 

50.9 

52.0 

723 

77 

53.1 

54.2 

55.3 

56.4 

57.5 

58.6 

59.8 

60.9 

62.0 

63.1 

724 

77 

64.2 

65.3 

66.4 

67.5 

68.6 

69.6 

70.7 

71.8 

72.9 

74.0 

725 

77 

75.1 

76.2 

77.3 

78.4 

79.5 

80.6 

81?7 

82.8 

83.9 

85.0 

726 

77 

86.1 

87.2 

88.3 

89.4 

90.5 

91.6 

92.7 

93.8 

94.9 

96.0 

727 

77 

97.1 

98.2 

99.3 

727 

78 

00.4 

01.5 

02.5 

03.6 

04.7 

05.8 

06.9 

728 

78 

08.0 

09.1 

10.2 

11.3 

12.4 

13.5 

14.6 

15.7 

16.8 

17-9 

729 

78 

19.0 

20.1 

21.2 

22.3 

23.4 

24.4 

25.5 

26.6 

27.7 

28.8 

730 

78 

29.9 

31.0 

32.1 

33.3 

34.3 

35.3 

36.4 

37.5 

38.6 

39,7 

Barom- 
eter 
Horh. 

N. 

0.0 

O.I 

O.2 

0.3 

O.4 

O.5 

O.6 

O.7 

0.8 

0.9 

Parts 
ror  each 
001mm. 

D 


27 


12 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  DELCROS. 


731     tO    770mra«. 


Barom- 

Parts 

eter 
Horh. 

N. 

0.0 

O.I 

O.2 

0.3 

0.4 

0.5 

0.6 

0.7 

0.8 

O.9 

for  each 
0.01mm. 

Milli. 

Metr. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metr. 

731 

78 

40.8 

41.9 

43.0 

44.1 

45.2 

46.2 

47.3 

48.4 

49.5 

50.6 

732 

78 

51.7 

52.8 

53.9 

54.9 

56.0 

57.0 

58.2 

59.3 

60.3 

61.4 

Y33 

78 

62.5 

63.6 

64.7 

65.8 

66.9 

67.9 

69.0 

70.1 

71.2 

72.3 

734 

78 

73.4 

74.5 

75.6 

76.6 

77.7 

78.8 

79.9 

81.0 

82.0 

83.1 

735 

78 

84.2 

85.3 

86.4 

87.5 

88.6 

89.6 

90.7 

91.8 

92.9 

94.0 

736 

78 

95.1 

96.2 

97.3 

98.3 

99.4 

736 

79 

00.5 

01.6 

02.7 

03.7 

04.8 

737 

79 

05.9 

07.0 

08.1 

09.1 

10.2 

11.3 

12.4 

13.5 

14.5 

15.6 

738 

79 

16.7 

17.8 

18.9 

19.9 

21.0 

22.1 

23.2 

24.3 

25.3 

26.4 

739 

79 

27.5 

28.6 

29.6 

30.7 

31.8 

32.8 

33.9 

35.0 

36.1 

37.1 

740 

79 

38.2 

39.3 

40.4 

41.4 

42.5 

43.6 

44.7 

45.8 

46.8 

47.9 

741 

79 

49.0 

50.1 

51.1 

52.2 

53.3 

54.3 

55.* 

56.5 

57.6 

58.6 

742, 

79 

59.7 

60.8 

61.8 

62.9 

64.0 

65.0 

66.1 

67.2 

68.3 

69.3 

743 

79 

70.4 

71.5 

72.6 

73.6 

74.7 

75.8 

76.9 

78.0 

79.0 

80.1 

744 

79 

81.2 

82.3 

83.3 

84.4 

85.5 

86.5 

87.6 

88.7 

89.8 

90.8 

745 

79 

91.9 

93.0 

94.0 

95.1 

96.1 

97.2 

98.3 

99.3 

745 

80 

00.4 

01.4 

746 

80 

02.5 

03.6 

04.6 

05.7 

06.8 

07.8 

08.9 

10.0 

11.1 

12.3 

747 

80 

13.2 

14.3 

15.3 

16.4 

17.4 

18.5 

19.6 

20.6 

21.7 

22.7 

748 

80 

23.8 

24.9 

25.9 

27.0 

28.0 

29.1 

30.2 

31.2 

32.3 

33.3 

749 

80 

34.4 

35.5 

36.5 

37.6 

38.7 

39.7 

40.8 

41.9 

43.0 

44.0 

^50 

80 

45.1 

46.2 

47.3 

48.4 

49.4 

50.5 

51.6 

52.6 

53.7 

54.7 

751 

80 

55.7 

56.8 

57.8 

58.9 

59.9 

61.0 

62.1 

63.1 

64.2 

65.2 

752 

80 

66.3 

67.4 

68.4 

69.5 

70.5 

71.6 

72.7 

73.7 

74.8 

75.8 

753 

80 

76.9 

78.0 

79.0 

80.1 

81.1 

82.2 

83.3 

84.3 

85.4 

86.4 

754 

80 

87.5 

88.5 

89.6 

90.6 

91.7 

92.7 

93.8 

94.8 

95.9 

96.9 

1   0.1 

755 

80 

98.0, 

99.1 

2   0.2 

755 

81 

00.1 

01.2 

02.2 

03.3 

04.4 

05.4 

06.5 

07.5 

3   0.3 

756 

81 

08.6 

09.6 

10.7 

11.7 

12.8 

13.8 

14.9 

15.9 

17.0 

18.0 

4   0.4 

757 

81 

19.1 

20.1 

21.2 

22.2 

23.3 

24.3 

25.4 

26.4 

27.5 

28.5 

5   0.5 

758 

81 

29.6 

30.6 

31.7 

32.7 

33.8 

34.8 

35.9 

36.9 

38.0 

39.0 

6   0.6 

759 

81 

40.1 

41.1 

42.2 

43.2 

44.3 

45.3 

46.4 

47.4 

48.5 

49.5 

7   0.7 

8   0.8 

760 

81 

50.6 

51.6 

52.7 

53.7 

54.8 

55.8 

56.9 

57.9 

59.0 

60.0 

9   0.9 

761 

81 

61.1 

62.1 

63.2 

64.2 

65.3 

66.3 

67.3 

68.4 

69.4 

70.5 

762 

81 

71.5 

72.5 

73.6 

74.6 

75.7 

76.7 

77.8 

78.8 

79.9 

80.9 

763 

81 

82.0 

83.0 

84.1 

85.1 

86.2 

87.2 

88.2 

89.3 

90.3 

91.4 

764 

81 

92.4 

93.4 

94.5 

95.5 

96.6 

97.6 

98.6 

99.7 

764 

82 

00.7 

01.8 

765 

82 

02.8 

03.8 

04.9 

05.9 

07.0 

08.0 

09.0 

10.1 

11.1 

12.2 

766 

82 

13.2 

14.2 

15.3 

16.3 

17.4 

18.4 

19.4 

20.5 

21.5 

22.6 

767 

82 

23.6 

24.6 

25.7 

26.7 

27.8 

28.8 

29.8 

30.9 

31.9 

33.0 

768 

82 

34.0 

35.0 

36.1 

37.1 

38.2 

39.2 

40.2 

41.3 

42.3 

43.4 

769 

82 

44.4 

45.4 

46.5 

47.5 

48.5 

49.5 

50.6 

51.6 

52.6 

53.7 

770 

82 

54.7 

55.7 

56.8 

57.8 

58.8 

59.8 

60.9 

61.9 

62.9 

64.0 

Barom- 
eter 

N. 

0.0 

0.1 

0.2 

0.3 

0.4 

0.5 

O.6 

0.7 

0.8 

O.9 

Parts 
or  each 

Horh. 

.Olmm. 

D 


28 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. BELCROS. 


13 


771   to  81Omm-. 


Barom- 
eter 
Horh. 

N. 

0.0 

0.1 

0.2 

O.3 

0.4 

O.5 

O.6 

O.7 

0.8 

0.9 

Parts 
for  each 
0.01mm. 

Milli. 

Metr. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metr. 

771 

82 

65.0 

66.0 

67.1 

68.1 

69.2 

70.2 

71.2 

72.3 

73.3 

74.4 

772 

82 

75.4 

76.4 

77.5 

78.5 

79.5 

80.5 

81.6 

82.6 

83.6 

84.7 

773 

82 

85.7 

86.7 

87.8 

88.8 

89.8 

90.8 

91.9 

92.9 

93.9 

95.0 

774 

82 

96.0 

97.0 

98.0 

99.1 

774 

83 

00.1 

01.1 

02.1 

03.1 

04.2 

05.2 

775 

83 

06.2 

07.2 

08.3 

09.3 

10.3 

11.3 

12.4 

13.4 

14.4 

15.5 

776 

83 

16.5 

17.5 

18.5 

19.6 

20.6 

21.6 

22.6 

23.6 

24.7 

25.7 

777 

83 

26.7 

27.7 

28.8 

29.8 

30.8 

31.8 

32.9 

33.9 

34.9 

36.0- 

778 

83 

37.0 

38.0 

39.0 

40.1 

41.1 

42.1 

43.1 

44.1 

45.2 

46.2 

779 

83 

47.2 

48.2 

49.2 

50.3 

51.3 

52.3 

53.3 

54.3 

55.4 

56.4 

780 

83 

57.4 

58.4 

59.4 

60.5 

61.5 

62.5 

63.5 

64.5 

65.6 

66.6 

781 

83 

67.6 

68.6 

69.6 

70.7 

71.7 

72.7 

73.7 

74.7 

75.8 

76.8 

782 

83 

77.8 

78.8 

79.8 

80.9 

81.9 

82.9 

83.9 

84.9 

86.0 

87.0 

783 

83 

88.0 

89.0 

90.0 

91.1 

92.1 

93.1 

94.1 

95.1 

96.2 

97.2 

784 

83 

98.2 

99.2 

784 

84 

00.2 

01.2 

02.2 

03.2 

04.3 

05.3 

06.3 

07.3 

785 

84 

08.3 

09.3 

10.3 

11.4 

12.4 

13.4 

14.4 

15.4 

16.5 

17.5 

786 

84 

18.5 

19.5 

20.5 

21.5 

22.5 

23.5 

24.6 

25.6 

26.6 

27.6 

787 

84 

28.6 

29.6 

30.6 

31.6 

32.6 

33.6 

34.7 

35.7 

36.7 

37.7 

788 

84 

38.7 

39.7 

40.7 

41.7 

42.7 

'43.7 

44.8 

45.8 

46.8 

47.8 

789 

84 

48.8 

49.8 

50.8 

51.8 

52.8 

53.8 

54.9 

55.9 

56.9 

57.9 

790 

84 

58.9 

59.9 

60.9 

61.9 

62.9 

63.9 

65.0 

66.0 

67.0 

68.0 

791 

84 

68.9 

69.9 

70.9 

71.9 

72.9 

73.9 

75.0 

76.0 

77.0 

78.0 

1   0.1 

792 

84 

79.0 

80.0 

81.0 

82.0 

83.0 

84.0 

85.0 

86.0 

87.0 

88.0 

2   0.2 

793 

84 

89.0 

90.0 

91.0 

92.0 

93.0 

94.0 

95.1 

96.1 

97.1 

98.1 

3   0.3 

794 

84 

99.1 

4  0.4 

794 

85 

00. 

01. 

02. 

03. 

04.1 

05.1 

06. 

07. 

08.1 

5   0.5 

795 

85 

09.1 

10. 

11. 

12. 

13. 

14.1 

15.1 

16. 

17. 

18.1 

6   0.6 

796 

85 

19.1 

20. 

21. 

22. 

23. 

24.1 

25.1 

26. 

27. 

28.1 

7  0.7 

797 

85 

29.1 

30. 

31. 

32. 

33. 

34.1 

35.1 

36. 

37. 

38.1 

8   0.8 

798 

85 

39.1 

40. 

41. 

42. 

43.1 

44.1 

45.1 

46. 

47. 

48.1 

9   0.9 

799 

85 

49.1 

50. 

51.1 

52.0 

53.0 

54.1 

55.0 

56.0 

57.0 

58.0 

800 

85 

59.0 

60.0 

61.0 

62.0 

63.0 

64.0 

65.0 

66.0 

67.0 

68.0 

801 

85 

69.0 

70.0 

70.9 

71.9 

72.9 

73.9 

74.9 

75.9 

76.9 

77.9 

802 

85 

78.9 

79.9 

80.9 

81.9 

82.9 

83.9 

84.9 

85.8 

86.8 

87.8 

803 

85 

88.8 

89.8 

90.8 

91.8 

92.8 

93.8 

94.8 

95.8 

96.7 

97.7 

804 

85 

98.7 

99.7 

804 

86 

00.7 

01.7 

02.7 

03.7 

04.7 

05.7 

06.6 

07.6 

805 

86 

08.6 

09.6 

10.6 

11.6 

12.6 

13.6 

14.6 

15.5 

16.5 

17.5 

806 

86 

18.5 

19.5 

20.5 

21.5 

22.5 

23.4 

24.4 

25.4 

26.4 

27.4 

807 

86 

28.4 

29.4 

30.4 

31.3 

32.3 

33.3 

34.3 

35.3 

36.3 

37.3 

808 

86 

38.3 

39.2 

40.2 

41.2 

42.2 

43.2 

44.2 

45.1 

46.1 

47.1 

809 

86 

48.1 

49.1 

50.1 

51.1 

52.0 

53.0 

54.0 

55.0 

56.0 

57.0 

810 

86 

57.9 

58.9 

59.9 

60.9 

61.9 

62.8 

63.8 

64.8 

65.8 

66.8 

Barom- 
eter 
Horh. 

N. 

o.o 

O.I 

O.2 

0.3 

O.4 

O.5 

O.6 

0.7 

O.8 

0.9 

Parts 
"or  each 
0.01mm. 

D 


29 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 


DELCROS. 


TABLE  II.  CORRECTION  FOR  DIFFERENCE  OF  TEMPERATURE  or  ATTACHED  THERMOMETERS. 

Temperature  of  Barometers  at  Station  ]  ^  ^*!£  II  rn 


T'  —  T 

Centig. 

Correct. 

Metres. 

T'-T 

Centigrade. 

Correct.  ' 
Metres. 

T'  —  T 

Centigrade. 

Correct. 
Metres. 

T'  —  T 

Centigrade. 

Correct. 
Metres. 

T'-T 
Centigrade. 

Correct. 
Metres. 

0.0 

0.0 

8.0 

10.3 

16.0 

20.6 

24.0 

30.9 

32.0 

41.3 

0.2 

0.3 

8.2 

10.6 

16.2 

20.9 

24.2 

31.2 

32.2 

41.5 

0.4 

0.5 

8.4 

10.8 

16.4 

21.1 

24.4 

31.5 

32.4 

41.8 

0.6 

0.8 

8.6 

11.1 

16.6 

21.4 

24.6 

31.7 

32.6 

42.0 

0.8 

1.0 

8.8 

11.3 

16.8 

21.7 

24.8 

32.0 

32.8 

42.3 

1.0 

1.3 

9.0 

11.6 

17.0 

21.9 

25.0 

32.2 

33.0 

42.5 

1.2 

1.5 

9.2 

11.9 

17.2 

22.2 

'25.2 

32.5 

33.2 

42.8 

1.4 

1.8 

9.4 

12.1 

17.4 

22.4 

25.4 

32.7 

33.4 

43.1 

1.6 

2.1 

9.6 

12.4 

17.6 

22.7 

25.6 

33.0 

33.6 

43.3 

1.8 

2.3 

9.8 

12.6 

17i8 

22.9 

25.8 

33.3 

33.8 

43.6 

2.0 

2.6 

10.0 

12.9 

18.0 

23.2 

26.0 

33.5 

34.0 

43.8 

2.2 

2.8 

10.2 

13.1 

18.2 

23.5 

26.2 

33.8 

34.2 

44.1 

2.4 

3.1 

10.4 

13.4 

18.4 

23.7 

26.4 

34.0 

34.4 

44.3 

2.6 

3.4 

10.6 

13.7 

18.6 

24.0 

26.6 

34.3 

34.6 

44.6 

2.8 

3.6 

10.8 

13.9 

18.8 

24.2 

26.8 

34.6 

34.8 

44.9 

3.0 

3.9 

11.0 

14.2 

19.0 

24.5 

27.0 

34.8 

35.0 

45.1 

3.2 

4.1 

11.2 

14.5 

19.2 

24.8 

27.2 

35.1 

35.2 

45.4 

3.4 

4-4 

11.4 

14.7 

19.4 

25.0 

27.4 

35.3 

35.4 

45.6 

3.6 

4.6 

11.6 

15.0 

19.6 

25.3 

27.6 

35.6 

35.6 

45.9 

3.8 

4.9 

11.8 

15.2 

19.8 

25.5 

27.8 

35.8 

35.8 

46.2 

4.0 

5.2 

12.0 

15.5 

20.0 

25.8 

28.0 

36.1 

36.0 

46.4 

4.2 

5.4 

12.2 

15.8 

20.2 

26.0 

28.2 

36.4 

36.2 

46.7 

4.4 

5.7 

12.4 

16.0 

20.4 

26.3 

28.4 

36.6 

36.4 

46.9 

4.6 

5.9 

12.6 

16.3 

20.6 

26.6 

28.6 

36.9 

36.6 

47.2 

4.8 

6.2 

12.8 

16.5    ' 

20.8 

26.8 

28.8 

37.1 

36.8 

47.4 

5.0 

6.4 

13.0 

16.8 

21.0 

27.1 

29.0 

37.4 

37.0 

47.7 

5.2 

6.7 

13.2 

17.0 

21.2 

27.3 

29.2 

37.6 

37.2 

48.0 

5.4 

7.0 

13.4 

17.3 

21.4 

27.6 

29.4 

37.9 

37.4 

48.2 

5.6 

7.2 

13.6 

17.5 

21.6 

27.8 

29.6 

38-2 

37.6 

48.5 

5.8 

7.5 

13.8 

17.8 

21.8 

28.1 

29.8 

38.4 

37.8 

48.7 

6.0 

7.7 

14.0 

18.0 

22.0 

28.4 

30.0 

38.7 

38.0 

49.0 

6.2 

8.0 

14.2 

18.3 

22.2 

28.6 

30.2 

38.9 

38.2 

49.2 

6.4 

8.3 

14.4 

18.5 

22.4 

28.9 

30.4 

39.2 

38.4 

49.5 

6.6 

8.5 

14.6 

18.8 

22.6 

29.1 

30.6 

39.5 

38.6 

49.8 

6.8 

8.8 

14.8 

19.0 

22.8 

29.4 

30.8 

39.7 

38.8 

50.0 

7-0 

9.0 

15.0 

19.3 

23.0 

29.7 

31.0 

40.0 

39.0 

50.3 

7.2 

9.3 

15.2 

19.6 

23.2 

29.9 

31.2 

40.2 

39.2 

50.5 

7.4 

9.5 

15.4 

19.8 

23.4 

30.2 

31.4 

40.5 

39.4 

50.8 

7.6 

9.8 

15.6 

20.1 

23.6 

30.4 

31.6 

40.7 

39.6 

51.1 

7.8 

10.1 

15.8 

20.3 

23.8 

30.7 

31.8 

41.0 

39.8 

51.3 

;       8.0 

10.3 

16.0 

20.6 

24.0 

30.9 

32.0 

41.3 

40.0 

51.6 

This  Table  supposes  the  scale  to  be  of  brass  from  the  top  to  the  cistern.  If  it 
were  of  glass  or  of  wood,  the  argument  T'  —  T  ought  to  be  diminished  at  the  ratio 
of  54  to  62. 

In  calculating  the  formula  of  Laplace,  we  begin  by  reducing  the  barometers  to 

/T' T\ 

the  same  temperature  by  means  of  the  following  formula  :  H  =  h'  -f-  h'  I  I. 

Table  II.  saves  this  trouble,  and  gives,  in  metres,  the  correction  due  to  the  differ- 
ence of  temperature  of  the  barometers. 
D  30 


BAROMETRICAL    MEASUREMENT    OF    HKKillTS    DELCROS. 


TABLE  III.     CORRECTION  FOR  DECREASE  OF  GRAYITATION  IN  LATITUDE. 
ft  =  (0.0028371  cosin.  2  L).     (A  -f  a  +  0). 

The  Argument  is  the  Mean  Latitude  between  the  two  Stations. 


LATITUDE. 

Correction,  in  metres,  for 

Correction. 

Added.  (Subtr'ct 

1000 

2000 

3000 

4000 

5000 

6000 

7000 

8000 

9000 

„ 

o 

o 

90 

2.8 

5.7 

8.5 

11.3 

14.2 

17.0 

19.9 

22.7 

25.7 

1 

89 

2.8 

5.7 

8.5 

11.3 

14.2 

17.0 

19.8 

22.7 

25.6 

2 

88 

2.8 

5.7 

8.5 

11.3 

14.1 

17.0 

19.8 

22.6 

*25.5 

3 

87 

2.8 

5.6 

8.5 

11.3 

14.1 

16.9 

19.7 

22.6 

25.4 

4 

86 

2.8 

5.6 

8.4 

11.2 

14.0 

16.9 

19.7 

22.5 

25.3 

5 

85 

2.8 

5.6 

8.4 

11.2 

14.0 

16.8 

19.6 

22.3 

25.1 

6 

84 

2.8 

5.5 

8.3 

11.1 

13.9 

16.6 

19.4 

22.2 

25.0 

7 

83 

2.7 

5.5 

8.2 

11.0 

13.8 

16.5 

19.3 

22.0 

24.8 

8 

82 

2.7 

5.4 

8.2 

10.9 

13.6 

16.4 

19.1 

21.8 

24.5 

9 

81 

2.7 

5.4 

8.1 

10.8 

13.5 

16.2 

18.9 

21.6 

24.3 

10 

80 

2.7 

5.3 

8.0 

10.7 

13.3 

16.0 

18.7 

21.3 

24.0 

11 

79 

2.6 

.5.2 

7.9 

10.5 

13.1 

15.8 

18.4 

21.0 

23.7 

12 

78 

2.6 

5.2 

7.8 

10.4 

13.0 

15.5 

18.1 

20.7 

23,3 

13 

77 

2.5 

5.1 

7.6 

10.2 

12.7 

15.3 

17.8 

20.4 

22.9 

14 

76 

2.5 

5.0 

7.5 

10.0 

12.5 

15.0 

17.5 

20.0 

22.5 

15 

75 

2.5 

4.9 

7.4 

9.8 

12.3 

14.7 

17.2 

19.7 

22.1 

16 

74 

2.4 

4.8 

7.2 

9.6 

12.0 

14.4 

16.8 

19.2 

21.6 

17 

73 

2.4 

4.7 

7.0 

9.4 

11.8 

14.1 

16.5 

18.8 

21.2 

18 

72 

2.3 

4.6 

6.9 

9.2 

11.5 

13.8 

16.1 

18.4 

20.7 

19 

71 

2.2 

4.5 

6.7 

8.9 

11.2 

13.4 

15.6 

17.9 

20.1 

20 

70 

2.2 

4.3 

6.5 

8.7 

10,9 

13.0 

15.2 

17-4 

19.6 

21 

69 

2.1 

4.2 

6.3 

8.4 

10.5 

12.6 

14.7 

16.9 

19.0 

22 

68 

2.0 

4.1 

6.1 

8.2 

10.2 

12.2 

14.3 

16.3 

18.4 

23 

67 

2.0 

3.9 

5.9 

7.9 

9.8 

11.8 

13.8 

15.8 

17.7 

24 

66 

1.9 

3.8 

5.7 

7.6 

9.5 

11.4 

13.3 

15.2 

17-1 

25 

65 

1.8 

3.6 

5.5 

7.3 

9.1 

10.9 

12.8 

14.6 

16.4 

26 

64 

1.7 

3.5 

5.2 

7.0 

8.7 

10.5 

12.2 

14.0 

15.7 

27 

63 

1.7 

3.3 

5.0 

6.7 

8.3 

10.0 

11.7 

13.3 

15.0 

28 

62 

1.6 

3.2 

4-8 

6.3 

7.9 

9.5 

11.1 

12.7 

14.3 

29 

61 

1.5 

3.0 

4.5 

6.0 

7.5 

9.0 

10.5 

12.0 

13.5 

30 

60 

1.4 

2.8 

4.3 

5.7 

7.1 

8.5 

9.9 

11.3 

12.8 

31 

59 

1««J 

2.7 

4.0 

5.3 

6.6 

8.0 

9.3 

10.6 

12.0 

32 

58 

1.2 

2.5 

3.7 

5.0 

6.2 

7.5 

8.7 

9.9 

11.2 

33 

57 

1.1 

2.3 

3.5 

4.6 

5.8 

6.9 

8.1 

9.2 

10.4 

34 

56 

1.1 

2.1 

3.2 

4.2 

5.3 

6.4 

7.4 

8.5 

9.6 

35 

55 

1.0 

.9 

2.9 

3.9 

4.8 

5.8 

6.8 

7.8 

8.7 

36 

54 

0.9 

.7 

2.6 

3.5 

4.4 

5.3 

6.1 

7.0 

7.9 

37 

53 

0.8 

.6 

2.3 

3.1 

3.9 

4.7 

5.5 

6.2 

7.0 

38 

52 

0.7 

.4 

2.1 

2.7 

3.4 

4.1 

4.8 

5.5 

6.2 

39 

51 

0.6 

.2 

1.8 

2.4 

2.9 

3.5 

4.1 

4.7 

5.3 

40 

50 

0.5 

.0 

1.5 

2.0 

2.5 

3.0 

3.4 

3.9 

4.4 

41 

49 

0.4 

0-8 

1.2 

1.6 

2.0 

2.4 

2.8 

3.2 

3.5 

42 

48 

0.3 

0.6 

0.9 

1.2 

1.5 

1.8 

2.1 

2.4 

2.7 

43 

47 

0.2 

0.4 

0.6 

0.8 

1.0 

1.2 

1.4 

1.6 

1.8 

44 

46 

0.1 

0.2 

0.3 

0.4 

0.5 

0.6 

0.7 

0.8 

0.9 

45 

45 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

D 


31 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. DELCROS. 

TABLE  IV.     CORRECTION  FOR  DECREASE  OF  GRAVITATION  ON  A  VERTICAL  LINE. 


Argument  = 


Approximate 
Difference 

Correspond. 
Correction 

Approximate 
Difference 

Correspond. 
Correction 

Approximate 
Difference 

Correspond. 
Correction 

Approximate 
Difference 

Correspond. 
Correction 

of  Level. 

Positive. 

of  Level. 

Positive. 

of  Level. 

Positive. 

of  Level. 

Positive. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

100 

0.2 

2100 

6.0 

4100 

12.9 

6100 

21.1 

200 

0.5 

2200 

6.3 

4200 

13.3 

6200 

21.6 

300 

0.8 

2300 

6.6 

4300 

13 

.7 

6300 

22.0 

400 

1.0 

2400 

6.9 

4400 

14 

.1 

6400 

22.5 

500 

1.3 

2500 

7.3 

4500 

14.5 

6500 

22.9 

600 

1.6 

2600 

7.6 

4600 

14 

.9 

6600 

23.4 

700 

1.8 

2700 

7.9 

4700 

15.3 

6700 

23.9 

800 

2.1 

2800 

8.3 

4800 

15.7 

6800 

24.3 

900 

2.4 

2900 

8.6 

4900 

16 

.1 

6900 

24.8 

1000 

2.7 

3000 

8.9 

5000 

16.5 

7000 

25.3 

1100 

2.9 

3100 

9.3 

5100 

16 

.9 

7100 

25.7 

1200 

3.2 

3200 

9.6 

5200 

17.3 

7200 

26.2 

1300 

3.5 

3300 

10.0 

5300 

17 

.7 

7300 

26.7 

1400 

3.8 

3400 

10.3 

5400 

18 

.1 

7400 

27.2 

1500 

4.1 

3500 

10.7 

5500 

18 

.5 

7500 

27.7 

1600 

4.4 

3600 

11.1 

5600 

19.0 

7600 

28.1 

1700 

4.7 

3700 

11.4 

5700 

19 

.4 

7700 

28.6 

1800 

5.0 

3800 

11.8 

5800 

19.8 

7800 

29.1 

1900 

5.3 

3900 

12.2 

5900 

20.3 

7900 

29.6 

2000 

5.6 

4000 

12.5 

6000 

20.7 

8000 

30.1 

TABLE   V.    COREECTION  FOB  THE   ELEVATION  OF   THE      LOWER      STATION  ABOVE    OCEAN. 

Argument  =  Height  of  Barometer  at  Lower  Station. 

Height  of  Barometer  at  Lower  Station  in  Millimetres. 

Approximate 
Difference 

of  Level. 

400 

450 

500 

550 

600 

650          700 

750 

Metres. 
1000 

Metres. 
1.7 

Metres. 
1.4 

Metres. 
1.1 

Metres. 
0.9 

Metres. 
0.6 

Metres.        Metres. 
0.4            0.2 

Metres. 
0.0 

2000 

3.4 

2.8 

2.2 

1.7 

1.3 

0.8            0.4 

0.1 

3000 

5.1 

4.2 

3.3 

2.6 

1.9 

1.3            0.7 

0.1 

4000 

6.8 

5.6 

4.4 

3.4 

2.5 

1.7            0.9 

0.1 

5000 

8.5 

6.9 

5.5 

4.3 

3.1 

2.1             1.1 

0.1 

6000 

10.3 

8-3 

6.7 

5.2 

3.8 

2.5            1.3 

0.2 

7000 

12.0 

9.7 

7.8 

6.0 

4.4 

2.9            1.5 

0.2 

8000 

13.7 

11.1 

8.9 

6.9 

5.0 

3.4            1.8 

0.2 

9000 

15.4 

12.5 

10.0 

7.7 

5.7 

3.8            2.0 

0.3 

D 


II. 

TABLES 

FOR    CO3IPUTJNG    DIFFERENCES    OF    ELEVATION    FROM    BAROMETRICAL    OBSERVATIONS. 

BY    A.    GUYOT. 

TABLES  which,  like  the  preceding  ones  by  Delcros,  in  metrical  measures,  are 
sufficiently  extensive  to  save  the  necessity  of  interpolations,  relieve  the  computer  of 
most  of  his  trouble,  and.  considerably  reduce  the  chances  of  error  in  the  computa- 
lions.  They  thus  render  to  science  itself  a  real  service,  by  inducing  observers  to 
determine  a  larger  number  of  poirrts,  and  to  secure  the  accuracy  of  the  results  by 
repeating  their  observations  at  the  same  point  in  various  atmospheric  circumstances, 
both  of  which  they  can  do  without  fear  of  being  overwhelmed  by  the  labor  of 
the  computation. 

Similar  tables  are  here  offered  to  the  observers  who  use  instruments  graduated  to 
English  measures.  Like  those  of  Delcros,  the  new  tables  are  based  on  Laplace's 
formula,  with  a  slight  modification  of  only  one  constant.  They  dispense  with  the 
use  of  logarithms,  and  give  the  differences  of  level  corresponding  to  every  thou- 
sandth of  an  inch  from  12  to  31  inches  by  means  of  the  simplest  arithmetical  opera- 
tions, so  that  the  data  being  prepared  and  corrected,  the  computation  of  an  elevation 
takes  but  a  few  minutes,  and  is  done  with  scarcely  any  cbance  of  error. 

Laplace's  formula  and  constants  were  adopted  for  the  computation  of  the  tables  in 
preference  to  others  found  in  the  following  sets  for  reasons  which  a  few  words  will 
explain. 

It  has  been  remarked,  page  9,  that,  in  consequence  of  Laplace's  constants  having 
been  retained  in  Gauss's,  Schmidt's,  and  Daily's  formula?,  they  all  give  similar  re- 
sults ;  but  that  Bessel's  formula  differs  in  separating  the  correction  due  to  the  moist- 
ure of  the  air  from  that  due  to  its  temperature,  while  in  Laplace's,  and  in  the  for- 
mulae just  mentioned,  both  are  united.  To  introduce  a  separate  correction  for  the 
expansion  of  aqueous  vapor  is,  in  the  writer's  view,  a  doubtful  improvement.  The 
laws  of  the  distribution  and  transmission  of  moisture  through  the  atmosphere  are  too 
little  known,  and  its  amount,  especially  in  mountain  regions,  is  too  variable,  and 
depends  too  much  upon  local  winds  and  local  condensation,  to  allow  a  reasonable 
hope  of  obtaining  the  mean  humidity  of  the  layer  of  air  between  the  two  stations 
by  means  of  hygrometrical  observations  taken  at  each  of  them.  These  doubts  are 
confirmed  by  the  experience  of  the  author  and  of  many  other  observers,  which  shows 
that,  on  an  average,  Laplace's  method  works  not  only  as  well  as  the  other,  but 
more  uniformly  well.  At  any  rate,  the  gain,  if  there  is  any,  is  not  clear  enough  to 
compensate  for  the  undesirable  complication  of  the  formula. 

Though  the  several  co-efficients  of  Laplace's  formula  need  perhaps  to  be  modified 
according  to  more  recent  and  probably  more  accurate  determinations  of  the  physical 
constants  on  which  they  depend,  as  has  been  proposed  by  Plantamour,  E.  Hitter,  and 
lately  by  the  writer  himself  in  a  paper  read  before  the  American  Association  for  the 
Advancement  of  Science  at  their  meeting  in  Montreal,  they  have  been  retained  in 
preparing  the  following  tables,  partly  because  it  was  found  that  the  errors  due  to 

D  33 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

the  various  co-efficients  nearly  compensate  each  other  ;  partly  on  the  ground  that, 
until  a  severe  test,  by  means  of  actual  comparative  measurements  made  for  the 
purpose,  has  shown  the  expediency  of  these  modifications,  it  seemed  desirable  to 
adhere  to  the  old  constants,  and  thus  to  preserve  a  uniformity  in  the  results  with  the 
tables  of  Oltmans,  Delcros,  Gauss,  Baily,  and  others,  which  have  already  been 
extensively  used.  The  substitution  of  the  co-efficient  0.00260,  expressing,  accord- 
ing to  Schmidt's  computation  (Mathem.  mid  Physic.  Geogr.,  II.  p.  202),  the  variation 
of  gravity  in  latitude,  for  the  value  0.002837,  does  not  sensibly  alter  the  altitudes 
obtained. 

The  close  agreement  of  the  determinations  furnished  by  Laplace's  formula,  in 
barometrical  measurements  carefully  conducted,  made  in  favorable  circumstances, 
and  during  the  warm  season,  with  those  obtaified  from  repeated  trigonometrical 
observations,  or  by  the  spirit-level,  strongly  testifies  in  favor  of  its  general  correct- 
ness. A  few  striking  examples  will  suffice  to  show  it. 

The  altitude  of  Mont  Blanc,  measured  by  the  barometer,  by  MM.  Bravais  and 
Martins,  on  the  29th  of  August,  1844,  and  computed  by  Delcros,  by  means  of  nine 
corresponding  stations  situated  on  all  sides  of  the  mountain  (see  Annuairc  Mcteoro- 
logique  de  France,  for  1851,  p.  274),  was  found  to  be  4810  metres.  The  altitude  of 
the  same  point,  being  the  mean  of  seven  of  the  most  elaborate  and  reliable  geodetic 
measurements,  which  cost  nearly  twenty  years  of  labor,  is  4809.6  metres. 

For  smaller  elevations  the  formula  seems  to  answer  equally  well. 

The  barometrical  measurement  of  Mount  Washington,  in  New  Hampshire,  by  the 
author,  on  the  8th  and  9th  of  August,  1851,  gave,  by  Delcros's  Tables,  for  the  mean 
of  eight  observations,  taken  at  different  hours  of  the  day,  5466.7  English  feet  above 
Gorham,  N.  H.,  6285.7  above  high  tide,  and  6291.7  feet  above  the  mean  level  of  the 
•ocean  in  Portland  harbor.  In  August,  1852,  W.  A.  Goodwin,  Civil  Engineer,  start- 
ing from  Gorham  Railroad  Station,  found,  by  the  spirit-level,  Mount  Washington  to 
be  6285.5  feet  above  mean  tide.  In  September,  1853,  Captain  T.  J.  Cram,  of  the 
Topographical  Engineers,  executed,  in  behalf  of  the  Coast  Survey,  a  careful  measure- 
ment with  the  spirit-level,  on  the  same  line,  for  the  purpose  of  testing  the  various 
methods  of  measuring  altitudes,  and  found  Mount  Washington  to  be  6293  English 
feet  above  the  mean  level  of  the  ocean. 

In  lower  latitudes  the  formula  showed  equally  good  results.  By  a  barometrical 
measurement  In  July,  1856,  the  altitude  of  the  highest  peak  of  the 'Black  Mountain, 
North  Carolina,  about  Lat.  36°,  was  found  by  the  author  to  be  6701  English  feet; 
and  that  of  the  highest  Mountain  House  5248  feet.  In- September,  1857,  Major 
T.  C.  Turner,  Chief  Engineer  of  the  Morganton  Railroad,  ran  a  line  of  levels  from 
the  same  point  which  was  used  as  the  lower  station  for  the  barometrical  measurement, 
to  the  top  of  the  highest  peak,  and  found  its  altitude  to  be  6711  English  feet,  and 
that  of  the  Mountain  House  5246  feet.  Other  points  on  the  line  agreed  equally  well. 

Such  an  agreement,  in  so  considerable  elevations,  is  all  that  can  be  desired. 

These  figures  show  conclusively,  that,  when  the  errors  which  may  arise  from  the 
great  variability  of  the  data  furnished  by  the  instruments  have  been  removed  by  a 
repetition,  in  various  states  of  the  atmosphere,  and  by  a  proper  combination  of  simul- 
taneous observations  at  stations  not  too  distant  from  each  other,  those  which  remain 
and  may  be  attributed  to  the  formula  cannot  be  considerable.  But,  on  the  other 

D  34 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 


hand,  we  have  no  right  to  expect  such  results  from  single  observations,  taken,  per- 
haps, in  unsettled  weather,  without  paying  any  regard  to  the  time  of  the  day  at 
which  they  were  made,  to  the  distance  or  the  non-simultaneity  of  the  corresponding 
observations,  or  to  other  unfavorable  circumstances.  It  is  too  well  known  that  in 
such  cases  large  errors  may  and  do  actually  occur  ;  but  for  these  the  formula  ought 
not  to  be  held  responsible. 

ARRANGEMENT  OF  THE  TABLES. 
If  we  call 

h  =.  the  observed  height  of  the  barometer  \ 

T   =  the  temperature  of  the  barometer        >  at  the  lower  station  ; 

t    —  the  temperature  of  the  air  ) 

h'  =  the  observed  height  of  the  barometer  } 

T'  =  the  temperature  of  the  barometer        >  at  the  upper  station. 

t1  —  the  temperature  of  the  air  ) 

If  we  make,  further, 

Z  =  the  difference  of  level  between  the  two  barometers  ; 

L  =  the  mean  latitude  between  the  two  stations  ; 

H—  the  height  of  the  barometer  at  the  upper  station  reduced  to  the  tem- 
perature of  the  barometer  at  the  lower  station  ;  or, 

H=  li>  \  1  -f  0.00008967  (r  —  r')J; 

The  expansion  of  the  mercurial  column,  measured  by  a  brass  scale,  for 
1°  Fahrenheit  =  0.00008967  ; 

The  increase  of  gravity  from  the  equator  to  the  poles  =  0.00520048,  or 
0.00260  to  the  45th  degree  of  latitude  ; 

The  earth's  mean  radius  =  20,886,860  English  feet; 
Then,  Laplace's  formula,  reduced  to  English  measures,  reads  as  follows  : 


Z  ==  log  -=j  X  60158.6  English  feet  H 


900 
(  i_|_  0.00260  cos  2  L). 


* 

V    "•"  2 


*+_52252  _h  __ 

20886860          10443430 


Table  I.  gives,  in  English  feet,  the  value  of  log  H  or  h  X  60158.6  for  every 
hundredth  of  an  inch,  from  12  to  31  inches  in  the  barometer,  together  with  the  value 
of  the  additional  thousandths,  in  a  separate  column.  These  values  have  been  dimin- 
ished by  a  constant,  which  does  not  alter  the  difference  required. 

Table  II.  gives  the  correction  2.343  feet  X  (T  —  T')  for  the  difference  of  the  tem- 
peratures of  the  barometers  at  the  two  stations,  or  T  —  r7.  As  the  temperature  at 
the  upper  station  is  generally  lower,  T  —  T'  is  usually  positive,  and  the  correction 
negative.  It  becomes  positive  when  the  temperature  of  the  upper  barometer  is  higher, 
and  T  —  T'  negative.  When  the  heights  of  the  barometers  have  been  reduced  to  the 
same  temperature,  or  to  the  freezing  point,  this  table  will  not  be  used. 

z    I    52252 
Table  IV.  shows  the  correction  D'  -  -  to  be  applied  to  the   approximate 


altitude  for  the  decrease  of   gravity  on    a  vertical  acting  on    the    density    of  the 
mercurial  column.     It  is  always  additive. 
D  35 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

Table  V.  furnishes  the  small  correction  — -  — -  for  the  decrease  of  gravity  on 

a  vertical  acting  on  the  density  of  the  air ;  the  height  of  the  barometer  li  at  the 
lower  station  representing  its  approximate  altitude.  Like  the  preceding  correction,  it 
is  always  additive. 

USE  OF  THE  TABLES. 

In  Table  I.  find  first  the  numbers  corresponding  to  the  observed  heights  of  the 
barometer  h  and  h'.  Suppose,  for  instance,  h  =  29.345  in.;  find  in  the  first  column  on 
the  left  the  number  29.3;  on  the  same  horizontal  line,  in  the  column  headed  .04,  is 
given  the  number  corresponding  to  29.34  =  28121.7  ;  in  the  last  column  but  one  on 
the  right,  we  find  for  .005  =  4.5,  or  for  29.345  —  28126.2.  Take  likewise  the 
value  of  7t',  and  find  the  difference. 

If  the  barometrical  heights  have  not  been  previously  reduced  to  the  same  tem- 
perature, or  to  the  freezing  point,  apply  to  the  difference  the  correction  found  in 
Table  II.  opposite  the  number  representing  T  —  T'  ;  we  thus  obtain  the  approximate 
difference  of  level,  D. 

For  computing  the  correction  due  to  the  expansion  of  the  air  according  to  its 

(I  i   ji (j4\ 
— J,  make  the  sum  of  the  temperatures,  subtract  from 

that  sum  64  ;  multiply  the  rest  into  the  approximate  difference  D,  and  divide  the 
product  by  900.  This  correction  is  of  the  same  sign  as  (t  -\-  t'  —  64).  By  apply- 
ing it,  we  obtain  a  second  approximate  difference  of  level,  D'. 

In  Table  III.,  with  D1  and  the  mean  latitude  of  the  stations,  find  the  correction  for 
variation  of  gravity  in  latitude,  and  add  it  to  7}',  paying  due  attention  to  the  sign. 

In  Table  IV.  with  D',  and  in  Table  V.  with  D'  and  the  height  of  the  barometer  at 
the  lower  station,  take  the  corrections  for  the  decrease  of  gravity  on  a  vertical,  and 
add  them  to  the  approximate  difference  of  level. 

The  sum  thus  found  is  the  true  difference  of  level  between  the  two  stations,  or  Z; 
by  adding  the  elevation  of  the  lower  station  above  the  level  of  the  sea,  when  known, 
we  obtain  the  altitude  of  the  upper  station. 

The  use  of  the  small  table,  VI.,  by  means  of  which  approximate  differences  of 
level  can  be  obtained  by  a  single  multiplication,  is  explained  below,  page  90. 

Example  1. 

Measurement  of  Mount  Washington,  New  Hampshire,  by  A.  Guyot,  August  8th 
1851,  4  P.M.  ;  the  barometer  at  the  lower  station  being  at  825  English  feet  above 
the  mean  level  of  the  sea ;  at  the  upper  station  at  one  foot  below  the  summit. 

The  observation  gave, 

Barometer.  Attached  Thermometer.  Temperature  of  Air. 

Gorham,  h  =  29.272  in.       r  =  70°.70  F.         t  =  72°.05  F. 

Mount  Washington,       h1  ==  24.030  "         T'  =  54°.52  F.         t'  =  50°.54  F. 

T  —  T'  =   16°.38  F.  122°.59  F. 

—  64° 


)i 


t  _|_  t'  —  64  =  58°.59  F. 
D  36 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

Table  I.  gives  for  h  =  29.272  inches,      .         .         .  28,061.00 

"         «       for  h'  =  24.030     "...  22,905.60 

Difference,         .         .  5,155.40 

Table  II.  gives  for  r  —  r'  =   16°.38     .  -  37.64 

Approximate  difference  of  level,  D  =  5,117.76 
D  X  (t  -h  V  —  64)   _      5118  X  58.6 
900                                 900 

Second  approximate  difference,  D'  =  5,450.95 

Table  III.  gives  for  D1  =  5450  and  Lat.  44°  .  .  0.50 

Table  IV.  gives  for  D1  =  5450  ....  14.94 

Table  V.  gives  for  h  =  29.27  ....  0.00 

Barometer  below  summit,     .         .  —  1.00 

Mount  Washington  above  Gorham,  or       .  Z  =     5,465.39 

Barometer  at  Gorham  above  sea  level            .  825.00 


Mount  Washington  above  the  sea,  or  altitude,  .         .        6,290.39  Eng.  ft. 

Example  2. 

Measurement  of  the  highest  peak  of  the  Black  Mountain,  in  North  Carolina,  July 
llth,  1856,  by  A.  Guyot. 

By  observation  we  have  at, 

Barometer.  Attached  Thermometer.  Temperature  of  Air. 

Mountain  House,       h  =  24.934  in.        r  =  64°.58  F.         t  =  61°.34  F. 
Highest  Peak,  A'  =  23.662  "         r1  =  61°.88  F.         t1  =  59°.36  F. 

T  —  r'  =     2°.70  F.  120°.70  F. 

—  64° 


t  +  t'  —  64  =  56°.7  F. 

Table  I.  gives  for  h  =  24.934  .         .         .         .         .     23,870.4 
"      for  /*'  =  23.662        ....        22,502.4 

Difference,    ....       1,368.0 
Table  II.  gives  for  T  —  T'  =  2.7    .  .  -  6.3 

Approximate  difference,  D  =     1,361.7 
D  X  (t-±-f  —  64)   _      1362  X  56.7 

900  900  S5'y 

Second  approximate  difference,  D'  =  1,447.5 

Table  III.  gives  for  D'  =  1448  and  Lat.  36°       .  1.2 

Table  IV.  gives  for  D1  =  1448       ....  3.8 

Table  V.  gives  for  D'  =  1448  and  h  =  25        .         .  0.7 

Highest  peak  above  Mountain  House,  or  .    Z  =     1,453.2 

Mountain  House  above  the  sea         ....  5,248.4 

Black  Mountain,  highest  peak  above  the  sea,  or  altitude,     6,701.6  Eng.  ft. 
D  37 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. GUYOT. 


M 

« 

O 

H 

< 

> 

PC 

M 

£ 

0 

i-3 

•4 

0 

0 

.2 

S 

S 

u 

cc 

w 

i 

Jj 

0 

** 

PC 

O 

<j 

Is 

PQ 

i 

S 

i 

0 

Q 

a 

PQ 

w 

| 

M 

9 

0 

<J 

"S 

^ 

PH 

1 

m 

O 

3 

H 

p 

1 

>J 

BN 

J 

PQ 

O 
H 

o 

1 

EH 

H 

§ 

*r 

H 
M 

I 

M 

H 

•si 

g 

S 

H 
0 

S 

^ 

H 

X 

PC 

S 

H 

oo 

3 

0 

i 

o   i-(  co   co   -t* 

«    «O     t-    CO    C5 

o   I-H   co   co   -t 

co   eo   co   co   co 

CO     CO    CO     CO     CO 

CO    CO     CO     CO     CO 

1 

1 

1 

^       I-H    CO 

co   eo   t   m   co 

CO     t* 

jj 

a  ^ 

|     ci   ^ 

co  co  o   eo   -r 

CO     CO 

H  a 

rH    CO 

eo   •<*   m  co   i> 

CO    Ci 

"S  co  co  co  o  o 

t  o  co   »^  m 

Ci    CO    I-H    0    -f 

C* 

fe    CO     CO     fr»     Ci     Ci 

•  m   i>  co   ci  o 

M  Ci     rH     CO     m     CO 

l>-     -T     35     CO     "t 

i—  i     CO    CO     CO     CO 

O    co    -r    co    co 

-r   eo   1-1   r^   1-1 

§CO     CO     CO     CO 
co    -r   cc   co 

|  0    **    0    C5    _i 

co  m  co   i1   -f 

Ci    o    -f    -f    0 

P*<    I"*    (M     l^*    CC     QO 

CO     CO    CO    CO     -f 

Tt4       CO       ^H       t*"      C~l 

^ 

to  a-!   ^   eo   m   i^ 
jO  n*   m   m  o   10 

O5     <M     -T     CO     CO 

in  co  co   co   co 

O    CO    -r    co    CO 
i>    i^.    t>.    i--    i- 

1u    -f     Ci     **•     CO     (M 

CO     CO     CO     r-l    CO 

O     I-H    CO    C5     <O 

0 

PH  m    O    -t    co    t" 

.  -H   eo    -r    10   co 
w>  ci   I-H   co   m   t>- 

in  co   co  co   -f 

t^     CO     CO     C5     C5 
Ci     ^"^     CO     >O     £•• 

m   co   co   co   co 

in   -t   I-H   f-  co 

05     Ci     C5     CO     CO 
Ci     —     CO     »O     »•• 

1  *:  "t  "*  *:  ^ 

O    CO    CO    CO    rH 

O    CO    »-(    "t    CO 

S 

Pn  co    Ci    eo    m    co 

•    Ci     O     CO     CO     "T4 

60  co   i—  i   eo   m   t- 
o  TP   10  m   m   in 

in   co   t^   ^H   -t 
in  co   co   t-»   t^ 

in   S   co   co    co 

m   -f  <M  co   co 

t^     t^     «^     CO     0 

. 

"S  PH  o  .-I  in  eo 

co   co   eo  m  o 

o   -f   co  co  co 

a 

M 
S 

O 

o 

**  co  o   co   m   f» 
a  rr   m   m   in   m 

eo   TJ«   i<   10   m 
03   —   co   m   t^ 
m   co  co  co   co 

m  rf  co   co   co 
m   m   »n   ~r   -n 
cs   I-H   co   »n   t* 

CO     1>     O     £»     l^ 

1 

~  -,   ^   ^  „,  M 

"^    Ci    CO     I-H    CO 

C5  m  co  co   •**< 

1 

a 

* 

PM  o    co    O    CO    -r 
m 

CO    O    CO    ~H    CO 
i-i     CO     CO     CO     70 

cji   f«   co   m   t^ 

m  co  co  co  co 

-T   -*   e«i   Ci    -t 

CO     CO     CO    CO    CO 
Ci     —     CO     10     t>- 
CO     J>     1>     J>     »> 

"£    t^    Ci     -f    CO    CO 

co  eo  eo  co   co 

Ci    CO    Ci    CO    O 

w 

P=<  oo   -r  ci   co   co 

eo  o   co  o   co 

t   -T   eo  o   -r< 

o 

g>  CO    0     CO     S?    CO 

^  Tf   10   m   m   m 

m   co   o   co   co 

Ci   "—  i   co   m   t>» 

CO     J>     t"     1--     l> 

|  «    rf    0    0    CO 

t^  co  co   -f   -f 

co   »>  I-H  o   -f 

« 

N  co   co   co   co   co 

tJ3  CO    O     CO     '-r     CO 

fl  ^i1   in   in   in   m 
H 

t-i   «i   m  o   co 

t^*     l^    CO     O    C5 

go  eo    -T   co 
CO     CO     CO     CO 

-r    —   co   o   o 

Ci     CTi     Ci     Ci     CO 
CO    O     CO     -f     CO 
CO    t>    l>    1>    l> 

"S   CO     CO     CO    CO    CO 

CO    CO    CO    O    CO 

i>  co   co   -f  o 

0 

&J  ,n   ^   co  ei   -H 

.   CO    O    i-«    CO     ^f 
to  «^    O    CO     -r    CO 

a  Tf   10   m  in   m 

o   co   m  o   co 
m  m   co   i-   «^ 

£O     CO     of     CO 
CO    CO    CO    CO 

-r   •«*   eo  o   co 

1>     t»     t*     t^-     CO 

co    O    01    -r    co 

•g'  -t  <M  co  m  1-1 

0    I-H    CO    CO    Ci 

»  Ci   co  co   m 

o 

(2J  co  o   in  oo  CD 

to  t^   C5    >-i    -r   cb 

a  TJ.   rf   m   in  m 

<3i    CO    -^    O    CO 
CO     CO     -*•     -T     "O 

co  o   eo   -t  co 
in  co   co  co  co 

•f     •*     CO     0     CO 

j^   ,/^    1^   i^\   -^ 
on   o   co   -f   co 
co   i-   r-   i>   t- 

1 

1 

o   i--  eo   co   -t 

m   co   t^  co  o 

O     1-1    CI     CO     -f 

| 

SM 

co   eo  co   co  co 

co  eo   eo   co   co 

co  eo   co   to   so 

i 

I 

38 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. GUYOT. 


1 

J 

IO    CO    b- 

00    O5 

0  PH 

CM     CO     ^ 

10    -CO 

b*»    GO    O5 

O     PH     CM 

CO    -f 

10     CO 

b-    CO     O5 

1 

to 

i 

I 

*5        05 

oo  co 

IO  •*}< 

CO    CM    O 

0 

b-    -* 

pH    CO    »0 

(M     05 

CO    CO 

p 

!l 

I    - 

CO    »O 

b-  O5 

PH     CO     IO 

£ 

PH     CO 

IO    CO    CO 

O      PH 

CO     IO 

1 

- 

CM    CO 

"#  10 

CO     if    CO 

O5 

PH    CM 

CO    "*    10 

CO    b- 

CO     O5 

"g    CO    C5    O 

OO    (N 

CO  O 

IO    b-    CO 

CO    00 

PH    CM    O 

CO     PH     IO 

00    O 

PH    CM 

CO    <M    PH 

a 

£    -f     10     CO 
to  O     <M     CO 

q  GO    co    co 

"H<     CM 
GO     b- 

10    b- 

00    CO 

CO  CO 
10  ~r 

00  S 

CO     CO     O5 

CO     IO    CO 
O5     O5     O5 

00    O 
05    0 

10     PH    CO 
<M     O     b- 

O5    CM     CO 

-r    CM    ix 

€*•     C^     O 

CO     CO 
CO     CO 
CM     "# 

i! 

-f     O5     CO 
CO     35     CO  . 
c:    O    f.  i 

m 

~PH     00      PH 

O5     »ft 

t,  co 

CM    10    CO 

^   O 

-f     CO    CO 

CO    05    Tf 

CO     CM 

•^     CO 

b-  b-  b- 

(X) 

o 

%?    »O     CO     b» 

35     (JO     t^ 
SO  35     PH     CO 

a  r-   oo   co 

i  i 

OO    00 

C5  -r 
CO  <M 

O5  PH 
CO  O5 

co   o   PH 

O     O5     1> 

co   -?   co 

C5     Oi    O5 

co  d 

O5    O 

b-    CO    CO 
O    GO     'O 
CM     CO     »O 
O    O    O 

c-j    -r   co 
0    0    2 

CO     CO 
"T      PH 

-f       PH 

8  i? 

b-    CM     CO 

O5    O     CM 

H 

?CO      b«      PH 

PH     00 

«  N 

05     CO    10 

IO    (M 

b-    P-    CM 

O     b-    CO 

00    CO 

CO     05 

PH      CO      f 

* 

tij    iO     b»    GO 
t-     CO     10 

60  35     I-H     CO 

a  b-  co   co 

b-   -f 

^f    CO 

co   co 

gl 

CO  05 

O5    CM     CO 
OO     I-     IO 
(M     Tf    CO 

05    05    05 

CO    CM 

III 

IO    b-    O5 

p-.     CO     >0 
b-    CO    O 

O5     O5 
CM     35 
CM     CO 

CO     CO 

PH   co  o 

O     CO     CO 

C5     O     CM 

m 

•g  co  co   PH 

CO     PH 

CO  00 

CO    CM    10 

co  -i1 

O   «5   b- 

CO    W5    CM 

00    f 

00     CM 

CO    CO    0 

§ 

r£    CO     CO     05 
.    IO     -r»    CO 
to  O5     pH     CO 

8  2 

GO    CO 

d  co 

O5  O 
CO  O5 

l>     »0     CO 

(M    -r   co 

O5     O5     O5 

ss 

CO    O5 

C5     O5 

CM    OO     CO 

b-    ~r    CM 

PH     CO     »0 

o  o  o 

b-    O     CM 

05    t-    -r 

CO     00     O 
O     O     r-i 

CM     CM 

PH      CO 

CM     CO 

o  co 

IO      PH 

PH       PH 

-t     O5     -t 

CO    -r    PH 
CO    O    CM 
PH     (N     CM 

g 

•g   CO     -^    PH 

-*  <« 

0  CO 

CO    0    f 

CO    10 

CO     05    CO 

CO    CM    rH 

00    IO 

o  10 

0    CO    CO 

§ 

9 

*  £  8  g 

to  35     PH     CO 

a  b-    oo    co 

00    GO 

-f  O5 
CO  CO 
GO  O 
CO  O5 

CO     CO     J> 

to   co   PH 

CM     T     CO 
O5    O5    O5 

b-    CO 

O5   r- 

b-    O5 

O5     O5 

10   co  o 
o  o  o 

CO    CO    O 

IO     IO 

C5     CO 
PI     CO 

ie 

00    co    b» 

CO     CO    O5 
CO     O     PH 

0 

I 

•g  o   co  PH 

CO    CO 

t  00 

O5     b*    CO 

CO    b- 

CO    CO    00 

05     0    0 

OO     CO 

CM    CO 

-f    O5    CM 

RJ 

» 

£    GO     O     PH 

til  O5     PH     CO 
fl    b>    GO    00 

%  £ 

T    CO 
CO    GO 

IO  O 
CO  »O 
GO  O 
CO  O5 

*f     l^"     O5 

CO     PH     O5 
CM     -C     »O 
O5    O5    O5 

II 

CO    CO    00 
CO     P-     QO 

3  §  3 

ill 

CO    CO 

PH      CO 

5  g 

PH       CO       PH 

co  S  22 

p-     CM     CM 

g 

• 

-g     b-      PH      PH 
EIJ    QO      PH     (M 
05     O5     CO 

to  co   o   CM 

Q    b-    CO    CO 

t-     O5 

-4     C5 

5  S 

00    00 

00  -* 

co  ci 

-f  CO 

CO    O    CM 

CO    O5     PH 
PH     35     CO 
CM     CO     0 
O5    O5    O5 

*7  q 

1^*     O5 

O5     O5 

00    b-    CO 
CO    »0    ^ 
^     Ci     t> 

3  §3 

CO    b-    CO 

»o  06  d 

-t     PH     C5 
CO     00     35 

o  o  o 

00    CO 

CO     CO 
pi    CO 

PH      p* 

-f      PH 

SCO 
CO 
10     CO 

CO     -t    CO 
CO     O     CO 

co  o   PH 

0 

•g     -f     O5      PH 

£    05     P^     CO 

t"*         i^»         O 

tb  GO    0     <M 

a  *>   ao   QO 

CO     pH 

T^*       CO 

CO    CO 

eg  05 

CO  CO 
CM  PH 
CO  O 
CO  O5 

CM     CO    PH 

CO     pi     CO 
05     CO     CO 
PH     Pi     >0 
O5     O5     C5 

CO    CO 
Tfi     CM 
b-    C5 

C5    O3 

PH  q  co 

PH     GO     CO 
0    b-    10 

r—  1     O-J     -f 

000 

CM     10     CO 

PH     CO 

CO    "* 
CO     -^ 
CO     IO 

•^   co 

CM    CO     -f 

CO     CO    CO 
PH    CO     T 
GO     O5     PH 

N 
0 

•g  PH   co  q 

^    CO     10     -f 
to  30     O     CM 

a  b-   co  co 

05     CO 

§1 

CO    GO 

O5  IO 

O  O5 
CO  35 
CO  CO 

co  q  q 

O5    CO     IO 
j>    CO    -1* 

PH     CO     >0 

O5     C5     O5 

f-     PH 
»O     >O 
CM    O 
b-     05 

05     05 

CO    -^    CO 

co  d  co 

§CO     CO 
CM     -f 

00    FH    10 

O   -r   co 

PH    CO     10 

££§ 

b-    OO 

CM     O5 

CO     -f 

co   co 

-f     CO 

10  co  q 

O     CO     CO 
CO     05     PH 

•g"  co  co  o 

O    CO 

CO  00 

n*  b-  oo 

CO    CM 

IO    b-    b- 

"t    O5     CO 

CO    OO 

05     05 

O5    CO     CO 

1 

£    0     CO     10 
to  00     O    CM 

a  t*  co  co 

JO    CO 

-f     CO 
CO    CO 

o  co 

05  1^ 

CO  00 

PH      t     CO 
CO     -f    CM 

S£ol 

O    CO 
b-    CO 

05    05 

IO    CM     CO 

CO    CO    C5 
05     CO     CO 
»O    b-    C5 
000 

d  d 

PH      CO 

PH     CM 

"T     CO 

-f    O    10 
CO     0     PH 
b-    O5    PH 

PH      pH 

—     —     — 

5 

1 

21""1 

»o  co   b- 

CO    CO    CO 

00    O5 

CO     CO 

q  PH 

CM    CO    -f 

IO    CO 
-t     Tf 

b;    CO    O5 

q  j-<  ci 

IO    IO     »O 

CO     -f 
IO     »O 

IO    CO 
10     IO 

1>    CO    O5 

IO     IO     O 

f 

D 

A 

PH     pH 

D 


39 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. GUYOT. 


£ 

•s 

^  p 

0   PH 

CM  eo  ^ 

IO  CO 

b-  OO  O5 

0  PH 

(M  CO  -f 

VO  CO 

b-  CO  05 

0  PH  CM 

eo  'f 

1 

i 

1 

•5 
£•< 

I  -a 
J| 

1 

CO  PH  b- 

eo  oo 

CO  i> 

-v  p  »n 

O5  PH  CM 

-f 

to 

O5  -t 
CM  Tf 

00  CO  00 
t£5  J>  00 

*l  **:  1 

C5  PH  CO 

g 

H 

PH  CM  CO 

^  to 

CO  t^  00 

Cl 

1—  1 

CM  eo 

•^  to  co 

l>  CO  O5 

3-  0 

05  oo  r* 

i-  r- 

1*-  O5  PH 

tO  05 

10  CM  O5 

05  0 

CO  t-  f 

PH  CM  't 

00  10 

1 

^  CM  OO 

CM  CM  CO 

CM  00 

CO  CO  CO 
CO  Ci  -f 
lO  CO  CO 
CO  CO  CO 

PH   CO 

o  10 

0   PH 

10  CO  IO 

O  IO  O 
CO  -T  CO 

IO  O 

0  CO  CM 

0  O5  t 
O  PH  CO 

10  IO  tO 

l>-   p-l   "T 
00  CO  t^- 

tO  to  lO 

CO  CO 
—  IO 

C5  O 
10  CO 

w 

s 

C  CM  CM 

CM  CM  PH 

CO  O5  >O 
l^  UC  0 
CM  CM  CO 

CM  CO 

CO  CO 

CO  00  CM 
CM  1>  CO 

lO  CO  CO 

co  co  eo 

%  8 

O5  P- 

co  t 

0   PH   PH 

C5  -T  O5 

01  -r  to 

-f  -r  -T 

O  CO 
T  CO 
t-  CO 

-T   -T 

IO  CM  t>- 

CO  OO  CM 
0  PH  CO 
•0  10  10 

CM  ;o  p 

-T   JO   t- 
tO  10  10 

CM   Tf 

O  -f 
05  0 
IO  CO 

•£  co  b- 

CO  05  0 

CM  •** 

CO  05  CO 

OS  to 

CM  PH  pH 

CM  tO 

C5  to  eo 

CM  >*  00 

-f  CM 

0 

C5  IO 

CO  CO  CO 

PH   t"*-   CO 

t-  co  o 

CM  CM  CO 

O5  IO 

PH  CO 

»>•  CM  »>. 

0  CO  PH 

lO  CO  CO 

co  co  eo 

0  CO 
J>  CM 

IO  CO  CO 
t^  CM  «- 

CM  "T  IO 

-*  -3<   T1 

10  CO 
CM  t^ 

J^  CO 

o  t^  eo 

•M  CO  PH 

o  PH  co 

•0  10  IO 

00  CM  10 
tO  IO  »O 

$  8 

CO  O 
10  CO 

i-f  CO 

CO  O  CM 

-t  l>- 

0  1*  05 

co  eo 

PH  0  PH 

eo  t- 

N  OS  t>- 

t>  O  to 

CM  PH 

1 

£  t^  05 

•  co  o 

B°  CM  CM 

O  CO  CM 
t^  CO  O 
CM  CM  CO 

00  IO 
t-»  CO 

PH   CO 
CO  CO 

CM  t^  PH 

-?  ss 

co  eo  eo 

!§  § 

O5  pH 
CO  ~V 

CO  PH  CO 

CM  -t  10 

*!*    -f    -f 

0  CO 
I"  CO 

CO  CM  CO 

§  5  3 

to  to  to 

CO  00  PH 
-P  CO  CO 
't  tO  »> 
IO  IO  16 

-r  co 

i  i 

4 

~PH  f 

t-  0  CO 

co  o 

-J  05  to 

CM  O 

05  O  PH 

•<*  CS 

IO  CM  CM 

eo  co  CM 

O5  O5 

a 

M 
rt 

o 

tS  PH  eo 

CO  CM 

tj,  co  10 
a  r.M  CM 

CO  t  O 

co  oo  o 

SI 

O  PH  CO 
I-  CO  OO 

Tf   CO   l^ 

3  8 

c^  o 

-r  co  co 
-t  O5  -r 

(M  CO  10 

vo  eo 

CO  CO 

PH  CO  -f 

05  eo  oo 

05  PI  CM 

05  eo  j> 

CM  t^  — 

~r  10  t» 
to  10  10 

C5  PH 
10  O 

CO  O 
IO  CO 

O 
<n 

5 

13  CO  CM 

CO  O  -t 

00  CO 

CO  -f  PH 

C5  QO 

CO  05  CM 

IO  PH 

00  CO  CO 

CO  CM  O5 

t^  00 

3 

0 

^  -P  O 
B°  CM  CM 

g  s$ 

CO  CO  O5 
CM  CM  CM 

-r  O 

PH   CO 

CO  CO 

0  CO  PH 
CO  PH  l^» 

-«  co  r- 

c^  t^ 

C".  O 

O5  O  PH 
CM  QO  CO 
CM  CO  IO 

0  05 
CO  CM 
CO  CO 

CO  CO  05 

r**  CM  co 

05  p*  CM 

-t  O5  CM 

PH   IO   O 

IO  l>» 

-r  co 

QO  O5 

to  to 

•§  to  O 

to  o  m 

0  CO 

CM  05  l^ 

co  co 

CO  00  CM 

co  eo 

0  O  0 

eo  oo  10 

"*   CO 

M 

*"  CM  C5 

£8  CM" 

CM  CO  CM 

CO  '00  O5 
CM  CM  CM 

CO  CO 
CO  CO 

10  O  to 

T  CO  t^ 

CO  CO  CO 

O5  CM 

T  IO  CO 

SM  CO  IO 

to  -r 

CO  PH 
CO  00 

CM  O5  tO 

-r  to  to 

o  -f  cc 

O  -pj"  GO 

•^  to  co 
to  10  to 

S  2 

CC  O5 

10  m 

•g  CM  00 

-f  O  O 

CM  O5 

CO  -f  CO 

CM  eo 

•^  00  CM 

*-  <# 

eo  eo  in 

CO  -t  CM 

CM  -f 

9 

to  co  -f 
a  CM  CM 

co  r-  co 

eo  O5  10 

CO  I-  Oi 
CM  CM  CM 

tO  CM 

CO  CO 

§11 

O5  -f 
CO  0 

C5  O  PH 
O5  IO  O 

PH  CO  tO 

0  05 
tO  C5 
CO  »> 

O5  O  CM 

to  o  t 

g§  S  5 

CC  O5 
IO  tO 

-g  05  co 

CO  O  t^ 

•*  CM 

0  00  00 

00  O 

eo  i^  CM 

CO  CO 

tO  CO  O5 

eo  o  05 

05  CM 

• 

_£  IO  CO 
05  10 
to  OJ  -T 

a  CM  CM 

0   PH   0 

CM  CO  -f 

co  r-  05 

(N  CM  CM 

1  15 

co-  eo 

-r  O5  -r 

PH  CO  CM 

-r  10  t^- 

co  co  eo 

t^  CO 

CO  O 

-t  to  co 

00  CO  00 

to  -r 

CO  CO 

co  r^ 

CM  O5  IO 
CO  t-  CM 

05  O  01 

pi  CO  O5 
|>.  —  10 

CO  <0  CO 
IO  lO  tO 

CM  '0 

C  -f 
GC  O5 
lO  10 

-g  co  -t 

CM  O  00 

co  in 

-*  eo  ** 

10  00 

PH  CO  CM 

05  00 

CO  0  CO 

00  10  IO 

CO  0 

O 

-r  to  -* 

O  CO  CM 
CO  t^  O5 
CM  CM  CM 

CO   PH 

O  CM 

00  -f  05 
O5  IO  O 
CO  1O  t- 

CO  CO  CO 

S  2 

00  O 

C5  O  PH 
CO  CM  t>. 

PH  CO  -f 

o  * 

<M  CO 

?  ^ 

PH   CO   ^H 

C5  e=  CM 
-r  10  10 

CC  i-  <  1^ 

10  0  ~f 

eo  to  co 

10  10  »0 

CC  PH 
CC  CO 

£  S 

_ 

u 
I 

1 

0   PH 

CM  eo  -* 

to  co 

t*  CO  O5 

0   PH 

CM  eo  -f 

to  co 

b-  00  C5 

O  PH  CM 

CO  "*f 

0 

•2"t 

CO  CO 

CO  CO  CO 

CO  CO 

CO  CO  CO 

t^  t» 

*"•  t^  t^ 

j^  r^ 

t^  t>-  t^ 

oo  co  or. 

(X)  QO 

p! 

a 

w 

1) 


40 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. GUYOT. 


h 

.2 

a 

10     CO 

fr—    CO    Ci 

©      l-H 

oi   eo   ** 

Hi     CO 

fr-    OO    Ci 

©  1-1 

Ol     CO     -f 

Hi     CO 

fr-    CO    Ci 

g  . 

3*t 

GO     00 

CO     00     00 

Ci    Ci 

Ci    Ci    Ci 

Ci    Ci 

Ci    Ci    Ci 

©  © 

©  ©  © 

©  © 

©  ©  ©  ! 

m 

B 

- 

J 

. 

*HJ<     fr—     ^H 

-t    00 

I-H   Hi  ci 

Ol 

CO 

co  Ci 

~  <«  I* 

©     CO 

CO 

§ 

l| 

1 

i-i    CM     ** 

Hi    CO 

00    Ci    © 
f—  1 

CM 

r"1 

CM    CO 

Hi     CO     fr- 

Ci    © 

3 

§ 
g 

1-H      O1      CO 

*^*     Hi 

CO    fr-    00 

Ci 

I-H 

CM  eo 

-f    Hi    CO 

fr-    GO 

Ci 

-tj    Hi     CO 

©    CO    fr- 

CO    -f 

CM   eo   co 

00    CO 

fr-    n    Ci 

~  fr. 

fr-    ©    CO 

es 

KJj   X<     CO 

~     0     CO 

Ci.  fr-     10 
«-     i-H     10 

jr    co    fr- 

CM    Ci 
Ci     Ol 

&  ° 

10     ©     -f 
CO     O     CO 

—   eo    -P 

£5 

Hi     C^ 

eo   10  co 

2  i  § 

CO     CO 
CM     O 

00     CO 

S  5  5 

OO    CO    CO 

Ci     1O 

—   t-   1-1 

CM     -P     fr- 

—   01   eo 

Ci    Ci    Ci 

s 

•3  -f   fr* 

u<    '^    l?5 

*2  g 

a   o    co 

1-1    Ci    O 

g  g  3 

3  §  5 

CM    CO 

ci    10 

£5 

CO     t- 

CO    CO    Ol 

10    00     CM 

—     01     -f 

©     1-H 

10     CO 

Hi     CO 
IO    CO 

Hi     Ol     i* 
©    CM     CO 
01     IO    OO 
QO    Ci    © 

GO     CO 

CO     CO 

11    -r 
01   -o 

00    QO 

CO     CO     i-H 

01   »4  ci 

fr-     ©     0) 

-P     CO     fr- 
CO    CO     CO 

-f    11 

CO     CO 
Hi     QO 

00     Ci 
00     CO 

1-1  Hi   eo 
§-r    ci 
CO     Hi 
—     Ol     CO 
Ci    Ci    Ci 

—  co    fr— 

CM    ©     i-l 

>O     i-i 

I-H    CO    CO 

fr-    00 

eo   i-i  eo 

CO    fr- 

Ci    VO    -* 

fr-    IO 

10    ©    Ci 

r* 

^   r^    — 
•-b  —  '    co 

Is  2 

—   ©   op 

T      IO      fr- 

CO     CO     CO 

IO     Ol 

CO    O 
'JO     © 
CO     fr- 

00    CO     fr- 

TO      fr-     © 

1-H       Ol       ~f 

IO     CO 

fr-   fr- 

fr-    Ci     © 
O     CO     fr- 
CO     C"1     O 
fr-     t>i     00 

©  © 

0     TO 
Ol     CO 
CO    OO 

g  g  2 

CO    OO    CO 

CO    © 

oo  Ci 
co    au 

co  01   co 

Ci      01      -T 

§  §  g 

-CO     fr. 

CM     CM     -t 

00    IO 

iO    CO    rf 

eo   10 

I-H    ©    CM 

00    fr- 

©     fr-    CO 

©    CO 

Ci     Hi     -t 

i 

•rj   r-    fr- 

IO     Ci 

£?o    S 

fr-      tO      T 
CO      fr-      ^H 

3     CO     O 

•—    no 

Hi    CO 

—    Ci     -* 
CM     H5     Ci 
—  i     04     CO 

rr     — 

CM     CO 

10     CO 

-T     CO     fr- 
Ci     01     >0 
fr-    Ci    © 

fr-  <^  oo 

fr-   fr- 

00     —  ' 

i-i   eo 

CO    <Jj 

fr-  10  eo 

-»     fr-    O 

-f   10    r- 

00     CO    QO 

11 

co   Ci   -r 

. 

13  01    fr- 

CO     CO     CO 

i—  i    Ci 

ci   eo  Ci 

©    CM 

QO    CO    1-1 

QO    00 

11  co  ci 

eo   01 

-to© 

I 

•ft 

ij    CO     CO 

CO     "T 

©CO    © 

Hi     CO 

©     Ol     -f 

frt  S 

-f    Ol    O 

oo   10 

i     CO     01 

M 
P 

^ 

i1  i  3 

CO     CO     5 

CO     Ci 
CO     CO 

^  g  g 

£  £ 

£     fr^    CO 

p-   eo 

QO     00 

-f     O     CO 
OO     OO    00 

GO    Ci 
CO     CO 

0     2     CO 
Ci    Ci    Ci 

O 

•S 

<•?»: 

-f    Hi    CO 

CO    Ol 

-t    OO     Hi 

CO    © 

CO    CO    © 

fr-    QO 

01     ©      -H 

CO     10 

GO    -t    O 

1 

1 

1 

jj-ss 

©  j£  03 

to    co    co 

Ol     CO 
CO     Ci 

CO     CO 

^-J      TO      CO 
©     Ol     CO 

©     TO 
10     CO 

CO    Ci     CO 
«-     00     © 
fr-     fr-     CO 

CO    Ci 
I-H     Ol 

00    00 

Ol    iO    fr- 

-r     IO     CO 
OO    CO    CO 

CO     Ci 
00     00 

IO     CO    © 

Ci    Ci    Ci 

1-1 

-3  ©   co 

CO     1-1     CO 

C5     Ci 

Ol     Ci     I-H 

M 
O 

|    0     -0 

-i     iO 

r=  :£    ~ 

"3     CO     CO 

©  fr^ 

1-1   -f 

CO     5s 

TO     Ci     -f 

8  S  8 

CO     —• 
CO     01 

-r    co 

-T     CO     fr- 
10     CO     1-1 
fr-    00    © 

CO     00 

s  S 

an    fr-    10 

©     CO     CO 
-P     0     CO 
OO    iJO     OO 

§!  2 

fr-    Ci 

CO    GO 

CO     —     fr* 

t     fr-     Ci 

©      PH      01 

Ci    Ci    Ci 

53  -I 

£   Ci    CO 

iO     fr-    Ol 

Ci    Ci 

Ol    QO     CO 

CO     CO 

1-1    CO    CO 

CO    CO 

-f    CO     Hi 

n    Ol 

co  eo  Hi 

® 

£  o  ~ 

^  o    — 

i—  f    ©    Ci 
CO     01     iO 
TO     >O     CO 
CO     CO     CO 

Ci     ~^ 
CO     5 

©     10     © 
«-    O     -1< 

©     Ol     TO 

;:£ 

S  8 

5  £  i 

fr-     fr^    OO 

Hi     >O 

CO     CO 

£  S3 

10      T      01 
Ci    Ol     IO 
TO     IO     CO 

OO    OO    CO 

©  fr- 

CO     O 
fr-    Ci 

CO     00 

co   Ci-   -r 

§  2  g! 

Ci    Ci    Ci 

•S  TO  co 

Hi     CO     -f 

CM    CM 

CO    CM    Ol 

-f  © 

Ci     i-H    CO 

CO    CO 

Hi    -r    fr- 

-t     IO 

©    CO    © 

® 

*    CO     Ol 

M)    ©       Ol 

^    0     CO 

fr-     CO     IO 

CO    0     -f 
TO     IO     CO 

CO     CO     CO 

£3 

fr-   ^ 

CO     CO 

•O    Ci    Ol 

©     —     CO 

l-H      Hi 

co    Ci 

-f     IO 

fr-      ©       fH 

Ol     CO     Ci 

<-    OO     Ci 

Ol     01 

n     Ol 

OO     00 

Ol    —i    Ci 

^      H      TO 

eo   10   co 

CO    CO     -Jj 

fr-   -f 

z% 

CO     CO 

i     CO     01 
Ol     t    fr- 

0     n     Ol 
Ci    Ci     Ci 

,0  Ci   10 

-f    10 

©  fr-  fr- 

©  fr- 

CO    Ci    IO 

Hi    CO 

Hi     H>     Ci 

co  co 

CO    CM     Hi 

0 

to  £  2 
=  1   2 

TO     CM     1-1 

CO     CO     CO 

CJ     CO 
CO    © 
fr-      T> 

CO    CO 

eo   oo   co 

©    —    CO 

co  •" 

-r     CO 
-f     10 

-f     CO     CO 
fr-    CO    Ci 

©    CO 
00    00 

Ci   oo    to 
CO    Ci    Ol 
TO    -r    CO 
CO    QO    00 

iO    CO 
fr—     OO 

CO     00 

§'      CO     10 
—     o>l 
Ci    Ci    Ci 

1 

o 

a 

IO     CO 

fr-    CO    Ci 

©   — 

Ol    CO    -f 

IO    CO 

fr-    CO    Ci 

©  — 

01     CO     — 

Hi     CO 

fr-    CO    CJ 

1 

CO     CO 

•r     CO    '» 

Ci    Ci 

^    Ci    Ci 

Ci     Ci 

Ci     Ci    Ci 

N  ^ 

o  ©  © 

©   © 

4>  o  © 

* 

I 

I) 


41 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. GUYOT. 


1 

i 

0    PH    CM    CO    ^ 

m  co 

b- 

00    05 

0      PH 

CM     CO     -* 

in   co 

b-    00    O5 

0      PH 

CM     CO     -I" 

i 

q 
H 

CM    CM    CM    CM    CM 

CM    CM 

CM 

CM    CM 

CM    CM 

CM    CM    CM 

CM    CM 

CM    CM    CM 

CM    CM 

CO    CO     CO 
CM     CM     CM 

1 

^        CM     f     CO    00 

0    CM 

-t 

b-    05 

PH      CO 

-t    CO 

b-    GO    O 

PH     CM 

I 

M     S 

$        PH    CM    CO    rf 

CO    b- 

GO 

05    0 

PH    CM 

CO      Tf 

m  co  co 

C5    O 

1 

PH    CM    CO     rf 

lO     CO 

^ 

QO    O5 

PH    CM 

CO    Tt< 

m   co   b- 

CO    C5 

•g   0    CO    CO    0    05 

CM    05 

PH 

b»    00 

CO     -f 

O5    GO     CO 

PH  in 

^t    00    b- 

0    0 

-t*    -f    CO 

O 

£    CO     35     CM     10     CO 

35    PH    -r    co   QO 
bb  "I1    CO     b-    OO    35 

§    2 

1 

QO    b- 

CO    CO 

O    O 

CO     -1* 
O     CM 
i>-    00 

PH  co   m 

PH       CO 

C5     O 
CM     T 

PH     lO     C5 
CM     CO     ~t 

10    CO    b- 

CO     CO 

co    b- 

00    O5 

co  o  PH 

CO     O     P- 
O     VI     CO 

CM     CM 

CM 

CM    CM 

CM     CM 

CM     CM    CM 

CM     CM 

CM     CM     CM 

CM     CM 

CM     CM     CM 

•g   CO    CO    CO    00    b- 

PH     05 

GO 

g.  TO   »^  o  CM   -t 

1-1    GO     O     CO     0     b- 

£'2  £  5  S  2 

CO     CO 
O5     PH 

w 

CO 

0    <§ 

O5     PH 
CO    CO 

CO    -r    O 
0    2    S 

CM     CO 

O    CM     CO 

10     CO     t- 

UC     05 

£  2  g 

0     0 
CM    CM 

§ 

CM    CM 

CM    CM 

CM    CM     CM 

CM    CM 

CM     CM    CM 

<M    CM 

CM     CM     CM 

•g   CM    05    O    CO    CO 

05    00 

,_ 

00    O 

b-    00 

**  -*  o 

o  in 

xn  o  o 

-f      "H/ 

0    0    CO 

s 

;vj    PH     -P    CO     C5     CM 
b-     O5     PH     -f     CO 

bb  -f    »o   i^   oo   35 

§§  5 

O    CM 

CM 

CO 

-t    -r 

CM     PI 

1  i 

co  m  CM 

p->     CO     lO 

O5    O     PH 

00    CO 
CO     00 
CM     CO 

00    CO     b- 
05     P-     CM 
-T     CO     b- 

o   co 

f     10 

00     C5 

CO    CO     C5 

co    r-   co 

O     PI    CM 

WPH       PH       PH       PH       PH 

CM    CM 

CM 

CM     CM 

CM     CM 

CM     CM    CM 

CM    CM 

CM    CM    CM 

CM    C<J 

CM    CM    CM 

•g  co  co  oo   -t  Tf 

CO    b- 

f_| 

O5     PH 

CO    O 

b*    CO    ^1* 

**     05 

o  co  co 

!—       PH 

b-     00      Tt< 

2 

£    GO    CM     10    00     O 

^  m   QO   o   CM    «o 

bb  T1     lO     b«     OO     35 

§35 

CO 

2 

CM     CM 

co   m 

-r    »o 

O    O5 
b»    QO 

CO    CO    O 

^        ^SJ         •_.* 

C5     O     PH 

CO     PH 
10     b- 
CM     CO 

b-  pi  in 

co  o   PH 

•f    CO    b- 

C5     CM 
CM     T 

CO     05 

3  8  B 

O     —    CM 

Ij  2  pH1  2  2  S 

CM    CM 

CM    CM 

CM    CM 

CM    CM    CM 

CM    C<J 

CM    CM     CM 

CM    CM 

CM    CM    CM 

A 

•g   -f    CM    in    PH    CM 

b-    b- 

1_( 

O5     CM 

0     CM 

05      PH      b- 

oo   -t 

m  PH  CM 

b-    00 

lO    CO    CO 

i 

g 

o 

£  co  o   co   co  co 

"    T     b-    O5     PH     CO 

bb  "t   m   co   oo   35 

C5    O 
10    CO 

O    O 

o 

O    O 
CM     -f 

-f     lO 
O    O 

O5    b* 
CO    b* 

-f    (M     CO 

-t  o 

"f     CO 
CM    CO 

m  o   -f 

t^    O5    O 

-T     10     b- 

b-    O 

CO     C5 

co   m   b- 

O     —    CM 

fe 

CM    CM 

04 

CM     CM 

CM    CM 

CM     CM    CM 

CM    CM 

CM    CM    (M 

CM    CM 

C-l    CM    CM 

ja 
1 

-g    O     C5     CM     C5     O 

co  co 

i_| 

0    CO 

PH       -f 

CM     t    PH 

CM    05 

0    b-    CO 

Tf      CO 

CO     10    CM 

I 

* 

ij    -f     b^     PH     CO     CO 
CO     >0    00    O     CM 
bb  -t     >0     CO    00    C5 

b-    CO 

i? 

GO 
Ol 

§  s 

-r   «o 

-r    co 
CO    b» 

IIS 

CO    CO 

8  c! 

-*     OO    CM 

CO     b-    O5 

-T     10     CO 

co   cl 

01     -f     CO 

co    -r   in 
o   —   CM 

hH 

W     PH      PH      PH      PH      PH 

CM 

CM    CM 

CM    CM 

CM    CM    CM 

CM    CM 

CM    CM    CM 

CM    CM 

CM     CM     CM 

•g    »0     10    05     CO    05 

in  in 

0 

0« 

eo  co 

«*    b-    f 

to  co 

in  CM  -<f 

PH       CO 

O    CO    0 

M 

tb  -"f     >0     CO     «^     C5 

8   ~ 

£ 

CO     10 

o  o 

CO    b* 

CM     CO 
CM     CO 

m  ca  oo 
-r   m  co 

e  § 

CM    CM 

CM 

CM    CM 

CM    CM 

CM     CM    CM 

CM     CM 

CM    CM    CM 

CM    CM 

CM    CM    CM 

-g     PH      PH      CO      -f      b- 

CO    ** 

0 

o  m 

"*    00 

i>  b  oo 

PH      CO 

PH     OO      PH 

b-    0 

CC     PH    O5 

o 

tl    O5     CO     CO    C5     -H 

"  o   co   >o   t-  o 

bb  1*     lO    CO     f~    C5 
P    O5     O5     O5     O5     O5 

CO    ^ 

(M     -t 

10 

CO 

§ 

I?  3 

cc    >o 

CO     —  i 

s  bt 
%  % 

O5     b-     CO 

m   r-   05 

CO     O5     O 

o   m 

S  2 

pi   m  o 

-f     10     «^ 

-T     lO    CO 

CO     C2 
b-     GO 

C5     CM     CO 
O     CM     CO 
O    P-    CM 
OJ     CM     CM 

m 

•g  b-  co  eo  PH  m 

CM    CO 

0 

0    CO 

in  o 

05     CO     PH 

m  CM 

CO    CO    b« 

^    CO 

in  oo  b- 

H 

c2  co  d   -t  b^  05 

35     CM     T     CO    00 

n3  §5   05   en   05   05 

PH     CM 

PH      CO 

CO 
lO 
CM 

o 

CO    CM 

S3 

PI    CM 

o  o 

b-     10     CM 

t     CO     00 

—     CO 

C5     t    CO 
CM     -r     10 

-t     10     CO 

CM     >0 
b-    OO 
b-    00 

CO    0    CM 
O5     •—     ft 
3-5     PI    CM 

CM    CM 

CM 

CM    CM 

CM    CM 

CM    CM    CM 

CM    CM 

CM     CM    CM 

CM    CM 

CM     CM    CM 

•g   CO    t    0    05    CO 

PH      CO 

O 

pH    b> 

b-    CM 

CM    CO    10 

05    CO 

p-     05     CO 

0     CO 

CM  co  in 

O 

£   -r    co    CM    -f    t-1 

oo  o  co  m   b- 
tb  co    m   co   r-   co 

C5     PH 

01 

PH      0 

CO    00 

co    •* 
o  o 

O5     CO 
C5     PH 

CO     CO    O 

i  1  2 

CO    CM 

co  o 

PH       CO 

QO    CM    b- 

~t   >n  co 

g    g 

or-   35   PH 

35     O     CM 

1 

i 

.d 
I 

"*  ti 

o  PH  CM  eo  -t; 

10    CO 

5 

CO    O5 

pH      pH 

CM    CM 

lei 

CM     CO     -£ 
CM     CM     CM 
CM    CM     CM 

lO    CO 
CM     CM 
CM    CM 

b^    CO    OS 
CM     CM     CM 
CM     (M    CM 

O      PH 
CO     CO 
CM    CM 

CM     CO     -^ 
CC     CO     CO 
CM     CM    CM 

42 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. GUYOT. 


1 

.a 
o 

m  co 

«>    CO    Cl 

O    PH    d 

eo   *r 

10    CO 

I**    OO    ffi 

O    1-1 

d    CO    t 

\o  co 

1 

l>«    CO    Cl 

1 

to 
c 
M 

CO    CO 

d  d 

CO     CO     CO 

d  d  d 

d  d  d 

d  d 

d  d 

d  d  d 

10     10 

d  d 

in   m   in 
d  d  d 

10    IO 

d  d 

m  m  m 
d  d  d 

1 

1-  d 

d  eo   •* 

in   10 

CO    1> 

q 

I-H      I-H 

1-H      F-      d 

d  d 

d 

1 

N 

-  d 

1 

g  -- 

CO    -^    IO 

CO    t> 

CO    Ci 

I-H 

d    CO 

^  in  co 

»    CO 

Cl 

1 

I-H     d 

co  TP  m 

CO    t* 

CO    Ci 

- 

d    CO 

•f    10    CO 

*"    00 

01 

•g   CO    CO 

-f    Cl    O 

CO    1-1    CO 

d    O 

TJ*  in 

F-H     CO     1-* 

^  d 

00    Ci    CO 

Cl    »> 

CO    f    t- 

§ 

£<  ^  £2 

ti)  -p  in 

C  1    CJ     d 

a  d  d 

CO    d    d 
CO     t-     CO 

d  d  d 
d  d  d 

O    Ci     CO 

o  o  S2 

d     CO     CO 

d  d  d 

Cl    O 

d  d 

IO     ?O 

d  d 

ill 

CO    t- 

CO    CO 

O    i-* 

d  d 

d    CO     t 

CO    0 
10     CO 

d  d 

ci   eo   -P 
10  10  10 

1-    CO    Cl- 

~r   Tf   •"* 
d   d   d 

•g  t-    eo 

**   O    d 

O    CO    1-1 

^1*    CO 

CO    Cl 

CO    00    CO 

O    Ci 

•*    CO    CO 

t-    CO 

FH  eo  i-i 

00 

£J  —i    d 

"    -*     CJ 
tB  ~P     IO 

d     d     l-H 

CO    f    lO 

0    CO     CO 

CO    O 
CO    Si 
d    CO 

CO    d 

ci  o 

Tf       CO 

CO     CO    CO 
0      ^H      P^ 

t^    CO    Ci 

g* 

O     CO     CO 
CC     CO    CO 

d      CO      -T 

CO    O 

IO    CO 

d    CO    t 

-T      -P      -P 

t^    CO    Cl 

Wd   d 

d  d  d 

d  d  d 

d  d 

d  d 

d  d  d 

d  d 

d  d  d 

d  d 

d  d  d 

•g  co  d 

-*  O  eo 

p-»    10    CO 

J>  »> 

d  eo 

O    CO    CM 

in  m 

F-l     CO     I-H 

Tf     f 

O    d   O 

0 

vn  ™T"   in 

B    CJ     CJ 

tq  d  d 

F-l        F-l       0 

CJ     CO     -P 

S  £8 

d  d  d 

•**  m  co 

Cl     CO     CO 

d  d  d 

t>   t- 

1  1 

CO     Cl 

d  d 

CO    GO     Cl 

d  co 
d  d 

O   eo  co 
d  d  d 

d     CO     -f 

d  d  d 

10    CO 

d  d 

CO     CO     CO 
t»    CO     Cl 

—     —    — 

d  d  d 

•g  m  d 

Tf     1-1      "* 

d    CO    10 

q  q 

CO    t* 

»O    OO    t- 

F—  1      P-H 

l^    O    CO 

d  d 

CO    F-    O 

s 

(2  ci  d 
ao   O 

to  CO     >0 

2  d  d 

co   f-  co 

3  5  S 

OS    O    I-H 

0    § 
d    CO 

§s 

1-  d   t- 

co  ci  ci 

CO     t-    CO 

d    CO 

ci  co  10 

CO    0 

F-l      CJ 

10     CO 

d     Cl     d 

t»    CO    Cl 

H  d   d 

d  d  d 

d  d  d 

d  d 

d  d 

d  d  d 

d  d 

d  d  d 

d  d 

d  d  d 

^*  co  co 

CO    CO 

Ci    CO    d 

0   0 

l^   0   Ci 

a 

* 

£  06   ci 

Cl    Cl    CO 

d    CO     *f 

Cl      O      —  H 

ell 

CO     <-O 

co   r- 

•^     lO 

CO    d     h» 

t*-    00    GO 

F-:  .0 

Cl    Ci 

8  ° 

F-     CO     -t 

10     CO 

^     CO    CO 
FH      1-1      PH 

t^    CO    Cl    j 

a 
o 

H  d   d 

d  d  d 

d  d  d 

d  d 

d  d 

d  d  d 

d  d 

d  d  d 

d  d 

d  d  d 

1 

•s  t  t 

-t    CM    >O 

m  o  o 

10    CO 

CO    10 

eo  t-  i- 

CO    -f 

o  -p  co 

OO    Cl 

10    Cl    CO 

! 

1 

ti  co    -* 

CO    CO     »> 

co  ci  o 
m  co  QO 

co  in  co 

Cl    O     « 

d    CO 

*f    O 
10     CO 

co  <-i  co 

CO    l>.    l^ 

CO     t-    CO 

i-i  m 

ss 

ill 

t^    Cl 

s?  s 

0    || 

H  d   d 

d  d  d 

d  d  d 

d  d 

d  d 

d  d  d 

d  d 

d  d  d 

d  d 

d  d  d 

"S  t  q 

•*    d    «0 

CO    d    d 

CO    O 

l>    Cl 

00    d    <N 

CO   O 

»    i-i   0 

10    t^ 

w 

^    10     CO 

t^.   t»  co 

l>    CO    Cl 
10     CO     t- 

O      1-H      d 

Ci     t>» 
C1    CO 

CJ     CO 

S3  °f 

-r   10 

m  co  co 

CO    *>•    CO 

II 

co  d   in 

t*    Cl 

CO    CO 
-*     IO 

i  i  1 

pj  d  d 

d  d  d 

d  d  d 

d  d 

d   d 

d  d  d 

d  d 

d  d  d 

d  d 

d  d  d 

•g  d  o 

-*  co  r- 

t*    CO    ^ 

1-1    CO 

O    CO 

d  »>  r* 

**  to 

CO    CO    t"* 

eo  in 

d    to    I* 

» 

f£    >0    CO 

_  -r    10 
a°  d    d 

CO    CO    *O 

-t     CO     I-H 

co   o    JH 

CJ     CO 

il 

m  o  m 

CO     U     GO 

CO    CO 

CO     r~     -f 

F-l       d       CO 

t^    Cl 

F-t      d       CO 

CO    CO    CO 
CO    t^    00 

pq  d   d 

d    C^    C<1 

d  d  d 

d  d 

d  d 

d  d  d 

d  d 

d  d  d 

d  d 

d  d  d 

•g  O   Ci 

^*    CO    GO 

Ci  in  i> 

CO    CO 

CO    » 

CO    d    CO 

Cl    d 

O    *f    IO 

O    CO 

F-l      IO      CO 

N 
0 

d,ii  3 

CO    Cl    O 

CO    O 

§  S 

d    CO 

d  d 

-f  o  m 

CO    ^f    ^* 

co  t^»  co 

Cl    t 

00      I-H      -f 

m  co  co 

F-       d       CO 

t^    Cl 

5  S 

F-I    d    co   ! 
t^  r^  t> 

co   i>  co 

a  CM  d 

d  d  d 

d  d  d 

d  d 

d  d 

d  d  d 

d  d 

d  d  d 

d  d 

d  d  d 

-Cl    CO 

CO    CO    CO 

0  t-  Ci 

CO    Cl 

1-  -, 

^  ^  <» 

m  co 

CO      F-l      d 

CO      "H 

Ci    -^    10 

t 

*.  2?  £? 

o°  ci   d 
3  d   d 

•^  m  co 
in   co   r>- 
d  d  d 

i**    C/)     QO 

ci  o 

-i    CO 

t     1O 

eo  co 
d  d 

d    CJ    CO 

w  " 

Cl    O 
d  d 

T     IO     IO 

^r    -r    -5 
d   d   d 

co  ci 
in   o 

-r    10 

d    d 

O    CJ     CO 

co  co  co 

5  5  3 

d  d  d 

Barometer 

a 

si 

CO    CO 

d  d 

bj    CD    Cl 

CO    CO    CO 

d  d  d 

O     1-H     d 
-T     -4     -t 
d     d     d 

S  3 

d  d 

»n  to 

-r   T? 
d  d 

»>•    CO    Cl 

d  d  d 

O     1-H 

in  10 
d  d 

d    CO    •* 

10  10  10 
d  d  d 

in  to 
10   in 
d  d 

b;    CD    Cl 

10  in  in 
d  d  d 

D 


43 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. GUYOT. 


8      A 

ial 

|    | 

9  '"t 

CO    CO 
CM    CM 

01  co  Tf 

CO  CO  CO 
CM  CM  Ol 

to   co   t> 

co  eft 

O  PI  Ol 

CO     -t 

IO  CO 

t^    00    Cft 

O  n 

01    CO     -t 

CM     01    Ol 

CM    CM 

Ol  CM  Ol 

01    CM 

CM  01 

CM     CM    CM 

CM  Ol 

CM    CM    CM 

Thousandths 

S-f 

"  a 

1 

O  0  Cft 

Cft    Cft    Cft 

Cft     CO 

CO 
CO 

0 

Cft  CO 

I-H  oi 

t^     t^     CO 

to  to 

-f 

n  OJ  01 

CO    ^    iO 

CO     l> 

co   TT   to 

co  t- 

CO 

i-i  CM  CO 

f     10     CO 

t^    00 

Cft 

- 

CM  CO 

f    tO    CO 

t»  00 

Cft 

Ilundredths  of  an  Inch. 

0 

o 

i  to  -f 

0  1  Cft 

-f    to    01 

iO    IO 

CM  -f  CO 

Cft    PI 

Cft  10 

t^    CO    O 

CO  PI 

co  co   i^ 

tio  o   — 

B    •O     tO 
M    CM     CM 

-T  CO  n 
iO  O  to 
Ol  CO  -f 
10  iO  10 
CM  CM  CM 

O     CO     CO 

to   f   -r 
to   co    t>- 

10     10     iO 
CM    Ol    Ol 

CO    0 
-T      -!• 
CO     Cft 
tO     iO 
CM    CM 

t^*  CC  Cft 

CC  CO  Ol 
O  -i  01 
CO  CO  CO 
CM  <M  CM 

CM     CM 

CO     -f 
CO     CO 
CM     CM 

t  Cft 
p-  O 
to  co 

CO  CO 
CM  CM 

CO     t^     PI 

t^     ?•    CO 

CO     CC     CO 
CM    CM     CM 

•^  t» 

Cft  O 
CM  CM 

S  g  g 

Ol    CM    CM 

(X) 

O  Ol  n 

IO     1>     -t 

CO    CO 

IO  CO  CO 

co  co 

10  O 

CO    Ol     t- 

O  QO 

-f  co  10 

£  •*  -* 

-r  co  01 

O     CO     CD 

IO     CO     I"- 
IO     IO     tO 
CM    CM    CM 

CC     0 

CO     CO 

to   10 

CM    Ol 

t^  CO  Cft 

CO  CO  CO 
CM  01  Ol 

to  o 

CO     CO 
CM     CM 

to  o 
o  c 

to  cc 

CO  CO 
CM  CM 

t    CC     Pi 

Cft     CO    CO 
CO     t-    CO 
CO     CO    CO 
CN    CM    CM 

ii 

O    01    -r 

CO     IO     -f 
i—    Ol    CO 

t?§  S 

W    CM     CM 

Ol  CO  -T 
10  10  10 
CM  CM  CM 

CM  CM 

CM    CM    CM 

• 

^| 

pi  CO  Ol 

t~    0>    I- 

0    p- 

eft  CM  01 

CO    ~ 

O  CO 

en  oo  co 

CO  CO 

01  -t  co 

^   CO    CO 
fcbO     PI 
C    IO     »O 
W    CM     01 

-T  CO  Ol 
CO  CC  CO 
Ol  CC  t 
IO  IO  IO 
Ol  CM  CM 

O    GO     CO 

10   to   10 

CM    Ol     CM 

Ol     01 

V:     Cft 
lO     iO 
CM     CM 

o  pi  oi 

CO  CO  CO 
CM  CM  CM 

CO     CO 
CM    CM 

CO  0 

?  S 

S  S 

-r    CO    Ol 

co    co   S 
Ol    Ol    O4 

10  CO 
CO  10 

en  o 

CM  CM 

PI     CC     10 

£  g  g 

CM    Ol    Ol 

q 

s  t  "J 

fa    -r    -f 
7    01     01 

bo  O    pi 

C    0     iO 
W   CM    Ol 

PH  -f  CO 

eft  PI  eft 

CO    -1* 

CM  co  co 

CO    CO 

IO  CM 

to   to  o 

CO  CO 

Cft    Ol    Ol 

•<*  CO  CM 
Ol  Ol  CM 
01  CO  ~C 
10  10  IO 
Ol  CM  Ol 

O    Cft    CO 
CM    CM    CM 

T     PI 

tO    iO 
CM    CM 

CO  3  CO 
CM  CM  CM 

CO     PI 

1  1 

CM    CM 

CO  P- 
00  CO 

i  i 

IO     Cft     CO 
1^     CO     CO 
CO     <-     CO 
CO     CO    CO 
CM    CM    CM 

CO  Cft 

>'.  -T 

cr.  o 

CO  »^ 
Ol  Ol 

PI     £     CO 

p-    oi    co 
CM    Ol    Ol 

tt 

• 

i*.  «? 

01  10  -f 

©    CO    PH 

CO     !>• 

CO  0  0 

r-  PH 

l_l  J,, 

Pi  Pi  t^ 

O  0 

l^    O    O 

£   -r    f 

-r  co  01 

p-    Cft    l^ 

10     10     »0 
CM    CM    CM 

tO    tfj 
CM     CM 

CO  10  PI 
Cft  S5  Cft 
Cft  0  — 
IO  CO  CO 
CM  CM  Ol 

CO     Ol 

GO     CO 

CO    CO 
O4     Ol 

£  S 

CO  CO 
Ol  CM 

§O     CO 
CO     CO 
CM     Ol    CM 

l^  0 

S  S 

CO  J- 
CM  CM 

Ol    IO    «> 

cc    oi    •— 

pi     01     CO 
Ol    Ol    Ol 

tio  pi 

a   '"5    >o 
M   CM    01 

Ol  CO  -f 

to  *o  to 

O4  CM  CM 

« 

•^  -f   to 

CM  CO  CO 

01    10    -f 

CO    0 

Cft  CO  -t 

Ol    IO 

co  eo 

*  °  ° 

H   CM    CM 

"t  CO  Ol 

o  o  o 

Ol  CO  "T 
10  tO  »0 
CM  CM  CM 

pi    Cft    t- 

10     10     10 
CM    CM    Ol 

2579-1. 
25892. 

CO  10  PI 
CD  QC  00 

IT  CO  CO 
CM  CM  Ol 

J>    Ol 

01     CO 
CO     CO 
Ol    Ol 

t»  01 

CO  CO 

S  § 

CM  CM 

CO     O     "1* 
IO     iO     -1* 
CO     J--    rr> 
CO     CC     CO 
CM     CM    CM 

r-  o 

ss 

co  r- 
Ol  Ol 

Ol    Ol    Ol 

e 

"*     t-    CO 

pi    CO 

Ol  t^-  CO 

CO    0 

pi  CO 

01    CO    O 

-t  10 

01  to  co 

Is  3 

f|   Ol    CM 

10  10  tO 
CM  CM  CM 

Cft    CO    CO 
T     10     CO 
IO    tO    IO 
CM    CM    CM 

tO    Ol 

CO    CO 

tO     iO 
CM    CM 

Cft  IO  PI 

i-  r^  i^ 

cr.  o  PI 

IO  CO  CO 
CM  CM  CM 

28267. 
26363. 

CO  Ol 
10  10 

ii 

CO     CO     CO 
CM    01     CM 

X  PI 
OJ  01 

01  CM 

CM    CM    CM 

« 

i  co  to 

CO  00  00 

25J81.5 
25579.8 
25677.8 

-t*    CO 

co  PI  01 

o  to 

CO  CO 

CO    Cft    CO 

0  01 

Cft     CO     -!• 

tb  eft   O 
a  T    'O 

H   CM    CM 

-r  co  CM 

OO  CO  GO 
i-i  Ol  CO 
10  IO  iO 
CM  CM  Ol 

to    CM 

t^    CO 

iO     tO 
CM     01 

Cft'  co  01 

CO  CO  CO 
Cft  O  PI 
10  CO  CO 
Ol  Ol  Ol 

CO     CO 
tO    iO 

CO     CO 
01     Ol 

oo  cc 
•»f  ~? 
-r  10 

CC  CO 
CM  CM 

1^     ii     IO 
CO     CC     Ol 

CO     »^    CO 
CO     CO     CO 
CM     CM    CM 

Cft  01 

eft  o 

CO  4^- 
CM  CM 

-j   r-   « 

3    Cft    GO 
CM     CM     Ol 

N 
0 

-g  01  10 

^  CO  Cft 

r-  o  PI 

CO    0 

Cft  10  CO 

10    O 

pi  Cft 

-f    IO    CO 

*>•  Cft 

CO     PI     01 

pq   CM    CM 

pi  Ol  CO 
IO  IO  iO 
01  01  CM 

£     t-    CO 

IO     to     tO 
CM    Ol    CM 

CO    CO 
Ol    CM 

Cft  CO  01 
10  iO  IO 

eft  o  pi 

10  CO  CO 
CM  Ol  Ol 

CO    *1* 

-*    -f 

Ol     CO 
CM    CM 

Cft  CC 
CC  CO 
-f  10 
CO  CO 
CM  CM 

CC    Ol    CO 
01     Ol     PI 

§    CO    S 
CM     CM    CM 

§  S 

Cft  C 
CO  f- 
Ol  Ol 

10     00     O 
Cft     OO     CO 
O     PI     01 

Ol    Ol     Ol 

• 

•g  01  to 

-t  Cft  0 

CO    Ol    CO 

Cft    CM 

CM  00  O 

Cft    -f 

CO  -f 

Cft    pi    Cft 

-f  CO 

-f    Cft    O 

tfl  S»     O 

"""*  CO  CO 
CO  CO  CO 

CM  CM  CM 

•—    O    CO 
CO    CO     IO 
-T     10     CO 
IO     iO     tO 
CM    CM    CM 

tO    CO 
•0    IO 
t-    GO 
10     10 
Ol    Ol 

O  CO  CO 

eft  o  « 

10  CO  CO 
CM  CM  CM 

CO     -t* 
CO    CO 
Ol     CO 

3  £ 

Ol  01 

CO  CO 
Ol  CM 

CO     CO     CO 

CO     CO     CO 
CM    CM    Ol 

co  3 

Ol  OJ 

CO     CO     PI 
or    i^.    j>- 

O     i     01 

01     CM     Ol 

1  i 

S  fl  *""* 

II 

o  pi 

CO     CD 
04    Ol 

Ol  CO  -H 

ihfij 

10  co   t-- 

CO    CO     CO 
CM    CM    CM 

CO    Cft 
CO     CO 
Ol    Ol 

q  p-  01 

Ol  Ol  Ol 

CO    -f 
CM     CM 

IO  CO 
CM  CM 

£••   oo   eft 

01    Ol    Ol 

O  PI 

CO  CO 
Ol  CM 

01     CO     -f 

oo    or    on 
Ol    Ol    CM 

D 


44 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. GUYOT. 


o  ja 

«  § 

S  2-1 

8'"  t*> 


co   t-  co  35       ©  I-H  CM  co  *!f 


co  t*.  GO  C5       ©  1-1  <N  co 


CO  CO  00  QO  00     35  35  35  35  55     35  35  35  35  3>     OOOOO 
CM  CM  CM  CM  CM     CM  CM  CM  CM  CM     CM  CM  CM  CM  CM     C3  CO  CO  CO  CO 


OOOO 

CJ     CO    CO    CO 


O 

CO 


35  OO  t^     CO  in  -t<  CO  CM     PH 

o  M  CM   co  »r  in  co  i>   co 


CO    b-  CO  -f  CO  CM    ©  35  l> 
CO     rA  CM  CO  -T  in     CO  CO  J> 


*'JS 


J>COCi 


CM   1-5 
o   ^ 


CCCilM          i-i 


i-'OOCOCO  OCOOQO 


CO  O 
t^OO 
OD'/D 


CO    O    O    CO 


OCi  CsC5CiO 


d) 


«-i     -*    M    CS 


.0     ^T 
CO    CO 


CO     (M     I-H     35     GO  «-     >O     ••T     CO     "^"          O     (f>     t^     IO     -T 

ajQOQOCOQO  CCCOCO35C5  35353535C5 


O    <M    CO    C5 


CO     ift    ©    CM    © 


O    —    CO    CO 


. 

in  »  co   i^  ooo5O>-iiM 

i^-t'-i-b-  I'-I^OOCOQO 

O1(M(M(M  <M<N<NC^(M 


01  —  O  oo  *^ 
eo'tooo 
aoc/jaooocf) 

CM<MCMC^«vi 


o 

ss 


» 


Cf>-<>«<>«t-t'- 

WCMCMCMCMCM 


co    cs    O    — 

t»t--COCO 

CMCMC^ISM 


i—    C5 

IT     ^" 
fr-    CO 


-ro  «;^-o  —  10 
—  o  co  t>-  >o  -r  <M 
-^  •-  01  CO  —  >» 

-5  CiC5S5OOi 

CM^ICNCM 


c: 

QOW3 

CMCMCM 


tbco-ro-ot» 


GO«^ 

co   -r 


CO 

t- 


i-^ 

"-<    C5 


^  35     —    C5     ~    35 

CO  CC     in    CO    CM    O 

o        •—   <>«   co   —  m 


^       co   r^  t^  -t  c 

-A       o 


7  -r*  |«  t*  l«   t« 


CO  CO  —  — 

CM     CO  -t  10  CO 

fi     CO  CO  CO  GO 

CM    CM  CM  CM  CM 


cMrHOoo*^       CO--MI-IO 

QOXICOGC)35  0>    Cb    A    A    O) 

CMCMCMCMCM          CMCMCMCMCM 


at^^t^t^t^         t^    t- 

pq    CM    CM    CM    CM    CM  CMCM 


CO     CO     O     T     CO 

00    OO     CO    CO     GO 
CM    CM    CM     CM     CM 


CO    CM    C/D    I-H    i-;  C5    -*    ir<    >0    1-1 

Ot^COOCO  i-^t^W»^CM 

CM    ©     CJ    CO     CO  m     Ct     ~i     O     35 

CO     CO    OO     GO    35  3i     ^5     35     35    3} 

CMCMCMCMCM  CMCMCMCMCM 


t*.     CO 

^  «  7* 

-r»<^- 
yCMCM 


t^in©  CM'-HCoo©  coo^C5 

'tinco  cocoin-t-?  CM«35Co 

O     -*    CO  CM     •- 1    O    35    QO  »^ 

>nCOi>-  QOC5OO--I  CM 

CMCMCM  CMCMCMCMCM 


OO 


CO 

C/D 


FHQOlOr-lb  «     (         -T     C5     CO 

i-iS5QOI^O  -^    <M     —    35    CO 

t^t^cosso  r-oico-^-f 

COOOOOQOC5  CT:Ci353535 

CMCMCMCMCM  CMCMCMCMCM 


,v  CM  -T  in  cp  t^   i>  »4  co  co  o 

A  «  ?•  s  »  s  g  i  a 


CMCMCMCMCM 


350^ 
h-COQO 
CMCMCMCMCM 


OOt>«CO-r 

t^QOC550  •CM7:7CO-C 

OOQOQOC5  ^3^353305 

CMCMCMCM  CMCMCMCMCM 


i  -g 

i«5 

II 


D 


©i-ICMCO 


ISCOt^COO 


CMCMCMCMCM 


O  rH  CM  CO  -t 
OOOOO 

CO  CO  CO  CO  CO 


OOOOO 
?5«COWCO 


45 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. GUYOT. 


H 

CQ 

O 

I 

M 

Ed 


Pi 
w 
p* 

I 

w 
«. 

H 


Pi 
O 

O 


o       * 

»    * 

g  1 


S        H 


i  a 

M 

CO 

o 

t- 

05 

o 

01 

-r 

10 

r| 

Ci 

I—  1 

71 

t 

co 

^ 

Ci 

r_t 

CO    t 

8     g     g5^ 

CO 

-f 

o 

CO 

t» 

Ci 

9. 

!— 

71 

CO 

-r 

CO 

1- 

CO' 

Ci 

o 

1* 

CO 

-f    vo 

0.0,9* 

<N 

71 

71 

71 

(N 

<M 

CM 

74 

01 

N 

M 

01 

71 

04 

<N 

<N 

01 

71 

CN    (M 

h  g-J 

0° 

10 

0 

vQ 

0 

VO 

0 

10 

0 

»0 

0 

VO 

0 

10 

0 

VO 

0 

VO 

O    vo 

[11 

O 

Ci 

2 

71 

Ci 

§ 

CO 

T 

-r 
Ci 

10 

Ci 

s 

§ 

CO 

Ci 

£ 

s 

CO 

Ci 

Cj 
CJ 

§ 

o  o 

0    0 

i  fl 

•„. 

Ci 

,_, 

co 

-f 

CO 

CO 

Ci 

,_, 

CO 

10 

CO 

CO 

0 

I-H 

CO 

10 

J^ 

CO    O 

fill 

CI 
00 

0 
Ci 

71 

CJ 

c? 

-f 
Ci 

IO 

Ci 

g 

Ci 

0 

§ 

fl 

0 

0 

0 

0 

o 

CO 

o 

Ci 

o 

0     CM 

ul 

~h  1« 

0° 

10 

0 

10 

0 

XO 

0 

iO 

0 

to 

0 

VO 

0 

10 

0 

VO 

0 

10 

O    O 

[11 

00 

CO 

CO 

71 

CO 

3 

CO 
CO 

-r 

CO 

-r 
CO 

10 

CO 

oo 

g 

CO 

00 

CO 

CO 

s 

£ 

£ 

£ 

§§ 

•  a 

CO 

.0 

t- 

CO 

o 

<N 

-f 

10 

^ 

Ci 

0 

71 

-f 

CO 

^ 

Ci 

M 

71 

-f    CO 

lit! 

§ 

g 

8 

§ 

£ 

£ 

" 

-t 

10 

CO 

CO 

Ci 

o 

00 

CO 

71 

CO 

CO 

oo 

IO 

CO 

CO 

CO 

t-    CO 

CO     00 

u-^ 

YG 

0° 

1O 

0 

iO 

0 

IQ 

o 

10 

0 

VO 

o 

10 

o 

10 

0 

VO 

0 

10 

0    vo 

i|i 

—. 

71 

<7, 

CO 

CO 

-r 

-r 

>0 

»o 

CO 

f 

«- 

{^ 

s 

CO 

c: 

Ci 

o  o 

CO 

i  O 

Ci 

r—  1 

(M 

-r 

CO 

CO 

Ci 

I—I 

CO 

-f 

CO 

CO 

o 

,_ 

CO 

VO 

CO 

CO' 

0    <N 

!§,"$ 

(M 

5 

>0 

CO 

§ 

CO 

Ci 

g 

<M 

CO 

t 

IO 

g 

8 

CO 

CO 

01 

CO 

CO     CO 

0-3      ' 

"V  a 

0° 

10 

0 

o 

o 

IO 

0 

10 

0 

IO 

o 

10 

o 

iO 

o 

vo 

0 

10 

0    IQ 

Hi 

5 

CO 

71 

CO 

CO 

co 

CO 

CO 

-r 
CO 

CO 

IO 

CO 

iO 

co 

CO 

CO 

CO 
CO 

5 

0 

CO 

CO 

00 

Ci 
CO 

Ci 
CO 

0    0 

id.. 

IO 

CO 

CO 

0 

<N 

CO 

10 

J, 

CO 

0 

<N 

n« 

IO 

^ 

Ci 

0 

71 

-r 

co   t^ 

ro  .2  S  ft 

05 

g 

71 

" 

<M 

IQ 
(M 

CO 
71 

01 

CO 

o 

CO 

CO 

71 
CO 

CO 

-f 

CO 

VO 

CO 

t^ 

CO 

CO 
CO 

Ci 
CO 

O     1-1 

-f    -t 

"V  a   . 

0° 

10 

O 

10 

0 

10 

0 

10 

c 

IO 

0 

10 

0 

IQ 

0 

VO 

0 

10 

O    vo 

HI 

i-  ft 

vo 

0 

71 

71 

CO 
10 

CO 

10 

-r* 

IO 

10 

0 

s 

s 

CO 
10 

s 

10 

oo 

00 
VO 

g 

s 

o  o 

CO     CO 

|.2^ 

0 

CO 

71 

ro 

CO 

Ci 

0 

Ci 

- 

71 

-f 

co 

CO 

Ci 

1—  1 

CO 

2 

CO 

CO 

o 

r-C     CO 

o.2w£ 

Ci 

Ci 

Ci 

•Ci 

o 

1—  1 

o 

o 

0 

0 

o 

o 

o 

"*-|j 

o® 

10 

0 

10 

o 

10 

0 

10 

0 

10 

0 

IO 

0 

10 

0 

VO 

0 

10 

0    vo 

1  ••=.§ 

— 

71 

71 

CO 

CO 

-f 

-T 

10 

VO 

CO 

CO 

t- 

t^ 

CO 

00 

Ci 

o5 

0    0 

^  fa 

ig     ^ 

co 

CO 

0 

,_< 

CO 

VO 

•CO 

CO 

0 

(M 

CO 

iO 

(, 

CO 

0 

(M 

"t 

10 

t~    Ci 

^  a  c"g 

<N 

TO 

10 

'0 

t» 

7* 

Ci 

0 

71 

CO 

-t 

10 

•f 

Ci 

0 

— 

01 

CO    -t 

a^Wft 

00 

Ci     Ci 

"**  «   ' 

0® 

10 

0 

10 

o 

»0 

0 

10 

0 

VO 

0 

10 

0 

IO 

0 

VO 

o 

10 

o   >o 

[11 

CO 

TO 

71 

CO 

U 

CO 

CO 

CO 
CO 

« 

CO 

10 

CO 

IO 

co 

CO 

CO 

co 

CO 

CO 

£ 

CO 
CO 

00 

CO 

g 

g 

o  o 
-r   -T 

".S  •  ^ 

w 

-" 

10 

^ 

0 

,- 

71 

-r 

CO 

^ 

Ci 

_ 

71 

-* 

CO 

oo 

Ci 

_ 

co    -r 

111- 

T 

g 

0 

s 

CO 

o 

s 

s 

£ 

g 

Ci 

0 
CO 

CO' 

s 

CO 

iO 

co 

CO 
CO 

co 

os 

CO 

®  £ 

>•*«• 

o'° 

10 

0 

10 

0 

IO 

0 

10 

0 

VO 

0 

10 

0 

10 

o 

VO 

0 

10 

0    0 

111 

s 

71 

71 
71 

71 

01 

CO 
<N 

% 

71 

71 

iO 
71 

£ 

s 

CO 
71 

71 

71 

CO 

<N 

Ci 

01 

Ci 
01 

o  o 

CO     CO 

i  2 

QO 

gj 

,_ 

CO 

10 

co 

CO 

0 

T—  1 

CO 

IO 

H 

CO 

0 

<N  • 

'     CO 

10 

^ 

Ci    O 

fc  a  s1^ 

10 

M 

00 

c: 

0 

71 

-r 

10 

CO 

t» 

rf) 

a 

r— 

(M 

CO 

— 

iO 

co  oo 

£-.§** 

"V-  fl   . 

0° 

vo 

0 

>O 

0 

IO 

o 

10 

o 

VO 

0 

10 

0 

10 

o 

vo 

0 

10 

o  vo 

Ill 

rH 

1-t 

71 

71 

CO 

CO 

-r 

-f 

10 

VO 

CO 

CO 

J^ 

i- 

oo 

00 

0 

Ci 

0    0 

Wft 

, 

CO 

10 

H 

JJ5 

0 

(N 

£  g-sli 

ei 

CO 

-r 

•  0 

co 

Ci 

0 

~ 

<M 

-T 

10 

CO 

t- 

CO 

Ci 

- 

01 

CO     -t 

£-Bfe* 

1-  a  . 

0° 

.0 

0 

»0 

0 

IO 

o 

10 

o 

IO 

0 

10 

0 

VO 

0 

vo 

0 

10 

o   10 

II1 

'""' 

71 

71 

CO 

CO 

•* 

T1 

10 

VO 

CO 

CO 

^ 

I- 

oo 

00 

0 

Ci 

0    0 

D 


46 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. —  GUYOT. 


II 

il°l 

!i 

0    0 
O    O 
O    O 
d    CO 

|| 

CO     t~    CO 

Cl    O 

o  o  o  o  o 

88888 

p-     d     CO     ~f     O 

0    0 

8  8 

CO     i- 

00     Cl    O 

0    0 

8  8 

PH        Cl 

888 

o  o  o 

•4 

d 

o 

"i  o 
* 

0    0 

0    0 

O    0   0 

0    O 

o  o  o  o  o 

0    0 

0    0    O 

O    0 

000 

0      0 

•s  ^ 

(N    CO 

Tf*      lO 

IO    CO    b- 

OO    Cl 

O     PH     Cl     CO     -t 

10    10 

CO     <>    CO 

01    0 

PH       d       CO 

*?  ^ 

0    0 

0    0 

0    O    0 

0    0 

d  d  d 

0      0 

•s  «? 

10    CO 

PH      " 

CO    Cl    d 

-  b- 

O      CO      XO     QO      PH 

CO    CO 

Cl    d    -t 

b-    0 

d    10    00 

£0 

0    0 

PH     PH 

PH      PH      d 

d  d 

CO    CO    CO    CO     -P 

Tf      ^5- 

rf    10    10 

10    CO 

CO     CO    CO 

0      0 

-s  «° 

C^     ""^ 

00    CO 

b-    d    CO 

PH       IO 

O     t1     Ci     CO    CO 

d  b- 

PH    CO    0 

IO    Ci 

-f    CO    CO 

&  ® 

1  ® 

0       PH 

PH        d 

d    CO    CO 

TJ.    rr 

XO     IO     IO     CO    CO 

b-    b- 

CO    00    Cl 

O3    Ol 

0    0    PH 

4J        ^ 

JO     C5 

•  0       PH 

QO   "t  o 

b-    CO 

Cl     iO     CJ     CO     T 

p-    b- 

CO    O     CO 

d     CO 

XO       PH       j> 

S5  5* 

g    0 

PH      PH 

d    CO 

CO    Tf    10 

10    CO 

CO    b«    CO    CO    Ol 

0    0 

PH       d       d 

CO     CO 

Tt»       XO       IO 

£v  ^ 

r*< 

0       0 

«   °° 

CO    f 

d    0 

QO    CO    rj« 

d    0 

QO    CO     f    d     PH 

Ol    b- 

iO    CO    PH 

03    b- 

xo    CO    PH 

S  o 

PH      d 

CO    •<* 

Tf     1Q     CO 

l>    CO 

CO    Ci    O    PH    d 

d    CO 

-r   xo   co 

CO     b- 

co   ci  d  I 

w  ^ 

PH. 

•H     <^J 

0       0 

*>  ® 

Cl    CJ 

Cl    Cl 

OO    CO    CO 

QO    b- 

b-    b-    b-    CO    CO 

CO     CO 

IO    xo    xo 

IO     *t 

TJ«      Tf      CO 

g     PH 

PH    CM 

CO    •* 

iO    CO    b- 

00    Ol 

O    —    d    CO    "* 

10     CO 

b-    CO    Ol 

d     CO     -t 

M  *5 

d  d 

o     o 

*>    PH 

CO     -<f 

CO    b- 

CO    O    PH 

CO    -t 

xO    b-    QO    O    PH 

d      Tf< 

10    b-    CO 

01    -« 

71     —     10 

91  0) 

g     PH 

CN    CO 

•t  10 

CO    00    Ci 

0      PH 

d  co  «p  co   t- 

CO    01 

O        PH       Cl 

CO    XO 

Cv    ^ 

d  d  d 

0      0 

1^    CO 

CO     Cl 

d     XO 

CO     PH     ~f 

b-    O 

M     CO    Cl     d     iO 

CO     P- 

-r   b-   o 

CO     CO 

Cl    d    xo 

2  § 

CN    CO 

xO    CO 

b-    Cl    O 

p4    CO* 

"*     10     CO     CO    Cl 

0    d 

CO     1*    CO 

b-    CO 

Cl       PH      d 

69  t& 

PH 

0      0 

^5   XO 

Ol    -P 

00    CO 

b-    d    CO 

PH      IO 

O    -f    Cl    -t    CO 

CO    b- 

d     CO     P" 

10    0 

-P    01    CO 

QB  91 

g    PH 

d    Tf 

iO    b- 

CO    O    PH 

CO    -r 

CO     b-    CO    O     PH 

CO     -P 

CO     b-    Cl 

O    Cl 

CO     -T     CO    1 

*  J      ^9 

a,  £, 

-w    <» 

Cl    00 

-f    O 

CO     d     CO 

-f    O 

CO     d     CO     -t    O 

CO    d 

00    t    o 

CO    d 

CO    -P    O 

S3 

£    "* 

CO    -t 

d   d 

d   co   co 

CO    xo 

co   co 

CO     CO     O 

co  eo   •* 

o 

0      0 

-w    ** 

IO    Cl 

0    b- 

"*    d    03 

b«    -f 

PH      Ci      CO      -t      PH 

CO    CO 

CO    PH    OO 

10  co 

O    CO    IO 

5 

2  S 

£~ 

CO    10 

t»    CO 

0    Cl    CO 

xO     b- 

Cl     O     Cl     -f     CO 

b-     Cl 

e?    eo    oa 

CO     $ 

O    PH    CO 

9)  (9 

CN     CM     74     tiM 

CN     d 

hi 

o    o 

-*J       ^ 

t^    CO 

XO     -f 

d    PH    0 

GO     b- 

CO     ^     CO     Cl     PH 

Cl    OO 

b-     XO     -P 

CC     f— 

O    Ci    QO 

91  <•> 

S    - 

CO    xo 

b.    01 

pH     CO     XO 

CO     GO 

O    d     1*     CO    CO 

CO    XO    b- 

Ci       I-H 

CO     -P     CO 

91  O 

d    d    d    d    d 

d  « 

T    T    ^ 

0      O 

«  o 

0    0 

O    0 

01    Cl    01 

01    03 

O3    Cl    Cl    Cl    Cl 

Cl    Cl 

00    CO    GO 

CO    00 

00    00    CO 

O  9 

g  ci 

T     CO 

QO    O 

PH    CO    xo 

b-    01 

IO     b-    Cl 

PH     CO 

xo    b-    Cl 

91  i* 

1—1 

m    M 

o    o 

.     PH 

Cl     CO 

-t    XO 

CO    b-    CO 

Cl    O 

PH    Cl    CO    ^    CO 

t^    QO 

Cl     O      PH 

d    CO 

"f    xo    CO 

00  91 

£« 

T     CO 

CO    O 

d     -T    CO 

CO      PH 

co   10   r^  ci   PH 

CO    iO 

b-    O    d 

t    CO 

CO    O    d 

•M  «* 

t^l 

CM    CN    CM     vj 

Cv     CQ 

o    o 

•    -M 

^    CO 

CO    O 

d  t  co 

CO    0 

CO    iO    b-    Ol    PH 

00    10 

b-    01    PH 

CO    XO 

t^     Ci      PH 

1    ** 

"*    CO 

GO    PH 

CO     XO     b- 

Cl    d 

d     d     Cl     CO     CO 

CO    CO 

S  5  -? 

CO    CO 
•"•P     T 

O    Cl    iO 
•O    IO    IO 

o     o 

^5    CO 

CO     Ci 

d    XO 

QO     PH     rti 

b-    O 

CO    XO    CO     PH     -t* 

b-    O 

CO     CO     Cl 

d    IO 

V.:       —       -f 

«  i* 

1    ^ 

Tf      CO 

Cl       PH 
PH 

CO    CO     CO 

O    CO 

d   d 

>O     b-    Ci    d    -* 

d  ci  d   co  co 

CO     CO 

PH     CO     iO 
•^     T     TF 

cc  o 

1"    xO 

Cl     iO    b- 

XO    xo    XO 

o    o 

-J    "* 

b*    PH 

xo  ci 

CO    CO    0 

"P    00 

i-     10    01     CO     CO 

O    M1 

CO    PH    xO 

01    CO 

CO    O    -P 

91  ft 

i<  ^ 

g  ci 
h 

I1    b- 

01      PH 

PH 

t    CO    01 

PH       CO 

d  d 

CO    00    O     CO     >0 
d    d    CO    CO    CO 

OO    O 

CO     -T 

C!     XO     b- 

f    -r    f 

3S 

-r    b-    01 
xo    XO    xo 

o    £. 

*5    ~f 

Ci     CO 

CO    d 

b-    PH    10 

0    -P 

Cl    CO    CO    d    CO 

—     IO 

0    -*    01 

CO    b- 

d      CO      PH 

O  O 

1   " 

Ci    d 

S      PH      S 

d   d 

d     d     CO     CO     CO 

co   -r 

PH      CO 

10    XO 

CO     CO     PH 
IO     XO     CO 

o 

•    IO 

O     xo 

O     XO 

O    XO    O 

iO    O 

XO    O    xo    O     XO 

0    XO 

O    xo    O 

10    0 

10    O     lO    1 

*  » 

g  ci 

PH 

XO     b- 

0    d 

XO    b«    O 

d     10 

d  d 

d     CO     CO     CO     CO 

0    d 

T     -1* 

10    b-    O 

-P      -T      XO 

ib   10 

b-    O    d 

XO     CO     CO 

0       ° 

«  'ra 

PH       CO 

d    b- 

CO    CO    CO 

01     -f 

O    iO    PH    CO    PH 

b-    Cl 

CO     CO     Cl 

-t    Ci 

xO    O    CO 

.«  g 

1  N 

IO    b- 

O    d 

2    PH"    d 

d     10 
Cl    d 

CO    O    CO    IO    OO 

d     CO     CO     CO     CO 

0    CO 
T     Tf 

>O     QO     O 
-P    -f    xo 

CO    XO 
IO    xo 

s  s  s 

o 

*;  *° 

PH    t» 

CO     Ol 

•^    O    CO 

d     b" 

co  01  10  o  co 

d    00 

CO    Cl     xo 

PH    CO 

Cl    CO    -* 

•^  ^ 

g    d 

IO     b- 

0    Cl 

IO    CO    O 

CO     XO 

CO    O     CO     CO    CO 

PH       CO 

CO    OO     PH 

-r    co 

ci    PH    -r 

QB 

Hj 

o    ° 

«  ^ 

d    CO 

-f    0 

CO    d    b- 

CO    Cl 

10    -H    |>    CO    01 

10       PH 

b-    CO    Cl 

IO     PH 

b-    (N    00 

<**  $ 

g   d 

P* 

XO    b« 

O    CO 

IO    CO    O 
PH      PH     d 

CO     XO 

d   d 

CO     PH     CO     CO     00 
d     CO    CO     CO    CO 

PH       -P 

CO     C5     -H 
T     -T     XO 

"t    l> 

XO    xo 

Cl    d    -P 

XO     CO     CO 

o 

^   <° 

d    CO 

"t    0 

0    d    00 

Tf     0 

CO    d    CO    -P    O 

CO    Cl 

CO    -P    O 

co  ci 

CO    -P    O 

®  i 

1  N 

XO    b- 

o   co 

PH     PH 

IO    CO    O 

PH      PH     Cl 

CO     CO 

d   d 

CO     —     CO     CO    Cl 
Cl     CO     CO     CO     CO 

Tt«   -r 

?3.g 

XO    XO 

O     Cl     IO 

10  co  co 

u 

ll°l 

|i 

d    07 

II 

ill 

0    0 
03     8 

§0000 
0     O     0     O 
o  o  o  o 
p-   ci   co    -r   10 

88 

o  o 

CO     b- 

888 

O     0    O 
GO     Cl    O 

o  o 

o  o 
o  o 

000 

< 

a 

I) 


47 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. GUYOT. 


a  S 


b 

°    S 


O 


H  » 


w  o 

n:1^ 

si 

H    S? 


S   cs: 
H   a 


w   ^ 

o:    O 


O 


O 


II 


7-1 


00 


i: 


®3 


I 


GO    *»   Q   «O   »   «   «   CO   C>-  fc*    «   C*    O>    t-    »»  W  O   CO    «D    tO    «•     «    OS    r*   i 

m  10  10  •  o  o  cs  «  c 


^i^i^^^ooi-i;oO'-'eO'Ti>i-;tf5MC>cor^t^-ti-*o-t|»ftOQ 
^t^Mcii.oi^co-r<Ncicoeo--coy5cO'-Hcit^>o-^cidcnco 
£.oio-p-T'-pcteoco<N<No4<N.-'~  "i-iooooooi-sci 


CO     W    <M    <M 


'NO<~-'f<MOOOS£—'1'NM^ 
<M    <M     -H     ~     ^     ^    <0     0    0    0    <^     0 


0    Cl    CS     W    O 


i>-eoo»w 

f^r- 


en  »o   ^  oo   10  cj  o   *>•  10  <w   o   cr>   >o   77   c^i  o   i^  co   ~f   c?   r-i   o 


c 


m  o  »o  o  10  o  »o  o  »o  o  o  o  10  o  10  o  »o  o  o  o  o  o  o  o  vn 


CO    CO    C5    C5    O    r-.    »-. 


0000    O.O 


n   01   CM  <N 


i-i     <N     -*     10     t-    X'    O     ^-     CO     >0    CO    CO    Ci     —     *M     —     tOt^Ci 
i-it-li-ir-(i-ir-i<NiM(M<M(MC^IMCOC'JCOCQCCC<5 


^    OS    0    W     W 


:II3 


D 


0000000000000000000(^000 
OOOOOOCDOOOOOOOOOOOOiOcr^OO 

ooooooooooooooooooooooo 


48 


III. 

TABLE 

FOR 

COMPUTING-  THE  DIFFERENCE  IN  THE  HEIGHTS  OF  TWO  PLACES  BY  MEANS  OF 

THE  BAROMETER. 

BY  PROF.  ELIAS  LOOMIS. 


THIS  table  was  computed  from  the  formula  of  Laplace,  modified  in  accordance 
with  the  results  of  more  recent  determinations. 
Suppose  that  we  have  observed 

T  H,  the  height  of  the  barometer, 
At  the  lower  station,  j  T,  the  temperature  of  the  barometer, 

'  £,    the  temperature  of  the  air, 

(  7i',  the  height  of  the  barometer, 
At  the  upper  station.  \  T',  the  temperature  of  the  barometer, 

'  £',    the  temperature  of  the  air. 

Represent  by  s  the  height  of  the  lower  station  above  the  level  of  the  sea,  by  L  the 
latitude  of  the  place,  and  by  h  the  observed  height  h1  reduced  to  the  temperature  T. 
The  difference  of  level  x  between  the  two  stations  is  given  by  the  formula, 


I  OH-'— 900  ) 

x  =  60158.  6  ft.  x  log.  ?  x  -{  (1  +  0.00265  cos.  2  L) 

I  /-i  !  a; +  52251   |     s   1 
I  V   »   20S88629   I  10444315; 

But  h  represents  the  height  h'  reduced  from  the  temperature  T'  to  the  temperature 
T.  The  expansion  of  mercury  for  1°  Fahr.  is  0.0001000  ;  that  of  the  brass  which 
forms  the  scale  of  the  barometer  is  0.0000104  ;  the  difference  is  0.0000896.  Hence 
we  have  h  =  h'  { 1  +  0.0000896  (T  —  T')  \. 

Therefore, 

60158.  6  ft.  log.  ~  =  60158.6  ft.  log.  5  _  2.3409  ft.  (T  —  T'). 

Part  I.  of  the  accompanying  Table  furnishes  in  English  feet  the  value  of  the  ex- 
pression 60158.6  log.  H  for  heights  of  the  barometer  from  11  to  31  inches;  only 
they  have  all  been  diminished  by  the  constant  27541.5  feet  which  does  not  change 
the  difference 

60158.6  log.  H  —  60158.6  log.  h. 

Part  II.  furnishes  the  correction  —  2.3409  (T  —  T')  depending  upon  the  differ- 
ence T  —  T'  of  the  temperatures  of  the  barometers  at  the  two  stations.     This  cor- 
D  49 


TABLE    FOR   COMPUTING    THE    DIFFERENCE    IN    THE    HEIGHTS 

rection  is  generally  negative.  It  would  be  positive  if  T  —  T'  were  negative  ;  that  is, 
if  the  temperature  T'  of  the  barometer  at  the  upper  station  exceeded  the  temperature 
T  at  the  lower  station. 

Part  III.  gives  the  correction  A  X  0.00265  cos.  2  L,  to  be  applied  to  the  approx- 
imate altitude  A,  and  which  arises  from  the  variation  of  gravity  from  the  latitude  of 
45  degrees,  to  the  latitude  L  of  the  place  of  observation.  This  correction  has  the 
same  sign  as  cos.  2  L ;  that  is,  it  is  positive  from  the  equator  to  45  degrees,  and  neg- 
ative from  45  degrees  to  the  pole. 

Part  IV.  gives  the  correction  A  X  ^JS^  wn^cn  ^s  always  to  be  added  to  the  ap- 
proximate height  A,  and  which  is  due  to  the  diminution  of  gravity  on  the  vertical. 

Part  V.  furnishes  for  the  approximate  difference  of  level  A  the  small  correction 
A  X  1G444315  corresponding  to  several  values  of  the  height  s  of  the  lower  station.  But 
in  place  of  s  there  has  been  substituted  as  the  argument  of  the  table,  the  height  H  of 
the  barometer  at  this  station. 

Method  of  Computation. 

Take  from  Part  I.  the  two  numbers  corresponding  to  the  observed  barometric 
heights  H  and  hf.  From  their  difference  subtract  the  correction  2.3409  (T  —  T') 
found  in  Part  II.  with  the  difference  T  —  T'  of  the  thermometers  attached  to  the  ba- 
rometers. We  thus  obtain  an  approximate  altitude  a. 

We  then  calculate  the  correction  a  ^~ —  for  the  temperature  of  the  air,  by  mul- 
tiplying the  nine-hundredth  part  of  a  by  the  sum  of  the  temperatures  t  and  t1  dimin- 
ished by  64.  This  correction  is  of  the  same  sign  as  t  -\-  t'  —  64.  We  thus  obtain 
a  second  approximate  altitude  A. 

With  A  and  the  latitude  of  the  place  L,  we  seek  in  Part  III.  the  correction  Ax 
0.00265  cos.  2  L  arising  from  the  variation  of  gravity  with  the  latitude. 

For  the  approximate  height  A,  Part  IV.  gives  the  correction  A  x  ^i^seS*  arising 
from  the  diminution  of  gravity  on  a  vertical.  This  correction  is  always  additive. 

Finally,  when  the  height  s  of  the  lower  station  is  considerable,  the  small  correc- 
tion A  X  mJ^s  may  be  found  in  Part  V.  This  correction  is  always  additive. 

Example  1. 

M.  Humboldt  made  the  following  observations  on  the  mountain  of  Guanaxuato,  in 
Mexico,  in  Latitude  21°,  viz. 

Upper  station.  Lower  station  near  the  sea. 

Thermometer  in  open  air,      t'  =  70°.3  t  =  77°.5 

Thermometer  to  barometer,  T7  =  70°.3  T  —  77°.5 

Barometer,  h'  =  23.66  H  =  30.046 

Required  the  difference  in  the  height  of  the  two  stations. 
D  50 


Part  I.  gives 


OF    TWO    PLACES    BY    MEANS    OF    THE    BAROMETER. 

for  H  =  30.046  inches 


for    h  =  23.66  inches 


Difference 
Part  II.  gives  for  T  —  T'  =  7°.2, 

Approximate  altitude  a, 
_?_  (t  +  ti  _  64)  =  6.918  x  83.8, 

Second  approximate  altitude  A, 
Part  III.  gives  for  A  =  6806,  and  L  =  21°, 
Part  IV.  gives  for  6806, 

Height  above  the  sea, 


27649.7 
21406.9 

6242.8 
—16.9 

6225.9 

+579.7 


6838.2  feet. 


Example  2. 

M.  Gay  Lussac  in  his  celebrated  balloon  ascent  in  1805,  found  his  barometer  to 
indicate  12.945  English  inches,  the  temperature  being  14°.9  Fahrenheit.  The  ba- 
rometer at  Paris  at  the  same  time  indicated  30.145  English  inches  with  a  tempera- 
ture of  87°. 44  Fahrenheit.  Required  the  elevation  of  the  balloon  above  Paris. 

(  for  H  =  30.145  inches,  27735.6 

!S  (  for  h'  =  12.945  inches,  5650.4 

Difference,  22085.2 

Part  II.  gives  for  T  —  T'  =  72°.54,  —169.9 

Approximate  altitude  a,  21915.3 

ggL  (t  +  t'  —  64)  =  24.35  x  38.34,  +933.6 

Second  approximate  altitude  A,  22848.9 

Part  III.  gives  for  A  =  22848,  and  L  =  48°  50'  —8.2 

Part  IV.  gives  for  22848,  +82.1 

Height  of  balloon  above  Paris,  22922.8  feet. 


51 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS, 


PART  I. 

Argument,  the  observed  Height  of  the  Barometer  at  either  Station, 

Inches. 

Feet. 

Diff. 

Inches. 

Feet. 

Diff. 

Inches. 

Feet.    Diff. 

Inches. 

Feet. 

Diff. 

11.0 

1396.9 

16.0 

11186.3 

21.0 

18291.0 

26.0 

23871.0 

236.4 

162.8 

124.1 

100.3 

11.1 

1633.3 

16.1 

11349.1 

21.1 

18415.1 

26.1 

23971-3 

234.3 

161.8 

123.6 

99.9 

11.2 

1867.6 

16.2 

11510.9 

21.2 

18538.7 

26.2 

24071.2 

11.3 

2099.9 

232.3 

16.3 

11671.7 

160.8 

21.3 

18661.6 

122.9 

26.3 

24170.7 

99.5 

230.2 

159.8 

122.4 

99.1 

11.4 
11.5 

2330.1 
2558.3 

228.2 

16.4 
16.5 

11831.5 

11990.3 

158.8 

21.4 
21.5 

18784.0 
18905.8 

121.8 

26.4 
26.5 

24269.8 
24368.6 

98.8 

11.6 

2784.5 

226.2 

16.6 

12148.2 

157.9 

21.6 

19027.0 

121.2 

26.6 

24467.0 

98.4 

224.2 

156.9 

120.7 

98.1 

11.7 
11.8 

3008.7 
3231.1 

222.4 

16.7 
16.8 

12305.1 
12461.0 

155.9 

21.7 
21.8 

19147.7 
19267.8 

120.1 

26.7 

26.8 

24565.1 
24662.7 

97.6 

11.9 

3451.6 

220.5 

16.9 

12616.1 

155.1 

21.9 

19387.4 

119.6 

26.9 

24760.0 

97.3 

12.0 

3670.2 

218.6 

17.0 

12770.2 

154.1 

22.0 

19506.4 

119.0 

27.0 

24857.0 

97.0 

216.8 

153.3 

118.5 

96.6 

12.1 

3887.0 

17.1 

12923.5 

22.1 

19624.9 

27.1 

24953.6 

12.2 

4102.0 

215.0 

17-2 

13075-8 

152.3 

22.2 

19742.9 

118.0 

27.2 

25049.8 

96.2 

213.3 

151«5 

117.4 

95.9 

12.3 

5315.3 

17.3 

13227-3 

22.3 

19860.3 

27.3 

25145.7 

211.6 

150-6 

116.9 

95.5 

12.4 

4526.9 

17.4 

13377.9 

22.4 

19977.2 

27.4 

25241.2 

12.5 

4736.7 

209.8 

17.5 

13527-6 

149.7 

22.5 

20093.6 

116.4 

27.5 

25336.4 

95.2 

12.6 

4944.9 

208.2 

17.6 

13676.5 

148.9 

22.6 

20209.4 

115.8 

27.6 

25431.2 

94.8 

206.5 

148.0 

115.4 

94.5 

12.7 

5151.4 

17.7 

13824.5 

22.7 

20324.8 

27.7 

25525.7 

12.8 

5356.4 

205.0 

17.8 

13971.7 

147.2 

22.8 

20439.6 

114.8 

27.8 

25619.9 

94.2 

12.9 

5559.7 

203.3 
201.7 

17.9 

14118.0 

146.3 
145.6 

22.9 

20554.0 

114-4 
113.8 

27.9 

25713.7 

93.8 
93.4 

13.0 
13.1 
13.2 

5761.4 
5961.6 
6160.3 

200.2 
198.7 

18.0 
18.1 
18.2 

14263.6 
14408.3 
14552.3 

144.7 
144.0 

23.0 
23.1 
23.2 

20667.8 
20781.1 
20894.0 

113.3 
112.9 

28.0 
28.1 

28.2, 

25807.1 
25900.3 
25993.1 

93.2 

92.8 

13.3 

6357.5 

197.2 

18.3 

14695.4 

143.1 

23.3 

21006.4 

112.4 

28.3 

26085.6 

92.5 

13.4 
13.5 

6553.2 
6747.5 

195.7 
194.3 

18.4 
18.5 

14837.8 
14979.4 

142.4 
141.6 

23.4 
23.5 

21118.3 
21229.7 

111.9 
111.4 

28.4 

28.5 

26177.7 
26269.6 

92.1 
91.9 

13.6 

6940.3 

192.8 

18.6 

15120.3 

140.9 

23.6 

21340.6 

110.9 

28.6 

26361.1 

91.5 

13.7 
13.8 
13.9 
14.0 

7131.7 
7321.7 
7510.3 
7697.6 

191.4 
190.0 
188.6 
187.3 

18.7 

18.8 
18.9 
19.0 

15260.3 
15399-7 
15538-3 
15676-2 

140.0 
139.4 
138.6 
137.9 

23.7 
23.8 
23.9 
24.0 

21451.1 
21561.1 
21670.6 
21779.7 

110.5 
110-0 
109.5 
109.1 

28.7 
28.8 
28.9 
29.0 

26452.3 
26543.2 
26633.7 
26724.0 

91.2 
90.9 
90.5 
90.3 

14.1 

7883.6 

186.0 
184.6 

19.1 

15813-3 

137.1 
136.5 

24.1 

21888.4 

108.7 
108.2 

29.1 

26813.9 

89.9 
89.6 

14.2 
14.3 

8068.2 
8251.5 

183.3 

19.2 
19.3 

15949-8 
16085-5 

135.7 

24.2 
24.3 

21996.6 
22104.3 

107.7 

29.2 
29.3 

26903.5 
26992.8 

89.3 

14.4 

8433.6 

182.1 

180.8 

19.4 

16220-5 

135.0 
134.3 

24.4 

22211.6 

107.3 
106.8 

29.4 

27081.9 

89.1 

88.7 

14.5 
14.6 
14.7 
14.8 
14.9 

8614.4 
8794.0 
8972.3 
9149.5 
9325.5 

179.6 
178.3 
177.2 
176.0 

19.5 
19.6 
19.7 
19.8 
19.9 

16354-8 
16488-5 
16621-4 
16753-7 
16885-3 

133.7 
132.9 
132.3 
131.6 

24.5 
24.6 
24.7 
24.8 
24.9 

22318.4 
22424.8 
22530.8 
22636.4 
22741.5 

106.4 
106.0 
105.6 
105.1 

29.5 
29.6 
29.7 
29.8 
29.9 

27170.6 
27259.0 
27347.1 
27434.9 
27522.5 

88.4 
88.1 
87.8 
87.6 

15.0 
15.1 

9500.3 
9673.8 

174.8 
173.5 

20.0 
20.1 

17016-3 
17146-6 

131.0 
130.3 

25.0 
25.1 

22846.3 
22950.6 

104.8 
104.3 

30.0 
30.1 

27609.7 
27696.6 

87.2 
86.9 

172.4 

129.7 

103.8 

86.7 

15.2 

9846.2 

20.2 

17276-3 

25.2 

23054.4 

30.2 

27783.3 

171.3 

129.0 

103.5 

86.4 

15.3 
15.4 

10017.5 
10187.7 

170.2 

20.3 
20.4 

17405-3 
17533-7 

128.4 

25.3 
25.4 

23157.9 
23261.0 

103.1 

30-3 
30-4 

27869.7 
27955.7 

86.0 

169.1 

127.7 

102.6 

85.8 

15.5 

10356.8 

168.0 

20.5 

17661-4 

127.2 

25.5 

23363.6 

102.3 

30.5 

28041.5 

85.6 

15.6 

10524.8 

20.6 

17788-6 

25.6 

23465.9 

30.6 

28127.1 

15.7 

10691.8 

167.0 
165.9 

20.7 

17915-1 

126.5 
125.9 

25.7 

23567.7 

101.8 
101.5 

30.7 

28212.3 

85.2 
85.0 

15.8 
15.9 

10857.7 
11022.5 

164.8 

20.8 
20.9 

18041-0 
18166-3 

125.3 

25.8 
25.9 

23669.2 
23770.3 

101.1 

30.8 
30.9 

28297.3 

28382.0 

84.7 

16.0 

11186.3 

163.8 

21.0 

18291-0 

124.7 

26.0 

23871.0 

100.7 

31.0 

28466.4 

84.4 

I) 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 


PART  II. 

Correction  due  to  T  —  T',  or  the  Difference  of  the  Temperatures  of  the  Barometers  at  the  two  Stations. 

Tliis  Correction  is  Negative  when  the  Temperature  at  the 

Upper  Station  is  loivest,  and  vice  verst. 

:       T  —  T'. 

Correc- 
tion. 

T  —  T'. 

Correc- 
tion. 

T  —  T'. 

Correc- 
tion. 

T  —  T'. 

Correc- 
tion. 

T  —  T'. 

Correc- 
tion. 

T  —  T'. 

Correc- 
tion. 

Fah't. 

Feet. 

Fah't. 

Feet. 

Fah't. 

Feet. 

Fah't. 

Feet. 

Faht. 

Feet. 

Fah't. 

Feet. 

0 

o 

o 

0 

o 

o 

1 

2.3 

14 

32.8 

27 

63.2 

40 

93.6 

53 

124.1 

66 

154.5 

2 

4.7 

15 

35.1 

28 

65.5 

41 

96.0 

54 

126.4 

67 

156.8 

3 

7.0 

16 

37.5 

29 

67.9 

42 

98.3 

55 

128.7 

68 

159.2 

4 

9.4 

17 

39.8 

30 

70.2 

43 

100.7 

56 

131.1 

69 

161.5 

5 

11.7 

18 

42.1 

31 

72.6 

44 

103.0 

57 

133.4 

70 

163.9 

6 

14.0 

19 

44.5 

32 

74.9 

45 

105.3 

58 

135.8 

71 

166.2 

7 

16.4 

20 

46.8 

33 

77.3 

46 

107.7 

59 

138.1 

72 

168.6 

8 

18.7 

21 

49.2 

34 

79.6 

47 

110.0 

60 

140.4 

73 

170.9 

9 

21.1 

22 

51.5 

35 

81.9 

48 

112.4 

61 

142.8 

74 

173.3 

10 

23.4 

23 

53.8 

36 

84.3 

49 

114.7 

62 

145.1 

75 

175.6 

11 

25.8 

24 

56.2 

37 

86.6 

50 

117.0 

63 

147.5 

76 

177.9 

12 

28.1 

25 

58.5 

38 

89.0 

51 

119.4 

64 

149.8 

77 

180.3 

13 

30.4 

26 

60.9 

39 

91.3 

52 

121.7 

65 

152.2 

78 

182.6 

PART  III. 

Correction  due  to  the  Change  of  Grav- 

PART 
IV. 

PART   V. 

ity  from  the  Latitude  of  45o  to  the 
Latitude  of  the  Place  of  Observation. 

Correction 

Correction  due  to  the  Height  of  the  Lower 
Station. 

Positive  from  Lot.  0°  to  45o  ; 
Negative  from  Lot,  45o  to  90°. 

for 
Decrease 
of  Gravity 

Always  Positive. 

Latitude. 

on  a 

. 

00 

100 

200 

30o 

400 

Vertical. 

Height  of  Barometer  at  Lower  Station. 

App. 
Alt. 

90o 

80o 

70o 

60o 

500 

45° 

Always 
Positive. 

16  in. 

18  in. 

20  in. 

22  in. 

24  in. 

26  in. 

28  in. 

App- 
Alt. 

Feet. 

Feet. 

Feet. 

Feet. 

Feet. 

Feet. 

Feet. 

Feet. 

Feet. 

Feet. 

Feet. 

Feet. 

Feet. 

Feet. 

Feet. 

Feet. 

1000 

2.6 

2.5 

2.0 

1.3 

0.5 

0 

2. 

5 

1.6 

1.3 

1.0 

0 

.8 

0.6 

0.4 

0.2 

1000 

2000 

5.3 

5.0 

4.1 

2.6 

0.9 

0 

5.2 

3 

.1 

2.5 

2.0 

1 

.5 

1.1 

0.7 

0.3 

2000 

3000 

7.9 

7.5 

6.1 

4:0 

] 

1.4 

0 

7.9 

4.7 

3.8 

3.0 

2 

.3 

1.7 

1.1 

0 

5 

3000 

4000 

10.6 

10.0 

8.1 

5.3 

1.8 

0 

10.1 

3 

6 

.3 

5.1 

4.0 

3 

.1 

2.2 

1.4 

0.7 

4000 

5000 

13.2 

12.4 

10.1 

6.6 

2.3 

0 

13.7 

7.8 

6.4 

5.0 

3 

.8 

2.8 

1.8 

0 

S 

5000 

6000 

15.9 

14.9 

12.2 

7.9 

2.8 

0 

16.7 

9 

.4 

7.6 

6.0 

4 

.6 

3.3 

2.1 

1 

0 

6000 

7000 

18.5 

17.4 

14.2 

9.3 

3.2 

0 

19.9 

11.0 

8.9 

7. 

5 

.4 

3.9 

2.5 

1 

2 

7000 

8000 

21.2 

19.9 

16.2 

10.6 

3.7 

0 

23.1 

12 

.5 

10.2 

8. 

6 

.2 

4.4 

2.8 

1 

'3 

8000 

9000 

23.8 

22.4 

18.3 

11.9 

4.1 

0 

26.4 

14 

.1 

11.4 

9. 

6 

.9 

5.0 

3.2 

1 

5 

9000 

10000 

26.5 

24.9 

20.3 

13.2 

4.6 

0 

29.8 

15 

.7 

12.7 

10. 

7 

.7 

5.5 

3.5 

1.7 

10000 

11000 

29.1 

27.4 

22.3 

14.6 

5.1 

0 

33.3 

17 

.2 

14.0 

11. 

8 

.5 

6.1 

3.9 

1 

8 

11000 

12000 

31.8 

29.9 

24.4 

15.9 

5.5 

0 

36.< 

) 

18 

.8 

15.3 

12. 

9 

.2 

6.6 

4.2 

2 

0 

12000 

13000 

34.4 

32.4 

26.4 

17.2 

6.0 

0 

40.6 

20 

.4 

16.5 

13. 

10 

.0 

7.2 

4.6 

2 

2 

13000 

14000 

37.1 

34.9 

28.4 

18.5 

6.4 

0 

44.4 

21.9 

17.8 

14. 

10 

.8 

7.7 

4.9 

2 

:3 

14000 

15000 

39.7 

37.3 

30.4 

19.9 

6.9 

0 

48.3 

23 

.5 

19.1 

15. 

11 

.5 

8.3 

5.3 

2 

5 

15000 

16000 

42.4 

39.8 

32.5 

21.2 

7.4 

0 

52.3 

25 

.1 

20.3 

16. 

12 

.3 

8.8 

5.6 

2 

7 

16000 

17000 

45.0 

42.3 

34.5 

22.5 

7.8 

0 

56.4 

26.6 

21.6 

17. 

13 

.1 

9.4 

6.0 

2 

8 

17000 

18000 

47.7 

44.8 

36.5 

23.8 

8.3 

0 

60.5 

28.2 

22.9 

18. 

13 

.8 

9.9 

6.3 

3 

0 

18000 

19000 

50.3 

47.3 

38.6 

25.2 

8.7 

0 

64.8 

29.8 

24.1 

19.2 

14 

.6 

10.5 

6.7 

3 

.2 

19000 

20000 

53.0 

49.8 

40.6 

26.5 

9.2 

0 

69.2 

31 

3 

25.4 

20.2 

15 

.4 

11.0 

7.0 

3 

.3 

20000 

21000 

55.6 

52.3 

42.6 

27.8 

9.7 

0 

73.6 

32.9 

26.7 

21.2 

16 

.1 

11.6 

7.4 

3.5 

21000 

22000 

58.3 

54.8 

44.7 

29.1 

10.1 

0 

78.2 

34.5 

28.0 

22.2 

16 

.9 

12.1 

7.7 

3 

7 

22000 

23000 

60.9 

57.3 

46.7 

30.5 

10.6 

0 

82.9 

36.0 

29.2 

23.2 

17 

.7 

12.7 

8.1 

3 

8 

23000 

24000 

63.6 

59.8 

48.7 

31.8 

lljO 

0 

87.6 

37.6 

30.5 

24.2 

18 

.5 

13.2 

8.4 

4 

0 

24000 

25000 

66.2 

62.2 

50.7  33.1 

11.5 

0 

92.5 

39.1 

31.8 

25.2 

19 

.2 

13.8 

8.8 

4 

1 

25000 

D 


53 


IV. 

TABLES 

FOR  REDUCING  BAROMETRICAL  OBSERVATIONS  TO  THE  LEVEL  OF  THE  SEA,  OR  TO  ANY 
OTHER  LEVEL,  AND  FOR  COMPUTING  DIFFERENCES  OF  ELEVATION  MEASURED  BY  THE 
BAROMETER,  BY  M.  C.  DIPPE. 

THE  following  tables,  published  by  M.  C.  DIPPE,  in  the  Astronomische  Nachrichten, 
No.  1056,  November,  1856,  are  a  modification  and  extension  of  Gauss's  tables, 
published  in  Schumacher's  Jahrbuch,  for  1836  and  the  following  years,  which  are 
based  on  the  formula  of  Laplace.  In  this  new  form  they  answer  a  double  purpose. 
They  give  the  means  of  solving  a  problem  which  often  occurs  in  Meteorology,  viz. : 
The  difference  of  elevation  between  two  stations,  and  the  temperature  of  the  air  at 
both,  being  known,  to  reduce  the  height  of  the  barometer  at  one  of  the  stations  to  the 
height  it  would  have  at  the  other.  They  are  likewise  adapted  to  the  computation  of 
heights  from  barometrical  observations. 

The  formula  of  Laplace,  which  has  been  used,  the  Metres  being  reduced  to  Toises, 
and  the  Centigrade  degrees  to  degrees  of  Reaumur,  reads  as  follows : 

h  =  9407.73  (l  + '+/)  (1  +  «  cos  2  0)  (l  +  J)  j log  b-  +  2  log  (l  +  J) {  . 

Where  t  and  t'  =  the  temperatures  of  the  air,  in  degrees  of  Reaumur,  at  the  lower 

and  upper  station, 
b  and  I'  =  the  height  of  the  barometer,  in  any  scale,  reduced  to  the  freezing 

point,  at  the  lower  and  upper  station, 

h  =  the  difference  of  level,  in  toises,  between  the  two  stations, 
r  =  the  distance,  in  toises,  of  the  lower  station  to  the  centre   of  the 

Earth, 

<£  =  the  latitude  of  the  place  of  observation, 
a  =  the  increase  of  gravity  from  the  equator  to  the  poles. 

Making,  besides,  m  =  the  modulus  of  the  common  logarithms,  the  formula  be- 
comes,  with  sufficient  accuracy, 

.    (       1  1  2m  1  1 

=  H      9407.73  ' 


Assuming  r,  or  the  radius  of  the  Earth,  at  45°  latitude  =  3266631  toises,  and 
a  =  0.002595,  instead  of  0.002845  adopted  in  Gauss's  tables,  and  making 

u  =  log  b  —  log  Z>', 

1  1  _  2m\ 

1773*-.     i    t  +  t1        '     T    /' 
'<-<o      1  _L  _T__  r   / 


a  =  lo 

c  =  —  m  a  cos  a 
;  m  h 


then  the  reduction  of  the  height  of  the  barometer  to  another  level  is  given  by  the 
formula, 

D  54 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  2 

1.  log  u  =  log  h  +  a  +  c  +  c1 ; 

2.  log  b  =  log  J'  +  u. 

Table  I.  contains  the  values  of  a  for  the  argument  t  -f- 1' ;  10  units  are  to  be  sub- 
tracted from  the  characteristic. 

Table  II.  gives  the  values  of  c  for  the  argument  $,  or  the  correction  for  the 
change  of  gravity  in  latitude,  which  is  negative  from  0°  to  45°,  positive  from  45° 
to  90°. 

Table  III.  furnishes  the  values  of  c'  for  the  argument  h  in  toises,  or  the  correction 
for  the  decrease  of  gravity  on  the  vertical.  Both  in  Tables  II.  and  III.  the  values  of 
c  and  c'  are  given  in  units  of  the  fifth  decimal  place. 

The  difference  of  elevation  of  the  two  stations  is  given  by  the  formula, 

1.  u  =  log  b  —  log  &', 

2.  log  h  =  log  u  +  A  +  c  +  c', 

in  which  A  is  the  arithmetical  complement  of  a,  and  the  corrections  c  and  c'  receive 
contrary  signs.  For  the  sake  of  convenience,  the  values  of  A  have  been  placed  in 
Table  I.,  and  in  Table  III.  the  correction  for  A  is  found  in  another  column,  with  the 
more  convenient  argument  v  =  log  u  -\-  A. 

If  the  heights  of  the  barometers  have  not  been  reduced  to  the  freezing  point,  then, 
B  and  B'  being  the  unreduced  heights  of  the  barometers,  and  T  and  T'  the  temper- 
ature of  the  attached  thermometer  in  degrees  of  Reaumur, 

B  B' 


and  making  ^^  =  0, 

u  =  log  b  —  log  V  =  (log  B  —  0T)  —  (log  B'  —  0  T). 
Instead  of  /3  =  0.000098,  we  can  write  with  sufficient  accuracy  0.00010. 

USE  OF  THE  TABLES. 

These  tables  can  be  used  in  any  latitude,  and  for  any  barometrical  scale  ;  but  the 
indications  of  the  barometers  must  be  reduced  to  the  freezing  point ;  and  the  tem- 
peratures of  the  air  must  be  given  in  degrees  of  Reaumur.  The  tables  suppose  the 
use  of  logarithms  with  5  decimals,  such  as  those  of  Lalande,  and  give  the  results 
in  toises. 

I.     For  Reducing  Barometrical  Observations  to  another  Level. 

Given  h  in  toises,  t,  t',  $,  and  b  or  b'. 
To  find  b  or  b1. 

In  Table  I.  with  the  argument  t  -f-  t',  take  a, 
In  Table  II.  with  the  argument  <£,  take  c, 
In  Table  III.  with  the  argument  7i,  take  c', 

the  last  two  corrections  being  given  in  units  of  the  fifth  decimal,  making 

log  h  -f-  a  -f-  c  -\-  c'  —  10  (whole  units)  =  log  u. 
Then  we  have 

for  a  level  lower  by  h  toises,  log  b   —  log  b'  -\-  u ; 
for  a  level  higher  by  h  toises,  log  b'  =  log  b  —  u. 

If  /»,  or  the  difference  of  elevation,  is  given  in  metres,  take  c',  which  is  always 
negative,  from  Table  III.  (for  A)  with  the  argument  v  =  log  h  +  9.71,  and  write 

log  u  =  9.71018  +  log  h  +  a  +  c  +  c'  —  10  (whole  units). 
Then  again  is  log  b  =  log  b'  -j-  u. 

D  55 


3  BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

Example  1. 

Suppose  the  height  of  the  barometer,  reduced  to  the  freezing  point,  to  be  I'  = 
295.39  Paris  lines;  the  temperature  of  the  air  t'  =  11°. 8  Reaumur,  and  the  latitude 
$  =  51°  48';  the  increase  of  heat  downwards  being  1°  Reaumur  for  100  toises. 
What  is  the  height  of  the  barometer,  reduced  to  the  freezing  point,  at  a  station 
lower  by  h  =  498.2  toises  ? 

In  th*    case  t  =  t'  -J-  4°.98  ==  16°.78,  and  t  +  t'  =  28°.58. 
Then 

log  h  —       2.69740 

Table  I.  for  28°.58  gives  a  =        5.99538 

Table  II.  for  51°  48'  gives        c  =  +  0.00026 
Table  III.  for  498  toises  gives  c1  —  T-  0.00007 

log  u  =       8.69297  —  10 

u  =        0.04931 
log  b'  =       2.47040 

log  b  =       2.51971 
Barometer  at  the  lower  station  b  =        330.90  Paris  lines. 

Example  2. 

Suppose  the  reduced  barometer  b'  =  598.6  millimetres  ;  the  temperature  of  the 
air  t1  —  18° .0  Centigrade  =  14°.4  Reaumur ;  the  difference  of  elevation  h  =  2217 
metres ;  <£  —  3°.  The  temperature  of  the  air  at  the  lower  station  t  =  27°. 5  Cen- 
tigrade =  22°.0  Reaumur,  and  t  +  t1  =  36°  .4  Reaumur. 

rp,  i      ;,        5  log  2217  =        3.34577 

=  |  +        9.71018 

3.05595     v  ==  3.06 
a  =        5.98750 
c  =  _  0.00112 
c'  =  —  0.00015 

log  u  =       9.04218  —  10 

u  =       0.11020 
log  b'  =       9.77714 

log  b  =       9.88734 
Barometer  at  the  lower  station  b  =       771.5  millimetres. 


2.     For  Computing  Differences  of  Elevation  from  Barometrical  Observations. 

Given  the  unreduced  height  of  the  barometer  at  the  lower  and  upper  station, 
B  and  B' ;  the  temperatures  of  the  attached  thermometers,  T  and  T' ;  the  temperatures 
of  the  air,  t  and  t1 ;  and  the  latitude,  <£. 

To  find  7i,  or  the  difference  of  elevation  between  the  two  stations. 

Subtract  (log  B'  —  10  T')  from  (log  B —  10  T),  paying  due  attention  to  the 
nature  of  the  signs  of  T  and  T',  and  taking  the  numbers  10  T  and  10  Tx  as  units  of 
the  fifth  decimal.  Calling  then  (log  B  —  10  T)  —  (log  B'  —  10  T')  =  w,  or  if  the 
heights  of  the  Barometers  are  reduced  to  the  freezing  point,  log  b  —  log  b'  =  w, 
take, 

In  Table  I.,  A  with  the  argument  t  -f-  /',  and  make  v  =  log  u  -|~  A. 
In  Table  II.,  with  the  argument  $,  take  c  reversing  the  sign. 
D  56 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  4 

In  Tabte  III.,  for  A,  with  the  argument  0,  take  c',  which,  in  this  case,  is  always 
positive  ;  then,  remembering  that  the  values  of  c  and  cf  are  given  in  units  of  the 
fifth  decimal,  we  have, 

v  +  c  -\-  c'  =  log  h  in  toises, 

v  +  c  +  c'  +  0.28982  ==  log  h  in  metres, 

v  +  c  +  c/  +  0.80584  =  log  7t  in  English  feet. 

Example  1. 

L.  station  B  =  329.013  Paris  lines  ;  T  =  +15.88  R. ;  t  —  +  15.96  R. ;  <j>  =  45  32. 
U.  station  B'  =  268.215  Paris  lines  ;  T'  =  +  8.40  R. ;  t  =  +    7.92  R. 

t  +  t'  =       23.88  R. 

log  B  =  2.51722  —  10  x  15.88  =   2.51563 
log  B'  =  2.42848  —  10  x  8.4  =   2.42764 

u  =   0.08799 

log  u  =   8.94443 

A  =   3.99982 

v  —  2.94425 
c  =  —  0.00002 
c'  =  +  0.00012 

log  h  =       2.94435 

h  =        879.74  toises. 

Example  2. 

L.  station  B  —  763.15  millimetres ;  T  =  t  —  25.3  Cent.  =  20.24  R. ;  <£  =  21. 
U.  station  B7  =  600.95  millimetres  ;  T'  =  t1  =  21.3  Cent.  =  17.04  R. 

t  +  t'  =  37.28  R. 

log  B  =  9.88261  —  10  x  20.24  =        9.88059 
log  B'  =  9.77884  —  10  x  17.04  =       9.77714 

u  —       0.10345 

logw  =       9.01473 

A=       4.01337 

v  =       3.02810 

c  =  +  0.00084 
c'  =  +  0.00014 

log  h  =       3.02908  for  toises. 
0.28982 

log  h  —        3.31890  for  metres, 
log  h  =        3.02908  for  toises. 
0.30584 

log  h  =       3.83492  for  English  feet. 
h  =  1069.3  toises  =  2084.0  metres  —  6837.9  English  feet. 


D  57 


1  BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. DIPPE. 

I.    ARGUMENT  :    SUM  OF  THE  TEMPERATURES  OF  THE  AIR  IN  DEGREES  OF  REAUMUR. 


t+f 

Reaumur. 

Correction  for 

i+t 

Reaumur. 

,         Correction  for 

a 

Difference. 

A 

a 

Difference. 

A 

-60° 

6.09617 

3.90383 

-20° 

6.04776 

3.95224 

-59 

6.09489 

128 

3.90511 

-19 

6.04661 

115 

3.95339 

-58 

6.09362 

127 

3.90638 

-18 

6.04547 

114 

3.95453 

-57 

6.09235 

127 

3.90765 

-17 

6.04434 

113 

3.95566 

-56 

6.09108 

127 

3.90892 

-16 

6.04320 

114 

3.95680 

126 

113 

-55 

6.08982 

3.91018 

-15 

6.04207 

3.95793 

-54 

6.08856 

126 

3.91144 

-14 

6.04094 

113 

3.95906 

-53 

6.08730 

126 

3.91270 

-13 

6.03981 

113 

3.96019 

-52 

6.08605 

125 

3.91395 

-12 

6.03869 

112 

3.96131 

-51 

6.08480 

125 

3.91520 

-11 

6.03757 

112 

3.96243 

124 

112 

-50 

6.08356 

3.91644 

-10 

6.03645 

3.96355 

-49 

6.08231 

125 

3.91769 

-  9 

6.03533 

112 

3.96467 

-48 

6.08108 

123 

3.91892 

-  8 

6.03422 

111 

3.96578 

-47 

6.07984 

124 

3.92016 

-  7 

6.03311 

111 

3.96689 

-46 

6.07861 

123 

3.92139 

-  6 

6.03201 

110 

3.96799 

123 

111 

-45 

6.07738 

3.92262 

-  5 

6.03090 

3.96910 

-44 

6.07616 

122 

3.92384 

-  4 

6.02980 

110 

3.97020 

-13 

6.07494 

122 

3.92506 

-  3 

6.02871 

109 

3.97129 

-42 

6.07372 

122 

3.92628 

-  2 

6.02761 

110 

3.97239 

-41 

6.07250 

122 

3.92750 

-  1 

6.02652 

109 

3.97348 

121 

109 

-40 

6.07129 

3.92871 

0 

6.02543 

3.97457 

-39 

6.07009 

120 

3.92991 

+  1 

6.02434 

109 

3.97566 

-38 

6.06888 

121 

3.93112 

2 

6.02326 

10S 

3.97674 

-37 

6.06768 

120 

3.93232 

3 

6.02217 

109 

3.97783 

-36 

6.06648 

120 

3.93352 

4 

6.02109 

108 

3.97891 

119 

107 

—35 

6.06529 

3.93471 

5 

6.02002 

3.97998 

-34 

6.06410 

119 

3.93590 

6 

6.01895 

107 

3.98105 

-33 

6.06291 

119 

3.93709 

7 

6.01787 

108 

3.98213 

-32 

6.06173 

118 

3.93S27 

8 

6.01680 

107 

3  98320 

-31 

6.06055 

118 

3.93945 

9 

6.01574 

106 

3.98426 

118 

106 

-30 

6.05937 

3.9-1063 

10 

6.01468 

3.98532 

-29 

6.05819 

118 

3.94181 

11 

6.01362 

106 

3.98638 

-28 

6.05702 

117 

3.94298 

12 

6.01256 

106 

3.98744 

-27 

6.05585 

117 

3.94415 

13 

6.01150 

106 

3.98S50 

-26 

6.05469, 

116 

3.94531 

14 

6.01045 

105 

3.98955 

117 

105 

-25 

6.05352 

3.94648 

15 

6.00940 

3.99060 

-24 

6.05236 

116 

3.94764 

16 

6.00835 

105 

3.99165 

-23 

6.05121 

115 

3.94879 

17 

6.00731 

104 

3.99269 

-22 

6.05005 

116 

3.94995 

18 

6.00626 

105 

3.99374 

-21 

6.04890 

115 

3.95110 

19 

6.00522 

104 

3.99478 

-20 

6.04776 

114 

3.95224 

+20 

6.00418 

104 

3.99582 

D 


58 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. DIPPE. 

( Continued.) 


Correction  for 

Correction  for 

t+t 

f+f 

Reaumur. 

a 

Difference. 

A           i 

leaumur. 

a 

Difference. 

A 

+20° 

6.00418 

3.99582 

+40° 

5.98393 

4.01607 

21 

6.00315 

103 

3.99685 

41 

5.98294 

99 

4.01706 

103 

99 

22 

6.00212 

3.99788 

42 

5.98195 

4.01805 

23 

6^00108 

104 

3.99892 

43 

5.98097 

98 

4.01903 

24 

6-00006 

102 

3.99994 

44 

5.97998 

99 

4.02002 

103 

98 

25 

5.99903 

4.00097 

45 

5.97900 

4.02100 

26 

5.99801 

102 

4.00199 

46 

5.97803 

97 

4.02197 

27 

5.99699 

102 

4.00301 

47 

5.97705 

98 

4.02295 

28 

5.99597 

102 

4.00403 

48 

5.97608 

97 

4.02392 

29 

5.99495 

102 

4.00505 

49 

5.97511 

97 

4.02489 

101 

97 

30 

5.99394 

4.00606 

50 

5.97414 

4.02586 

31 

5.99293 

101 

4.00707 

51 

5.97317 

97 

4.02683 

32 

5.99192 

101 

4.00808 

52 

5.97221 

96 

4.02779 

33 

5.99091 

101 

4.00909 

53 

5.97124 

97 

4.02876 

34 

5.98991 

100 

4.01009 

54 

5.97028 

96 

4.02972 

101 

95 

35 

5.98890 

4.01110 

55 

5.96933 

4.03067 

36 

5.98790 

100 

4.01210 

56 

5.96837 

96 

4.03163 

37 

5.98691 

99 

4.01309 

57 

5.96742 

95 

4.03258 

38 

5.98591 

100 

4.01409 

58 

5.96646 

96 

4.03354 

39 

5.98492 

99 

4.01508 

59 

5.96551 

95 

4.03449 

II.     LATITUDE.  —  CORRECTION  FOR  a. 

III.    DECREASE  OF  GRAVITY  ON  THE 
VERTICAL.  —  CORRECTION 

For  A  reverse  the  Signs  of  c. 

For  a,  argument  A,  in  Toises, 
c'  always  Negative. 

For  A,  arg.  v, 
c1  always  Positive. 

* 

c 

* 

+ 

c 

t> 

t> 

c 

* 

h 

c 

h 

c' 

V 

c 

o 
0 

-113+ 

0 

90 

o 
15 

-98+ 

o 
75 

0 

30 

-56+ 

o 
60 

100 

1 

1600 

21 

1.8 

1 

1 

113 

89 

16 

96 

74 

31 

53 

59 

200 

3 

1700 

23 

1.9 

1 

2 

112 

88 

17 

93 

73 

32 

49 

58 

300 

4 

1800 

24 

2.0 

1 

3 

112 

87 

18 

91 

72 

33 

46 

57 

400 

5 

1900 

25 

2.1 

2 

4 

112 

86 

19 

89 

71 

34 

42 

56 

500 

7 

2000 

27 

2.2 

2 

2.3 

3 

5 

111 

85 

20 

86 

70 

35 

39 

55 

600 

8 

2100 

28 

2.4 

3 

6 

110 

84 

21 

84 

69 

36 

35 

54 

700 

9 

2200 

29 

2.5 

4 

7 

109 

83 

22 

81 

68 

37 

31 

53 

800 

11 

2300 

31 

2.6 

5 

8 

103 

82 

23 

78 

67 

38 

27 

52 

900 

12 

2400 

32 

2-7 

7 

9 

107 

81 

24 

75 

66 

39 

23 

51 

1000 

13 

2500 

33 

2.8 

8 

2.9 

11 

10 

106 

80 

25 

72 

65 

40 

20 

50 

1100 

15 

2600 

35 

3.0 

13 

11 

104 

79 

26 

69 

64 

41 

16 

49 

1200 

16 

2700 

36 

3.1 

17 

12 

103 

78 

27 

66 

63 

42 

12 

48 

1300 

17 

2800 

37 

3.2 

21 

13 

101 

77 

28 

63 

62 

43 

8 

47 

1400 

19 

2900 

39 

3.3 

27 

14 

100 

76 

29       60 

61 

44 

4 

46 

1500 

20 

3000 

40 

3.4 

33 

3.5 

42 

15 

-98+ 

75 

30    -56+ 

60 

45 

-0+ 

45 

1600 

21 

3500 

47 

3.6 

53 

D                                                            59 

V. 


TABLES 


FOR  REDUCING  BAROMETRICAL  OBSERVATIONS  TO  ANOTHER  LEVEL,  AND  FOR  COMPUTING 
DIFFERENCES    OF    ELEVATION    MEASURED    BY   THE    BAROMETER,    BY   M.    C.    DIPPE. 

IN  No.  1088  of  the  Astronomische  Nachrichten,  published  in  June,  1857,  DR. 
DIPPE  gives  the  following  set  of  Tables  for  reducing  barometrical  observations  to 
another  level,  and  for  computing  heights.  These  tables,  being  based,  as  the  preced- 
ing ones  (IV.),  on  the  formula  of  Laplace,  and  computed  with  the  same  constants, 
give  results  nearly  identical,  but  dispense  with  the  use  of  logarithms. 


USE  OF  THE  TABLES. 

The  tables  suppose  the  height  of  the  barometer  to  be  expressed  in  French  inches 
or  Paris  lines,  and  the  temperature  in  degrees  of  Reaumur ;  they  give  the  differ- 
ences of  level  in  French  toises. 

The  signs  used  have  the  following  signification  :  — 

{B  =  Observed  Height  of  Barometer  in  Paris  lines. 
T  =  Attached  Thermometer  in  degrees  of  Reaumur. 
b    =  Barometer  reduced  to  the  freezing  point. 
t    =  Temperature  of  the  air,  detached  Thermometer. 

{B'  =  Observed  Height  of  Barometer. 
T'  =  Attached  Thermometer. 
I1  =  Barometer  at  the  freezing  point. 
t'  =  Temperature  of  the  air. 
<£  =  Latitude  of  the  place. 
h  =  Difference  of  elevation  between  the  two  stations. 


I.     For  Reducing  Barometrical  Observations  to  another  Level. 

Given,  h  in  toises,  £,  £',  <£,  and  b  or  I1. 
To  find  b  or  b'. 

Make  first  2  r  =  -d?-  and  T,  and 
D  60 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

In  Table  I.,  with  the  argument  2  T,  take  r'  ; 

In  Table  III.,  with  the  arguments  h  and  r,  take  C ; 

In  Table  IV.,  with  the  arguments  h  and  </>,  take  C7 ; 

Make,  further, 

„  =  h  +  C  +  C'  and  JL  T' ; 
And  if  1)'  be  given,  and  5  required, 

In  Table  II.,  with  the  argument  J,  take  H  ; 

then  is  H  =  H'  +  («-j^r-). 

and  the  height  of  the  barometer,  in  Table  II.,  due  to  H,  is  b  required. 
If  b  be  given,  and  T>'  required  for  a  level  higher  by  li  toises,  then, 

In  Table  II.,  with  the  argument  J,  take  H''. 
Make,  further, 

H'  =  H  -  («  -  ^  A 

and  I1  is  the  height  of  the  barometer  in  Table  II.,  corresponding  to  H'. 

Example    1. 

Suppose  the  height  of  the  barometer  reduced  to  the  freezing  point  to  be  I1  = 
295.39  Paris  lines  ;  the  temperature  of  the  air  t'  =  11°.8  Reaumur;  and  the  latitude 
$  =  51°. 48  ;  the  increase  of  heat  downwards  being  1°  Reaumur  for  100  toises. 
What  is  the  height  of  the  barometer  reduced  to  the  freezing  point,  at  a  station  lower 
by  h  =  498.2  toises? 

In  this  case,          t1  =  11°.8  ;  *  =  11°.8  +  4°.98  ;*  +  *'=  28°.58  ; 

2  T  =  '-t?  =  14°.29  ;  r  =  7°.15  ; 
and  according  to  Table  I.  r'  =  +  6.67. 

With  h  and  T,  in  Table  III.,  we  find  C  =  —    1.4 
With  h  and  </>,  in  Table  IV.,  we  find  C7  =  +    0.3 

We  add  h  =     498.2 

and  we  have  u  =      497.1 ;  joo=     4<9T1 

„  T'  =  4-  6.67 

—  r'  =  —  33.15  2983 

100  2.98 

.34 

463.95  _,,_          — - 

With  V,  in  Table  II.,  we  find  H7  =     367.86  10°  * 

H=      831.81 

Finally,  with  H,  in  Table  II.,  we  find  5  =  330.91  Paris  lines,  which  is  the  required 
height  of  the  barometer  at  the  lower  station.  Gauss's  tables  (IV.)  would  give  I  = 
330.90  lines. 

D  61 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

Example  2. 

Suppose   b'  —  330.46  Paris  lines  ;  t'  ==  —  12°.3  Reaumur ;   h'  =  92.7  toises ; 
<£  =  62°. 

In  this  case,  assuming  t  —  £', 

2  r  =  — —  =  —  12°.3 ;   T  =  —  6.15  ; 
and  according  to  Table  I.  r'  =  —  6.55. 

With  li  and  r,  in  Table  III.,  take  C  =  -  •    0.2 
With  h  and  <£,  in  Table  IV.,  take  C'  =  +    0.1 

Add  h  =     _92L7       . 
We  have  u  =       92.6  ~  =     0.926 

T'  =  —   6.55 
—  —  r'=+     6.07  5.56 


With  &',  in  Table  II.,  take  H'  =     826.22  10°  T' 

H=     924.89 

With  H,  in  Table  II.,  we  find  b  =  338.53  Paris  lines.    Gauss's  tables  (IV.)  would 
give  b  =  338.54  lines. 

II.  For  Computing  Differences  of  Elevation  from  Barometrical  Observations. 
Suppose  tfljke  given  B,  B',  T,  T',  t,  t',  <£ ;  required  h. 

Make  first  r  =  t-^-L  and  T  —  T'. 
4 

Then  in  Table  II.,  with  the  argument  -j 
and  make 


in  which  each  full  degree  of  T  —  T'  corresponds  to  a  toise. 

Further,  in  Table  III.,  with  u  and  T,  take  C  reversing  the  sign  ; 
in  Table  IV.,  with  u  and  <£,  take  C'  reversing  the  sign  ; 
in  Table  V.,  with  T  —  T'  and  r,  take  C  ''  with  the  signs  of  T  —  T'. 
Then  the  difference  of  elevation  required  is 

h  =  u  +  C  +  C'  +  C". 
If  the  heights  of  the  barometer,  reduced  to  the  freezing  point,  or  b  and  Z>',  are  given, 

then  in  Table  II.,  with  the  argument,  j 
and  make 


Further,  in  Table  III.,  take  C  reversing  the  sign  ; 
in  Table  IV.,  take  C'  reversing  the  sign  ; 
and 

ft  =  u  +  C  +  C'. 

D  62 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 


Example  1. 

Suppose  to  be  given, 

B  =  333.6  Paris  lines ;  T  =  +  17°.0  Reaumur ;  t  =  +  19°.0  R. ;  4 
B'  =  289.9  Paris  lines  ;  T'  =  +  16°.3  Reaumur  ;  t'  =  +  15°.2  R. 
T  —  T'  =    0°.7  t  +  t'  =  +  34°.2 

T   =    +         8'55 

In  Table  II.  with  B  take  H  =  864.9 
"         with  B' take  H'  =  291.2 

H  —  H' =  573.7    -        -10^  =    5J3 

TT  TT/  T=+8.55 

?-=,=     49.06 
_  (T  —  T')  =  — 0/7_          H_H!T 

u  =  622.06  10° 

In  Table  III.,  with  u  and  T,  take  C  =  +1.8 
In  Table  IV.,  with  u  and  <£,  take  C'  =  —0.2 
In  Table  V.,  with  T  —  T'  and  T  take  C"  =  0.0 


Difference  of  elevation,  or  h  =  623.66  toises. 
Gauss's  Tables  give  623.64  toises. 

Example  2. 

Suppose  to  be  given, 

I  =  342.68  Paris  lines  ;  t   =  —  10°.38  Reaumur  ;  <j>  =  65°. 
V  =  285.47  Paris  lines  ;  t1  =  —  14°.94  Reaumur ;  T  —  T  =  0°.  R. 
*  +  t1  =  —  25°.32 
T  =  _      6.33 

In  Table  II.  with  I  take  H  =    974.58 
with  V  take  H'  =    228.28 

H  —  H'  =    746.30  ~^'=     7*63 

TT TT'  T  =  —  6.33 

— -  T  =  —47  24  ~44Ts 

100  2.24 

.22 

u=    699.06  !L-H'T-T4727 

In  Table  III.,  with  u  and  r,  take  C  =  +1.8 
In  Table  IV.,  with  u  and  </>,  take  C'  = .  —  1.2 

li=    699.66 

Gauss's  Tables  give  h  =    699.72  toises. 


63 


V. 

TABLES 

FOR   REDUCING   BAROMETRICAL    OBSERVATIONS    TO    ANOTHER    LEVEL,    AND    FOR 
COMPUTING    DIFFERENCES    OF    ELEVATION,    BY    M.    C.    DIPPE. 

TABLE  I.  —  Argument,  the  observed  Height  of  the  Barometer  at  either  Station. 


Barom- 
eter in 
Paris 
Lines. 

BorB' 

Tenths  of  a  Line. 

o 

1 

2 

3 

4 

5 

6 

7 

8 

0 

II  or  II'  in  Toises  = 

270 

0.7 

2.2 

3.7 

5.2 

6.7 

8.2 

9.7 

11.2 

12.S 

14.3 

271 

15.8 

17.3 

18.8 

20.3 

21.8 

23.3 

24.8 

26.3 

27.8 

29.3    i 

272 

30.8 

32.3 

33.8 

35.3 

36.8 

38.3 

39.8 

41.3 

42.8 

44.3    i 

273 

45.8 

47.3 

48.8 

50.3 

51.8 

53.3 

54.8 

56.3 

57.8 

59.3    I 

274 

60.8 

62.2 

63.7 

65.2 

66.7 

68.2 

69.7 

71.2 

72.7 

74.1 

275 

75.6 

77.1 

78.6 

80.1 

81.6 

83.1 

84.5 

86.0 

87.5 

89.0 

33  Inch. 

276 

90.5 

91.9 

93.4 

94.9 

96.4 

97.9 

99.3 

100.8 

102.3 

103.8 

277 

105.2 

106.7 

108.2 

109.7 

111.1 

112.6 

114.1 

115.6 

117.0 

118.5 

278    . 

120.0 

121.4 

122.9 

124.4 

125.8 

127.3 

128.8 

130.2 

131.7 

133.2 

279 

134.6 

136.1 

137.6 

139.0 

140.5 

142.0 

143.4 

144.9 

146.3 

147.8 

280 

149.3 

150.7 

152.2 

153.6 

155.1 

156.5 

158.0 

159.5 

160.9 

162.4 

281 

163.8 

165.3 

166.7 

168.2 

169.6 

171.1 

172.5 

174.0 

175.4 

176.9 

282 

178.3 

179.8 

181.2 

182.7 

184.1 

185.6 

187.0 

18S.5 

189.9 

191.4 

283 

192.8 

194.2 

195.7 

197.1 

198.6 

200.0 

201.4 

202.9 

204.3 

205.8 

284 

207.2 

208.6 

210.1 

211.5 

213.0 

214.4 

215.8 

217.3 

218.7 

220.1 

285 

221.6 

223.0 

224.4 

225.9 

227.3 

228.7 

230.2 

231.6 

233.0 

234.5 

286 

235.9 

237.3 

238.7 

240.2 

241.6 

243.0 

244.4 

245.9 

247.3 

248.7 

287 

250.1 

251.6 

253.0 

254.4 

255.8 

257.3 

258.7 

260.1 

261.5 

262.9 

a*  Inch. 

288 

264.4 

265.8 

267.2 

268.6 

270.0 

271.4 

272.9 

274.3 

275.7 

277.1 

289 

278.5 

279.9 

281.3 

282.8 

284.2 

285.6 

287.0 

288.4 

289.8 

291.2 

290 

292.6 

294.0 

295.4 

296.8 

298.3 

299.7 

301.1 

302.5 

303.9 

305.3 

291 

306.7 

308.1 

309.5 

310.9 

312.3 

313.7 

315.1 

316.5 

317.9 

319.3 

292 

320.7 

322.1 

323.5 

324.9 

326.3 

327.7 

329.1 

330.5 

331.9 

333.3 

293 

334.7 

336.1 

337.5 

338.9 

340.2 

341.6 

343.0 

344.4 

345.8 

347.2 

294 

348.6 

350.0 

351.4 

352.8 

354.2 

355.5 

356.9 

358.3 

359.7 

361.1 

295 

362.5 

363.9 

365.2 

366.6 

368.0 

369.4 

370.8 

372.2 

373.5 

374.9 

296 

376.3 

377.7 

379.1 

380.4 

381.8 

383.2 

384.6 

385.9 

3S7.3 

388.7 

297 

390.1 

391.5 

392.8 

394.2 

395.6 

397.0 

398.3 

399.7 

401.1 

402.4 

298 

403.8 

405.2 

406.5 

407.9 

409.3 

410.7 

412.0 

413.4 

414.8 

416.1 

299 

417.5 

418.9 

420.2 

421.6 

423.0 

424.3 

425.7 

427.1 

428.4 

429.8 

25  Inch. 

300 

431.1 

432.5 

433.9 

435.2 

436.6 

437.9 

439.3 

440.7 

442.0 

443.4 

301 

444.7 

446.1 

447.5 

448.8 

450.2, 

451.5 

452.9 

454.2 

455.6 

456.9 

302 

458.3 

459.6 

461.0 

462.3 

463.7 

465.0 

466.4 

467.8 

469.1 

470.5 

303 

471.8 

473.1 

474.5 

475.8 

477.2 

478.5 

479.9 

481.2 

482.6 

483.9 

304 

485.3 

486.6 

487.9 

489.3 

490.6 

492.0 

493.3 

494.7 

496.0 

497.3 

305 

498.7 

500.0 

501.4 

502.7 

504.0 

505.4 

506.7 

508.0 

509.4 

510.7 

306 

512.0 

513.4 

514.7 

516.0 

517.4 

518.7 

520.1 

521.4 

522.7 

524.0 

64 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  DIPPE. 

TABLE  I.    Continued. 


Barom- 
eter in 
Paris 
Lines. 

Tenths  of  a  Line. 

0 

1 

2 

3 

4 

5 

6 

7 

8 

9 

306 

512.0 

513.4 

514.7 

516.0 

517.4 

518.7 

520.1 

521.4 

522.7 

524.0 

307 

525.4 

526.7 

528.0 

529.4 

530.7 

532.0 

533.4 

534.7 

536.0 

537.4 

308 

538.7 

540.0 

541.3 

542.6 

544.0 

545.3 

546.6 

547.9 

549.3 

550.6 

309 

551.9 

553.2 

554.6 

555.9 

557.2 

558.5 

559.8 

561.2 

562.5 

563.8 

310 

565.1 

566.4 

567.8 

569.1 

570.4 

571.7 

573.0 

574.3 

575.6 

576.9 

311 

578.3 

579.6 

580.9 

582.2 

583.5 

584.8 

586.1 

587.5 

588.8 

590.1 

36  Inch. 

312 

591.4 

592.7 

594.0 

595.3 

596.6 

597.9 

599.2 

600.6 

601.9 

603.2 

313 

604.5 

605.8 

607.1 

608.4 

609.7 

611.0 

612.3 

613.6 

614.9 

616.2 

314 

617.5 

618.8 

620.1 

621.4 

622.7 

624.0 

625.3 

626.6 

627.9 

629.2 

315 

630.5 

631.8 

633.1 

634.4 

635.7 

637.0 

638.3 

639.5 

640.8 

642.1 

316 

643.4 

644.7 

646.0 

647.3 

648.6 

649.9 

651.2 

652.5 

653.8 

655.1 

317 

656.3 

657.6 

658.9 

660.2 

661.5 

662.8 

664.1 

665.4 

666.6 

667.9 

313 

669.2 

670.5 

671.8 

673.1 

674.3 

675.6 

676.9 

678.2 

679.5 

680.8 

319 

6S2.0 

683.3 

684.6 

685.9 

687.2 

688.4 

689.7 

691.0 

692.3 

693.6 

320 

694.8 

696.1 

697.4 

698.7 

699.9 

701.2 

702.5 

703.8 

705.0 

706.3 

321 

707.6 

708.9 

710.1 

711.4 

712.7 

713.9 

715.2 

716.5 

717.7 

719.0 

322 

720.3 

721.6 

722.8 

724.1 

725.4 

726.6 

727.9 

729.2 

730.4 

731.7 

323 

733.0 

734.2 

735.5 

736.7 

738.0 

739.3 

740.5 

741.8 

743.1 

744.3 

37  Inch. 

324 

745.6 

746.8 

748.1 

749.4 

750.6 

751.9 

753.2 

754.4 

755.7 

756.9 

325 

758.2 

759.4 

760.7 

761.9 

763.2 

764.5 

765.7 

767.0 

768.2 

769.5 

326 

770.7 

772.0 

773.2 

774.5 

775.7 

777.0 

778.2 

779.5 

780.7 

782.0 

327 

783.2 

784.5 

785.7 

787.0 

788.2 

789.5 

790.7 

792,0 

793.2 

794.5 

328 

795.7 

797.0 

798.  2 

799.4 

800.7 

801.9 

803.2 

804.4 

805.7 

806.9 

329 

808.2 

809.4 

810.6 

811.9 

813.1 

814.4 

815.6 

816.8 

818.1 

819.3 

330 

820.6 

821.8 

823.0 

824.3 

825.5 

826.7 

828.0 

S29.2 

830.4 

831.7 

331 

832.9 

834.2 

835.4 

836.6 

837.9 

839.1 

840.3 

841.6 

842.8 

844.0 

332 

845.2 

846.5 

847.7 

848.9 

850.2 

85V4 

852.6 

853.9 

855.1 

856.3 

333 

•  857.5 

858.8 

860.0 

861.2 

862.4 

863.7 

864.9 

866.1 

867.3 

868.6 

334 

869.8 

871.0 

872.2 

873.4 

874.7 

875.9 

877.1 

878.3 

879.6 

880.8 

335 

882.0 

883.2  ' 

884.4 

885.7 

886.9 

888.1 

889.3 

890.5 

891.7 

893.0 

38  Inch. 

336 

894.2 

895.4 

896.6 

897.8 

899.0 

900.3 

901.5 

902.7 

903.9 

905.1 

337 

906.3 

907.5 

908.7 

909.9 

911.2 

912.4 

913.6 

914.8 

916.0 

917.2 

338 

918.4 

919.6 

920.8 

922.0 

923.3 

924.5 

925.7 

926.9 

928.1 

929.3 

339 

930.5 

931.7 

932.9 

934.1 

935.3 

936.5 

937.7 

938.9 

940.1 

941.3 

340 

942.5 

943.7 

944.9 

946.1 

947.3 

948.5 

949.7 

950.9 

952.1 

953.3 

341 

954.5 

955.7 

956.9 

958.1 

959.3 

960.5 

961.7 

962.9 

964.1 

965.3 

312 

966.5 

967.7 

968.9 

970.1 

971.3 

9725 

973.7 

974.8 

976.0 

977.2 

343 

978.4 

979.6 

980.8 

982.0 

983.2 

984.4 

985.6 

986.8 

987.9 

989.1 

344 

990.3 

991.5 

992.7 

993.9 

995.1 

99612 

997.4 

998.6 

999.8 

1001.0 

345 

1002.2 

1003.4 

1004.5 

1005.7 

1006.9 

1008.  1 

1009.3 

1010.5 

1011.6 

1012.8 

346 

1014.0 

1015.2 

1016.4 

1017.5 

1018.7 

1019.9 

1021.1 

1022.3 

1023.4 

1024.6 

347 

1025.8 

1027.0 

1028.1 

1029.3 

1030.5 

1031.7 

1032.8 

1034.0 

1035.2 

1036.4 

39  Inch 

348 

1037.5 

1038.7 

1039.9     1041.1 

1042.2 

1043.4 

1044.6 

1045.8 

1046.9 

1048.1 

D 


65 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  DIPPE. 


TABLE  II. 

CORRECTION    FOR    THE    TEMPERATURE    OF    THE    AIR. 


ARGUMENT,  2r  =  —  -'  —  . 


2r 

r' 

Diff. 

2r 

i' 

Diff. 

2r 

i' 

Diff. 

2r 

T' 

Diff. 

-25 

-14.29 

-12 

-6.38 

+    1 

+0.50 

+14 

+  6.54 

-24 

-13.64 

0.65 

-11 

-5.82 

0.56 

2 

0.99 

0.49 

15 

6.98 

0.44 

-23 

-13.00 

0.64 

-10 

-5.26 

0.56 

3 

1.48 

0.49 

16 

7.41 

0.43 

-22 

-12.36 

0.64 

-  9 

-4.71 

0.55 

4 

1.96 

0.48 

17 

7.83 

0.42 

-21 

-11.73 

0.63 

-  8 

-4.17 

0.54 

5 

2.44 

0.48 

18 

8.26 

0.43  - 

0.62 

0.54 

0.47 

0.42 

-20 

-11.11 

-  7 

-3.63 

6 

2.91 

19 

8.68 

-19 

-10.50 

0.61 

-  6 

-3.09 

0.54 

7 

3.38 

0.47 

20 

9.09 

0.41 

-18 

-  9.89 

0.61 

-  5 

-2.56 

0.53 

8 

3.85 

0.47 

21 

9.50 

0.41 

-17 

-  9.29 

0.60 

-  4 

-2.04 

0.52 

9 

4.31 

0.46 

22 

9.91 

0.41 

-16 

-  8.70 

0.59 

-  3 

-1.52 

0.52 

10 

4.76 

0.45 

23 

10.31 

0.40 

0.59 

0.51 

0.45 

0.40 

-15 

-  8.11 

-  2 

-1.01 

11 

5.21 

24 

10.71 

-14 

-  7.53 

0.58 

-  1 

-0.50 

0.51 

12 

5.66 

0.45 

25 

11.11 

0.40 

-13 

-  6.95 

0.58 

0 

0.00 

0.50 

13 

6.10 

0.44 

26 

11.50 

0.39 

-12 

-  6.38 

0.57 

+  1 

+0.50 

0.50 

+14 

+6.54 

0.44 

+27 

+11.89 

0.39 

TABLE  III.  FOR  C. 

ARGUMENTS,  h  and  r. 

In  computing  Heights  reverse  the  signs  of  C.  —  Arguments,  T  and  u. 

&,(«) 

T,  in  Degrees  of  Reaumur  = 

Toises. 

—16° 

—12° 

—8° 

-.40 

O° 

+4° 

+  8°' 

+  12° 

+16° 

50 

0.1 

0.1 

0.1 

0.1 

0.1 

0.1 

0.1 

0.1 

0.1 

100 

0.2 

0.2 

0.2 

0.2 

0.3 

0.3 

0.3 

0.3 

0.3 

150 

0.3 

0.3 

0.4 

0.4 

0.4 

0.4 

0.4 

0.4 

0.4 

200 

0.4 

0.5 

0.5 

0.5 

0.5 

0.5 

0.6 

0.6 

0.6 

250 

0.5 

0.6 

0.6 

0.6 

0.6 

0.7 

0.7 

0.7 

0.7 

300 

0.7 

0.7 

0.7 

0.7 

0.8 

0.8 

0.8 

0.9 

0.9 

350 

0.8 

0.8 

0.8 

0.9 

0.9 

0.9 

1.0 

1.0 

1.1 

400 

0.9 

0.9 

1.0 

1.0 

.0 

1.1 

1.1 

1.2 

1.2 

450 

1.0 

.1 

1.1 

1.1 

.2 

1.2 

1.3 

1.3 

1.4 

500 

1.1 

.2 

1.2 

1.3 

.3 

1.4 

1.4 

1.5 

1.5 

550 

1.2 

.3 

1.4 

1.4 

.5 

1.5 

1.6 

1.6 

1.7 

600 

1.4 

.4 

1.5 

1.6 

.6 

1.7 

1.7 

1.8 

1.9 

650 

1.5 

.6 

1.6 

1.7 

1.8 

1.8 

1.9 

1.9 

2.0 

700 

1.6 

.7 

1.8 

1.8 

1.9 

2.0 

2.0 

2.1 

2.2 

750 

1.7 

.8 

1.9 

2.0 

2.0 

2.1 

2.2 

2.3 

2.3 

800 

1.9 

2.0 

2.0 

2.1 

2.2 

2.3 

2.4 

2.4 

2.5 

850 

2.0 

2.1 

2.2 

2.3 

2.3 

2.4 

2.5 

2.6 

2.7 

900 

2.1 

2.2 

2.3 

2.4 

2.5 

2.6 

2.7 

2.8 

2.9 

950 

2.3 

2.4 

2.5 

2.6 

2.7 

2.7 

2.9 

3.0 

3.1 

1000 

2.4 

2.5 

2.6 

2.7 

2.8 

2.9 

3.1 

3.2 

3.3 

D 


66 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.  DIPPE. 


TABLE  IV.  FOR  C'. 

CORRECTION    IN    TOISES    FOR   THE    CHANGE    OF    GRAVITY    IN    LATITUDE. 
In  computing  Heights,  reverse  the  signs  of  C'.    ARGUMENTS  <p  and  «. 


1  :  :  —  
Latitude. 

Approximate  Difference  of  Level,  in  Toises. 

— 

+         100 

2OO     3OO 

4OO 

500 

600 

700 

800 

90O 

1000 

0 

90 

0.3 

0.5 

0.8 

1.0 

.3 

.6 

1.8 

2.1 

2.3 

2.6 

5 

85 

0.3 

0.5 

0.8 

1.0 

.3 

.5 

1.8 

2.0 

2.3 

2.6 

10 

80 

0.2 

0.5 

0.7 

1.0 

.2 

.5 

1.7 

2.0 

2.2 

2.4 

15 

75 

0.2 

0.4 

0.7 

0.9 

.1 

.3 

1.6 

1.8 

2.0 

2.3 

20 

70 

0.2 

0.4 

0.6 

0.8 

.0 

.2 

1.4 

1.6 

1.8 

2.0 

25 

65 

0.2 

0.3 

0.5 

0.7 

0.8 

.0 

1.2 

1.3 

1.5 

1.7 

30 

60 

0.1 

0.3 

0.4 

0.5 

0.6 

0.8 

0.9 

1.0 

1.2 

1,3 

•35 

55          0. 

0.2 

0.3 

0.4 

0.4 

0.5 

0.6 

0.7 

0.8 

0.9 

36 

54 

i    0. 

0.2 

0.2 

0.3 

0.4 

0.5 

0.6 

0.6 

0.7 

0.8 

37 

53 

0. 

0.1 

0.2 

0.3 

0.4 

0.5 

0.5 

0.6 

0.6 

0.7 

33 

52 

0. 

0.1 

0.2 

0.3 

0.3 

0.4 

0.4 

0.5 

0.6 

0.6 

39 

51 

;  o. 

0.1 

0.2 

0.2 

0.3 

0.3 

0.4 

0.4 

0.5 

0.5 

40 

50 

0. 

0.1 

0.1 

0.2 

0.2 

0.3 

0.3 

0.4 

0.4 

0.5 

41 

49 

0.0 

0.1 

0.1 

0.1 

0.2 

0.2 

0.3 

0.3 

0.3 

0.4 

42 

48 

0.0 

0.1 

0.1 

0.1 

0.1 

0.2 

0.2 

0.2 

0.2 

0.3 

43 

47 

0.0 

0.0 

0.1 

0.1 

0.1 

0.1 

0.1 

0.1 

0.2 

0.2 

44 

46 

0.0 

0.0 

0.0 

0.0 

0.0 

0.1 

0.1 

0.1 

0.1 

0.1 

45 

45 

;  o.o 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

TABLE  V.  FOR  C". 

ARGUMENTS  r  and  T  — 

T'.    To  be  used  only  in  computing  Heights. 

Correction  for  T  —  T  ,  in  Toises,  with  the  same  sign  ;  T  = 

Reaumur         —  12° 

—10° 

—8° 

—6°      —4° 

—2° 

o° 

+2° 

+4° 

-f  6°  ! 

o           o.o 

0.0 

0.0 

0.0         0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

1                0.2 

0.2 

0.2 

0.1          0.1 

0.1 

0.1 

0.1 

o.o 

0.0 

2                0.4 

0.3 

0.3 

0.3          0.2 

0.2 

0.2 

0.1 

0.1 

0.0 

3          •      0.6 

0.5 

0.5 

0.4          0.4 

0.3 

0.2 

0.2 

0.1 

0.1 

4                0.8 

0.7 

0.6 

0.5          0.5 

0.4 

0.3 

0.2 

0.2 

0.1 

5                  .0 

09 

0.8 

0.7          0.6 

0.5 

04 

0.3 

0.2 

0.1 

6                  -1 

1.0 

0.9 

0.8          0.7 

0.6 

0.5 

0.4 

0.3 

0.1 

7                  -3 

1.2 

1.1 

0.9          0.8 

0.7 

0.6 

0.4 

0.3 

0.2 

8                  .5 

14 

12 

1.1          0.9 

0.8 

0.6 

0.5 

0.3 

0.2 

9                  -7 

1.6 

1.4 

1.2          1.1 

09 

0.7 

0.6 

0.4 

0.2 

10                 .9 

1.7 

1.5 

1.4          1.2 

1.0 

0.8 

0.6 

0.4 

0.2 

Correction  for  T  —  T'  with  contrary  sign  ;  T  = 

T—  T'        |    +8° 

+1O°    +12° 

+14° 

T  —  T' 

+8° 

+  1O°    +12° 

+14°  j 

1                0.0 

0.0 

0.0 

0.0 

6 

0.0 

0. 

0.2 

0.3 

2                0.0 

0.0 

0.1 

0.1 

7 

0.0 

0. 

0.2 

0.3 

3                0.0 

0.0 

0.1 

0.1 

8 

0.0 

0. 

0.2 

0.4 

4                0.0 

o.o 

0.1 

0.2 

9 

0.0 

0. 

0.2 

0.4 

5          j      0.0 

0.1           0.2 

0.2 

10 

0.0 

0. 

0.3 

0.4 

D 


67 


VI. 


BAROMETRICAL    OBSERVATIONS,    MODIFIED    BY    BABINET. 

IN  the  Comptes  Rendus  de  PAcademie  des  Sciences  for  March,  1851,  M.  Babinet 
proposes  the  following  modification  of  Laplace's  formula,  the  object  of  which  is  to 
dispense  both  with  the  use  of  logarithms  and  with  tables  of  any  kind. 

Laplace's  formula  is, 

%  =  18393  metres  (log  H  —  log  A)  [l  +  -^J^]  , 

2  being  the  difference  of  level  between  the  two  stations, 

H,  the  height  of  barometer  at  the  lower  station, 

7i,  the  height  of  barometer  at  the  upper  station, 

T,  temperature  of  air  at  the  lower  station, 

£,  temperature  of  air  at  the  upper  station. 

The  two  barometers  are  supposed  to  be  reduced  to  the  same  temperature.  The 
small  correction  for  the  latitude  is  omitted. 

For  elevations  less  than  1000  metres,  and  even  for  much  greater  elevations,  if 
approximate  results  only  are  needed,  the  formula  may  be  transformed  into  the  fol- 
lowing : 


Example    1. 
Suppose, 

at  lower  station,  barometer  at  zero  Cent.  =    755mm-  ;  temperature  of  air  15°  Cent. 
at  upper  station,  barometer  at  zero  Cent.  =    745mra>  ;  temperature  of  air  10°  Cent. 

H  —  A  =    ~lo"mn-  T  +  t  =  25°  Cent. 

H  +  h  =  1500"-  2  (T  +  t)  =  T$fo  =  .05. 

Then  2  =  16000T£fo  X  (1-05)  =  112  metres. 

Laplace's  formula,  by  Delcros's  tables,  would  give  111.6  metres. 

Example  2. 
Suppose, 

at  lower  station,  barometer  at  zero  Cent.  =    730mm-  ;  temperature  of  air  20°  Cent. 
at  upper  station,  barometer  at  zero  Cent.  =    635mm  ;  temperature  of  air  15°  Cent. 

H  —  h  =      95mm-  T  +  t  =  35°  Cent. 

H  +  h  =  1365™-  2  (T  +  t)  =  T£fo  =  .07. 

Then  z  =  16000T||^  X  (1-07)  =  1191.5  metres. 

Laplace's  formula,  by  Delcros's  tables,  would  give    1191.1  metres. 
For  greater  elevations  an  intermediate  station  may  be  supposed. 
Babinet's  formula  reduced  to  English  measures  becomes, 


%  =  52494  English  feet  ^~  [l  + 


but  as,  in  this  form,  it  loses  the  simplicity  of  its  coefficient,  it  will  be  found,  on  trial, 
that  its  use  requires  rather  more  computing  than  the  author's  tables  (II.),  p.  38,  which 
give  more  accurate  results. 

D  68 


VII. 

TABLE  S 


FOR    COMPUTING   THE    DIFFERENCE    IN    THE    HEIGHTS    OF   TWO    PLACES   BY    MEANS    OF 

THE    BAROMETER. BAILY. 


BAILY,  in  his  Astronomical  Tables  and  Formula,  page  111,  gives  the  following 
final  formula  : 

a?  =  60345.51  \\  +  .0011111  (*  +  t1  — •  64°)  \ 

X  log  of  {|  x  1  +  .0001i(T^0}  X  \l  +  .002695  cos 

Where  <£  =  the  latitude  of  the  place, 

/3  —  the  height  of  the  barometer,  ^ 

T  =  the  temperature,  Fahrenheit,  of  the  mercury,  £-at 

t   =  the  temperature,  Fahrenheit,  of  the  air,  ) 

ft'  =  the  height  of  the  barometer,  ^ 

t>  =  the  temperature,  Fahrenheit,  of  the  mercury,   [•  * 
t1  =  the  temperature,  Fahrenheit,  of  the  air.  ) 

The  numerical  values  assumed  are  as  follows :  — 

The  constant  barometrical  coefficient  =  60158.53  English  feet. 

The  expansion  of  moist  air  for  1°  Fahrenheit  =  .0022222. 

The  expansion  of  mercury  for  1°  Fahrenheit  =  .0001001. 

The  increase  of  gravitation  from  Equator  to  Poles  =  .00539. 

The  radius  of  the  Earth  at  0  =  20898240  English  feet. 

The  height  of  lower  station  assumed  =  4000  English  feet. 

Make  A  =  the  log  of  the  first  term,  in  English  feet. 
B  =  the  log  of  1  +  .0001  (r  — T'). 
C  =  the  log  of  the  last  term. 
D  =  log/3  —  (log/3'  +  B). 

Then,  by  the  tables  which  follow,  the  logarithm  of  the  difference  of  altitude  in 

English  feet 

=  A  +  C  +  log  D. 

These  tables  are  given  as  printed  in  Lee's  Collection  of  Tables  and  Formula,  for 
the  Use  of  the  Topographical  Engineers,  U.  S.  Army,  2d  edition,  pp.  84,  85. 
D  69 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. BAILY. 


I.  THERMOMETERS  IN  THE  OPEN  AIR. 

t  +  f 

A 

t  +  t' 

A 

t  +  t' 

A 

t  +  t' 

A 

t  +  t' 

A 

0 

1 

4.74914 

0 

37 

4.76742 

o 
73 

4.78497 

o 
109 

4.80183 

o 
145 

4.81807 

2 

4.74966 

38 

4.76792 

74 

4.78544 

110 

4.80229 

146 

4.81851 

3 

4.75017 

39 

4.76842 

75 

4.78592 

111 

4.80275 

147 

4.81895 

4 

4.75069 

40 

4.76891 

76 

4.78640 

112 

4.80321 

148 

4.81939 

5 

4.75120 

41 

4.76941 

77 

4.78688 

113 

4.80367 

149 

4.81983 

6 

4.75172 

42 

4.76990 

78 

4.78735 

114 

4.80412 

150 

4.82027 

7 

4.75223 

43 

4.77039 

79 

4.78783 

115 

4.80458 

151 

4.82071 

8 

4.75274 

44 

4-77089 

80 

4.78830 

116 

4.80504 

152 

4.82115 

9 

4.75326 

45 

4.77138 

81 

4.78878 

117 

4.80550 

153 

4.82159 

10 

4.75377 

46 

4.77187 

82 

4.78925 

118 

4.80595 

154 

4.82203 

11 

4.75428 

47 

4.77236 

83 

4.78972 

119 

4.80641 

155 

4.82247 

12 

4.75479 

48 

4.77285 

84 

4.79019 

120 

4.80687 

156 

4.82291 

13 

4.75531 

49 

4.77334 

85 

4.79066 

121 

4.80732 

157 

4.82335 

14  ' 

4.75582 

50 

4.77383 

86 

4.79113 

122 

4.80777 

158 

4.82379  ! 

15 

4.75633 

51 

4.77432 

87 

4.791CO 

123 

4.80822 

159 

4.82423 

16 

4.75684 

52 

4.77481 

88 

4.79207 

124 

4.80867 

160 

4.82466 

17 

4.75735 

53 

4.77530 

89 

4.79254 

125 

4.80912 

161 

4.82510 

18 

4.75786 

54 

4.77579 

90 

4.79301 

126 

4.80957 

162 

4.82553 

19 

4.75837 

55 

4.77628 

91 

4.79348 

127 

4.81002 

163 

4.82596 

20 

4.75888 

56 

4.77677 

92 

4.79395 

128 

4.81047 

164 

4.82640 

4.81092 

165 

4.82683 

21 

4.75938 

57 

4.77726 

93 

4.79442 

129 

22 

4.75989 

58 

4.77774 

94 

4.79488 

130 

4.81137 

166 

4.82727 

23 

4.76039 

59 

4.77823 

95 

4.79535 

131 

4.81182 

167 

4.82770 

24 

4.76090 

60 

4.77871 

96 

4.79582 

132 

4.81227 

168 

4.82813 

25 

4.76140 

61 

4.77919 

97 

4.79629 

133 

4.81272 

169 

4.82857 

26 

4.76190 

62 

4.77968 

98 

4.79675 

134 

4.81317 

170 

4.82900 

27 

4.76241 

63 

4.78016 

99 

4.79722 

135 

4.81362 

171 

4.82943 

28 

4.76291 

64 

4.78065 

100 

4.79768 

136 

4.81407 

172 

4.82986 

29 

4.76342 

65 

4.78113 

101 

4.79814 

137 

4.81452 

173 

4.83030 

30 

4.76392 

66 

4.78161 

102 

4.79860 

138 

4.81496 

174 

4.83073 

31 

4.76442 

67 

4.78209 

103 

4.79907 

139 

4.81541 

175 

4.83116 

32 

4.76492 

68 

4.78257 

104 

4.79953 

140 

4.81585 

176 

4.83159 

33 

4.76542 

69 

4.78305 

105 

4.79999 

141 

4.81630 

177 

4.83201 

34 

4.76592 

70 

4.78352 

106 

4.80045 

142 

4.81675 

178 

4.83244 

35 

4.76642 

71 

4.78400 

107 

4.80091 

143 

4.81719 

179 

4.83287 

36 

4.76692 

72 

4.78449 

108 

4.80137 

144 

4.81763 

180 

4.83329 

D 


70 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. BAILY. 


II.     ATTACHED  THERMOMETER. 

III.     LATITUDE    OF 
THE   PLACE. 

r  —  T 

B 

T  T 

B 

T  —  r' 

B 

<£ 

C 

0 

0 

0.00000 

0 

20 

0.00087 

0 

40    . 

0.00174 

o 
0 

0.00117 

1 

0.00004 

21 

0.00091 

41 

0.00178 

5 

0.00115 

2 

0.00009 

22 

0.00096 

42 

0.00182 

10 

0.00110 

3 

0.00013 

23 

0.00100 

43 

0.00187 

15 

0.00100 

4 

0.00017 

24 

0.00104 

44 

0.00191 

20 

0.00090 

5 

0.00022 

25 

0.00109 

45 

0.00195 

25 

0.00075 

6 

0.00026 

26 

0.00113 

46 

0.00200 

30 

0-00058 

7 

0.00030 

27 

0.00117 

47 

0.00204 

35 

0.00040 

8 

0.00035 

28 

0.00122 

48 

0.00208 

40 

0.00020 

9 

0.00039 

29 

0.00126 

49 

0.00213 

45 

0.00000 

10 

0.00043 

30 

0.00130 

50 

0.00217 

50 

9.99980 

11 

0.00048 

31 

0.00135 

51 

0.00221 

55 

9.99960 

12 

0.00052 

32 

0.00139 

52 

0.00226 

60 

9.99942 

13 

0.00056     . 

33 

0.00143 

53 

0.00230 

65 

9.99925 

14 

0.00061 

34 

0.00148 

54 

0.00234 

70 

9.99910 

15 

0.00065 

35 

0.00152 

55 

0.00239 

75 

9.99900 

16 

0.00069 

36 

0.00156 

56 

0.00243 

80 

9.99890 

17 

0.00074 

37 

0.00161 

57 

0.00247 

85 

9.99885 

18 

0.00078 

38 

0.00165 

58 

0.00252 

90 

9.99883 

19 

0.00083 

39 

0.00169 

59 

0.00256 

EXAMPLE. 


Thermometer  in  open  air, 
Attached  Thermometer, 
Barometer, 
Latitude  of  the  place 

B  =  0.00031 

log  &  =  1.37401 

1.37432 

log  0  =  1.47784 
D  =  0.10352 


Upper  Station.  Lower  Station. 

t'  =  70.4,  t  =  77.6. 

r1  =  70.4,  T  =  77.6. 

/3'  =  23.66  inches,  /3  =  30.05  inches. 

$  =  21°. 

log  D  —  9.01502 

C  —  0.00087 

A  =  4.81939 

3.83528 

=  6843.7  English  feet. 


D 


71 


VIII. 


TABLES 


FOR     COMPUTING     DIFFERENCES    OF    ELEVATION     FROM     BAROMETRICAL     OBSERVATIONS. 


BY    E.  PLANTAMOUK. 


[These  Tables,  computed  by  Professor  E.  PLANTAMOUR,  Director  of  the  Observatory  at  Geneva, 
Switzerland,  are  found  in  Vol.  XIII.  Part  1,  of  the  Me  moires  de  la  Socie'te  de  Physique,  8fc.  de  Geneve, 
p.  63,  together  with  the  following  explanations.] 


IN  No.  356  of  the  Aslronomische  Nachrichten,  Bessel  published  a  paper  on  the 
measurement  of  heights  by  means  of  the  barometer,  in  which  he  deduces  a  formula 
which  contains  a  factor  depending  on  the  humidity  of  the  air.  This  formula  is  : 


.H'—  H.  0.002561  0.0279712  T  —  0.0000625826  T 


1 


where  the  various  quantities  have  the  following  signification  :  — 

h  being  the  elevation  of  the  lower  station,  and 

Ji'  the  elevation  of  the  upper  station  above  the  level  of  the  sea, 

a    =  the  radius  of  the  Earth, 

t  *    Z, 

TT      


a  +  ft' 

H'=    a/i/ 


a  +  /*" 

P    —  the  weight  of  the  atmosphere  at  the  lower  station, 
P'   =  the  weight  of  the  atmosphere  at  the  upper  station, 

the  unit  of  weight  assumed  being  the  pressure  of  a  column  of  mercury 
D  72 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

of  336.905  Paris  lines,  at  the  temperature  of  the  freezing  point,  or  zero 
Reaumur,  and  under  the  45th  degree  of  latitude. 

(g)  =  the  gravity,  at  the  level  of  the  sea,  in  the   mean  latitude  between   the 
two  places  of  observation. 

Therefore,  calling  $  the  latitude, 

(g)  =  I  —  0.0026257  cos  0, 

?      =  the  constant  barometrical  coefficient  depending  on  the  relative  density  of 

the  mercury  and  of  the  air, 
Jc     =  the  coefficient  of  the  dilatation  of  the  air, 
T    =  the  mean  temperature  of  the  layer  of  air  between  the  lower  and  upper 

station, 
a     =  the  fraction  of  saturation  of  the  same  layer. 


The  second  term  in  the  parenthesis,  destined  to  take  into  account  the  aqueous 
vapor  in  the  air,  was  obtained  by  assuming  that  the  elastic  force  of  vapor  for  a 
temperature  T  is  represented,  in  unit  of  weight,  by  the  expression, 

p  =  0.0067407  X  10  0.0279712  T  -  0.0000625826  T«. 

Multiplying  the  second  member  by  336.905  we  find  the  expression  of  the  elastic 
force  of  vapor  that  Laplace  deduced  from  Dalton's  experiments.  Substituting,  in 
the  computation,  Regnault's  results,  the  numerical  value  of  these  coefficients  is  some- 
what changed,  and  we  find  then 

;>  =  0.0060527  X  10  0.0301975  T  -  0.000080170  T  . 

Bessel's  tables  give  the  difference  of  elevation  in  toises.  The  logarithm  of  the  dif- 
ference is  obtained  by  the  sum  of  four  logarithms.  The  same  form  is  preserved  in 
the  following  tables  ;  but  the  differences  of  elevation  are  given  in  metres. 

The  term  due  to  the  expansion  of  the  air  is  computed  in  Bessel's  tables  for  two 
values  of  the  coefficient,  viz.  that  of  Gay-Lussac,  0.00375,  and  that  of  Rudberg, 
0.003648  ;  in  the  new  tables  it  is  only  computed  for  that  of  Regnault,  0.003665. 

The  relative  density  of  dry  air  at  the  freezing  point,  under  a  barometrical  pressure 
of  Om-.76,  and  at  the  45th  degree  of  latitude,  and  of  mercury  in  the  same  circumstan- 
ces, adopted  by  Bessel,  is  that  determined  by  the  experiments  of  Biot  and  Arago,  viz. 

I 
10466  g.     The  value  of  that  constant  derived  from  Regnault's  experiments  has  been 

substituted.  Regnault  found  the  weight  of  a  litre  of  dry  air,  at  zero  Centigrade, 
under  a  pressure  of  Om-.76,  and  at  the  latitude  of  Paris,  to  be  1.293187  grammes, 
which,  reduced  to  the  gravity  of  the  45th  degree  of  latitude,  becomes  1.292732 
grammes.  The  weight  of  a  litre  of  mercury,  at  zero  Centigrade,  he  found  to  be 
13596  grammes  ;  the  ratio  is  thus  : 


10517.3' 
D  73 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

or  about  ^g-  smaller  than  the  value  adopted  by  Bessel.     If  the  constant  coefficient 

L  is  expressed  by  L  =  -=^- — ,  /z  being  the  modulus  of  the  common  logarithms,  its 
« /* 

numerical  value  becomes 

L  =  18404m-.8. 

In  order  to  reduce  the  formula  into  tables,  Bessel  caused  it  to  undergo  several 
modifications,  which  we  have  followed,  introducing  the  values  of  the  constants  above 
mentioned. 

Let  T)  and  1'  be  the  heights  of  the  barometer,  expressed  in  the  metrical  scale,  at 
the  two  stations ;  t  and  t1,  the  temperatures  of  the  mercury  measured  with  a  brass 
scale ;  we  have, 

p_         b         .    .      /     a     \2  (1  +  0.000018790 
~  Om'.76  '  W  *  Va-KV    (1  +  0.00018018.*)' 

and 

PI—       b'         (    \     (     a     V  C1 +0.00001879  Q 
-  Qm.jQ  •  WJ  '  \a  +  Ay    (1  +  0.000180180* 

Therefore, 

log  P  =  log  I  +  log  (g)  —  logOm-.76  —  ?-5^  —  p  t  [0.00018018  —  0.00001879], 

a 

logP  =  log  £' +  log  (g)  —  log  Ora-.76  — ^5-£-— ,»*'  [0.00018018  —  0.00001879]. 

& 

If  we  call  B,  B'  the  heights  of  the  barometer  reduced  to  the  freezing  point,  which 
we  obtain  by  making 

log  B  =  log  I  —  t .  0.000070095  ;         log  B'  =  log  V  —•  t' .  0.000070095, 

log|,-logB-logB'  +  ^2-|, 
and  with  sufficient  accuracy,  , 


Substituting  these  expressions  in  the  formula,  it  becomes, 

log  B  —  log  B'  = 

(g-)  .  H'  —  H  I"-  _  L  (1  -f  K  T)  _  q  .  0.001748          0.0301975  T  —  0.000080170  T2"] 
L(l-J-KT)  L      ~(J)T7329755~    ~Y~BB^ 


If  we  set  instead  of  a  the  half  sum  —  --    of  the  fraction  of  saturation  observed  at 

both  stations,  we  find,  after  some  transformations, 
D  74 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

I™  TV        te)  (H'-H)  (397.25 -KT) 
398.25.  L(1+KT) 

[(a  +  a')  .0.34807  0.0301975  T  —  0.0000801 70  T2~] 

1"~'(397.25  — KT)  v/BB''  J 

Making  further, 


398.25 


"397.25  —  KT"  v 

0.34807  0.0301975T— 0.000080170  T2 

397.25  —  KT  ' 

we  shall  have  for  the  logarithm  of  the  approximate  difference  of  level  between  the 
two  stations  H'  —  H, 

log  (H'  —  H)  =  log  [log  B  —  log  B'] 

+  log  V  +  log  -  — j— -,  +  log  ffi 


1  —  i 

Table  I.  gives  the  values  of  log  V  and  log  W,  both  of  which  only  depend  on  the 
temperature  ;  the  argument  is  the  sum  of  the  temperature  of  the  air,  T  and  T',  ob- 
served at  both  stations,  supposing  T  -f-  T'  =  2  T. 

Table  II.  gives  the  factor  depending  on  the  humidity  of  the  air ;  with  the  argu-, 
ment 


we  obtain 


log  -       ,     ,,  =  log  V. 
l  _  w  («  +  °  ) 

YBB- 

Table  III.  gives  the  factor  depending  on  the  latitude  for  every  degree,  viz. 

.   >°g«'  =  i°g^ 

The  logarithm  of  the  approximate  difference  is  thus  given  by  the  sum  of  four 
logarithms.  To  obtain  the  exact  elevation,  the  small  correction  found  in  Table  IV. 
must  be  added  to  the  number  corresponding  to  that  logarithm.  For  we  have,  with  the 
necessary  accuracy, 

h'  —  li  =  H7  —  H  +  ~  —  —  2. 
a  a 

H2 

Table  IV.  gives,  for  every  200  metres,  the  quantity  —  •  ;  the  number  in  the  table 

3, 

H'2 

corresponding  to  —  must  be  added  to  the  approximate  elevation  ;  and  the  number 

3, 

H2 

corresponding  to  —  must  be  subtracted  from  the  same. 

D  75 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 


USE  OF  THE  TABLES. 

Reduce  first  the  observed  height  of  the  barometer  at  both  stations  to  the  freezing 
point  by  means  of  the  usual  tables,  or  by  the  logarithmic  formula, 

log  B  =  log  b  —  t  .  0.00007,       log  B'  =  log  V  —  t'  0.00007  ; 

1)  and  1)'  being,  in  fractions  of  metre,  the  observed  heights  at  the  temperatures  t  and  t1 
marked  by  the  attached  thermometers  ;  and  B  and  B'  the  reduced  height  at  the  lower 
and  upper  station. 

Take  the  difference  of  log  B  and  log  B',  and  find,  in  the  tables  of  the  common 
logarithms,  the  logarithm  of  that  difference,  viz.  log  (log  B  —  log  B')  ;  find  also 
the  logarithm  of  the  product  A/  B  B',  or 


Make  further  the  sum  T  -f-  r1  of  the  temperature  of  the  air  at  both  stations,  and  like- 
wise the  sum  of  a  -j-  a'  of  the  fraction  of  saturation. 

Then,  in  Table  I.,  with  argument  T  -f-  r',  take  log  V  and  log  W  ;  further,  to  log  W 
add  log  (a  -f-  a'),  and  subtract  log  \/BB7  ;  and  with  the  logarithm  thus  obtained  as 
argument,  take  in  Table  II.  log  V. 

Table  III.  with  the  mean  latitude  of  the  stations  gives  log  G'. 

H'  —  H  being  the  approximate  difference  of  level  between  the  two  stations,  we 
have 

log  (H'  —  H)  =  log  (log  B  —  log  B')  +  log  V  +  log  V'  +  log  G'. 

The  altitude  of  the  lower  station  being  known,  we  deduce  from  H7  —  H  the  ap- 
proximate altitude,  H',  of  the  upper  station  ;  7i',  the  exact  altitude,  or  h'  —  7i,  the 
difference  of  elevation,  is  given  by  the  formula, 

TT'2  TT2 

li>  —  7i=H'  —  H  +  —  —  —  . 
a  a 

H'2          H2 

Table  IV.  gives  the  values  of  —  and  —  for  the  values  of  H'  or  H  for  every 

200  metres.  * 

Example  1. 

Computing  the  height  of  St.  Bernard,  taking  Geneva,  407  metres  above  the  level 
of  the  sea,  as  the  lower  station.  The  observation  gives, 

B  =  726.43  millimetres  B'  =  563.64  millimetres 

r  =  +  8°.97  Centigrade  r'  =  —  1°.89  Centig.  r  +  r'  =  +  7°.08 

„    =  0.77  a1    =  0.80  a  +  a'  =  1.57 

log  B  ==  9.86119  log  V  (B  B')  =  9.8061 

log  B'  =  9.75100  Table  I.  log  W  =  7.0511 

log  B  —  log  B'  =  0.11019  log  (a  +  «')  =  0.1959 

log  ^+£}.W  =  7.4409 
D  76 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

log  [log  B  —  log  B']  =       9.04215 

In  Table  I.  argt.  r  +  T'  =  +  7.08,  log  V  =        4.27164 

In  Table  II.  argt.  7.4409,  log  V7  =        0.00120 

In  Table  III.  argt.  46°,  log  G'  =  —  0.00004 

log  (H7  —  H)  =       3.31495 

H'  —  H  =     2065.1  metres. 


TT'  2  TJ  2 

In  Table  IV. —  =  + 

cl  tl 


0.9 


h'  —  h=     2066.0 
Geneva  altitude  h  —        407.0 
St.  Bernard  above  the  level  of  the  sea  h1  —      2473.0  metres. 


Example  2. 


Computing  the  height  of  Mont  Blanc  from  the  observations  of  Bravais  and  Martins, 
on  the  29th  of  August,  1844,  taking  St.  Bernard  (2473.0  metres)  as  the  lower  sta- 
tion. The  observation  gives, 


B  =  568.03  millimetres 
T  =  +  7°.6  Centigrade 

a    =          0.59 

log  B  =  9.75437 

log  B'  =  9.62766 

log  B  — log  B'  =  0.12671 


B'  =  424.29  millimetres 
r'   =  —  9°.l  Centig.  r 
a7    =          0.57  a 


r1  =  —  1°.5 
a'=          1.16 


logVBB7^ 

Table  I.  log  W  = 

log  (a  +  a')  = 


V/BB' 


9.6910 
6.9183 
0.0648 

=       7.2921 


9.10281 
4.26483 
0.00087 


log  [log  B  —  log  B']  = 

In  Table  I.  argt.  —  1°.5,   log  V   = 

In  Table  II.  argt.  7.2921,  log  V7  = 

In  Table  III.  argt.  46°,       log  G7  =  —  0.00004 

log  (IP  —  H)  =        3.36847 

II7  —  H  == 


H' 


In  Table  IV. 


with  argument  4800  -J-  - 


2336.0  metres. 
3.6 


H5 


with  argument  2473  —  -  -   =  —      0.9 

h'  —  h  =     2338.7 
h  =     2473.0 


St.  Bernard  altitude, 

Mont  Blanc  above  the  sea,  h'  =     4811.7  metres. 


D 


77 


HYPSOMETRICAL    TABLES. 


TABLE  I. 

Argument  =  T  -f-  T  '.  Centigrade  Degrees. 

TABLE  IV. 

Arg't.  =  Height. 

T+T'. 

log.  V. 

log.  W. 

T  +  T'. 

log.  V. 

log.  W. 

T+T'. 

log.  V. 

log.  W. 

H». 

H. 

+ 

o 

O 

O 

Metres. 

Metres. 

-24 

4.24644 

6.5362 

+15 

4.27783 

7.1692 

+54 

4.30711 

7.7033 

200 

0.01 

-23 

4.24728 

6.5441 

+16 

4.27861 

7.1839 

+55 

4.30784 

7.7160 

400 

0.03 

-22 

4.24811 

6.5620 

+17 

4.27938 

7.1985 

+56 

4.30856 

7.7287 

600 

0.06 

-21 

4.24894 

6.5797' 

+18 

4.28016 

7.2131 

+57 

4.30929 

7.7413 

800 

0.10 

-20 

4.24977 

6.5974 

+19 

4.28093 

7.2275 

+58 

4.31001 

7.7539 

1000 

0.16 

-19 

4.25059 

6.6157 

+20 

4.28170 

7.2420 

+59 

4.31073 

7.7664 

1200 

0.23 

-18 

4.25142 

6.6341 

+21 

4.28247 

7.2564 

+60 

4.31145 

7.7789 

1400 

0.31 

-17 

4.25225 

6.6521 

+22 

4.28323 

7.2708 

+61 

4.31217 

7.7914 

1600 

0.40 

-16 

4.25307 

6.6700 

+23 

4.28400 

7.2850 

+62 

4.31288 

7.8038 

1800 

0.51 

-15 

4.25389 

6.6879 

+24 

4.28477 

7.2993 

+63 

4.31360 

7.8161 

2000 

0.63 

-14 

4.25471 

6.7057 

+25 

4.28553 

7.3135 

+64 

4.31432 

7.8285 

2200 

0.76 

-13 

4.25553 

6.7232 

+26 

4.28629 

7.3276 

+65 

4.31503 

7.8407 

2400 

0.90 

-12 

4.25634 

6.7407 

+27 

4.28705 

7.3417 

+66 

4.31574 

7.8530 

2600 

1.06 

-11 

4.25716 

6.7581 

+28 

4.28781 

7.3557 

2800 

1.23 

-10 

4.25797 

6.7755 

+29 

4.28857 

7.3697 

3000 

1.41 

-  9 

4.25878 

6.7926 

+30 

4.28933 

7.3837 

3200 

1.61 

-  8 

4.25959 

6.8096 

+31 

4.29008 

7.3975 

3400 

1.82 

-  7 

4.26040 

6.8266 

+32 

4.29084 

7.4114 

3600 

2.04 

-  6 

4.26121 

6.8436 

+33 

4.29159 

7.4252 

3800 

2.27 

-  5 

4.26202 

6.8603 

+34 

4.29234 

7.4389 

4000 

2.51 

-  4 

4.26282 

6.8770 

+35 

4.29319 

7.4526 

4200 

2.77 

-  3 

4.26362 

6.8935 

+36 

4.29384 

7.4662 

4400 

3.04 

-  2 

4.26443 

6.9100 

+37 

4.29459 

7.4798 

4600 

3.32 

-  1 

4.26523 

6.9263 

+38 

4.29534 

7.4933 

4800 

3.62 

0 

4.26603 

6.9426 

+39 

4.29608 

7.5068 

5000 

3.93 

+  1 

4.26682 

6.9581 

+40 

4.29683 

7.5202 

5200 

4.25 

+  2 

4.26762 

6.9736 

+41 

4.29757 

7.5336 

5400 

4.58 

+  3 

4.26841 

6.9889 

+42 

4.29831 

7.5470 

5600 

4.93 

+  4- 

4.26921 

7.0043 

+43 

4.29905 

7.5602 

5800 

5.28 

+  5 

4.27000 

7.0195 

+44 

4.29979 

7.5735 

6000 

5.65 

+  6 

4.27079 

7.0347 

+45 

4.30053 

7.5867 

6200 

6.04 

+  7 

4.27157 

7.0499 

+46 

4.30127 

7.5999 

6400 

6.43 

+  8 

4.27236 

7.0650 

+47 

4.30200 

7.6130 

6600 

6.84 

+  9 

4.27315 

7.0800 

+48 

4.30273 

7.6260 

6800 

7.26 

+10 

4.27393 

7.0950 

+49 

4.30347 

7.6390 

7000 

7.70 

+11 

4.27471 

7.1099 

+50 

4.30420 

7.6519 

7200 

8.14 

+12 

4.27550 

7.1248 

+51 

4.30493 

7.6648 

7400 

8.60 

+13 

4.27628 

7.1397 

+52 

4.30566 

7.6777 

+14 

4.27705 

7.1545 

+53 

4.30639 

7.6905 

+15 

4.27783 

7.1692 

+54 

4.30711 

7.7033 

HYPSOMETRICAL    TABLES. 


TAB] 

Argument  =  Ic 

^E  II. 

tr  "W  '  *  ~f~  * 



TABLE  III. 

Argument  =  Latitude. 

Argum't. 

log.  V. 

Argum't. 

log.  V. 

Argum't. 

log.  V. 

log.  G'. 

'• 

log.  G'. 

6.5 

0.00014 

7.70 

0.00218 

8.09 

0.00538 

o 
0 

+0.00114 

o 
40 

+0.00020 

6.6 

0.00017 

7.71 

0.00223 

8.10 

0.00550 

1 

+0.00114 

41 

+0.00016 

6.7 

0.00022 

7.72 

0.00229 

8.11 

0.00563 

2 

+0.00114 

42 

+0.00012 

6.8 

0.00027 

7.73 

0.00234 

8.12 

0.00576 

3 

+0.00114 

43 

+0.00008 

6.9 

0.00034 

7.74 

0.00239 

8.13 

0.00590 

4 

+0.00113 

44 

+0.00004 

7.0 

0.00043 

7.75 

0.00245 

8.14 

0.00604 

5 

+0.00112 

45 

0.00000 

7.1 

0.00055 

7.76 

0.00251 

8.15 

0.00618 

6 

+0.00112 

46 

-0.00004 

7.2 

0.00069 

7.77 

0.00256 

8.16 

0.00632 

7 

+0.00111 

47 

-0.00008 

7.3 

0.00087 

7.78 

0.00262 

8.17 

0.00647 

8 

+0.00110 

48 

-0.00012 

7.4 

0.00109 

7.79 

0.00269 

8.18 

0.00662 

9 

+0.00109 

49 

-0.00016 

7.41 

0.00112 

7.80 

0.00275 

8.19 

0.00678 

10 

+0.00107 

50 

-0.00020 

7.42 

0.00114 

7.81 

0.00281 

8.20 

0.00694 

11 

+0.00106 

51 

-0.00024 

7.43 

0.00117 

7.82 

0.00288 

8.21 

0.00710 

12 

+0.00104 

52 

-0.00028 

7.44 

0.00120 

7.83 

0.00295 

8.22 

0.00727 

13 

+0.00103 

53 

-0.00031 

7.45 

0.00123 

7.84 

0.00302 

8.23 

0.00744 

14 

+0.00101 

54 

-0.00035 

7.46 

0.00125 

7.85 

0.00309 

8.24 

0.00761 

15 

+0.00099 

55 

-0.00039 

7.47 

0.00128 

7.86 

0.00316 

8.25 

0.00779 

16 

+0.00097 

56 

-0.00043 

7.48 

0.00131 

7.87 

0.00323 

8.26 

0.00798 

17 

+0.00095 

57 

-0.00046 

7.49 

0.00134 

7.88 

0.00331 

8.27 

0.00816" 

18 

+0.00092 

58 

-0.00050 

7.50 

0.00138 

7.89 

0.00338 

8.28 

0.00835 

19 

+0.00090 

59 

-0.00054 

7.51 

0.00141 

7.90 

0.00346 

8.29 

0.00855 

20 

+0.00087 

60 

-0.00057 

7.52 

0.00144 

7.91 

0.00354 

8.30 

0.00875 

21 

+0.00085 

61 

-0.00060 

7.53 

0.00147 

7.92 

0.00363 

8.31 

0.00896 

22 

+0.00082 

62 

-0.00064 

7.54 

0.00151 

7.93 

0.00371 

8.32 

0.00917 

23 

+0.00079 

63 

-0.00067 

7.55 

0.00154 

7.94 

0.00380 

8.33 

0.00939 

24 

+0.00076 

64 

-0.00070 

7.56 

0.00158 

7.95 

0.00389 

8.34 

0.00961 

25 

+0.00073 

65 

-0.00073 

7.57 

0.00162 

7.96 

0.00398 

8.35 

0.00983 

26 

+0.00070 

66 

-0.00076 

7.58 

0.00165 

7.97 

0.00407 

27 

+0.00067 

67 

-0.00079 

7.59 

0.00169 

7.98 

0.00417 

28 

+0.00064 

68 

-0.00082 

7.60 

0.00173 

7.99 

0.00427 

29 

+0.00060 

69 

-0.00085 

7.61 

0.00177 

8.00 

0.00437 

30 

+0.00057 

70 

-0.00087 

7.62 

0.00181 

8.01 

0.00447 

31 

+0.00054 

71 

-0.00090 

7.63 

0.00186 

8.02 

0.00457 

32 

+0.00050 

72 

-0.00092 

7.64 

0.00190 

8.03 

0.00468 

33 

+0.00046 

73 

-0.00094 

7.65 

0.00194 

8.04 

0.00479 

34 

+0.00043 

74 

-0.00097 

7.66 

0.00199 

8.05 

0.00490 

35 

+0.00039 

75 

-0.00099 

7.67 

0.00204 

8.06 

0.00502 

36 

+0.00035 

76 

-0.00101 

7.68 

0.00208 

8.07 

0.00513 

37 

+0.00031 

77 

-0.00102 

7.69 

0.00213 

8.08 

0.00525 

38 

+0.00028 

78 

-0.00104 

7.70 

0.00218 

8.09 

0.00538 

39 

+0.00024 

79 

-0.00106 

40 

+0.00020 

80 

-0.00107 

D 


79 


CORRECTION 


FOR  THE  HOUR  OF  THE  DAY  AND  THE  SEASON  OF  THE  YEAR  AT  WHICH  THE 
OBSERVATIONS  HAVE  BEEN  TAKEN. 

IN  all  the  preceding  tables,  the  mean  temperature  of  the  layer  of  air  between  the 
two  stations  is  assumed  to  be  given  by  the  half-sum  of  the  temperatures  observed  at 
each  station,  or  by  — — .  Experience,  however,  has  proved  that  this  assumption  is  not 
true  under  all  meteorological  circumstances,  and  that,  not  to  speak  of  more  irregular 
influences,  the  temperature  expressed  by  ~T  differs  in  -4-  or  —  from  the  true  mean 
temperature  by  a  quantity  which  considerably  varies  with  the  hour  of  the  day,  the 
season  of  the  year,  and  the  elevation  at  which  the  observations  are  taken.  The 
amount  of  the  correction  for  the  temperature  of  the  air,  as  given  by  the  various 
formulas,  thus  needs  to  be  modified  accordingly.  In  the  absence  of  the  data  necessary 
for  establishing  the  law  of  the  decrease  of  heat  on  the  vertical  in  the  various  layers 
of  the  atmosphere,  at  the  different  periods  of  the  day  and  of  the  year,  and  at  differ- 
ent latitudes,  which  alone  would  furnish  the  means  of  determining  the  true  value  of 
this  correction  in  these  various  circumstances,  the  following  empirical  tables  enable 
us  to  form  a  judgment  of  the  importance  of  that  correction. 

Tables  IX.  and  X.  are  taken  from  Berghaus,  Grundriss  der  Geographic,  p.  91, 
and  in  the  Tables  accompanying  the  same  work,  p.  71.  The  correction  to  be  applied 
for  the  hour  of  the  day  at  which  the  observations  have  been  taken,  is  found  by  multi- 
plying the  approximate  height  obtained  by  the  factors  in  Table  IX.,  giving  to  the  cor- 
rection the  sign  of  the  factor.  This  table  and  the  following  are  calculated  to  be  used 
in  the  climate  of  Germany,  and  for  elevations  not  much  exceeding  5,000  feet.  The 
influence  of  the  seasons  on  the  correction  is  not  taken  into  the  account ;  judging  from 
Table  IX.,  the  correction  may  be,  perhaps,  too  small  for  the  summer  months,  and  may 
better  answer  for  the  autumn.  Using  these  factors,  we  obtain  for  the  differences  of 
level,  in  toises,  placed  at  the  head  of  each  column,  in  Table  X.,  the  correction  cor- 
responding to  each  hour,  from  6  A.  M.  to  10  P.  M. 

TABLE     IX. 

CORRECTION  FOR  THE  HOUR  OF  THE  DAY. 


Hour. 

Factor. 

Hour. 

Factor. 

Hour. 

Factor. 

A.  M.  6 

+0.0075 

Noon. 

-0.0054 

P.M.  5 

-0.0011 

7 

+0.0050 

P.  M.  1 

-0.0057 

6 

+0.0013 

8 

+0.0025 

2 

-0.0059 

7 

+0.0022 

9 

-0.0005 

3 

-0.0045 

8 

+0.0032 

10 

-0.0035 

4 

-0.0031 

9 

+0.0043 

11 

-0.0044 

5 

-0.0011 

10 

+0.0054 

D 


80 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 


TABLE     IX. 

CORRECTION    FOR   THE    HOUR    OF    THE    DAY. 
ARGUMENT,  THE  HOUR,  AND  THE  APPROXIMATE  HEIGHT  IN  TOISES. 


Correction,  in.  Toises,  for 

Hour. 

1OO 

200 

3OO 

400 

500 

600 

7OO 

§00 

9OO 

Hour. 

A.  M.   6 

+0.7 

+  1.5 

+2.2 

+3.0 

+3.7 

+4.5 

+5.2 

+6.0 

+6.7 

6A.M. 

7 

+0.5 

+1.0 

+  1.5 

+2.0 

+2.5 

+3.0 

+3.5 

+4.0 

+4.5 

7 

8 

+0.2 

+0.5 

+0.7 

+  1.0 

+1.2 

+1.5 

+1.8 

+2.0 

+2.3 

8 

9 

-0.0 

-0.1 

-0.1 

-0.2 

-0.2 

-0.3 

-0.3 

-0.4 

-0.4 

9 

10 

-0.3 

-0.7 

-  .0 

-1.4 

-2.1 

-2.4 

-2.8 

-3.1 

-3.5 

10 

11 

-0.4 

-0.9 

-  .3 

-1.8 

-2.2 

-2.7 

-3.1 

-3.6 

-4.0 

11 

Noon. 

-0.5 

-1.1 

-  .6 

-2.2 

-2.7 

-3.3 

-3.8 

-4.4 

-4.9 

Noon. 

P.  M.    1 

-0.6 

-1.1 

-  .7 

-2.3 

-2.8 

-3.4 

-4.0 

-4.5 

-5.1 

1P.M. 

2 

-0.6 

-1.2 

-  .8 

-2.4 

-3.0 

-3.5 

-4.1 

-4.7 

-5.3 

2 

3 

-0.4 

-0.9 

-  .3 

-1.8 

-2.2 

-2.7 

-31 

-3.6 

-4.0 

3 

4 

-0.3 

-0.6 

-0.9 

-1.2 

-1.5 

-1.8 

-2.1 

-2.4 

-2.7 

4 

5 

-0.1 

-0.2 

-0.3 

-0.4 

-0.5 

-0.6 

-0.7 

-0.8 

-0.9 

5 

6 

+0.1 

+0.2 

+0.4 

+0.5 

+0.5 

+0.8 

+0.9 

+1.0 

+1.1 

6 

7 

+0.2 

+0.4 

+0.7 

+0.9 

+  1.1 

+1.3 

+  1.6 

+1.8 

+2.0 

7 

8 

+0.3 

+0.6 

+0.9 

+  1.3 

+1.6 

+1.9 

+2.2 

+2.5 

+2.9 

8 

9 

+0.4 

+0.8 

+1.3 

+  1.7 

+2.1 

+2.6 

+3.0 

+3.4 

+3.8 

9 

10 

+0.5 

+1.1 

+1.6 

+2.1 

+2.7 

+3.2 

+2.8 

+4.3 

+4.8 

10 

Table  XL  is  found  in  the  Resume  des  Observations  Thermometrique  et  Barome- 
triques  faites  a  Geneve  et  au  Grand  St.  Bernard  pendant  les  dix  annees  1841  d  1850, 
a  very  elaborate  paper  by  Professor  E.  Plantamour,  Director  of  the  Observatory  at 
Geneva,  published  in  Vol.  XIII.  of  the  Memoires  de  la  Societe  de  Physique  de  Geneve. 
The  author,  after  having  determined  the  difference  of  elevation  between  Geneva 
(407.0  metres  above  the  level  of  the  sea)  and  the  Great  St.  Bernard,  by  means  of 
the  corresponding  observations,  made  during  these  10  years,  and  using  his  own  tables 
given  above,  reversed  the  problem.  Assuming  the  difference  of  level  thus  found, 
viz.  2066  metres,  to  be  the  true  height  of  the  layer  of  air  between  the  two  stations, 
and  its  weight  being  given  by  the  barometrical  observations,  he  deduced  from  these 
data  its  mean  density,  and  from  the  density  its  mean  temperature  at  every  even 
hour  in  every  month  of  the  year.  Comparing  these  mean  temperatures  with  those 
given  at  the  same  hours  by  the  half-sum  of  the  temperatures  taken  at  the  upper  and 
the  lower  station,  he  found  the  differences  contained  in  Table  XL,  which  are  the  cor- 
rections to  be  applied  to  the  half-sums  of  the  temperatures  to  obtain,  in  this  particular 
case,  the  true  mean  temperatures.  The  second  part  of  the  table  has  been  computed 
by  multiplying  each  temperature  in  the  first  by  7.5  metres,  in  order  to  show  the  value 
of  that  correction  in  barometrical  measurements. 

D  81 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 


TABLE     XI. 


CORRECTION  TO  BE  APPLIED  TO  THE  HALF-SUMS  OF  THE  TEMPERATURES  OF  THE  AIR, 
OBSERVED  AT  GENEVA  AND  AT  THE  GREAT  ST.  BERNARD,  TO  OBTAIN  THE  TRUE 
MEAN  TEMPERATURE  OF  THE  AIR  BETWEEN  THE  TWO  STATIONS. 


Correction,  in  Centigrade  Degrees,  for 

Hour. 

Jan.        Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

NOT. 

Dec. 

Year. 

o 

0 

0 

0 

o 

o 

0 

o 

0 

o 

o 

o 

o 

Noon. 

-0.5 

-1.7 

-3.0 

-3.9 

-4.1 

-4.4 

-4.4 

-3.8 

-2.7 

-1.6 

-0.4 

+0.7 

-2.5 

2 

-0.2 

-1.5 

-2.8 

-3.7 

-4.0 

-4.4 

-4.4 

-3.8 

-2.6 

-1.5 

-0.2 

+0.7 

-2.3 

4 

+0.4 

-0.6 

-1.6 

-2.5 

-2.7 

-3.4 

-3.6 

-2.9 

-1.7 

-0.7 

+0.4 

+  1.3 

-1.5 

6 

+1.2 

+0.7 

-0.2 

-0.9 

-1.3 

-2.1 

-2.2 

-1.6 

-0.5 

+0.4 

+  1.3 

+2.1 

-0.3 

8 

+1.5 

+  1.4 

+0.6 

0.0 

0.0 

-0.6 

-0.7 

-0.5 

+0.3 

+1.3 

+  1.7 

+2.6 

+0.6 

10 

+  1.7 

+1.5 

+  1.2 

+0.6 

+0.7 

+0.5 

-0.1 

+0.1 

+0.8 

+  1.7 

+1.8 

+2.6 

+1.1 

Mid- 

night. 

+1.9 

+1.8 

+1.9 

+1.3 

+  1.8 

+  1.6 

+0.9 

+  1.2 

+1.3 

+2.3 

+2.1 

+2.5 

+1.7 

2 

+2.0 

+2.2 

+2.5 

+  1.9 

+2.2 

+2.0 

+  1.5 

+2.0 

+  1.9 

+2.5 

+2.4 

+2.6 

+2.2 

4 

+2.3 

+2.5 

+2.6 

+  1.8 

+  1.7 

+1.4 

+1.1 

+1.8 

+2.1 

+2.5 

+2.7 

+2.9 

+2.1 

6 

+2.0 

+2.0 

+1.7 

+0.7 

+0.4 

+0.1 

0.0 

+0.7 

+1.5 

+1.7 

+2.3 

+2.9 

+  1.3 

8 

+  1.5 

+  1.1 

0.0 

-1.3 

-2.0 

-2.2 

-2.4 

-1.7 

-0.4 

+0.6 

+  1.7 

+2.5 

-0.3 

10 

+0.4 

-0.4 

-2.0 

-3.1 

-3.5 

-3.8 

-3.7 

-3.1 

-2.0 

-1.0 

+0.3 

+1.3 

-1.7 

Mean, 

+1.2 

+0.8 

+0.1 

-0.8 

-0.9 

-1.2 

-1.5 

-0.9 

-0.2 

+0.7 

+1.3 

+2.1 

0.0 

Correction,  in  Metres,  for 

Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov.       Dec. 

Year. 

Noon. 

-  3.7 

-12.7 

-22.5 

-29.2 

-30.7 

-33.0 

-33.0 

-28.5 

-20.2 

-12.0  -  3.0   +  5.2 

-18.7 

2 

-  1.5 

-11.2 

-21.0 

-27.7 

-30.0 

-33.0 

-33.0 

-28.5 

-19.5 

-11.2  -  1.5  +  5.2 

-17.2 

4 

+  3.0 

-  4.5 

-12.0 

-18.7 

-20.2 

-25.5 

-27.0  -21.7 

-12.7 

-  5.2  +  3.0   +  9.7 

-11.2 

6 

+  9.0 

+  5.2 

-  1.5 

-  6.7 

-  9.7 

-15.7 

-16.5  -12.0 

-  3.7 

+  3.0 

+  9.7  +15.7 

-  2.2 

8 

+11.2 

+10.5 

+  4.5 

0.0 

0.0 

-  4.5 

-  5.2  -  3.7 

+  2.2 

+  9.7 

+12.7+19.5 

+  4.5 

10 

+  12.7 

+11.2 

+  9.0 

+  4.5 

+  5.2 

+  3.7 

-  0.7 

+  0.7 

+  6.0 

+12.7 

+13.5 

+  19.5 

+  8.5 

Mid- 
night. 

+14.5 

+13.5 

+14.5 

+  9.7 

+13.5 

+12.0 

+  6.7 

+  9.0 

+  9.7 

+17.2 

+15.7 

+18.7 

+12.7 

2 

+  15.0 

+16.5 

+  18.7 

+14.2 

+16.5 

+  15.0 

+11.2 

+  15.0 

+14.2 

+18.7  +18.0  +19.5 

+  16.5; 

4 

+17.2 

+18.7 

+19.5 

+13.5 

+12.7 

+  10.5 

+  8.2 

+13.5 

+15.7 

+18.7  +20.2  +21.7 

+  13.7 

6 

+  15.0 

+15.0 

+12.7 

+  5.2 

+  3.0 

+  0.7 

0.0 

+  5.2 

+  11.2 

+12.7 

+17.2 

+21.7 

+  9.7 

8 

+  11.2 

+  8.2 

0.0 

-  9.7 

-15.0 

-16.5 

-18.0 

-12.7 

-  3.0 

+  4.5 

+12.7 

+  18.7 

-  2.2 

10 

+  3.0 

-  3.0 

-15.0 

-23.2 

-26.2 

-28.5 

-27.7 

-23.2 

-15.0 

-  7.5 

+  2.2 

+  9.7 

-12.7 

Mean, 

+9.0 

+6.0 

+0.7 

-6.0 

-6.7 

-9.0 

-11.2 

-6.7 

-1.5 

.+5.2 

+9.7 

+  15.7 

0.0 

D 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

THE  elevation  of  a  place  in  the  interior  of  a  continent  where  regular  meteorological 
observations  are  made,  may  be  ascertained  by  taking  the  yearly  means  of  the  ba- 
rometer reduced  to  the  freezing  point,  and  of  the  temperature  of  the  air,  as  data  for 
the  upper  station,  and  the  yearly  means  of  the  reduced  barometer  and  of  the  free 
thermometer  at  the  level  of  the  sea,  as  the  data  for  the  lower  station.  The  Hypso- 
metric Tables  then  will  give  the  difference  of  level.  As  observation,  however,  has 
shown  that  the  mean  height  of  the  barometer  at  the  level  of  the  sea  is  not  the  same 
in  all  latitudes,  it  is  necessary  to  take  for  such  a  comparison  the  mean  height  of  the 
barometer  which  belongs  to  the  latitude  of  the  station  the  elevation  of  which  is  to  be 
computed,  or  that  which  is  nearest  to  it. 

Table  XII.,  published  by  Schouw,  in  Poggendorf's  Annalen,  and  in  the  Comptes 
Rendus  de  P  Academic  ties  Sciences,  Tom.  III.  p.  573,  gives  in  Paris  lines  the  mean 
height  of  the  barometer  in  various  latitudes.  The  reduction  into  millimetres  is 
from  Marlins's  French  translation  of  Kaemtz's  Meteorology,  p.  278  ;  the  correspond- 
ing values  in  English  inches,  and  the  new  stations,  Savannah,  Ga.,  Philadelphia,  Pa., 
and  Cambridge,  Mass.,  have  been  added.  The  mean  heights  last  mentioned  have 
been  derived  from  three  years  of  observations  at  Savannah,  by  Dr.  John  F.  Posey, 
from  June,  1853,  to  June,  1856,  published  in  the  American  Almanac;  from  four 
years  of  hourly  observations  at  Girard  College,  Philadelphia,  by  Prof.  A.  D.  Bache  ; 
and  from  ten  years  of  observations  at  Cambridge  Observatory.  They  have  been 
reduced  to  a  common  absolute  standard  and  to  mean  tide-water  at  the  respective 
places. 

These  mean  barometric  heights,  corrected  for  the  variation  of  gravity  in  latitude, 
according  to  the  proposition  of  Poggendorf,  by  the  formula  I  =  b  45  (1  —  0.0025935 
cos  2  </>),  where  b  is  the  height  of  the  barometer  in  latitude  <£,  and  b  45  the  corre- 
sponding height  at  the  forty-fifth  degree  of  latitude,  are  found  in  another  column. 
For  computing  the  elevations,  the  uncorrected  heights  are  to  be  used. 

The  mean  barometric  pressure,  as  shown  by  Table  XIII.  from  Kaemtz's  Precis  de 
Meteorologie,  French  translation,  p.  281,  is  not  the  same  in  all  seasons,  and  the 
monthly  means  differ  by  a  quantity  which  also  varies  with  the  latitude.  If,  therefore, 
the  height  of  an  inland  station  is  to  be  ascertained  frorn  the  barometrical  means  of 
one  or  more  months  only,  the  computation  must  be  made  with  the  mean  pressure  in 
the  corresponding  months  at  the  level  of  the  sea ;  or  if  this  is  not  known,  the  yearly 
means  taken  from  Table  XII.  must  be  corrected  for  the  difference  between  the  monthly 
means  of  the  given  month,  or  months,  and  the  annual  mean  in  the  same  latitude,  as 
derived  from  the  comparison  of  the  numbers  in  Table  XIII. 

Example. 

Suppose  an  inland  station,  in  latitude  40°  N.  ;  the  mean  barometric  pressure  for 
July  is  26.30  inches,  and  its  elevation  is  to  be  computed  from  it. 

Table  XII.  gives  for  latitude  40°,  at  Philadelphia,  reduced  to  the  level  of  the  sea, 
30.053  inches.  Table  X11I.  gives  for  the  mean  for  July,  at  the  same  place,  759.80 
millimetres,  and  for  the  year,  760.25  millimetres  (both  not  reduced  to  the  level  of 
the  sea),  difference  —  0.45  millimetres  =  —  0.017  English  inches,  which  is  to  be 
subtracted  from  the  annual  mean,  30.053,  to  reduce  it  to  the  mean  of  July ;  or 

D  83 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

30.053  —  0.017  =  30.036.  This  last  number  is  to  be  used  in  the  computation, 
with  the  mean  temperature  of  July  at  both  stations. 

Towards  the  tropical  regions,  the  irregular  or  non-periodic  variations  of  the  ba- 
rometer, which  in  high  and  middle  latitudes  are  so  considerable  as  to  render  simul- 
taneous observations  indispensable  for  the  measurement  of  heights,  gradually  decrease 
and  nearly  cease  to  exist,  while  the  monthly  and  daily  periodic  variations,  which  are 
small  in  high  latitudes,  considerably  increase.  Within  the  tropics,  therefore,  the 
oscillations  of  the  barometer  being  far  more  uniform,  observations  made  during  a 
short  period  of  time,  or  even  single  observations,  may  be  Used  for  computing  heights, 
without  corresponding  observations,  by  referring  them  to  the  mean  pressure  at  the 
level  of  the  sea  as  to  a  constant,  provided  this  last  has  been  corrected  for  the  monthly 
and  daily  periodic  variation  at  the  place. 

Table  XIII.  furnishes  the  means  of  applying  the  correction  for  the  monthly  varia- 
tion, as  described  above.  Table  XIV.,  which  gives  the  mean  height  of  the  barometer 
at  all  hours  of  the  day  \n  various  latitudes,  enables  the  observer  to  correct  the  data 
according  to  the  hour  at  which  the  observations  have  been  taken.  This  table  is 
from  Kaemtz's  Vorlesungen  uber  Meteorologie,  French  translation,  p.  249.  The 
column  Bossekop  is  from  the  observations  of  the  French  Scientific  Expedition  in  the 
North ;  the  column  Philadelphia,  from  the  observations  at  Girard  College,  has  been 
added. 

The  correction  for  the  hourly  variation  is  found  by  taking  the  difference  between 
the  mean  of  the  hour  of  observation  and  the  daily  mean,  and  correcting  accordingly, 
with  due  regard  to  the  signs,  either  the  yearly  mean  at  the  sea  level,  or  the  observa- 
tion at  the  upper  station. 

Example. 

The  barometer  at  Caracas,  latitude  10°  30'  N.,  on  the  20th  of  August,  at  4  o'clock 
P.  M.,  reads  680.57  millimetres. 

In  Table  XII,  the  mean  height  of  the  barometer  at 

La  Guayra,  lat.  10°  N =  760.17  millimetres, 

By  Table  XIII.  we  find  for*  August  a  correction     .         .  =  —     2.95 

Mean  barometer  in  August       .....=       757.22 

In  Table  XIV.  daily  mean  —  mean  at  4  P..  M.  gives  for 

4  P.  M.  a  correction  '.  .  ,  .  .  .  .  =  —  1.17 

Mean  barometer  at  La  Guayra  in  August,  at  4  P.  M.  =      756.05  millimetres, 

which  is  the  number  to  be  used  for  the  computation  of  the  height  of  Caracas.  In 
this  case,  however,  the  monthly  correction,  being  derived  from  a  higher  latitude,  may 
be  too  small.  Both  corrections  can  of  course  be  applied,  with  contrary  signs,  to  the 
observation  at  Caracas,  leaving  then  the  mean  height  at  the  level  of  the  sea  as  a 
constant. 


D  84 


TABLE     XII. 
MEAN  HEIGHT   OF  THE  BAROMETER, 

IN  VARIOUS  LATITUDES,  REDUCED  TO  THE  LEVEL  OF  THE  SEA,  AND  TO  THE 

FREEZING  POINT. 


Places. 

Latitude. 

In  Millimetres. 

In  English  Inches. 

In  Paris  Lines. 

Observed. 

Corrected 
for 
Gravity. 

Observed. 

Corrected 
for 
Gravity. 

Observed. 

Corrected 
for 
Gravity. 

O      ; 

Cape  of  Good  Hope, 

33       S. 

763.01 

762.20 

30.041 

30.008 

338.24 

337.88 

Rio  Janeiro,  Brazil, 

23       S. 

764.03 

762.65 

30.080 

30.026 

338.69 

338.08 

1  Christiansborg,  Guinea, 

5  SON. 

760.10 

758.16 

29.925 

'  29.850 

336.95 

336.09 

i  La  Guayra,  Venezuela, 

10 

760.17 

758.32 

29.928 

29.855 

336.98 

336.16 

j  St.  Thomas,  W.  Indies, 

19 

760.51 

758.95 

29.942 

29.881 

337-13 

336.44 

Macao,  China, 

23 

762.99 

761.61 

30.040 

29.986 

338.23 

337.62 

Teneriffe,  Canary  Isles, 

28 

764.21 

763.10 

30.087 

30.044 

338.77 

338.28 

Savannah,  Georgia, 

32 

764.59 

763.74 

30.102 

30.070 

338.93 

338.57 

Funchal,  Madeira, 

32  30 

765.18 

764.34 

30.126 

30.093 

339.20 

338.83 

Tripoli,  Northern  Africa, 

33 

767.41 

766.60 

30.214 

30.182 

340.19 

339.83 

Palermo,  Sicily, 

33 

762.95 

762.47 

30.038 

30.019 

338.21 

338.00 

Philadelphia,  Penn. 

40 

763.35 

763.00 

30.053 

30.040 

338.38 

338.23 

Naples,  Italy, 

41 

762.34 

762.06 

30.014 

30.003 

337.94 

337.82 

Cambridge,  Mass. 

42 

762.44 

762.24 

30.018 

30.010 

337.99 

337.90 

Florence,  Italy, 

43  30 

761.93 

761.81 

29.997 

29.993 

337.76 

337.71 

Avignon,  France, 

44 

762.02 

761.95 

30.001 

29.998 

337.80 

337.77 

Bologna,  Italy, 

44  30 

762.18 

762.13 

30.007 

30.005 

337.87 

337.85 

Padua,  Italy, 

45 

762.18 

762.18 

30.007 

30.007 

337.87 

337.87 

Paris,  France, 

49 

761.41 

761.68 

29.978 

29.988 

337.53 

337.65 

London,  England, 

51  30 

760.96 

761.41 

29.960 

29.978 

337.33 

337.53 

Altona,  Denmark, 

53  30 

760.42 

761.01 

29.938 

29.961 

337.09 

337.35 

Dantzig,  Prussia, 

54  30 

760.10 

760.76 

29.925 

29.952 

336.95 

337.24 

Konigsberg,  Prussia, 

54  30 

760.49 

761.14 

29.941 

29.967 

337.12 

337.41 

Apenrade,  Denmark, 

55 

759.58 

760.71 

29.906 

29.950 

336.72 

337.22 

Edinburgh,  Scotland, 

56 

758.25 

759.00 

29.853 

29.882 

336.13 

336.46 

Christiania,  Norway, 

60 

758.64 

759.63 

29.868 

29.908 

336.30 

336.74 

Hardanger,  Norway, 

60 

756.94 

757.04 

29.801 

29.841 

335.55 

335.99 

Bergen,  Norway, 

60 

757.01 

758.00 

29.804 

29.844 

335.58 

336.02 

Reikiavig,  Iceland, 

64 

752.00 

753.20 

29.607 

29.654 

333.36 

333.89 

Godthaab,  S.  Greenland, 

64 

751.94 

753.13 

29.605 

29.651 

333.33 

333.86 

Eyafiord,  Iceland, 

66 

753.58 

754.89 

29.669 

29.721 

334.06 

334.64 

Godhavn,  Disco,  Greenl. 

68 

753.76 

755.16 

29.677 

29.731 

334.14 

334.76 

Upemavik,  N.  Greenl. 

73 

755.18 

756.80 

29.732       29.796 

334.77 

335.49 

Melville  Isl.,  Arct.  Amer 

74  30 

757.08 

758.75 

29.807       29.872 

335.61 

336.35 

Spitzbcrgen, 

75  30 

756.76 

758.48 

29.794       29.862 

335.47 

336.23 

D 


85 


XIII.     MEAN    HEIGHT    OF  THE    BAROMETER,    IN    ALL    MONTHS    OF    THE    YEAR,    IN 

VARIOUS    LATITUDES. 

Not  reduced  to  the  Level  of  the  Sea. 


Places, 

CAL- 

C 

SA- 

PHILA- 

CAM- 

PARIS. 

ST.  PE- 

Latitude, 

23°  9' 

22°  33' 

22°  11' 

30°  2' 

32°  5' 

39°  58' 

BRIDGE1. 

42°  23' 

48°  50' 

TER3HURG. 

59°  56' 

Jan. 

765.24 

764.57 

767.93 

762.40 

762.80 

760.97 

761.37 

758.86 

762.54 

Feb. 

760.15 

758.86 

767.01 

it 

763.76 

759.63 

760.90 

759.09 

763.10 

March, 

760.98 

756.24 

766.08 

759.43 

763.05 

760.51 

759.09 

756.33 

760.76 

April, 

759.58 

753.83 

761.93 

760.10 

763.10 

760.05 

759.37 

755.18 

761.19 

May, 

758.19 

750.81 

761.64 

758.23 

763.39 

759.09 

759.63 

755.61 

760.94 

June, 

760.67 

748.10 

757.31 

754.42 

764.37 

759.22 

758.91 

757.28 

759.83 

July, 

760.67 

747.54 

757.91 

753.90 

764.02 

759.80 

760.34 

756.52 

758.25 

Aug. 

757.33 

748.53 

757.91 

754.06 

765.54 

760.54 

761.11 

756.74 

759.94 

Sept. 

757.46 

751.83 

762.22 

756.70 

763.36 

761.25 

761.83 

756.61 

761.19 

Oct. 

758.19 

755.25 

763.37 

759.70 

763.13 

760.68 

761.07 

754.42 

760.82 

Nov. 

761.25 

758.37 

766.17 

760.76 

763.41 

760.49 

760.85 

755.75 

758.05 

Dec. 

763.62 

760.59 

768.65 

761.82 

761.12 

760.82 

760.80 

755.09 

760.22 

Year, 

760.28 

754.54 

763.18 

758.32 

763.41 

760.25 

760.41 

756.46 

760.57 

XIV.      MEAN    HEIGHT    OF    THE    BAROMETER,    AT    ALL    HOURS    OF    THE    DAY,    IN 

VARIOUS    LATITUDES. 

Not  reduced  to  the  Level  of  the  Sea. 

Places, 

PACIFIC 
OCEAN. 

CUMANA. 

LA 

GUAYRA. 

CAL- 
CUTTA. 

PHILADEL- 
PHIA. 

PADUA. 

HALLE 

ST.  PE- 
TERSBURG 

BOSSEKOP. 

Latitude, 

0°  0' 

10°  28'w. 

10°  36'N. 

22°  35'N. 

39°  58'N. 

45°  24'x. 

51°  29'N. 

59°  56'N. 

G9°  58'N. 

Observers, 

Homer. 

Hum- 

boldt. 

Boussin- 
gault. 

Balfour 

Bache 

Ciminello. 

Kaemtz 

Kupffer. 

Bravais. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Midnight, 

752.47 

756.86 

759.64 

758.80 

760.49 

757.01 

753.23 

759.35 

754.90 

1 

752.20 

756.53 

759.34 

758.62 

760.46 

756.90 

753.14 

«  it 

it 

2 

751.77 

756.21 

759.05 

758.57 

760.41 

756.84 

753.05 

759.32 

754.79 

3 

751.63 

755.89 

758.81 

758.49 

760.34 

756.78 

752.99 

u 

u 

4 

751.32 

755.66 

758.68 

758.47 

760.39 

756.74 

752.99 

759.32 

754.70 

5 

751.65 

755.79 

758.85 

758.44 

760.49 

756.75 

753.34 

a 

u 

6 

751.95 

756.18 

759.32 

758.68 

760.75 

756.79 

753.12 

759.39 

754.68 

7 

752.48 

756.58 

759.94 

759.16 

761.00 

756.89 

753.24 

it 

it 

8 

752.95 

756.98 

760.50 

759.88 

761.15 

757.01 

753.37 

759.49 

754.75 

9 

753.16 

757.31 

759.63 

760.11 

761.22 

757.08 

753.44 

a 

u 

10 

753.15 

757.32 

760.50 

760.19 

761.17 

757.14 

753.46 

759.51 

754.96 

11       '  752.80 

757.01 

759.99 

760.09 

760.97 

757.07 

753.40 

u 

M 

Noon, 

752.35 

756.57 

759.41 

759.61 

760.56 

757.02 

753.29 

759.47 

755.01 

1 

751.87 

755.99 

758.91 

759.22 

760.13 

756.85 

753.11 

u 

u 

2 

751.55 

755.47 

758.41 

758.39 

759.83 

756.67 

752.99 

759.38 

754.96 

3 

751.15 

755.14 

758.12 

758.12 

759.65 

756.54 

752.89 

1C 

u 

4 

751.02 

754.96 

758.05 

757.91 

759.65 

756.47 

753.84 

759.32 

754.82 

5 

751.31 

755.14 

758.10 

757.93 

759.70 

756.46 

752.86 

u 

a 

6 

751.71 

755.41 

758.40 

758.01 

759.85 

756.50 

752.91 

759.31 

754.87 

7 

751.93 

755.81 

758.90 

758.02 

760.08 

756.63 

753.02 

(t 

u 

8 

752.35 

756.21 

759.19 

758.54 

760.31 

756.79 

753.14 

759.32 

754.89 

9 

752.74 

756.59 

759.69 

759.24 

760.49 

756.92 

753.24 

u 

a 

10 

752.85 

756.87 

759.93 

759.33 

760.59 

757.02 

753.31 

759.36 

754.92 

11 

752.86 

757.15 

759.98 

759.09 

760.72 

757.02 

753.29 

(t 

n 

|    Mean, 

752.13      756.33 

759.22 

758.87 

760.43 

756.83 

753.19 

759.38 

754.85 

D 


86 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 


TABLE  XIV.  shows  that,  after  all  irregular  variations  of  the  barometer  have  been 
eliminated,  there  remains  a  double  period  of  rise  and  fall  within  the  twenty-four 
hours,  and  that  the  amplitude  of  these  daily  oscillations  is  greatest  within  the  tropics, 
and  goes  on  diminishing  towards  the  polar  regions. 

According  to  Kaemtz,  the  mean  time  of  the  daily  maxima  and  minima,  or  the 
mean  tropic  hours  for  the  northern  hemisphere,  are  as  follows :  — 

h. 

The  minimum  of  the  afternoon  is  reached  at  4.05  P.  M. 

The  maximum  of  the  evening  is  reached  at  10.11  P.M. 

•       The  minimum  of  the  night  is  reached  at  3.45  A.  M. 

The  maximum  of  the  morning  is  reached  at  9.37  A.  M. 

Even  in  temperate  and  high  latitudes  these  diurnal  variations,  though  small,  must  be 
taken  into  account,  if  great  accuracy  is  required,  in  reducing  corresponding  obser- 
vations made  at  a  somewhat  different  hour  to  the  time  of  the  observation  at  the 
station  the  height  of  which  is  to  be  determined.  But  in  so  doing,  it  must  be  remem- 
bered that  the  tim-es  of  the  minima  and  max.ima  change  with  the  seasons,  as  is  shown 
by  Table  XV.  from  Kaemtz,  p.  251  of  the  French  translation. 


xv. 


TROPIC    HOURS    OF    THE    DAILY    VARIATION    OF    THE    BAROMETER   AT    HALLE. 
LAT.    51°  30'  N. 


Month. 

Minimum, 
P.  M. 

Maximum, 
P.M. 

Minimum,  Maximum. 
A.  M.           A.  M. 

Month. 

Minimum, 
P.M. 

Maximum, 
P.  M. 

Minimum, 
A.M. 

Maximum, 
A.  M. 

h. 

h.                 h. 

h. 

h. 

h. 

h. 

h. 

Jan. 

2.81 

9.17 

4.91 

9.91 

July, 

5.21 

11.04 

3.04 

8.73 

Feb. 

3.43 

9.46 

3.86 

9.66 

Aug. 

4.86 

10.66 

3.06 

8.96 

March, 

3.82 

9.80 

3.87 

10.10 

Sept. 

4.55 

10.45 

3.45 

9.71 

April, 

4.46 

10.27 

3.53 

9.53 

Oct. 

4.17 

10.24 

3.97 

10.07 

May, 

5.43 

10.93 

3.03 

9.13 

Nov. 

3.52 

9.85 

4.68 

10.08 

June, 

5.20     1    10.93 

2.83 

8.73 

Dec. 

3.15 

9.11 

4.91 

10.18 

This  shifting  of  the  times  of  maxima  and  minima  with  the  seasons  diminishes  with 
the  latitude,  and  tends  to  disappear  towards  the  equator,  with  the  inequality  of  the 
days  and  nights.  The  elevation  above  the  level  of  the  sea  also  causes  a  change  in 
the  tropic  hours  of  the  daily  variation  which  is  not  yet  sufficiently  studied. 

Table  XIV.  gives  evidence  that  the  amplitude  of  the  hourly  oscillation  is  greatest 
under  the  equator,  and  gradually  decreases  towards  the  pole.  Kaemtz  computes  its 
mean  value  in  various  latitudes  and  at  the  level  of  the  sea,  as  follows :  — 

XV'.       AMPLITUDE    OF    DAILY    VARIATIONS    IN    VARIOUS    LATITUDES. 


Latitude. 

Variation. 

Latitude. 

Variation. 

Latitude. 

Variation. 

Latitude 

Variation. 

0         1 

0     0 

Millim. 
2.28 

o      / 
23  55 

Millim. 
1.80 

0       / 

39     4 

Millim. 
1.13 

0       t 

52  33 

Millim. 
0.45 

5  26  N. 
17  52 

2.26 

2.03 

29  28 
34  26 

1.58 
1.35 

43  34 

48     1 

0.90 
0.67 

57  17 
62  25 

0.23 
0.00 

The  amplitude  also  decreases  with  the  elevation,  at  least  in  our  latitudes  ;  it  was 
found  to  be  on  the  Faulhorn,  in  Switzerland,  9000  feet  above  the  sea  level, 
0.27  millimetres,  while  it  was  0.90  millimetres  at  Geneva. 

D  87 


TABLES 

FOR  REDUCING  BAROMETRICAL  OBSERVATIONS  TO  THE  LEVEL  OF  THE  SEA,  OR  TO 

ANOTHER  LEVEL. 

To  reduce  barometric  means  taken  at  a  given  elevation  to  the  height  they  would 
have  if  taken  at  the  level  of  the  sea,  or  barometric  observations  made  at  different 
elevations  to  a  common  level,  in  order  to  eliminate  the  influence  of  altitude  in  the 
comparison  of  barometric  pressures,  is  a  problem,  the  solution  of  which  is  often 
needed  in  meteorology. 

For  a  complete  and  accurate  reduction,  embracing  all  cases,  Tables  IV.  and  V., 
by  Dippe,  given  above,  pages  54  et  seq.,  maybe  used.  But  when  the  difference  of 
height  between  the  two  stations,  or  above  the  sea-level,  does  not  exceed  a  few 
hundred  feet,  the  small  tables  XVI.  to  XIX.,  in  three  different  scales,  will  be  found 
more  convenient. 

Tables  XVI.  and  XVII.  have  been  computed  from  the  constants  of  Laplace's  for- 
mula, the  barometric  coefficient,  including  the  correction  for  the  decrease  of  gravity 
on  a  vertical,  being  respectively  60,345.51  English  feet  and  56,621.83  Paris  feet ; 
and  the  coefficient  for  expansion  of  moist  air  0.004. 

In  Table  XVIII.  the  coefficient  1&,420  metres,  deduced  from  Regnault's  experi- 
ments (see  Proceedings  of  the  Amer.  Assoc.for  Adv.  of  Science,  1857),  and  his  co- 
efficient for  expansion  of  dry  air,  0.003665,  increased  to  0.0039,  in  order  to  include 
the  action  of  moisture,  have  been  used. 

USE  OF  THE  TABLES. 

The  correction  for  reducing  the  barometer  to  the  level  of  the  sea  is  found  by  the 
formula 

C  -  /  x  ll' 
"N  X  *' 

where  C  is  the  correction  required  ;  /,  the  elevation  of  the  station  ;  N,  the  number 
in  the  tables ;  7i',  the  reading  of  the  barometer ;  7t,  the  normal  height  of  barometer 
at  the  sea-level. 

Example. 

At  Cambridge  Observatory,  Massachusetts,  at  71.34  English  feet  above  mean  tide, 
the  mean  barometer  is  =  29.939  inches  ;  the  mean  temperature  47°. 3  Fahrenheit ; 
what  would  be  the  height  at  the  level  of  the  sea  ? 

In  Table  XVI.  we  take  for  47°.3  —  90.49,  or,  in  order  to  get  the  correction  in  a 
fraction  of  an  inch,  904.9. 

Then 

71.34         29.939         A  --,-  .  .      , 

C  "  a"     a  x  —55-  =  °-079>  correction  required  ; 
yu4.y  ou 

and 
29.939  +  0.079  —  30.018  inches,  height  of  the  barometer  at  the  level  of  the  sea. 

It  will  be  seen  that  the  quantity  represented  by  the  second  member  can  be  neg- 
lected without  causing  a  sensible  error  in  the  correction.  In  this  case  the  error  does 
not  amount  to  .001  ;  it  scarcely  would  reach  .002  for  250  feet  of  elevation  ;  so  that 

the  reduction  can  be  made  in  most  cases  by  a  simple  division  ;  viz.  ~. 
D  88 


XVI.   HEIGHT,  IN  ENGLISH  FEET,  OF  A  COLUMN  OF  AIR  CORRESPONDING  TO  A  TENTH  OF 
AN  ENGLISH  INCH  IN  THE  BAROMETER,  AT  TEMPERATURES  BETWEEN 

32°  AND  100°  FAHRENHEIT, 
The  Barometric  Pressure  at  the  Lower  Station  being  =  30  English  Inches. 


Temper- 
ature of 
Air, 
Fahren. 

Height 
in 
English 
Feet. 

Temper- 
ature of 
Air, 
Fahren. 

Height 
in 
English 
Feet. 

Temper- 
ature of 
Air, 
Fahren. 

Height 
in 
English 
Feet. 

Temper- 
ature of 
Air, 
Fahren. 

Height 
in 
English 
Feet. 

Temper- 
ature of 
Air, 
Fahren. 

Height 
in 
English 
Feet. 

32° 

87.51 

46° 

90.23 

60° 

92.95 

74° 

i)5.67 

87° 

98.20- 

33 

87.70 

47 

90.42 

61 

93.15 

75 

95.87 

88 

98.40 

34 

87.90 

48 

90.62 

62 

93.34 

76 

96.06 

89 

98.59 

35 

88.09 

49 

90.81 

63 

93.53 

77 

96.26 

90 

98.79 

36 

88.28 

50 

91.01 

64 

93.73 

78 

96.45 

91 

98.98 

37 

88.48 

51 

91.20 

65 

93.92 

79 

96.65 

92 

99.17 

38 

88.67 

52 

91.40 

66 

94.12 

80 

96.84 

93 

99.37 

39 

88.87 

53 

91.59 

67 

94.31 

81 

97.04 

94 

99.56 

40 

89.06 

54 

91.78 

68 

94.51 

82 

97.23 

95 

99.76 

41 

89.26 

55 

91.98 

69 

94.70 

83 

97.42 

96 

99.95 

42 

89.45 

56 

92.17 

70 

94.90 

84 

97.62 

97 

100.15 

43 

89.65 

57 

92.37 

71 

95.09 

85 

97.81 

98 

100.34 

44 

89.84 

58 

92.56 

72 

95.29 

86 

98.01 

99 

100.54 

45 

90.03 

59 

92.76 

73 

95.48 

87 

98.20 

100 

100.73 

XVII.      HEIGHT,    IN     FRENCH    FEET,    OF    A    COLUMN     OF     AIR     CORRESPONDING-    TO 

A    PARIS     LINE     IN     THE     BAROMETER,     AT     TEMPERATURES     OF     THE     AIR 
BETWEEN    0°    AND   34°    REAUMUR, 

The  Barometric  Pressure  at  the  Lower  Station  being  =  337  Paris  Lines. 

Temper- 
ature of 
Air, 
Reaumur. 

Height 
in 
French 
Feet. 

Temper- 
ature of 
Air, 
Reaumur. 

Height 
in 
French 
Feet. 

Temper- 
ature of 
Air, 
Reaumur. 

Height 
in 
French 
Feet. 

Temper- 
ature of 
Air, 
Reaumur. 

Height 
in 
French 
Feet. 

Temper- 
ature of 
Air, 
Reaumur. 

Height 
in 
French 
Feet. 

0° 

73.08 

7° 

75.63 

14° 

78.19 

21° 

80.75 

28° 

83.31 

1 

73.44 

8 

76.00 

15 

78.56 

22 

81.11 

29 

83.67 

2 

73.81 

9 

76.36 

16 

78.92 

23 

81.48 

30 

8'4.04 

3 

74.17 

10 

76.73 

17 

79.29 

24 

81.85 

31 

84.40 

4 

74.54 

11 

77.10 

18 

79.65 

25 

82.21 

32 

84.77 

5 

74.90 

12 

77.46 

19 

80.02 

26 

82.58 

33 

85.13 

6 

75.27 

13 

77.83 

20 

80.38 

27 

82.94 

34 

85.50 

XVIII.    HEIGHT,     IN     METRES,     OF     A     COLUMN      OF     AIR     CORRESPONDING     TO     A 

MILLIMETRE    IN    THE    BAROMETER,  AT  TEMPERATURES    BETWEEN 
0°    AND   39°    CENTIGRADE, 

The  Barometric  Pressure  at  the  Lower  Station  being  =  760  Millimetres. 

Temper- 
ature of 
Air, 
Centigr 

Height 
in 
Metres. 

Temper- 
ature of 
Air, 
Centigr. 

Height 
in 
Metres. 

Temper- 
ature of 
Air, 
Centigr. 

Height 
in 
Metres. 

Temper- 
ature of 
Air, 
Centigr. 

Height 
in 
Metres. 

Temper- 
ature of 
Air, 
Centigr. 

Height 
in 
Metres. 

0° 

10.54 

8° 

10.86 

16° 

11.19 

24° 

11.52 

32° 

11.85 

1 

10.58 

9 

10.91 

17 

11.23 

25 

11.56 

33 

11.89 

2 

10.62 

10 

10.95 

18 

11.28 

26 

11.60 

34 

11.93 

3 

10.66 

11 

10.99 

19 

11.32 

27 

11.64 

35 

11.97 

4 

10.70 

12 

11.03 

20 

11.36 

28 

11.69 

36 

12.01 

5 

10.74 

13 

11.07 

21 

11.40 

29 

11.73 

37 

12.06 

6 

10.78 

14 

11.11 

22 

11.44 

30 

11.77 

38 

12.10 

7 

10.82 

15 

11.15 

23 

11.48 

31 

11.81 

39 

12.14 

D 


89 


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS. 

Table  XIX.  gives,  in  metrical  measure,  the  values  of  a  millimetre  in  the  barom- 
eter at  different  elevations  and  Centigrade  temperatures.  The  values  are  derived 
from  Laplace's  constants,  as  in  Tables  XVI.  and  XVII. 

This  table  may  be  used,  as  the  preceding  ones,  for  reducing  barometrical  obser- 
vations to  the  level  of  the  sea,  and  also  to  any  other  level  by  a  similar  process. 

Example. 

Suppose  the  barometer  to  read  700  millimetres  at  the  altitude  of  750  metres,  the 
temperature  of  air  being  =  16°  Centigrade  ;  what  would  be  the  reading  at  a  station 
lower  by  350  metres,  assuming  the  temperature  of  the  air  downwards  to  increase  at 
the  rate  of  1°  Centigrade  for  185  metres  ? 

The  temperature  of  air  at  lower  station  will  be  16°  +  1°.9  =  17° .9 
The  approximate  height  of  barometer  about  73  centimetres. 

Then,  in  Table  XIX.  we  find  for  16°  and  70  centimetres,       12.15 
"  "  "      for  17° .9  and  73  centimetres,    11.73 

Mean  11.94 

And 

350 
---Q--  =  29.31,  or  barometer  at  lower  station  700  +  29.31  =  729.31  millimetres. 

Delcros's  tables,  with  these  data,  would  give  for  the  difference  of  level  349.76, 
instead  of  350  metres  ;  the  corresponding  error  in  the  height  of  the  barometrical 
column  does  not  exceed  0.08  millimetre,  and  thus  remains  within  the  limits  of  error 
which  may  be  expected  in  an  ordinary  observation. 

The  principal  object  of  this  table,  however,  is  to  furnish  the  scientific  traveller 
with  the  means  of  readily  computing  on  the  spot  approximate  differences  of  level, 
by  simply  multiplying  the  difference  between  the  readings  of  the  barometer  at  each 
station  by  the  half  sum  of  the  numbers  in  the  table  corresponding  to  the  data  given 
by  the  observations. 

Example. 

Suppose  the  barometer  at  the  lower  station  to  read  732.5,  and  at  the  upper  station 
703.2  millimetres ;  the  temperature  of  the  air  being  respectively  18°  and  16°  Centi- 
grade. 

The  difference  of  the  barometers,  supposed  to  be  reduced  to  the  same  temperature, 
is  29.3  millimetres. 

Then,  Table  XIX.  gives  for  18°  Centigrade  and  73  centimetres,     11.73 
"  "         for  16°  Centigrade  and  70  centimetres,     12.15 

Half  sum,  or  mean,  11.94 

And,  29.3  X  11.94  =  349.8  metres  =  difference  of  level  required. 

By  the  large  tables  of  Delcros,  we  find  for  the  same  data  350.1  metres. 

This  table  can  be  considered  as  a  complement  to  Delcros's  tables,  and  may  save 
the  traveller  the  trouble  of  carrying  the  larger  tabtes. 

A  similar  table  in  English  measures  is  found  above,  at  the  end  of  the  author's 
larger  tables  (II.  Table  VI.),  page  48  of  this  series,  the  use  of  which  is  explained  by 
the  examples  just  given. 

D  90 


XIX.         HEIGHT,    IN    METRES,    OF    A    COLUMN    OF    AIR,  CORRESPONDING  TO  A  MILLIMETRE 
IN    THE    BAROMETER,    AT    DIFFERENT    TEMPERATURES    AND    ELEVATIONS. 


Temper- 

Barometer at  the  Lower  Station,  Reading  in  Centimetres. 

ature  of 

Air, 

Centig. 

76 

75 

74 

73 

72 

71 

70 

69 

68 

67 

0 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

0 

10.52 

10.66 

10.80 

10.94 

11.10 

11.26 

11.42 

11.59 

11.75 

11.93 

2 

10.60 

10.74 

10.89 

11.03 

11.19 

11.35 

11.51 

11.68 

11.85 

12.03 

4 

10.69 

10.83 

10.97 

11.12 

11.28 

11.44 

11.60 

11.77 

11.94 

12.13 

6 

10.77 

10.91 

11.06 

11.20 

11.37 

11.53" 

11.69 

11.86 

12.04 

12.22 

8 

10.85 

11.00 

11.15 

11.29 

11.46 

11.62 

11.78 

11.96 

12.13 

12.S2 

10 

10.94 

11.08 

11.23 

11.38 

11.55 

11.71 

11.87 

12.05 

12.22 

12.41 

12 

11.02 

11.17 

11.32 

11.47 

11.63 

11.80 

11.97 

12.14 

12.32 

12.51 

14 

11.11 

11.25 

11.41 

11.55 

11.72 

11.89 

12.06 

12.23 

12.41 

12.60 

16 

11.19 

11.34 

11.49 

11.64 

11.81 

11.98 

12.15 

12.33 

12.51 

12.70 

18 

11.27 

11.43 

11.58 

11.73 

11.90 

12.07 

12.24 

12.42 

12.60 

12.79 

20 

11.36 

11.51 

11.67 

11.82 

11.99 

12.16 

12.33 

12.51 

12.69 

12.89 

22 

11.44 

11.60 

11.75 

11.90 

12.08 

12.25 

12.42 

12.61 

12.79 

12.99 

24 

11.53 

11.68 

11.84 

11.99 

12.17 

12.34 

12.51 

12.70 

12.88 

13.08 

26 

11.61 

11.77 

11.93 

12.08 

12.26 

12.43 

12.61 

12.79 

12.98 

13.18 

28 

11.70 

11.85 

12.01 

12.17 

12.35 

12.52 

12.70 

12.88 

13.07 

13.27 

30 

11.78 

11.94 

12.10 

12.25 

12.43 

12.61 

12.79 

12.98 

13.16 

•13.37 

32 

11.86 

12.02 

12.18 

12.34 

12.52 

12.70 

12.88 

13.07 

13.26 

13.46 

34 

11.95 

12.11 

12.27 

12.43 

12.61 

12.79 

12.97 

13.16 

13.35 

13.56 

36 

12.03 

12.19 

12.36 

12.52 

12.70 

12.88 

13.06 

13.25 

13.45 

13.65 

38 

12.12 

12.28 

12.44 

12.60 

12.79 

12.97 

13.15 

13.35 

13.54 

13.75 

Barometer  in  Centimetres. 

Temper- 
ature of 

Air, 

Centig. 

66 

65 

61 

63 

62 

61 

60 

59 

58 

57 

o 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

0 

12.11 

12.30 

12.49 

12.69 

12.89 

13.10 

13.32 

13.55 

13.78 

14.03 

2 

12.21 

12.40 

12.59 

12.79 

13.00 

13.21 

13.43 

13.66 

13.89 

14.14 

4 

12.31 

12.50 

12.69 

12.89 

13.10 

13.31 

13.54 

13.77 

14.00 

14.25 

6 

12.40 

12.60 

12.79 

13.00 

13.20 

13.42 

13.64 

13.88 

14.11 

14.36 

8 

12.50 

12.69 

12.89 

13.10 

13.31 

13.52 

13.75 

13.98 

14.22 

14.47 

10 

12.60 

12.79 

12.99 

13.20 

13.41 

13.63 

13.86 

14.09 

14.34 

14.59 

12 

12.69 

12.89 

13.09 

13.30 

13.51 

13.73 

13.96 

14.20 

14.45 

14.70 

14 

12.79 

12.99 

13.19 

13.40 

13.62 

13.84 

14.07 

11.31 

14.56 

14.81 

16 

12.89 

13.09 

13.29 

13.50 

13.72 

13.94 

14.18 

14.42 

14.67 

14.92 

18 

12.98 

13.19 

13.39 

13.61 

13.82 

14.05 

14.28 

14.53 

14.78 

15.04 

20 

13.08 

13.28 

13.49 

13.71 

13.93 

14.15 

14.39 

14.63 

14.89 

15.15 

22 

13.18 

13.38 

13.59 

13.81 

14.03 

14.26 

14.50 

14.74 

15.00 

15.26 

24 

13.27 

13.48 

13.69 

13.91 

14.13 

14.36 

14.60 

14.85 

15.11 

15.37 

26 

13.37 

13.58 

13.79 

14.01 

14.24 

14.47 

14.71 

14.96 

15.22 

15.48 

28 

13.47 

13.68 

13.89 

14.11 

14.34 

14.57 

14.82 

15.07 

15.33 

15.60 

30 

13.57 

13.78 

13.99 

14.22 

14.44 

14.68 

14.92 

15.18 

15.44 

15.71 

32 

13.66 

13.87 

14.09 

14.32 

14.55 

14.78 

15.03 

15.28 

15.55 

15.82 

34 

13.76 

13.97 

14.19 

14.44 

14.65 

14.89 

15.14 

15.39 

15.66 

15.93 

36       ! 

13.86 

14.07 

14.29 

14.52 

14.75 

14.99 

15.24 

15.50 

15.77 

16.05 

D 


91 


REDUCING   TO    THE    TRUE    MEAN    BAROMETRIC    PRESSURE. 


WHEN  the  Barometrical  means  to  be  used  have  been  derived  from  observations 
taken  at  such  hours  of  the  day  as,  if  combined,  do  not  give  the  true  mean  pressure, 
they  must  be  reduced  to  the  true  means  by  using  the  Tables  XX.  and  XXI. 
These  tables  give  the  corrections  to  be  applied  to  the  hourly  means,  in  each  month, 
for  reducing  them  to  the  means  which  would  have  been  given  by  observations  made 
at  each  of  the  twenty-four  hours.  The  correction  for  any  given  set  of  hours  is  found 
by  taking  the  mean  of  the  corrections  due  to  each  of  the  combined  hours,  paying 
due  attention  to  the  signs.  Table  XX.  has  been  computed  from  the  hourly  obser- 
vations made  under  the  superintendence  of  Professor  A.  D.  Bache,  at  Girard  College, 
Philadelphia.  Table  XXI.  is  from  the  Greenwich  Observations,  by  Glaisher. 

XX. 

NORTH  AMERICA.  —  PHILADELPHIA.     Lat.  39°  58'  N.    Long.  75°  11'  W.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Barometric  Pressure  of  the  respective  Days,  Months,  and  of  the  Year. 

Barometer  in  English  Inches. 


Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Midnight. 

+.002 

-.009 

-.007 

-.004 

-.002 

+.003 

-.007 

-.003 

-.002 

+  .007 

+  .003 

-.010 

-.0024 

1 

+.001 

-.007 

-.002 

-.001 

+.003 

+.007 

+.001 

-.001 

+.005 

+.007 

+.007 

-.011 

+.0007 

2 

-.007 

-.003 

-.001 

+.006 

+.007 

+.010 

+.004 

+.004 

+  .010 

+.011 

+.011 

-.016 

+.0030 

3 

-.008 

+.002 

+.009 

+.005 

+.007 

+.007 

+.003 

+.005 

+.009 

+.011 

+.007 

-.014 

+.0036 

4 

-.003 

+.003 

+.009 

+.002 

+.003 

+.002 

.000 

+.004 

+.005 

+.007 

+.003 

-.010 

+.0038 

5 

-.003 

.000 

+.002 

-.007 

-.006 

-.007 

-.010 

-.005 

-.006 

-.003 

-.006 

-.008 

-.0050 

6 

-.009 

-.004 

-.011 

-.020 

-.019 

-.022 

-.019 

-.017 

-.016 

-.012 

-.012 

-.015 

-.0147 

7 

-.021 

-.013 

-.020 

-.029 

-.026 

-.024 

-.025 

-.023 

-.023 

-.021 

-.019 

-.023 

-.0222 

8 

-.032 

-.023 

-.028 

-.034 

-.031 

-.029 

-.028 

-.026 

-.029 

-.030 

-.028 

-.029 

-.0290 

9 

-.040 

-.026 

-.028 

-.035 

-.028 

-.027 

-.027 

-.033 

-.031 

-.029 

-.034 

-.030 

-.0307 

10 

-.041 

-.026 

-.025 

-.033 

-.024 

-.025 

-.026 

-.030 

-.029 

-.026 

-.038 

-.032 

-.0296 

11 

-.023 

-.019 

-.016 

-.023 

-.018 

-.019 

-.019 

-.022 

-.021 

-.014 

-.017 

-.011 

-.0185 

Noon. 

+.006 

-.004 

-.002 

-.008 

-.006 

-.010 

-.012 

-.012 

-.009 

+.001 

+  .006 

+.005 

-.0037 

1 

+.028 

+.017 

+.014 

+.006 

+.005 

.000 

.000 

.000 

+  .005 

+.006 

+  .023 

+  .024 

+.0107 

2 

+.037 

+.032 

+.031 

+.021 

+.017 

+.011 

+.011 

+.012 

+.020 

+.028 

+.033 

+.034 

+.0240 

3 

+.034 

+.034 

+.034 

+.034 

+.028 

+.019 

+.020 

+.022 

+.024 

+.028 

+.033 

+.034 

+.0287 

4 

+.031 

+.032 

+.034 

+.042 

+.032 

+.027 

+.027 

+.027 

+.030 

+.028 

+.027 

+.030 

+.0306 

5 

+.024 

+.024 

+.025 

+.036 

+.034 

+.030 

+.028 

+.029 

+.027 

+.021 

+.018 

+.026 

+.0267 

6 

+.015 

+.014 

+.016 

+.031  +.027 

+.023 

+.028 

+.028 

+.023 

+.012 

+.005 

+.021 

+.0202 

7 

+.003 

+.006 

+.007 

+.022 

+.016 

+.018 

+.021 

+.018 

+.016 

+.001 

-.002 

+.018 

+.0123 

8 

+.003 

.000 

-.003 

+.009 

+.002 

+.010 

+.014 

+.008 

+.007 

-.009 

-.006 

+.013 

+.0040 

9 

-.002 

-.008 

-.010 

+.001 

-.010 

.000 

+.003 

+.003 

-.001 

-.013 

-.007 

+.012 

-.0027 

10 

-.003 

-.012 

-.011 

-.003 

-.018 

-.003 

-.004 

-.001 

-.005 

-.016 

-.010 

+.008 

-.0065 

11 

+.002 

-.011 

-.017 

-.010 

-.019 

-.005 

-.002 

-.002 

-.004 

-.009 

-.003 

+.005 

-.0064 

6,  2,  10 

+.008 

+.005 

+.003 

-.001 

-.007 

-.005 

-.004 

-.002 

.000 

.000 

+.004 

+.009 

+  .001 

7,2,9 

+.008 

+.004 

.000 

-.002  -.006 

-.004  -.004 

-.003 

-.001 

-.002 

+.002  +.008 

.000 

9,12,3,9 

.000 

-.001 

-.001 

-.002  -.00-1 

-.004  -.004!  -.004 

-.004 

-.003 

-.001  +.005 

-  .002 

D 


92 


XXI.     ENGLAND.  —  GREENWICH.     Lai.  51°  29'  N. ;  Long.  0°  0'. 
Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation,  or  Sets  of  Hours, 
to  obtain  the  true  Mean  Barometric  Pressure  for  the  respective  Months.  —  GLAISHER. 

English  Inches. 


Hours. 

Jan. 

Feb. 

March 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Midn.  .  . 

Inch. 
.000 

Inch. 
-.001 

Inch. 
-.002 

Inch. 
-.008 

Inch. 
-.005 

Inch. 
.000 

Inch 
-.006 

Inch. 
-.010 

Inch. 
-.005 

Inch. 
-.005 

Inch. 
-.011 

Inch. 
-.004 

Inch. 
-.005 

1 

.001 

.004 

.013 

.000 

.002 

.004 

.000 

.000 

.000 

.004 

-.005 

.001 

.002 

2 

.002 

.008 

.020 

.007 

.004 

.005 

.003 

.007 

.005 

.010 

.003 

.006 

.007 

3 

.005 

.012 

.023 

.010 

.005 

.004 

.005 

.011 

.010 

.015 

.008 

.010 

.009 

4 

.011 

.014 

.022 

.011 

.005 

.001 

.005 

.014 

.012 

.020 

.013 

.012 

.012 

5 

.015 

.015 

.019 

.011 

.006 

-.002 

.006 

.011 

.014 

.022 

.016 

.014 

.012 

6 

.015 

.012 

.012 

.006 

.006 

-.006 

.002 

.005 

.010 

.018 

.015 

.011 

.009 

7 

.010 

.007 

.005 

-.003 

.006 

-.010 

-.004 

.000 

.001 

.008 

.010 

.006 

.003 

8 

.003 

.000 

-.004 

-.008 

.003 

-.012 

-.008 

-.007 

-.006 

-.003 

.003 

.004 

-.003 

9 

-.008 

-.008 

-.010 

-.011 

-.007 

-.012 

-.010 

-.008 

-Oil 

-.009 

-.005 

-.010 

-.009 

10 

-.010 

-.015 

-.015 

-.014 

-.009 

-.011 

-.010 

-.009 

-.013 

-.014 

-.007 

-.015 

-.012 

11 

-.014 

-.016 

-.015 

-.011 

-.006 

-.009 

-.009 

-.008 

-.010 

-.014 

-.005 

-.015 

-.011 

Noon.  .  . 

-.005 

-.012 

-.010 

-.008 

-.002 

-.006 

-.006 

-.005 

-.005 

-.010 

.002 

-.009 

-.006 

1 

.002 

-.006 

-.005 

-.004 

.000 

-.003 

-.003 

.000 

.000 

-.003 

.007 

.003 

-.001 

2 

.005 

.003 

.000 

.003 

.003 

.003 

.001 

.003 

.004 

.004 

Oil 

.008 

.004 

3 

.004 

.006 

003 

.009 

.006 

.007 

.005 

.005 

.008 

.005 

.010 

.010 

.006 

4 

.002 

.008 

.005 

.004 

.010 

.013 

.009 

.009 

.010 

.003 

.008 

.009 

.007 

5 

.000 

.006 

.004 

.014 

.014 

.017 

.013 

.011 

.011 

.000 

.004 

.006 

.008 

6 

-.003 

.002 

.000 

.011 

.015 

.017 

.013 

.011 

.006 

-.005 

.000 

.002 

.006 

7 

-.005 

-.004 

-.006 

-.007 

.010 

.014 

.010 

.005 

.000 

-.008 

-.006 

-.003 

.000 

8 

-.006 

-.006 

-.012 

-.005 

.000 

.008 

.004 

-.005 

-.005 

-.011 

-.012 

-.006 

-.005 

9 

-.007 

-.008 

-.015 

-.009 

-.006 

.003 

-.001 

-.010 

-.009 

-.014 

-.017 

-.09 

-.008 

10 

-.005 

-.007 

-.012 

-.012 

-.008 

-.002 

-.005 

-.015 

-.011 

-.012 

-.019 

-.010 

-.010 

11 

-.004 

-.005 

-.010 

-.012 

-.008 

-.002 

-.012 

-.015 

-.011 

-.009 

-.017 

-.009 

-.009 

6.  6 

.006 

.007 

.006 

.008 

.011 

.005 

.008 

.008 

.008 

.006 

.007 

.006 

.008 

7.  7 

.002 

.002 

.000 

-.005 

.008 

.002 

.003 

.002 

.000 

.000 

.002 

.002 

.001 

8.  8 

-.002 

-.003 

-.008 

-.006 

.002 

-.002 

-.002 

-.006 

-.006 

-.007 

-.004 

-.001 

-.004 

9.  9 

-.007 

-.008 

-.013 

-.010 

-.006 

-.004 

-.005 

-.009 

-.010 

-.012 

-.011 

-.009 

-.009 

10.10 

-.007 

-.011 

-.014 

-.013 

-.009 

-.006 

-.007 

-.012 

-.012 

-.013 

-.013 

-.012 

-.011 

7.  2.  9 

.003 

.001 

-.003 

-.003 

.001 

-.001 

-.001 

-.002 

-.001 

-.001 

.001 

.002 

.001 

6.  2.  8 

.005 

.003 

.000 

.001 

.003 

.002 

.002 

.001 

.003 

.004 

.005 

.004 

.003 

6.  2.10 

.005 

.003 

.000 

-.001 

.000 

-.002 

-.001 

-.002 

.001 

.003 

.002 

.003 

.001 

6.  2.  6 

.006 

.006 

.004 

.007 

.008 

-.005 

.005 

.006 

.007 

.006 

.009 

.007 

.006 

7.  2 

.007 

.005 

.003 

.000 

.004 

-.004 

-.001 

.002 

.002 

.006 

.010 

.007 

.003 

8.  2 

.004 

.002 

-.002 

-.002 

.003 

-.004 

-.003 

-.002 

-.001 

.000 

.007 

.006 

.001 

8.  1 

.002 

-.003 

-.004 

-.006 

.001 

-.007 

-.006 

-.003 

-.003 

-.003 

.005 

.003 

-.002 

7.  1 

.006 

.001 

.000 

-.003 

.003 

-.006 

-.003 

.000 

.000 

.002 

.008 

.004 

.001 

9.12.3.9 

-.004 

-.005 

-.008 

-.005 

-.002 

-.002 

-.003 

-.004 

-.004 

-.007 

-.002 

-.004 

-.004 

D 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

93 


XXII.  TABLE   TO   REDUCE,   BY  INTERPOLATION, 


THE  OBSERVATIONS  TO  THE  SAME  ABSOLUTE  TIME. 


DECIMALS  OF  AN  HOUR. 


Min. 

Decimal. 

Min. 

Decimal. 

Min. 

Decimal. 

Min. 

Decimal. 

Min. 

Decimal. 

Min. 

Decimal. 

1 

.017 

11 

.183 

21 

.350 

31 

.517 

41 

.683 

51 

.850 

2 

.033 

12 

.200 

22 

.367 

32 

.533 

42 

.700 

52 

.867 

3 

.050 

13 

.217 

23 

.383 

33 

.550 

43 

.717 

53 

.883 

4 

.067 

14 

.238 

24 

.400 

34 

.567 

44 

.733 

54 

.900 

5 

.083 

15 

.250 

25 

.417 

35 

.583 

45 

.750 

55 

.917 

6 

.100 

16 

.267 

26 

.433 

36 

.600 

46 

.767 

56 

.933 

7 

.117 

17 

.283 

27 

.450 

37 

.617 

47 

.783 

57 

.950 

8 

.133 

18 

.300 

28 

.467 

38 

.633 

48 

.800 

58 

.967 

9 

.150 

19 

.317 

29 

.483 

39 

.650 

49 

.817 

59 

.983 

10 

.167 

20 

.333 

30 

.500 

40 

.667 

50 

.833 

60 

1.000 

TABLE  FOR  CORRECTION  OF  CURVATURE  AND  REFRACTION. 

From  a  mountain,  when  furnished  with  a  barometer,  or  with  an  apparatus  for  de- 
termining the  temperature  of  boiling  water,  and  a  pocket  level,  an  observer  can 
find  the  elevations  of  distant  points,  which  are  in  sight,  but  lower  than  the  mountain 
itself  on  which  he  stands.  He  has  only  to  seek,  with  the  level,  the  point  on  the 
slope  of  the  mountain  which  corresponds  to  the  point  at  a  distance  that  he  wishes  to 
determine,  and  to  take  there  a  barometrical,  or  a  boiling  point  observation.  This 
observation  is  to  be  calculated  in  the  usual  way,  but  the  result  must  be  corrected  for 
the  curvature  of  the  surface  of  the  globe,  and  for  the  atmospheric  refraction,  by 
means  of  the  following  Table. 

This  method,  which  furnishes  the  means  of  multiplying,  without  much  trouble, 
'the  measurements  of  heights,  gives  approximations  which  are  sufficient  for  most 
of  the  purposes  of  Physical  Geography.  It  may  even  seem  preferable  to  direct 
measurements  for  determining  the  mean  elevation  of  certain  physical  lines,  which 
are  best  estimated  when  seen  from  a  distance  ;  such  as  the  upper  limit  of  the 
growth  of  trees,  the  limits  of  different  kinds  of  vegetation,  that  of  permanent  snow, 
that  of  the  mean  elevation  of  the  crest  of  a  mountain  range,  &c. 

Table  XXIII.  is  taken  from  Captain  LEE'S  Collection  of  Talks  and  Formula, 
2d  edit.,  page  81. 

D  94 


XXIII.     CORRECTIONS    FOR    CURVATURE    AND   REFRACTION. 
Showing  the  Difference  of  the  Apparent  and  True  Level,  in  feet  and  decimals,  for  Distances  in  feet  and  miles. 


Distances, 
in  Feet. 

Correction  in  Feet. 

Distances 
in  jMiles. 

Correction  in  Feet. 

For  Cur- 
vature. 

For  Re- 
fraction. 

For  Curva- 
ture and 
Refraction. 

For  Cur- 
vature. 

For  Re- 
fraction. 

For  Curva- 
ture and 
Refraction. 

100 

.00024 

.00004 

.00020 

I 

4 

.0417 

.0060 

.0357 

150 

.00054 

.00008 

.00046 

\ 

.1668 

.0238 

.1430 

200 

.00094 

.00013 

.00083 

i 

.3752 

.0536 

.3216 

250 

.00149 

.00021 

.00128 

i 

.6670 

.0953 

.5717 

300 

.00215 

.00031 

.00184 

il 

1.5008 

.2144 

1.2864 

350 

.00293 

.00042 

.00251 

2 

2.6680 

.3811 

2.2869 

400 

.00383 

.00035 

.00328 

21 

4.1688 

.5955 

3.5733 

450 

.00484 

.00069 

.00415 

3 

6.0030 

.8561 

5.1469 

500 

.00598 

.00085 

.00513 

31 

8.1708 

1.1673 

7.0035 

550 

.00724 

.00103 

.00621 

4 

10.6720 

1.5246 

9.1474 

600 

.00861 

.00123 

.00738 

4 

13.5468 

1.9295 

11.5773 

650 

.01010 

.00144 

.00866 

5 

16.6750 

2.3821 

14.2929 

700 

.01172 

.00167 

.01005 

51 

20.1769 

2.8824 

17.2945 

750 

.01345 

.00192 

.01153 

6 

24.0120 

3.4303 

20.5817 

800 

.01531 

.00219 

.01312 

61 

28.1809 

4.0258 

24.1551 

850 

.01728 

.00247 

.01481 

7 

32.6830 

4.6690 

28.0143 

900 

.01938 

.00277 

.01661 

71 

37.5190 

5.3599 

32.1591 

950 

.02159 

.00308 

.01851 

8 

42.6880 

6.0997 

36.5883 

1000 

.02392 

.00333 

.02059 

81 
5 

48.1910 

6.8844 

41.3066 

1050 

.02638 

.00377 

.02261 

9 

54.0270 

7.7181 

46.3089 

1100 

.02895 

.00414 

.02481 

91 

60.1971 

8.5996 

51.5975 

1150 

.03164 

.00452 

.02712 

10 

66.7000 

9.5286 

57.1714 

1200 

.03445 

.00492 

.02953 

11 

80.7070 

11.5296 

69.1774 

1250 

.03738. 

.00534 

.03204 

12 

96.0480 

13.7211 

82.3269 

1300 

.04043 

.00578 

.03465 

13 

112.7230 

16.1033 

96.6197 

1350 

.04361 

.00623 

.03738 

14 

130.7320 

18.6760 

112.0560 

1400 

.04689 

.00670 

.04019 

15 

150.0750 

21.4393 

128.6357 

1450 

.05030 

.00719 

.04311 

16 

170.7520 

243931 

146.3589 

1500 

.05383 

.00769 

.04614 

17 

192.7630 

27.5376 

165.2254 

1550 

.05748 

.00821 

.04927 

18 

216.1086 

30.8727 

1S5.2359 

1600 

.06125 

.00875 

.05250 

19 

240.7870 

34.3981 

206.3889 

1650 

.06514 

.00931 

.05583 

20 

266.8000 

38.1143 

228.6857 

1700 

.06914 

.00988 

.05926 

1750 

.07327 

.01047 

.06280 

1800 

.07752 

.01107 

.06645 

1850 

.08188 

.01170 

.07018 

1900 

.08637 

.01234 

.07403 

1950 

.09098 

.01300 

.07798 

2000 

.09570 

.01367 

.08203 

I) 


95 


THERMOMETBICAL 


MEASUREMENT    OF     HEIGHTS, 


TABLES 


FOR   DEDUCING   DIFFERENCES    OF    LEVEL    FROM    OBSERVATIONS    OF   THE 
TEMPERATURE    OF   BOILING   WATER. 


D  95' 


THERMOMETRICAL   MEASUREMENT   OF   HEIGHTS. 


TABLES 

FOR    DEDUCING    DIFFERENCES    OF    LEVEL    FROM    THE    TEMPERATURE    OF    THE 
BOILING    POINT    OF    WATER. 


WHEN  water  is  heated  in  the  open  air,  the  elastic  force  of  the  vapors  produced 
from  it  gradually  increases,  until  it  becomes  equal  to  the  incumbent  weight  of  the 
atmosphere.  Then,  the  pressure  of  the  atmosphere  being  overcome,  the  steam 
escapes  rapidly  in  large  bubbles,  and  the  water  boils.  The  temperature  at  which, 
in  the  open  air,  water  boils,  thus  depends  upon  the  weight  of  the  atmospheric  col- 
umn above  it,  and  under  a  less  barometric  pressure  the  water  will  boil  at  a  lower 
temperature  than  under  a  greater  pressure.  Now,  as  the  weight  of  the  atmosphere 
decreases  with  the  elevation,  it  is  obvious  that,  in  ascending  a  mountain,  the  higher 
the  station  where  an  observation  is  taken,  the  lower  the  temperature  at  which  water 
boils  at  that  station  will  be. 

The  difference  of  elevation  between  two  places,  therefore,  can  be  deduced  from 
the  temperature  of  boiling  water  observed  at-  each  station.  It  is  only  necessary  to 
find  the  barometric  pressures  which  correspond  to  those  temperatures,  and,  the  at- 
mospheric pressures  at  both  places  being  known,  to  compute  the  difference  of  level 
by  a  formula,  or  by  the  tables  given  above  for  computing  heights  from  barometrical 
observations. 

From  the  above,  it  may  be  seen  that  the  heights  determined  by  means  of  the  tem- 
perature of  boiling  water  are  less  reliable  than  those  deduced  from  barometrical 
observations.  Both  derive  the  difference  of  altitude  from  the  difference  of  atmos- 
pheric pressure.  But  the  temperature  of  boiling  water  gives  only  indirectly  the 
atmospheric'  pressure,  which  is  given  directly  by  the  barometer.  This  method  is 
thus  liable  to  all  the  chances  of  error  which  may  affect  the  measurements  by  means 
of  the  barometer,  besides  adding  to  them  new  ones  peculiar  to  itself,  the  principal 
of  which,  not  to  speak  of  the  differences  exhibited  in  the  various  tables  of  the  force 
of  vapor,  is  the  difficulty  of  ascertaining  with  the  necessary  accuracy  the  true 
temperature  of  boiling  water.  In  the  present  state  of  thermometry  it  would  hardly 
be  safe,  indeed,  to  .answer,  in  the  most  favorable  circumstances,  for  quantities  so 
small  as  hundredths  of  degrees,  even  when  the  thermometer  has  been  constructed 
with  the  utmost  care  ;  moreover,  the  quality  of  the  glass  of  the  instrument,  the  form 
and  the  substance  of  the  vessel  containing  the  water,  the  nature  of  the  water  itself, 
the  place  at  which  the  bulb  of  the  thermometer  is  placed,  whether  in  the  current  of 
steam  or  in  the  water,  —  all  these  circumstances  cause  no  inconsiderable  variations 
to  take  place  in  the  indications  of  thermometers  observed  under  the  same  atmospheric 

D  96 


THERMOMETRICAL    MEASUREMENT    OF    HEIGHTS. 

pressure.  Owing  to  these  various  causes,  an  observation  of  the  boiling  point,  differ- 
ing by  one  tenth  of  a  degree  from  the  true  temperature,  ought  to  be  still  admitted  as 
a  good  one.  Now,  as  the  tables  show,  an  error  of  one  tenth  of  a  degree  Centigrade 
in  the  temperature  of  boiling  water  would  cause  an  error  of  2  millimetres  in  the 
barometric  pressure,  or  of  from  70  to  80  feet  in  the  final  result,  while  with  a  good 
barometer  the  error  of  pressure  will  hardly  ever  exceed  one  tenth  of  a  millimetre, 
making  a  difference  of  3  feet  in  altitude. 

Notwithstanding  these  imperfections,  the  hypsometric  thermometer,  or  thermo- 
barometer,  is  of  the  greatest  utility  to  travellers  traversing  distant  or  rough  countries, 
on  account  of  its  being  more  conveniently  transported,  and  much  less  liable  to 
accidents  than  the  mercurial  barometer.  The  best  form  for  it  is  that  contrived  and 
described  by  Regnault  in  the  Annales  de  Chimie  et  de  Physique,  Tom.  XIV.  p.  202. 
It  consists  of  an  accurate  thermometer  with  long  degrees,  subdivided  into  tenths,  whose 
bulb  is  placed,  about  2  or  3  centimetres  above  the  surface  of  the  water,  in  the  steam 
arising  from  distilled  water  in  a(  cylindrical  vessel,  the  water  being  made  to  boil  by  a 
spirit-lamp.  The  whole  instrument  when  closed  is  about  6  inches  long  ;  when  drawn 
out  for  observation,  about  14  inches. 

Table  XXIV.  of  barometric  pressures  corresponding  to  temperatures  of  boiling 
water,  has  been  calculated  by  Regnault  from  his  Tables  of  Forces  of  Vapor,  and 
published  in  the  Annales  de  Chimie  et  de  Physique,  Tom.  XIV.  p.  206.  It  gives,  in 
millimetres  of  mercury,  the  barometric  pressures  corresponding  to  every  tenth  of  a 
Centigrade  degree  ;  for  greater  convenience,  the  values  for  every  hundredth  have 
been  added. 

The  accuracy  of  this  table  has  been  tested  by  direct  observation  by  Mr.  Wisse,  a 
traveller  competent  in  such  matters,  who  noted  down  simultaneously  the  tempera- 
tures of  the  boiling  point  of  water  and  the  height  of  the  barometer,  in  various  parts 
of  the  Andes,  up  to  the  summit  of  the  volcano  of  Pichincha,  including  in  his  obser- 
vations barometrical  pressures  ranging  from  752  to  430  millimetres  of  mercury. 
The  agreement  between  the  barometric  pressures  given  here  by  Regnault  and  those 
found  by  Wisse  are  very  satisfactory,  the  differences  never  exceeding  a  few  tenths 
of  a  millimetre.  See  Annales  de  Chimie  et  de  Physique,  Tom.  XXVIII.  p.  123. 

Table  XXV.  is  the  same  table,  revised  by  A.  Moritz,  who,  in  a  communication  to 
the  Academie  des  Sciences,  in  October,  1856,  called  the  attention  to  some  slight 
errors  of  computation  in  Regnault's  table,  and  gave  the  corrected  numbers  for  every 
whole  degree  from  40°  to  102°  Centigrade.  Those  numbers  are  given  here  from 
80°  upwards,  as  published  in  the  Journal  de  Plnstitut ;  the  values  for  every  tenth  of 
a  degree,  and  their  differences,  have  been  computed  to  fit  the  table  for  practical  use. 
The  comparison  of  the  two  tables  will  show  that  the  corrections  mostly  amount  to  a 
few  hundredths,  and  never  exceed  one  tenth  of  a  millimetre. 

Table  XXVI.  is  table  XXV,  reduced  to  English  measures. 


D  97 


XXIV.  BAROMETRIC  PRESSURES  CORRESPONDING  TO  TEMPERATURES  OF  BOILING  WATER.   1 


Hundredths  of  a  Degree. 

Centig. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

MiUim. 

Millim. 

Millim. 

85.0 

433.04 

433.21 

433.38 

433.55 

433.72 

433.89 

434.07 

434.24 

434,41 

434.58 

85.1 

434.75 

434.92 

435.09 

435.26 

435.43 

435.60 

435.78 

435.95 

436.12 

436.29 

85.2 

436.46 

436.63 

436.80 

436.97 

437.14 

437.31 

437.49 

437.66 

437.83 

438.00 

85.3 

438.17 

438.34 

438.51 

438.69 

438.86 

439.03 

439.20 

439.37 

439.55 

439.72 

85.4 

439.89 

440.06 

440.23 

440.41 

440.58 

440.75 

440.93 

441.10 

441.27 

441.45 

85.5 

441.62 

441.79 

441.97 

442.14 

442.31 

442.48 

442.66 

442.83 

443.00 

443.18 

85.6 

443.35 

443.52 

443.70 

443.87 

444.05 

444.22 

444.39 

444.57 

444.74 

444.92 

85.7 

445.09 

445.26 

445.44 

445.61 

445.79 

445.96 

446.14 

446.31 

446.49 

446.67 

85.8 

446.84 

447.01 

447.19 

447.36 

447.54 

447.71 

447.89 

448.06 

448.24 

448.41 

85.9 

448.59 

448.76 

448.94 

449.11 

449.29 

449.46 

449.64 

449.81 

449,99 

450.16 

86.0 

450.34 

450.52 

450.69 

450.87 

451.04 

451.22 

451.40 

451.57 

451.75 

451.92 

86.1 

452.10 

452.28 

452.45 

452.63 

452.81 

452.98 

453.16 

453.34 

453.52 

453.69 

86.2 

453.87 

454.05 

454.22 

454.40 

454.58 

454.75 

454.93 

455.11 

455.29 

455.46 

86.3 

455.64 

455.82 

456.00 

456.17 

456.35 

456.53 

456.71 

456.89 

457.06 

457.24 

86.4 

457.42 

457.60 

457.78 

457.96 

458.14 

458.31 

458.49 

458.67 

458.85 

459.03 

86.5 

459.21 

459.39 

459.57 

459.75 

459.93 

460.10 

460.28 

460.46 

460.64 

460.82 

86.6 

461.00 

461.18 

461.36 

461.54 

461.72 

461.90 

462.08 

462.26 

462.44 

462.62 

86.7 

462.80 

46298 

463.16 

463.34 

463.52 

463.70 

463.88 

464.06 

464.24 

464.42 

86.8 

464.60 

464.78 

464.96 

465.14 

465.32 

465.50 

465.69 

465.87 

466.05 

466.23 

86.9 

466.41 

466.59 

466.77 

466.95 

467.13 

467.31 

467.50 

467.68 

467.86 

468.04 

87.0 

468.22 

468.40 

468.58 

468.77 

468.95 

469.13 

469.31 

469.49 

469.68 

469.86 

87.1 

470.04 

470.22 

470.41 

470.59 

470.77 

470.95 

471.14 

471.32 

471.50 

471.69 

87.2 

471.87 

472.05 

472.24 

472.42 

472.60 

472.78 

472.97 

473.15 

473.33 

473.52 

87.3 

473.70 

473.88 

474.07 

474.25 

474.44 

474.62 

474.80 

474.99 

475.17 

475.36 

87.4 

475.54 

475.72 

475.91 

476.09 

476.28 

476.46 

476.64 

476.83 

477.01 

477.20 

87.5 

477.38 

477.56 

477.75 

477.93 

478.12 

478.30 

478.49 

478.67 

478.86 

479.04 

87.6 

479.23 

479.41 

479.60 

479.78 

479.97 

480.15 

480.34 

480.52 

480.71 

480.89 

87.7 

481.08 

481.27 

481.45 

481.64 

481.82 

482.01 

482.20 

482.38 

482.57 

482.75 

87.8 

482.94 

483.13 

483.31 

483.50 

483.69 

483.87 

484.06 

484.25 

484.44 

484.62 

87.9 

484.81 

485.00 

485.19 

485.37 

485.56 

485.75 

485.94 

486.13 

486.31 

486.50 

88.0 

486.69 

486.88 

487.07 

487.25 

487.44 

487.63 

487.82 

488.01 

488.19 

488.38 

88.1 

488.57 

488.76 

488.95 

489.13 

489.32 

489.51 

489.70 

489.89 

490.07 

490.26 

88.2 

490.45 

490.64 

490.83 

491.02 

491.21 

491.39 

491.58 

491.77 

491.96 

492.15 

88.3 

492.34 

492.53 

492.72 

492.91 

493.10 

493.29 

493.48 

493.67 

493.86 

494.05 

88.4 

494.24 

494.43 

494.62 

494.81 

495.00 

495.19 

495.39 

495.58 

495.77 

495.96 

88.5 

496.15 

496.34 

496.53 

496.72 

496.91 

497.10 

497.30 

497.49 

497.68 

497.87 

88.6 

498.06 

498.25 

498.44 

498.64 

498.83 

499.02 

499.21 

499.40 

499.60 

499.79 

88.7 

499.98 

500.17 

500.36 

500.56 

500.75 

500.94 

501.13 

501.32 

501.52 

501.71 

88.8 

501.90 

502.09 

502.28 

502.48 

502.67 

502.86 

503.05 

503.24 

503.44 

503.63 

88.9 

503.82 

504.01 

504.21 

504.40 

504.60 

504.79 

504.98 

505.18 

505.37 

505.57 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

D 


98 


2       BAROMETRIC    PRESSURES    CORRESPONDING    TO    TEMPERATURES    OF    BOILING   WATER. 


Hundredths  of  a  Degree. 

Centig. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

89.0 

505.76 

505.95 

506.15 

506.34 

506.54 

506.73 

506.92 

507.12 

507.31 

507.51 

89.1 

507.70 

507.89 

508.09 

508.28 

508.48 

508.67 

508.87 

509.06 

509.26 

509.45 

89.2 

509.65 

509.84 

510.04 

510.23 

510.43 

510.62 

510.82 

511.01 

511.21 

511.40 

89.3 

511.60 

511.80 

511.99 

512.19 

512.38 

512.58 

512.78 

512.97 

513.17 

513.36 

89.4 

513.56 

513.76 

513.95 

514.15 

514.35 

514.54 

514.74 

514.94 

515.14 

515.33 

89.5 

515.53 

515.73 

515.92 

516.12 

516.32 

516.51 

516.71 

516.91 

517.11 

517.30 

89.6 

517.50 

517.70 

517.90 

518.09 

518.29 

518.49 

518.69 

518.89 

519.08 

519.28 

89.7 

519.48 

519.68 

519.88 

520.07 

520.27 

520.47 

520.67 

520.87 

521.06 

521.26 

89.8 

521.46 

521.66 

521.86 

522.06 

522.26 

522.46 

522.66 

522.86 

523.05 

523.25 

89.9 

523.45 

523.65 

523.85 

524.05 

524.25 

524.45 

524.65 

524.85 

525.05 

525.25 

90.0 

525.45 

525.65 

525.85 

526.05 

526.25 

526.45 

526.65 

526.85 

527.05 

527.25 

90.1 

527.45 

527.65 

527.85 

528.05 

528.25 

528.45 

528.66 

528.86 

529.06 

529.26 

90.2 

529.46 

529.66 

529.86 

530.07 

530.27 

530.47 

530.67 

530.87 

531.08 

531.28 

90.3 

531.48 

531.68 

531.88 

532.09 

532.29 

532.49 

532.69 

532.89 

533.10 

533.30 

90.4 

533.50 

533.70 

533.91 

534.11 

534.31 

534.51 

534.72 

534.92 

535.12 

535.33 

90.5 

535.53 

535.73 

535.94 

536.14 

536.35 

536.55 

536.75 

536.96 

537.16 

537.37 

90.6 

537.57 

537.77 

537.98 

538.18 

538.39 

538.59 

538.79 

539.00 

539.20 

539.41 

90.7 

539.61 

539.81 

540.02 

540.22 

540.43 

540.63 

540.84 

541.04 

541.25 

541.45 

90.8 

541.66 

541.87 

542.07 

542.28 

542.48 

542.69 

542.90 

543.10 

543.31 

543.51 

90.9 

543.72 

543.93 

544.13 

544.34 

544.54 

544.75 

544.96 

545.16 

545.37 

545.57 

91.0 

545.78 

545.99 

546.19 

546.40 

546.61 

546.81 

547.03 

547.23 

547.44 

547.64 

91.1 

547.85 

548.06 

548.26 

548.47 

548.68 

548.88 

549.09 

549.30 

549.51 

549.71 

91.2 

549.92 

550.13 

550.34 

550.54 

550.75 

550.96 

551.17 

551.38 

551.58 

551.79 

91.3 

552.00 

552.21 

552.42 

552.63 

552.84 

553.04 

553.25 

553.46 

553.67 

553.88 

91.4 

554.09 

554.30 

554.51 

554.72 

554.93 

555.14 

555.35 

555.56 

555.77 

555.98 

91.5 

556.19 

556.40 

556.61 

556.82 

557.03 

557.24 

557.45 

557.66 

557.87 

558.08 

91.6 

558.29 

558.50 

558.71 

558.92 

559.13 

559.34 

559.55 

559.76 

559.97 

560.18 

91.7 

560.39 

560.60 

560.81 

561.03 

561.24 

561.45 

561.66 

561.87 

562.09 

562.30 

91.8 

562.51 

562.72 

562.93 

563.15 

563.36 

563.57 

563.78 

563.99 

564.21 

564.42 

91.9 

564.63 

564.86 

565.06 

565.27 

565.48 

565.69 

565.91 

566.12 

566.33 

566.55 

92.0 

566.76 

566.97 

567.19 

567.40 

567.61 

567.85 

568.04 

568.25 

568.46 

568.68 

92.1 

568.89 

569.10 

569.32 

569.53 

569.75 

569.96 

570.17 

570.39 

570.60 

570.82 

92.2 

571.03 

571.24 

571.46 

571.67 

571.89 

572.10 

572.32 

572.53 

572.75 

572.96 

92.3 

573.18 

573.40 

573.61 

573.83 

574.04 

574.26 

574.48 

574.69 

574.91 

575.12 

92.4 

575.34 

575.56 

575.77 

575.99 

576.20 

576-42 

576.64 

576.85 

577.07 

577.28 

92.5 

577.50 

577.72 

577.93 

578.15 

578.37 

578.58 

578.80 

579.02 

579.24 

579.45 

92.6 

579.67 

579.89 

580.10 

580.32 

580.54 

580.75 

580.97 

581.19 

581.41 

581.62 

92.7 

581.84 

582.06 

582.28 

582.49 

582.71 

582.93 

583.15 

583.37 

583.58 

583.80 

92.8 

584.02 

584.24 

584.46 

584.68 

584.90 

585.11 

585.33 

585.55 

585.77 

585.99 

92.9 

586.21 

586.43 

5S6.65 

586.87 

587.09 

587.31 

587.53 

587.75 

587.97 

588.19 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

D 


99 


BAROMETRIC    PRESSURES    CORRESPONDING   TO    TEMPERATURES    OF    BOILING    WATER.       3 


Centig. 
Degrees. 

Hundredths  of  a  Degree. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

93.0 

588.41 

588.63 

588.85 

589.07 

589.29 

589.51 

589.73 

589.95 

590.17 

590.39 

93.1 

590.61 

590.83 

591.05 

591.27 

591.49 

591.71 

591.94 

592.16 

592.38 

592.60 

93.2 

592.82 

593.04 

593.26 

593.49 

593.71 

593.93 

594.15 

594.37 

594.60 

594.82 

93.3 

595.04 

595.26 

595.48 

595.71 

595.93 

596.15 

596.37 

596  59 

596.82 

597.04 

93.4 

597.26 

597.48 

597.71 

597.93 

598.15 

598.37 

598.60 

598.82 

599.04 

599.27 

93.5 

599.49 

599.71 

599.94 

600.16 

600.38 

600.60 

600.83 

601.05 

601.27 

601.50 

93.6 

601.72 

601.94 

602.17 

602.39 

602.62 

602.84 

603.07 

603.29 

603.52 

603.74 

93.7 

603.97 

604.19 

604.42 

604.64 

604.87 

605.09 

605.32 

605.54 

605.77 

605.99 

93.8 

606.22 

606.45 

606.67 

606.90 

607.12 

607.35 

607.58 

607.80 

608.03 

608.25 

93.9 

608.48 

608.71 

608.93 

609.16 

609.38 

609.61 

609.84 

610.06 

610.29 

610.51 

94.0 

610.74 

610.97 

611.19 

611.42 

611.65 

611.87 

612.10 

612.33 

612.56 

612.78 

94.1 

613.01 

613.24 

613.47 

613.69 

613.92 

614.15 

614.38 

614.61 

614.83 

615.06 

94.2 

615.29 

615.52 

615.75 

615.97 

616.21 

616.43 

616.66 

616.89 

617.12 

617.35 

94.3 

617.58 

617.81 

618.04 

618.27 

618.50 

618.72 

618.95 

619.18 

619.41 

619.64 

94.4 

619.87 

620.10 

620.33 

620.56 

620.79 

621.02 

621.25 

621.48 

621.71 

621.94 

94.5 

622.17 

622.40 

622.63 

622.86 

623.09 

623.32 

623.56 

623.79 

624.02 

624.25 

94.6 

624.48 

624.71 

624.94 

625.17 

625.40 

625.63 

625.87 

626.10 

626.33 

626.56 

94.7 

626.79 

627.02 

627.25 

627.49 

627.72 

627.95 

628.18 

628.41 

628.65 

628.88 

94.8 

629.11 

629.34 

629.58 

629.81 

630.04 

630.27 

630.51 

630.74 

630.97 

631.21 

94,9 

631.44 

631.67 

631.91 

632.14 

632.38 

632.61 

632.84 

633.08 

633.31 

633.55 

95.0 

633.78 

634.01 

634.25 

634.48 

634.72 

634.95 

635.18 

635.42 

635.65 

635.89 

95.1 

636.12 

636.35 

636.59 

636.82 

637.06 

637.29 

637.53 

637.76 

638.00 

638.23 

95.2 

638.47 

638.71 

638.94 

639.18 

639.41 

639.65 

639.89 

640.12 

640.36 

640.59 

95.3 

640.83 

641.07 

641.30 

641.54 

641.77 

642.01 

642.25 

642.48 

642.72 

642.95 

95.4 

643.19 

643.43 

643.67 

643.90 

644.14 

644.38 

644.62 

644.86 

645.09 

645.33 

95.5 

645.57 

645.81 

646.05 

646.28 

646.52 

646.76 

647.00 

647.24 

647.47 

647.71 

95.6 

647.95 

648.19 

648.43 

648.67 

648.91 

649.14 

649.38 

649.62 

649.86 

650.10 

95.7 

650.34 

650.58 

650.82 

651.06 

651.30 

651.53 

651.77 

652.01 

652.25 

652.49 

95.8 

652.73 

652.97 

653.21 

653.45 

653.69 

653.93 

654.17 

654.41 

654.65 

654.89 

95.9 

655.13 

655.37 

655.61 

655.85 

656.09 

656.33 

656.58 

656.82 

657.06 

657.30 

96.0 

657.54 

657.78 

658.02 

658.26 

658.50 

658.74 

658.99 

659.23 

659.47 

659.71 

96.1 

659.95 

660.19 

660.43 

660.68 

660.92 

661.16 

661.40 

661.64 

661.89 

662.13 

96.2 

662.37 

662.61 

662.86 

663.10 

663.34 

663.58 

663.83 

664.07 

664.31 

664.56 

96-3 

664.80 

665.04 

665.29 

665.53 

665.78 

666.02 

666.26 

666.51 

666.75 

667.00 

96.4 

667.24 

667.48 

667.73 

667.97 

668.22 

668.46 

668.71 

668.95 

669.20 

669.44 

96.5 

669.69 

669.93 

670.18 

670.42 

670.67 

670.91 

671.16 

671.40 

671.65 

671.99 

96.6 

672.14 

672.39 

672.63 

672.88 

673.12 

673.37 

673.62 

673.86 

674.11 

674.35 

96.7 

674.60 

674.85 

675.09 

675.34 

675.59 

675.83 

676.08 

676.33 

676.58 

676.82 

96.8 

677.07 

677.32 

677.57 

677.81 

678.06 

678.31 

678.56 

678.81 

679.05 

679.30 

96.9 

679.55 

679.80 

680.05 

680.29 

680.54 

680.79 

681.04 

681.29 

681.53 

681.78 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

0. 

1 

D 


100 


4       BAROMETRIC    PRESSURES    CORRESPONDING    TO    TEMPERATURES    OF    BOILING   WATER. 


Hundredths  of  a  Degree. 

Centig. 

Degrees. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

o 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

Millim. 

97.0 

682.03 

682.28 

682.53 

682.78 

683.03 

683.27 

683.52 

683.77 

684.02 

684.27 

97.1 

684.52 

684.77 

685.02 

685.27 

685.52 

685.77 

686.02 

686.27 

686.52 

686.77 

97.2 

687.02 

687.27 

687.52 

687.77 

688.02 

688.27 

688.53 

688.78 

689.03 

689.28 

97.3 

689.53 

689.78 

690.03 

690.28 

690.53 

690.78 

691.04 

691.29 

691.54 

691.79 

97.4 

692.04 

692.29 

692.54 

692.80 

693.05 

693.30 

693.55 

693.80 

694.06 

694.31 

97.5 

694.56 

694.81 

695.06 

695.32 

695.57 

695.82 

696.07 

696.32 

696.58 

696.83 

97.6 

697.08 

697.33 

697,59 

697.84 

698.09 

698.34 

698.60 

698.85 

699.10 

699.36 

97.7 

699.61 

699.86 

700.12 

700.37 

700.63 

700.88 

701.13 

701.39 

701.64 

701.90 

97.8 

702.15 

702.40 

702.66 

702.91 

703.17 

703.42 

703.68 

703.93 

704.19 

704.44 

97.9 

704.70 

704.96 

705.21 

705.47 

705.72 

705.98 

706.24 

706.49 

706.75 

707.00 

98.0 

707.26 

707.52 

707.77 

708.03 

708.28 

708.54 

708.80 

709.05 

709.31 

709.56 

.  98.1 

709.82 

710.08 

710.33 

710.59 

710.85 

711.10 

711.36 

711.62 

711.88 

712.13 

98.2 

712.39 

712.65 

712.91 

713.16 

713.42 

713.68 

713.94 

714.20 

714.45 

714.71 

98.3 

714.97 

715.22 

715.49 

715.75 

716.01 

716.26 

716.52 

716.78 

717.04 

717.30 

98.4 

717.56 

717.82 

718.08 

718.34 

718.60 

718.85 

719.11 

719.37 

719.63 

719.89 

98.5 

720.15 

720.41 

720.67 

720.93 

721.19 

721.45 

721.71 

721.97 

722.23 

722.49 

98.6 

722.75 

723.01 

723.27 

723.53 

723.79 

724.05 

724.31 

724.57 

724.83 

725.09 

98.7 

725.35 

725.61 

725.87 

726.13 

726.39 

726.65 

726.92 

727.18 

727.44 

727.70 

98.8 

727.96 

728.22 

728.48 

728.75 

729.01 

729.27 

729.53 

729.79 

730.06 

730.32 

98.9 

730.58 

730.84 

731.11 

731.37 

731.63 

731.89 

732.16 

732.42 

732.68 

732.95 

99.0 

733.21 

733.47 

733.74 

734.00 

734.27 

734.53 

734.79 

735.06 

73o.32 

735.59 

99.1 

735.85 

736.11 

736.38 

736.64 

736.91 

737.17 

737.44 

737.70 

737.97 

738.23 

99.2 

738.50 

738.77 

739.03 

739.30 

739.56 

739.83 

740.10 

740.36 

740.63 

740.89 

99.3 

741.16 

741.43 

741.69 

741.96 

742.23 

742.49 

742.76 

743.03 

743.30 

743.56 

99.4 

743.83 

744.10 

744.36 

744.63 

744.90 

745.16 

745.43 

745.70 

745.97 

746.23 

99.5 

746.50 

746.77 

747.04 

747.30 

747.57 

747.84 

748.11 

748.38 

748.64 

748.91 

99.6 

749.18 

749.45 

749.72 

749.99 

750.26 

750.52 

750.79 

751.06 

751.33 

751.60 

99.7 

751.87 

752.14 

752.41 

752.68 

752.95 

753.22 

753.49 

753.76 

754.03 

754.30 

99.8 

754.57 

754.84 

755.11 

7;55.38 

755.65 

755.92 

756.20 

756.47 

756.74 

757.01 

99.9 

757.28 

757.55 

757.82 

758.10 

758.37 

758.64 

758.91 

759.18 

759.46 

759.73 

100.0 

760.00 

760.27 

760.55 

760.82 

761.09 

761.36 

761.64 

761.91 

762.18 

762.46 

100.1 

762.73 

763.00 

763.28 

763.55 

763.82 

764.09 

764.37 

764.64 

764.91 

765.19 

100.2 

765.46 

765.73 

766.01 

766.28 

766.56 

766.83 

767.10 

767.38 

767.65 

767.93 

100.3 

768.20 

768.47 

768.75 

769.02 

769.30 

769.57 

769.85 

770.12 

770.40 

770.67 

100.4 

770.95 

771.23 

771.50 

771.78 

772.05 

772.33 

772.61 

772.88 

773.16 

773.43 

100.5 

773.71 

773.99 

774.26 

774.54 

774.82 

775.09 

775.37 

775.65 

775.93 

776.20 

100.6 

776.48 

776.76 

777.04 

777.31 

777.59 

777.87 

778.15 

778.43 

778.70 

778.98 

100.7 

779.26 

779.54 

779.82 

780.09 

780.37 

780.65 

780.93 

781.21 

781.48 

781.76 

100.8 

782.04 

782.32 

782.60 

782.88 

783.16 

783.43 

783.71 

783.99 

784.27 

784.55 

100.9 

784.83 

785.11 

785.39 

785.67 

785.95 

786.23 

786.51 

786.79 

787.07 

787.35 

101.0 

787.63 

787.91 

788.19 

788.47 

788.75 

789.03 

789.31 

789.59 

789.87 

790.15 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

101 


TABLE     XXV. 


BAROMETRIC  PRESSURES  CORRESPONDING  TO   TEMPERATURES  OF  THE 
BOILING  POINT   OF  WATER, 


EXPRESSED    IN    MILLIMETRES    OF    MERCURY    FOR   CENTIGRADE    TEMPERATURES. 


BY  REGNAULT,  REVISED  BY  MORITZ. 


Boiling 
Point, 
Centigrade. 

Barometer 
in 
Millimetres. 

Differ- 
ence. 

Boiling 
Point, 
Centigrade. 

Barometer 
in 
Millimetres. 

Differ- 
ence. 

Boiling 
Point, 
Centigrade. 

Barometer 
in 
Millimetres. 

Differ- 
ence. 

8°0.0 

354.62 

o 
83.0 

400.07 

o 
86.0 

450.30 

80.1 

356.06 

1.44 

83.1 

401.66 

1.60 

86.1 

452.06 

1.76 

80.2 

357.50 

1.45 

83.2 

403.26 

1.60 

86.2 

453.83 

1.77 

1.45 

1.61 

1.77 

80.3 

358.96 

83.3 

404.87 

86.3 

455.60 

80.4 

360.41 

1.46 

83.4 

406.48 

1.61 

86.4 

457.38 

1.78 

1.46 

1.62 

1.78 

80.5 

361.87 

83.5 

408.10 

86.5 

459.17 

1.47 

1.62 

1«79 

80.6 

363.34 

83.6 

409.72 

86.6 

460.96 

80.7 

364.81 

1.47 

83.7 

411.35 

1.63 

86.7 

462.75 

1.80 

1.48 

1.63 

1.80 

80.8 

366.29 

83.8 

412.98 

86.8 

464.55 

1.48 

1«64 

1.81 

80.9 

'367.77 

83.9 

414.62 

86.9 

466.36 

1.49 

1.64 

1.81 

81.0 

369.26 

84.0 

416.26 

87.0 

468.17 

1.49 

1.65 

1.82 

81.1 

370.75 

84.1 

417.91 

87.1 

469.99 

1.50 

1.66 

1.83 

81.2 

372.25 

84.2 

419.57 

87.2 

471.82 

81.3 

373.75 

1.50 

84.3 

421.23 

1.66 

87.3 

473.65 

1.83 

81.4 

375.25 

1.51 

84.4 

422.89 

1.67 

87.4 

475.49 

1.84 

1.51 

1.67 

1.84 

81.5 

376.77 

84.5 

424.56 

87.5 

477.33 

81.6 

378.28 

1.52 

84.6 

426.24 

1.68 

87.6 

479.18 

1.85 

1.52 

1.68 

1.86 

81.7 

379.81 

84.7 

427.92 

87.7 

481.04 

81.8 

381.33 

1.53 

84.8 

429.61 

1.69 

87.8 

482.90 

1.86 

81.9 

382.87 

1.53 

84.9 

431.30 

1.69 

87.9 

484.76 

1.67 

1.54 

1.70 

1.87 

82.0 

384.40 

85.0 

433.00 

88.0 

486.64 

82.1 

385.95 

1.54 

85.1 

434.71 

1.70 

88.1 

488.52 

1.88 

82.S 

387.49 

1.55 

85.2 

436.42 

1.71 

88.2 

490.40 

1.89 

82.3 

389.05 

1.55 

85.3 

438.13 

1.72 

88.3 

492.29 

1.89 

82.4 

390.61 

1.56 

85.4 

439.85 

1.72 

88.4 

494.19 

1.90 

1.56 

1.73 

1.90 

82.5 

392,17 

85.5 

441.58 

88.5 

496.09 

1.57 

1.73 

1.91 

82.6 

393.74 

85.6 

443.31 

88.6 

498.00 

1.57 

'  1.74 

1.92 

82.7 

395.31 

85.7 

445.05 

88.7 

500.92 

1.58 

1.74 

1.92 

82.8 

396.89 

85.8 

446.80 

88.8 

501.84 

1.58 

1.75 

1.93 

82.9 

398.48 

85.9 

448.55 

88.9 

503.77 

83.0 

400.07 

1.59 

86.0 

450.30 

1.76 

89.0 

505.70 

1.93 

D 


102 


BAROMETRIC    PRESSURES    CORRESPONDING    TO    THE    BOILING    POINT. 


Boiling 
Point, 
Centigrade. 

Barometer 
in 
Millimetres. 

Differ- 
ence. 

Boiling 
Point, 
Centigrade. 

Barometer 
in 
Millimetres. 

Differ- 
ence. 

Boiling 
Point, 
Centigrade. 

Barometer 
in 
Millimetres. 

Differ- 
ence. 

o 
89.0 

505.70 

93.0 

588.33 

o 
97.0 

681.93 

1.94 

2.20 

2.49 

89.1 

507.65 

93.1 

590.53 

97.1 

684.42 

1.95 

2.21 

2.50 

89.2 

509.59 

93.2 

592.74 

97.2 

686.92 

1.95 

2.22 

2.51 

89.3 

511.54 

93.3 

594.96 

97.3 

689.42 

1.96 

2.22 

2.51 

89.4 

513.50 

93.4 

597.18 

97.4 

691.94 

1.97 

2.23 

2.52 

89.5 

515.47 

93.5 

599.41 

97/5 

694.46 

1.97 

2.24 

2.53 

89.6 

517.44 

93.6 

601.65 

97.6 

696.98 

1.98 

2.24 

2.54 

89.7 

519.42 

93.7 

603.89 

97.7 

699.52 

89.8 

521.40 

1.98 

93.8 

606.14 

2.25 

97.8 

702.06 

2.54 

2.26 

2.55 

89.9 

523.39 

"   ' 

93.9 

608.40 

97.9 

704.62 

2.00 

2.26 

2.56 

90.0 

525.39 

94.0 

610.66 

98.0 

707.17 

90.1 

527.40 

2.00 

94.1 

612-93 

2.27 

98.1 

709.74 

2.57 

90.2 

529.41 

2.01 

94.2 

615.21 

2.28 

98.2 

712.31 

2.57 

90.3 

531.42 

2.02 

94.3 

617.50 

2.29 

98.3 

714.90 

2.58 

2.02 

2.29 

2.59 

90.4 

533.44 

94.4 

619.79  . 

98.4 

717.49 

2.  03 

2.30 

2.60 

90.5 

535.47 

94.5 

622.09 

98.5 

720.08 

90.6 

537.51 

2.04 

94.6 

624.39 

2.31 

98.6 

722.69 

2.61 

2.04 

2.31 

2.61 

90.7 

539.55 

94.7 

626.71 

98.7 

725.30 

2.05 

2.32 

2.62 

90.8 

541.60 

94.8 

629.93 

98.8 

727.93 

90.9 

543.65 

2.05 

94.9 

631.36 

2.33 

98.9 

730.55 

2.63 

2.06 

2.33 

2.64 

91.0 

545.71 

95.0 

633.69 

99.0 

733.19 

91.1 

547.78 

2.07 

95.1 

636.03 

2.34 

99.1 

735.84 

2.64 

91.2 

549.86 

2.07 

95.2 

638.38 

2.35 

99.2 

738.49 

2.65 

91.3 

551.94 

2.08 

95.3 

640.74 

2.36 

99.3 

741.15 

2.66 

91.4 

554.03 

2.09 

95.4 

643.10 

2.36 

99.4 

743.82 

2467 

2.09 

2.37 

2.68 

91.5 

556.12 

95.5 

645.48 

99.5 

746.50 

91.6 

558.22 

2.10 

95.6 

647.86 

2.38 

99.6 

749.18 

2.68 

2.11 

2.39 

2.69 

91.7 

560.33 

95.7 

650.24 

99.7 

751.87 

2.11 

2.39 

2.70 

91.8 

562.44 

95.8 

652.63 

99.8 

754.57 

91.9 

564.56 

2.12 

95.9 

655.04 

2.40 

99.9 

757.28 

2.71 

2.13 

2.41 

2.72 

92.0 

566.69 

96.0 

657.44 

100.0 

760.00 

2.13 

2.42 

2.73 

92.1 

568.82 

96.1 

659.86 

100.1 

762.73 

92.2 

570.96 

2.14 

96.2 

662.28 

2.42 

100.2 

'  765.46 

2.73 

92.3 

573.11 

2.15 

96.3 

664.71 

2.43 

100.3 

768.20 

2.74 

92.4 

575.27 

2.15 

96.4 

667.15 

2.44 

100.4 

770.95 

2.75 

2.16 

2.44 

2.76 

92.5 

577.43  . 

96.5 

669.59 

100.5 

773.71 

2.17 

2.45 

2.77 

92.6 

579.59 

96.6 

672.05 

100.6 

776.47 

92.7 

581.77 

2.17 

96.7 

674.51 

2.46 

100.7 

779.25 

2.77 

92.8 

583.95 

2.18 

96.8 

676.97 

2.47 

100.8 

782.03 

2.78 

92.9 

586.14 

2.19 

96.9 

679.45 

2.47 

100.9 

784.82 

2.79 

93.0 

588.33 

2.19 

97.0 

681.93 

2.48 

101.0 

787.62 

2.80 

D 


103 


TABLE     XXVI. 


BAROMETRIC  PRESSURES   CORRESPONDING  TO  TEMPERATURES   OF  THE 
BOILING  POINT   OF   WATER, 


EXPRESSED    IN    ENGLISH    INCHES    FOR    TEMPERATURES    OF    FAHRENHEIT. 


REDUCED  FROM  REGNAOLT'S  TABLE,  REVISED  Br  MORITZ. 


Boiling 
Point, 
Fahren. 

Barom- 
eter 
in 
English 
Inches. 

Differ- 
ence. 

Boiling 
Point, 
Fahren. 

Barom- 
eter 
in 
English 
Inches. 

Differ- 
ence. 

Boiling 
Point, 
Fahren. 

Barom- 
tter 
in 
English 
Inches. 

Differ- 
ence. 

Boiling 
Point, 
Fahren. 

Barom- 
eter 
in 
English 
Inches. 

Differ- 
ence. 

0 

185.0 

17.048 

188.0 

18.195 

o 
191.0 

19.407 

o 
194.0 

20.685 

185.1 

17.085 

0.037 

188.1 

18.235 

0.039 

191.1 

19.448 

0.042 

194.1 

20.729 

0.044 

.037 

.039 

.042 

.044 

185.2 

17.122 

188.2 

18.274 

191.2 

19.490 

194.2 

20.773 

1S5.3 

17.160 

.037 

188.3 

18.314 

.039 

191.3 

19.532 

.042 

194.3 

20.817 

.044 

.037 

.040 

.042 

.044 

185.4 

17.197 

188.4 

18.353 

191.4 

19.573 

194.4 

20.861 

.038 

.040 

.042 

.044 

185.5 

17.235 

188.5 

18.393 

191.5 

19.615 

194.5 

20.905 

.038 

.040 

.042 

.044 

1S5.6 

17.272 

188.6 

18.432 

191.6 

19.657 

194.6 

20.949 

.038 

.040 

.042 

.044 

185.7 

17.310 

188.7 

18.472 

191.7 

19.699 

194.7 

20.993 

185.8 

17.348 

.038 

188.8 

18.512 

.040 

191.8 

19.741 

.042 

194.8 

21.038 

.044 

.038 

.040 

.042 

.044 

185.9 

17.385 

188.9 

18.552 

191.9 

19.783 

194.9 

21.082 

.038 

.040 

.042 

.044 

186.0 

17.423 

189.0 

18.592 

192.0 

19.825  " 

195.0 

21.126 

.038 

.040 

.042 

.045 

1S6.1 

17.461 

189.1 

18.632 

192.1 

19.868 

195.1 

21.171 

1S6.2 

17.499 

.038 

189.2 

18.672 

.040 

192.2 

19.910 

.042 

195.2 

21.216 

.045 

18(h3 

17.537 

.038 

189.3 

18.712 

.040 

192.3 

19.952 

.042 

195.3 

21.260 

.045 

.038 

.040 

.042 

.045 

186.4 

17.575 

189.4 

18.753 

192.4 

19.995 

195.4 

21.305 

.038 

.040 

.043 

.045 

186.5 

17.614 

189.5 

18.793 

192.5 

20.037 

195.5 

21.350 

•038 

.040 

.043 

.045 

186.6 

17.652 

189.6 

18.833 

192.6 

20.080 

195.6 

21.395 

.038 

.040 

.043 

.045 

186.7 

17.690 

189.7 

18.874 

192.7 

20.123 

195.7 

21.440 

.038 

.041 

.043 

.045 

186.8 

17.729 

189.8 

18.914 

192.8 

20.166 

195.8 

21.485 

.038 

.041 

.043 

.045 

186.9 

17.767 

189.9 

18.955 

192.9 

20.208 

195.9 

21.530 

.039 

.041 

.043 

.045 

187.0 

17.806 

190.0 

18.996 

193.0 

20.251 

196.0 

21.576 

187.1 

17.844 

.039 

190.1 

19.036 

.041 

193.1 

20.294 

.043 

196.1 

21.621 

.045 

.039 

.041 

.043 

.045 

187.2 

17.883 

190.2 

19.077 

193.2 

20.338 

196.2 

21.666 

187.3 

17.922 

.039 

190.3 

19.118 

.041 

193.3 

20.381 

.043 

196.3 

21.712 

.046 

187.4 

17.961 

.039 

190.4 

19.159 

.041 

193.4 

20.424 

.043 

196.4 

21.758 

.046 

.039 

.041 

.043 

.046 

187.5 

18.000 

190.5 

19.200 

193.5 

20.467 

196.5 

21.803 

.039 

.041 

.043 

.046 

187.6 

18.039 

190.6 

19.241 

193,6 

20.511 

196.6 

21.S49 

.039 

.041 

.043 

.046 

187.7 

18.078 

190.7 

19.283 

193.7 

20.554 

196.7 

21.895 

.039 

.041 

.044 

.046 

187.8 

18.117 

190.8 

19.324 

193.8 

20.598 

196.8 

21.941 

039 

.041 

.044 

.046 

187.9 

18.156 

190.9 

19.365 

193.9 

20.641 

196.9 

21.987 

188.0 

18.195 

0.039 

191.0 

19.407 

0.041 

194.0 

20.685 

0.044 

197.0 

22.033 

0.046 

D 


104 


BAROMETRIC    PRESSURES    CORRESPONDING    TO    THE    BOILING    POINT. 


Boiling 
Point, 
Fahren 

Barom- 
eter 
in 
English 
Inches. 

S^3±? 

Qce"      Fahren 

Barom- 
eter 
in 
English 
Inches. 

Differ- 
ence. 

I 

Boiling 
Point, 
Fahren 

Barom- 
eter 
in 
English 
Inches. 

Differ- 
ence. 

Boiling 
Point, 
Fahren 

Barom- 
eter 
in 
English 
Inches. 

Differ- 
ence. 

1 

0 

o 

o 

o 

197.0 

22.033 

201.0 

23.943 

205.0 

25.990 

209.0 

28.180 

197.1 

22.079 

0.046 

201.1 

23.993 

0.049 

205.1 

26.043 

0.053 

209.1 

28.237 

0.057 

197.2 

22.125 

.046 

201.2 

24.042 

.050 

205.2 

26.096 

.053 

209.2 

28.293 

.057 

197.3 

22.172 

.046 

201.3 

24.092 

.050 

205.3 

26.149 

.053 

209.3 

28.350 

.057 

197.4 

22.218 

.046 

201.4 

24.142 

.050 

205.4 

26.202 

.053 

209.4 

28.407 

.057 

.046 

.050 

.053 

.057 

197.5 

22.264 

201.5 

24.191 

205.5 

26.255 

209.5 

28.464 

197.6 

22.311 

.047 

201.6 

24.241 

.050 

205.6 

26.309 

.053 

209.6 

28.521 

.057 

197.7 

22.358 

.047 

201.7 

24.291 

.050 

205.7 

26.362 

.054 

209.7 

28.579 

.057 

197.8 

22.404 

.047 

201.8 

24.341 

.050 

205.8 

26.416 

.054 

209.8 

28.636 

.057 

197.9 

22.451 

.047 

201.9 

24.391 

.050 

205.9 

26.470 

.054 

209.9 

28.693 

.057 

.047 

.050 

.054 

.058 

198.0 

22.498 

202.0 

24.442 

206.0 

26.523 

210.0 

28.751 

198.1 

22.545 

•°47      202.1 

24.492 

.050 

206.1 

26.577 

.054 

210.1 

28.809 

.053 

198.2 

22.592 

.047 

202.2 

24.542 

.050 

206.2 

26.631 

.054 

210.2 

28.866 

.058 

198.3 

22.639 

•  047 

202.3 

24.593 

.050 

206.3 

26.685 

.054 

210.3 

28.924 

.058 

198.4 

22.686 

.047 

202.4 

24.644 

.051 

206.4 

26.740 

.054 

210.4 

28.982 

.058 

.047 

.051 

.054 

.058 

198.5 

22.734 

202.5 

24.694 

206.5 

26.794 

210.5 

29.040 

198.6 

22.781 

.047 

202.6 

24.745 

.051 

206.6 

26.848 

.054 

210.6 

29.098 

.058 

198.7 

22.829 

.047 

202.7 

24.796 

.051 

206.7 

26.903 

.054 

210.7 

29.156 

.058 

198.8 

22.876 

.048 

202.8 

24.847 

.051 

206.8 

26.957 

.055 

210.8 

29.215 

.058 

198.9 

22.924 

.048 

202.9 

24.898 

.051 

206.9 

27.012 

.055 

210.9 

29.273 

.058 

.048 

.051 

.055 

.059 

199.0 

22.971 

203.0 

24.949 

207.0 

27.066 

211.0 

29.331 

199.1 

23.019 

.048 

203.1 

25.000 

.051 

207.1 

27.121 

.055 

211.1 

29.390 

.059 

199.2 

23.067 

.048 

203.2 

25.051 

.051 

207.2 

27.176 

.055 

211.2 

29.449 

.059 

199.3 

23.115 

.048 

203.3 

25.103 

.051 

207.3 

27.231 

.055 

211.3 

29.508 

.059 

199.4 

23.163 

.048 

203.4 

25.154 

.051 

207.4 

27.286 

.055 

211.4 

29.566 

.059 

.048 

.052 

.055 

.059 

199.5 

23.211 

203.5 

25.206 

207.5 

27.341 

211.5 

29.625 

199.6 

23.259 

.048 

203.6 

25.257 

.052 

207,6 

27.397 

.055 

211.6 

29.684 

•059 

199.7 

23.308 

.048 

203.7 

25.309 

.052 

207.7 

27.452 

.055 

211.7 

29.744 

.059 

199.8 

23.356 

.048 

203.8 

25.361 

.052 

207.8 

27.507 

.055 

211.8 

29.803 

.059 

199.9 

23.405 

.048 

203.9 

25.413 

.052 

207.9 

27.563 

.056 

211.9 

29.862 

.059 

.049 

.052 

.056 

.059 

200.0 

23.453 

204.0 

25.465 

208.0 

27.618 

212.0 

29.922 

200.1 

23.502 

.049 

204.1 

25.517 

.052 

208.1 

27.674 

.056 

212.1 

29.981 

.060 

200.2 

23.550 

.049 

204.2 

25.569 

.052 

208.2 

27.730 

.056 

212.2 

30.041 

.060 

200.3 

23.599 

.049 

204.3 

25.621 

.052 

208.3 

27.786 

.056 

212.3 

30.101 

.060 

200.4 

23.648 

.049 

204.4 

25.674 

.052 

20S.4 

27.842 

.056 

212.4 

30.161 

.060 

.049 

.052 

.056 

.060 

200.5 

23.697 

204.5 

25.726 

208.5 

27.898 

212.5 

30.221 

200.6 

23.746 

.049 

204.6 

25.779 

.053    i 

208.6 

27.954 

.056 

212.6 

30.281 

.060 

200.7 

23.795 

.049 

204.7 

25.831 

.053 

208.7 

28.011 

.056 

212.7 

30.341 

.060 

200.8 

23.845 

•°49      204.8 

25.884 

.053 

208.8 

28.067 

.056 

212.8 

30.401 

.060 

200.9 

23.894 

.049 

204.9 

25.937 

.053 

208.9 

28.123 

.056 

212.9 

30.461 

.060 

201.0 

23.943 

0.049 

205.0 

25.990 

0.053 

209.0 

28.180 

0.057 

213.0 

30.522 

0.060 

D 


105 


APPENDIX 


THE    HYPSOMETRICAL    TABLES. 


COMPARISON  OF  THE  DIFFERENT  MEASURES  OF  LENGTH  MOST  GENERALLY  USED 
FOR  INDICATING  ALTITUDES. 


D  107 


COMPARISON 


OF  THE  MEASURES  OF  LENGTH  MOST  GENERALLY  USED  FOR  INDICATING  ALTITUDES. 


IT  is  too  well  known  that  the  measures  used  in  scientific  researches  among  civilized 
nations  are  not  uniform,  as  the  convenience  of  all  would  require.  In  France  the 
metre  is  employed  ;  in  England  and  North  America,  the  yard  and  its  third  part,  the 
English  foot ;  in  Germany,  most  commonly,  the  Old  French  or  Paris  foot,  the  sixth 
part  of  the  French  toise  called  the  Toise  du  Perou ;  at  the  same  time,  however, 
though  not  so  extensively,  the  Rhine  foot,  in  Denmark  and  Holland,  and  especially 
in  Prussia,  where  it  has  been  declared,  under  the  name  of  Prussian  foot,  the  legal 
measure  in  that  kingdom  ;  in  Austria,  the  klafter  of  Vienna  and  its  sixth  part,  the 
foot  of  Vienna ;  in  Switzerland,  the  Swiss  or  federal  foot,  which  has  been  adjusted 
to  the  metrical  system,  and  is  three  tenths  of  a  metre  ;  and  so  on. 

The  numerous  altitudes  ascertained,  either  by  private  efforts,  or  in  connection  with 
the  public  works,  and  quite  especially  with  the  extensive  geodetic  operations  carried 
on  by  the  governments  of  these  various  countries  for  the  survey  of  a  regular  map,  are 
expressed  in  the  measures  respectively  adopted  by  each  of  them.  These  heights, 
however,  before  they  can  be  compared,  require  to  be  uniformly  reduced  to  any  one 
of  these  measures.  Their  relation  to  each  other,  therefore,  is  given  here,  together 
with  numerous  reduction  tables,  designed  to  save  both  the  useless  expenditure  of  time 
and  the  almost  unavoidable  errors  arising  from  so  numerous  reductions. 

The  exact  relation  of  the  standard  measures  above  mentioned  is  not  easily  ascer- 
tained, and  the  numbers  given  by  the  best  authorities  by  no  means  always  agree  ; 
for  the  manufacture  of  exact  copies  of  a  standard  scale,  and  the  accurate  comparison 
of  it,  require  considerable  skill,  and  belong  to  the  most  delicate  operations  of  physics. 
The  numbers  used  for  computing  the  following  tables  have  been  adopted,  after  a 
careful  review  of  the  authorities,  as  the  most  reliable.  A  few  words  on  the  most 
important  original  legal  standards  of  measures  may  not  be  unwelcome.  For  further 
details  on  the  subject  the  reader  is  referred  principally  to  Dove's  work,  Maas  und 
Messen,  2d  edition,  Berlin,  1835. 

The  principal  original,  legal  standards  are  the  following  :  — 

1.  The  Toise  du  Perou,  the  old  French  standard,  made  in  1735,  in  Paris,  by  Lan- 
glois,  under  the  direction  of  Godin,  is  a  bar  of  iron  which  has  its  standard  length  at 
the  temperature  of  13°  Reaumur.  It  is  known  as  the  Toise  du  Perou,  because  it  was 
used  by  the  French  Academicians  Bouguer  and  La  Condamine  in  their  measurement 

D  109 


COMPARISON    OF    THE    VARIOUS    MEASURES    OF   LENGTH 

of  an  arc  of  the  meridian  in  Peru.  What  follows  will  show  that  it  may  almost 
be  called  the  only  common  standard,  to  which  all  the  others  are  referred  for  com- 
parison. 

2.  The  Metre  is  a  standard  bar  of  platina,  made  by  Lenoir  in  Paris,  which  has  its 
normal  length  at  the  temperature   of  zero  Centigrade,  or  the  freezing  point.     Its 
length  is  intended  to  make  it  a  natural  standard,  and  to  represent  the  ten-millionth 
part  of  the  terrestrial  arc  comprised  between  the  equator  and  the  pole,  or  of  a  quarter 
of  the  meridian.     The  length  of  this  arc  given  by  the  measurement  ordered  for  the 
purpose  by  the  Assemblee  Nationale,  of  the  arc  of  the  meridian  between  Barcelona, 
through  France,  to  Dunkirk,  combined  with  the  measurements  previously  made  in 
Peru  and  in  Lapland,  gave  for  the  distance  of  the  equator  from  the  pole  5,130,740 
toises,  with  an  ellipticity  of  ^J^,  and  for  the  length  of  the  metre  443.29596  lines  of 
the  toise  du  Perou,  assumed  to  be  443.296  lines,  or  3  feet  11.296  lines.     This  last 
quantity  was  declared    in  1799  to  be  the  length   of  the   legal  metre,  and  vrai  et 
definitif,  and'  is  the  length  of  Lenoir's  platina  standard.     Later  and  more  extensive 
measurements   in  various  parts  of  the   globe,  however,  seem   to  indicate  that  this 
quantity  is  somewhat  too  small.     The  latest  and  most  exact  results  we  now  possess, 
combined  and  computed  by  Bessel,  would  make  the  quarter  of  the  meridian  10,000,856 
metres,  and  the  metre  =  443.29979  Paris  lines ;  Schmidt's  computation  would  make 
it  443.29977  lines,  and  both  numbers  are  confirmed  by  Airy's  results.     The  legal 
metre  is  thus,  in  fact,  as  Dove  remarks,  a  legalized  part  of  the  toise  du  Perou,  and 
this  last  remains  the  primitive  standard.     But  it  must  be  added  that  a  natural  standard, 
in  the  absolute  sense  of  the  word,  is  a  Utopian  one,  which  ever-changing  Nature 
never  will  give  us.     The  metre  is,  for  all  practical  purposes,  what  it  was  intended 
to  be,  a  natural  standard  ;  though  it  must  be  confessed  that,  in  practice,  the  ques- 
tion is  not  whether  and  how  far  a  standard  is  a  natural  or  a  conventional  one,  but  how 
readily  and  accurately  it  can  be  obtained,  or  recovered  when  lost. 

3.  The  English  Standard  Yard  is  a  brass  bar,  made  by  Bird  in  1760,  which  was 
declared,  by  act  of  Parliament,  1st  May,  1825,  the  legal  measure  of  length  when  at 
the  temperature  of  62°  Fahrenheit,  under  the  name  of  Imperial  Standard.     Another 
standard,  sometimes  also  called  Parliamentary  Standard,  was  made  by  Bird  in  1758. 
Sir  George  Schuckburgh  found  both  to  be  nearly  identical,  at  least  within  0.0002  of 
an  inch.     (Philos.  Trans,  for  1798,  p.  170.) 

Another  scale  of  brass,  however,  made  by  Troughton  for  Sir  George  Schuckburgh, 
described  in  the  Philosophical  Transactions  for  1798,  and  known  as  Schuckburgh's 
scale,  obtained  among  scientific  men,  perhaps,  a  higher  degree  of  authority,  on 
account  of  the  great  accuracy  of  its  division,  and  of  its  apparatus,  devised  by 
Troughton,  for  delicate  comparisons.  That  scale  was  used  by  Captain  Kater,  in 
1818,  in  his  researches  for  determining  the  length  of  the  pendulum  beating  a  second 
at  London,  and  also  the  length  of  the  metre,  expressed  in  English  inches  of  the 
imperial  standard.  (Phil.  Trans,  for  1818.) 

Numerous  attempts  to  determine  the  relation  between  the  English  and  the  French 
measures  show  no  inconsiderable  discrepancies  in  their  results.  Omitting  the  older 
comparisons  with  the  toise,  we  give  here  the  value  of  the  metre  in  English  imperial 
inches,  as  resulting  from  the  most  reliable  comparisons. 

A  standard  scale  made  and  divicfed  by  Troughton,  and  in  all  particulars  identical 

D  110 


USED    FOR    INDICATING-   ALTITUDES. 

with  Shuckburgh's  scale,  was  brought  to  France  in  1801  by  Pictet.  The  comparison 
of  it  with  the  standard  metre,  made  by  Prony,  Legendre,  and  Mechain,  gave,  after 
due  reduction  of  the  two  standards  to  their  respective  normal  temperatures, 

1  metre  at  32°  Fahr.  =  39.371  English  imperial  inches  at  62°  Fahr. 
This  determination  was  adopted  for  all  reductions  in  Kelly's  Universal  Cambist,  and 
in  the  French  translation  of  the  work,  published  in  Paris  in  1823. 

A  new  comparison  was  made  with  great  care  by  Captain  H.  Kater,  in  1818.  (See 
Philos.  Trans,  for  1818,  p.  103.)  The  standards  used  were  a  brass  scale  metre,  by 
Fortin,  terminated  with  parallel  planes  (metre  a  louts),  and  a  bar  of  platina  on  which 
the  length  of  the  metre  was  marked  by  two  very  fine  lines  (metre  a  traits).  Both 
were  compared  with  Shuckburgh's  scale,  and  a  double  series  of  experiments  gave  as 
the  mean  result : 

Brass  metre  at  32°  Fahr.  =  39.37076  inches  of  Shuckburgh's  scale  at  62°  Fahr. 
Platina  metre  at  32°  Fahr.  =  39.37081         "  "  "  "      .     " 

Mean        39.37079         "  *c  "  "  " 

On  this  value  of  the  metre  are  based  the  reduction  tables  by  Matthieu,  published 
yearly  in  the  Annuaire  du  Bureau  des  Longitudes ;  and  it  has  come  into  general 
use,  both  in  Europe  and  in  this  country. 

Captain  Kater  gives  besides,  in  the  same  paper,  p.  109,  note,  the  value  of  the 
metre  compared  with  Bird's  Parliamentary  standard  as  being 

1  metre  at  32°  F.  =  39.37062  imp.  inches  of  Bird's  Parliamentary  standard  at  62°  F. 
This  value  has  been  adopted  by  Dove,  as  being  the  legal  one,  in  his  reduction  tables 
in  his  work,  Maas  und  Messen,  p.  175,  &c.,  and  by  many  German  authorities. 

According  to  Baily's  experiments,  made  in  1835,  when  engaged  in  constructing  a 
new  standard  for  the  Royal  Astronomical  Society  (Memoirs  R.  Ast.  Soc.,  Vol.  IX.), 
the  value  of  the  metre  is  (Lee,  Collection  of  Talks  and  Formula,  p.  62) 

1  metre  at  32°  F.  =  39.370092  imperial  standard  inches  at  62°  F. 

The  original  legal  standards  having  been  lost  in  the  fire  which  destroyed,  several 
years  ago,  the  Parliament  Houses,  an  act  of  Parliament  provided  for  the  construc- 
tion of  new  ones  ;  but  as  the  report  of  the  committee  having  charge  of  the  con- 
struction of  the  new  British  standard  has  not  yet  been  published,  the  discussion  of 
the  subject  must  be  postponed. 

The  value  adopted  in  the  following  tables,  is  that  determined  by  Captain  Kater, 
viz.  1  metre  =  39.37079  English  inches. 

It  may  not  be  out  of  place  to  remark  that  Schumacher,  in  the  first  edition  of  his 
Sammlung  von  Hulfstafeln,  used  the  value  1  metre  =  39.3827  English  inches,  as 
given  in  the  Base  du  Si/steme  Metrique ;  but  this  number,  which  expresses  the  rela- 
tion of  both  standards  when  at  the  freezing  point,  becomes  39.37079  when  they  are 
respectively  reduced  to  their  normal  temperatures.  Schumacher's  tables,  therefore, 
must  be  corrected  accordingly. 

4.  The  actual  standard  of  length  of  the  United  States  is  a  brass  scale  of  eighty- 
two  inches  in  length,  prepared  for  the.  Coast  Survey  of  the  United  States,  by  Trough- 
ton  of  London,  meant  to  be  identical  with  the  English  Imperial  Standard,  and  depos- 
ited in  the  office  of  weights  and  measures.  The  temperature  at  which  it  is  a  standard 
is  62°  Fahrenheit,  and  the  yard  measure  is  between  the  27th  and  63d  inches  of  the 

D  111 


COMPARISON    OF    THE    VARIOUS    MEASURES    OF    LENGTH 

scale.     (See  Report  on  the  Construction  and  Distribution  of  Weights  and  Measures, 
by  Prof.  A.  D.  Bache,  1857.) 

Hasster,  first  Superintendent  of  the  United  States  Coast  Survey,  made  an  elaborate 
comparison  of  eleven  different  standard  metres  with  the  brass  scale  of  eighty-two 
inches,  by  Troughton.  Three  of  the  standard  metres,  certified  to  be  correct  by  high 
authorities,  seem  to  deserve  especial  confidence  :  —  1.  An  iron  metre,  presented  to 
Mr.  Hassler  by  Tralles,  which  was  one  of  the  three  that  Tralles  had  made  by  Lenoir 
at  the  same  time  with  those  distributed  to  the  committee  on  the  weights  and  measures. 
2.  Another  metre  of  iron,  also  by  Lenoir,  verified  by  Bouvard  and  Arago,  and  de- 
clared by  them  to  be  identical  with  the  original.  3.  A  platina  standard  by  Fortin, 
verified  by  Arago.  and  found  to  be  T^^  of  a  millimetre  too  long,  for  which  error 
allowance  was  made.  Their  comparison  with  the  Troughton  scale  at  the  tempera- 
ture of  the  freezing  point  gave  : 

1.  Iron  metre  of  Tralles     =  39.3809171  inches  of  the  Troughton  scale. 

2.  Iron  metre  of  Lenoir      =  39.3799487  "  " 

3.  Platina  metre  of  Fortin  =  39.3804194  " 

Or,  correcting  for  expansion,  and  reducing  them  to  their  respective  standard  temper- 
atures : 

1.  Iron  metre  of  Tralles  at  32°  F.     =  39.36850   )  _ 

r>    T  n        •      *  ooo  T?  on  OMKA   (  English  inches  of  the  Trough- 

2.  Iron  metre  of  Lenoir  at  32    F.      =  39.36754  > 

,     r>,      •  r  -o       •  ono  T?  on  o*-/on    \  tOn  SCa^G  °^  ®2  inches  at  62°  F. 

3.  Platina  metre  of  Fortin  at  32    F.  =  39.36789  ) 

Hassler,  in  his  Report  to  Congress  on  Weights  and  Measures,  in  1832,  adopts  the 
first  value,  viz. : 

1  metre  at  32°  F.  =  39.3809171  inches  of  the  Troughton  scale  at  32°  F  ; 
and  the  Troughton  scale  was  declared  the  United  States  standard,  from  which  copies 
were  to  be  made. 

This  value  materially  differs  from  those  given  by  other  careful  comparisons,  while, 
on  the  other  hand,  the  close  accordance  of  the  numbers  corresponding  to  the  various 
standard  metres  proves  the  accuracy  of  Hassle r's  method  and  comparison.  It  is, 
therefore,  difficult  not  to  ascribe,  with  Baily,  this  discrepancy  to  some  inaccuracy  in 
the  length  of  the  Troughton  scale  of  82  inches.  But  as  that  scale  has  been  declared 
the  standard  of  length  of  the  United  States,  it  seems  better  to  call  it,  as  is  done  in  the 
Coast  Survey  Reports,  the  American  yard,  and  its  subdivisions  the  American  foot 
and  inch,  and  to  consider  it  as  a  new  standard,  similar  to,  but  not  identical  with,  the 
English  imperial  standard.  The  value  of  the  metre  expressed  in  American  standard 
inches  is  given  in  the  Coast  Survey  Report  for  1853,  as 

1  metre  at  32°  F.  =  39.36850535  United  States  standard  inches  at  62°  F. 

We  learn  from  the  Report  on  Weights  and  Measures,  by  Prof.  A.  D.  Bache,  1857, 
p.  18,  that  two  copies  of  the  new  British  standards,  now  in  progress  of  construction, 
viz.  a  bronze  standard,  No.  11,  and  a  malleable  iron  standard,  No.  57,  have  been  pre- 
sented by  the  British  government  to  the  United  States.  A  series  of  careful  compari- 
sons, made  in  1856,  by  Mr.  Saxton,  under  the  direction  of  Prof.  A.  D.  Bache,  of  the 
British  bronze  standard,  No.  11,  with  the  Troughton  scale  of  eighty -two  inches, 
showed  that  the  British  bronze  standard  yard  is  shorter  than  the  American  yard  by 
0.00087  inch. 

D  112 


USED    FOR    INDICATING    ALTITUDES. 

Comparisons  of  the  American  standards  with  new  French  standards,  recently  pre- 
sented to  the  United  States  by  the  French  government,  are  still  in  progress. 

For  the  present,  however,  it  seems  best  to  adhere  to  the  value  of  the  metre,  ex- 
pressed in  American  standard  inches,  adopted  by  the  Coast  Survey  as  given  above. 
From  this  value  the  separate  tables,  which  will  be  found  below,  for  the  reduction  of 
the  American  yard  and  foot,  were  computed. 

5.  The  Klafter  of  Vienna  is  a  silver  line  let  into  a  prismatic  bar  of  iron,  on  which 
the  length  of  the  klafter  was  engraved  by  Voigtlander.     It  has  its  normal  length  at 
13°  Reaumur,  and  was  declared  by  law,  in   1816,  the  standard  klafter  of  Vienna. 
On  the  same  silver  line  the  French  toise  is  marked,  from  the  standard  toise  sent,  in 
1760,  by  La  Caille  and  La  Condamine  to  the  Observatory  of  Vienna.     According  to 
Berghaus's  Tables,  in  his   Grundriss  der  Geographie,  the  value   of  the  klafter  of 
Vienna  is  840.76134  French  lines  of  the  toise  du  Perou. 

6.  The  Prussian  Foot  is  marked  on  a  standard  iron  bar,  3  feet  long,  made  by  Pistor 
in  Berlin ;  it  is  a  standard  at  the  temperature  of  13°  Reaumur.     The  length  of  the 
Prussian  foot  was  declared  by  law  to  be  =  139.13  lines  of  the  toise  du  Perou. 

7.  A  Mexican  Vara,  the  standard  length,  brought  from  Mexico  at  the  close  of  the 
war,  by  Major  Turnbull  of  the  Topographical  Engineers,  was  presented  to  the  Office 
of  Weights  and  Measures.     This  standard  was  made  by  soldering  sheet-brass  upon 
the  tinned  surface  of  an  iron  bar.     A  careful  comparison  of  its  length  with  the  Amer- 
ican standard  was  made  under  the  direction  of  Prof.  Bache,  which  gave  its  length 
to  be  =  32.9682  inches  at  58°.7  Fahrenheit,  or  32.9680  when  reduced  to  62°  Fah- 
renheit. 

The  relation  of  that  particular  Mexican  standard  to  the  Spanish  standard  not  being 
known,  it  was  thought  better  to  adopt,  for  the  present,  the  value  of  the  Spanish  Vara, 
and  of  its  third  part,  the  Castilian  foot,  found  in  Thionville,  Traite  des  Poids  et 
Mesures,  &c.,  in  Balbi's  Abrege  de  Geographic,  viz.  1  vara  =  0.847965  metre. 

From  the  fundamental  equations  indicated  above  have  been  derived  all  those  which 
have  been  used  for  computing  the  reduction  tables  given  in  the  Appendix.  At  the 
head  of  each  table  will  be  found  the  value  from  which  it  was  computed. 

The  tables  are  so  arranged  as  to  give  directly  the  reduction  of  any  whole  number 
not  exceeding  three  or  four  figures,  and  larger  numbers  within  the  limits  needed  for 
altitudes,  by  means  of  a  single  addition. 

Example. 

Reduce  25,351  English  feet  into  metres. 

In  Table  XVI.,  on  the  line  beginning  with  25,000  and  in  the  column  headed  300, 
take  for  25,300  ='  7711.30  metres. 

In  the  second  part  of  the  table,  on  the  line  beginning 

with  50,  and  in  column  headed  1,  take  for  51  =       15.54      " 

English  feet       25,351  =  7726.84      " 

The  fractions,  which  seldom  occur,  are  treated  as  whole  numbers,  taking  care  only 
properly  to  move  the  decimal  point. 

Tables  XL.  to  XLIV.  will  be  found  convenient  for  converting  fractional  parts  of  a 
toise  or  of  a  foot  into  each  other. 

D  113 


TO    CONVERT 
FRENCH     TOISES 

INTO  DIFFERENT  MEASURES   OF  LENGTH. 


I.    CONVERSION    OF    FRENCH    TOISES    INTO    METRES. 
1  Toise  =  1.94903659  Metre. 


Units. 

Toises. 
Tens. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

0 

0.000 

1.949 

3.898 

5.847 

7.796 

9.745 

11.694 

13.643 

15.592 

17.541 

10 

19.490 

21.439 

23.388 

25.337 

27.287 

29.236 

31.185 

33.124 

35.073 

37.022 

20 

38.931 

40.930 

42.879 

44.S28 

46.777 

48.726 

50.675 

52.624 

54.573 

56.522 

30 

58.471 

60.420 

62.369 

64.318 

66.267 

68.216 

70.165 

72.114 

74,063 

76.012 

40 

77.961 

79.911 

81.860 

83.809 

85.758 

87.707 

89.656 

91.605 

93.554 

95.503 

50 

97.452 

99.401 

101.350 

103.299 

105.248 

107.197 

109.146 

111.095 

113.044 

114.993 

60 

116.942 

118.891 

120.840 

122.789 

124.738 

126.687 

128.636 

130.585 

132.534 

134.484 

70 

136.433 

138.382 

140.331 

142.280 

144.229 

146.178 

148.127 

150.076 

152.025 

153.974 

80 

155.923 

157.872 

159.821 

161.770 

163.719 

165.668 

167.617 

169.566 

171.515 

173.464 

90 

175.413 

177.362 

179.311 

181.260 

183.209 

185.158 

187.108 

189.057 

191.006 

192.955 

Hundreds. 

Thousands. 

0. 

100. 

200. 

300. 

400. 

500. 

600. 

700. 

800. 

900. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

0 

0.00 

194.90 

389.81 

584.71 

779.61 

974.52 

1169.42 

1364.33 

1559.23 

1754.13 

1000 

1949.04 

2143.94 

2338.84 

2533.75 

2728.65 

2923.55 

3118.46 

3312.36  3507.27 

3702.17 

2000 

3898.07 

4092.98 

4287.88 

4482.78 

4677.69 

4872.59 

5067.50 

5262.40'S457.30 

5652.21 

3000 

5847.11 

6042.01 

6236.92 

6431.82 

6626.72 

6821.63 

7016.53 

7211.44  7406.34 

7601.24 

4000 

7796.15 

7991.05 

8185.95 

8380.86 

8575.76 

8770.66 

8965.57 

9160.47 

9355.38 

9550.28 

5000 

9745.18 

9940.09 

10135.0 

10329.9 

10524.8 

10719.7 

10914.6 

11109.5 

11304.4 

11499.3 

II.    CONVERSION    OF    TOISES    INTO    FRENCH    OR   PARIS    FEET. 

1  Toise  =  6  French  Feet. 

Units. 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Par  Feet 

Par.Feet. 

Par.Feet. 

Par.Feet. 

Par.Feet. 

Par  Feet. 

Par.Feet. 

Par.Feet 

Par  Feet 

Par.Feet. 

0 

0.00 

6 

12 

18 

24 

30 

36 

42 

48 

54 

10 

60 

66 

72 

78 

84 

90 

96 

102 

108 

114 

20 

120 

126 

132 

138 

144 

150 

156 

162 

168 

174 

30 

180 

186 

192 

198 

204 

210 

216 

222 

228 

234 

40 

240 

246 

252 

258 

264 

270 

276 

282 

288 

294 

50 

300 

306 

312 

318 

324 

330 

336 

342 

348 

354 

60 

360 

366 

372 

378 

384 

390 

396 

402 

408 

414 

70 

420 

426 

432 

438 

444 

450 

456 

462 

468 

474 

60 

480 

486 

492 

498 

504 

510 

516 

522 

528 

534 

90 

540 

546 

552 

558 

564 

570 

576 

582 

588 

594 

D 


114 


III.    CONVERSION    OF    FRENCH    TOISES    INTO    ENGLISH    FEET    AND    DECIMALS. 
1  Toise  =  6.394590  English  Feet. 


Units. 

Tens. 

0.           1. 

,|.. 

4. 

5. 

6.          7. 

8. 

9. 

Eng.  feet 

Eng.  feet. 

Eng  feet. 

Eng  feet. 

Eng.  feet. 

Eng  feet. 

Eng.  feet. 

Eng  feet.  Eng.  feet. 

Eng.  feet. 

0 

0.000 

6.395 

12.789 

19.184 

25.578 

31.973 

38.368 

44.762 

51.157 

57.551 

10 

63.946 

70.340 

'  76.735 

83.130 

89.524 

95.919 

102.313 

108.708 

115.103 

121.497 

20 

127.892 

134.286 

140.681 

147.076 

153.470 

159.865 

166.259  172.654  179.049 

185.443 

30 

191.838 

198.232 

204.627 

211.021 

217.416 

223.811 

230.205 

236.600  242.99-J 

249.389 

40 

255.784 

262.178 

268.573 

274.967 

281.362 

287.757 

294.151 

300.546 

306.940 

313.335 

50 

319.729 

326.124 

332.519 

338.913 

345.308 

351.702 

358.097 

364.492 

370.886 

377.281 

60 

383.675 

390.070 

396.465 

402.859 

409.254 

415/648 

422.043 

428.438 

434.832 

441.227 

70 

447.621 

454.016 

460.410 

466.805 

473.200 

479.594 

485.989 

492.383 

498.778 

505.173 

80 

511.567 

517.962 

524.356 

530.751 

537.146 

543.540 

549.935 

556.329  562.724 

569.119 

90 

575.513  581.908  588.302 

594.697  601.091 

607.486 

613.881  620.275  626.670 

633.064 

Hundreds. 

Thousands. 

o. 

100. 

200. 

3OO.  |  1OO. 

500. 

6OO. 

TOO. 

soo. 

9OO. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng  feet 

Eng  feet. 

Eng  feet. 

0 

0.0 

639.5 

1278.9 

1918.4 

2557.8 

3197.3 

3836.8 

4476.2 

5115.7 

5755.1 

1000 

6394.6 

7034.0 

7673.5 

8313.0 

8952.4 

9591.9 

10231.3 

10870.8 

11510.3 

12149.7 

2000 

12789.2 

13428.6 

14068.1 

14707.6 

15347.0 

15986.5 

16625.9 

17265.4 

17904.9 

18544.3 

3000 

19183.8 

19823.2 

20462.7 

21102.1 

21741.6 

22381.1 

23020.5 

23660.0 

24299.4 

24938.9 

4000 

25578.4 

26217.8 

26857.3 

27496.7  28136.2 

28775.7 

29415.1 

30054.6  30691.0 

31333.5 

5000 

31972.9 

32612.4 

33251.9 

33891.3  j  34530.8 

35170.2 

35809.7 

36449.2  137088.  6 

37728.1 

IV.     CONVERSION    OF    FRENCH    TOISES    INTO    AMERICAN    FEET. 

1  Toise  =  6.394219  American  Feet. 

Units. 

Ten, 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Am.  Feet. 

Am.Feet 

Am.Feet. 

Am.Feet. 

Am.Feet. 

Am.  Feet 

Am.Feet   Am  Feet. 

Am.Feet. 

Am.Feet. 

0 

0.000 

6.394 

12.788 

19.183 

25.577 

31.971 

38.365    44.760 

51.154 

57.548 

10        ll   63.942 

70.336 

76.731 

83.125 

89.519 

95.913 

102.308  j  108.702 

115.096 

121.490 

20          127.884 

134.279 

140.673 

147.067 

153.461 

159.855 

166.250  172.644 

179.038 

185.432 

30 

191.827 

198.221 

204.615 

21.1.009 

217.403 

223.798 

230.192^36.586 

242.980 

249.375 

40 

255.769 

262.163 

268.557 

274.951 

281.346 

287.740 

294.134 

300.528 

306.923 

313.317 

50 

319.711 

326.105 

332.499 

338.894 

345.288 

351.682 

358.076 

364.470 

370.865 

377.259 

60 

383.653 

390.047 

396.442 

402.836 

409.230 

415.624 

422.018 

428.413 

434.807 

441.201 

70 

447.595 

453.990 

460.384 

466.778 

473.172 

479.566 

485.961 

492.355 

498.749 

505.143 

80 

511.538 

517.932 

524.326 

530.720 

537.114 

543.509 

549.903 

556.297 

562.691 

569.085 

90 

575.480 

581.874 

588.268 

594.662 

601.057 

607.451 

613.845  620.239 

626.633 

633.028 

Hundreds. 

Thousands. 

0. 

100. 

200. 

300. 

400. 

500. 

6OO. 

TOO. 

SOO.     9OO. 

Am.  Feet 

Am  Feet 

Am  Feet 

Am  Feet 

Am.Feet. 

Am  Feet 

Am  Feet. 

Am  Feet 

Am  Feet 

Am.  Feet. 

0                0.0 

639.4 

1278.8 

1918.3 

2557.7 

3197.1 

3836.5 

4476.0 

5115.4 

5754.8 

1000      !    6394.2 

7033.6 

7673.1 

8312.5 

8951.9 

9591.3 

10230.8 

10870.2 

11509.6 

12149.0 

2000      JJ12788.4 

13427.9  14067.3 

14706.7 

15346.1 

15985.5 

16625.0 

17264.4  17903.8 

18543.2 

3000       j  19182.7 

19822.1  20461.5  21100.9 

21740.3 

22379.8 

23019.2 

23653.6  2429S.O 

24937.5 

4000 

25576.9 

26216.3  26855.7  27495.1 

28134.6 

25774.0 

29413.4 

30052.8130692.3 

31331.7 

5000 

j  31971.1  32610.  5  33249.9  33889.4 

3-1528.8 

35168.2  J35S07.6 

36447.0  37086.5  37725.9 

D 


115 


TO   CONVERT 
METRES 

INTO  DIFFERENT  MEASURES   OF  LENGTH. 
1    LEGAL    METRE  =  443.296    FRENCH    OR   PARIS    LINES. 


V.     CONVERSION    OF    METRES    INTO    TOISES    AND    DECIMALS. 
1  Metre  -  0.513074074  Toise. 


Metres. 

Hundreds. 

Thousands. 

0. 

100. 

200. 

300. 

400. 

500.     600. 

700. 

§OO. 

9OO. 

Toises. 

Toises. 

Toises. 

Toises 

Toises 

Toises. 

Toises 

Toises. 

Toises. 

Toises. 

0 

0.00 

51.31 

102.61 

153.92 

205.23 

256.54 

307.84 

359.15 

410.46 

.  461.77 

1000 

513.07 

564.38 

615.69 

667.00 

718.30 

769.61 

820.92 

872.23 

923.53    974.84 

2000 

1026.15 

1077.46 

1128.76 

1180.07 

1231.38 

1282.69 

1333.99 

1385.30 

1436.61 

1487.91 

3000 

1539.22 

1590.53 

1641-84 

1693.14 

1744.45 

1795.76 

1847.07 

1898  37 

1949.68 

2000.99 

4000 

2052.30 

2103.60 

2154.91 

2206.22 

2257.53 

2308.83 

2360.14 

2411.45 

2462.76 

2514.06 

5000 

2565.37 

2616.68 

2667.98 

2719.29 

2770.60 

2821.91 

2873.21 

2924.52 

2975.83 

3027.14 

6000 

3078.44 

3129.75 

3181.06 

3232.37 

32S3.67 

3334.98 

3386.29 

3437.60 

3488.90  3540.21 

7000 

3591.52 

3642.83 

3694.13 

3745.44 

3796.75 

3848.06 

3899.36 

3950.67 

4001.98  4053.28 

8000 

4104.59 

4155.90 

4207.21 

4258.51 

4309.82 

4361.13  4412.44 

4463.74 

4515.05  4566.36 

9000 

461  7.67  1  4668.97 

4720.28 

4771.59 

4822.90 

4874.20  4925.51 

4976.82 

5028.13  5079.43 

Units. 

Metres. 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Toises. 
0.000 

Toises. 
0.513 

Toises. 
1.026 

Toises. 
1.539 

Toises. 
2.052 

Toises. 
2.565 

Toises. 
3.078 

Toises. 
3.592 

Toises. 
4.105 

Toises. 
4.618 

10 

5.131 

*  5.644 

6.157 

6.670 

7-183 

7.696 

8.209 

8.722 

9.235 

9.748 

20 

10.261 

10.775 

11.288 

11.801 

12.314 

12.827 

13.340 

13.853 

14.366 

14.879 

30 

15.392 

15.905 

16.418 

16.931 

17.445 

17.958 

18.471 

18.984 

19.497 

20.010 

40 

20.523 

21.036 

21.549 

22.062 

22.575 

23.088 

23.601 

24.114 

24.628 

25.141 

50 

25.654 

26.167 

26.680 

27.193 

27.706 

28.219 

28.732 

29.245 

29.758 

30.271 

60 

30.784 

31.298 

31.811 

32.324 

32.837 

33.350 

33.863 

34.376 

34.889 

35.402 

70 

35.915 

36.428 

36.941 

37.454 

37.967 

38.481 

38.994 

39.507 

40.020 

40.533 

80 

41.046 

41.559 

42.072 

42.585 

43.098 

43.611 

44.124 

44.637 

45.151 

45.664 

90 

46.177 

46.690 

47.203 

47.716 

48.229 

48.742 

49.255 

49.768 

50.281 

50.794 

D 


116 


VI.     CONVERSION    OF    METRES    INTO    PARIS    OR    FRENCH    FEET    AND    DECIMALS. 

1  Metre  =  3.078444.  Paris  Feet. 


Metres. 

Metres.  Units. 

Tens. 

0. 

1. 

2.    3. 

4. 

5. 

6. 

?. 

8. 

9. 

Fr.  Feet,  i  Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet.  Fr.  Feet. 

Fr.  Feet. 

0 

0.00    3.  OS 

6.16 

9.24 

12.31 

15.39 

18.47 

21.55 

24.63 

27.71 

10 

30.78 

33.86 

36.94 

40.02 

43.10 

46.18 

49.26 

52.33 

55.41 

58.49 

•  20 

61,57 

64.65 

67.73 

70.80 

73.88 

76.96 

80.04 

83.12 

86.20 

89.27 

30 

92.35   95.43 

98.51 

101.59 

104.67 

107.75 

110.82 

113.90 

116.98 

120.06 

40 

123.14 

126.22 

129.29 

132.37 

135.45 

138.53 

141.61 

144.69 

147.77 

150.84 

50 

153.92 

157.00 

160.08 

163.16 

166.24 

169.31 

172.39 

175.47 

178.55 

181.63 

60 

184.71 

187.79 

190.86 

193.94 

197.02 

200.10 

203.18 

206.26 

209.33 

212.41 

70 

215.49 

218.57 

221.65 

224.73 

227.80 

230.88 

233.96 

237.04 

240.12 

243.20 

80 

246.28 

249.35 

252.43 

255.51 

258.59 

261.67 

264.75 

267.82 

270.90 

273.98 

90 

277.06 

280.14 

283.22 

286.30 

289.37 

292.45 

295.53 

298.61 

301.69 

304.77 

•  100 

307.84 

310.92 

314.00 

317.08 

320.16 

323.24 

326.32 

329.39 

332.47 

335.55 

110 

338-63 

341.71 

344.79 

347.86 

350.94 

354.02 

357.10 

360.18 

363.26 

366.33 

120 

369.41 

372.49 

375.57 

378.65 

381.73 

384.81 

387.88 

390.96 

394.04 

397.12 

130 

400.20 

403.28 

406.35 

409.43 

412.51 

415.59 

418.67 

421.75 

424.83 

427.90 

140 

430.98 

434.06 

437.14 

440.22 

443.30 

446.37 

449.45 

452.53 

455.61 

458.69 

150 

461.77 

464.85 

467.92 

471.00 

474.08 

477.16 

480.24 

483.32 

486.39 

489.47 

160 

492.55 

495.63 

498.71 

501.79 

504.86 

507.94 

511.02 

514.10 

517.18 

520.26 

170 

523.34 

526.41 

529.49 

532.57 

535.65 

538.73 

541.81 

544.88 

547.96 

551.04 

180 

554.12 

557.20 

560.28 

563.36 

566.43 

569.51 

572.59 

575.67 

578.75 

581.83 

190 

584.90 

587.98 

591.06 

594.14 

597.22 

600.30 

603.38 

606.45 

609.53 

612.61 

200 

615.69 

618.77 

621.85 

624.92 

628.00 

631.08 

634.16 

637.24 

640.32 

643.39 

210 

646.47 

649.55 

652.63 

655.71 

658.79 

661.87 

664.94 

668.02 

671.10 

674.18 

220 

677.26 

680.34 

683.41 

686.49 

689.57 

692.65 

695.73 

698.81 

701.89 

704.96 

230 

708.04 

711.12 

714.20 

717.28 

720.36 

723.43 

726.51 

729.59 

732.67 

735.75 

240 

738.83 

741.90 

744.98 

748.06 

751.14 

754.22 

757.30 

760.38 

763.45 

766.53 

250 

769.61 

772.69 

775.77 

778.85 

781.92 

785.00 

788.08 

791.16 

794.24 

797.32 

260 

800.40 

803.47 

806.55 

809.63 

812.71 

815.79 

818.87 

821.94 

825.02 

828.10 

270 

831.18 

834.26 

837.34 

840.42 

843.49 

846.57 

849.65 

852.73 

855.81 

858.89 

2SO 

861.96 

865.04 

868.12 

871.20 

874.28 

877.36 

880.43 

883.51 

886.59 

889.67 

290 

892.75 

895.83 

898.91 

901.98 

905.06 

908.14 

911.22 

914.30 

917.38 

920.45 

300 

923.53 

926.61 

929.69 

932.77 

935.85 

938.93 

942.00 

945.08 

948.16 

951.24 

310 

954.32 

957.40 

960.47 

963.55 

966.63 

969.71 

972.79;  975.87 

978.95 

982.02 

320 

985.10 

988.18 

991.26 

994.34 

997.42 

1000.49 

1003.57|  1006.65 

1009.73 

1012.81 

330 

1015.89 

1018.96 

1022.04 

1025.12 

1028.20 

1031.28 

1034.36  1037.44 

1040.51 

1043.59 

340 

1046.67 

1049.75 

1052.83 

1055.91 

1058.98 

1062.06 

1065.14 

1068.22 

1071.30 

1074.38 

350 

1077.46 

1080.53 

1083.61 

1086.69 

1089.77 

1092.85 

1095.93 

1099.00 

1102.08 

1105.16 

360 

1108.24 

1111.32 

1114.40 

1117.48 

1120.55 

1123.63 

1126.71  1129.79 

1132.87 

1135-.95 

370 

1139.02 

1142.10 

1145.18 

1148.26  1151.34 

1154.42  1157.49  1160.57 

1163.65 

1166.73 

380 

1169.81 

1172.89 

1175.97 

1179.04  1182.12 

1185.20  1188.28  1191.36 

1194.44 

1197.51 

390 

1200.59 

1203.67 

1206.75 

1209.83 

1212.91 

1215.99  1219.06  1222.14 

1225.22 

1228.30 

O. 

1. 

2. 

3. 

4. 

5. 

6.   y. 

8. 

9. 

D 


117 


CONVERSION    OF    METRES    INTO    PARIS    OR    FRENCH    FEET    AND    DECIMALS. 


1  Metre  =  3.078444  Paris  Feet. 


r   — 



Metres.  Units   . 

Metres. 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7.    8. 

9. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet.  Fr  Feet. 

Fr.  Feet. 

400 

1231.38 

1234.46 

1237.53 

1240.61 

1243.69 

1246.77 

1249.85 

1252.93  1256.01 

1259.Q8 

410 

1262.16 

1265.24 

1268.32 

1271.40 

1274.48 

1277.55 

1280.63 

1283.71  1286.79 

1289.87 

420 

1292.95 

1296.02 

1299.10 

1302.18 

1305.26 

1308.34 

1311.42 

1314.50  1317.57 

1320.65 

430 

1320.73 

1326.81 

J  329.89 

1332.97 

1336.04 

1339.12 

1342.20 

1345.28  1348.36 

1351.44 

440 

1354.52 

1357.59 

1360.67 

1363.75 

1366.83 

1369.91 

1372.99 

1376.06 

1379.14 

1382.22 

450 

1885.30 

1388.38 

1391.46 

1394.54 

1397.61 

1400.69 

1403.77 

1406.85 

1409.93 

1413.01 

460 

1416.08 

1419.16 

1422.24 

1425.32 

1428.40 

1431.48 

1434.55 

1437.63  1440.71 

1443.79 

470 

1446.87 

1449.95 

1453.03 

1456.10 

1459.18 

1462.26 

1465.34 

1468.42  1471.50 

H74.57 

480 

1477.65 

1480.73 

1483.81 

1486.89 

1489.97 

1493.05 

1496.12 

1499.20  1502.28 

1  505.36 

490 

1508.44 

1511.52 

1514.59 

1517.67 

1520.75 

1523.83 

1526.91 

1529.99 

1533.07 

1536.14! 

500 

1539.22 

1542.30 

1545.38 

1548.46 

1551.54 

1554.61 

1557.69 

1560.77 

1563.85 

1566.93  | 

510 

1570.01 

1573.08 

1576.16 

1579.24 

1582.32 

1585.40 

1588.48 

1591.56 

1594.63 

1597.71 

520 

1600.79 

1603.87 

1606.95 

1610.03 

1613.10 

1616.18 

1619.26 

1622.34 

1625.42 

1628.50 

530 

1631.58 

1634.65 

1637.73 

1640.81 

1643.89 

1646.97 

1650.05 

1653.12 

1656.20 

1659.28 

540 

1662.36 

1665.44 

1668.52 

1671.60 

1674.67 

1677.75 

1680.83 

1683.91 

1686.99 

1690.07 

550 

1693.14 

1696.22 

1699.30 

1702.38 

1705.46 

1708.54 

1711.61 

1714.69 

1717.77 

1720.85 

560 

1723.93 

1727.01 

1730.09 

1733.16 

1736.24 

1739.32 

1742.40 

1745.48 

1748.56 

1751.63 

570 

1754.71 

1757.79 

1760.87 

1763.95 

1767.03 

1770.11 

1773.18 

1776.26 

1779.34 

1782.42 

580 

1785.50 

1788.58 

1791.65 

1794.73 

1797.81 

1800.89 

1803.97 

1807.05 

1810.13 

1813.20 

590 

1816.28 

1819.36 

1822.44 

1825.52 

1828.60 

1831.67 

1834.75 

1837.83 

1840.91 

1843.99 

600 

1847.07 

1850.14 

1853.22 

1856.30 

1859.38 

1862.46 

1865.54 

1868.62 

1871.69 

1874.77 

610 

1877.85 

1880.93 

1884.01 

1887.09 

1890.16 

1893.24 

1896.32 

1899.40  1902.48 

1905.56 

620 

1908.64 

1911.71 

1914.79 

1917.87 

1920.95 

1924.03  1927.11 

1930.18  1933.26 

1936.34 

630 

1939.42 

1942.50 

1945.58 

1948.66 

1951.73 

1954.81  1957.89 

1960.97  1964.05 

1967.13 

640 

1970.20 

1973.28 

1976.36 

1979.44 

1932.52 

1985.60 

1988.67 

1991.75 

1994.83 

1997.91 

650 

'2000.99 

2004.07 

2007.15 

2010.22 

2013.30 

2016.38 

2019.46 

2022.54 

2025.62 

2028.69 

660 

2031.77 

2034.85 

2037.93 

2041.01 

2044.09 

2047.17  2050.24 

2053.32  2056.40 

2059.48 

670 

2062.56 

2065.64 

2068.71 

2071.79 

2074.87 

2077.95  2081.03 

2084.11  2087.19 

2090.26 

680 

2093.34 

2096.42 

2099.50 

2102.58 

2105.66 

2108.73  2111.81 

2114.89  2117.97 

2121.05 

690 

2124.13 

2127.20 

2130.28 

2133.36 

2136.44 

2139.52 

2142.60 

2145.68 

2148.75 

2151.83 

700 

2154.91 

2157.99 

2161.07 

2164.15 

2167.22 

2170.30 

2173.38 

2176.46 

2179.54 

2182.62 

710 

2185.70 

2188.77 

2191.85 

2194.93 

2198.01 

2201.09  2204.17  2207.24 

2210.32 

2213.40 

720 

2216.48 

2219.56 

2222.64 

2225.72 

2228.79 

2231.87 

2234.95  2238.03 

2241.11 

2244.19 

730 

2247.26 

2250.34 

2253.42 

2256.50 

2259.58 

2262.66 

2265.73  2268.81 

2271.89 

2274.97 

740 

2278.05 

2281.13 

2284.21 

2287.28 

2290.36 

2293.44 

2296.52 

2299.60 

2302.68 

2305.75 

750 

2308.83 

2311.91 

2314.99 

2318.07 

2321.15 

2324.23 

2327.30 

2330.38 

2333.46 

2336.54 

760 

2339.62 

2342.70 

2345.77 

2348.85 

2351.93 

2355.01  2358.09  2361.17 

2364.24 

2367.32 

770 

2370.40 

2373.48 

2376.56 

2379.64 

2382.72 

2385.79  2388.87  2391.95 

2395.03 

2398.11 

780 

2401.19 

2404.26 

2407.34 

2410.42 

2413.50 

2416.58  2419.66  2422.74 

2425.81 

2428.89 

790 

2431.97 

2435.05 

2438.13 

2441.21 

2444.28 

2447.36  2450.44  2453.52 

2456.60 

2459.68 

i 

0. 

1. 

2. 

3. 

4. 

5% 

6.    7. 

8. 

0. 

n 


118 


CONVERSION    OF    METRES    INTO    PARIS    OR    FRENCH    FEET    AND    DECIMALS. 
1  Metre  ==  3.078444  Paris  Feet. 


Metres.  Units. 

Metres. 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

Fr.  Feet. 

800 

246:?.  76 

2465.83 

2468.91 

2471.99 

2475.07 

2478.15 

2481.23 

2484.30 

2487.38 

2490.46 

810 

2493.54 

2496.62 

2499.70 

2502.77 

2505.85 

2508.93 

2512.01 

2515.09 

2518.17 

2521.25 

820 

2524.32 

2527.40 

2530.48 

2533.56 

2536.64 

2539.72 

2542.79 

2545.87 

2548.95 

2552.03 

830 

2555.1  1 

2558.19 

2561.27 

2564.34 

2567.42 

2570.50 

2573.58 

2576.66 

2579.74 

2582.81 

840 

2585.89 

2588.97 

2592.05 

2595.13 

2598.21 

2601.29 

2604.36 

2607.44 

2610.52 

2613.60 

850 

2616.68 

2619.76 

2622.83 

2625.91 

2628.99 

2632.07 

2635.15 

2638.23 

2641.30 

2644.38 

860 

2647.46 

2650.54 

2653.62 

2656.70 

2659.78 

2662.85 

2665.93 

2669.01 

2672.09 

2675.17 

870 

2678.25 

2681.32 

2684.40 

2687.48 

2690.56 

2693.64 

2696.72 

2699.80 

2702.87 

2705.95 

880 

2709.03 

2712.11 

2715.19 

2718.27 

2721.34 

2724.42 

2727.50 

2730.58 

2733.66 

2736.74 

'890 

2739.82 

2742.89 

2745.97 

2749.05 

2752.13 

2755.21 

2758.29 

2761.36 

2764.44 

2767.52 

900 

2770.60 

2773.68 

2776.76 

2779.83 

2782.91 

2785.99 

2789.07 

2792.15 

2795.23 

2798.31 

910 

2801.38 

2804.46 

2807.54 

2810.62 

2813.70 

2816.78 

2819.85 

2822.93 

2826.01 

2829.09 

920 

2832.17 

2835.75 

2838.33 

2841.40 

2844.48 

2847.56 

2850.64 

2853.72 

2856.80  2859.87 

930 

2862.95 

2866.03 

2869.11 

2872.19 

2875.27 

2878.35 

2881.42 

2884.50 

2887.58 

2890.66 

940 

2893.74 

2896.82 

2899.89 

2902.97 

2906.05 

2909.13 

2912.21 

2915.29 

2918.36 

2921.44 

950 

2924.52 

2927.60 

2930.68 

2933.76 

2936.84 

2939.91 

2942.99 

2946.07 

2949.15 

2952.23 

960 

2955.31 

2958.38 

2961.46 

2964.54 

2967.62 

2970.70 

2973.78 

2976.86 

2979.93 

2983.01 

970 

2986.09 

2989.17 

2992.25 

2995.33 

2998.40 

3001.48 

3004.56 

3007.64 

3010.72 

3013.80 

980 

3016.88 

3019.95 

3023.03 

302.6.11 

3029.19 

3032.27 

3035.35 

3038.42 

3041.50 

3044.58 

990 

3047.66  1  3050.74 

3053.82 

3056.89 

3059.97 

3063.05 

3066.13 

3069.21 

3072.29  3075.37 

Metres. 

French  Feet    Metres.   French  Feet    Metres.    French  Feet. 

Metres.    French  Feet. 

1000 

3078.44    5000    15392.22     9000    27706.00 

13000    40019.78 

2000 

6156.89    6000    18470.67    10000    30784.44 

14000    43098.22 

3000 

9235.33    7000    21549.11    11000    33862.89 

15000    46176.67 

4000 

12313.78    8000    24627.56    12000    36941.33 

16000    49255.11 

Decimetres. 

Metres. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

0. 

Fr  Feet 

Fr  Feet. 

Fr.Feet. 

Fr.Feet. 

Fr  Feet. 

Fr  Feet 

Fr.Feet. 

Fr.Feet. 

Fr.Feet. 

Fr  Feet. 

0 

0.0000 

0.3078 

0.6157 

0.9235 

1.2314 

1.5392 

1.8471 

2.1549 

2.4628 

2.7706 

1 

3.0784 

3.3863 

3.6941 

4.0020 

4.3098 

4.6177 

4.9255 

5.2334 

5.5412 

5.8490 

2 

6.1569 

6.4647 

6.7726 

7.0804 

7.3883 

7.6961 

8.0040 

8.3118 

8.6196 

8.9275 

3 

9.2353 

9.5432 

9.8510 

10.1589 

10.4667 

10.7746 

11.0824 

11.3902 

11.6981 

12.0059 

4 

12.3133 

12.6216 

12.9295 

13.2373 

13.5452 

13.8530 

14.1608 

14.4687 

14.7765 

15.0844 

5 

15.3922 

15.7001 

16.0079 

16.3158 

16.6236 

16.9314 

17.2393 

17.5471 

17.8550 

18.1628 

6 

18.4707 

18.7785 

19.0864 

19.3942 

19.7020 

20.0099 

20.3177 

20.6256 

20.9334 

21.2413 

7 

21.5491 

21.8570 

22.1648 

22.4726 

22.7805 

23.0883 

23.3962 

23.7040 

24.0119 

24.3197 

S 

24.6276  24.9354 

25.2432 

25.5511 

25.8589 

26.1668 

26.4746 

26.7825 

27.0903 

27.3982 

9 

27.7060J28.0138 

28.3217 

28.6295 

28.9374 

29.2452 

29.5531 

29.8609 

30.1688 

30.4766 

D 


119 


VII.    CONVERSION    OF    METRES    INTO    ENGLISH    FEET    AND    DECIMALS. 

1  Metre  =  3.28039917  Enslish  Feet. 


Metres.  (Units.) 

Metres. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

0 

0.0 

3.28 

6.56 

9.84 

13.12 

16.40 

19.69 

22.97 

26.25 

29.53 

10 

32.81 

36.09 

39.37 

42.65 

45.93 

49.21 

52.49 

55.78 

59.06 

62.34 

20 

65.62 

68.90 

72.18 

75.46 

78.74 

82.02 

85.30 

88.58 

91.87 

95.15 

30 

98.43 

101.71 

104.99 

108.27 

111.55 

114.83 

118.11 

121.39 

124.67 

127.96 

40 

131.24 

134.52 

137.80 

141.08 

144.36 

147.64 

150.92 

154.20 

157.48 

160.76 

50 

164.04 

167.33 

170.61 

173.89 

177.17 

180.45 

183.73 

187.01 

190.29 

193.57 

60 

196.85 

200.13 

203.42 

206.70 

209.98 

213.26 

216.54 

219.82 

223.10 

226.38 

70 

229.66 

232.94 

236.22 

239.51 

242.79 

246.07 

249.35 

252.63 

255.91 

259.19 

80 

262.47 

265.75 

269.03 

272.31 

275.60 

278.88 

282.16 

285.44 

288.72 

292.00 

90 

295.28 

298.56 

301.84 

305.12 

308.40 

311.69 

314.97 

318.25 

321.53 

324.81 

100 

328.09 

331.37 

334.65 

337.93 

341.21 

344.49 

347.78 

351.06 

354.34 

357.62 

110 

360.90 

364.18 

367.46 

370.74 

374.02 

377.30 

380.58 

383.87 

387.15 

390.43 

120 

393.71 

396.99 

400.27 

403.55 

406.83 

410.11 

413.39 

416.67 

419.96 

423.24 

130 

426.52 

429.80 

433.08 

436.36 

439.64 

442.92 

446.20 

449.48 

452.78 

456.04 

140 

459.33 

462.61 

465.89 

469.17 

472.45 

475.73 

479.01 

482.29 

485.57 

488.85 

150 

492.13 

495.42 

498.70 

501.98 

505.26 

508.54 

511.82 

515.10 

518.38 

521.66 

160 

524.94 

528.22 

531.51 

534.79 

538.07 

541.35 

544.63 

547.91 

551.19 

554.47 

170 

557.75 

561.03 

564.31 

567.60 

570.88 

574.16 

577.44 

580.72 

584.00 

587.23 

180 

590.56 

593.84 

597.12 

600.40 

603.69 

606.97 

610.25 

613.53 

616.81 

620.09 

190 

623.37 

626.65 

629.93 

633.21 

636.49 

639.78 

643.06 

646.34 

649.62 

652.90 

200 

656.18 

659.46 

662.74 

666.02 

669.30 

672.58 

675.87 

679.15 

682.43 

685.71 

210 

688.99 

692.27 

695.55 

698.83 

702.11 

705.39 

708.67 

711.96 

715.24 

718.52 

220 

721.80 

725.08 

728.36 

731.64 

734.92 

738.20 

741.48 

744.76 

748.05 

751.33 

230 

754.61 

757.89 

761.17 

764.45 

767.73 

771.01 

774.29 

777.57 

780.85 

784.13 

240 

787.42 

790.70 

793.98 

797.26 

800.54 

803.82 

807.10 

810.38 

813.66 

816.94 

250 

820.22 

823.51 

826.79 

830.07 

833.35 

836.63 

839.91 

843.19 

846.47 

849.75 

260 

853.03 

856.31 

859.60 

862.88 

866.16 

869.44 

872.72 

876.00 

879.28 

882.56 

270 

885.84 

889.12 

892.40 

895.69 

898.97 

902.25 

905.53 

908.81 

912.09 

915.37 

280 

918.65 

921.93 

925.21 

928.49 

931.78 

935.06 

938.34 

941.62 

944.90 

948.18 

290 

951.46 

954.74 

958.02 

961.30 

964.58 

967.87 

971.15 

974.43 

977.71 

980.99 

300 

984.27 

987.55 

990.83 

994.11 

997.39 

1000.67 

1003.96 

1007.24 

1010.52 

1013.80 

310 

1017.08 

1020.36 

1023.64 

1026.92 

1030.20 

1033.48 

1036.76 

1040.05 

1043.33 

1016.61 

320 

1049.89 

1053.17 

1056.45 

1059.73 

1063.01 

1066.29 

1069.57 

1072.85 

1076.13 

1079.42 

330' 

1082.70 

1085.98 

1089.26 

1092.54 

1095.82 

1099.10 

1102.38 

1105.66 

1108.94 

1112.22 

340 

1115.51 

1118.79 

1122.07 

1125.35 

1128.63 

1131.91 

1135.19 

1138.47 

1141.75 

1145.03 

350 

1148.31 

1151.60 

1154.88 

11&8.16 

1161.44 

1164.72 

1168.00 

1171.28 

1174.56 

1177.84 

360 

1181.12 

1184.40 

1187.69 

1190.97 

1194.25 

1  197.5  3 

1200.81 

1204.09 

1207.37 

1210.65 

370 

1213.93 

1217.21 

1220.49 

1223.78 

1227.06 

1230.34 

1233.62 

1236.90 

1240.18 

1243.46 

380 

1246.74 

1250.02 

1253.30 

1256.58 

1259.87 

1263.15 

1266.43 

1269.71 

1272.99 

1276.27 

390 

1279.55 

1282.83 

1286.11 

1289.39 

1292.67 

1295.96 

1299.24 

1302.52 

1305.80 

1309.08 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

CONVERSION    OF    METRES    INTO    ENGLISH    FEET   AND    DECIMALS. 


4OO  to   799. 


Metres.  (Units.) 

Metres. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Eag.Feet. 

Eag.Feet. 

Eag.Feet. 

Eag.Feet. 

Eag.Feet. 

Eag.Feet. 

Eng.Feet. 

Eag.Feet. 

Eng.Feet. 

Eng.Feet. 

400 

1312.36 

1315.64 

1318.92 

1322.20 

1325.48 

1328.76 

1332.05 

1335.33 

1338.61 

1341.89 

410 

1345.17 

1348.45 

1351.73 

1355.01 

1358.29 

1361.57 

1364.85 

1368.13 

1371.42 

1374.70 

420 

1377.98 

1381.26 

1384.54 

1387.82 

1391.10 

1394.38 

1897.66 

1400.94 

1404.22 

1407.51 

430 

1410.79. 

1414.07 

1417.35 

1420.63 

1423.91 

1427.19 

1430.47 

1433.75 

1437.03 

1440.31 

440 

1443.60 

1446.88 

1450.16 

1453.44 

1456.72 

1460.00 

1463.28 

1466.56 

1469.84 

1473.12 

450 

1476.40 

1479.69 

1482.97 

1486.25 

1489.53 

1492.81 

1496.09 

1499.37 

1502.65 

1505.93 

460 

1509  21 

1512.49 

1515.78 

1519.06 

1522.34 

1525.62 

1528.90 

1532.18 

1535.46 

1538.74 

470 

1542.02 

1545.30 

1548.58 

1551.87 

1555.15 

1558.43 

1561.71 

1564.99 

1568.27 

1571.55 

480 

1574.83 

1578.11 

1581.39 

1584.67 

1587.96 

1591.23 

1594.52 

1597.80 

1601.08 

1604.36 

490 

1607.64 

1610.92 

1614.20 

1617.48 

1620.76 

1624.05 

1627.33 

1630.61 

1633.89 

1637.17 

500 

1640.45 

1643.73 

1647.01 

1650.29 

1653.57 

1656.85 

1660.13 

1663.42 

1666.70 

1669.98 

510 

1673.26 

1676.54 

1679.82 

1683.10 

1686.38 

1689.66 

1692.94 

1696.22 

1699.51 

1702.79 

520 

1706.07 

1709.35 

1712.63 

1715.91 

1719.19 

1722.47 

1725.75 

1729.03 

1732.31 

1735.60 

530 

1738.88 

1742.16 

1745.44 

1748.72 

1752.00 

1755.28 

1758.56 

1761.84 

1765.12 

1768.40 

540 

1771.69 

1774.97 

1778.25 

1781.53 

1784.81 

1788.09 

1791.37 

1794.65 

1797.93 

1801.21 

550 

1804.49 

1807.78 

1811.06 

1814.34 

1817.62 

1820.90 

1824.18 

1827.46 

1830.74 

1834.02 

560 

1837.30 

1840.58 

1843.87 

1847.15 

1850.43 

1853.71 

1856.99 

1860.27 

1863.55 

1866.83 

570 

1870.11 

1873.39 

1876.67 

1879.96 

1883.24 

1886.52 

1889.80 

1893.08 

1896.36 

1899.64 

580 

1902.92 

1906.20 

1909.48 

1912.76 

1916.05 

1919.33 

1922.61 

1925.89 

1929.17 

1932.45 

590 

1935.73 

1939.01 

1942.29 

1945.57 

1948.85 

1952.13 

1955.42 

1958.70 

1961.98 

1965.26 

600 

1968.54 

1971.82 

1975.10 

1978.38 

1981.66 

1984.94 

1988.22 

1991.51 

1994.79 

1998.07 

610 

2001.35 

2004.63 

2007.91 

2011.19 

2014.47 

2017.75 

2021.03 

2024.31 

2027.60 

2030.88 

620 

2034.16 

2037.44 

2040-72 

2044.00 

2047.28 

2050.56 

2053.84 

2057.12 

2060.40 

2063.69 

630 

2066.97 

2070.25 

2073.53 

2076.81 

2080.09 

2083.37 

2086.65 

2089.93 

2093.21 

2096.49 

640 

2099.78 

2103.06 

2106.34 

2109.62 

2112.90 

2116.18 

2119.46 

2122.74 

2126.02 

2129.30 

650 

2132.58 

2135.87 

2139.15 

2142.43 

2145.71 

2148.99 

2152.27 

2155.55 

2158.83 

2162.11 

660 

2165.39 

2168.67 

2171.96 

2175.24 

2178.52 

2181.80 

2185.08 

2188.36 

2191.64 

2194.92 

670 

2198.20 

2201.48 

2204.76 

2208.05 

2211.33 

2214.61 

2217.89 

2221.17 

2224.45 

2227.73 

630 

2231.01 

2234.29 

2237.57 

2240.85 

2244.13 

2247.42 

2250.70 

2253.98 

2257.26 

2260.54 

690 

2263.82 

2267.10 

2270.38 

2273.66 

2276.94 

2280.22 

2283.51 

2286.79 

2290.07 

2293.35 

700 

2296.63 

2299.91 

2303.19 

2306.47 

2309.75 

2313.03 

2316.31 

2319.60 

2322.88 

2326.16 

710 

2329.44 

2332.72 

2336.00 

2339.28 

2342.56 

2345.84 

2349.12 

2352.40 

2355.69 

2358.97 

720 

2362.25 

2365.53 

2368.81 

2372.09 

2375.37 

2378.65 

2381.93 

2385.21 

2388.49 

2391.78 

730 

2395.06 

2398.34 

2401.62 

2404.90 

2408.18 

2411.46 

2414.74 

2418.02 

2421.30 

2424.58 

740 

2427.87 

2431.15 

2434.43 

2437.71 

2440.99 

2444.27 

2447.55 

2450.83 

2454.11 

2457.39 

750 

2460.67 

2463.96 

2467.24 

2470.52 

2473.80 

2477.08 

2480.36 

2483.64 

2486.92 

2490.20 

760 

2493.48 

2496.76 

2500.05 

2503.33 

2506.61 

2500.89 

2513.17 

2516.45 

2519.73 

2523.01 

770 

2526.29 

2529.57 

2532.85 

2536.14 

2539.42 

2542.70 

2545.98 

2549.26 

2552.54 

2555.82 

780 

2559.10 

2562.38 

2565.66 

2568.94 

2572.22 

2575.51 

2578.79 

2582.07 

2585.35 

2588.63 

790 

2591.91 

2595.19 

2598.47 

2601.75 

2605.03 

2608.31 

2611.60 

2J314.88 

2618.16 

2621.44 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

D 


121 


CONVERSION    OF    METRES    INTO    ENGLISH    FEET    AND    DECIMALS. 

SOO  to   1199. 


Metros. 

Metres.  (Units.) 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

•7. 

'  8. 

9. 

i 
800 

Eng.Feet. 
2624.72 

Eng.Feet. 
2628.00 

Eng.Feet. 
2631.28 

Eng.Feet. 
2634.56 

Eng.Feet 
2637.84 

Eng.Feet 
2641.12 

Eng.Feet 
2644.40 

Eng.Feet 
2647.69 

Eng.Feet. 
2650.97 

Eng.Feet. 
2654.25 

810 

2657.53 

2660.81 

2664.09 

2667.37 

2670.65 

2673.93 

2677.21 

2680.49 

2683.78 

2687.06 

820 

2690.34 

2693.62 

2696.90 

2700.18 

2703.46 

2706.74 

2710.02 

2713.30 

2716.58 

2719.87 

830 

2723.15 

2726.43 

2729.71 

2732.99 

2736.27 

2739.55 

2742.83 

2746.11 

2749.39 

2752.67 

840 

2755.96 

2759.24 

2762.52 

2765.80 

2769.08 

2772.36 

2775.64 

2778.92 

2782.20 

2785.48 

850 

2788.76 

2792.05 

2795.33 

2798.61 

2801.89 

2805.17 

2808.45 

2811.73 

2815.01 

2818.29 

860 

2821.57 

2824.85 

2828.14 

2831.42 

2834.70 

2837.98 

2841.26 

2844.54 

2847.82 

2851.10 

870 

2854.38 

2857.66 

2860.94 

2864.22 

2867.51 

2870.79 

2874.07 

2877.55 

2880.63 

2883-91 

880 

2887.19 

2890.47 

2893.75 

2897.03 

2900.31 

2903-60 

2906.88 

2910.16 

2913.44 

2916.72 

890 

2920.00 

2923.28 

2926.56 

2929.84 

2933.12 

2936.40 

2939.69 

2942.97 

2946.25 

2949.53 

900 

2952.81 

2956.09 

2959.37 

2962.65 

2965.93 

2969.21 

2972.49 

2975.78 

2979.06 

2982.34 

910 

2985.62 

2988.90 

2992.18 

2995.46 

2998.74 

3002.02 

3005.30 

3008.58 

3011.87 

3015.15 

920 

3018.43 

3021.71 

3024.99 

3028.27 

3031.55 

3034.83 

3038.11 

3041.39 

3044.67 

3047.96 

930 

3051.24 

3054.52 

3057.80 

3061.08 

3064.36 

3069.64 

3070.92 

3074.20 

3077.43 

3080.76 

940 

3084.05 

3087.33 

3090.61 

3093.89 

3097.17 

3100.45 

3103.73 

3107.01 

3110.29 

3113.57 

950 

3116.85 

3120.14 

3123.42 

3126.70 

3129.98 

3133.26 

3136.54 

3139.82 

3143.10 

3146.38 

960 

3149.66 

3152.94 

3156.22 

3159.51 

3162.79 

3166.07 

3169.35 

3172.63 

3175.91 

3179.19 

970 

3182.47 

3185.75 

3189.03 

3192.31 

3195.60 

3198.88 

3202.16 

3205.44 

3208.72 

3212.00 

980 

3215.28 

3218.56 

3221.84 

3225.12 

3228.40 

3231.69 

3234.97 

3238.25 

3241.53 

3244.81 

990 

3248.09 

3251.37 

3254.65 

3257.93 

3261.21 

3264.49 

3267.78 

3271.06 

3274.34 

3277.62 

1000 

3280.90 

3284.18 

3287.46 

3290.74 

3291.02 

3297.30 

3300.58 

3303.87 

3307.15 

3310.43 

1010 

3313.71 

3316.99 

3320.27 

3323.55 

3326.83 

3330.11 

3333.39 

3336.67 

3339.96 

3343.24 

1020 

3346.52 

3349.80 

3353.08 

3356.36 

3359.64 

3362.92 

3366.20 

3369-48 

3372.76 

3376.05 

1030 

3379.33 

3382.61 

3385.89 

3389.17 

3392.45 

3395.73 

3399.01 

3402.29 

3405.57 

3408.85 

1040 

3412.14 

3415.42 

3418.70 

3421.98 

3425.26 

3428.54 

3431.82 

3435.10 

3438.38 

3441.66 

1050 

3444.94 

3448.22 

3451.51 

3454.79 

3458.07 

3461.35 

3464.63 

3467.91 

3471.19 

3474.47 

1060 

3477.75 

3481.03 

3484.31 

3487.60 

3490.88 

3494.16 

3497.44 

3500.72 

3504.00 

3507.28 

1070 

3510.56 

3513.84 

3517.12 

3520.40 

3523.69 

3526.97 

3530.25 

3533.53 

3536.81 

3540.09 

1080 

3543.37 

3546.65 

3549.93 

3553.21 

3556.49 

3559.78 

3563.06 

3566.34 

3569.62 

3572.90 

1090 

3576.18 

3579.46 

3582.74 

3586.02 

3589.30 

3592.58 

3595.87 

3599.15 

3602.43 

3605.71 

j  1100 

3608.99 

3612.27 

3615.55 

3618.8.3 

3622.11 

3625.39 

3628.67 

3631.96 

3635.24 

3638.52 

1110 

3641.80 

3645.08 

3648.36 

3651.64 

3654.92 

3658.20 

3661.48 

3664.76 

3668.05 

3671.33 

1120 

3671.61 

3677.89 

3681.17 

3684.45 

3687.73 

3691.01 

3694.29 

3697.57 

3700.85 

3704.14 

1130 

3707.42 

3710.70 

3713.98 

3717.26 

3720.54 

3723.82 

3727.10 

3730.38 

3733.66 

3736.94 

1140 

3740.22 

3743.51 

3746.79 

3750.07 

3753.35 

3756.63 

3759.91 

3763.19 

3766.47 

3769.75 

1150 

3773.03 

3776.31 

3779.60 

3782.88 

3786.16 

3789.44 

3792.72 

3796.00 

3799.28 

3802.56 

1160 

3805.84 

3809.12 

3812.40 

3815.69 

3818.97 

3822.25 

3825.53 

3828.81 

3832.09 

3835.37 

1170 

3838.65 

3841.93 

3845.21 

3848.49 

3851.78 

3855.06 

3858.34 

3861.62 

3864.90 

3868.18 

1180 

3871.46 

3874.74 

3878.02 

3881.30 

3884.58 

3887.87 

3891.15 

3894.43 

3897.71 

3900.99 

1190 

3904.27 

3907.55 

3910.83 

3914.11 

3917.39 

3920.67 

3923.96 

3927.24 

3930.52 

3933.80 

O. 

1.     2. 

3. 

4. 

5. 

6. 

7. 

s. 

9. 

D 


122 


CONVERSION    OF    METRES    INTO    ENGLISH    FEET   AND   DECIMALS. 


1200  to  1599. 


II 

Metres.  (Units.) 

Metres. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet 

Eng.Feet. 

1200 

3937.08 

3940.36 

3943.64 

3946.92 

3950.20 

3953.48 

3956.76 

3960.05 

3963.33 

3966.61 

1210 

3969.89 

3973.17 

3976.45 

3979.73 

3983.01 

3986.29 

3989.57 

3992.85 

3996.14 

3999.42 

1220 

4002.70 

4005.98 

4009.26 

4012.54 

4015.82 

4019.10 

4022.38 

4025.66 

4028.94 

4032.23 

1230 

4035.51 

4038.79 

4042.07 

4045.35 

4048.63 

4051.91 

4055.19 

4058.47 

4061.75 

4065.03 

1240 

4068.31 

4071.60 

4074.88 

4078.16 

4081.44 

4084.72 

4088.00 

4091.28 

4094.56 

4097.84 

1250 

4101.12 

4104.40 

4107.69 

4110.97 

4114.25 

4117.53 

4120.81 

4124.09 

4127.37 

4130.65 

1260 

4133.93 

4137.21 

4140.49 

4143.78 

4147.06 

4150.34 

4153.62 

4156.90 

4160.18 

4163.46 

1270 

4166.74 

4170.02 

4173.30 

4176.58 

4179.87 

4183.15 

4186.43 

4189.71 

4192.99 

4196.27 

1280 

4199.55 

4202.83 

4206.11 

4209.39 

4212.67 

4215.96 

4219.24 

4222.52 

4225.80 

4229.08 

1290 

4232.36 

4235.64 

4238.92 

4242.20 

4245.48 

4248.76 

4252.05 

4255.33 

4258.61 

4261.89 

1300 

4265.17 

4266.45 

4271.73 

4275.01 

4278.29 

4281.57 

4284.85 

4288.14 

4291.42 

4294.70 

1310 

4297.98 

4301.26 

4304.54 

4307.82 

4311.10 

4314.38 

4317.66 

4320.94 

4324.23 

4327.51 

1320 

4330.79 

4334.07 

4337.35 

4340.63 

4343.91 

4347.19 

4350.47 

4353.75 

4357.03 

4360.31 

1330 

4363.60 

4366.88 

4370.16 

4373.44 

4376.72 

4380.00 

4383.28 

4386.56 

4389.84 

4393.12 

1340 

4396.40 

4399.69 

4402.97 

4406.25 

4409.53 

4412.81 

4416.09 

4419.37 

4422.65 

4425.93 

1350 

4429.21 

4432.49 

4435.78 

4439.06 

4442.34 

4445.62 

4448.90 

4452.18 

4455.46 

1458.74 

1360 

4462.02 

4465.30 

4468.58 

4471.87 

4475.15 

4478.43 

4481.71 

4484.99 

4488.27 

4491.55 

1370 

4494.83 

4498.11 

4501.39 

4504.67 

4507.96 

*511.24 

4514.52 

4517.80 

4521.08 

4524.36 

1380 

4527.64 

4530.92 

4534.20 

4537.48 

4540.76 

4544.05 

4547.33 

4550.61 

4553.89 

4557.17 

1390 

4560.45 

4563.73 

4567.01 

4570.29 

4573.57 

4576.85 

4580.14 

4583.42 

4586.70 

4589.98 

1400 

4593.26 

4596.54 

4599.82 

4603.10 

4606.38 

4609.66 

4612.94 

4616.23 

4619.51 

4622.79 

1410 

4626.07 

4629.35 

4632.63 

4635.91 

4639.19 

4642.47 

4645.75 

4649.03 

4652.31 

4655.60 

1420 

4658.88 

4662.16 

4665.44 

4668.72 

4672.00 

4675.28 

4678.56 

4681.84 

4685.12 

4688.40 

1430 

4691.69 

4694.97 

4698.25 

4701.53 

4704.81 

4708.09 

4711.37 

4714.65 

4717.93 

4721.21 

1440 

4724.49 

4727.78 

4731.06 

4734.34 

4737.62 

4740.90 

4744.18 

4747.46 

4750.74 

4754.02 

1450 

4757.30 

4760.58 

4763.87 

4767.15 

4770.43 

4773.71 

4776.99 

4780.27 

4783.55 

4786.83 

1460 

4790.11 

4793.39 

4796.67 

4799.96 

4803.24 

4806.52 

4809.80 

4813.08 

4816.36 

4819.64 

1470 

4822.92 

4826.20 

4829.48 

4832.76 

4836.05 

4839.33 

4842.61 

4845.89 

4849.17 

4852.45 

1480 

4855.73 

4859.01 

4862.29 

4865.57 

4868.85 

4872.14 

4875.42 

4878.  JO 

4881.98 

4885.26 

1490 

4888.54 

4891.82 

4895.10 

4898.38 

4901.66 

4904.94 

4908.23 

4911.51 

4914.79 

4918.07 

1500 

4921.35 

4924.63 

4927.91 

4931.19 

4934.47 

4937.75 

4941.03 

4944.31 

4947.60 

4950.88 

1510 

4954.16 

4957.44 

4960.72 

4964.00 

4967.28 

4970.56 

4973.84 

4977.12 

4980.40 

4983.69 

1520 

4986.97 

4990.25 

4993.53 

4996.81 

5000.09 

5003.37 

5006.65 

5009.93 

5013.21 

5016.49 

1530 

5019.78 

5023.06 

5026.34 

5029.62 

5032.90 

5036.18 

5039.46 

5042.74 

5046.02 

5049.30 

1540 

5052.58 

5055.87 

5059.15 

5062.43 

5065.71 

5068.99 

5072.27 

5075.55 

5078.83 

5082.11 

1550 

5085.39 

5088.67 

5091.96 

5095.24 

5098.52 

5101.80 

5105.08 

5108.36 

5111.64 

5114.92 

1560 

5118.20 

5121.48 

5124.76 

5128.05 

5131.33 

5134.61 

5137.89 

5141.17 

5144.45 

5147.73 

1570 

5151.01 

5154.29 

5157.57 

5160.85 

5164.14 

5167.42 

5170.70 

5173.98 

5177.26 

5180.54 

1580 

5183.82 

5187.10 

5190.38 

5193.66 

5196.94 

5200.23 

5203.51 

5206.79 

5210.07 

5213.35 

1590 

5216.63 

5219.91 

5223.19 

5226.47 

5229.75 

5233.03 

5236.32 

5239.60 

5242.88 

5246.16 

O. 

1. 

2. 

ft. 

4. 

5. 

6. 

7. 

§. 

9. 

D 


123 


CONVERSION    OF    METRES    INTO    ENGLISH   FEET   AND    DECIMALS. 

1600  to  2000. 


Metres. 

Metres.  (Units.) 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Eng.Feet. 
5278.97 

1600 

Eng.Feet 
5249.44 

Eng.Feet 
5252.72 

Eng.Feet 
5256.00 

Eng.Feet 
5259.28 

Eng.Feet 
5262.56 

Eng.Feet 
5265.84 

Eng.Feet. 
5269.12 

Eng.Feet 
5272.40 

Eng.Feet 
5275.69 

1610 

5282.25 

5285.53 

5288.81 

5292.09 

5295.37 

5298.65 

5301.93 

5305.21 

5308.49 

5311.78 

1620 

5315.06 

5318.34 

5321.62 

5324.90 

5328.18 

5331.46 

5334.74 

5338.02 

5341.30 

5344.58 

1630 

5347.87 

5351.15 

5354.43 

5357.71 

5360.99 

5364.27 

5367.55 

5370.85 

5374.11 

5377.39 

1640 

5380.67 

5383.96 

5387.24 

5390.52 

5393.80 

5397.08 

5400.36 

5403.64 

5406.92 

5410.20 

1650 

5413.48 

5416.76 

5420.05 

5423.33 

5426.61 

5429.89 

5433.17 

5436.45 

5439.73 

5443.01 

1660 

5446.29 

5449.57 

5452.85 

5456.14 

5459.42 

5462.70 

5465.98 

5469.26 

5472.54 

5475.82 

1670 

5479.10 

5482.38 

5485.66 

5488.94 

5492.23 

5495.51 

5498.79 

5502.07 

5505.35 

5508.63 

1680 

5511.91 

5515.19 

5518.47 

5521.75 

5525.03 

5528.32 

5531.60 

5534.88 

5538.16 

5541.44 

1690 

5544.72 

5548.00 

5551.28 

5554.56 

5557.84 

5561.12 

5564.40 

5567.69 

5570.97 

5574.25 

1700 

5577.53 

5580.81 

5584.09 

5587.37 

5590.65 

5593.93 

5597.21 

5600.49 

5603.78 

5607.06 

1710 

5610.34 

5613.62 

5616.90 

5620.18 

5623.46 

5626.74 

5630.02 

5633.30 

5636.58 

5639.87 

1720 

5643.15 

5646.43 

5649.71 

5652.99 

5656.27 

5659.55 

5662.83 

5666.11 

5669.39 

5672.67 

1730 

5675.96 

5679.24 

5682.52 

5685.80 

5689.08 

5692.36 

5695.64 

5698.92 

5702.20 

5705.48 

1740 

5708.76 

5712.05 

5715.33 

5718.61 

5721.89 

5725.17 

5728.45 

5731.73 

5735.01 

5738.29 

1750 

5741.57 

5744.85 

5748.14 

5751.42 

5754.70 

5757.98 

5761.26 

5764.54 

5.767.82 

5771.10 

1760 

5774.38 

5777.66 

5780.94 

5784.23 

5787.51 

5790.79 

5794.07 

5797.35 

5800.63 

5803.91 

1770 

5807.19 

5810.47 

5813.75 

5817.0ST 

5820.32 

5823.60 

5826.88 

5830.16 

5833.44 

5836.72 

1780 

5840.00 

5843-28 

5846.56 

5849.84 

5853.12 

5856.40 

5859.69 

5862.97 

5866.25 

5869.53 

1790 

5872.81 

5876.09 

5879.37 

5882.65 

5885.93 

5889.21 

5892.49 

5895.78 

5899.06 

5902.34 

1800 

5905.62 

5908.90 

5912.18 

5915.46 

5918.74 

5922.02 

5925.30 

5928.58 

5931.87 

5935.15 

1810 

5938.43 

5941.71 

5944.99 

5948.27 

5951.55 

5954.83 

5958.11 

5961.39 

5964.67 

5967.96 

1820 

5971.24 

5974.52 

5977.80 

5981.08 

5984.36 

o987.64 

5990.92 

5994.20 

5997.48 

6000.76 

1830 

6004.05 

6007.33 

6010.61 

6013.89 

6017.17 

020.45 

6023.73 

6027.01 

6030.29 

6033.57 

1840 

6036.85 

040.14 

6043.42 

6046.70 

6049.98 

053.26 

6056.54 

6059.82 

6063.10 

6066.38 

1850 

6069.66 

072.94 

6076.23 

6079.51 

6082.79 

086.07 

6089.35 

6092.63 

6095.91 

6099.19 

1860 

6102.47 

105.75 

6109.03 

6112.32 

6115.60 

118.88 

6122.16 

6125.44 

6128.72 

6132.00 

1870 

6135.28 

138.56 

6141.84 

6145.12 

6148.40 

151.69 

6154.97 

6158.25 

6161.53 

6164.81 

1880 

6168.09 

171.37 

6174.65 

6177.93 

181.21 

184.49 

6187.78 

6191.06 

6194.34 

6197.62 

1890 

6200.90 

204.18 

6207.46 

6210.74 

214.02 

217.30 

6220.58 

6223.87 

6227.15 

6230.43 

1900 

6233.71 

6236.99 

6240.27 

6243.55 

246.83 

250.11 

6253.39 

6256.67 

259.96 

6263.24 

1910 

6266.52 

269.80 

6273.08 

6276.36 

279.64 

282.92 

6286.20 

6289.48 

292.76 

6296.05 

1920 

6299.33 

6302.61 

6305.89 

6309.17 

312.45 

315.73 

6329.01 

6322.29 

325.57 

328.85 

1930  , 

6332.14 

6335.42 

6338.70 

6341.98 

345.26 

348.54 

6351.82 

6355.10 

358.38 

361.66 

1940 

6364.94 

6368.23 

6371.51 

6374.79 

378.07 

381.35 

6384.63 

6387.91 

391.19 

394.47 

1950 

6397.75 

6401.03 

6404.32 

6407.60 

6410.88 

414.16 

6417.44 

6420.72 

424.00 

427.28 

1960 

6430.56 

6433.84 

6437.12 

6440.41 

6443.69 

446.97 

6450.25 

6453.53 

456.81 

6460.09 

1970 

6463.37 

6466.65 

6469.93 

6473.21 

6476.49 

479.78 

6483.06 

6486.34 

6489.62 

6492.90 

1980 

6496.18 

6499.46 

6502.74 

6506.02 

6509.30 

512.58 

6515.87 

6519.15 

6522.43 

6525.71 

1990 

6528.99 

6532.27 

6535.55 

6538.83 

6542.11 

545.39 

6548.67 

6551.96 

6555.24 

6558.52 

2000 

6561.80 

6565.08 

6568.36 

6571.64 

6574.92 

6578.20 

6581.48 

6584.76 

6588.05 

6591.33 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

D 


124 


CONVERSION    OF    METRES    INTO    ENGLISH    FEET    AND    DECIMALS. 


2000  to  2399. 


1 

/j  Metres. 

Metres.  (Units) 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

Eng.Feet.  Eng.Feet. 

Eng.Feet. 

EngfFeet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

2000 

6561.80 

6565.08 

6568.36 

6571.64 

6574.92 

6578.20 

6581.48 

6584.76 

6588.05 

6591.33 

2010 

6594.61 

6597.89 

6601.17 

6604.45 

6607.73 

6611.01 

6614.29 

6617.57 

6620.85 

6624.14 

2020 

6627.42 

6630.70 

6633.98 

6637.26 

6640.54 

6643.82 

6647.10 

6650.38 

6653.66 

6656.94 

2030 

6660.23 

6663.51 

6666.79 

6670.07 

6673.35 

6676.63 

6679.91 

6683.19 

6686.47 

6689.75 

2040 

6693.03 

6696.32 

6699.60 

6702.88 

6706.16 

6709.44 

6712.72 

6716.00 

6719.28 

6722.56 

2050 

6725.84 

6729.12 

6732.41 

6735.69 

6738.97 

6742.25 

6745.53 

6748.81 

6752.09 

6755.37 

2060 

6758.65 

6761.93 

6765.21 

6768.49 

6771.78 

6775.06 

6778.34 

6781.62 

6784.90 

6788.18 

2070 

6791.46 

6794.74 

6798.02 

6801.30 

6804.58 

6807.87 

6811.15 

6814.43 

6817.71 

6820.99 

2080 

6824.27 

6827.55 

6830.83 

6834.11 

6837.39 

6840.67 

6843.96 

6847.24 

6850.52 

6853.80 

2090 

6857.08 

6860.36 

6863.64 

6866.92 

6870.20 

6873.48 

6876.76 

6880.05 

6883.33 

6886.61 

2100 

6889.89 

6893.17 

6896.45 

6899.73 

6903.01 

6906.29 

6909.57 

6912.85 

6916.14 

6919.42 

2110 

6922.70 

6925.98 

6929.26 

6932.54 

6935.82 

6939.10 

6942.38 

6945.66 

6948.94 

6952.23 

2120 

6955.51 

6958.79 

6962.07 

6965.35 

6968.63 

6971.91 

6975.19 

6978.47 

6981.75 

6985.03 

2130 

6988.32 

6991.60 

6994.88 

6998.16 

7001.44 

7004.72 

7008.00 

7011.28 

7014.56 

7017.84 

2140 

7021.12 

7024.41 

7027.69 

7030.97 

7034.25 

7037.53 

7040.81 

7044.09 

70*7.37 

7050.65 

2150 

7053.93 

7057.21 

7060.49 

7063.78 

7067.06 

7070.34 

7073.62 

7076.90 

7080.18 

7083.46 

2160 

7086.74 

7090.02 

7093.30 

7096.58 

7099.87 

7103.15 

7106.43 

7109.71 

7112.99 

7116.27 

2170 

7119.55 

7122.83 

7125.11 

7129.39 

7132.67 

7135.96 

7139.24 

7142.52 

7145.80 

7149.08 

2180 

7152.36 

7155.64 

7158.92 

7162.20 

7165.48 

7168.76 

7172.05 

7175.33 

7178.61 

7181.89 

2190 

7185.17 

7188.45 

7191.73 

7195.01 

7198.29 

7201.57 

7204.85 

7208.14 

7211.42 

7214.70 

2200 

7217.98 

7221.26 

7224.54 

7227.82 

7231.10 

7234.38 

7237.66 

7240.94 

7244.23 

7247.51 

2210 

7250.79 

7254.07 

7257.35 

7260.63 

7263.91 

7267.19 

7270.47 

7273.75 

7277.03 

7280.32 

2220 

7283.60 

7286.88 

7290.16 

7293.44 

7296.72 

7300.00 

7303.28 

7306.56 

7309.84 

7313.12 

2230 

7316.41 

7319.69 

7322.97 

7326.25 

7329.53 

7332.81 

7336.09 

7339.37 

7342.65 

7345.93 

2240 

7349.21 

7352.49 

7355.78 

7359.06 

7362.34 

7365.62 

7368.90 

7372.18 

7375.46 

7378.74 

2250 

7382.02 

7385.30 

7388.58 

7391.87 

7395.15 

7398.43 

7401.71 

7404.99 

7408.27 

7411.55 

2260 

7414.83 

7418.11 

7421.39 

7424.67 

7427.96 

7431.24 

7434.52 

7437.80 

7441.08 

7444.36 

2270 

7447.64 

7450.92 

7454.20 

7457.48 

7460.76 

7464.05 

7467.33 

7470.61 

7473.89 

7477.17 

2280 

7480.45 

7483.73 

7487.01 

7490.29 

7493.57 

7496.85 

7500.14 

7503.42 

7506.70 

7509.98 

2290 

7513.26 

7516.54 

7519.82 

7523.10 

7526.38 

7529.66 

7532.94 

7536.23 

7539.51 

7542.79 

2300 

7546.07 

7549.35 

7552.64 

7555.91 

7559.19 

7562.47 

7565.75 

7569.03 

7572.32 

7575.60 

2310 

7578.88 

7582.16 

7585.44 

7588.72 

7592.00 

7595.28 

7598.56 

7601.84 

7605.12 

7608.41 

2320 

7611.69 

7614.97 

7618.25 

7621.53 

7624.81 

7628.09 

7631.37 

7634.65 

7637.93 

7641.21 

2330 

7644.50 

7647.78 

7651.06 

7654.34 

7657.62 

7660.90 

7664.18 

7667.46 

7670.74 

7674.02 

2340 

7677.30 

7680.58 

7683.87 

7687.15 

7690.43 

7693.71 

7696.99 

7700.27 

7703.55 

7706.83 

2350 

7710.11 

7713.39 

7716.67 

7719.96 

7723.24 

7726.52 

7729.80 

7733.08 

7736.36 

7739.64 

2360 

7742.92 

7746.20 

7749.48 

7752.76 

7756.05 

7759.33 

7762.61 

7765.89 

7769.17 

7772.45 

2370 

7775.73 

7779.01 

7782.29 

7785.57 

7788.85 

7792.14 

7795.42 

7798.70 

7801.98 

7805.26 

2380 

7808.54 

7811.82 

7815.10 

7818.38 

7821.66 

7824.94 

7828.23 

7831.51 

7834.79 

7838.07 

2390 

7841.35 

7844.63 

7847.91 

7851.19  7854.47 

7857.75 

7861.03 

7864.32 

7867.60 

7870.88 

0. 

1. 

2. 

3.    4. 

5. 

6.     7. 

§. 

9. 

D 


125 


CONVERSION    OF    METRES    INTO    ENGLISH    FEET    AND    DECIMALS. 

24OO  to  2799. 


Metres. 

Metres.  (Units.) 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

f. 

8. 

9. 

Eng.Feet.!  Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feat. 

Eng.Feet. 

Eng.Feet. 

2400 

7874.16 

7877.44 

7880.72 

7884.00 

7887.28 

7890.56 

7893.84 

7897.12 

7900.41 

7903.69 

2410 

7906.97 

7910.25 

7913.53 

7916.81 

7920.09 

7923.37 

7926.65 

7929.93  7933.21 

7936.50 

2420 

7939.78 

7943.06 

7946.34 

7949.62 

7952.90 

7956.18 

7959.46 

7962.74  7966.02 

7969.30 

2430 

7972.59 

7975.87 

7979.15 

7982.43 

7985.71 

7988.99 

7992.27 

7995.55  7998.83 

8002.11 

2440 

8005.39 

8008.67 

8011.96 

8015.24 

8018.52 

8021.80 

8025.08 

8028.36 

8031.64 

8034.92 

2450 

8038.20 

8041.48 

8044.76 

8048.05 

8051.33 

8054.61 

8057.89 

8061.17 

8064.45 

8067.73 

2460 

8071.01 

8074.29 

8077.57 

8080.85 

8084.14 

8087.42 

8090.70 

8093.98  8097.26 

8100.54 

2470 

8103.82 

8107.10 

8110.38 

8113.66 

8116.94 

8120.22 

8123.51 

8126.79  8130.07 

8133.35 

2480 

8136.63 

8139.91 

8143.19 

8146.47 

8149.75 

8153.03 

8156.32 

8159.60 

8162.88 

8166.16 

2490 

8169.44 

8172.72 

8176.00 

8179.28 

8182.56 

8185.84 

8189.12 

8192.41 

8195.69 

8198.97 

2500 

8202.25 

8205.53 

8208.81 

8212.09 

8215.37 

8218.65 

8221.93 

8225.21 

8228.50 

8231.78 

2510 

8235.06 

8238.34 

8241.62 

8244.90 

8248.18 

8251.46 

8254.74 

8258.02 

8261.30 

8264.59 

2520 

8267.87 

8271.15 

8274.43 

8277.71 

8280.99 

8284.27 

8287.55 

8290.83 

8294.11 

8297.39 

2530 

8300.67 

8303.96 

8307.24 

8310.52 

8313.80 

8317.08 

8320.36 

8323.64 

8326.92 

8330.20 

2540 

83&.4S 

8336.76 

8340.05 

8343.33 

8346.61 

8349.89 

8353.17 

8356.45 

8359.73 

8363.01 

2550 

8366.29 

8369.37 

8372.85 

8376.14 

8379.42 

8382.70 

8385.98 

8389.26 

8392.54 

8395.82 

2560 

8399.10 

8402.38 

8405.66 

8408.94 

8412.23 

8415.51 

8418.79 

8422.07 

8425.35 

8428.63 

2570 

8431.91 

8435.19 

8438.47 

8441.75 

8445.03 

8448.32 

8451.60 

8454.88 

8458.16 

8461.44 

2580 

8464.72 

8468.00 

8471.28 

8474.56 

8477.84 

8481.12 

8484.41 

8487.69 

8490.97 

8494.25 

2590 

8497.53 

8500.81 

8504.09 

8507.37 

8510.65 

8513.93 

8517.21 

8520.50 

8523.78 

8527.06 

2600 

8530.34 

8533.62 

8536.90 

8540.18 

8543.46 

8546.74 

8550.02 

8553.30 

8556.58 

8559.87 

2610 

8563.15 

8566.43 

8569.71 

8572.99 

8576.27 

8579.55 

8582.83 

8586.11 

8589.39 

8592.67 

2620 

8595.96 

8599.24 

8602.52 

8605.80 

8609.08 

8612.36 

8615.64 

8618.92 

8622.20 

8625.48 

2630 

8628.76 

8632.05 

8635.33 

8638.61 

8641.89 

8645.17 

8648.45 

8651.73 

8655.01 

8658.29 

2640 

8661.57 

8664.85 

8668.14 

8671.42 

8674.70 

8677.98 

8681.26 

8684.54 

8687.82 

8691.10 

2650 

8694.38 

8697.66 

8700.94 

8704.23 

8707.51 

8710.79 

8714.07 

8717.35 

8720.63 

8723.91 

2660 

8727.19 

8730.47 

8733.75 

8737.03 

8740.32 

8743.60 

8746.88 

8750.16 

8753.44 

8756.72 

2670 

8760.00 

8763.28 

8766.56 

8769.84 

8773.12 

8776.41 

8779.69 

8782.97 

8786.25 

8789.53 

2680 

8792.81 

8796.09 

8799.37 

8802.65 

8805.93 

8809.21 

8812.50 

8815.78 

8819.06 

8822.34 

2690 

8825.62 

8828.90 

8832.18 

8835.46 

8838.74 

8842.02 

8845.30 

8848.59 

8851.87 

8855.15 

2700 

8858.43 

8861.71 

8864.99 

8868.27 

8871.55 

8874.83 

8878.11 

8881.39 

8884.67 

8887.96 

2710 

8891.24 

8894.52 

8897.80 

8901.08 

8904.36 

8907.64 

8910.92 

8914.20 

8917.48 

8920.76 

2720 

8926.05 

8927.33 

8930.61 

8933.8.9 

8937.17 

8940.45 

8943.73 

8947.01 

8950.29 

8953.57 

2730 

8956.85 

8960.14 

8963.42 

8966.70 

8969.98 

8973.26 

8976.54 

8979.82 

8983.10 

8986.38 

2740 

8989.66 

8992.94 

8996.23 

8999.51 

9002.79 

9006.07 

9009.35 

9012.63 

9015.91 

9019.19 

2750 

9022.47 

9025.75 

9029.03 

9032.32 

9035.60 

9038.88 

9042.16 

9045.44 

9048.72 

9052.00 

2760 

9055.28 

9058.56 

9061.84 

9065.12 

9068.41 

9071.69 

9074.97 

9078.25 

9081.53 

9084.81 

2770 

9088.09 

9091.37 

9094.65 

9097.93  9101.21 

9104.50 

9107.78 

9111.06 

9114.34 

9117.62 

2780 

9120.90 

9124.18 

9127.46 

9130.74  9134.02 

9137.30 

9140.59 

9143.87 

9147.15 

9150.43 

2790 

9153.71 

9156.99 

9160.27 

9163.55  9166.83 

9170.11 

9173.39 

9176.68 

9179.96  9183.24 

0. 

1. 

2. 

3. 

4. 

5. 

6, 

* 

§. 

9. 

D 


126 


CONVERSION    OF    METRES    INTO    ENGLISH    FEET    AND    DECIMALS. 

2SOO  to  3OOO. 


Metres.  (Units) 

Metres. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

0. 

Ens.Feet.'Eiig.Feet. 

Eng.Feet. 

E.ig.Feet. 

Eng  Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

2800 

9186.52  9189.80 

9193.08 

9196.36 

9199.64 

9202.92 

9206.20 

9209.48 

9212.76 

9216.05 

2810 

9219.33  9222.61 

9225.89 

9229.17 

9232.45 

9235.73 

9239.01 

9242.29 

9245.57 

9248.85 

2820 

9252.14  9255.42 

9258.70 

9261.98 

9265.26 

9268.54  9271.82 

9275.10 

9278.38 

9281.66 

2830 

9284.94  9288.23 

9291.51 

9294.79 

9298.07 

9301.35  9304.64 

9307.91 

9311.19 

9314.47 

2840 

9317.75 

9321.03 

9324.32 

9327.60 

9330.88 

9334.16 

9337.44 

9340.72 

9344.00 

9347.28 

2850 

9350.56 

9353.84 

9357.12 

9360.41 

9363.69 

9366.97 

9370.25 

9373.53 

9376.81 

9380.09 

2860 

9383.37  9386.65 

9389.93 

9393.21 

9396.50 

9399.78 

9403.06 

9406.34 

9409.62 

9412.90 

2870 

9416.18  9419.46 

9422.74 

9426.02 

9429.30 

9432.59 

9435.87 

9439.15 

9442.43 

9445.71 

2880 

9448.99 

9452.27 

9455.55 

9458.83 

9462.11 

9465.39 

9468.68 

9471.96 

9475.24 

9478.52 

2890 

9481.80 

9485.08 

9488.36 

9491.64 

9494.92 

9498.20 

9501.48 

9504.76 

9508.05 

9511.33 

2900 

9514.61 

9517.89 

9521.17 

9524.45 

9527.73 

9531.01 

9534.29 

9537.57 

9540.85 

9544.14 

2910 

9547.42 

9550.70 

9553.98 

9557.26 

9560.54 

9563.82 

9567.10 

9570.38 

9573.66 

9576.94 

2920 

9580.23 

9583.51 

9586.79 

9590.07 

9593.35 

9596.63 

9599.91 

9603.19 

9606.47 

9609.75 

2930 

9613.03 

9616.32 

9619.60 

9622.88 

9626.16 

9629.44 

9632.72 

9636.00 

9639.28 

9642.56 

2940 

9645.84 

9649.12 

9652.41 

9655.69 

9658.97 

9662.25 

9665.53 

9668.81 

9672.09 

9675.37 

2950 

9678.62 

9681.93 

9685.21 

9688.50 

9691.78 

9695.06 

9698.34 

9701.62 

9704.90 

9708.18 

2960 

9711.46 

9714.74 

9718.02 

9721.30 

9724.59 

9727.87 

9731.15 

9734.43  9737.71 

9740.99 

2970 

9744.27 

9747.55  9750.83 

9754.11  9757.39 

9760.68 

9763.96 

9767.24  9770.52  9773.80 

i 

29SO 

9777.08 

9780.36  9783.64 

9786.92  9790.20 

9793.48  9796.76 

9800.05  9803.33 

9806.61 

2990 

9809.89 

9813.17 

9816.45 

9819.73  9823.01 

9826.29  '9829.57 

9832.85  '9836.  14 

9839.42 

3000 

9342.70 

9845.98 

9849.26 

9852.54  9855.82 

9859.10  9862.38 

9865.66  9868.94 

9872.23 

Proportional  Parts. 

Metres. 

Decimetres. 

O. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet. 

Eng.Feel. 

Eng.Feet. 

Eng.Feet. 

Eng.Feet 

Eng.Feet. 

Eng.Feet. 

Eng.Feel. 

0 

0.0000 

0^3281 

0^6562 

0^9843 

1.3124 

1.6404 

1.9685 

2.2966 

2.6247 

2.9528 

1 

3.2809 

3.6090 

3.9371 

4.2652 

4.5933 

4.9213 

5.2494 

5.5775 

5.9056 

6.2337 

2 

6.5618 

6.8899 

7.2180 

7.5461 

7.8742 

8.2022 

8.5303 

8.8584 

9.1865 

9.5146 

3 

9.8427 

10.1708 

10.4989 

10.8270  11.1551 

11.4831 

11.8112 

12.1393 

12.4674 

12.7955 

4 

13.1236 

13.4517 

13.7798 

14.1079 

14.4360 

14.7640 

15.0921 

15.4202 

15.7483 

16.0764 

5 

16.4045 

16.7326 

17.0607 

17.3888 

17.7169 

18.0449 

18.3730 

18.7011 

19.0292 

19.3573 

6 

19.6854 

20.0135 

20.3416 

20.6697 

20.9978 

21.3258 

21.6539 

21.9820 

22.3101 

22.6382 

7 

22.9663 

23.2944 

23.6225 

23.9506 

24.2787 

24.6067 

24.9348 

25.2629 

25.5910 

25.9191 

8 

26.2472 

26.5753 

26.9034 

27.2315 

27.5596 

27.8876 

28.2157 

28.5438 

28.8719 

29.2000 

9 

29.5281 

29.8562  30.1843 

30.5124 

30.8405 

31.1685 

31.4966 

31.8247 

31.1528 

32.4809 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

S. 

9. 

D 


127 


VIII.    CONVERSION    OF    METRES    INTO    AMERICAN    FEET    AND    DECIMALS. 
1  Metre  =  3.28070878  American  Feet. 


Hundreds. 

Metres. 

j| 

Thousands. 

0. 

100. 

200. 

300. 

400. 

500. 

600.     700. 

8OO. 

900. 

i 

Am.  Feet. 

Am  Feet 

Am.  Feet. 

Am.  Feet 

Am.  Feet 

Am.Feet 

Am.Feet 

Am.Feet. 

Am.Feet 

Am.Feet 

0 

0.0 

328.1 

656.1 

984.2 

1312.3 

1640.4 

1968.4 

2296.5 

2624.6 

2952.6 

1000 

3280.7 

3608.8 

3936.9 

4264.9 

4593.0 

4921.1 

5249.1 

5577.2 

5905.3 

6233.3 

2000 

6561.4 

6889.5 

7217.6 

7545.6 

7873.7 

8201.8 

8529.8 

8857.9 

9186.0 

9514.1 

3000 

9842.1 

10170.2 

10498.3 

10826.3 

11154.4 

11482.5 

11810.6 

12138.6 

12466.7 

12794.8 

4000 

13122.8 

13450.9 

13779.0 

14107.0 

14435.1 

14763.2 

15091.3 

15419.3 

15747.4 

16075.5 

5000 

16403.5 

16731.6 

17059.7 

17387.8 

17715.8 

18043.9 

18372.0 

18700.0 

19028.1 

19356.2 

6000 

19684.3 

20012.3 

20340.4 

20668.5 

20996.5 

21324.6 

21652.7 

21980.7 

22308.8 

22636.9 

7000 

22965.0 

23293.0  23621.1 

23949.2 

24277.2 

24605.3 

24933.4 

25261.5 

25589.S 

25917.6 

8000 

26245.7 

26573.7 

26901.8 

27229.9 

27558.0 

27886.0 

28214.1 

28542.2 

28870.2 

29198.3 

9000 

29526.4 

29854.4 

30182.5 

30510.6 

30838.7 

31166.7 

31494.8 

31822.9 

32150.9 

32479.0 

Units. 

Tens. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Am.  Feet 

Am  Feet. 

Am.  Feet 

Am.  Feet. 

Am.Feet 

Am  Fe«t. 

Am.Feet 

Am.Feet. 

Am  Feet. 

Am.Feet 

0 

0.000 

3.281 

6.561 

9.842 

13.123 

16.404 

19.684 

22.965 

26.246 

29.526 

10 

32.807 

36.088 

39.369 

42.649 

45.930 

49.211 

52.491 

55.772 

59.053 

62.333 

20 

65.614 

68.895 

72.176 

75.456 

78.737 

82.018 

85.298 

88.579 

91.860 

95.141 

30 

98.421 

191.702 

104.983 

108.263 

111.544 

114.825 

118.106 

121.386 

124.667 

127.948 

40 

131.228 

134.509 

137.790 

141.070 

144.351 

147.632 

150.913 

154.193 

157.474 

160.755 

50 

164.035 

167.316 

170.597 

173.878 

177.158 

180.439 

183.720 

187.000 

190.281 

193.562 

60 

196.843 

200.123 

203.404 

206.685 

209.965 

213.246 

216.527 

219.807 

223.088 

226.369 

70 

229.650 

232.930 

236.211 

239.492 

242.772 

246.053 

249.334 

252.615 

255.895 

259.176 

80 

262.457 

265.737 

269.018 

272.299 

275.580 

278.860 

282.141 

285.422 

288.702 

291.983 

90 

295.264 

298.544 

301.825 

305.106 

308.387 

311.667 

314.948 

318.229 

321.509 

324.790 

IX.   CONVERSION    OF    METRES   INTO  RHINE    OR    PRUSSIAN    FEET   AND    DECIMALS. 

1  Metre  =  3  1861995  Rhine  Feet. 

Metres. 

Hundreds. 

Thousands 

0. 

100. 

200. 

300. 

400. 

5OO. 

600. 

700. 

800. 

900. 

Rhine  Ft. 

Rhine  Ft. 

Rhine  Ft 

Rhine  Ft 

Rhine  Ft. 

Rhine  Ft 

Rhine  Ft. 

Rhine  Ft. 

Rhine  Ft. 

Rhine  Ft. 

0 

0.0 

318.6 

637.2 

955.9 

1274.5 

1593.1 

1911.7 

2230.3 

2549.0 

2867.6 

1000 

3186.2 

3504.8 

3823.4 

4142.1 

4460.7 

4779.3 

5097.9 

5416.5 

5735.2 

6053.8 

2000 

6372.4 

6691.0 

7009.6 

7328.3 

7646.9 

7965.5 

8284.1 

8602.7 

8921.4 

9240.0 

3000 

9558.6 

9877.2 

10195.8 

10514.5 

10833.1 

11151.7 

11470.3 

11788.9 

12107.6 

12426.2 

4000. 

12744.8 

13063.4 

13382.0 

13700.7 

14019.3 

14337.9 

14656.5 

14975.1 

15293.8 

15612.4 

5000 

15931.0 

16249.6 

16568.2 

16886.9 

17205.5 

17524.1 

17842.7 

18161.3 

18480.0 

18798.6 

6000 

19117.2 

19435.8 

19754.4 

20073.1 

20391.7 

20710.3 

21028.9 

21347.5 

21666.2 

21984.8 

7000 

22303.4 

22622.0 

22940.6 

23259.3 

23577.9 

23896.5 

24215.1 

24533.7 

24852.4 

25171.0 

8000 

25489.6 

25808.2 

26126.8 

26445.5 

26764.1 

27082.7 

27401.3 

27719.9 

28038.6 

28357.2 

9000 

28675.8 

28994.4 

29313.0 

29631.7 

29950.3 

30268.9 

30587.5 

30906.1 

31224.8 

31543.4 

D 


128 


TO   CONVERT 
PARIS     OR     FRENCH    FEET 

INTO  DIFFERENT  MEASURES  OF  LENGTH. 


X.    CONVERSION    OF    PARIS    OR    FRENCH    FEET    INTO    TOISES. 
1  French  Foot  =  0.1666666  Toise. 


FrenchFeet. 
Thousands. 

Hundreds. 

0. 

100. 

2OO. 

3OO. 

4OO. 

500. 

600. 

700. 

800. 

900. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises 

Toises. 

Toises. 

Toises. 

Toises- 

0 

0.00 

16.67 

33.33 

50.00 

66.67 

83.33 

100.00 

116.67 

133.33 

150.00 

1000 

166.67 

183.33 

200.00 

216.67 

233.33 

250.00 

266.67 

283.33 

300.00 

316.67 

2000 

333.33 

350.00 

366.67 

383.33 

400.00 

416.67 

433.33 

450.00 

466.67 

483.33 

3000 

500.00 

516.67 

533.33 

550.00 

566.67 

583.33 

600.00 

616.67 

633.33 

650.00 

4000 

666.67 

683.33 

700.00 

716.67 

733.33 

750.00 

766.67 

783.33 

800.00 

816.67 

5000 

833.33 

850.00 

866.67 

883.33 

900.00 

916.67 

933.33 

950.00 

966.67 

983.33 

6000 

1000.00 

1016.67 

1033.33 

1050.00 

1066.67 

1083.33 

1  100.00 

1116.67 

1133.33 

1150.00 

7000 

1166.67 

1183.33 

1200.00 

1216.67 

1233.33 

1250.00 

1266.67 

1283.33 

1300.00 

1316.67 

8000 

1333.33 

1350.00 

1366.67 

1383.33 

1400.00 

1416.67 

1433.33 

1450.00 

1466.67 

1483.33 

9000 

1500.00 

1516.67 

1533.33 

1550.00 

1566.67 

1583.33 

1600.00 

1616.67 

1633.33 

1650.00 

10000 

1666.67 

1683.33 

1700.00 

1716.67 

1733.33 

1750.00 

1766.67 

1783.33 

1800.00 

1816.67 

11000 

1833.33 

1850.00 

1866.67 

18S3.33 

1900.00 

1916.67 

1933.33 

1950.00 

1966.67 

1983.33 

12000 

2000.00 

2016.67 

2033.33 

2050.00 

2066.67 

2083.33 

2100.00 

2116.67 

2133.33 

2150.00 

13000 

2166.67 

2183.33 

2200.00 

2216.67 

2233.33 

2250.00 

2266.67 

2283.33 

2300.00 

2316.67 

14000 

2333.33 

2350.00 

2366.67 

2383.33 

2400.00 

2416.67 

2433.33 

2450.00 

2466.67 

2483.33 

15000 

2500.00 

2516.67 

2533.33 

2550.00 

2566.67 

2583.33 

2600.00 

2616.67 

2633.33 

2650.00 

16000 

2666.67 

2683.33 

2700.00 

2716.67 

2733.33 

2750.00 

2766.67 

2783.33 

2800.00 

2816.67 

17000 

2833.33 

2850.00 

2866.67 

2883.33 

2900.00 

2916.67 

2933.33 

2950.00 

2966.67 

2983.33 

18000 

3000.00 

3016.67 

3033.33 

3050.00 

3066.67 

3083.33 

3100.00 

3116.67 

3133.33 

•8150.00 

19000 

3166.67 

3183.33 

3200.00 

3216.67 

3233.33 

3250.00 

3266.67 

3283.33 

3300.00 

3316.67 

20000 

3333.33 

3350.00 

3366.67 

3383.33 

3400.00 

3416.67 

3433.33 

3450.00 

3466.67 

3483.33 

21000 

3500.00 

3516.67 

3533.33 

3550.00 

3566.67 

3583.33 

3600.00 

3616.67 

3633.33 

3650.00 

22000 

3666.67 

3683.33 

3700.00 

3716.67 

3733.33 

3750.00 

3766.67 

3783.33 

3800.00 

3816.67 

23000 

3833.33 

3850.00 

3866.67 

3883.33 

3900.00 

3916.67 

3933.33 

3950.00  3966.67 

3983.33 

24000 

4000.00 

4016.67 

4033.33 

4050.00 

4066.67 

4083.33 

4100.00 

4116.67 

4133.33 

4150.00 

25000 

4166.67 

4183.33 

4200.00 

4216.67 

4233.33 

4250.00 

4266.67 

4283.33 

4300.00 

4316.67 

26000 

4333.33 

4350.00 

4366.67  4383.33 

4400.00 

4416.67 

4433.33 

4450.00 

4466.67 

4483.33 

D 


129 


XI.     CONVERSION    OF    PARIS    OR    FRENCH    FEET    INTO    METRES. 
1  Paris  Foot  =  0.32483943  Metres. 


Hundreds. 

French 
Feet. 

Thousands. 

o. 

100. 

200. 

300. 

400. 

500. 

600. 

700. 

800. 

900. 

0 

Metres. 
000.00 

Metres. 
32.48 

Metres. 
64.97 

Metres. 
97.45 

Metres. 
129.94 

Metres. 
162.42 

Metres. 
194.90 

Metres. 
227.39 

Metres. 
259.87 

Metres. 
292.36 

1000 

324.84 

357.32 

389.81 

422.29 

454.78 

487.26 

519.74 

552.23 

584.71 

617.19 

2000 

649.68 

682.161  714.65 

747.13 

779.61 

812.10 

844.58 

877.07 

909.55 

942.03 

3000 

974.52 

1007.00 

1039.49 

1071.97 

1104.45 

1136.94 

1169.42 

1201.91 

1234.39 

1266.87 

4000 

1299.36 

1331.84 

1364.33 

1396.81 

1429.29 

1461.78 

1494.26 

1526.75 

1559.23 

1591.71 

5000 

1624.20 

1656.68 

1689.16 

1721.65 

1754.13 

1786.62 

1819.10 

1851.58 

1884.07 

1916.55 

6000 

1949.04 

1981.52 

2014.00 

2046.49 

2078.97 

2111.46 

2143.94 

2176.42 

2208.91 

2241.39 

7000 

2273.88 

2306.36 

2338.84 

2371.33 

2403.81 

2436.30 

2468.78 

2501.26 

2533.75 

2366.23 

8000 

2598.72 

2631.20 

2663.68 

2696.17 

2728.65 

2761.14 

2793.52 

2826.10 

2858.59 

2891.07 

9000 

2923.55 

2956.04 

2988.52 

3021.01 

3053.49 

3085.97 

3118.46 

3150.34 

3183.43 

3215.91 

10000 

3248.39 

3280.88. 

3313.36 

3345.85 

3378.33 

3410.81 

3443.30 

3475.78 

3508.27 

3540.75 

11000 

3573.23 

3605.72 

3638.20 

3670.69 

3703.17 

3735.65 

3768.14 

3800.62 

3833.11 

3865.59 

12000 

3898.07 

3930.56 

3963.04 

3995.52 

4028.01 

4060.49 

4092.98 

4125.46 

4157.94 

4190.43 

13000 

4222.91 

4255.40 

4287.88 

4320.36 

4352.85 

4385.33 

4417.82 

4450.30 

4482.78 

4515.27 

14000 

4547.75 

4580.24 

4612.72 

4645.10 

4677.59 

4710.07 

4742.56 

4775.04 

4807.52 

4840.01 

15000 

4872.59 

4905.08 

4937.56 

4970.04 

5002.53 

5035.01 

5067.49 

5099.98 

5132.46 

5164.95 

16000 

5197.43 

5229.91 

5262.40 

5294.88 

5327.37 

5359.85 

5392.33 

5424.82 

5457.30 

5489.79 

17000 

5522.27 

5554.75 

5587.24 

5619.72 

5652.21 

5684.69 

5717.17  5749.66 

5782.14 

5814.63 

18000 

5847.11 

5879.59 

5912.08 

5944.56 

5977.05 

6009.53 

6042.01  6074.50 

6106.98 

6139.47 

19000 

6171.95 

6204.43 

6236.92 

6269.40 

6301.88 

6334.37 

6366.85 

6399.34 

6431.82 

6464.30 

20000 

6496.79 

6529.27 

6561.76 

6594.24 

6626.72 

6659.21 

6691.69 

6724.18 

6756.66 

6789.14 

21000 

6821.63 

6854.11 

6886.60 

6919.08 

6951.56 

6984.05 

7016.53j7049.02 

7081.50 

7113.98 

22000 

7146.47 

7178.95 

7211.44 

7243.92 

7276.40 

7308.89 

7341.37 

7373.86 

7406.34 

7438.82 

23000 

7471.31 

7503.79 

7536.27 

7568.76 

7601.24 

7633.73 

7666.21 

7698.69 

7731.18 

7763.66 

24000 

7796.15 

7828.63 

7861.11 

7893.60 

7926.08 

7958.57 

7991.05 

8023.53 

8056.02 

8088.50 

25000 

8120.99 

8153.47 

8185.95 

8218.44 

8250.92 

8283.41 

8315.89 

8448.37 

8380.86 

8413.34 

26000 

8445.83 

8478.31 

8510.79 

8543.28  8575.76 

8608.24 

8640.73  8673.21 

S705.70 

8738.18 

27000 

8770.66 

8803.15 

8835.63 

8868.12  8900.60 

8933.08 

8965.57  8998.05 

9030.54 

9063.02 

Units. 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

0 

0.0000 

0.3248 

0.6497 

0.9745 

1.2994 

1.6242 

1.9490 

2.2739 

2.5987 

2.9236 

10 

3.2484 

3.5732 

3.8981 

4.2229 

4.5478 

4.S726 

5.1974 

5.5223 

5.8471 

6.1719 

20 

6.496S 

6.8216 

7.1465 

7.4713 

7.7961 

8.1210 

8.4458 

8.7707 

9.0955 

9.4203 

30 

9.7452 

10.0700 

10.3949 

10.7197 

11.0445 

11.3694 

11.6942 

12.0191 

12.3439 

12.6687 

40 

12.9936 

13.3184 

13.6433 

13.9681 

14.2929 

14.6178 

14.9426 

15.2675 

15.5923 

15.9171 

50 

16.2420 

16.5668 

16.8916 

17.2165 

17.5413 

17.8662 

18.1910 

18.5158 

18.8407 

19.1655 

60 

19.4904 

198152 

20.1400 

20.4619 

20.7897 

21.1146 

21.4394 

21.7642 

22.0891 

22.4139 

70 

22.7388 

23.06361  23.3884 

23.7133 

24.0381 

24.3630 

24.6878 

25.0126 

25.3375 

25.6623 

80 

25.9872 

26.3120 

26.6368 

26.9617 

27.2865 

27.6114 

27.9362 

28.2610 

28.5859 

28.9107 

90 

29.2355 

29.5604 

29.8852 

30.2101 

30.5349 

30.8597 

31.1846 

31.5094 

31.8343 

32.1591 

D 


130 


X:i.       CONVERSION  OF  PARIS  OR  FRENCH  FEET  INTO  ENGLISH  FEET  AND  DECIMALS. 
1  French  Foot  =  1.065765424  English  Feet. 


Hundreds. 

French  Feet. 

Thousands. 

0. 

100. 

200. 

3OO. 

1OO. 

5OO. 

6OO. 

700. 

800. 

9OO. 

1 

Eng.  feet 

Eng.  feet  Eng  feet 

Eng  feet 

Eng.  feet 

Eng.  feet.  Eng.  foet.  Eng.  feet 

Eng.  feet.  'Eng.  feet. 

0 

0.0 

106.6 

213.2 

319.7 

426.3 

532.9 

639.5 

746.0 

852.6 

959.2 

1000 

1065.8 

1172.3 

1278.9 

1385.5 

1492.1 

1598.6 

1705.2 

1811.8 

1918.4 

2025.0 

2000 

2131.5 

2238.1 

2344.7 

2451.3 

2557.8 

2664.4 

2771.0 

2877.6 

2984.1 

3090.7 

3000 

3197.3 

3303.9 

3410.4 

3517.0 

3623.6 

3730.2 

3836.8 

3943.3 

4049.9 

4156.5 

4000 

4263.1 

4369.6 

4476.2 

4582.8 

4689.4 

4795.9 

4902.5 

5009.1 

5115.7 

5222.3 

5000 

5328.8 

5435.4 

5542.0 

5648.6 

5755.1 

5861.7 

5968.3 

6074.9 

6181.4 

6288.0 

6000 

6394.6 

6501.2 

6607.7 

6714.3 

6S20.9 

6927.5 

7034.1 

7140.6 

7247.2 

7353.8 

7000 

7460.4 

7566.9 

7673.5 

7780.1 

7S8&7 

7993.2 

8099.8 

8206.4 

8313.0 

8419.5 

8000 

8526.1 

8632.7 

8739.3 

8845.9 

8952.4 

9059.0 

9165.6 

9272.2 

9378.7 

9485.3 

9000 

9591.9 

9698.5 

9805.0 

9911.6 

10018.2 

10124.8 

10231.3 

10337.9 

10444.5 

10551.1 

10000 

10657.7 

10764.2 

10870.8 

10977.4 

11084.0 

11190.5 

11297.1 

11403.7 

11510.3 

11616.8 

11000 

11723.4 

11830.0 

11936.6 

12043.1 

12149.7 

12256.3 

12362.9 

12469.5 

12576.0 

12682.6 

12000 

12789.2 

12895.8  13002.3 

13108.9 

13215.5 

13322.1 

13428.6 

13535.2 

13641.8 

13748.4 

13000 

13855.0 

13961.5  1  14068.1 

14174.7 

142S1.3 

14387.8 

14494.4 

14601.0 

14707.6 

14814.1 

14000 

14920.7 

15027.3 

15133.9 

15240.4 

15347.0 

15453.6 

15560.2 

15666.8 

15773.3 

15879.9 

15000 

15986.5 

16093.1 

16199.6 

16306.2 

16412.8 

16519.4 

16625.9 

16732.5 

16839.1 

16945.7 

16000 

17052.2 

17158.8 

17265.4 

17372.0 

17478.6 

17585.1 

17691.7 

17798.3 

17904.9 

18011.4 

17000 

18118.0 

18224.6 

18331.2 

18437.7 

18544.3 

18650.9 

18757.5 

18864.0 

18970.6 

19077.2 

18000 

19183.8 

19290.4 

19396.9 

19503.5 

19610.1 

19716.7 

19823.2 

19929.8 

20036.4 

20143.0 

19000 

20249.5 

20356.1 

20462.7 

20569.3 

20675.8 

20782.4 

20889.0 

20995.6 

21102.2 

21208.7 

20000 

21315.3 

21421.9 

21528.5 

21635.0 

21741.6 

21848.2 

22054.8 

22161.3 

22167.9 

22274.5 

21000 

22381.1 

22487.7 

22594.2 

22700.8 

22807.4 

22914.0 

23020.5  23127.1 

23233.7 

23340.3 

22000 

23446.8 

23553.4 

23660.0 

23766.6 

23873.1 

23979.7 

24086.3  24192.9 

24299.5 

24406.0 

23000 

24512.6 

24619.2 

24725.8 

24832.3 

24938.9 

25045.5 

25152.1 

25258.6 

25365.2 

25471.8 

24000 

25578.4 

25684.9 

25791.5 

25898.1 

26004.7 

26111.3 

26217.8 

26324.4 

26431.0 

26537.6 

25000 

26644.1 

26750.7 

26857.3 

26963.9 

27070.4 

27177.0 

27283.6 

27390.2 

27496.7 

27603.3 

26000 

27709.9 

27816.5  27923.1 

28029.6  28136.2 

28242.8  28349.4 

28455.9!28562.5 

28669.1 

27000 

28775.7J28882.2  289S8.8 

29095.4  29202.0 

29308.5  29415.1 

29521.7  29628.3 

29734.9 

Units. 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

0. 

Eng.  feet. 

Eng  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng  feet. 

Eng.  feet. 

Eng  feet. 

Eng  feet. 

Eng.  feet 

0 

0.000 

1.066 

2.132 

3.197 

4.263 

5.329 

6.395 

7.460 

8.526 

9.592 

10 

10.658 

11.723 

12.789 

13.855 

14.921 

15.986 

17.052 

18.118 

19.184 

20.250 

20 

21.315 

22.381 

23.447 

24.513 

25.578 

26.644 

27.710 

28.776 

29.841 

30.907 

30 

31.973 

33.039 

34.104 

35.170 

36.236 

37.302 

38.368 

39.433 

40.499 

41.565 

40 

42.631 

43.696 

44.762 

45.828 

46.894 

47.959 

49.025 

50.091 

51.157 

52.223 

50 

53.288 

54.354 

55.420 

56.486 

57.551 

58.617 

59.683 

60.749 

61.814 

62.880 

60 

63.946 

65.012 

66.077 

67.143 

68.209 

69.275 

70.341 

71.406 

72.472 

73.538 

70 

74.604 

75.669 

76.735 

77.801 

78.867 

79.932 

80.998 

82.064 

83.130 

84.195 

80 

85.261 

86.327 

87.393 

88.459 

89.524 

90.590 

91.656 

92.722 

93.787 

94.853 

90 

95.919 

96.985 

98.050 

99.116 

100.182 

101.248 

102.313 

103.379 

104.445 

105.511 

D 


131 


XIII.    CONVERSION    OF    PARIS    OR    FRENCH    FEET    INTO    AMERICAN    FEET. 
1  French  Foot  =  1.06570358  American  Foot. 


French  Feet. 
Thousands. 

Hundreds. 

0. 

100. 

200. 

300. 

400. 

500. 

600. 

700. 

soo. 

900. 

0 

Am.  Feet 
0.0 

Am.Feet 
106.6 

Am.  Feet. 
213.1 

Am.  Feet. 
319.7 

Am  Feet 
426.3 

Am.Feet 
532.9 

Am.Feet 
639.4 

Am.Feet. 
746.0 

Am.Feet 
852.6 

Am.Feet. 
959.1 

1000 

1065.7 

1172.3 

1278.8 

1385.4 

1492.0 

1598.6 

1705.1 

1811.7 

1918.3 

2024.8 

2000 

2131.4 

2238.0 

2344.5 

2451.1 

2557.7 

2664.3 

2770.8 

2S77.4 

2984.0 

3090.5 

3000 

3197.1 

3303.7 

3410.3 

3516.8 

3623.4 

3730.0 

3836.5 

3943.1 

4049.7 

4156.2 

4000 

4262.8 

4369.4 

4476.0 

4582.5 

4689.1 

4795.7 

4902.2 

5008.8 

5115.4 

5221.9 

5000 

5328.5 

5435.1 

5541.7 

5648.2 

5754.8 

5861.4 

5967.9 

6074.5 

6181.  1 

6287.7 

6000 

6394.2 

6500.8 

6607.4 

6713.9 

6820.5 

6927.1 

7033.6 

7140.2 

7246.8 

7353.4 

7000 

7459.9 

7566.5 

7673.1 

77794J 

7886.2 

7992.8 

8099.3 

8205.9 

8312.5 

8419.1 

8000 

8525.6 

8632.2 

8738.8 

8845.3 

8951.9 

9058.5 

9165.1 

9271.6 

9378.2 

9484.8 

9000 

9591.3 

9697.9 

9804.5 

9911.0 

10017.6 

10124.2 

10230.8 

10337.3 

10443.9 

10550.5 

10000 

10657.0 

10763.6 

10870.2 

10976.7 

11033.3 

11189.9 

11296.5 

11403.0 

11509.6 

11616.2 

11000 

11722.7 

11829.3 

11935.9 

12042.5 

12149.0 

12255.6 

12362.2 

12468.7 

12575.3 

12681.9 

12000 

12788.4 

12895.0 

13001.6 

13108.2 

13214.7 

13321.3 

13427.9 

13534.4 

13641.0 

13747.6 

13000 
14000 

13854.1 
14919.9 

13960.7 
15*026.4 

14067.3 
15133.0 

14173.9 
15239.6 

14280.4 
15346.1 

14387.0 
15452.7 

14493.6 
15559.3 

14600.1 
15665.8 

14706.7 
15772.4 

14813.3 
15879.0 

15000 

15985.6 

16092.1 

16198.7 

16305.3 

16411.8 

16518.4 

16625.0 

16731.5 

16838.1 

16944.7 

16000 

17051.3 

17157.8 

17264.4 

17371.0 

17477.5 

17584.1 

17690.7 

17797.2 

17903.8 

18010.4 

nooo 

18117.0 

18223.5 

18330.1 

18436.7 

18543.2 

18619.8 

18756.4 

18863.0 

18969.5 

19076.1 

18000 

19182.7 

19289.2 

19395.8 

19502.4 

1960S.9 

19715.5 

19822.1 

19928.7 

20035.2 

20141.8 

19000 

20248.4 

20354.9 

20461.5 

20568.1 

20674.6 

20781.2 

20887.8 

20994.4 

21100.9 

21207.5 

20000 

21314.1 

21420.6 

21527.2 

21633.8 

21740.4 

21846.9 

21953.5 

22060.1 

22166.6 

22273  2 

21000 

22379.8 

22486.3 

22592.9 

22699.5 

22806.1 

22912.6 

23019.2 

23125.8 

23232-3 

23338.9 

22000 

23445.5 

23552..0 

23658.6 

23765.2 

23871.8 

23978.3 

24084.9 

24191.5  24298.0 

24404.6 

23000 

24511.2 

24617.8 

24724.3 

24830.9 

24937.5 

25044.0 

25150.6 

25257.2  25363.7 

25470.3 

24000 

25576.9 

25683.5 

25790.0 

25896.6 

26003.2 

26109.7 

26216.3 

26322.9 

16429.4 

26536.0 

25000 

26642.6 

26749.2 

26855.7 

26962.3 

27068.9 

27175.4 

27282.0 

27388.6 

27495.2 

27601.7 

26000 
27000 

27708.3 
28774.0 

27814.9 

28880.6 

27921.4 

28987.1 

28028.0 
29093.7 

28134.6 
29200.3 

28241.1 

29306.8 

28347.7 
29413.4 

28454.3  28560.9 
29520.0  29626.6 

28667.4 
29733.1 

2SOOO 

29839.7 

29946.3 

30052.8  30159.4 

30266.0 

30372.6  30479.1 

30585.7  30692.3 

30799.8 

Tens. 

Units. 

o. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Am.  Feet. 

Am.Feet. 

Am  Feet. 

Am.Feet. 

Am  Feet 

Am  Feet. 

Am.Feet. 

Am  Feet. 

Am  Feet 

Am.Feet. 

0 

0.00 

1.07 

2.13 

3.20 

4.26 

5.33 

6.39 

7.46 

8.53 

9.59 

10 

10.66 

11.72 

12.79 

13.85 

14.92 

15.99 

17.05 

18.12 

19.18 

20.25 

20 

21.31 

22.38 

23.45 

24.51 

25.58 

26.64 

27.71 

28.77 

29.84 

30.91 

30 

31.97 

33.04 

34.10 

35.17 

36.23 

37.30 

38.37 

39.43 

40.50 

41.56 

40 

42.63 

43.69 

44.76 

45.83 

46.89 

47.96 

49.02 

50.09 

51.15 

52.22 

50 

53.29 

54.35 

55.42 

56.48 

57.55 

58.61 

59.68 

60.75 

61.81 

62.88 

60 

63.94 

65.01 

66.07 

67.14 

68.21 

69.27 

70.34 

71.40 

72.47 

73.53 

70 

74.60 

75.66 

76.73 

77.80 

78.86 

79.93 

80.99 

82.06 

83.12 

84.19 

80 

85.26 

86.32 

87.39 

88.45 

89.52 

90.58 

91.65 

92.72 

93.78 

94.85 

90 

95.91 

96.98 

98.04 

99.11 

100.18 

101.24 

102.31 

103.37 

104.44 

105.50 

D 


132 


TO   CONVERT 
ENGLISH    YARDS    AND    FEET 

INTO  DIFFERENT  MEASURES   OF  LENGTH. 


XIV.      CONVERSION    OF    ENGLISH    YARDS    INTO    FRENCH    TOISES. 
1  English  Yard  =  0.4691464  Toise. 


Hundreds. 

English 

Thousands. 

0. 

100. 

2OO. 

3OO. 

400. 

5OO. 

600. 

700. 

§00. 

900. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises 

Toises. 

Toises. 

Toises. 

0 

0.00 

46,91 

93.83 

140.74 

187.66 

234.57 

281.49 

32840 

375.32 

422.23 

1000 

469.15 

516.06 

562.98 

609.89 

656.80 

703.72 

750.63 

7$7.55 

844.46 

891.38 

2000 

938.29 

985.21 

1032.12 

1079.04 

1125.95 

1172.87 

1219.78 

1266.70 

1313.61 

1360.52 

3000 

1407.44 

1454.35 

1501.27 

1548.18 

1595.10 

1642.01 

1688.93 

1735.84 

1782.76 

1829.67 

4000 

1876.59 

1923.50 

1970.41 

2017.33 

2064.24 

2111.16 

2158.07 

2204.99 

2251.90 

2298.82 

5000 

2345.73 

2392.65 

2439.56 

2486.48 

2533.39 

2580.31 

2627.22 

2674.13 

2721.05 

2767.96 

6000 

2814,88 

2861.79 

2908.71 

2955.62 

3002.54 

3049.45 

3096.37 

3143.28 

3190.20 

3237.11 

7000 

3284.02 

3330.94 

3377.85 

3424.77 

3471.68 

3518.60  3565.51 

3612.43 

3659.34 

3706.26 

8000 

3753.17 

3800.09 

3847.00 

3893.92 

3940.83 

3987.74  4034.66 

4081.57 

4128.49  4175.40 

9000 

4222.32 

4269.23 

4316.15 

4363.06 

4409.98 

4456.89  4503.81 

4550.72 

4597.63  4644.55 

XV.     CONVERSION    OF    ENGLISH   YARDS    INTO    METRES. 

1  English  Yard  =  0.91438347  Metre. 

Hundreds. 

English 

Thousands. 

0. 

100. 

200. 

3OO. 

400. 

500. 

600. 

700. 

8OO. 

900. 

Metres. 

Metres. 

Metres 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

0 

0.00 

91.44 

182.88 

274.32 

365.75 

457.19 

548.63 

640.07 

731.51 

822.95 

1000 

914.38 

1005.82 

1097.26 

1188.70 

1280-14 

1371.58 

1463.01 

1554.45 

1645.89 

1737.33 

2000 

1828.77 

1920.21 

2011.64 

2103.08 

2194.52 

2285.96 

2377.40 

2468.84 

2560.27 

2651.71 

3000 

2743.15 

2834.59 

2926.03 

3017.47 

3108.90 

3200.34 

3291.78 

3383.22 

3474.66 

3566.10 

4000 

3657.53 

3748.97 

3840.41 

3931.85 

4023.29 

4114.73 

4206.16 

4297.60 

4389.04 

4480.48 

5000 

4571.92 

4663.36 

4754.79 

4846.23 

4937.67 

5029.11 

5120.55 

5211.99 

5303.42 

5394.86 

6000 

5486.30 

5577.74 

5669.18 

5760.62 

5852.05 

5943.49  6034.93 

6126.37 

6217.81 

6309.25 

7000 

6400.68 

6492.12 

6583.56 

6675.00 

6766.44 

6857.88  6949.31 

7040.75 

7132.19 

7223.63 

8000 

7315.07 

7406.51 

7497.94 

7589.38 

7680.82 

7772.26  7863.70 

7955.14 

8046.57 

8138.01 

9000 

8229-45 

8320.89 

8412.33 

8503.77 

8595.20 

8686.64  8778.08 

8869.52 

8960.96 

9052.40 

D 


133 


XVI.    CONVERSION    OF    ENGLISH    FEET    INTO    METRES. 


1  English  Foot  =  0.30479449  Metre. 


;l 

Hundreds. 

English 

1! 

Feet. 
Thousands. 

o. 

100. 

'200. 

3OO. 

100. 

500. 

6OO. 

700. 

800. 

900. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres.  I 

0 

000.000 

30.4794 

60.9589 

91.4383 

121.918 

152.397 

182.877 

213.356 

243.836 

274.315  1 

1000 

304.794 

335.274 

365.763 

396.233 

426.712 

457.192 

487.671 

518.151 

548.630 

579.110 

2000 

609.589 

640.068 

670.548 

701.027 

731.507 

761.986 

792.466 

822.945 

853.425 

883.904 

3000 

914.383 

944.863 

975.342 

1005.82 

1036.30 

1066.78 

1097.26 

1127.74 

1158.22 

1188.70 

4000  . 

1219.18 

1249.66 

1280.14 

1310.62 

1341.10 

1371.58 

1402.05 

1432.53 

1463.01 

1493.49 

\ 

5000 

1523.97 

1554.45 

1584.93 

1615.41 

1645.89 

1676.37 

1706.85 

1737.33 

1767.81 

1798.29 

6000 

1828.77 

1859.25 

1889.73 

1920.21 

1950.68 

1981.16 

2011.64 

2042.12 

2072.60  2103.08  1 

7000 

2133.56 

2164.04 

2194.52 

2225.00 

2255.48 

2285.96 

2316.44 

2346.92 

2377.40  2407.88  | 

8000 

2438.36 

2468.84 

2499.31 

2529.79 

2560.27 

2590.75 

2621.23 

2651.71 

2682.19  2712.67 

9000 

2743.15 

2773.63 

2804.11 

2834.59 

2865.07 

2895.55 

2926.03 

2956.51 

2986.99 

3017.47 

10000 

3047.94 

3078.42 

3108.90 

3139.38 

3169.86 

3200.34 

3230.82 

3261.30 

3291.78 

3322.26 

11000 

3352.74 

3383.22 

3413.70 

3444.18 

3474.66 

3505.14 

3535.62 

3566.10 

3596.57 

3627.05 

12000 

3657.53 

3688.01 

3718.49 

3748.97 

3779.45 

3809.93 

3840.41 

3870.89 

3901.37 

3931.85 

13000 

3962.33 

3992.81 

4023.29 

4053.77 

4084.25 

4114.73 

4145.21 

4175.68 

4206.16J4236.64 

14000 

4267.12 

4297.60 

4228.08 

4358.56 

4389.04 

4419.52 

4450.00 

4480.48 

4510.96 

4541.44 

15000 

4571.92 

4602.40 

4632.88 

4663.36 

4693.84 

4724.31 

4754.79 

4785.27 

4815.75 

4846.23 

16000 

4876.71 

4907.19 

4937.67 

4968.15 

4998.63 

5029.11 

5059.59 

5090.07 

5120.55 

5151.03 

17000 

5181.51 

5211.99 

5242.47 

5272.94 

5303.42 

5333.90 

5364.38 

5394.86 

5425.34 

5455.82 

18000 

5486.30 

5516.78 

5547.26 

5577.74 

5608.22 

5638.70 

5669.18 

5699.66 

5730.14 

5760.62 

19000 

5791.10 

5821.57 

5852.05 

5882.53 

5913.01 

5943.49 

5973.97 

6004.45 

6034.93 

6065.41 

20000 

6095.89 

6126.37 

6156.85 

6187.33 

6217.81 

6248.29 

6278.77 

6309.25 

6339.73 

6370.20 

21000 

6400.68 

6431.16 

6461.64 

6492.12 

6522.60 

6553.08 

6583.56 

6614.04 

6644.52 

6675.00 

22000 

6705.48 

6735.96 

6766.44 

6796.92 

6827.40 

6857.88 

6888.36 

6918.83 

6949.31 

6979.79 

23000 

7010.27 

7040.75 

7071.23 

7101.71 

7132.19 

7162.67 

7193.15 

7223.63 

7254.11 

7284.59 

24000 

7315.07 

7345.55 

7376.03 

7406.51 

7436.99 

7467.47 

7497.94 

7528.42 

7558.90 

7589.38 

25000 

7619.86 

7650.34 

7680.82 

7711.30 

7741.78 

7772.26 

7802.74 

7833.22 

7863.70 

7894.18 

26000 

7924.66 

7955.14 

7985.62 

8016.10 

8046.57 

8077.05  8107.53 

8138.01 

8168.49 

8198.97 

27000 

8229.45 

8259.93 

8290.41 

8320.89 

8351.37 

8381.85 

8412.33 

8442.81 

8473.29 

8503.77 

28000 

8534.25 

8564.73 

8595.20  8625.68 

8656.16 

8686.64 

8717.12 

8747.60 

8778.08 

8808.56 

Units. 

Tens. 

Q. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

0 

0.00000 

0.30479 

0.60959 

0.91438 

1.21918 

1.52397 

1.82877 

2.13356 

2.43836 

2.74315 

10 

3.04794 

3.35274 

3.65753 

3.96233 

4.26712 

4.57192 

4.87671 

5.18151 

5.48630 

5.79110 

20 

6.09589 

6.40068 

6.70548 

7.01027 

7.31507 

7.61986 

7.92466 

8.22945 

8.53425 

8.83904 

30 

9.14383 

9.44863 

9.75342 

10.0582 

10.3630 

10.6678 

10.9726 

11.2774 

11.5822 

11.8870 

40 

12.1918 

12.4966 

12.8014 

13.1062 

13.4110 

13.7158 

14.0205 

14.3253 

14.6301 

14.9349 

50 

15.2397 

15.5445 

15.8493 

16.1541 

16.4589 

16.7637 

17.0685 

17.3733 

17.6781 

17.9829 

60 

18.2877 

18.5925 

18.8973 

19.2021 

19.5068 

19.8116 

20.1164 

20.4212 

20.7260 

21.0308 

70 

21.3356 

21.6404 

21.9452  |22.2500 

22.5548 

22.8596 

23.1644 

23.4692 

23.7740 

24.0788 

80 

24.3836 

24.6884 

24.9931 

25.2979 

25.6027 

25.9075 

26.2123 

26.5171 

26.8219J27.  1267 

90 

27.4315 

27.7363 

28.0411 

28.3459 

28.6507 

28.9555 

29.2603 

29.5651 

29.8699i  30.1747 

D 


134 


XVII.       CONVERSION  OF  ENGLISH  FEET  INTO  FRENCH  OR  PARIS  FEET  AND  DECIMALS. 
1  English  Foot  =  0.93829277  Paris  Foot. 


Hundreds. 

English 

Feet. 
Thousands. 

o. 

100. 

200. 

300. 

400. 

5OO. 

600. 

700. 

800. 

900. 

Par.  Feet. 

Par.  Feet.  Par.  Feet. 

Par.  Feet. 

Par.  Feet. 

Par.  Feet.  Par.  Feet. 

Par.  Feet. 

Par.  Feet 

Par.  Fe«t. 

0 

000.0 

93.8 

187.7 

281.5 

375.3 

469.1 

563.0 

656.8 

750.6 

844.5 

1000 

938.3 

1032.1 

1126.0 

1219.8 

1313.6 

1407.4 

1501.3 

1595.1 

1688.9 

1782.8 

2000 

1876.6 

1970.4 

2064.2 

2158.1 

2251.9 

2345.7 

2439.6 

2533.4 

2627.2 

2721.0 

3000 

2814.9 

2908.7 

3002.5 

3096.4 

3190.2 

3284.0 

3377.9 

3471.7 

3565.5 

3659.3 

4000 

3753.2 

3847.0 

3940.8 

4034.7 

4128.5 

4222.3 

4316.1 

4410.0 

4503.8 

4597.6 

5000 

4691.5 

4785.3 

4879.1 

4973.0 

5066.8 

5160.6 

5254.4 

5348.3 

5442.1 

5535.9 

6000 

5629.8 

5723.6 

5817.4 

5911.2 

6005.1 

6098.9 

6192.7 

6286.6 

6380.4 

6474.2 

7000 

6568.0 

6661.9 

6755.7 

6849.5 

6943.4 

7037.2 

7131.0 

7224.9 

7318.7 

7412.5 

8000 

7506.3 

7600.2 

7694.0 

7787.8 

7881.7 

7975.5 

8069.3 

8163.1 

8257.0 

8350.8 

9000 

8444.6 

8538.5 

8632.3 

8726.1 

8820.0 

8913.8 

9007.6 

9101.4 

9195.3 

9289.1 

10000 

9382.9 

9476.8 

9570.6 

9664.4 

9758.2 

9852.1 

9945.9 

10039.7 

10133.6 

10227.4 

11000 

10321.2 

10415.0 

10508.9 

10602.7 

10696.5 

10790.4 

10884.2 

10978.0 

11074-9 

11165.7 

12000 

11259.5 

11353.3 

11447.2 

11541.0 

11634.8 

11728.7 

11822.5 

11916.3 

12010.1 

12104.0 

13000 

12197.8 

12291.6 

12385.5 

12479.3 

12573.1 

12667.0 

12760.8 

12854.6 

12948.4 

13042.3 

14000 

13136.1 

13229.9 

13323.8 

13417.6 

13511.4 

13605.2 

13699.1 

13*792.9 

13886.7 

13980.6 

15000 

14074.4 

14168.2 

14262.0 

14355.9 

14449.7 

14543.5 

14637.4 

14731.2 

14825.0 

14918.9 

16000 

15012.7 

15106.5 

15200.3 

15294.2 

15388.0 

15481.8 

15575.7 

15669.5 

15763.3 

15857.1 

17000 

15951.0 

16044.8 

16138.6 

16232.5 

16326.3 

16420.1 

16514.0  16607.8 

16701.6 

16795.4 

18000 

16889.3 

16983.1 

17076.9 

17170.8 

17264.6 

17358.4 

17452.2 

17546.1 

17639.9 

17733.7 

19000 

17827.6 

17921.4 

18015.2 

18109.0 

18202.9 

18296.7 

18390.5 

18484.4 

18578.2 

18672.0 

20000 

18765.9 

18859.7 

18953.5 

19047.3 

19141.2 

19235.0 

19328.8 

19422.7 

19516.5 

19610.3 

21000 

19704.1 

19798.0 

19891.8 

19985.6 

20079.5 

20173.3 

20267.1 

20361.0 

20454.8 

20548.6 

22000 

20642.4 

20736.3 

20830.1 

20923.9 

21017.8 

21111.6 

21205.4 

21299.2 

21393.1 

21486.9 

23000 

21580.7 

21674.6  21768.4 

21862.2 

21956.0 

22049.9 

22143.7 

22237.5 

22331.4 

22425.2 

24000 

22519.0 

22612.9 

22706.7 

22800.5 

22894.3 

22988.2 

23082.0 

23175.8 

23269.7 

23363.5 

.  25000 

23457.3 

23551.1 

23645.0 

23738.8 

23832.6 

23926.5 

21020.3 

24114.1 

24208.0 

24301.8 

26000 

24395.6 

24489.4 

24583.3 

24677.1 

24770.9 

24864.8 

24958.6 

25052.4 

25146.2 

25240.1 

27000 

25333.9 

25427.7 

25521.6 

25615.4 

25709.2 

25803.1 

25896.9  25990.7 

26084.5 

26178.4 

2SOOO   26272.2 

26366.0 

26459.9 

26553.7  26647.5 

26741.3 

26835.2  26929.0 

27022.8 

27116.7 

Units. 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

Par.  Feet. 

Par.  Feet. 

Par.  Feet. 

Par.  Feet. 

Par.  Feet. 

Par.  Feet 

Par.  Feet. 

Par.  Feet. 

Par.  Feet. 

Par.  Feet. 

0 

0.00 

0.94 

1.88 

2.81 

3.75 

4.69 

5.63 

6.57 

7.51 

8.44 

10 

9.38 

10.32 

11.26 

12.20 

13.14 

14.07 

15.01 

15.95 

16.89 

17.83 

20 

18.77 

19.70 

20.64 

21.58 

22.52 

23.46 

24.40 

25.33 

26.27 

27.21 

30 

28.15 

29.09 

30.03 

30.96 

31.90 

32.84 

33.78 

34.72 

35.66 

36.59 

40 

37.53 

38.47 

39.41 

40.35 

41.28 

42.22 

43.16 

44.10 

45.04 

45.98 

50 

46.91 

47.85 

48.79 

49.73 

50.67 

51.61 

52.54 

53.48 

54.42 

55.36 

60 

56.30 

57.24 

58.17 

59.11 

60.05 

60.99 

61.93 

62.87 

63.80 

64.74 

70 

65.68 

66.62 

67.56 

68.50 

69.43 

70.37 

71.31 

72.25 

73.19 

74.13 

80 

.75.06 

76.00 

76.94 

77.88 

78.82 

79.75 

80.69 

81.63 

82.57 

83.51 

90 

84.45 

85.38 

86.32 

87.26 

88.20 

89.14 

90.08 

91.01 

91.95 

92.89 

D 


135 


XVIII.     CONVERSION    OF  ENGLISH    FEET    INTO  AMERICAN    FEET  AND    DECIMALS. 


1  English  Foot  =  0.99994197  American  Foot. 


Hundreds. 

Eng.  Feet. 
Thousands 

0. 

100. 

200. 

300. 

1OO. 

5OO. 

6OO. 

700. 

soo. 

900. 

Am  Feet 

Am.  Feet.  |  Am  Feet. 

Am  Feet 

Am.Feet. 

Am  Feet 

Am  Feet. 

Am.Feet. 

Am  Feet. 

Am  Feet 

0 

0.00 

99.99 

199.99 

299.98 

399.98 

499.97 

599.97 

699.96 

799.95 

899.95 

1000 

999.94 

1099.94 

1199.93 

1299.92 

1399.92 

1499.91 

1599.91 

1699.90 

1799.90 

1899.89 

2000 

1999.88 

2099.88 

2199.87 

2299.87 

2399.86 

2499.85 

2599.85 

2699.84 

2799.84 

2899.83 

3000 

2999.83 

3099.82 

3199.81 

3299.81 

3399.80 

3499.80 

3599.79 

3699.79 

3799.78 

3899.77 

4000 

3999.77 

4099.76 

4199.76 

4299.75 

4399.74 

4499.74 

4599.73 

4699.73 

4799.72 

4899.72 

5000 

4999.71 

5099.70 

5199.70 

5299.69 

5399.69 

5499.68 

5599.68 

5699.67 

5799.66 

5899.66 

6000 

5999.65 

6099.65 

6199.64 

6299.63 

6399.63 

6499.62 

6599.62 

6699.61 

6799.61 

6899.60 

7000 

6999.59 

7099.59 

7199.58 

7299.58 

7399.57 

7499.56 

7599.56 

7699.55 

7799.55 

7899.54 

8000 

7999.54 

8099.53 

8199.52 

8299.52 

8399.51 

8499.51 

8599.50 

8699.50 

B799.49 

8899.48 

9000 

8999.48 

9099.47 

9199.47 

9299.46 

9399.45 

9499.45 

9599.44 

9699.44 

9799.43 

9899.43 

10000 

9999.42 

10099.4 

10199.4 

10299.4 

10399.4 

10499.4 

10599.4 

10699.4 

10799.4 

10899.4 

11000 

10999.4 

11099.4 

11199.4 

11299.3 

11399.3 

11499.3 

11599.3 

11699.3 

11799.3 

11899.3 

12000 

11999.3 

12099.3 

12199.3 

12299.3 

12399.3 

12499.3 

12599.3 

12699.3 

12799.3 

12899.2 

13000 

12999.2 

13099.2 

13199.2 

13299.2 

13399.2 

13499.2 

13599.2 

13699.2 

13799.2 

13899.2 

14000 

13999.2 

14099.2 

14199.2 

14299.2 

14399.2 

14499.2 

14599.2 

14699.1 

14799.1 

14899.1 

15000 

14999.1 

15099.1 

15199.1 

15299.1 

15399.1 

15499.1 

15599.1 

15699.1 

15799.1  15899.1 

The  following  Table  of  Differences  between  English  and 

American  Feet,  for 

every  hundred  feet,  will  make 

it  easy 

to  convert  English  into  American  Feet,  or 

American  into  English  Feet,  by  adding  to,  or  subtracting 

from,  the  number  of 

feet  to  be  converted,  which  is  contained  in  the  first  column,  the  numbers  found 

in  the  other  columns. 

XIX.     DIFFERENCES    BETWEEN    ENGLISH    AND    AMERICAN    FEET. 

To  obtain  English  Feet  add. 

To  obtain  American  Feet  subtract. 

10000  American  Feet 

=  10000.5803  English  Feet. 

Number 

Hundreds. 

Number 

Hundreds. 

of  Feet. 

Of  Feet. 

Thou- 
sands. 

0. 

200. 

400. 

600. 

800. 

Thou- 
sands. 

0. 

2OO. 

400 

,  600. 

§00. 

Difffeet 

Diff.feet 

Difffeet 

Diff.feet. 

Difffeet 

Diff.feet. 

Diff.feet 

Diff.feet 

Difffeet.  Difffeet 

0 

±0.000 

±0.012 

±0.023 

±0.035 

±0.046 

15000 

±0.870 

±0.882 

±0.89- 

[  ±0.905  ±0.917 

1000 

0.058 

0.070 

0.082 

0.093 

0.105 

16000 

0.928 

0.940 

0.951 

•     0.963 

0.975 

2000 

0.116 

0.128 

0.139 

0.151 

0.162 

17000 

0.987 

0.998 

l.OK 

>     1.021 

.033 

3000 

0.174 

0.186 

0.197 

0.209 

0.221 

18000 

1.045 

1.056 

1.06£ 

!     1.079 

.091 

4000 

0.232 

0.244 

0.255 

0.267 

0.279 

19000 

1.103 

1.114 

1.126 

1     1.137 

.149 

5000 

0.290 

0.302 

0.313 

0.325 

0.337 

20000 

1.161 

1.172 

1.18-1 

1.195 

.207 

6000 

0.348 

0.360 

0.371 

0.383 

0.395 

21000 

1.219 

1.230 

1.242 

1.253 

.265 

7000 

0.406 

0.418 

0.429 

0.441 

0.453 

22000 

1.277 

1.288 

1.30C 

1.311 

.323 

8000 

0.464 

0.476 

0.487 

0.499 

0.511 

23000 

1.335 

1.346 

1.358 

1.370 

.381 

9000 

0.522 

0.534 

0.546 

0.557 

0.569 

24000 

1.393 

1.404 

1.416 

1.428 

.439 

10000 

0.580 

0.592 

0.604 

0.615 

0.627 

25000 

1.451 

1.462 

1.474 

.486 

.497 

11000 

0.638 

0.650 

0.662 

0.673 

0.685 

26000 

1.509 

1.520 

1.532 

.544 

.555 

12000 

0.696 

0.708 

0.720 

0.731 

0.743 

27000 

1.567 

1.578 

1.590 

.602 

.613 

13000 

0.754 

0.766 

0.778 

0.789 

0.801 

28000 

1.625 

1.636 

1.648 

.660 

.671 

14000 

0.812 

0.824 

0.836 

0.847 

0.859 

29000 

1.683 

1.694 

1.606 

.718 

1.729 

D 


136 


TO   CONVERT 
AMERICAN    YARDS    AND    FEET 

INTO   DIFFERENT  MEASURES   OF  LENGTH 


XX.    CONVERSION    OF    AMERICAN    YARDS    INTO    FRENCH    TOISES. 
1  American  Yard  =  0.4691736  Toise. 


Hundreds. 

Asnei'cat* 

Thousands. 

o. 

1OO. 

200. 

300. 

400. 

500.     600. 

700. 

8OO. 

9OO. 

Toises. 

Totes. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises 

Toises. 

Toises. 

["oises. 

0 

*  0.^0 

4S.9?. 

93.83 

140.75 

187.67 

234.59    281.50 

32842 

375.34 

422.26 

1000 

469.17 

516.09 

563.01 

609.93 

656.84 

703.76    750.68 

797.60 

844.51 

891.43 

2000 

938.35 

985.26 

M)32.18 

1079.10 

1126.02 

1172.93 

1219.85 

1266.77 

1313.69 

1360.60 

3000 

1407.52 

1454.44 

1501-36 

1548.27 

1595.19 

1642.11 

1689.02 

1735.94 

1782.86 

1829.78 

4000 

1876.69 

1923.61 

1970.53 

2917.45 

2064.36 

2111.28 

2158.20 

2205.12 

2252.03 

2298.95 

5000 

2345.87 

2392.79 

2439.70 

2486.62 

2533.54 

2580.45 

2627.37 

2674.29 

2721.21 

2768.12 

6000 

2815.04 

2861.96 

2908.88 

2955.79 

3002.71 

3049.63 

3096.55 

3143.46 

3190.38  3237.30J 

7000 

3284.22  3331.13 

3378.05  3424,97  1  3471.  88 

3518.80  3565.72 

3612.64 

3659.55  3706.47 

8000 

3753.39  3800.31 

3847.22  38U4.14 

S941.06 

3987.98  4034.89 

4081.81 

4128.73  4175.65 

9000 

4222.56  4269.48 

4316.40  4363.31 

4410.23 

4457.15  4504.07  4550.98  4597.90  4644.82 

XXI.     CONVERSION    OF  AMERICAN    YARDS    INTO    METRES. 

1  American  Yard  =  0.91443654  Metre. 

American 

Hundreds. 

Thousands. 

0. 

100. 

200. 

300. 

4OO. 

5OO. 

600. 

TOO. 

§OO.     9OO. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres.      Metres. 

Metres. 

Metres. 

Metres. 

0 

0.00 

91.44 

182.89 

274.33 

365.77 

457.22 

548.66 

640.11     731.55 

822.99 

1000 

914.44 

1005.88 

1097.32 

1188.77 

1280.21 

1371.65  1463.10 

1554.54  1645.99  1737.43 

2000 

1828.87 

1920.32 

2011.76 

2103.20 

2194.65 

2286.09  2377.54 

2468.98  2560.42  2651.87 

3000        2743.31 

2834.75 

2926.20 

3017.64 

3109.0S 

3200.53 

329  1  .97 

3383.42  '3474.86 

3566.30 

4000      ;  3657.75 

3749.19 

3840.63 

3932.08 

4023.52 

4114.96 

4206.41 

4297.85 

4389.30 

4480.74 

5000        4572.18 

4663.63 

4755.07 

4846.51 

4937.96 

5029.40 

5120.84 

5212.29 

5303.73 

5395.18 

6000 

5486.62 

5578.06 

5669.51 

5760.95 

5852.39 

5943.84 

6035.28 

6126.72  6218.17 

6309.61 

7000 

6401.06 

6492.50 

6583.94 

6675.39 

6766.83 

6858.27  6949.72 

7041.16'7132.61  7224.05 

8000 

7315.49 

7406.94 

7498.38 

7589.82 

7681.27 

7772.71  7864.15 

7955.60  8047.04  8138.49 

9000      IJ8229.93 

8321.37  8412.8218504.26 

8595.70 

8687.15  8778.59  8S70.03!8961.48  9052.92 

D 


137 


XXII.     CONVERSION    OF    AMERICAN    FEET    INTO    METRES. 
1  American  Foot  =  0.30481218  Metre. 


Hundreds. 

Amer  Feet. 

Thousands. 

0. 

100. 

200. 

300. 

400. 

500. 

600. 

700. 

§00. 

900.  i 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres.  I 

0 

0.00 

30.48 

60.96 

91.44 

121.92 

152.41 

182.89 

213.37 

243.85 

274.33  j 

1000 

304.81 

335.29 

365.77 

396.26 

426.74 

457.22 

487.70 

518.18 

548.66 

579.14  1 

2000 

609.62 

640.11 

670.59 

701.07 

731.55 

762.03 

792.51 

822.99 

853.47 

883.96 

3000 

914.44 

944.92 

975.40 

1005.88 

1036.36 

1066.84 

1097.32 

1127.81 

1158.29 

1188.77  i 

4000 

1219.25 

1249.73 

1280.21 

1310.69 

1341.17 

1371.65 

1402.14 

1432.62 

1463.10 

1493.58 

5000 

1524.08 

1554.54 

1585.02 

1615.50 

1645.99 

1676.47 

1706.95 

1737.43 

1767.91 

1798.39 

6000 

1828.87 

1859.35 

1889.84 

1910.32 

1940.80 

1971.28 

2001.76 

2032.24 

2062.72 

2093.20 

7000 

2123.69 

2154.17 

2184.65 

2225.13 

2255.61 

2286.09 

2316.57 

2347.05 

2377.54 

2408.02  ; 

8000 

2438.50 

2468.98 

2499.46 

2529.94 

2560.42 

2590.90 

2621.38 

2651.87 

2682.35 

2712.83 

9000 

2743.31 

2773.79 

2804.27 

2834.75 

2865.23 

2895.72 

2926.20 

2956.68 

2987.16 

3017.64 

10000 

3048.12 

3078.60 

3109.08 

3139.57 

3170.05 

3200.53 

3231.01 

3261.49 

3291.97 

3322.45 

11000 

3352.93 

3383.42 

3413.90 

3444.38 

3474.86 

3505.34 

3535.82 

3566.30 

3596.78 

3627.26 

12000 

3657.75 

3688.23 

3718.71 

3749.19 

3779.67 

3810.15 

3840.63 

3871.11 

3901.60 

3932.08 

13000 

3962.56 

3993.04 

4023.52 

4054.00 

4084.48 

4114.96 

4145.45 

4175.93 

4306.41 

4236.89 

14000 

4267.37 

4297.85 

4328.33 

4358.81 

4389.30 

4419.78 

4450.26 

4480.74 

4511.22 

4541.70 

15000 

4572.18 

4602.66 

4633.15 

4663.63 

4694.11 

4724.59 

4755.07 

4785.55 

4816.03 

4846.51 

16000 

4876.99 

4907.48 

4937.96 

4968.44 

4998.92 

5029.40 

5059.88 

5090.36 

5120.84 

5151.33 

17000 

5181.81 

5212.29 

5242.77 

5273.25 

5303.73 

5334.21 

5364.69 

5395.18 

5425.66 

5456.14 

18000 

5486.62 

5517.10 

5547.58 

5578.06 

5608.54 

5639.03 

5669.51 

5699.99 

5730.47 

5760.95 

19000 

5791.43 

5821.91 

5852.39 

5882.88 

5913.36 

5943.84 

5974.32 

6004.80 

6035.28 

6065.76 

20000 

6098.24 

6126.72 

6157.21 

6187.69 

6218.17 

6248.65 

6279.13 

6309.61 

6340.09 

6370.57 

21000 

6401.06 

6431.54 

6462.02 

6492.50 

6522.98 

6553.46 

6583.94 

6614.42 

6644.91 

6675.39 

22000 

6705.87 

6736.35 

6766.83 

6797.31 

6827.79 

6858.27 

6888.76 

6919.24 

6949.72 

6980.20 

23000 

7010.68 

7041.16 

7071.64 

7102.12 

7132.61 

7163.09 

7193.57 

7224.05 

7254.53 

7285.01 

24000 

7315.49 

7345.97 

7376.45 

7406.94 

7437.42 

7467.90 

7498.38 

7528.86 

7559.34 

7589.82 

25000 

7620.30 

7650.79 

7681.27 

7711.75 

7742.23 

7772.71 

7803.19 

7833.67 

7864.15 

7894.64 

26000 

7925.12 

7955.60 

7986.08 

8016.56 

8047.04 

8077.52 

8108.00 

8138.49 

8168.97 

8199.45 

27000 

8229.93 

8260.41 

8290.89 

8321.37 

8351.85 

8382.33 

8412.82 

8443.30  8473.78 

8504.26; 

28000 

8534.74 

8565.22 

8595.70 

8626.18 

8656.67 

8687.15 

8717.63 

8748.11  8778.59  8809.07 

Units. 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres 

Metres. 

Metres. 

0 

0.0000 

0.3048 

0.6096 

0.9144 

1.2192 

1.5241 

1.8289 

2.1337 

2.4385 

2.7433 

10 

3.0181 

3.3529 

3.6577 

3.9626 

4.2674 

4.5722 

4.8770 

5.1818 

5.4866 

5.7914 

20 

6.0962 

6.4011 

6.7059 

.7.0107 

7.3155 

7.6203 

7.9251 

8.2299 

8.5347 

8.8396 

30 

9.1444 

9.4492 

9.7540 

10.0588 

10.3636 

10.6684 

10.9732 

11.2781 

11.5829 

11.8877 

40 

12.1925 

12.4973 

12.8021 

13.1069 

13.4117 

13.7165 

14.0214 

14.3262 

14.6310 

14.9358 

50 

15.2406 

15.5454 

15.8502 

16.1550 

16.4599 

16.7647 

17.0695 

17.3743 

17.6791 

17.9839 

60 

18.2887 

18.5935 

18.8984 

19.1032 

19.4080 

19.7128 

20.0176 

20.3224 

20.6272 

20.9320 

70 

21.2369 

21.5417 

21.8465 

22.2513 

22.5561 

22.8609 

23.1657 

23.4705 

23.7754 

24.0802 

80 

24.3850 

24.6898 

24.9946 

25.2994 

25.6042 

25.9090 

26.2138 

26.5187 

26.8235 

27.1283 

90 

27.4331 

27.7379 

28.0427 

28.3475 

28.6523 

28.9572 

29.2620  29.5668 

29.8716 

30.1764 

D 


138 


XXIII.    CONVERSION    OF    AMERICAN    FEET    INTO    PARIS    OR    FRENCH    FEET. 
1  American  Foot  =  0.93834723  Paris  Foot. 


Hundreds. 

Amer.  Feet. 

Thousands. 

0. 

100. 

200. 

300. 

400. 

5OO. 

600. 

700. 

800. 

000. 

0 

Par.  Feet. 
0.0 

Par.Feet. 
93.8 

Par.  Feet. 
187.7 

Par.Feet. 
281.5 

Par.Feet. 
375.3 

Par.Feet. 
469.2 

Par.Feet. 
563.0 

Par.Feet. 
656.8 

Par.  Ret. 

750.7 

Par.Ftet. 
8J4.5 

1000 

933.3 

1032.2 

1126.0 

1219.9 

1313.7 

1407.5 

1501.4 

1595.2 

1689.0 

1782.9 

2000 

1876.7 

1970.5 

2064.4 

2158.2 

2252.0 

2345.9 

2439.7 

2533.5 

2627.4 

2721.2 

3000 

2S15.0 

2903.9 

3002.7 

3096.5 

3190.4 

3284.2 

3378.1 

3471.9 

3>b5.7 

3659.6 

4000 

3753.4 

3847.2 

3941.1 

4034.9 

4128.7 

4222.6 

4316.4 

4410.2 

4504.1 

4597.9 

5000 

4691.7 

4785.6 

4879.4 

4973.2 

5067.1 

5160.9 

5254.7 

5348.6 

5442.4 

5536  2 

6000 

5630.1 

5723.9 

5817.8 

5911.6 

6005.4 

6099.3 

6193.1 

6286.9 

6380.8 

6474.6 

7000 

6563.4 

6662.3 

6756.1 

6349.9 

6943.8 

7037.6 

7131.4 

7225.3 

7319.  r 

7412.9 

8000 

75Q6.8 

7600.6 

7694.4 

7788.3 

7882.1 

7976.0 

8069.8 

8163.6 

8257  5 

8351.3 

9000 

8445.1 

8539.0 

8632.8 

8726.6 

8820.5 

8914.3 

9003.1 

9102.0 

9195.8 

9289.6 

10000 

9383.5 

9477.3 

9571.1 

9665.0 

9758.8 

9852.6 

9946.5 

10040.3 

10134.2 

10228.0 

11000 

10321.8 

10415.7 

10509.5 

10603.3 

10697.2 

10791.0 

10834.8 

1097S.7 

11072.5 

11166.3 

12000 

11260.2 

11354.0 

11447.8 

11541.7 

11635.5 

11729.3 

11823.2 

11917.0 

12010.8 

12104.7 

13000 

1219S.5 

12292.3 

12386.2 

12480.0  12573.9 

12667.7 

12761.5 

12855.4 

12949.2 

13043.0 

14000 

13136.9 

13230.7 

13324.5 

13418.4 

13512.2 

13606.0 

13699.9 

13793.7 

13887.5 

13931.4 

15000 

14075.2 

14169.0 

14262.9 

14356.7 

14450.5 

14544.4 

14638.2 

14732.1 

14825.9 

14919.7 

16000 

15013.6 

15107.4 

15201.2 

15295.1 

15388.9 

15482.7  15576.6 

15670.4 

15764.2 

15858.1 

17000 

15951.9 

16045.7 

16139.6 

16233.4 

16327.2 

16421.1  16514.9 

16603.7 

16702.6 

16796.4 

18000 

16390.3 

16984.1 

17077.9 

17171.8 

17265.6 

17359.4  17453.3 

17547.1 

17640.9 

17734.8 

19000 

17828.6 

17922.4 

18016.3 

18110.1 

18203.9 

18297.8 

18391.6 

18485.4 

18579.3 

13673.1 

20000 

18766.9 

18860.8 

18954.6 

19048.4 

19142.3 

19236.1 

19330.0 

19423.8 

19517.6 

19611.5 

21000 

19705.3 

19799.1 

19893.0 

19936.8 

20080.6 

20174.5  20268.3  20362.1:20456.0 

20549.8 

22000 

20613.6  20737.5 

20831.3 

20925.1  21019.0 

21112.8  21206.6  21300.5  21:^94.3 

21488.2 

23000 

21582.0 

21675.8 

21769.7 

21863.5  21957.3 

22051.2  22145.0 

22238.8.  223H2.7 

22426.5 

24000 

22520.3 

22614.2 

22703.0 

22801.8 

22895.7 

22989.5 

23083.3 

23177.2 

23271.0 

23364.8 

25000 

23458.7 

23552.5 

23646.4 

23740.2 

23334.0 

23927.9 

24021.7 

24115.5 

24209.4 

24303.2 

26000 

24397.0 

24490.9 

24534.7;2  1678.5  24772.4 

24866.2  24960.0 

25053.9  25147.7 

23241.5 

27000 

25335.  4 

25429.2 

25523.0  25616.9 

25710.7 

2580  1.5  25893.4  25992.2I260S6.1 

26179.9 

2SOOO 

26273.7 

26367.6 

26461.4  26555.2 

26649.1 

26742.9  26836.7  26930.6  27024.4 

27118.2 

Units. 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Par  Feet 

Par  Feet. 

Par.Feet. 

Par  Feet 

Par.Feet. 

Par  Feet. 

Par.Feet. 

Par  Feet 

Par  Feet 

Par  Feet 

0 

0.00 

0.94 

1.88 

2.82 

3.75 

4.69 

5.63 

6.57 

7.51 

8.45 

10 

9.33 

10.32 

11.26 

12.20 

13.14 

14.08 

15.01 

15.95 

16.89 

17.83 

20 

18.77 

19.71 

20.64 

21.53 

22.52 

23.46 

24.40 

25.34 

26.27 

27.21 

30 

28.15 

29.09 

30.03 

30.97 

31.90 

32.84 

33.78 

34.72 

35.66 

36.60 

40 

37.53 

38.47 

39.41 

40.35 

41.29 

42.23 

43.16 

44.10 

45.04 

45.98 

.   50 

46.92 

47.86 

48.79 

49.73 

50.67 

51.61 

52.55 

53.49 

54.42 

55.36 

60 

56.30 

57.24 

58.18 

59.12 

60.05 

60.99 

61.93 

62.87 

63.81 

64.75 

70 

65.63 

66.62 

67.56 

68.50 

69.44 

70.38 

71.31 

72.25 

73.19 

74.13 

80 

75.07 

76.01 

76.94 

77.88 

78.82 

79.76 

80.70 

81.64 

82.57 

83.51 

90 

84.45 

85.39 

86.33 

87.27 

88.20 

89.14 

90.08 

91.02 

91.96 

92.90 

D 


139 


TO    CONVERT 
KLAFTER,    AND    FEET    OF    VIENNA 

INTO  DIFFERENT  MEASURES   OF  LENGTH. 
1    KLAFTER    OF    VIENNA  =  6    FEET    OF    VIENNA  ^=  840.76134    FRENCH    OR   PARIS    LINES. 

From  this  value  are  derived  the  equations  used  in  computing  the  following  tables. 


XXIV.     CONVERSION    OF    KLAFTER    OF    VIENNA    INTO    FRENCH    TOISES. 
1  Klafter  =  0.9731034  Toise. 


Units. 

Klafter  of 
Vienna 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

i 

Toises. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises 

Toises. 

Toises. 

0 

0.000 

0.973 

1.916 

2.919 

3.892 

4.866 

5.839 

6.812 

7-785 

8.758 

10 

9.731 

10.704 

11.677 

12.650 

13.623 

14.597 

15.570 

16.543 

17.516 

18.489 

20 

19.462 

20.435 

21.408 

22.381 

23.354 

24.328 

25.301 

26.274 

27.247 

28.220 

30 

29.193 

30.166 

31.139 

32.112 

33.086 

34.059 

35.032 

36.005 

36.978 

37.951 

40 

38.924 

39.897 

40.870 

41.843 

42.817 

43.790 

44.763 

45.736 

46.709 

47.682 

50 

48.655 

49.628 

50.601 

51.574 

52.548 

53.521 

54.494 

55.467 

56.440 

57.413 

60 

58.386 

59.359 

60.332 

61.306 

62.279 

63.252 

64.225 

65.198 

66.171 

67.144 

70 

68.117 

69.090 

70.063 

71.037 

72.010 

72.983 

73.956 

74.929 

75.902 

76.875 

80 

77.848 

78.821 

79.794 

80.768 

81.741 

82.714 

83.687 

84.660 

85.633 

86.606 

90 

87.579 

88.552 

89.526 

90.499 

91.472 

92.445 

93.418 

94.391 

95.364 

96.337 

Hundreds. 

Klafter. 

Thousands. 

0. 

100. 

200. 

300. 

400. 

500. 

GOO. 

TOO. 

800. 

900. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises. 

Toises. 

0 

0.00 

97.31 

194.62 

291.93 

389.24 

486.55 

583.86 

681.17 

778.48 

875.79 

1000 

973.10 

1070.41 

1167.72 

1265.03 

1362.34 

1459.65 

1556.97 

1654.28 

1751.59 

1848.90 

2000 

1946.21 

2043.52 

2140.83 

2238.14 

2335.45 

2432.76  !  2530.07 

2627.38 

2724.69 

2822.00 

3000 

2919.31 

3016.62 

3113.93 

3211.24 

3308.55 

3405.86  3503.17 

3600.48 

3797.79 

3795.10 

4000 

3892.41 

3989.72 

4087.03 

4184.34 

4281.65 

4378.97  4476.28 

4573.59 

4670.90 

4768.21 

5000 

4865.52 

4962.83 

5060.14 

5157.45 

5254.76 

5352.07;  5449.38 

5546.69 

5644.00  5741.31 

D 


140 


XXV.     CONVERSION    OF    KLAFTER    OF    VIENNA    INTO    METRES. 
1  Klafter  =  1.8966U2  Metre. 


Klafter  of 

Klafter.     Units. 

Tens. 

O. 

1. 

2. 

3.          4. 

5. 

6. 

7. 

8. 

9. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

0 

0.000 

1.897 

3.793 

5.690 

7.586 

9.483 

11.38C 

13.276 

15.173 

17.070 

10 

18.966 

20.863 

22.759 

24.656 

26.553 

28.449 

30.346 

32.242 

34.139 

36.036  j 

20 

37.932 

39.829 

41.726 

43.622 

45.519 

47.415 

49.312 

51.209 

53.105 

55.002  i 

30 

56.898 

58.795 

60.692 

62.588 

64.485 

66.381 

68.278 

70.175 

72.071 

73.968  j 

40 

75.865 

77.761 

79.658 

81.554 

83.451 

85.348 

87.244 

89.141 

91.037 

92.934 

50 

94.831 

96.727 

98.624 

100.521 

102.417 

104.314 

106.210 

108.107 

110.004 

111.900 

60 

113.797 

115.693 

117.590J  119.487 

121.383 

123.280  125.177 

127.073 

128.970 

130.866  I 

70 

132.763 

134.660 

136.556 

138.453 

140.349 

142.246  144.143 

146.039 

147.936  149.833 

80 

151.729 

153.626 

155.522 

157.419 

159.316 

161.212  163.109 

165.005 

166.902 

168.799 

90 

170.695  j  172.592  174.489  176.385 

178.282 

180.178  182.075 

183.972 

185.868 

187.765 

Klafter. 

Hundreds. 

Thousands. 

0. 

100.     200. 

300.    400. 

5OO. 

600. 

700. 

§OO. 

900. 

Metres. 

Metres.      Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres 

Metres. 

Metres. 

0 

0.00 

189.66  !   379.32 

568.93 

758.65 

948.31 

1137.97 

1327.63 

1517.29 

1706.95 

1000 

1896.61 

2086.28  2275.94 

2465.60 

2655.26 

2844.92 

3034.58 

3224.24 

3413.91 

3603.5V 

2000 

3793.23 

3982.89  4172.55 

4362.21 

4551.87 

4741.54 

4931.20 

5120.86 

5310.52 

5500.18 

3000 

5689.84 

5879.50  6069.17 

6258.83  6448.49 

6638.15 

6827.81 

7017.47 

7207.13 

7396.80 

4000 

7586.46 

7776.12  7965.78 

8155.44  8345.10 

8534.76 

8724.43  8914.09 

9103.75 

9293.41 

XXVI.     CONVERSION    OF    KLAFTER    OF    VIENNA    INTO    PARIS    OR    FRENCH    FEET. 

1  Klafter  =  5.8386204  Paris  or  French  Feet. 

Klafter.     Units. 

Klafter  of 

Vienna. 

Tens. 

0. 

1. 

2.          3.          4. 

5. 

6. 

7. 

8. 

9. 

Par.Feet. 

Par.Feet. 

Par.Feet.  Par.Feet. 

Par.Feet. 

Par.Feet. 

Par.Feet. 

Par.Feet. 

Par.Feet. 

Par.Feet. 

o 

0.00 

5.84 

11.68 

17.52 

23.35 

29.19 

35.03 

40.87 

46.71 

52.55 

10 

58.39 

64.22 

70.06 

75.90 

81.74 

87.58 

93.42 

99.26 

105.10 

110.93 

20 

116.77 

122.61 

128.45 

134.29 

140.13 

145.97 

151.80 

157.64 

163.48 

169.32 

30 

175.16 

181.00 

186.84 

192.67 

198.51 

204.35 

210.19 

216.03 

221.87 

227.71 

40 

233.54 

239.38 

245.22  !  251.06 

256.90 

262.74 

268.58 

274.42 

280.25 

286.09 

50 

291.93 

297.77 

303.61 

309.45 

315.29 

321.12 

326.96 

332.80 

328.64 

344.48 

60 

350.32 

356.16 

361.99 

367.83 

373.67 

379.51 

385.35 

391.19 

397.03 

402.86 

70 

408.70 

414.54 

420.38 

426.22 

432.06 

437.90 

443.74 

449.57 

455.41 

461.25 

80 

467.09 

472.93 

478.77 

484.61 

490.44 

496.28 

502.12 

507.96 

513.80 

519.64 

90           525.48 

531.31 

537.15 

542.99 

548.83 

554.67 

560.51 

566.35 

572.18 

578.02 

Hundreds. 

Klafter. 

Thousands 

0. 

100. 

200. 

300. 

400. 

500. 

600. 

700. 

800. 

9OO. 

;  Par.Feet. 

Par.Feet. 

Par  Feet. 

Par.Feet 

Par.Feet. 

Par  Feet. 

Par.Feet. 

Par  Feet. 

Par.Feet 

Par.Feet 

0              0.00    583.86 

1167.72 

1751.59 

2335.45 

2919.31 

3503.17 

4087.03 

4670.90 

5254.76 

1000        5838.62  6422.48 

7006.34 

7590.21 

8174.07 

8757.93 

9341.79 

9925.65 

10509.5 

11093.4 

2000       |  11677.2  12261.1 

12845.0 

13428.8 

14012.7 

14596.6 

15180.4 

15764.3 

16348.1 

16932.0 

3000        17515.9  18099.7 

18683.6 

19267.4 

19851.3 

20435.2 

21019.0 

21602.9 

22186.8 

22770.6 

4000         23354.5  23938.3 

<54522.2 

25106.1;  25689.9 

26273.8  26857.7 

27441.5 

28025.4 

28609.2 

D 


141 


XXVII.     CONVERSION    OF    KLAFTER    OF    VIENNA    INTO    ENGLISH    FEET. 

1  Klafter  =  6  22260  English  Feet. 


Klafter  of 

Vienna 

Tens. 

Klafter.    Units. 

0. 

1. 

2. 

3. 

4. 

5.          6. 

y. 

§. 

9. 

Eng  feet. 
56  00 

0 

Eng.  feet. 
0.00 

Eng  feet. 
6.22 

Eng.  feet. 
12.45 

Eng.  feet. 
18.67 

Eng.  feet. 
24.89 

Eng.  feet 
31.11 

Eng  feet. 
37.34 

Eng.  feet. 
43.56 

Eng.  feet. 
49.78 

10 

62.23 

63.45 

74.67 

80.89 

87.12 

93.34 

99.56 

105.78 

112.01 

118.23 

20 

121.45 

130.67 

136.90 

143.12 

149.34 

155.56 

161.79 

168.01 

174.23 

180.46 

80 

186.63 

192.90 

199.12 

205.35 

211.57 

217.79 

224.01 

230.24 

236.46 

242.68 

40 

248.90 

255.13 

261.35 

267.57 

273.79 

280.02 

286.24 

292.46 

298.68 

304.91 

50 

311.13 

317.35 

323.58 

329.80 

336.02 

342.24 

348.47 

354.69 

360.91 

367.13 

60 

373.36 

379.58 

385.80 

392.02 

398.35 

404.47 

410.69 

416.91 

423.14 

429.36 

70 

435.58 

441.80 

448.03 

454.25 

480.47 

466.69 

472.92 

479.14 

485.36 

491.59 

80 

497.81 

504.03 

510.25 

516.48 

522.70 

528.92 

535.14 

541.37 

547.59 

553.81 

90 

560.03 

566.26 

572.48 

578.70 

584.92 

591.15 

597.37 

603.59 

609.81 

616.04 

Klafter. 
Thousands 

Hundreds. 

o. 

1OO. 

2OO. 

300. 

400. 

5OO. 

6OO. 

7OO. 

§OO. 

000. 

0 

Eng.  feet. 
0.00 

Eng.  feet.  Eng.  feet. 
622.26  1244.52 

Eng.  feet. 
1866.78 

Eng  feet. 
2189.04 

Eng.  feet. 
3111.30 

Eng.  feet. 
3733.56 

Eng.  feet. 
4355.82 

Eng.  feet 
4978.08 

Eng  feet 
5600.34 

1000 

6222.60 

6844.86 

7467.12 

8089.38 

8711.64 

9333.90 

9956.16 

10578.4 

11200.7 

11822.9 

2000 

12445.2 

13067.5 

13689.7 

14312.0 

14934.2 

15556.5 

16178.8 

16801.0 

17423.3 

18045.5 

3000 

1S667.8 

19290.1 

19912.3 

20534.6 

21156.8 

21779.1 

22401.4 

23023.6 

23645.9 

24268.1 

4000 

24890-4 

25512.7 

26134.9 

26757.2 

27379.4 

28001.7 

28624.0 

29246.2 

3986S.5 

30490.7 

XXVIII.     CONVERSION    OF   FEET    OF    VIENNA    INTO    METRES. 

1  Foot  of  Vienna  =  0.3161024  Metre. 

Feet  of 
Vienna. 

Thousands 

Hundreds. 

0. 

100. 

200. 

300. 

400. 

500. 

600. 

700. 

§OO. 

ooo. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

0 

0.00 

31.61 

63.22 

94.83 

126.44 

158.05 

189.66 

221.27 

252.88 

284.49 

1000 

316.10 

347.71 

379.32 

410.93 

442.54 

474.15 

505.76 

537.37 

568.98 

600.59 

2000 

632.20 

663.82 

695.43 

727.04 

758.65 

790.26 

821.87 

853.48 

885.09 

916.70 

3000 

948.31 

979.92 

1011.53 

1043.14 

1074.75 

1106.36 

1137.97 

1169.58 

1201.19 

1232.80 

4000 

1264.41 

1296.02 

1327.63 

1359.24 

1390.85 

1422.46 

1454.07 

1485.68 

1517.29 

1548.90 

5000 
6000 

1580.51 
1896.61 

1612.12 
1928.22 

1643.73 
1959.83 

1675.34 
1991.45 

1706.95 
2023.06 

1738.56 
2054.67 

1770.17 
2086.28 

1801.78 
2117.89 

1833.39 

2149.50 

^865.00 
2181.11 

7000 

2212.72 

2244.33 

2275.94 

2307.55 

2339.16 

2370.77 

2402.38 

2433.99 

2465.60  2497.21 

8000 

2528.82 

2560.43 

2592.04 

2623.65 

2655.26 

2686.87 

2718.48 

2750.09  27S1.70;2813.31 

9000 

2844.92 

2876.53 

2908.14 

2939.75 

2971.36 

3002.97 

3034.58 

3066.19 

3097.80 

3129.41 

10000 

3161.02 

3192.63 

3224.24 

3255.85 

3287.46 

3319.08 

3350.69 

3382.30 

3413.91 

3445.52 

11000 
12000 
13000 

3477.13 
3793.23 
4109.33 

3508.74 
3824.84 
4140.94 

3540.35 
3856.45 
4172.55 

3571.96 
3888.06 
4204.16 

3603.57 
3919.67 
4235.77 

3635.18 
3951.28 
4267.38 

3666.79  3698.40  3730.01 
3982.89  4014.50  4046.11 
4298.99  4330.60  4362.21 

3761.62 

4077.72 
4393.82 

14000 

4425.43 

4457.04 

4488.65 

4520.26 

4551.87 

4583.48 

4615.10  4646.71  4678.32  1709.93 

15000 

4741.54 

4773.15 

4804.76 

4836.37 

4867.98 

4899.59 

4931.20  4962.81  4994.42  5026.03 

D 


142 


XXIX.    CONVERSION  OF  FEET  OF  VIENNA  INTO  PARIS  OR  FRENCH  FEET  AND  DECIMALS. 
1  Foot  of  Vienna  =  0.9731034  Paris  Foot. 


Hundreds. 

Feet  of 

Vienna. 

Thousands. 

0. 

100. 

200. 

300. 

400. 

500. 

600. 

TOO. 

$00. 

900. 

0 

Par.Feet. 
0.0 

Par.Feet. 
97.3 

Par.Feet.  Par.Feet. 
194.6      291.9 

Par.Feet. 
389.2 

Par.Feet. 
486.6 

Par.Feet. 
583.9 

Par.Feet. 
681.2 

Par.Feet. 
778.5 

Par.Feet. 
875.8 

1000 

973.1 

1070.4 

1167.7 

1265.0 

1362.3 

1459.7 

1557.0 

1654.3 

1751.6 

1848.9 

2000 

1946.2 

2043.5 

2140.8 

2238.1 

2335.4 

2432.8 

2530.1 

2627.4 

2724.7 

2822.0 

3000 

2919.3 

3016.6 

3113.9 

3211.2 

3308.6 

3405.9 

3503.2 

3600.5 

3697.8 

3795.1 

4000 

3892.4 

3889.7 

4087.0 

4184.3 

4281.7 

4379.0 

4476.3 

4573.6 

4670.9 

4768.2 

5000 

4865.5 

4962.8 

5060.1 

5157.4 

5254.8 

5352.1 

5449.4 

5546.7 

5644.0 

5741.3 

6000 

5838.6 

5935.9 

6033.2 

6130.6 

6227.9 

6325.2 

6422.5 

6519.8 

6617.1 

6714.4 

7000 

6S11.7 

6909.0 

7006.3 

7103.7 

7201.0 

7298.3 

7395.6 

7492.9 

7590.2 

7687.5 

8000 

7784.8 

7882.1 

7979.4 

8076.8 

8174.1 

8271.4 

8368.7 

8466.0 

8563.3 

8660.6 

9000 

8757.9 

8855.2 

8952.6 

9049.9 

9147.2 

9244.5 

9341.8 

9439.1 

9536.4 

9633.7 

10000 

9731.0 

9828.3 

9925.7 

10023.0 

10120.3 

10217.6 

10314.9 

10412.2 

10509.5 

10606.8 

11000 

10704.1 

10801.4 

10898.8 

10996.1 

11093.4 

11190.7 

11288.0 

11385.3 

11482.6 

11579.9 

12000 

11677.2 

11774.6  11871.9 

11969.2 

12066.5 

12163.8 

12261.1  12358.4 

12455.7 

12553.0 

13000 

12650.3 

12747.7  12845.0 

12942.3 

13039.6 

13136.9 

13234.2  13331.5 

13438.8 

13526.1 

14000 

13623.4 

13720.8  13818.1 

13915.4 

14012.7 

14110.0 

14207.3  14304.6 

14401.9 

14499.2 

15000 

14596.6 

14693.9  14791.2 

14888.5 

14985.8 

15083.1 

15180.4  15277.7 

15375.0 

15472.3 

16000 

15569.7 

15667.0  15764.3 

15861.6 

15958.9 

16056.2 

16153.5,16250.8 

16348.1 

16445.4 

XXX.    CONVERSION    OF    FEET    OF    VIENNA    INTO    ENGLISH    FEET    AND    DECIMALS. 

1  Foot  of  Vienna  =  1.03710  English  Foot. 

Hundreds. 

Feet  of 

Vienna. 
Thousands. 

0. 

100. 

200. 

300. 

400. 

500. 

6OO. 

TOO: 

soo. 

900. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet 

Eng.  feet. 

0 

0.0 

103.7 

207.4 

311.1 

414.8 

518.5 

622.3 

726.0 

829.7 

933.4 

1000 

1037.1 

1140.8 

1244.5 

1348.2 

145.1.9 

1555.6 

1659.4 

1763.1 

1866.8 

1970.5 

2000 

2074.2 

2177.9 

2281.6 

2385.3 

2489.0 

2592.7 

2696.5 

2800.2 

2903.9 

3007.6 

3000 

3111.3 

3215.0 

3318.7 

3422.4 

3526.1 

3629.8 

3733.6 

3837.3 

3941.0 

4044.7 

4000 

4148.4 

4252.1 

4355.8 

4459.5 

4563.2 

4666.9 

4770.7 

4874.4 

4978.1 

5081.8 

5000 

5185.5 

5289.2 

5392.9 

5496.6 

5600.3 

5704.0 

5807.8 

5911.5 

6015.2 

6118.9 

6000 

6222.6 

6326.3 

6430.0 

6533.7 

6637.4 

6741.1 

6844.9 

6948.6 

7052.3 

7156.0 

7000 

7259.7 

7363.4 

7467.1 

7570.8 

7674.5 

7778.2 

7882.0 

7985.7 

8089.4 

8193.1 

8000 

8296.8 

8400.5 

8504.2 

8607.9 

8711.6 

8815.3 

8919.1 

9022.8 

9126.5 

9230.2 

9000 

9333.9 

9437.6 

9541.3 

9645.0 

9748.7 

9852.4 

9956.2 

10059.9 

10163.6 

10267.3 

10000 

10371.0 

10474.7 

10578.4 

10682.1 

10785.8 

10889.5 

10993.3 

11097.0 

11200.7 

11304.4 

11000 

11408.1 

11511.8 

11615.5 

11719.2 

11822.9 

11926.6 

12030.4 

12134.1 

12297.8 

12341.5 

12000 

12445.2 

12548.9 

12652.6 

12756.3 

12860.0 

12963.8 

13067.5 

13171.2 

13274.9 

13378.6 

13000 

13482.3 

13586.0 

13689.7  13793.4 

13897.1 

14000.9 

14104.6 

14208.3 

14312.0 

14415.7 

14000 

14519.4 

14623.1 

14726.8  14830.5 

14934.2 

15038.0 

15141.7 

15245.4 

15349.1 

15452.8 

15000 

15556.5 

15660.2 

15763.9  15867.6 

15971.3 

16075.0 

16178.8 

16282.5 

16386.2 

16489.9 

16000 

16593.6 

16697.3 

16801.0  16904.7 

17008.4 

17112.1 

17215.9 

17319.6 

17423.3 

17527.0 

D 


143 


TO  CONVERT 
RHINE     OR    PRUSSIAN    FEET 

INTO  DIFFERENT  MEASURES  OF  LENGTH. 

The  Rhine  Foot  is  used  in  Physical  Geography,  though  not  so  extensively  as  the 
French  or.  Paris  Foot,  in  the  northwestern  part  of  Germany,  Denmark,  and  Holland. 
Its  legal  value  in  the  Prussian  system  of  weights  and  measures  is  139.13  French  or 
Paris  Lines,  from  which  are  derived  the  equations  used  in  computing  the  follow- 
ing tables. 


XXXI.     CONVERSION    OF    RHINE    OR   PRUSSIAN    FEET    INTO    FRENCH    TOISES. 
1  Rhine  Foot  =  0.1610301  Toise. 


Hundreds. 

Rhine  Feet. 

Thousands. 

0. 

100. 

200. 

300. 

4OO. 

5OO. 

600. 

700. 

800. 

900. 

0 

Toises. 
0.00 

Toises. 
16.10 

Toises. 
32.21 

Toises. 
48.31 

Toises. 
64.41 

Toises. 
80.52 

Toises. 
96.62 

Toises. 
112.72 

Toises. 
128.82 

Toises. 
144.93 

1000 

161.03 

177.13 

193.24 

209.34 

225.44 

241.55 

257.65 

273.75 

289.85 

305.96 

2000 

322.06 

338.16 

354.27 

370.37 

386.47 

402.58 

418.68 

434.78 

450.88 

466.99 

3000 

483.09 

499.19 

515.30 

531.40 

547.50 

563.61 

579.71 

595.81 

611.91 

628.02 

4000 

634.12 

650.22 

666.33 

692.43 

608.53 

724.64 

740.74 

756.84 

772.94 

789.05 

5000 

805.15 

821.25 

837.36 

853.46 

869.56 

885.67 

901.77 

917.87 

933.97 

950.08 

6000 

966.18 

982.28 

998.39 

1014.49 

1030.59 

1046.70 

1062.80 

1078.90 

1095.00 

1111.11 

7000 

1127.21 

1143.31 

1159.42 

1175.52 

1191.62 

1207.73 

1223.83 

1239.93 

1256.03 

1272.14 

8000 

1288.24 

1304.34 

1320.45 

1336.55 

1352.65 

1368.76 

1384.86 

1400.96 

1417.06  1433.  17|| 

9000 

1449.27 

1465.37 

1481.48 

1497.58 

1513.68 

1529.79 

1545.89 

1561.99 

1578.09 

1594.20 

XXXII.       CONVERSION    OF    RHINE    OR    PRUSSIAN    FEET    INTO    METRES. 
1  Rhine  Foot  =  0.31385354  Metre. 


Rhine  Feet. 

Rhine  Feet.    Hundreds. 

Thousands. 

0. 

100. 

200. 

3OO. 

4OO. 

500. 

600. 

700. 

800. 

900. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

0 

0.00 

31.39 

62.77 

94.16 

125.54 

156.93 

188.31 

219.70 

251.08 

282.47 

1000 

313.85 

345.24 

376.62 

408.01 

439.39 

470.78 

502.17 

533.55 

564.94 

596.32 

2000 

627.71 

659.09 

690.48 

721.86 

753.25 

784.63 

816.02 

847.40 

878.79 

910.18 

3000 

941.56 

972.95 

1004.33 

1035.72 

1067.10 

1098.49 

1129.87 

1161.26 

1192.64 

1224.03 

4000 

1255.41 

1286.80 

1318.18 

1349.57 

1380.96 

1412.34 

1443.73 

1475.11 

1506.50 

1537.88 

5000 

1569.27 

1600.65 

1632.04 

1663.42 

1694.81 

1726.19 

1757.58 

1788.97 

1820.35 

1851.74 

6000 

1883.12 

1914.51 

1945.89 

1977.28 

2008.66 

2040.05 

2071.43 

2102.82 

2134.20 

2165.59 

7000 

2196.97 

2228.36  2259.75 

2291.13 

2322.52 

2353.90 

2385.29 

2416.67 

2448.06 

2479.44 

8000 

2510.83 

2542.21  2573.60 

2604.98 

2636.37 

2667.76 

2699.14 

2730.53 

2761.91 

2793.30 

9000 

2824.68 

2856.07 

28S7.45 

2918.84 

2950.22 

2981.61 

3012.99 

3044.38 

3075.76 

3107.15 

XXXIII.       OF     RHINE    OR    PRUSSIAN    FEET    INTO    FRENCH    FEET  AND    DECIMALS. 

1  Rhine  Foot  =  0  96618056  French  Foot. 

Rhine  Feet.    Hundreds. 

Rhine  Feet. 

Thousands. 

o. 

too. 

2OO.     3OO. 

1OO. 

500. 

600. 

TOO. 

soo. 

9OO. 

Fr.Feet. 

Fr  Feet. 

Fr.Feet 

Fr.Feet. 

Fr.Feet. 

Fr.Feet. 

Fr.Feet. 

Fr.Feet. 

Fr.Feet. 

Fr.Feet. 

0 

0.00 

96.62 

193.24 

289.85    386.47 

483.09 

579.71 

676.33 

772.94 

869.56 

1000 

966.18 

1062.80 

1159.42 

1256.03 

1352.65 

1449.27 

1545.89 

1642.51 

1739.13 

1835.74 

2000 

1932.36 

2028.98  2125.60 

2222.22 

2318.83 

2415.45 

2512.07 

2608.69 

2705.31 

2801.92 

3000 

2898.54 

2995.16  3091.78 

3188.40 

3285.01 

3381.63 

3478.25 

3574.87 

3671.49 

3768.10 

4000 

3864.72 

3961.34|4057.96 

4154.58 

4251.19 

4347.81 

4444.43 

4541.05 

4637.67 

4734.28 

5000 

4830.90 

4927.52  5024.14 

5120.76 

5217.38 

5313.99 

5410.61 

5507.23 

5603.85 

5700.47 

1 

1 

6000 

5797.08 

5893.70^990.32 

6086.9416183.56 

6280.17 

6376.79 

6473.41 

6570.03 

6666.65 

7000 

6763.26 

6859.88  6956.50 

7053.12  7149.74 

7246.35 

7342.97 

7439.59 

7536.21 

7632.83 

8000 

7729.44 

7826.06  7922.68  8019.30  8115.92 

8212.53 

8309.15 

8405.77 

8502.39 

8599.01 

9000 

8695.63  8792.24J8888.86  8985.48  19082.10 

9178.72 

9275.33  9371.95 

9468.57 

9565.19 

XXXIV.       OF    RHINE    OR    PRUSSIAN    FEET    INTO    ENGLISH  FEET  AND  DECIMALS, 

1  Rhine  Foot  =  1  0297218  English  Foot. 

Rhine  Feet. 

Rhine  Feet.     Hundreds. 

Thousands. 

0. 

100. 

2OO. 

300. 

400. 

500. 

6OO. 

700. 

800. 

900. 

Eng.  feet. 

Eng.  feet.  1  Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet.  Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

0 

0.00 

102.97 

205.94 

308.92 

411.89 

514.86 

617.83    720.81 

823.78 

926.75 

1000 

1029.72 

1132.69 

1235.67 

1338.64 

1441.61 

1544.58 

1647.55  1  1750.53 

1853.50 

1956.47 

2000 

2059.44 

2162.42 

2265.39 

2368.36 

2471.33 

2574.30 

2677.28 

2780.25 

2883.22 

2986.19 

3000 

3089.17 

3192.14 

3295.11 

3398.08 

3501.05 

3604.03 

3707.00 

3809.97 

3912.94 

4015.92 

4000 

4118.89 

4221.86 

4324.83 

4427.80 

4530.78 

4633.75 

4736.72 

4839.69 

4942.66 

5045.64 

5000 

5148.61 

5251.58 

5354.55 

5457.53 

5560.50 

5663.47 

5766.44 

5869.41 

5972.39 

6075.36 

6000 

6178.33 

6281.30 

6384.28 

6487.25 

6590.22 

6693.19  6796.16  6899.14 

7002.11 

7105.08 

7000 

7208.05 

7311.02 

7414.00 

7516.97 

7619.94 

7722.91  7825.89  7928.86  8031.83 

8134.80 

8000 

8237.77 

8340.75 

8443.72 

8546.69 

8649.66 

8752.64  8855.61  8958.5819061.55 

9164.52 

9000 

9267.50 

9370.47  9473.44  9576.41 

9679.38 

9782.36  9885.33  '9988.30  10091.3 

10194.2 

D 


145 


TO   CONVERT 
SPANISH    OR    MEXICAN    VARAS    AND    FEET 

INTO  DIFFERENT   MEASURES   OF  LENGTH. 


XXXV.     CONVERSION    OF    SPANISH    OR    MEXICAN    VARAS    INTO    METRES. 
1  Yara  =  0.847965  Metre. 


Hundreds. 

Varas. 

Thousands. 

0. 

100. 

200. 

300. 

400. 

500. 

600. 

•700. 

800. 

900* 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

0 

0.00 

84.80 

169.59 

254.39 

339.19 

423.98 

508.78 

593.58 

678.37 

763.17 

1000 

847.96 

932.76 

1017.56 

1102.35 

1187.15 

1271.95 

1356.74 

1441.54 

1526.34 

1611.13 

2000 

1695.93 

1780.73 

1865.52 

1950.32 

2035.12 

2119.91 

2204.71 

2289.51 

2374.30  2459.10 

3000 

2543.89 

2628.69 

2713.49 

2798.28 

2883.08 

2967.88 

3052.67 

3137.47 

3222.27  3307.06 

4000 

3391.86 

3476.66 

3561.45 

3646.25 

3731.05 

3815.84 

3900.64 

3985.44 

4070.23 

4155.03 

5000 

4239.82 

4324.62 

4409.42 

4494.21 

4579.01 

4663.81 

4748.60 

4833.40 

4918.20 

5002.99 

6000 

5087.79 

5172.59 

5257.38 

5342.18 

5426.98 

5511.77 

5596.57 

5681.37 

5766.16  5850.96 

7000 

5935.75 

6020.55 

6105.35 

6190.14 

6274.94 

6359.74 

6444.53  6529.33 

6614.13  669S.92 

8000 

6783.72 

6868.52 

6953.31 

7038.11 

7122.91 

7207.70 

7292.50  7377.30 

7462.09  7546.89 

9000 

7631.68  7716.48 

7801.28  J7886.07 

7970.87 

8055.67 

8140.46;8225.26 

8310.06  8394.85 

XXXVI.     OF    SPANISH    OR    MEXICAN  VARAS  INTO  ENGLISH  FEET  AND  DECIMALS. 

1  Vara  =  2.78209  English  Feet. 

Hundreds. 

Varas. 

Thousands. 

0. 

100. 

200. 

300. 

4OO. 

500. 

600. 

700. 

800. 

900. 

Eng.feet. 

Eng.  feet 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.  feet. 

Eng.feet.  Eng.feet. 

Eng.  feet. 

0 

0.0 

278.2 

556.4 

834.6 

1112.8 

1391.0 

1669.3 

1947.5 

2225.7 

2503.9 

1000 

2782.1 

3060.3 

3338.5 

3616.7 

3894.9 

4173.1 

4451.3 

4729.6 

5007.8 

5286.0 

2000 

5564.2 

5842.4 

6120.6 

6398.8 

6677.0 

6955.2 

7233.4 

7511.6 

7789.9 

8068.1 

3000 

83463 

8624.5 

8902.7 

91S0.9 

9459.1 

9737.3 

10015.5 

10293.7 

10571.9 

10850.2 

4000 

11128.4 

If  406.  6 

11684.8 

11963.0 

12241.2 

12519.4 

12797.6 

13075.8 

13354.0 

13632.2 

5000 

13910.4 

14188.7 

14466.9 

14745.1 

15023.3 

15301.5 

15579.7 

15857.9 

16136.1 

16414.3 

6000 

16692.5 

16970.7 

17249.0 

17527.2 

17805.4 

18083.6 

18361.8 

18640.0  18918.2  19196.4 

7000 

19474.6 

19752.8 

20031.0 

20309.3 

20587.5 

20865.7 

21143.9 

21422.1  21700.3  21978.5 

8000 

22256.7 

22534.9 

22813.1 

23091.3 

23369-6 

23647.8 

23926.0  24204.2  24482.4  24760.6 

9000 

25038.8 

25317.0 

25595.2 

25873.4 

26151.6 

26429.9  j 

2670S.1 

26986.3  27164.5:27442.7 

D 


146 


XXXVII.     CONVERSION    OF    CASTILIAN    FEET    INTO    METRES. 
1  Castilian  Foot  =  0.282655  Metre. 


Castilian 
v^nt- 

Hundreds. 

.beet. 
Thousands. 

0. 

100. 

200. 

300. 

4OO. 

5OO. 

600. 

7OO.  I  8OO. 

900. 

1 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

Metres. 

0 

0.00 

28.27 

50.53 

84.80 

113.06 

141.33 

169.59 

197.86 

226.12 

254.39 

1000 

282.65 

310.92 

339.19 

367.45 

395.72 

423.98 

452.25 

480.51    508.78 

537.04 

2000 

565.31 

593.58 

621.84 

650.11 

678.37 

706.64 

734.90 

763.17    791.43 

819.70 

3000 

847.96 

876.23 

904.50 

932.76 

961.03 

989.29 

1017.56 

1045.82  1074.09 

1102.35 

4000 

1130.62 

1158.89 

1187.15 

1215.42 

1243.68 

1271.95 

1300.21 

1328.48 

1356.74 

1385.01 

5000 

1413.27 

1441.54 

1469.S1 

1498.07 

1526.34 

1554.60 

1582.87 

1611.13 

1639.40 

1667.66 

6000 

1695.93  1724.20  1752.46 

1780.73 

1808.99 

1837.26 

1365.52 

1893.79  1922.05 

1950.32 

7000 

1978.58 

2006.85  2035.12 

2063.38 

2091.65 

2119.91 

2148.18  2176.44  2204.71 

2232.97 

8000 

2261.24  2289.51  2317.77 

2346.04  2374.30 

2402.57 

2430.83  2459.10  2487.36 

2515.63 

9000 

2543.89  ;  2572.  16  2600.43  2628.69  2656.96 

2685.22 

2713.49l2741.75  2770.02 

2798.28 

XXXVIII.     CONVERSION    OF    CASTILIAN    FEET    INTO    PARIS    OR    FRENCH    FEET. 

1  Castilian  Foot  =  0  8701382  Paris  Foot. 

Castilian 
i?<iAf 

Hundreds. 

.beet. 
Thousands. 

0. 

100. 

200. 

300. 

400. 

500. 

600. 

•700. 

800. 

900. 

Par.  Feet. 

Par.Feet. 

Par.Feet. 

Par  Feet. 

Par  Feet. 

Par.Feet. 

Par.Feet.  Par  Feet. 

Par.Feet. 

Par.Feet. 

0 

0.00 

87.01 

174.03 

261.04 

348.06 

435.07 

522.08    609.10 

696.11 

783.12 

1000 

870.14 

957.15 

1044.17 

1131.18 

1218.19 

1305.21 

1392.22  1479.23 

1566.25 

1653.26 

2000 

1740.28 

1827.29 

1914.30 

2001.32  2088.33 

2175.35 

2262.36  2349.37 

2436.39 

2523.40 

3000 

2610.41 

2697.43 

2784.44 

2871.46 

2958.47 

3045.48 

3132.50  3219.51 

3306.52 

3393.54 

4000 

3480.55 

3567.57 

3654.58 

3741.59 

3828.61 

3915.62 

4002.64 

4089.65 

4176.66 

4263.68 

5000 

4350.69 

4437.70 

4524.72 

4611.73 

4698.75 

4785.76  4872.77 

4959.79 

5046.80 

5133.82 

6000 

5220.83 

5307.84 

5394.86 

5481.87 

5568.88 

5655.90  5742.91  5829.93  5916.94 

6003.95 

7000 

6090.97 

6177.98 

6265.00 

6352.01 

6439.02 

6526.04  6613.05  6700.06 

6787.08 

6874.09 

8000 

6961.11 

7048.12 

7135.13 

7222.15 

7309.16 

7396.17  7483.19  7570.20 

7657.22 

7744.23 

9000 

7831.24 

7918.26 

8005.27 

8092.29  8179.30 

8266.31 

8353.33  8440.34 

8527.35 

8614.37 

XXXIX.     CONVERSION    OF    CASTILIAN    FEET    INTO    AMERICAN    FEET. 

1  Castilian  Foot  =  0.9273093  American  Foot. 

Castilian 

T^w>*- 

Hundreds. 

reet. 
Thousands. 

0. 

100. 

2OO. 

3OO. 

4OO. 

500. 

600. 

700. 

800. 

900. 

Am  Feet 

Am.  Feet. 

Am.  Feet. 

Am.  Feet. 

Am.  Feet. 

Am.  Feet. 

Am.Feet 

Am.Feet. 

Am.Feet 

Am.Feet 

0 

0.00 

92.73 

185.46 

278.19 

370.92 

463.65 

556.39 

649.12 

741.85 

834.58 

1000 

927.31 

1020.04 

1112.77 

1205.50 

1298.23 

1390.96 

1483.69  1576.43 

1669.16 

1761.89 

2000 

1854.62 

1947.35 

2040.08 

2132.81 

2225.54 

2318.27 

2411.00  2503.74 

2596.47 

2689.20 

3000 

2781.93 

2874.66 

2967.39 

3060.12 

3152.85 

3245.58 

3338.31  3431.04 

3523.78 

3616.51 

4000 

3709.24 

3801.97 

3894.70 

3987.43 

4080.16 

4172.89 

4265.62 

4358.35 

4451.08 

4543.82 

5000 

4636.55 

4729.28 

4822.01 

4914.74 

5007.47 

5100.20 

5192.93 

5285.66 

5378.39 

5471.12 

6000 

5563.86 

5656.59 

5749.32 

5842.05 

5934.78 

6027.51 

6120.24 

6212.97 

6305.70 

6398.43 

7000 

6491.17 

6583.90 

6676.63 

6769.36 

6862.09 

6954.82 

7047.55 

7140.28 

7233.01 

7325.74 

8000 

7418.47 

7511.21 

7603.94 

7696.67 

7789.40 

7882.13 

7974.86 

8067.59 

8160.32 

8253.05 

9000 

8345.78  8438.51 

8531.25 

8623.98 

8716.71 

8809.44 

8902.17|8994.90  9087.63 

9180.36 

D 


147 


TO   CONVERT 


FRACTIONAL    PARTS   OF   A  TOISE   AND   OF   A  FOOT 


INTO    EACH    OTHER. 


XL.    CONVERSION    OF    INCHES    INTO    DUODECIMAL   LINES. 
1  Inch  =  12  Lines. 


Inches. 

Inches.  Units. 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

Lines. 
0 

Lines. 
12 

Lines. 
24 

Lines. 
36 

Lines. 
48 

Lines. 
60 

Lines. 
72 

Lines. 
84 

Lines. 
96 

Lines. 
108 

10 

120 

132 

144 

156 

168 

180 

192 

204 

216 

228 

20 

240 

252 

264 

276 

288 

300 

312 

324 

336 

348 

30 

360 

372 

384 

396 

408 

420 

432 

444 

456 

468 

40 

480 

492 

504 

516 

528 

540 

552 

564 

576 

588 

50 

600 

612 

624 

636 

648 

660 

672 

684 

696 

708 

60 

720 

732 

744 

756 

768 

780 

792 

804 

816 

828 

70 

840 

852 

864 

876 

888 

900 

912 

924 

936 

948 

80 

960 

972 

984 

996 

1008 

1020 

1032 

1044 

1056 

1068 

90 

10SO 

1092 

1104 

1116 

1128 

1140 

1152 

1164 

1176 

1188 

100 

1200 

1212 

1224 

1236 

1248 

1260 

1272 

1284 

1296 

130S 

XLI.    CONVERSION    OF    DECIMALS    OF    A    TOISE    INTO    FEET    AND    INCHES. 
1  Toise  =  6  Feet  =  72  Inches  =  864  Lines. 


Toises. 

Hundredths  of  a  Toise. 

Tens. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

ft.  in.  lin. 

ft.  in.     lin. 

ft.  in.     lin. 

ft.  in.    lin. 

ft.  in     lin. 

ft.  in.  lin. 

ft.  in.     lin. 

ft.  in.  lin. 

ft.  in.    lin. 

ft.  in.    lin. 

0.0 

0.0.0,00 

0.  0.  8,64 

0.  1.  5,28 

0.  2.  1,92 

0.  2.10,56 

0.  3.7,20 

0.  4.  3,84 

0.5.  0,48 

0.  5.  9,12 

0.  6.  5,76 

0.1 

0.7.2,40 

0.  7.11,04 

0.  8.  7,68 

0.  9.  4,32 

0.10.  0,96 

0.10.9,60 

0.11.  6,24 

1.0.  2,88 

1.  0.11,52 

1.  1.  8,16 

0.2 

1.2.4,80 

1.  3.  1,44 

1.  3.10,08 

1.  4.  6,72 

1.  5.  3,36 

1.  6.0,00 

1.  6.  8,64 

1.7.  5,28 

1.  8.  1,92 

1.  8.10,56 

0.3 

1.9.7,20 

1.10.  3,84 

1.11.  0,48 

1.11.  9,12 

2.  0.  5,76 

2.  1.2,40 

2.  1.11,04 

2.2.  7,68 

2.  3.  4,32 

2.  4.  0,96 

0.4 

2.4.9,60 

2.  5.  6,24 

2.  6.  2,88 

2.  6.11,52 

2.  7.  8,16 

2.  8.4,80 

2.  9.  1,44 

2.9.10,08 

2.10.  6,72 

2.11.  3,36 

0.5 

3.0.0,00 

3.  0.  8,64 

3.  1.  5,28 

3.  2.  1,92 

3.  2.10,56 

3.  3.7,20 

3.  4.  3,84 

3.5.  0,48 

3.  5.  9,12 

3.  6.  5,76 

0.6 

3.7.2,40 

3.  7.11,04 

3.  8.  7,68 

3.  9.  4,32 

3.10.  0,96 

3.10.9,60 

3.11.  6,24 

4.0.  2,884.  0.11,52 

4.  1.  8,16 

0.7 

4.2.4,80 

4.  3.  1,44 

4.  3.10,08 

4.  4.  6,72 

4.  5.  3,36 

4.  6.0,00 

4.  6.  8,64 

4.7.  5,28  4.  8.  1,92 

I.  8.10,56 

0.8 

4.9.7,20 

4.10.  8,84 

4.11.  0,48 

4.11.  9,12 

5.  0.  5,76 

5.  1.2,40 

5.  1.11,04 

5.2.  7,68 

5.  3.  4,32 

5.  4.  0,96 

1  0.9 

5.4.9,605.  5.  6,24 

5.  6.  2,88  5.  6.11,52  5.  7.  8,16 

5.  8.4,80 

5.  9.  1,44 

5.9.10,085.10.  6,725.11.  3,36 

_  .  

D 


148 


XLII.     CONVERSION    OF    DECIMALS    OF    A    FOOT    INTO    INCHES    AND    DECIMALS. 


Feet. 
Tens. 

Hundredths  of  a  Foot. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

Inches. 
1.08 

0.0 

Inches. 
0.00 

Inches. 
0.12 

Inches. 
0.24 

Inches. 
0.36 

Inches. 
0.48 

Inches. 
0.60 

Inches. 
0.72 

Inches. 
0.84 

Inches. 
0.96 

0.1 

1.20 

1.32 

1.44 

1.56 

1.68 

1.80 

1.92 

2.04 

2.16 

2.28 

0.2 

2.40 

2.52 

2.64 

2.76 

2.88 

3.00 

3.12 

3.24 

3.36 

3.48 

0.3 

3.60 

3.72 

3.84 

3.96 

4.08 

4.20 

4.32 

4.44 

4.56 

4.68 

0.4 

4.80 

4.92 

5.04 

5.16 

5.28 

5.40 

5.52 

5.64 

5.76 

5.88 

0.5 

6.00 

6.12 

6.24 

6.36 

6.48 

6.60 

6.72 

6.84 

6.96 

7.08 

0.6 

7.20 

7.32 

7.44 

7.56 

7.68 

7.80 

7.92 

8.04 

8.16 

8.28 

0.7 

8.40 

8.52 

8.64 

8.76 

8.88 

9.00 

9.12 

9.24 

9.36 

9.48 

0.8 

9.60 

9.72 

9.84 

9.96 

10.08 

10.20 

10.32 

10.44 

10.56 

10.68 

0.9 

10.80 

10.92 

11.04 

11.16 

11.28 

11.40 

11.52 

11.64 

11.76 

11.88 

XLIII.    CONVERSION  OF  DECIMALS  OF  A  FOOT  INTO  INCHES  AND  DUODECIMAL  LINES. 

Feet. 
Tens. 

Hundredths  of  a  Foot. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0.0 
0.1 
0.2 
0.3 
0.4 

In.  Line. 
0.0,00 
1.2,40 
2.4,80 
3.7,20 
49,60 

In.    Line. 
0.  1,44 
1.  3,84 
2.  6,24 
3.  8,64 
4.11,04 

In.    Line. 
0.  2,88 
1.  5,28 
2.  7,68 
3.10,08 
5.  0,48 

In.    Line. 
0.  4,32 
1.  6,72 
2.  9,12 
3.11,52 
5.  1,92 

In.   Line. 
0.  5,76 
1.  8,16 
2.10,56 
4.  0,96 
5.  3,36 

In.  Line. 
0.7,20 
1.9,60 
3.0,00 
4.2,40 
5.4,80 

[n.   Line. 
0.  8,64 
1.11,04 
3.  1,44 
4.  3,84 
5.  6,24 

In.    Line. 
0.10,08 
2.  0,48 
3.  2,88 
4.  5,28 
5.  7,68 

In.    Line. 
0.11,52 
2.  1,92 
3.  4,32 
4.  6,72 
5.  9,12 

In.    Line. 
1.  0,96 
2.  3,36 
3.  5,76 
4.  8,16 
5.10,56 

0.5 
0.6 
0.7 
0.8 
0.9 

6.0,00 
7.2,40 
8.4,80 
9.7,20 
10.9,60 

6.  1,44 
7.  3,84 
8.  6,24 
9.  8,64 
10.11,04 

6.  2,88 
7.  5,28 
8.  7,68 
9.10,08 
11.  0,48 

6.  4,32 
7.  6,72 
8.  9,12 
9.11,52 
11.  1,92 

6.  5,76 
7.  8,16 
8.10,56 
10.  0,96 
11.  3,36 

6.7,20 
7.9,60 
9.0,00 
10.2,40 
11.4,80 

6.  8,64 
7.11,04 
9.  1,44 
10.  3,84 
11.  6,24' 

6.10,08 
8.  0,48 
9.  2,88 
10.  5,28 
11.  7,68 

6.11,52 
8.  1,92 
9.  4,32 
10.  6,72 
11.  9,12 

7.  0,96 
8.  3,36 
9.  5,76 
10.  8,16 
11.10,56 

XLIV.    CONVERSION  OF  INCHES  AND   DUODECIMAL  LINES  INTO  DECIMALS  OF  A  FOOT. 
1  Inch  =  0.08333  of  a  Foot.        1  lane  ==  0.006944  of  a  Foot. 


Inches. 

Lines. 

0. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

10. 

11. 

Foot. 

Foot. 

Foot. 

Foot. 

Foot. 

Foot. 

Foot. 

Foot. 

Foot. 

Foot. 

Foot. 

Foot. 

0 

0.0000 

0.0069 

0.0139 

0.0208 

0.0278 

0.0347 

0.0417 

0.0486 

0.0556 

0.0625 

0.0694 

0.0764 

1 

0.0833 

0.0903 

0.0972 

0.1042 

0.1111 

0.1181 

0.1250 

0.1319 

0.1389 

0.1458 

0.1528 

0.1597 

2 

0.1667 

0.1736 

0.1806 

0.1875 

0.1944 

0.2014 

0.2083 

0.2153 

0.2222 

0.2292 

0.2361 

0.2431 

3 

0.2500 

0.2569 

0.2639 

0.2708 

0.2778 

0.2847 

0.2917 

0.2986 

0.3056 

0.3125 

0.3194 

0.3264 

4 

0.3333 

0.3403 

0.3472 

0.3542 

0.3611 

0.3681 

0.3750 

0.3819 

0.3889 

0.3958 

0.4028 

0.4097 

5 

0.4167 

0.4236 

0.4306 

0.4375 

0.4444 

0.4514 

0.4583 

0.4653 

0.4722 

0.4792 

0.4861 

0.4931 

6 

0.5000 

0.5069 

0.5139 

0.5208 

0.5278 

0.5347 

0.5417 

0.5486 

0.5556 

0.5625 

0.5694 

0.5764 

7 

0.5833 

0.5903 

0.5972 

0.6042 

0.6111 

0.6181 

0.6250 

0.6319 

0.6389 

0.6458 

0.6528 

0.6597 

8 

0.6667 

0.6736 

0.6806 

0.6875 

0.6944 

0.7014 

0.7083 

0.7153 

0.7222 

0.7292 

0.7361 

0.7431 

9 

0.7500J0.7569 

0.7639 

0.7708 

0.7778 

0.7847 

0.7917 

0.7986  0.8056 

0.8125 

0.8194 

0.8264 

10 

0.8333  0.8403 

0.8472 

0.8542 

0.8611 

0.8681 

0.8750 

0.88190.8889 

0.8958 

0.9028 

0.9097 

11 

0.9167|0.9236  0.9306 

0.9375 

0.9444 

0.9514 

0.9583 

0.96530.9722 

0.9792 

0.9861 

0.9931 

D 


149 


METEOROLOGICAL    TABLES. 


v. 
METEOROLOGICAL    CORRECTIONS, 


OR 


TABLES 


FOR    CORRECTING    SERIES    OP    OBSERVATIONS    FOR   THE    PERIODIC 
AND    NON-PERIODIC    VARIATIONS. 


E 


CONTENTS. 


[The  figures  refer  to  the  folio  at  the  bottom  of  the  page.  —  The  letters  near  them  mean,  D.  =  calculated  by  Dove 
Gl.  =  Glaisher ;  G.  =  Guyot ;  L.  =  Lefroy.    For  the  letters  before  the  latitudes,  see  page  12.] 


Temperature. 
Hourly  Corrections  for  Periodic  Variations. 


TABLE  I. 

"  II. 

«  III. 

"  IV. 

«  V. 

"  VI. 

«  VII. 

"  VIII. 

"  IX. 

"  X. 

«  XL 

«  XII. 

"  XIII. 

«  XIV. 

"  XV. 


NORTH    AMERICA. 
Station. 

Washington,  District  Columbia, 
Philadelphia,  Girard  College, 
Philadelphia,  Girard  College, 
Frankfort  Arsenal,  Penn., 
Frankfort  Arsenal,  Penn., 
Toronto,  Canada  West, 
Toronto,  Canada  West, 
Toronto,  Canada  West, 
Toronto,  Canada  West, 
Montreal,  Canada  East, 
Sitka,  Russian  America, 
Boothia  Felix,  Arctic  America, 
Lake  Athabasca,  Arctic  America, 
Melville  Island,  Arctic  America, 
Hecla  Cove,  Spitzbergen, 


Latitude.  Scale.  Page. 

B  i.  38  54  N.  Reau.  D.  15 

A'3.  39  58  N.  Reau.  D.  15 

A'3.  39  58  N.  Fahr.  G.  16 

C.  39  57  N.  Reau.  D.  17 

C.  39  57  N.  Fahr.  D.  18 

B.  43  40  N.  Fahr.  D.  19 

B.  43  40  N.  Reau.  D.  20 
A'6.  43  40  N.  Fahr.  L.  21 
A'6.  43  40  N.  Reau.  D.  22 
A'l.  45  30  N.  Fahr.  G.  22 
A'5.  57     3N.  Reau.  D.  23 
A.  69  59  N.  Reau.  D.  24 

C.  59        N.  Fahr.  L.  25 
C.  74  47  N.  Reau.  D.  25 
C.  79  55  N.  Reau.  D.  25 


"   XVI. 

«  XVII. 
E 


SOUTH   AMERICA. 


Rio  Janeiro,  Brazil, 
Rio  Janeiro,  Brazil, 


C. 
C. 


22  54  S. 
22  54  S. 


Fahr. 
Reau. 


D. 
D. 


26 

27 


CONTENTS, 


ASIA. 


Station. 

TABLE   XVIII. 

Trevandrum,  India, 

u 

XIX. 

Trevandrum,  India, 

4 

XX. 

Madras,  India, 

u 

XXI. 

Madras,  India, 

u 

XXII. 

Bombay,  India, 

it 

XXIII. 

Bombay,  India, 

It 

XXIV. 

Madras,  India, 

It 

XXV. 

Bombay,  India, 

tl 

XXVI. 

Calcutta,  India, 

" 

XXVII. 

Tiflis,  Georgia, 

" 

XXVIII. 

Peking,  China, 

u 

XXIX. 

Nertchinsk,  Siberia, 

ti 

XXX. 

Nertchinsk,  Siberia, 

it 

XXXI. 

Barnaul,  Siberia, 

" 

XXXII. 

Barnaul,  Siberia, 

" 

XXXIII. 

Barnaul,  Siberia, 

EUROPE. 

It 

XXXIV. 

Rome,  Italy, 

tl 

XXXV. 

Padua,  Italy, 

It 

XXXVI. 

Geneva,  Switzerland, 

It 

XXXVII.  ^ 

Geneva,  Switzerland, 

tl 

XXXVIII.  * 

St.  Bernard,  Switzerland, 

" 

XXXIX. 

St.  Bernard,  Switzerland, 

tl 

XL. 

Kremsmiinster,  Austria, 

" 

XLI. 

Salzburg,  Austria, 

It 

XLII. 

Munich,  Bavaria, 

u 

XLIII. 

Prague,  Bohemia, 

11 

XLIV. 

Prague,  Bohemia, 

11 

XLV. 

Plymouth,  England, 

11 

XLVI. 

Plymouth,  England, 

11 

XL  VII. 

Brussels,  Belgium, 

11 

XL  VIII. 

Brussels,  Belgium, 

" 

XLIX. 

Schwerin,  Germany, 

It 

L. 

Miihlhausen,  Prussia, 

It 

LI. 

Utrecht,  Holland, 

11 

LII. 

Greenwich,  England, 

" 

LIII. 

Greenwich,  England, 

It 

LIV. 

Greenwich,  England, 

tl 

LV. 

Halle,  Prussia, 

It 

LVI. 

Gottingen,  Hanover, 

E 

4 

Latitude. 

Scale. 

Page. 

o 

I 

A. 

8 

31 

N. 

Fahr. 

D. 

31 

A. 

8 

31 

N. 

Reau. 

D. 

32 

A. 

13 

4 

N. 

Fahr. 

D. 

33 

A. 

13 

4 

N. 

Reau. 

D. 

34 

A. 

18 

56 

N. 

Fahr. 

D. 

35 

A. 

18 

56 

N. 

Reau. 

D. 

36 

A'5. 

13 

4 

N. 

Reau. 

D. 

37 

A'4. 

18 

56 

N. 

Reau. 

D. 

37 

A'2. 

22 

33 

N. 

Reau. 

D. 

38 

A'4. 

41 

41 

N. 

Reau. 

D. 

39 

A'4. 

39 

54 

N. 

Reau. 

D. 

39 

A'6. 

51 

18 

N. 

Reau. 

D. 

40 

A. 

51 

18 

N. 

Reau. 

D. 

41 

A. 

53 

20 

N. 

Fahr. 

D. 

42 

A. 

53 

20 

N. 

Reau. 

D. 

43 

A;6. 

53 

20 

N. 

Reau. 

D. 

44 

C. 

41 

54 

N. 

•  Reau. 

D. 

47 

C. 

45 

24 

N. 

Reau. 

D. 

48 

Cio. 

46 

12 

N. 

Reau. 

D. 

49 

C'4. 

46 

12 

N. 

Reau. 

D. 

49 

Cio. 

45 

52 

N. 

»  Reau. 

D. 

50 

C'4. 

45 

52 

N. 

Reau. 

D. 

50 

C. 

48 

3 

N. 

Reau. 

D. 

51 

A'6. 

47 

48 

N. 

Reau. 

D. 

52 

A'6. 

48 

9 

N. 

Reau. 

D. 

52 

A'IO. 

50 

5 

N. 

Reau. 

D. 

53 

A. 

50 

5 

N. 

Reau. 

D. 

54 

C. 

50 

22 

N. 

Fahr. 

D. 

55 

C. 

50 

22 

N. 

Reau. 

D. 

56 

B. 

50 

51 

N. 

Reau. 

D. 

57 

B'. 

50 

51 

N. 

Reau. 

D. 

58 

B'3. 

53 

36 

N. 

Reau. 

D. 

58 

C. 

51 

13 

N. 

Reau. 

D. 

59 

A'2. 

52 

5 

N. 

Reau. 

D. 

60 

B'7. 

51 

29 

N. 

Reau. 

D. 

60 

B. 

51 

29 

N. 

Reau. 

D. 

61 

B. 

51 

29 

N. 

Fahr. 

Gl. 

62 

C. 

51 

30 

N. 

Reau. 

D. 

63 

C. 

51 

32 

N. 

Reau. 

D. 

64 

CONTENTS. 


Station. 

Latitude. 

O           I 

Scale. 

Page. 

TABLE       LVII. 

Berlin,  Prussia, 

A. 

52  30  N. 

Reau. 

D. 

65 

tt 

LVIII. 

Salzuflen,  Germany, 

A. 

52     5N. 

Reau. 

D. 

66 

w 

LIX. 

Stettin,  Germany, 

A'. 

53  25  N. 

Reau. 

D. 

67 

u 

LX. 

Apenrade,  Sleswick, 

C. 

55     3N. 

Reau. 

D. 

68 

u 

LXI. 

Leith,  Scotland, 

A. 

55  59  N. 

Fahr. 

D. 

69 

(f 

LXII. 

Leith,  Scotland, 

A. 

55  59  N. 

Reau. 

D. 

70 

it 

LXIII. 

Makerstoun,  Scotland, 

A'3. 

55  36  N. 

Reau. 

D. 

71 

tf 

LXIV. 

Dublin,  Ireland, 

B'4. 

53  23  N. 

Reau. 

D. 

71 

M 

LXV. 

Catharinenburg,  Russia, 

A. 

56  50  N. 

Reau. 

D. 

72 

it 

LXVI. 

Catharinenburg,  Russia, 

A'6. 

56  50  N. 

Reau. 

D. 

73 

it 

LXVII. 

St.  Petersburg,  Russia, 

A'IO 

.  59  56  N. 

Reau. 

D. 

73 

it 

LXVIII. 

Helsingfors,  Finland, 

A'3. 

60  10  N. 

Reau. 

D. 

74 

It 

LXIX. 

St.  Petersburg,  Russia, 

A. 

59  56  N. 

Reau. 

D. 

75 

It 

LXX. 

Helsingfors,  Finland, 

C. 

60  10  N. 

Reau. 

D. 

76 

tt 

LXXI. 

Christiania,  Norway, 

C. 

59  55  N. 

Reau. 

D. 

77 

it 

LXXII. 

Drontheim,  Norway, 

C. 

63  26  N. 

Reau. 

D. 

78 

tt 

LXXIII. 

Strait  of  Kara,  Russia, 

A 

70  37  N. 

Reau. 

D. 

79 

It 

LXXIV. 

Matoschkin  Schar,  Novaia  Zemlia, 

A. 

73        N. 

Reau. 

D. 

80 

It 

LXXV. 

Bossekop,  Norway, 

C. 

69  58  N. 

Reau. 

D. 

81 

tt 

LXXV. 

Bossekop,  Norway, 

C. 

69  58  N. 

Centig. 

.  G. 

81 

AFRICA   AND    AUSTRALIA. 

(( 

LXXVI. 

St.  Helena,  Africa, 

A'6. 

15  55  S. 

Reau. 

D. 

85 

tt 

LXXVII. 

Cape  of  Good  Hope,  Africa, 

A'5. 

33  56  S. 

Reau. 

D. 

85 

a 

LXXVIII. 

Hobarton,  Tasmania, 

A'8. 

42  53  S. 

Reau. 

D. 

86 

Monthly  Corrections  for  Non-periodic  Variations. 

Station. 

Latitude. 

Scale. 

Page. 

O           I 

TABLE  LXXIX. 

Madras,  India, 

13     4N. 

Reau. 

D. 

90 

« 

LXXX. 

Palermo,  Sicily, 

38     7N. 

Reau. 

D. 

91 

a 

LXXXI. 

Milan,  Italy, 

45  28  N. 

Reau. 

D. 

92 

(C 

LXXXII. 

Geneva,  Switzerland, 

46  12  N. 

Reau. 

D. 

94 

tt 

LXXXIII. 

Vienna,  South  Germany, 

48  13  N. 

Reau. 

D. 

96 

a 

LXXXIV. 

Ratisbon,  South  Germany, 

49     1  N. 

Reau. 

D. 

97 

tt 

LXXXV. 

Stuttgard,  South  Germany, 

48  46  N. 

Reau. 

D. 

99 

n 

LXXXVI. 

Carlsru-he,  South  Germany 

49     1  N. 

Reau. 

D. 

100 

it 

LXXXVII. 

Berlin,  North  Germany, 

52  30  N. 

Reau: 

D. 

102 

it 

LXXXVIIT. 

Copenhagen,  Denmark, 

55  41  N. 

Reau. 

D. 

105 

it 

LXXXIX. 

Paris,  France, 

48  50  N. 

Reau. 

D. 

107 

tt 

xc. 

Zwanenburg,  Holland, 

52  23  N. 

Reau. 

D. 

108 

tt 

XCI. 

London,  England, 

51  30  N. 

Reau. 

D. 

110 

E 

5 

CONTENTS. 

Station.                                                                  Latitude.           Scale.  Page. 

TABLE  XCII.     Kinfauns  Castle,  Scotland,                         56  24  N.     Reau.  D.     112 

"      XCIII.     Tornea,  Finland,                                         65  50  N.     Reau.  D.     112 

"      XCIV.     Albany,  N.  Y.,  North  America,                42  39  N.     Reau.  D.     113 

"        XCV.     Salem,  Mass.,  North  America,                  42  31  N.     Reau.  D.     114 

"      XCVI.     Reikiavik,  Iceland,                                      64     8  N.     Reau.  D.     115 

"     XCVII.     Godthaab,  Greenland,                                64  10  N.     Reau.  D.     115 

Force  of  Vapor  and  Relative  Humidity. 
Hourly  Corrections  for  Periodic  Variations. 

"   XCVIII.     Greenwich,  England,  Force  of  Vapor,  by  Glaisher,           .  .119 

"      XCIX.     Greenwich,  England,  Relative  Humidity,  by  Glaisher,  .         120 


E 


METEOROLOGICAL     CORRECTIONS. 


ONE  of  the  prominent  objects  of  a  prolonged  series  of  meteorological  observations 
is  to  determine  the  mean  condition  of  the  atmosphere,  during  a  given  interval  of 
time,  such  as  a  day,  a  month,  or  a  year,  as  to  its  temperature,  moisture,  and  baro- 
metric pressure.  In  order  to  furnish  the  true  means  of  these  elements,  free  from  the 
periodic  changes  which  depend  upon  the  daily  course  of  the  sun  and  upon  the  seasons, 
the  observations  ought  to  be  made  at  equal  intervals  of  time,  and  be  so  often  repeated 
as  actually  to  represent  the  sum  of  the  variations  which  took  place  during  the  stated 
time.  It  is  generally  admitted  that  observations  taken  at  every  one  of  the  twenty- 
four  hours  of  the  day  give  means  which  do  not  sensibly  differ  from  the  means 
which  would  be  obtained  from  a  still  larger  number  of  observations  during  the  same 
time  ;  so  that  means  derived  from  hourly  observations  may  be  considered  as  the  true 
daily,  monthly,  and  annual  means  of  the  year  in  which  the  observations  were 
taken. 

However,  as  the  means  of  a  given  month,  or  year,  will  generally  be  found  some- 
what to  differ  from  those  of  another  year,  at  the  same  place,  from  causes  which  are 
not  of  a  periodic  nature,  it  is  obvious  that  the  absolute  means  can  only  be  derived 
from  the  means  of  a  series  of  years,  in  which  the  differences  arising  from  these  non- 
periodic  variations  may  be  considered  as  sufficiently  balancing  each  other. 

Hourly  observations  can  be  expected  only  from  a  very  few  stations,  favored  with 
peculiar  arrangements  for  the  purpose.  By  far  the  larger  number  of  observers  must 
necessarily  confine  themselves  to  three  or  four  observations  a  day.  The  means, 
therefore,  deduced  from  such  a  set  of  observations,  generally  differ  from  the  true 
means  which  would  be  given  by  hourly  observations,  by  a  quantity  which  varies 
with  the  hours  selected  for  the  observations.  If  that  quantity,  however,  is  known  by 
having  been  previously  determined  for  every  hour,  or  set  of  hours,  by  a  long  series 

E  7    ' 


METEOROLOGICAL    CORRECTIONS. 

of  hourly  observations  taken  at  some  station  in  a  similar  climatic  situation,  it  is  evident 
that,  whatever  be  the  hours  at  which  observations  are  taken,  the  means  derived  from 
them  can  always  be  reduced  to  the  true  means  by  correcting  them  for  that  dif- 
ference. 

The  following  tables  furnish  such  corrections,  both  for  periodic  and  non-periodic 
variations  of  temperature,  and  for  stations  situated  in  various  latitudes.  They  give 
the  quantities  which  must  be  added  to,  or  subtracted  from,  the  hourly  means,  in  order 
to  obtain  the  true  means  of  the  day,  of  the  month,  and  of  the  year. 

Two  tables  of  the  same  description,  for  moisture,  which  may  be  considered  as 
specimens  of  the  kind,  close  the  set. 

Two  other  tables,  for  correcting  the  mean  barometric  pressures,  are  found  at  the 
end  of  the  Hypsometrical  Tables,  pp.  92,  93. 


E 


CORRECTIONS    FOR    TEMPERATURE. 


HOURLY    CORRECTIONS    FOR    PERIODIC   VARIATIONS, 


OR 


TABLES 


FOR  REDUCING  THE  MEANS  OP  THE  OBSERVATIONS  TAKEN  AT  ANY  HOUR  OF 

THE  DAY  TO  THE  TRUE  MEAN  TEMPERATURE  OF  THE  DAY,  OF 

THE  MONTH,  AND  OF  THE  YEAR. 


E 


HOURLY  CORRECTIONS  FOR  PERIODIC  VARIATIONS, 

OR 

CORRECTIONS    TO    BE    APPLIED    TO    THE    MEANS    OF   THE    HOURS    OF    OBSERVATION,    OR 

SETS  OF    HOURS,  IN    ORDER  TO  OBTAIN    THE    TRUE    MEAN    TEMPERATURES 

OF    THE    RESPECTIVE    DAYS,    MONTHS,   AND    OF    THE    YEAR. 

THE  following  set  contains  all  the  tables  for  correcting  the  means  of  observations 
on  atmospheric  temperature  for  the  effect  of  diurnal  variation  which  have  been  pub- 
lished by  Dove,  together  with  a  few  others  of  the  same  description.  Dove's  tables 
are  found  in  two  papers,  published  in  the  Memoirs  of  the  Royal  Academy  of  Berlin 
for  1846  and  for  1856,  and  in  the  first  Report  on  the  Observations  of  the  Meteoro- 
logical Institute  of  Prussia,  Berlin,  1851. 

In  the  first  paper  are  twenty-nine  tables,  in  Reaumur's  scale,  nine  of  which  have 
been  republished,  in  Fahrenheit's  scale,  in  the  Proceedings  of  the  British  Associa- 
tion for  1847,  and  will  also  be  found  below.  In  that  series  the  corrections  have 
been  formed  by  finding  first  the  differences  between  the  hourly  and  the  true  means, 
and  then  computing  the  observations  by  Bessel's  formula,  in  order  to  eliminate  the 
accidental  irregularities  due  to  the  shortness  of  the  period  during  which  the  observa- 
tions were  taken.  Calling  x  the  horary  angle  reckoned  from  noon,  Bessel's  for- 
mula is 

tx  =  u  -f  u1  sin  (a?  -f  U')  +  u"  sin  (2  x  +  U")  +  u"'  sin  (3  a?  +  U"'). 

The  stations  at  which  hourly  observations  were  made  are  Trevandrum,  Madras, 
Bombay,  Salzuflen,  Prague,  St.  Petersburg,  Catharinenburg,  Barnaul,  Nertchinsk, 
Matoschkin-Schar,  Strait  of  Kara,  and  Boothia  Felix.  Bi-hourly  observations  were 
taken  at  Brussels,  Greenwich,  and  Toronto  ;  in  all  others  the  night  observations  are 
wanting,  and  were  obtained  by  interpolation.  Moreover,  in  several  stations  the  num- 
ber of  observations  was  small,  at  Madras  even  only  thirty-six  days.  The  tables  of 
that  series  may  be  readily  distinguished  from  those  belonging  to  the  same  stations  in 
the  second,  by  their  containing  the  corrections  for  several  sets  of  hours,  which  are 
not  found  in  the  tables  of  the  other. 

In  Dove's  second  series,  and  in  all  other  tables,  the  corrections  given  are  simply 
the  differences,  with  reverse  signs,  between  the  hourly  and  the  true  means,  excepting, 
however,  the  stations  of  Toronto,  in  which  the  corrections  were  computed,  by  Bes- 
sel's formula,  by  Colonel  Sabine  ;  of  Prague,  by  Jelineck  ;  of  Salzburg,  and  those  of 
Geneva  and  St.  Bernard,  by  Plantamour.  . 

The  observations  from  which  these  tables  are  derived  were  made  hourly  at  Hobar- 
ton  during  8  years  ;  at  the  Cape  of  Good  Hope,  for  5£  years  ;  St.  Helena,  5  years ; 
Madras,  5  years  ;  Bombay,  4  years  ;  Calcutta,  1£  years  ;  Toronto,  6  years  ;  Phila- 
delphia, 3  years  ;  Makerstoun,  3  years  ;  Utrecht,  If  years  ;  Prague,  10£  years  ; 
Munich,  7  years  ;  Salzburg,  6  years  ;  St.  Petersburg,  10  years ;  Catherinenburg,  6 
years  ;  Barnaul,  5  years  ;  Tiflis,  4  years  ;  Nertchinsk,  6  years  ;  Peking,  4  years  ; 
Sitka,  5  years.  In  the  following  stations  the  observations  were  bi-hourly  :  —  Wash- 
ington, for  14-  years ;  Greenwich,  7  years  ;  Dublin,  4  years  ;  Brussels,  9  years  ;  Ge- 
neva and  St.  Bernard,  4  years  ;  Schwerin,  3  years. 

The  observations  made  in  England,  and  in  her  colonies,  are  found  in  the  various 
government  publications.  Those  of  the  Russian  stations  are  taken  from  the  Annuaire 
Meteor  ologique  et  Magnetique  des  Ingenieurs  des  Mines,  and  in  the  Annales  de 

E  11 


HOURLY    CORRECTIONS    FOR    PERIODIC    VARIATIONS. 

Conservatoire  Physique  Central  de  Russie.  The  observations  made  at  Prague,  Mu- 
nich, Geneva,  with  those  at  St.  Bernard,  Makerstoun,  Greenwich,  Brussels,  and  Wash- 
ington, were  published  by  their  respective  Observatories  ;  those  of  Utrecht,  by  Buys- 
Ballot  ;  of  Dublin,  by  Lloyd,  in  his  Notes  on  the  Meteorology  of  Ireland  ;  those  of 
Schwerin  were  communicated  in  manuscript  by  Dippe  ;  the  observations  at  Melville 
Island  are  published  in  No.  42  of  the  Parliamentary  papers  for  1854  ;  and  those  at 
Bossekop,  by  Martins  and  Bravais,  in  the  Voyage  de  la  Commission  Scientiflque  du 
Nord. 

The  tables  of  this  second  series  being  mostly  deduced  from  longer  series  of  obser- 
vations than  those  in  the  first,  when  the  same  station  is  found  in  both,  the  table  in  the 
second  is  generally  to  be  preferred. 

Glaisher's  table  for  Greenwich  has  been  taken  from  the  Greenwich  Observations. 
Captain  Lefroy  kindly  furnished  the  tables  for  Toronto  and  Lake  Athabasca.  To 
him  the  author  is  also  indebted  for  the  observations  made  at  Montreal  by  Mr.  McCord, 
from  which  Table  X.  was  computed.  Table  III.,  for  Philadelphia,  was  deduced  by 
the  writer  from  the  observations  made  at  Girard  College  under  the  direction  of  Prof. 
A.  D.  Bache. 

In  order  to  facilitate  the  selection  of  the  tables,  they  are  marked  in  the  table  of 
contents  with  capitals,  which  have  the  following  signification  :  — 

A  and  B  mean  that  the  tables  have  been  derived  from  hourly  and  bi-hourly  obser- 
vations, and  have  been  computed  by  Bessel's  formula  ;  C,  that  the  tables  contain 
values  obtained  by  interpolation. 

A',  B',  and  C'  indicate  the  tables  based  respectively  on  hourly  and  bi-hourly  or 
partly  interpolated  observations,  which  give  simply  the  differences  between  the  hourly 
and  the  true  means. 

The  figures  added  to  the  letters  indicate  the  number  of  years  during  which  the 
observations  used  in  forming  the  table  were  carried  on.  The  stations  are  arranged, 
in  each  continent,  in  the  order  of  their  latitude. 

USE  OF  THE  TABLES. 

In  order  to  reduce  meteorological  means  obtained  from  any  set  of  hours  to  the  true 
means,  the  table  best  suited  to  the  purpose  must  first  be  selected.  The  diurnal  vari- 
ation changing  with  the  seasons,  the  latitude,  the  altitude,  and  the  distance  from  the 
sea-shore,  the  station  which  comes  nearest,  in  all  these  respects,  to  the  station  the 
observations  of  which  are  to  be  corrected,  must  be  adopted. 

Suppose  the  thermometer  has  been  observed  at  Baltimore,  during  the  month  of 
January,  at  7  A.  M.,  1  P.  M.,  and  7  P.  M.,  and  the  monthly  means  of  these  hours  to 
be  respectively  27°,  35°,  and  31°  Fahrenheit.  We  take  Table  III.,  Philadelphia,  it 
being  the  nearest  in  latitude  and  climatic  situation.  We  find  the  correction  for  the 
hours  7,  1,  and  7,  and  we  have 

Observed  Means.      Corrections.  True  Means. 

For  7  A.  M.  27°  +  3°.63  =  30°.63 

For  1  P.  M.  35°  — -  3°.87  —  31°.13 

For  7  P.  M.  31°  —  1°.13  =  29°.87 

Sums,  ~93*  —  1°.37  =  91°.63 

Means,    31°  —  0°.46  =  30°.54  True  Mean  for  January. 

It  is  obvious  that  the  corrections  can  be  applied,  either  separately  to  each  hour,  as 
is  done  above,  or  collectively,  in  taking  the  mean  of  the  three  hourly  corrections  and 
applying  it  to  the  mean  of  the  three  observations,  as  in  the  last  line,  which  is  the  more 
convenient  method.  Therefore,  in  order  to  find  the  correction  for  any  set  of  hours, 
it  suffices  to  take  the  mean  of  the  corrections  given  in  the  table  for  the  hours  compos- 
ing the  set.  The  true  daily  means  can  be  found  in  the  same  way,  and  the  true  yearly 
means  can  be  derived  from  the  corrected  monthly  means,  or  by  applying  the  correc- 
tions given  in  the  last  column, 

E  12 


HOURLY    CORRECTIONS 


i 

FOR 


PERIODIC    VARIATIONS. 


NORTH  AMERICA.  —  SOUTH  AMERICA. 


E  13 


I. 

NORTH  AMERICA.  —  WASHINGTON.    Lat.  38°  54'  N.    Long.  77°  3'  W.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour.            Jan.       Feb. 

March. 

April. 

May. 

June.    July. 

Aug. 

Sept. 

Oct.       Nov.      Dec. 

Year. 

A.M.  012'       1.15      1.26 

1.60 

1.95 

2.33 

2.87    2.94 

2.31 

2.3< 

>     1.73 

0.85 

0.96 

1.86 

2  12'      1.28     1.86 

2.14 

2.40 

3.15 

3.21     3.25     3.07 

2.7; 

>     2.27 

1.34 

1.12 

2.32 

4  12'      1.45    2.18 

2.67 

2.75 

3.56 

3.64    3.83 

3.49 

3.K 

>     2.89 

1.92 

1.54 

2.76 

6  12'  1    1.88     2.32 

2.76 

2.59 

2.20 

2.23    2.12 

2.81 

3.05 

!     3.19 

2.18 

1.81 

2.43 

8  12'      1.48     1.76 

1.68 

1.05 

0.32 

-0.16    0.09 

0.28 

1.0 

[     1.69 

1.88 

1.68 

1.07 

10  12'    -0.18  -0.58 

-0.88 

-0.76 

-1.24 

-1.82  -1.32 

-1.81 

-1.3] 

-1.25 

-0.17 

-0.15 

-0.96 

P.M.  012'  1-1.47-2.05 

-2.36 

-2.39 

-2.64 

-2.69  -2.55 

-2.97 

-2.95 

5  -2.89 

-1.90 

-1.57 

-2.37 

2  12'    -2.60  -3.15 

-3.35  -3.41 

-3.57-3.84-3.49 

-3.83 

-3.7^ 

[  -3.64 

-2.44  -2.50 

-3.30 

4  12'   -2.32  -3.05 

-3.20 

-3.51  -3.66  -4.29  -4.16 

-3.59 

-3.6c 

•  -3.29  -2.08  1-2.19 

-3.25 

6  12'   -0.76  -1.25 

-1.73 

-2.18J-2.44 

-1.60  -2.24 

-1.74 

-1.8* 

-1.84 

-1.59  -1.01 

-1.69 

8  12'    -0.23     0.02 

-0.05 

0.06 

0.27 

0.44-0.21  -0.26 

-0.2S 

,     0.18 

-0.22 

-0.26 

-0.04 

10  12'      0.33     0.69 

0.76 

1.42 

1.67 

2.04  1   1.26 

1.79 

1.41 

0.98 

0.23 

0.43 

1.08 

Means.       1.32     1.52 

6.26 

9.02 

12.64 

18.34  19.29 

17.78 

16.0 

4   7.47 

5.20 

1.63 

II. 

N.  AMERICA.  —  PHILADELPHIA. 

Lat 

39°  58'  N.    Long.  75°  11'  W.  Gr.—  DOVE. 

Degrees  of  Reaumur. 

Hour. 

1    Jan. 

Feb. 

March.    April. 

May. 

June.      July. 

Aug.       Sept. 

Oct. 

Nov. 

Dec.       Year. 

Midn. 

0.64 

1.27 

1.33 

1, 

81 

2.06 

2.34     2.10 

1.94 

2.12 

1.70 

1.31 

0.62 

1.60 

1 

0.94 

1.48 

1.61 

2. 

20 

2 

.32 

2.63 

2.45 

2.19 

2.04 

1.87 

1.22 

0.81 

1.81 

2 

1,00 

1.67 

1.85 

2.58 

2 

64 

2 

.86 

2.69 

2.41 

2.22 

2.18 

1.43 

0.98 

2.04 

3 

1.13 

1.95 

2.00 

2. 

76 

2.96 

3 

.20 

2.88 

2.44 

2.43 

2.36 

1.50 

1.12 

2.23 

4 

1.24 

2.05 

2.08 

2.97 

3.27 

3 

.40 

3.04 

2.74 

2.56 

2.58 

1.74 

1.28 

2/41 

5 

1.36 

2.13 

2.50 

3. 

06 

3.32 

3.28 

3.11 

2.89 

2.68 

2.78 

1.83 

1.38 

2.53 

D 

1.50 

2.24 

2.44 

2. 

84 

2.63 

2 

.54 

2.56 

2.64 

2.65 

2.95 

1.89 

1.44 

2.36 

7 

1.60 

2.28 

2.24 

2. 

15 

1.68 

1 

.45 

1.53 

1.84 

1.92 

2.40 

1.88 

1.36 

1.86 

8 

1.40 

1.46 

1.26 

1. 

17 

0.65 

0.40 

0.54 

0.67 

0.78 

1.08 

1.21 

1.14 

0.98 

9 

0.78 

0.57 

0.35 

0. 

23 

-0.39 

-0.52  -0.36 

-0.20  -0.18 

-0.15 

0.26 

0.52 

0.08 

10          0.02 

-0.39  -0.46  -0. 

71 

-1 

06 

-1 

.23  -1.00 

-1.05 

-1.08 

-1.17 

-0.56 

-0.22 

-0.74 

11       -0.6S 

-1.20 

-i.: 

58 

-1. 

54 

-1 

74 

-1 

.93 

-1.74 

-1.84 

-1.90 

-1.96 

-1.27 

-0.92 

-1.50 

Noon.    -1.21 

-1.77  -1.97  -2. 

16  -2 

24 

-2.51 

-2.26 

-2.34 

-2.45 

-2.61 

-1.77 

-1.28 

-2.05 

1       -1.73 

-2.36 

-2.45  -2.86  -2.71  -3.06  -2.66 

-2.67 

-2.88 

-3.14 

-2.26 

-1.63 

-2.53 

2 

-2.04 

-2.66 

-2.74  -3. 

29  -3 

11 

9 

.32  -2.97 

-3.01 

-3.22 

-3.45 

-2.52 

-1.84 

-2.85 

3       -2.10 

-2.82  -3.07  -3. 

42 

-3.36 

-3 

.40  -3.15 

-3.11 

-3.26 

-3.45 

-2.48 

-1.85 

-2.96 

4       -1.98  -2.69  -2.99  -3. 

44 

-3 

46   -3 

.44  -3.06 

-2.98 

-3.17 

-3.33 

-2.24 

-1.63 

-2.87 

5       -1.30  -2.18  -2.52  -3. 

14 

-3.26  -3 

.05 

-2.94 

-2.70 

-2.77 

-2.46 

-1.-4C 

-1.10 

-2.41 

6 

-0.91 

-1.37 

-1.60-2. 

49 

-2 

46 

-2 

.47 

-2.30 

-2.03 

-1.77 

-1.33 

-0.82 

-0.64 

-1.68 

7 

-0.51 

-0.80  -0.88-1. 

23  -1 

23 

-1 

.38  -1.44 

-1.02 

-0.76 

-0.52 

-0.33 

-0.31 

-0.87 

8 

-0.20  -0.21 

-0.20  -0. 

29  -0.06 

0.06     0.03 

0.01 

0.28 

0.18 

-0.14 

-0.04 

-0.05 

9 

0.07 

0.11 

0.90 

0. 

35     0.65 

0.82 

0.57 

0.60 

0.81 

0.65 

0.29 

0.09 

0.49 

10 

0.33     0.48 

0.77 

0. 

93 

1 

24 

1.37 

1.08 

1.09 

1.33 

1.24 

0.45 

0.27 

0.88 

11 

:    0.56 

0.75 

0.96 

1. 

44 

1 

74 

1 

.91 

1.55 

1.44 

1.64 

1.63 

0.79 

0.40  ; 

1.23 

Mean. 

0.30 

1.12 

5.18 

8.75 

12 

18 

16 

.22 

18.19    17.52 

14.66 

8.72  |  3.67      0.58 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

15 


NORTH  AMERICA.  —  PHILADELPHIA. 


III. 

Lat.  39°  58'  N. 


Long.  75°  ll'W.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  GUYOT. 

Degrees  of  Fahrenheit. 


Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midnight. 

1.47 

2.90 

2.90 

4.13 

4.68 

5.28 

4.70 

4.37 

4.47 

3.80 

2.70 

1.40 

3.57 

1 

2.13 

3.37 

3.63 

4.88 

5.25 

5.93 

5.57 

4.93 

4.60 

4.17 

2.73 

1.83 

4.08 

2 

2.20 

3.57 

4.17 

5.88 

5.95 

6.45 

6.10 

5.43 

5.00 

4.87 

3.20 

2.20 

4.59 

3 

2.57 

4.43 

4.50 

6.28 

6.68 

7.23 

6.53 

5.50 

5.47 

5.27 

3.37 

2.53 

5,03 

4 

2.80 

4.67 

4.70 

6.75 

7.38 

7.68 

6.90 

6.17 

5.77 

5.77 

3.90 

2.87 

5.45 

5 

3.07 

4.83 

5.63 

6.95 

7.48 

7.40 

7.03 

6.50 

6.03 

6.23 

4.10 

3.10 

5.70 

6 

3.40 

5.10 

5.50 

6.45 

5.93 

5.73 

5.80 

5.93 

5.97 

6.60 

4.23 

3.23 

5.32 

7 

3.63 

5.17 

5.03 

4.90 

3.80 

3.28 

3.50 

4.13 

4.33 

5.37 

4.20 

3.07 

4.20 

8 

3.17 

3.33 

2.80 

2.50 

1.48 

0.90 

1.27 

1.50 

1.93 

2.40 

2.70 

2.57 

2.16 

9 

1.77 

L33 

0.80 

0.58 

-0.85 

-1.15 

-0.77 

-0.43 

-0.40 

-0.37 

0.57 

1.17 

0.19 

10 

0.07 

-0.83 

-1.03 

-1.53 

-2.38 

-2.75 

-2.20 

-2.37 

-2.43 

-2.67 

-1.27 

-0.50 

-1.66 

11 

-1.40 

-2.63 

-3.10 

-3.40 

-3.90 

-4.33 

-3.87 

-4.13 

-4.27 

-4.43 

-2.87 

-2.07 

-3.62 

Noon. 

-2.70 

-3.93 

-4.43 

-4.72 

-5.03 

-5.63 

-5.03 

-5.27 

-5.50 

-5.90 

-4.00 

-2.87 

-4.58 

1 

-3.87 

-5.27 

-5.50 

-6.38 

-6.08 

-6.88 

-5.93 

-6.00 

-6.47 

-7.10 

-5.10  -3.67 

-5.69 

2 

-4.57 

-5.97 

-6.17 

-7.12 

-6.98 

-7.45 

-6.63 

-6.83 

-7.20 

-7.80  -5.67  -4.13  -6.40 

3 

-4.70 

-6.30 

-6.90 

-7.63 

-7.55 

-7.63 

-7.03 

-7.00 

-7.33 

-7.80 

-5.60 

-4.17 

-6.64 

4 

-4.43 

-6.00 

-6.73 

-7.65 

-7*.78 

-7.73 

-6.83 

-6.70 

-7.13 

-7.53 

-5.07 

-3.67 

-6.44 

5 

-2.90 

-4.87 

-5.67 

-7.00 

-7.331  -6.85!  -6.57 

-6.07 

-6.23 

-5.57 

-3.30 

-2.47  -5.40 

6 

-2.03 

-3.03 

-3.60 

-5.55 

-5.53  -5.55J  -5.13 

-4.57 

-3.97 

-3.03 

-1.87 

-1.43  -3.77 

•    7 

-1.13 

-1.77 

-1.97 

-2.70 

-2.88 

-3.10 

-3.20 

-2.30 

-1.70 

-1.20 

-0.77 

-0.70 

-1.95 

8 

-0.43 

-0.43 

-0.43 

-0.60 

-0.13 

0.15 

0.08 

0.03 

0.63 

0.37 

0.15 

-0.10 

-0.11 

9 

0.17 

0.30 

0.73 

0.85 

1.48 

1.85 

1.33 

1.37 

1.83 

1.43 

0.63 

0.20 

1.01 

10 

0.77 

1.13 

1.73 

2.15 

2.80 

X  3.10 

2.47 

2.47 

3.00 

2.77 

1.00 

0.60 

2.00 

11 

1.27 

1.73 

2.17 

3.30 

3.93 

4.30 

3.53 

3.23 

3.70 

3.63 

1.77 

0.90 

2.78 

6,  6 

0.69 

1.04 

0.95 

0.45 

0.20 

0.09 

0.34 

0.68 

1.00 

1.79 

1.18 

0.90 

0.78 

7,7 

1.25 

1.70 

1.53 

1.10 

0.46 

0.09 

0.15 

0.92 

1.32 

2.09 

1.72 

1.19 

1.13 

8,  8 

1.37 

1.45 

1.18 

0.85 

0.68 

0.53 

0.67 

0.77 

1.01 

1.38 

1.35 

1.24 

1.04 

9,  9 

0.97 

0.82 

0.76 

0.72 

0.32 

0.35 

0.28 

0.47 

0.72 

0.53 

0.60 

0.69 

0.66 

10,  10 

0.42 

0.15 

0.35 

0.31 

0.21 

0.18 

0.14 

0.05 

0.29 

0.05 

-0.13 

0.05 

0.17 

7,2,9 

-0.22 

-0.17 

-0.15 

-0.53 

-0.57 

-0.77 

-0.61 

-0.44 

-0.35 

-0.33 

-0.28 

-0.29 

-0.39 

6,2,8 

-0.53 

-0.43 

-0.37 

-0.42 

-0.39 

-0.52 

-0.37 

-0.29 

-0.20 

-0.28 

-0.43 

-0.67 

-0.41 

6,  2,  10 

-0.13 

0.09 

0.53 

0.74 

0.58 

0.46 

0.55 

0.52 

0.59 

0.52 

-0.15 

-0.10 

0.44 

6,2,6 

-1.07 

-0.72 

-1.42 

-2.07 

-2.19 

-2.42 

-1.43 

-1.82 

-1.73 

-1.41 

-1.10 

-0.78 

-1.44 

7,2 

-0.47 

-0.40 

-0.57 

-1.11 

-1.59 

-2.09 

-1.57 

-1.35 

-1.44 

-1.22  -0.74 

-0.53 

-1.09 

8,2 

-0.70-1.32 

-1.68 

-2.31 

-2.75 

-3.28 

-2.68 

-2.67 

-2.90 

-2.70-1.49 

-0.78 

-2.10 

8,1 

-0.35 

-0.97 

-1.35 

-1.94 

-2.30 

-2.99 

-2.33 

-2.25 

-2.53 

-2.35 

-1.20 

-0.55 

-1.76 

7,  1 

-0.12 

-0.05 

-0.24 

-0.74 

-1.14 

-1.80 

-1.22 

-0.94 

-1.07 

-0.87 

-0.45 

-0.30 

-0.75 

9,12,3,9 

-1.37-2.15 

-2.45  -2.73 

-2.99 

-3.14  -2.88  -2.83  -2.85  -3.16  -2.39  -1.42 

-2.53 

E 


16 


IV. 

N.  AMERICA.  —  FRANKFORT  ARSENAL.    Lett.  39°  57'  N.     Long.  75°  8'  W.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 

Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

1.34 

1.46 

1.75 

1.87 

2.60 

3.41 

3.07 

2.69 

2.63 

2.40 

1-18 

1.34 

2.15 

2 

1.51 

1.73 

2.13 

2.33 

3.05 

3.73 

3.51 

3.04 

3.05 

2.67 

1.27 

1.50 

2.46 

3 

1.82 

1.98 

2.56 

2.88 

3.43 

3.92 

3.83 

3.32 

3.49 

2.94 

1.41 

1.66 

2.77 

4 

2.13 

2.23 

2.90 

3.29 

3.57 

3.84 

3.84 

3.36 

3.73 

3.13 

1.51 

1.80 

2.94 

5 

2.31 

2.46 

2.95 

3.31 

3.32 

3.36 

3.40 

2.99 

3.54 

3.12 

1.73 

1.87 

2.86 

6 

2.25 

2.35 

2.62 

2.83 

2.65 

2.46 

2.52 

2.21 

2.84 

2.82 

1.38 

1.80 

2.39 

7 

1.88 

2.01 

1.91 

1.94 

1.66 

1.26 

1.34 

1.15 

1.71 

2.19 

1.06 

1.52 

1.64 

8 

1.22 

1.33 

0,94 

0.85 

0.57 

-0.03 

0.08 

0.01 

0.36 

1.26 

0.58 

0.97 

0.68 

9 

0.34 

0.30 

-0.07 

-0.20 

-0.45 

-1.20 

-1.06 

-1.00 

-0.96 

0.12 

-0.02 

0.18 

-0.34 

10 

-0.62 

-0.72 

-1.00 

-1.05 

-1.29 

-2.11 

-1.96 

-1.78 

-2.06 

-1.13 

-0.70 

-0.76 

-1.27 

11 

-1.54 

-1.77 

-1.76 

-1.69 

-1.97 

-2.74 

-2.64 

-2.34 

-2.89 

-2.33 

-1.12 

-1.70 

-2.04 

Noon.  .  . 

-2.30 

-2.60 

-2.32 

-2.22 

-2.35 

-3.17 

-3.16 

-2.78 

-3.47 

-3.35 

-1.96 

-2.45 

-2.68 

1 

-2.85 

-3.01 

-2.74 

-2.72 

-3.07 

-3.51 

-3.58 

-3.16 

-3.86 

-4.05 

-2.38 

-2.87 

-3.15 

2 

-3.02 

-3.18 

-3.01 

-3.19 

-3.52 

-3.77 

-3.87 

-3.48 

-4.07 

-4.36 

-2.54 

-2.89 

-3.41 

3 

-2.92 

-2.93 

-3.10 

-3.53 

-3.78 

-3.89 

-3.94 

-3.61 

-4.02 

-4.22 

-2.40 

-2.54 

-3.41 

4 

—2.53 

-2.44 

-2.95 

-3.55 

-3.70 

-3.75 

-3.67 

-3.42 

r3.63 

-3.66 

-1.96 

-1.94 

-3.10 

5 

-1.90 

-1.87 

-2.50 

-3.11 

-3.20 

-3.23 

-3.00 

-2.81 

-2.84 

-2.75 

-1.52 

-1.23 

-2.50 

6 

-1.14 

-1.11 

-1.78 

-2.23 

-2.31 

-2.33 

-2.00 

-1.83 

-1.72 

-1.65 

-0.56 

-0.55 

-1.60 

7 

-0.37 

-0.46 

-0.92 

-1.09 

-1.19 

-1.16 

-0.83 

-0.67 

-0.48 

-0.54 

0.14 

0.01 

-0.63 

8 

0.29 

0.12 

-0.06 

0.02 

-0.10 

0.07 

0.28 

0.43 

0.66 

0.43 

0.69 

0.42 

0.27 

9 

0.76 

0.66 

0.61 

0.85 

0.80 

1.17 

1.17 

1.29 

1.49 

1.17 

1.02 

0.71 

0.98 

10 

1.02 

0.93 

1.05 

1.32 

1.43 

2.02 

1.79 

1.84 

1.96 

1.66 

1.15 

0.90 

1.42 

11 

1.13 

1.18 

1.31 

1.50 

1.85 

2.61 

2.24 

2.15 

2.18 

1.96 

0.91 

1.06 

1.67 

Midn.  .  . 

1.19 

1.36 

1.48 

1.62 

2.01 

3.04 

2.63 

2.40 

2.35 

2.18 

1.15 

1.20 

1.88 

6.  6 

0.56 

0.62 

0.42 

0.30 

0.17 

0.07 

0.26 

0.19 

0.56 

0.58 

0.41 

0.62 

0.40 

7.  7 

0.76 

0.78 

0.50 

0.42 

0.24 

0.05 

0.26 

0.24 

0.62 

0.83 

0.60 

0.76 

0.51 

8.  8 

0.76 

0.72 

0.44 

0.43 

0.24 

0.02 

0.18 

0.22 

0.51 

0.85 

0.63 

0.70 

0.48 

9.  9 

0.55 

0.48 

0.27 

0.33 

0.18 

-0.02 

0.06 

0.14 

0.26 

0.64 

0.50 

0.44 

0.32 

10.10 

0.20 

0.11 

0.03 

0.13 

0.07 

-0.05 

-0.08 

0.03 

-0.05 

0.26 

0.23 

0.07 

0.08 

7.  2.  9 

-0.13 

-0.17 

-0.16 

-0.13 

-0.35 

-0.45 

-0.45 

-0.35 

-0.29 

-0.33 

-0.15 

-0.22 

-0.27 

6.  2.  8 

-0.16 

-0.24 

-0.15 

-0.11 

-0.32 

-0.41 

-0.36 

-0.28 

-0.19 

-0.37 

-0.16 

-0.22 

-0.25 

6.  2.10 

0.08 

0.03 

0.22 

0.32 

0.19 

0.24 

0.15 

0.19 

0.24 

0.04 

0.00 

-0.06 

0.14 

6.  2.  6 

-0.64 

-0.65 

-0.72 

-0.86 

-1.06 

-1.21 

-1.12 

-1.03 

-0.98 

-1.06 

-0.57 

-0.55 

-0.87 

7.  2 

-0.57 

-0.59 

-0.55 

-0.63 

-0.93 

-1.26 

-1.27 

-1.17 

-1.18 

-1.09 

-0.74 

-0.69 

-0.89 

8.  2 

-0.90 

-0.93 

-1.04 

-1.17 

-1.48 

-1.90 

-1.90 

-1.74 

-1.86 

-1.55 

-0.98 

-0.96 

-1.37 

8.  1 

-0.82 

-0.84 

-0.90 

-0.94 

-1.25 

-1.77 

-1.75 

-1.58 

-1.75 

-1.40 

-0.90 

-0.95 

-1.24 

7.  1 

-0.49 

-0.50 

-0.42 

-0.39 

-0.71 

-1.13 

-1.12 

-1.10 

-1.08 

-0.93 

-0.66 

-0.68 

-0.76 

9.12.3.9 

-1.03 

-1.14 

-1.22 

-1.28 

-1.45 

-1.77 

-1.75 

-1.53 

-1.74 

-1.57 

-0.84 

-1.03 

-1.36 

7.  2.2(9) 

0.10 

0.04 

-0.03 

0.11 

-0.07 

-0.04 

-0.05 

0.06 

0.16 

0.04 

0.14 

0.01 

0.04 

Bail.  ext. 

-0.36 

-0.36 

-0.08 

-0.12 

-0.11 

0.02 

-0.05 

-0.13 

-0.17 

-0.62 

-0.41 

-0.51 

-0.24 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

17 


V. 

N.  AMERICA.  —  FRANKFORT  ARSENAL.    Lat.  39°  57'  N.    Long.  75°  8'  W.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Fahrenheit. 


Hours. 

Jan. 

Feb. 

March 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

3.02 

3.29 

3.94 

4.21 

5.85 

7.67 

6.91 

6.05 

5.92 

5.40 

2.66 

3.02 

1 
4.84 

2 

3.40 

3.89 

4.79 

5.24 

6.86 

8.39 

7.90 

6.84 

6.86 

6.01 

2.86 

3.38 

5.54 

3 

4.10 

4.46 

5.76 

6.48 

7.72 

8.82 

8.62 

7.47 

7.85 

6.62 

3.17 

3.74 

6.23 

4 

4.79 

5.02 

6.53 

7.40 

8.03 

8.64 

8.64 

7.56 

8.39 

7.04 

3.40 

4.05 

6.62 

5 

5.20 

5.54 

6.64 

7.45 

7.74 

7.56 

7.65 

6.73 

7.97 

7.02 

3.89 

4.21 

6.44 

6 

5.06 

5.29 

5.90 

6.37 

5.96 

5.54 

5.67 

4.97 

6.39 

6.35 

3.11 

4.05 

5.38 

7 

4.23 

4.52 

4.30 

4.37 

3.74 

2.84 

3.02 

2.59 

3.85 

4.93 

2.39 

3.42 

3.69 

8 

2.75 

2.99 

2.12 

1.91 

1.28 

-0.07 

0.18 

0.02 

0.81 

2.84 

1.31 

2.18 

1.53 

9 

0.77 

0.68 

-0.16 

-0.45 

-1.01 

-2.70 

-2.39 

-2.25 

-2.16 

0.27 

-0.05 

0.41 

-0.77 

10 

-1.40 

-1.62 

-2.25 

-2.36 

-2.90 

-4.75 

-4.41 

-4.01 

-4.64 

-2.54 

-1.58 

-1.71 

-2.86 

11 

-3.47 

-3.98 

-3.96 

-3.80 

-4.43 

-6.17 

-5.94 

-5.27 

-6.50 

-5.24 

-2.52 

-3.83 

-4.59 

Noon.  .  . 

-5.18 

-5.85 

-5.22 

-5.00 

-5.29 

-7.13 

-7.11 

-6.26 

-7.81 

-7.54 

-4.41 

-5.51 

-6.03 

1 

-6.41 

-6.77 

-6.17 

-6.12 

-6.91 

-7.90 

-8.06 

-7.11 

-8.69 

-9.11 

-5.36 

-6.46 

-7.09 

2 

-6.80 

-7.16 

-6.77 

-7.18 

-7.92 

-8.48 

-8.71 

-7.83 

-9.16 

-9.81 

-5.72 

-6.58 

-7.67 

3 

-6.57 

-6.59 

-6.98 

-7.94 

-8.51 

-8.75 

-8.87 

-8.12 

-9.05 

-9.50 

-5.40 

-5.72 

-7.67 

4 

-5.69 

-5.49 

-6.64 

T7.99 

-8.33 

-8.44 

-8.26 

-7.70 

-8.17 

-8.24 

-4.41 

-4.37 

-6.98 

5 

-4.28 

-4.21 

-5.63 

-7.00 

-7.20 

-7.27 

-6.75 

-6.32 

-6.39 

-6.19 

-3.42 

-2.77 

-5.63 

6 

-2.57 

-2.50 

-4.01 

-5.02 

-5.20 

-5.24 

-4.50 

-4.12 

-3.87 

-3.71 

-1.26 

-1.24 

-3.60 

7 

-0.83 

-1.04 

-2.07 

-2.45 

-2.68 

-2.61 

-1.87 

-1.51 

-1.08 

-1.22 

0.32 

0.02 

-1.42 

8 

0.65 

0.27 

-0.14 

0.05 

-0.23 

0.16 

0.63 

0.97 

1.49 

0.97 

1  55 

0;95 

0.61 

9 

1.71 

1.48 

1.37 

1.91 

1.80 

2.63 

2.63 

2.90 

3.35 

2.63 

2.30 

1.60 

2.21 

10 

2.30 

2.09 

2.36 

1.97 

3.22 

4.55 

4.03 

4.14 

4.41 

3.74 

2.59 

2.03 

3.20 

11 

2.54 

2.66 

2.95 

3.38 

4.16 

5.87 

5.04 

4.84 

4.91 

4.41 

2.05 

2.39 

3.76 

Midn.  .  . 

2.68 

3.06 

3.33 

3.65 

4.52 

6.84 

5.92 

5.40 

5.29 

4.91 

2.59 

2.10 

4.23 

6.  6 

1.26 

1.40 

0.95 

0.68 

0.38 

0.16 

0.59 

0.43 

1.26 

1.31 

0.92 

1.40 

0.90 

7.  7 

1.71 

1.76 

1.13 

0.95 

0.54 

0.11 

0.59 

0.54 

1.40 

1.87 

1.35 

-1.71 

1.15 

3.  8 

1.71 

1.62 

0.99 

0.97 

0.54 

0.05 

0.41 

0.50 

1.15 

1.91 

1.42 

1.58 

1.08 

9.  9 

1.24 

1.08 

0.61 

0.74 

0.41 

-0.05 

0.14 

0.32 

0.59 

1.44 

1.13 

0.99 

0.72 

10.10 

0.45 

0.25 

0.07 

0.29 

0.16 

-0.11 

-0.18 

0.07 

-0.11 

0.59 

0.52 

0.16 

0.18 

7.  2.  9 

-0.29 

-0.38 

-0.36 

-0.29 

-0.79 

-1.01 

-1.01 

-0.79 

-0.65 

-0.74 

-0.34 

-0.50 

-0.61 

6.  2.  8 

-0.36 

-zO.54 

-0.39 

-0.25 

-0.72 

-0.92 

-0.81 

-0.63 

-0.43 

-0.83 

-0.36 

-0.50 

-0.56 

6.  2.10 

0.18 

0.07 

0.50 

0.72 

0.43 

0.54 

0.34 

0.43 

0.54 

0.09 

0.00 

-0.14 

0.32 

6.  2.  6 

-1.44 

-1.46 

-1.62 

-1.94 

-2.39 

-2.72 

-2.52 

-2.32 

-2.21 

-2.39 

-1.28 

-1.24 

-1.96 

7.  2 

-1.28 

-1.33 

-1.24 

-1.42 

-2.09 

-2.84 

-2.86 

-2.63 

-2.66 

-2.45 

-1.67 

—1.55 

-2.00 

8.  2 

-2.03 

-2.09 

-2.34 

-2.63 

-3.33 

-4.28 

-4.28 

-3.92 

-4.19 

-3.49 

-2.21 

-2.16 

-3.08 

8.  1 

-1.85 

-1.89 

-2.03 

-2.12 

-2.81 

-3.9S 

-3.94 

-3.56 

-3.94 

-3.75 

-2.03 

-2.14 

-2.79 

7.  2 

rl.10 

-1.13 

-0.95 

-0.88 

-1.60 

-2.54 

-2.52 

-2.27 

-2.43 

-2.09 

-1.49 

-1.53 

-1.71 

9.12.3.9 

-2.32 

-2.57 

-2.75 

-2.88 

-3.26 

-3.98 

-3.94 

-3.44 

-3.92 

-3.53 

-1.89 

-2.32 

-3.06 

7.  2.2(9) 

0.23 

0.09 

0.07 

0.25 

-0.16 

-0.09 

-0.11 

0.14 

0.36 

0.09 

.0.32 

0.02 

0.09 

Dail.ext. 

-0.81 

-0.81 

-0.18 

-0.27J-0.25 

0.04 

-0.11 

-0.29 

-0.38 

-1.39 

-0.92 

-1.15 

-0.54 

The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

18 


VI. 

N.  AMERICA.  —  TORONTO.     Lat.  43°  39'  35"  N.    Long.  79°  21'  30"  W.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Fahrenheit. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

4 

Morn.  1 

1.87 

0.92 

3.04 

4,43 

5.90 

5.94 

6.30 

5.06 

5.74 

4.16 

1.91 

1.04 

3.87 

2 

2.16 

1.33 

3.56 

5.11 

6.64 

6.62 

7.13 

5.68 

6.68 

4.68 

2.14 

1.13 

4.41 

3 

2.39 

1.91 

4.19 

5.76 

7.36 

7.29 

8.01 

6.82 

7.63 

5.04 

2.39 

1.40 

5.02 

4 

2.68 

2.66 

4.75 

6.17 

7.65 

7.56 

8.44 

7.61 

8.19 

5.20 

2.61 

1.78 

5.45 

5 

3.02 

3.40 

4.95 

5.94 

7.07 

6.98 

7.88 

7.49 

7.94 

5.02 

2.68 

2.16 

5.38 

6 

3.29 

3.92 

4.61 

4.97 

5.49 

5.38 

6.14 

6.14 

6.71 

4.48 

2.52 

2.39 

4.68 

7 

3.26 

3.98 

3.65 

3.38 

3.17 

3.04 

3.49 

3.67 

4.52 

3.44 

2.05 

2.27 

3.33 

8 

2.72 

3.40 

2.12 

1.42 

0.68 

0.43 

0.52 

0.68 

1.78 

1.91 

1.15 

1.71 

1.55 

9 

1.58 

2.33 

0.29 

-0.50 

-1.51 

-1.85 

-2.12 

-2.09 

-1.06 

-0.05 

-0.07 

0.79 

-0.36 

10 

0.00 

0.61 

-1.60 

-2.07 

-3.08 

-3.47 

-4.01 

-4.14 

-3.62 

-2.25 

-1.46 

-0.34 

-2.12 

11 

-1.71 

-1.15 

-3.26 

-3.26 

-4.14 

-4.46 

-5.15 

-5.33 

-5.72 

-4.39 

-2.79 

-1.44 

-3.58 

Noon.  .  . 

-3.11 

-2.66 

-4.55 

-4.19 

-5.00 

-5.18 

-5.90 

-5.96 

-7.25 

-6.12 

-3.78 

-2.30 

-4.66 

1 

-3.89 

-3.67 

-5.36 

-5.00 

-5.99 

-5.94 

-6.59 

-6.50 

-8.33 

-7.11 

-4.28 

-2.77 

-545 

2 

-3.98 

-4.07 

-5.72 

-5.76 

-7.16 

-6.89 

-7.47 

-7.11 

-8.89 

-7.25 

-4.14 

-2.86 

-594 

3 

-3.53 

-3.92 

-5.60 

-6.35 

-8.15 

-7.74 

-8.28 

-7.70 

-8.87 

-6.53 

-3.51 

-2.66 

.-6.08 

4 

-2.84 

-3.38 

-5.02 

-6.48 

-8.51 

-8.08 

-8.55 

-7.81 

-8.12 

-5.18 

-2.52 

-2.23 

-5.72 

5 

-2.14 

-2.63 

-4.03 

-5.94 

-7.76 

-7.43 

-7.83 

-6.95 

-6.59 

-3.53 

-1.44 

-1.71 

-4.84 

6 

-1.62 

-1.89 

-2.75 

-4.66 

-5.83 

-5.65 

-5.94 

-5.00 

-4.43 

-1.91 

-0.45 

-1.13 

-3.44 

7 

-1.24 

-1.24 

-1.31 

-2.81 

-3.08 

-3.04 

-3.17 

-2.25 

-1.94 

-0-50 

0.32 

-0.54 

-1.73 

8 

-o.ss 

-0.68 

0.05 

-0.77 

-0.16 

-0.18 

-0.18 

0.65 

0.43 

0.65 

0.86 

0.02 

-0.02 

9 

-0.43 

-0-25 

1.15 

1.06 

2.30 

2.30 

2.39 

2.97 

2.30 

1.53 

1.17 

0.47 

1.42 

10 

0.16 

0.11 

1.89 

2.41 

3.94 

3.98 

4.14 

4.32 

3.58 

2.25 

1.37 

0.81 

2.41 

11 

0.83 

0.38 

2.34 

3.26 

4.82 

4.93 

5.11 

4.77 

4.37 

2.90 

1.53 

0.97 

3.02 

Midn.  .  . 

1.42 

0.63 

2.66 

3.85 

5.33 

5.45 

5.64 

4.84 

5.00 

3.56 

1.71 

1.01 

3.42 

6.  6 

0.83 

1.01 

0.95 

0.16 

-0.18 

0.14 

0.11 

0.56 

1.13 

1.28 

1.04 

0.63 

0.61 

7.  7 

1.01 

1.27 

1.17 

0.29 

-0.05 

0.00 

0.16 

0.72 

1.28 

1.49 

1.19 

0.86 

0.81 

8.  8 

0.92 

1.37 

1.08 

0.34 

0.27 

0.14 

0.16 

0.68 

1.10 

1.28 

1.01 

0.86 

0.77 

9.  9 

0.59 

0.99 

0.72 

0.29 

0.41 

0.23 

0.14 

0.45 

0.63 

0.74 

0.56 

0.63 

0.54 

10.10 

0.07 

0.36 

0.14 

0.16 

0.43 

0.27 

0.07 

0.09 

-0.02 

0.00 

-0.05 

0.23 

0.14 

7.  2.  9 

-0.38 

-0.11 

-0.32 

-0.45 

-0.56 

-0.52 

-0.54 

-0.16 

-0.70 

-0.77 

-0.32 

-0.05 

-0.41 

6.  2.  8 

-0.52 

-0.27 

-0.36 

-0.52 

-0.61 

-0.56 

-0.50 

-0.11 

-0.59 

-0.70 

-0.25 

-0.16 

-0.43 

6.  2.10 

-0.18 

-0.02 

0.27 

0.54 

0.77 

0.83 

0.95 

1.13 

0.47 

-0.18 

-0.09 

0.11 

0.38 

6.  2.  6 

-0.77 

-0.68 

-1.28 

-1.82 

-2.50 

-2.39 

-2.43 

-1..98 

-2.21 

-1.55 

-0.70 

-0.54 

-1.58 

7.  2 

-0.36 

-0.05 

-1.04 

-1.19 

-2.00 

-1.94 

-2.00 

-1.73 

-2.18 

-1.91 

-1.06 

-0.29 

-1.31 

8.  2 

-0.63 

-0.34 

-1.80 

-2:i8 

-3.24 

-3.24 

-3.49 

-3.22 

-3.56 

-2.68 

-1.51 

-0.59 

-221 

8.  1 

-0.59 

-0.14 

-1.62 

-1.80 

-2.66 

-2.77 

-3.04 

-2.93 

-3.29 

-2.61 

-1.58 

-0.54 

-1.96 

7.  1 

-0.32 

0.16 

-0.86 

-0.81 

-1.42 

-1.46 

-1.55 

-1.42 

-1.91 

-1.85 

-1.13 

-0.25 

-1.06 

9.12.3.9 

-1.37 

-1.15 

-2.18 

-2.50 

-3.08 

-3.13 

-3.49 

-3.20 

-3.71 

-2.79 

-1.55 

-0.92 

-2.43 

7.  2.2(9) 

-0.41 

-0.16 

0.07 

-0.07 

0.16 

0.18 

0.20 

0.63 

0.07 

-0.18 

0.07 

0.09 

0.05 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

19 


VII. 

N.  AMERICA.  —  TORONTO.     Lat.  43°  39'  35"  N.  -Long.  79°  21'  30"  W.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 

Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year. DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.83 

0.41 

1.35 

1.97 

2.62 

2.64 

2.80 

2.25 

2.55 

1.85 

0.85 

0.46 

1.72 

2 

0.96 

0.59 

1-58 

2-27 

2.95 

2.94 

3.17 

2.57 

2.97 

2.08 

0.95 

0.50 

1.96 

3 

1.06 

0.85 

1.86 

2.56 

3.27 

3.24 

3.56 

3.03 

3.39 

2.24 

1.06 

0.62 

2.23 

4 

1.19 

1.18 

2.11 

2.74 

3.40 

3.36 

3.75 

3.38 

3.64 

2.31 

1.16 

0.79 

2.42 

5 

1.34 

1.51 

2.20 

2.64 

3.14 

3.10 

3.50 

3.33 

3.53 

2.23 

1.19 

0.96 

2.39 

6 

1.46 

1.74 

2.05 

2.21 

2.44 

2.39 

2.73 

2.73 

2.98 

1.99 

1.12 

1.06 

2.08 

7 

1.45 

1.77 

1.62 

1.50 

1.41 

1.35 

1.55 

1.63 

2.01 

1.53 

0.91 

1.01 

1.48 

8 

1.21 

1.51 

0.94 

0.63 

0.30 

0.19 

0.23 

0.30 

0.79 

0.85 

0.51 

0.76 

0.69 

9 

0.70 

0.99 

0.13 

-0.22 

-0.67 

-0.82 

-0.94 

-0.93 

-0.47 

-0.02 

-0.03 

0.35 

-0.16 

10 

-0.00 

0.27 

-0.71 

-0.92 

-1.37 

-1.54 

-1.78 

-1.84 

-1.61 

-1.00 

-0.65 

-0.15 

-0.94 

11 

-0.76 

-0.51 

-1.45 

-1.45 

-1.84 

-1.98 

-2.29 

-2.37 

-2.54 

-1.95 

-1.24 

-0.64 

-1.59 

Noon.  .  . 

-1.38 

-1.18 

-2.02 

-1.86 

-2.22 

-2.30 

-2.62 

-2.65 

-3.22 

-2.72 

-1.68 

-1.02 

-2.07 

1 

-1.73 

-1.63 

-2.38 

-2.22 

-2.66 

-2.64 

-2.93 

-2.89 

-3.70 

-3.16 

-1.90 

-1.23 

-2.42 

2 

-1.77 

-1.81 

-2.54 

-2.56 

-3.18 

-3.06 

-3.32 

-3.16 

-3.95 

-3.22 

-1.84 

-1.27 

-2.64 

,3 

-1.57 

-1.74 

-2.49 

-2.82 

-3.62 

-3.44 

-3.68 

-3.42 

-3.94 

-2.90 

-1.56 

-1.18 

-2.70 

4 

-1.26 

-1.50 

-2.23 

-2.88 

-3.78 

-3.59 

-3.80 

-3.47 

-3.61 

-2.30 

-1.12 

-0.99 

-2.54 

5 

-0.95 

-1.17 

-1.79 

-2.64 

-3.45 

-3.30 

-3.48 

-3.09 

-2.93 

-1.57 

-0.64 

-0.76 

-2.15 

6 

-0.72 

-0.84 

-1.22 

-2.07 

-2.59 

-2.51 

-2.64 

-2.22 

-1.97 

-0.85 

-0.20 

-0.50 

-1.53 

7 

-0.55 

-0.55 

-0.58 

-1.25 

-1.37 

-1.35 

-1.41 

-1.00 

-0.86 

-0.22 

0.14 

-0.24 

-0.77 

8 

-0.39 

-0.30 

0.02 

-0.34 

-0.07 

-0.08 

-0.08 

0.29 

0.19 

0.29 

0.38 

0.01 

-0.01 

9 

-0.19 

-0.11 

0.51 

0.47 

1.02 

1.02 

1.06 

1.32 

1.02 

0.68 

0.52 

0.21 

0.63 

10 

0.07 

0.05 

0.84 

1.07 

1.75 

1.77 

1.84 

1.92 

1.59 

1.00 

0.61 

0.36 

1.07 

11 

0.37 

0.17 

1.04 

1.45 

2.14 

2.19 

2.27 

2.12 

1.94 

1.29 

0.68 

0.43 

1.34 

Midn.  .  . 

0.63 

0.28 

1.18 

1.71 

2.37 

2.42 

2.53 

2.15 

2.22 

1.58 

0.76 

0.45 

1.52 

6.  6 

0.37 

0.45 

0.42 

0.07 

-0.08 

-0.06 

0.05 

0.25 

0.50 

0.57 

0.46 

0.28 

0.27 

7.  7 

0.45 

0.61 

0.52 

0.13 

0.02 

0.00 

0.07 

0.32 

0.57 

0.66 

0.53 

0.38 

0.36 

8.  8 

0.41 

0.61 

0.48 

0.15 

0.12 

0.06 

0.07 

0.30 

0.49 

0.57 

0.45 

0.38 

0.34 

9.  9 

0.26 

0.44 

0.32 

0.13 

0.18 

0.10 

0.06 

0.20 

0.28 

0.33 

0.25 

0.28 

0.24 

10.10 

0.03 

0.16 

0.06 

0.07 

0.19 

0.12 

0.03 

0.04 

-0.01 

0.00 

-0.02 

0.10 

0.06 

7.  2.  9 

-0.17 

-0.05 

-0.14 

-0.20 

-0.25 

-0.23 

-0.24 

-0.07 

-0.31 

-0.34 

-0.14 

-0.02 

-0.18 

6.  2..  8 

-0.23 

-0.12 

-0.16 

-0.23 

-0.27 

-0.25 

-0.22 

-0.05 

-0.26 

-0.31 

-0.11 

-0.07 

-0.19 

6.  2.10 

-0.08 

-0.01 

0.12 

0.24 

0.34 

0.37 

0.42 

0.50 

0.21 

-0.08 

-0.04 

0.05 

0.17 

6.  2.  6 

-0.34 

-0.30 

-0.57 

-0.81 

-1.11 

-1.06 

-1.08 

-0.88 

-0.98 

-0.69 

-0.31 

-0.24 

-0.70 

7.  2 

-0.16 

-0.02 

-0.46 

-0.53 

-0.89 

-0.86 

-0.89 

-0.77 

-0.97 

-0.85 

-0.47 

-0.13 

-0.58 

8.  2 

-0.28 

-0.15 

-0.80 

-0.97 

-1.44 

-1.44 

-1.55 

-1.43 

-1.58 

-1.19 

-0.67 

-0.26 

-0.98 

8.  1 

-0.26 

-0.06 

-0.72 

-0.80 

-1.18 

-1.23 

-1.35 

-1.30 

-1.46 

-1.16 

-0.70 

-0.24 

-0.87 

7.  1 

-0.14 

0.07 

-0.38 

-0.36 

-0.63 

-0.65 

-0.69 

-0.63 

-0.85 

-0.82 

-0.50 

-0.11 

-0.47 

9.12.3.9 

-0.61 

-0.51 

-0.97 

-1.11 

-1.37 

-1.39 

-1.55 

-1.42 

-1.65 

-1.24 

-0.69 

-0.41 

-1.08 

7.  2.2(9) 

-0.18 

-0.07 

0.03 

-0.03 

0.07 

0.08 

0.09 

0.28 

0.03 

-0.08 

0.03 

0.04 

0.02 

Bail.  ext. 

-0.16 

-0.02 

-0.17 

-0.07 

-0.19 

-0.12 

-0.03 

-0.05 

-0.16 

-0.46 

-0.36 

-0.11 

-0.14 

The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

20 


NORTH  AMERICA.  —  TORONTO. 


VIII. 
Lot.  43°  40'  N. 


Long.  79°  21'  W.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  LEFROY. 

Degrees  of  Fahrenheit. 


Hour.        |    Jan. 

Feb.    March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec 

Year. 

1 

Midnight.          1.47 

1.73 

2.63 

3.22 

5.02 

5.15 

6.37 

5.33 

5.96 

3.22 

1.80 

0.90 

3.57 

1             1.95 

2.09 

3.11 

3.79 

5.93 

6.00 

7.13 

6.06 

4.57 

3.80 

2.10 

1.50 

!    4.00 

2        ;     2.05 

2.46 

3.47 

4.48 

6.77 

6.70 

7.68 

6.69 

5.17 

4.13 

2.36 

1.85 

4.48 

3 

2.20 

2.82 

3.76 

5.08 

7.45 

7.50 

8.41 

7.29 

5.59 

4.31 

2.66 

1.96 

4.92 

4 

2.28 

3.20 

4.07 

5.38 

7.93 

8.06 

9.03 

7.63 

6.18 

4.64 

2.85 

2.04 

5.27 

5 

2.46 

3.62 

4.35 

5.75 

7.83 

7.88 

9.02 

7.89 

6.77 

4.77 

2.76 

2.07 

5.43 

6 

1.83 

4.23 

4.75 

5.48 

5.40 

5.21 

5.92 

6.57 

6.17 

4.71 

2.52 

2.39 

4.60 

7 

1.94 

4.34 

3.93 

3.22 

2.43 

2.41 

2.38 

3.28 

3.68 

3.94 

2.52 

2.55 

3.05 

8 

1.66 

3.29 

1.89 

1.09 

0.06 

0.10 

-0.31 

0.21 

1.02 

1.66 

1.53 

2.12 

1.25 

9 

0.63 

1.02 

-0.25 

-1.01 

-2.11 

-1.82 

-2.39 

-2.26 

-1.52 

-1.01 

0.01 

0.92 

-0.82 

10 

-0.59 

-0.95-1.91 

-2.45 

-3.81  -3.49 

-3.98 

-4.18 

-3.47 

-2.93 

-1.41 

-0.53 

-2.47 

11 

-1.70-2.44 

-3.14 

-3.85 

-4.92  -4.77 

-5.49 

-5.57 

-4.85 

-4.33 

-2.44 

-1.72 

-3.77 

Noon. 

-2.48  -3.56 

-4.15 

-4.86 

-5.87  -5.88 

-6.72 

-6.39 

-5.95 

-5.36 

-3.34 

-2.52 

-4.76 

1 

-2.92  -4.49  -4.79 

-5.72 

-6.83  -6.59 

-7.58 

-7.11 

-6.58 

-5.76 

-3.74 

-3.06 

-5.43 

2 

-3.20 

-4.88 

-5.31 

-6.14 

-7.13  -7.03 

-8.26 

-7.62 

-6.96 

-6.04 

-3.82 

-3.31 

-5.81 

3 

-3.16 

-4.90 

-5.15 

-6.16 

-7.20  -7.37 

-8.34 

-7.98 

-7.01 

-5.85 

-3.64 

-3.13 

-5.82 

4 

-2.63 

-4.47 

-4.65 

-5.81 

-7.17  -7.60 

-8.25 

-7.79 

-6.75 

-5.17 

-2.83 

-2.47 

-5.47 

p* 

-1.68 

-3.30 

-3.92 

-5.12 

-6.80-7.18 

-7.93 

-7.20 

-5.78 

-3.40 

-1.58 

-1.49 

-4.61 

6 

-0.90 

-1.87 

-2.35 

-3.42 

-5.03  -5.73  -6.57 

-5.39 

-3.16 

-1.37 

-0.76 

-0.82 

-3.12 

7 

-0.40 

-0.98 

-0.91 

-0.94 

-2.19 

-2.99 

-3.28 

-1.64 

-0.43 

-0.25 

-0.15 

-0.47 

-1.22 

8 

-0.12 

-0.13 

0.03 

0.66 

0.43 

0.33 

0.68 

1.23 

0.81 

0.48 

0.19 

-0.12 

0.38 

9 

0.07 

0.52 

1.00 

1.78 

2.31 

2.44 

2.99 

2.70 

1.90 

1.25 

0.44 

0.18 

1.46 

10             0.44 

1.06 

1.63 

2.59 

3.29    3.80 

4.24 

3.73 

2.94 

1.97 

0.78 

0.47 

2.24 

11 

0.77 

• 

1.60 

2.01 

3.07 

4.20 

4.76 

5.21 

4.54 

3.61 

2.68 

1.13 

0.59 

2.85 

6,  6 

0.46 

1.18 

1.20 

1.03 

0.17 

-0.26 

-0-32 

0.59 

* 

1.50 

1.67 

1.38 

0.78 

0.74 

7,7 

0.77 

1.67 

1.51 

1.14 

0.12 

-0.29 

-0.45 

0.82 

1.62 

1.84 

1.18 

1.04 

0.91 

8,  8 

0.77 

1.58 

0.96 

0.87 

0.24 

0.21 

0.18 

0.72 

0.91 

1.45 

0.98 

1.15 

0.82 

9,9 

0.35 

0.77 

0.37 

0.38 

0.10 

0.31 

0.30 

0.22 

0.19 

0.10 

0.22 

0.55 

0.32 

10,10 

-0.07 

0.05 

-0.14 

-0.07 

-0.26 

0.25 

0.13 

-0.22 

-0.26 

-0.48 

-0.31 

-0.03 

-0.11 

6,  2,  10 

-0.31 

0.14 

0.36 

0.64 

0.52 

0.66 

0.63 

0.89 

0.72 

0.21  -0.17 

-0.15 

0.34 

7,2,9      -0.40-0.01 

-0.09 

-0.38  -0.80  -0.73 

-0.96 

-0.55  -0.46  -0.28  -0.29  -0.19 

-0.43 

9,12,3,9-1.23-1.73 

1 

-2.01 

-2.56j-3.22 

-3.16 

-3.61 

-3.48  -3.14 

-2.74 

-1.63 

-1.14 

-2.48 

j 
Mean,     j  25.82 

23.70 

29.79 

41.99 

52.92  60.67 

66.39 

65.86  57.55  44.14 

36.18 

27.40 

44.37 

I 

I 

I 

The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted, 

E  21 


NORTH  AMERICA.  —  TORONTO. 


IX. 

Lat.  43°  40'  N. 


Long.  79°  21'  W.  Gr. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour. 

Jan. 

Feb. 

March. 

April. 

May.      June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

-Dec.        Year. 

Midn. 

0.6S 

0.81 

.10 

1.45 

2.24 

2.36 

2.91 

2.43 

1.76 

1.44 

0.81 

0.40 

1.53 

1 

0.88 

0.98 

.31 

0.78 

2.62 

2.67 

3.29 

2.72 

2.03 

1.71 

0.94 

0.66 

1.80 

2 

0.92 

1.13 

.48 

2.08 

2.99 

2.98 

3.54 

3.02 

2.29 

1.85 

.06 

0.83 

2.01 

3 

0.99 

1.32 

.61 

2.17 

3.31 

3.32 

3.86 

3.32 

2.49 

1.92 

.20 

0.88 

2.20 

4 

1.03 

1.45 

.78 

2.36 

3.52 

3.58 

4.14 

3.48 

2.76 

2.06 

.28 

0.90 

2.36 

5 

1.11 

1.61 

2.01 

2.52 

3.49 

3.49 

4.16 

3.57 

3.04 

2.13 

.23 

0.91 

2.44 

6 

0.79 

1.86 

2.13 

2.47 

2.40 

2.32 

2.74 

2.92 

2.74 

2.04 

.11 

1.09 

2.05 

7 

0.83 

1.92 

1.75 

1.45 

1.08 

1.07 

1.11 

1.60 

1.60 

1.70 

.11 

1.16 

1.36 

8 

0.73 

1.47 

0.87 

0.45 

0.09 

0.03 

-0.05 

0.15 

0.38 

0.70 

0.64 

0.97 

0.56 

9 

0.30 

0.44 

-0.10 

-0.43 

-0.94 

-0.81 

-1.03 

-0-96 

-0.69 

-0.49 

-0.04 

0.45 

-0.36 

10 

-0.25 

-0.45 

-0.87 

-1.11 

-1.69 

-1.55 

-1.78 

-1.84 

-1.57 

-1.35 

-0.68 

-0.20 

-1.11 

11 

-0.77 

-1.16 

-1.41 

-1.72 

-2.20 

-2.12 

-2.47 

-2.48 

-2.20 

-1.96 

-1.13 

-0.75 

-1.70 

Noon. 

-  .12 

-1.69 

-1.87 

-2.18 

-2.62 

-2.61 

-3.05 

-3.04 

-2.64 

-2.36 

-1.48 

-1.11 

-2.15 

1 

-  .34 

-2.07 

-2.16 

-2.60 

-3.03 

-2.93 

-3.46 

-3.25 

-2.90 

-2.55 

-1.66 

-1.42    -2.45 

2 

-  .46 

-2.25 

-2.41 

-2.76 

-3.18 

-3.12 

-3.84 

-3.51 

-3.08 

-2.70 

-1.69 

-1.49-2.62 

3 

-  .44 

-2.24 

-2.32 

-2.80 

-3.21 

-3.29 

-3.92 

-3.66 

-3.09 

-2.60 

-1.62 

-1.38    -2.63 

4 

-  .21 

-2.00 

-2.11 

-2.62 

-3.19  -3.40 

-3.93 

-3.60 

-3.00 

-2.28 

-1.22 

-1.09    -2.47 

5 

-0.77 

-1.47 

-1.78 

-2.30 

-3.02 

-3.13 

-3.72 

-3.35 

-2.57 

-1.50 

-0.68 

-0.67   -2.08 

6 

-0.40 

-0.82 

-1.03 

-1.50 

-2.24 

-2.55 

-3.08 

-2.51 

-1.38 

-0.59 

-0.32 

-0.:56   -1.40 

7 

-0.17 

-0.38 

-0.38 

-0.37 

-0.96 

-1.33 

-1.54 

-0.74 

-0.18 

-0.10 

-0.06 

-0.21    -0.53 

8 

-0.03 

0.00 

0.05 

0.33 

0.24 

0.13 

0.33 

0.56 

0.39 

0.23 

0.08 

-0.01      0.19 

9 

0.06 

0.28 

0.50 

0.81 

1.02 

1.09 

1.38 

1.26 

0.85 

0.57 

0.20 

0.07      0.67 

10 

0.23 

0.53 

0.79 

1.16 

1.45 

1.69 

1.93 

1.72 

1.32 

0.90 

0.36 

0.20      1.02 

11 

0.37 

0.76 

1.08 

1.38 

1.86 

2.12 

2.45 

2.07 

1.60 

1.20 

0.52 

0.25      1.31 

Mean,  j-2.97 

-3.88 

-0.9S 

4.72 

9.29 

12.75 

15.11    15.00 

11.371  5.42 

1.88  !-2.03 

X. 

NORTH  AMERICA.  —  MONTREAL.    Lat.  45°  30'  N.    Long.  73°  22'  E.  Gr. 

Degrees  of  Fahrenheit. 

Hour. 

Aug.      Sept. 

Oct. 

Nov. 

Dec.    |    Jan. 

Feb. 

March. 

April. 

May. 

June.      July,    j  -Y< 

Midn. 

4.00 

3.89 

2.83 

1.36 

1.68 

1.10 

1.28 

1.31 

2.52 

4.55 

5.25 

4.39 

2.S5 

2 

5.39 

4.34 

4.01 

l'.59 

1.00 

2.36 

2.69 

2.88 

4.37 

6.95 

7.42 

7.17 

4.20 

4 

6.34 

5.60 

4.84 

1.81 

1.38 

2.88 

3.36 

5.56 

7.09 

6.95 

7.18 

7.57 

4.96 

6 

5.99 

4.59 

4.83 

1.36 

1.32 

3.54 

3.90 

5.22 

5.56 

6.61 

5.55 

5.46 

4.50 

8 

2.79 

2.19 

2.52 

0.78 

0.92 

3.10 

3.22 

3.30 

3.44 

3.06 

0.88 

0.60 

2.24 

10 

-1.74 

-1.48 

-0.99 

-0.41 

0.21 

-0.21 

-0.81 

-0.03 

-0.79 

-0.97 

-1.75 

-2.85 

-0.93 

Noon. 

-5.63 

-5.43 

-4.22 

-1.S7 

-1.22 

-2.82 

-3.50 

-4.23 

-5.01 

-7.10 

-5.17 

-5.46 

-4.30 

2 

-7.93 

-6.60 

-6.96 

-2.37 

-2.54 

-4.07 

-5.43 

-649 

-5.99  -8.76 

-7.72 

-7.36 

-6.02 

4 

-7.72  -6.70 

-5.62 

-2.52 

-3.22 

-3.88 

-3.60 

-5.96 

-5.79  -8.35 

-7.00 

-7.51 

-5.65 

6 

-5.63  -2.80 

-2.79 

-1.04 

-1.30 

-1.77 

-1.50 

-3.43 

-3.88;  -3.87 

-5.02 

-5.40 

-3.20 

8 

-0.70 

0.10 

-0.25 

0.03 

0.02 

-0.90 

-0.59  -1.23 

-0.81-1.61 

-1.10 

-0.67 

-0.65 

10 

1.99 

2.39 

1.42 

1.18 

0.89 

0.17 

0.22  -0-30 

0.64  !  -1.87 

2.47 

2.64 

1.30 

Mean. 

66.40  57.70 

48.31 

30.39 

23.42 

8.10 

20.84  27.31 

42.27   56.61    64.38 

70.39 

43.01 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

22 


X. 

NORTH  AMERICA.  —  MONTREAL,  Continued. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year. 

Degrees  of  Fahrenheit. 


Hour. 

!    Aug.   i    Sept.        Oct.       Nov.       Dec.       Jan.       Feb.      March. 

April. 

May. 

June. 

July.  ' 

Year. 

A.M.I 

5.03      4.92 

2.53      1.16 

0.88  ,    1.43 

1.61 

4.38 

3.12 

4.85 

4.55 

5.07 

3.30 

3 

5.99  1    5.20 

3.61 

1.58 

1.79 

1.30 

2.72 

5.18 

5.14 

6.51 

5.10 

6.80 

4.25 

5 

6.44      5.43 

4.45 

2.08 

2.21 

1.87 

3.95 

6.84 

6.54 

6.56 

6.30 

7.76 

5.05 

7      2.10     3.47 

3.61     2.01 

2.08 

1.98 

5.22 

7.07 

3.84 

3.56 

4.72 

3.04 

3.56 

9    -0.58 

0.73 

0.77     0.63 

1.14 

1.16 

3.99 

2.96 

0.71 

0.50 

-0.02 

0.22 

1.02 

11 

1-3.61 

-2.20 

-2.73  -1.35 

-0.49 

-1.08 

-0.17 

-2.51 

-2.48 

-2.79 

-3.42 

-3.21 

-2.17 

P.M.l 

-6.61 

-5.12 

-5.41-3.47 

-2.38 

-1.49 

-4.80 

-7.41 

-4.93 

-5.78 

-5.97 

-6.08 

-4.95 

3 

-7.34 

-6.65 

-5.80  -3.22 

-2.7S 

-2.36 

-6.08 

-9.03 

-6.33 

-6.46 

-6.93 

-8.01 

-5.91 

5 

-5.47 

-5.83 

-3.15  -1.19  -1.44  -0.63 

-4.12 

-6.48 

-5.63 

-6.62 

-6.18 

-6.53 

-4.43 

7 

-1.45 

-0.62 

-1.00  -0.44  -0.70  -0.60 

-1.23 

-2.40 

-2.93 

-3.50 

-3.17  -2.88 

-1.74 

9 

1.58 

1.32 

0.32     0.13  -0.71  -0.66 

-0.96 

-0.75 

0.44 

0.61 

1.58      1.17 

0.34 

11 

3.10 

3.02 

2.47 

1.48     0.22     0.61 

0.24 

1.78     2.06 

2.52 

3.55      3.39 

2.02 

Mean. 

i  69.69   57.53 

44.70  32.76   15.91  \  18.96 

14.52 

22.50   34.47 

51.33    65.08    67.42  1  41.  24 

XI. 

NORTH  AMERICA.  —  SITKA.     Lat.  57°  3'  N.    Long.  135°  18'  W.  Gr.—  DOVE. 

Degrees  of  Reaumur. 

Hour.        Jan.        Feb.      March.    April.      May. 

June. 

July.       Aug.       Sept. 

Oct.       Nov. 

Dec. 

Year. 

Midn.        0.33 

0.58     0.97 

1.51 

l.SO 

1.81 

1.68 

1.34 

.07 

1.19 

0.41 

0.28 

1.08 

1 

0.34 

0.66  j    1.09 

1.68 

2.04 

2.06 

1.88 

1.53 

.18 

1.11 

0.46 

0.33 

1.20 

2 

0.35 

0.72 

1.17 

1.81 

2.20 

2.25 

2.04 

1.66 

.33 

1.18 

0.49 

0.33 

1.29 

3 

0.51 

0.78 

1.36 

1.89 

2.43 

2.49 

2.16 

1.77 

.24 

0.64 

0.48 

0.18 

1.33 

4 

0.45 

0.86 

1.47 

2.02 

2.55 

2.57 

2.20 

1.82 

.29 

0.68 

0.49 

0.18 

1.38 

5 

0.45 

0.83 

1.57 

2.07 

2.39 

2.47 

2.95 

1.89 

.33 

0.70 

0.49 

0.14 

1.52 

6 

0.45 

0.84!    1.56 

1.89 

1.76 

1.77 

1.67 

1.62 

1.33 

0.78 

0.46 

o.is' 

1.26 

7 

0.52 

0.82      1.37 

1.13 

0.96 

1.08     0.96 

1.09 

1.05 

0.58 

0.40 

0.17 

0.85 

s 

0.48 

0.76     0.75 

0.31 

0.00 

0.26 

0.26 

0.40 

0.47 

0.53 

0.33 

0.12 

0.39 

9 

0.39 

0.49  -O.OS 

-0.63 

-0.82 

-0.52!-0.5S  -0.26  -0.17 

0.12 

0.23 

0.10  -0.15 

10 

0.16 

-0.03  1  -0.69  -1.12 

-1.35  -1.28  -1.27 

-0.95  -0.73 

-0.28 

0.00 

-0.11  -0.64 

11 

-0.19 

-0.60 

-1.29 

-1.68 

-1.75 

-1.70 

-1.97 

-1.57 

-1.28 

-0.75 

-0.35 

-0.11  -1.11 

Noon.     -0.57 

-  .05 

-1.71 

-2.13 

-2.17 

-2.11 

-2.11 

-2.04 

-  .65 

-  .14 

-0.72 

-0.32  -1.48 

1        -0.83 

-  .36-1.74 

-2.33 

-2.35  -2.35:  -2.25 

-2.33 

-  .56 

-  .38 

-0.84 

-0.46  -1.65 

2       -0.95 

-  .44-1.99 

-2.28 

-2.40 

-2.42-2.31 

-2.16  -  .86 

-  .42 

-1.00 

-0.50  -1.73 

3       -0.95 

-  .47 

-1.94 

-2.10 

-2.28 

-2.31  1-2.13 

-2.00;-  .72 

-  .37 

-0.94 

-0.44  -1.64 

4 

-0.78  -  .20 

-1.67  -1.91 

-2.04 

-2.09-1.94-1.76  -  .56 

-  .13 

-0.75 

-0.32  -1.43 

5 

-0.50 

-0.85 

-1.17 

-1.63 

-1.73 

-1.76 

-1.65 

-1.43 

-  .24 

-0.88 

-0.45 

-0.20  -1.12 

6 

-0.25 

-0.45 

-0.82 

-1.13 

-1.37 

-1.48 

-1.26 

-1.02 

-0.64 

-0.50 

-0.21 

-0.10  -0.77 

7 

-0.15 

-0.10 

-0.29, 

-0.48 

-0.76 

-1.00-0.81   -0.49-0.28 

-0.16 

-0.04 

-0.03-0.38 

8 

-0.01 

0.11 

0.13 

0.15 

-0.23 

-0.41  -0.22      0.12      0.19 

0.06 

0.07 

0.01     0.00 

9 

0.15 

0.30 

0.44 

0.70 

0.48 

0.27     0.33     0.66     0.52 

0.21 

0.22 

0.12 

0.37 

10 

0.23 

0.37 

0.64 

1.07 

1.02 

0.97 

0.99 

0.96     0.76 

0.30 

0.29 

0.19 

0.65 

11 

!    0.31 

0.48 

0.84 

1.28 

1.57 

1.46 

1.38 

1.19     0.90  j    0.95 

0.43 

0.22     0.93 

Mean. 

-1.39 

-1.07  j  0.55 

3.51     6.21 

9.10 

10.24    10.28    7.96     5.26      2.52 

1.73 

E 


The  numbers  -without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

23 


ARCTIC  AMERICA.  —  BOOTHIA  FELIX. 


XII. 

Lai.  69C 


59'  N.     Long.  92°  1'  W.  Greenw. 
Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.08 

0.42 

1.61 

2.17 

2.64 

2.38 

1.78 

1.34 

0.56 

0.30 

0.02 

0.12 

1.12 

2 

0.10 

0.28 

1.85 

2.25 

2.75 

2.55 

1.78 

1.30 

0.62 

0.32 

0.18 

0.13 

1.15 

3 

0.11 

0.25 

2.10 

2.30 

2.61 

2.45 

1.65 

1.17 

0.66 

0.33 

0.29 

0.10 

1.12 

4 

0.11 

0.21 

2.30 

2.26 

2.23 

2.05 

1.35 

1.02 

0.66 

0.34 

0.31 

0.06 

1.02 

5 

0.10 

0.22 

2.38 

2.02 

1.76 

1.39 

0.99 

0*86 

0.56 

0.32 

0.24 

0.02 

0.87 

6 

0.10 

0.26 

2.23 

1.53 

1.02 

0.65 

0.61 

0.70 

0.46 

0.27 

0.13 

-0.04 

0.64 

7 

0.09 

0.29 

1.77 

0.81 

0.35 

-0.04 

0.26 

0.50 

0.27 

0.17 

0.02 

-0.07 

0.37 

8 

0.08 

0.22 

0.98 

-0.06 

-0.32 

-0.58 

-0.03 

0.24 

0.05 

0.01 

0.01 

-0.10 

0.04 

9 

0.06 

0.05 

-0.06 

-0.98 

-0.95 

-0.99 

-0.37 

-0.10 

-0.12 

-0.20 

-0.04 

-0.10 

-0.32 

10 

0.02 

-0.26 

-1.22 

-1.81 

-1.54 

-1.33 

-0.70 

-0.49 

-0.43 

-0.41 

-0.14 

-0.10 

-0.70 

11 

-0.02 

-0.58 

-2.28 

-2.45 

-2.06 

-1.66 

-  .05 

-0.86 

-0.65 

-0.59 

-0.26 

-0.11 

-1.05 

Noon.  .  . 

-0.05 

-0.87 

-3.05 

-2.86 

-2.46 

-2.02 

-  .43 

-1.16 

-0.82 

-0.69 

-0.32 

-0.12 

-1.32 

1 

-0.11 

-1.02 

-3.38 

-3.03 

-2.66 

-2.33 

-  .70 

-1.34 

-0.93 

-0.68 

-0.30 

-0.14 

-1.47 

2 

-0.14 

-0.98 

-3.26 

-2.96 

-2.65 

-2.48 

-  .86 

-1.38 

-0.94 

-0.57 

-0.19 

-0.13 

-1.46 

3 

-0.15 

-0.78 

-2.78 

-2.67 

-2.40 

-2.38 

-  .78 

-1.32 

-0.93 

-0.38 

-0.04 

-0.10 

-1.31 

4 

-0.14 

-0.46 

-2.06 

-2.18 

-1.98 

-1.98 

-  .56 

-1.18 

-0.68 

-0.18 

0.06 

-0.05 

-1.03 

5 

-0.11 

-0.14 

-1.29 

-1.50 

-1.45 

-1.36 

-1.18 

-1.01 

-0.44 

0.01 

0.24 

0.01 

-0.69 

6 

-0.09 

0.13 

-0.57 

-0.74 

-0.88 

-0.66 

-0.78 

-0.78 

-0.17 

0.14 

0.31 

0.07 

-0.34 

7 

-0.06 

0.32 

0.01 

0.06 

-0.34 

-0.01 

-0.34 

-0.50 

0.08 

0.22 

0.36 

0.10 

-0.01 

8 

-0.05 

0.43 

0.44 

0.78 

0.20 

0.51 

0.07 

-0.16 

0.26 

0.25 

0.38 

0.11 

0.27 

9 

-0.03 

0.50 

0.76 

1.35 

0.74 

0.92 

0.50 

0.24 

0.38 

0.26 

0.38 

0.10 

0.51 

10 

-0.02 

0.51 

0.99 

1.74 

1.28 

1.26 

0.90 

0.66 

0.44 

0.26 

0.35 

0.10 

0.71 

11 

0.02 

0.52 

1.19 

1.95 

1.82 

1.63 

1.20 

1.01 

0.48 

0.26 

0.28 

0.09 

0.87 

Midn.  .  . 

0.05 

0.49 

1.38 

2.08 

2.30 

2.04 

1.59 

1.25 

0.51 

0.23 

0.15 

0.12 

1.02 

6.  6 

0.01 

0.20 

"  0.83 

0.40 

0.07 

-0.01 

-0.09 

-0.04 

0.15 

0.21 

0.09 

0.02 

0.15 

7.  7 

0.02 

0.31 

0.89 

0.44 

0.01 

-0.03 

-0.04 

-0.00 

0.18 

0.20 

0.17 

0.02 

0.18 

8.  8 

0.02 

0.33 

0.71 

0.36 

-0.06 

-0.04 

0.02 

0.04 

0.16 

0.13 

0.20 

0.01 

0.16 

9.  9 

0.02 

0.28 

0.35 

0.19 

-0.11 

-0.04 

0.07 

0.07 

0.13 

0.03 

0.17 

-0.00 

0.10 

10.10 

-0.00 

0.13 

-0.12 

-0.04 

-0.13 

-0.04 

0.10 

0.09 

0.01 

-0.08 

0.11 

-0.00 

0.00 

7.  2.  9 

-0.03 

-0.06 

-0.24 

-0.27 

-0.52 

-0.53 

-0.37 

-0.21 

-0.10 

-0.05 

0.06 

-0.03 

-0.20 

6.  2.  8 

-0.03 

-0.10 

-0.20 

-0.22 

-0.48 

-0.44 

-0.39 

-0.28 

-0.07 

-0.02 

0.02 

-0.02 

-0.19 

6.  2.10 

-0.02 

-0.07 

-0.01 

0.10 

-0.12 

-O.U 

-0.12 

-0.01 

-0.01 

-0.01 

0.01 

-0.02 

-0.04 

6.  2.  6 

-0.04 

-0.20 

-0.53 

-0.72 

-0.84 

-0.83 

-0.68 

-0.49 

-0.22 

-0.05 

-0.00 

-0.03 

-0.39 

7.  2 

-0.03 

-0.35 

-0.75 

-1.08 

-1.15 

-1.26 

-0.80 

-0.44 

-0.34 

-0.20 

-0.11 

-0.10 

-0.55 

8.  2 

-0.03 

-0.38 

-1.14 

-1.51 

-1.49 

-1.53 

-0.95 

-0.57 

-0.45 

-0.28 

-0.09 

-0.12 

-0.71 

8.  1 

-0.02 

-0.40 

-1.20 

-1.55 

-1.49 

-1.46 

-0.87 

-0.55 

-0.44 

-0.34 

-0.15 

-0.12 

-0.72 

7.  1 

-0.01 

-0.37 

-0.81 

-1.11 

-1.16 

-1.19 

-0.72 

-0.42 

-0.33 

-0.26 

-0.16 

-0.11 

-0.55 

9.12.3.9 

-0.04 

-0.28 

-1.28 

-1.29 

-1.27 

-1.12 

-0.77 

-0.59 

-0.37 

-0.25 

-0.01 

-0.06 

-0.61 

7.  2.2(9) 

-0.03 

0.08 

0.01 

0.14 

-0.21 

-0.17 

-0.15 

-0.10 

0.02 

0.03 

0.14 

-0.00 

-0.02 

Dail.ext. 

-0.02 

-0.25 

-0.50 

-0.37 

0.05 

0.04 

-0.04 

-0.02 

-0.14 

-0.18 

0.03 

-0.01 

-0.16 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

24 


XIII. 

N.  AMERICA.  —  LAKE  ATHABASCA.     Lett.  59°  N.     Long.  111°  W.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 

Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  LEFROY. 

The  corrections  for  April  and  May  are  derived  from  observations  made  at  Fort  Simpson,  Lat.  62o  N. 
Degrees  of  Fahrenheit. 


Hour.                  April.                 May. 

October. 

November. 

December. 

January. 

February. 

daily  ext.            1.58 

1.71 

0.33 

0.25 

-0.17 

0.77 

1.19 

6,  6 

1.15 

0.51 

1.07 

0.59 

0.27 

0.84 

1.19 

7,  7 

1.50 

0.16 

0.76 

0.54 

0.30 

0.58 

1.31 

8,  8 

1.72 

0.18 

0.69 

0.55 

0.62 

0.95 

1.27 

9,  9                0.54 

0.30 

0.37 

0.32 

0.84 

0.80 

0.78 

10,  10           -0.43 

-0.08 

-0.32 

-0.06 

0.34 

0.12 

0.31 

11,  11            -1.68 

-1.20 

-0.57 

-0.37 

0.10 

-0.62 

-0.23 

6,  2,  10             0.47 

0.46 

-0.31 

-0.21 

-0.22 

-0.17 

-0.05 

7,  3,  11             0.46 

0.59 

-0.40 

-0.16 

0  17 

0.06 

-0.26 

Mean.             32.48 

44.56             21.44 

9.76 

0.40 

-23.00 

4.79 

XIV. 

ARCTIC  AMERICA.  -MELVILLE  ISLAND.    Lat.  74°  47'  N.    Long.  110°  48'  W.  Gr.— 

DOVE. 

Degrees  of  Reaumur. 

Hour. 

January. 

February. 

March. 

October. 

Hour.           November,    i    December. 

A.M.    1 

0.12 

0.10 

1.04 

0.04 

A.M.   2 

-0.12 

-0.09 

3 

0.18 

0.05 

1.22 

0.12 

4 

-0.02 

-0.06 

5 

0.07 

0.25 

0.90 

0.24 

6 

0.00 

0.11 

7 

0.11 

0.29 

0.57 

0.20 

8 

-0.22 

0.07 

9 

-0.13 

-0.24 

0.29 

-0.15 

10 

-0.38 

0.11 

11 

-0.35 

-0.43 

-1.33 

-0.46 

12 

-0.41 

0.24 

P.M.    1 

-0.22 

-0.65 

-1.72 

-0.43 

P.M.  2 

-0.27 

0.14 

3 

-0.25 

-0.52 

-1.00 

0.22 

4 

0.16 

0.00 

5 

0.04 

0.04 

-0.43 

-0.24 

6 

0.27 

-0.12 

7 

0.04 

0.24 

0.06 

-0.10 

8 

0.38 

-0.26 

9 

0.11 

0.35 

0.33 

0.11     • 

10 

0.36 

-0.12 

11 

0.40 

0.49 

0.66 

0.43 

12 

0.25 

0.00 

Mean. 

-29.75 

-27.58 

-22.73          -14.32 

Mean. 

-18.65 

-25.75 

XV. 

SPITZBERGEN.  —  HECLA  COVE.     Lat.  79°  55'  N.     Long.  16°  49'  E.   Gr.- 

DOVE. 

Degrees  of  Reaumur. 

Hour. 

June. 

July. 

August. 

Hour. 

June. 

July. 

August. 

A.M.    1 

0.63 

0.62 

0.42 

P.M.   1 

-0.67 

-0.67 

-0.63 

3 

0.43 

0.84 

0.54 

3 

-0.58 

-0.42 

-0.58 

5 

0.26 

0.51 

0.53 

5 

-0.27 

-0.44 

-0.32 

7 

-0.12 

-0.02 

0.25 

7 

0.26 

-0.17 

-0.06 

9 

-0.29 

-0.09 

-0.09 

9 

0.21 

0.06 

0.14 

11 

-0.47 

-0.49 

-0.45 

11 

0.61              0.26 

0.24 

Mean. 

1.71              3.63 

2.84 

E 


The  numbers  \vithout  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

25 


XVI. 

S.  AMERICA.  —  Rio  JANEIRO.     Lat.  22°  54'  S.     Long.  43°  16'  W.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Fahrenheit. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.74 

1.51 

1.80 

0.90 

1.13 

0.56 

1.85 

1.31 

1.04 

0.97 

1.76 

1.31 

1.24 

2 

1.64 

2.41 

2.48 

1.64 

2.12 

1.53 

2.75 

2.00 

1.69 

1.64 

2.32 

2.05 

2.03 

3 

2.50 

3.11 

3.02 

2.32 

2.93 

2.43 

3.47 

2.66 

2.27 

2.21 

2.75 

2.66 

2.70 

4 

3.08 

3.90 

3.24 

2.79 

3.38 

3.04 

3.87 

3.04 

2.59 

2.50 

2.93 

2.99 

3.06 

5 

3.22 

3.29 

3.15 

2.90 

3.40 

3.29 

3.83 

3.08 

2.66 

2.52 

279 

2.99 

3.08 

6 

2.93 

2.84 

2.75 

2.75 

3.06 

3.20 

3.47 

2.79 

2.41 

2.27 

2.32 

2.68 

2.79 

7 

2.30 

2.21 

2.14 

2.30 

2.48 

2.84 

2.70 

2.25 

2.00 

1.82 

1.67 

2.12 

2.23 

8 

1.49 

1.49 

1.40 

1.71 

1.85 

2.39 

1.96 

1.60 

1.46 

1.28 

0.90 

1.40 

1.58 

9 

0.68 

0.72 

0.59 

1.04 

1.15 

1.82 

1.15 

0.90 

0.86 

0.68 

0.14 

0.59 

0.86 

10 

-0.07 

-0.05 

-0.23 

0.32 

0.50 

1.13 

0.32 

0.23 

0.18 

0.05 

-0.56 

-0.23 

-0.14 

11 

-0.77 

-0.86 

-1.01 

-0.45 

-0.23 

0.32 

-0.50 

-0.50 

-0.54 

-0.59 

-1.22 

-1.04 

-0.61 

Noon.  •  • 

-1.40 

-1.64 

-1.71 

-1.22 

-0.99 

-0.65 

-1.31 

-1.19 

-1.26 

-1.22 

-1.80 

-1.82 

-1.35 

1 

-2.00 

-2.30 

-2.30 

-1.94 

-1.71 

-1.67 

-2.16 

-1.91 

-1.89 

-1.78 

-2.32 

-2.43 

-2.03 

2 

-2.41 

-2.75 

-2.66 

-2.41 

-2.30 

-2.48 

-2.88 

-2.48 

-234 

-2.16 

-2.66 

-2.81 

-2.52 

3 

-2.59 

-2.88 

-2.84 

-2.66 

-2.66 

-2.99 

-3.40 

-2.84 

-2.50 

-2.27 

-2.79 

-2.86 

-2.77 

4 

-2.45 

-2.70 

-2.77 

-2.57 

-2.75 

-3.04 

-3.60 

-2.93 

-2.36 

-2.12 

-2.66 

-2.59 

-2.70 

5 

-2.05 

-2.30 

-2.50 

-2.21 

-2.54 

-2.75 

-3.47 

-2.68 

-2.00 

-1.78 

-2.25 

-2.09 

-2.39 

6 

-1.51 

-1.82 

-2.12 

-1.76 

-2.21 

-2.23 

-3.04 

-2.23 

-1.55 

-1.37 

-1.67 

-1.49 

-1.91 

7 

-1.04 

-1.40 

-1.67 

-1.28 

-1.89 

-1.76 

-2.39 

-1.67 

-1.13 

-1.04 

-1.08 

-0.99 

-1.44 

8 

-0.72 

-1.13 

-1.22 

-0.95 

-1.67 

-1.42 

-1.85 

-1.13 

-0.83 

-0.77 

-0.59 

-0.61 

-1.08 

9 

-0.59 

-0.92 

-0.77 

-0.72 

-1.44 

-1.26 

-1.22 

-0.70 

-0.61 

-0.61 

-0.14 

-0.38 

-0.79 

0 

-0.56 

-0.63 

-0.25 

-0.52 

-1.13 

-1.13 

-0.59 

-0.32 

-0.41 

-0.45 

0.23 

-0.16 

-0.50 

11 

-0.41 

-0.14 

0.36 

-0.25 

-0.63 

-0.86 

0.09 

0.09 

-0.09 

-0.16 

0.65 

0.14 

0.09 

Midn.  .  . 

0.00 

0.59 

1.06 

0.23 

0.14 

-0.29 

0.92 

0.61 

0.38 

0.32 

1.15 

0.65 

0.47 

6.  6 

0 

0.72 

0.52 

0.32 

0.50 

0.43 

0.50 

0.30 

0.29 

0.43 

0.45 

0.34 

0.61 

0.45 

7.  7 

0.63 

0.4] 

0.25 

0.52 

0.29 

0.54 

0.16 

0.29 

0.45 

0.41 

0.29 

0.56 

0.41 

8.  8 

038 

0.18 

0.09 

0.38 

0.09 

0.50 

0.07 

0.25 

0.32 

0.27 

0.16 

0.41 

0.25 

9.  9 

0.05 

-0.11 

-0.09 

-0.16 

-0.16 

0.29 

-0.05 

0.11 

0.14 

0.05 

0.00 

0.11 

0.05 

10.10 

-0.32 

-0.34 

-0.25 

-0.11 

-0.32 

0.00 

-0.14 

-0.05 

-0.11 

-0.20 

-0.18 

-0.20 

-0.18 

7.  2.  9 

-0.23 

-0.50 

-0.43 

-0.27 

-0.43 

-0.29 

-0.47 

-0.32 

-0.32 

-0.32 

-0.38 

-0.36 

-0.36 

6.  2.  8 

-007 

-0.34 

-0.38 

-0.20 

-0.29 

-0.23 

-0.43 

-0.27 

-0.25 

-0.23 

-0.32 

-0.25 

-0.27 

6.  2.10 

-0.02 

-0.18 

-0.05 

-0.07 

-0.11 

-0.14 

0.00 

0.00 

-0.11 

-0.11 

-0.05 

-0.09 

-0.07  , 

6.  2.  6 

-0.34 

-0.59 

-0.68 

-0.47 

-0.47 

-0.50 

-0.81 

-0.63 

-0.50 

-o.4a 

-0.68 

-0.54 

-0.56 

7.  2 

-0.07 

-0.27 

-0.27 

-0.07     0.09 

0.18 

-0.09 

-0.11 

-0.18 

-0.18 

-0.50 

-0.36 

-0.16 

8.  2 

-0.47 

-0.63 

-0.63 

-0.36  -0.23 

-0.05 

-0.47 

-0.45 

-0.45 

-0.45 

-0.88 

-0.72 

-0.47 

8.  1 

-0.27 

-0.41 

-0.45 

-0.11 

0.07 

0.36 

-0.11 

-0.16 

-0.23 

-0.25 

-0.72 

-0.52 

-0.23 

7.  1 

0.16 

-0.05 

-0.09 

0.18 

0.38 

0.59 

-0.27 

0.18 

0.07 

0.02 

-0.34 

-0.16 

-0.11 

9.12.3.9 

-0.97 

-1.19 

-1.19 

-0.90 

-0.99 

-0.77 

-1.19 

-0.97 

-088 

-0.86 

-1.15 

-1  13 

-1.01 

7.  2.2(9) 

-0.32 

-0.61 

-0.52 

-0.38 

-0.68 

-0.54 

-0.65 

-0.41 

-0.38 

-0.38 

-0.32 

-0.36 

-0.47 

Dail.  ext. 

0.32 

0.27 

0.20 

0.14 

0.34 

0.14 

0.14 

0.09 

0.09 

0.14 

0.07 

0.07 

0.16 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

26 


XVII. 

S.  AMERICA.  —  Rio  JANEIRO.     Lat.  22°  54'  S.     Long.  43°  16'  W.  G-reenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

> 
Mean. 

Morn.  1 

0.33 

0.67 

0.80 

0.40 

0.50 

0.25 

0.82 

0.58 

0.46 

0.43 

0.78 

0.58 

0.55 

2 

0.73 

1.07 

1.10 

0.73 

0.94 

0.68 

1.22 

0.89 

0.75 

0.73 

1.03 

0.91 

0.90 

3 

1.11 

1.38 

1.34 

1.03 

1.30 

1.08 

1.54 

1.18 

1.01 

0.98 

1.22 

1.18 

1.20 

4 

1.37 

1.51 

1.44 

1.24 

1.50 

1.35 

1.72 

1.35 

1.15 

1.11 

1.30 

1.33 

1.36 

5 

1.43 

1.46 

1.40 

1.29 

1.51 

1.46 

1.70 

1.37 

1.18 

1.12 

1.24 

1.33 

1.37 

6 

1.30 

1.26 

1.22 

1.22 

1.36 

1.42 

1.54 

1.24 

1.07 

1.01 

1.03 

1.19 

1.24 

7 

1.02 

0.98 

0.95 

1.02 

1.10 

1.26 

1.20 

1.00 

0.89 

0.81 

0.74 

0.94 

0.99 

8 

0.66 

0.66 

O.S2 

0.76 

0.82 

1.06 

0.87 

0.71 

0.65 

0.57 

0.40 

0.62 

0.70 

9 

0.30 

0.32 

0.26 

0.46 

0.51 

0.81 

0.51 

0.40 

0.38 

0.30 

0.06 

0.26 

0.38 

10 

-0.03 

-0.02 

-0.10 

0.14 

0.22 

0.50 

0.14 

0.10 

0.08 

0.02 

-0.25 

-0.10 

0.06 

11 

-0.34 

-0.38 

-0.45 

-0.20 

-0.10 

0.14 

-0.22 

-0.22 

-0.24 

-0.26 

-0.54 

-0.46 

-0.27 

Noon.  .  . 

-0.62 

-0.73 

-0.76 

-0.54 

-0.44 

-0.29 

-0.58 

-0,53 

-0.56 

-0.54 

-0.80 

-0.81 

-0.60 

1 

-0.89 

-1.02 

-1.02 

-0.86 

-0.76 

-0.74 

-0.96 

-0.85 

-0.84 

-0.79 

-1.03 

-1.08 

-0.90 

2 

-1.07 

-1.22 

-1.18 

-1.07 

-1.02 

-1.10 

-1.28 

-1.10 

-1.04 

-0.96 

-1.18 

-1.25 

-1.12 

3 

-1.15 

-1.28 

-1.26 

-1.18 

-1.18 

-1.33 

-1.51 

-1.26 

-1.11 

-1.01 

-1.24 

-1.27 

-1.23 

4 

-1.09 

-1.20 

-1.23 

-1.14 

-1.22 

-1.35 

-1.60 

-1.30 

-1.05 

-0.94 

-1.18 

-1.15 

-1.20 

5 

-0.91 

-1.02 

-1.11 

-0.98 

-1.13 

-1.22 

-1.54 

-1.19 

-0.89 

-0.79 

-1.00 

-0.93 

-1.06 

6 

-0.67 

-0.81 

-0.94 

-0.78 

-0.98 

-0.99 

-1.35 

-0.99 

-0.69 

-0.61 

-0.74 

-0.66 

-0.85 

7 

-0.46 

-0.62 

-0.74 

-0.57 

-0.84 

-0.78 

-1.06 

-0.74 

-0.50 

-0.46 

-0.48 

-0.44 

-0.64 

8 

-0.32 

-0.50 

-0.54 

-0.42 

-0.74 

-0.63 

-0.82 

-0.50 

-0.37 

-0.34 

-0.26 

-0.27 

-0.48 

9 

-0.26 

-0.41 

-0.34 

-0.32 

-0.64 

-0.56 

-0.54 

-0.31 

-0.27 

-0.27 

-0.06 

-0.17 

-0.35 

10 

-0.25 

-0.28 

-0.11 

-0.23 

-0.50 

-0.50 

-0.26 

-0.14 

-0.18 

-0.20 

0.10 

-0.07 

-0.22 

11 

-0.18 

-0.06 

0.16 

-0.11 

-0.28 

-0.38 

0.04 

-0.04 

-0.04 

-0.07 

0.29 

0.06 

-0.04 

Midn.  .  . 

0.00 

0.26 

0.47 

0.10 

0.06 

-0.13 

0.41 

0.27 

0.17 

0.14 

0.51 

0.29 

0.21 

6.  6 

0.32 

0.23 

0.14 

0.22 

0.19 

0.22 

0.10 

0.13 

0.19 

0.20 

0.15 

0.27 

0.20 

7.  7 

0.28 

0.18 

0.11 

0.23 

0.13 

0.24 

0.07 

0.13 

0.20 

0.18 

0.13 

0.25 

0.18 

8.  8 

0.17 

0.08 

0.04 

0.17 

0.04 

0.22 

0.03 

0.11 

0.14 

0.12 

0.07 

0.18 

0.11 

9.  9 

0.02 

-0.05 

-0.04 

0.07 

-0.07 

0.13 

-0.02 

0.05 

0.06 

0.02 

-0.00 

0.05 

0.02 

10.10 

-0.14 

-0.15 

-0.11 

-0.05 

-0.14 

-0.00 

-0.06 

-0.02 

-0.05 

-0.09 

-0.08 

-0.09 

-0.08 

7.  2.  9 

-0.10 

-0.22 

-0.19 

-0.12 

-0.19 

-0.13 

-0.21 

-0.14 

-0.14 

-0.14 

-0.17 

-0.16 

-0.16 

6.  2.  8 

-0.03 

-0.15 

-0.17 

-0.09 

-0.13 

-0.10 

-0.19 

-0.12 

-0.11 

-0.10 

-0.14 

-0.11 

-0.12 

6.  2.10 

-0.01 

-0.08 

-0.02 

-0.03 

-0.05 

-0.06 

-0.00 

-0.00 

-0.05 

-0.05 

-0.02 

-0.04 

-0.03 

6.  2.  6 

-0.15 

-0.26 

-0.30 

-0.21 

-0.21 

-0.22 

-0.36 

-0.28 

-0.22 

-0.19 

-0.30 

-0.24 

-0.25 

7.  2 

-0.03 

-0.12 

-0.12 

-0.03 

0.04 

0.08 

-0.04 

-0.05 

-0.08 

-0.08 

-0.22 

-0.16 

-0.07 

8.  2 

-0.21 

-0.28 

-0.28 

-0.16 

-0.10 

-0.02 

-0.21 

-0.20 

-0.20 

-0.20 

-0.39 

-0.32 

-0.21 

8.  1 

-0.12 

-0.18 

-0.20 

-0.05 

0.03 

0.16 

-0.05 

-0.07 

-0.10 

-0.11 

-0.32 

-0.23 

-0.10 

7.  1 

0.07 

-0.02 

-0.04 

0.08 

0.17 

0.26 

0.12 

0.08 

0.03 

0.01 

-0.15 

-0.07 

0.05 

9.12.3.9 

-0.43 

-0.53 

-0.53 

-0.40 

-0.44 

-0.34 

-0.53 

-0.43 

-0.39 

-0.38 

-0.51 

-0.50 

-0.45 

7.  2.2(9) 

-0.14 

-0.27 

-0.23 

-0.17 

-0.30 

-0.24 

-0.29 

-0.18 

-0.17 

-0.17 

-0.14 

-0.16 

-0.21 

Dail.ext. 

0.14 

0.12 

0.09 

0.06 

0.15 

0.06 

0.06 

0.04 

0.04 

0.06 

0.03 

0.03 

0.07 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

27 


HOURLY  'CORRECTIONS 


FOR 


PERIODIC    VARIATIONS. 


ASIA. 


XVIII. 

INDIA.  —  TREVANDRUM.     Lat.  8°  31'  N.     Long.  74°  50'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 

Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Fahrenheit. 


Hours. 

Jan. 

Feb. 

March 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

4.41 

4.03 

3.80 

3.85 

3.26 

2.66 

2.41 

2.88 

2.99 

3.06 

3.33 

4.25 

3.42 

2 

5.13 

4.95 

4.64 

4.46 

3.80 

3.02 

2.75 

3.24 

3.44 

3.44 

3.83 

4.86 

3.96 

3 

6.03 

6.12 

5.67 

5.15 

4.39 

3.47 

3.17 

3.74 

3.98 

3.92 

4.46 

5.67 

4.66 

4 

6.95 

7.31 

6.64 

5.74 

4.82 

3.80 

3.58 

4.21 

4.48 

4.34 

5.04 

6.50 

5.29 

5 

7.56 

8.15 

7.13 

5.81 

4.82 

3.83 

3.76 

4.41 

4.61 

4.46 

5.22 

6.93 

5.56 

6 

7.34 

8.01 

6.73 

5.11 

4.14 

3.35 

3.49 

4.07 

4.14 

4.01 

4.73 

6.57 

5.15 

7 

6.01 

6.59 

5.20 

3.53 

2.81 

2.34 

2.68 

3.06 

3.02 

2.88 

3.40 

5.11 

3.89 

8 

3.56 

3.92 

2.66 

1.22 

0.95 

0.90 

l.§5 

1.49 

1.26 

1.13 

1.40 

2.70 

1.87 

9 

0.41 

0.50 

-0.47 

-1.42 

-1.13 

-0.74 

-0.27 

-0.45 

-0.81 

-0.99 

-0.92 

-0.29 

-0.54 

10 

-2.84 

-2.97 

-3.53 

-3.89 

-3.04 

-2.30 

-1.91 

-2.41 

-2.86 

-3.06 

-3.11 

-3.24 

-2.93 

11 

-5.51 

-5.85 

-5.94 

-5.76 

-4.48 

-3.53 

-3.33 

-4.05 

-4.50 

-4.73 

-4.75 

-5.58 

-4.84 

Noon.  .  . 

-7.25 

-7.58 

-7.36 

-6.82 

-5.33 

-4.34 

-4.32 

-5.18 

-5.54 

-5.72 

-5.67 

-7.00 

-6.01 

1 

-7.92 

-8.17 

-7.72 

-7.04 

-5.60 

-4.68 

-4.79 

-5.69 

-5.87 

-5.94 

-5.90 

-7.49 

-6.41 

2 

-7.76 

-7.83 

-7.22 

-6.59 

-5.38 

-4.61 

-4.77 

-5.60 

-5.60 

-5.54 

-5.60 

-7.25 

-6.14 

3 

-7.09 

-6.98 

-6.26 

-5.65 

-4.79 

-4.19 

-4.30 

-5.04 

-4.86 

-4.66 

-4.95 

-6.57 

-5.45 

4 

-6.17 

-5.99 

-5.06 

-4.46 

-3.94 

-3.47 

-3.51 

-4.10 

-3.80 

-3.53 

-4.12 

-5.67 

-4.48 

5 

-5.13 

-4.88 

-3.83 

-3.11 

-2.88 

-2.52 

-2.52 

-2.90 

-2.59 

-2.32 

-3.15 

-4.61 

-8.38 

6 

-3.92 

-3.74 

-2.57 

-1.71 

-1.69 

-1.42 

-1.40 

-1.58 

-1.31 

-1.10 

-2.03 

-3.35 

-2.16 

7 

-2.50 

-2.45 

-1.31 

-0.34 

-0.50 

-0.32 

-0.29 

-0.27 

-0.11 

o.oo 

-0.81 

-1.89 

-0.90 

8 

-0.92 

-1.04 

-0.07 

0.92 

0.63 

0.70 

0.68 

0.90 

0.92 

0.97 

0.38 

-0.32 

0.32 

9 

0.68 

0.38 

1.06 

1.91 

1.53 

1.46 

1.40 

1.76 

1.69 

1.71 

1.42 

1.19 

1.35 

10 

2.05 

1.64 

1.96 

2.61 

2.16 

1.96 

1.85 

2.30 

2.18 

2.25 

2.21 

2.43 

2.14 

11 

3.08 

2.57 

2.63 

3.06 

2.57 

2.23 

2.09 

2.54 

2.48 

2.57 

2.68 

3.26 

2.66 

Midn.  .  . 

3.83 

3.31 

3.17 

3.42 

2.88 

2.41 

2.23 

2.68 

2.70 

2.81 

2.99 

3.80 

3.02 

6.  6 

1.71 

2.14 

2.09 

1.71 

1.24 

0.97 

1.04 

1.24 

1.42 

1.46 

1.35 

1.60 

1.51 

7.  7 

1.76 

2.07 

1.96 

1.60 

1.17 

1.01 

1.19 

1.40 

1.44 

1.44 

1.28 

1.62 

1.49 

8.  8 

1.33 

1.44 

1.31 

1.06 

0.79 

0.79 

1.01 

1.19 

1.08 

1.06 

0.88 

1.19 

1.10 

9.  9 

0.54 

0.43 

0.29 

0.25 

0.20 

0.36 

0.56 

0.65 

0.43 

0.36 

0.25 

0.45 

0.41 

10.10 

-0.41 

-0.65 

-0.79 

-0.63 

-0.45 

-0.18 

-0.02 

-0.07 

-0.34 

-0.41 

-0.45 

-0.40 

-0.41 

7.  2.  9 

-0.36 

-0.29 

-0.32 

-0.38 

-0.34 

-0.27 

-0.23 

-0.27 

-0.29 

-0.32 

-0.27 

-0.32 

-0.32 

6.  2.  8 

-0.45 

-0.29 

-0.18 

-0.18 

-0.20 

-0.18 

-0.20 

-0.20 

-0.18 

-0.18 

-0.16 

-0.34 

-0.23 

6.  2.10 

0.54 

0.61 

0.50 

0.38 

0.32 

0.23 

0.18 

0.25 

0.25 

0.25 

0.45 

0.59 

0.38 

6.  2.  6 

-1.44 

-1.19 

-1.01 

-1.06 

-0.97 

-J0.90 

-0.90 

-1.04 

-0.92 

-0.88 

-0.97 

-1.35 

-1.06 

7.  2 

-0.88 

-0.63 

-1.01 

-1.53 

-1.28 

-1.15 

-1.06 

-1.28 

-1.31 

-1.33 

-1.10 

-1.08 

-1.13 

8.  2 

-2.12 

-1.96 

-2.30 

-2.70 

-2.23 

-1.87 

-1.71 

-2.07 

-2.18 

-2.21 

-2.12 

-2.27 

-2.14 

8.  1 

-2.18 

-2.14 

-2.54 

-2.93 

-2.34 

-1.89 

-1.73 

-2.12 

-2.32 

-2.41 

-2.25 

-2.41 

-2.27 

7.  1 

-0.97 

-0.79 

-1.26 

-1.76 

-1.40 

-1.17 

-1.06 

-1.33 

-1.44 

-1.53 

-1.26 

-1.19 

-1.26 

9.12.3.9 

-3.31 

-3.42 

-3.26 

-2.99 

-2.43 

-1.96 

-1.87 

-2.23 

-2.39 

-2.41 

-2.54 

-3.17 

-2.66 

7.  2.2(9) 

-0.11 

-0.11 

0.02 

0.20 

0.14 

0.16 

0.18 

0.25 

0.20 

0.20 

0.16 

0.07 

0.11 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

31 


XIX. 

INDIA.  —  TREVANDHUM.     Lat.  8°  31'  N.     Long.  74°  50'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 

Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

1.96 

1.79 

1.69 

1.71 

1.45 

1.18 

1.07 

1.28 

1.33 

i:s6 

1.4S 

1.89 

1.52 

2 

2.28 

2.20 

2.06 

1.98 

1.69 

1.34 

1.22 

1.44 

1.53 

1.53 

1.70 

2.16 

1.76 

3 

2.68 

2.72 

2.52 

2.29 

1.95 

1.54 

1.41 

1.66 

1.77 

.74 

1.98 

2.52 

2.07 

4 

3.09 

3.25 

2.95 

2.55 

2.14 

1.69 

1.59 

1.87 

1.90 

.93 

2.2-J 

2.89 

2.35 

5 

3.36 

3.62 

3.17 

2.58 

2.14 

1.70 

1.67 

1.96 

2.05 

.98 

2.32 

3.08 

2.47 

6 

3.26 

3.56 

2.99 

2.27 

1.85 

1.49 

1.55 

1.81 

1.84 

.78 

2.10 

2.92 

2.29 

7 

2.67 

2.93 

2.31 

1.57 

1.25 

1.04 

1.19 

1.36 

1.34 

.28 

1.51 

2.27 

1.73 

8 

1.58 

1.74 

1.18 

0.54 

0.42 

0.40 

0.60 

0.66 

0.56 

0.50 

0.62 

1.20 

0.83 

9 

0.18 

0.22 

-0.21 

-0.63 

-0.50 

-0.33 

-0.12 

-0.20 

-0.36 

-0.44 

-0.41 

-0.13 

-0.24 

10 

-1.26 

-1.32 

-1.57 

-1.73 

-1.35 

-1.02 

-0.85 

-1.07 

-1.27 

-1.36 

-1.38 

-1.44 

-1.30 

11 

-2.45 

-2.60 

-2.64 

-2.56 

-1.99 

-1.57 

-1.48 

-1.80 

-2.00 

-2.10 

-2.11 

-2.48 

-2.15 

Noon.  .  . 

-3.22 

-3.37 

-3.27 

-3.03 

-2.37 

-1.93 

-1.92 

-2.30 

-2.46 

-2.54 

-2.52 

-3.11 

-2.67 

1 

-3.52 

-3.63 

-3.43 

-3.13 

-2.49 

-2.08 

-2.13 

-2.53 

-2.61 

-2.64 

-2.62 

-3.33 

-2.85 

2 

-3.45 

-3.48 

-3.21 

-2.93 

-2.39 

-2.05 

-2.12 

-2.49 

-2.49 

-2.46 

-2.49 

-3.22 

-2.73 

3 

-3.15 

-3.10 

-2.78 

-2.51 

-2.13 

-1.86 

-1.91 

-2.24 

-2.16 

-2.07 

-2.20 

-2.92 

-2.42 

4 

-2.74 

-2.66 

-2.25 

-1.98 

-1.75 

-1.54 

-156 

-1.82 

-1.69 

-1.57 

-1.83 

-2.52 

-1.99 

5 

-2.28 

-2.17 

-1.70 

-1.38 

-1.28 

-1.12 

-1.12 

-1.29 

-1.15 

-1.03 

-1.40 

-2.05 

-1.50 

6 

-1.74 

-1.66 

-1.14 

-0.76 

-0.75 

-0.63 

-0.62 

-0.70 

-0.58 

-0.49 

-0.90 

-1.49 

-0.96 

7 

-1.11 

-1.09 

-0.58 

-0.15 

-0.22 

-0.14 

-0.13 

-0.12 

-0.05 

0.00 

-0.36 

-0.84 

-0.40 

8 

-0.41 

-0.46 

-0.03 

0.41 

0.28 

0.31 

0.30 

0.40 

0.41 

0.43 

0.17 

-0.14 

0.14 

9 

0.30 

0.17 

0.47 

0.85 

0.68 

0.65 

0.62 

0.78 

0.75 

0.76 

0.63 

0.53 

0.60 

10 

0.91 

0.73 

0.87 

1.16 

0.96 

0.87 

0.82 

1.02 

0.97 

1.00 

0.98 

1.08 

0.95 

11 

1.37 

1.14 

1.17 

1.36 

1.14 

0.99 

0.93 

1.13 

1.10 

1.14 

1.19 

1.45 

1.18 

Midn.  .  . 

1.70 

1.47 

1.41 

1.52 

1.28 

1.07 

0.99 

1.19 

1.20 

1.25 

1.33 

1.69 

1.34 

6.  6 

0.76 

0.95 

0.93 

0.76 

0.55 

0.43 

0.46 

0.55 

0.63 

0.65 

0.60 

0.71 

0.67 

7.  7 

0.78 

092 

0.87 

0.71 

0.52 

0.45 

0.53 

0.62 

0.64 

0.64 

0.57 

0.72 

0.66 

8.  8 

0.59 

0.64 

0.58 

0.47 

0.35 

0.35 

0.45 

0.53 

0.48 

0.47 

0.39 

0.53 

0.49 

9.  9 

0.24 

0.19 

0.13 

0.11 

0.09 

0.16 

0.25 

0.29 

0.19 

0.16 

0.11 

0.20 

0.18 

10.10 

-0.18 

-0.29 

-0.35 

-0.28 

-0.20 

-0.08 

-0.01 

-0.03 

-0.15 

-0.18 

-0.20 

-0.18 

-0.18 

7.  2.  9 

-0.16 

-0.13 

-0.14 

-0.17 

-0.15 

-0.12 

-0.10 

-0.12 

-0.13 

-0.14 

-0.12 

-0.14 

-0.14 

6.  2.  8 

-0.20 

-0.13 

-0.08 

-0.08 

-0.09 

-0.08 

-0.09 

-0.09 

-0.08 

-0.08 

-0.07 

-0.15 

-0.10 

6.  2.10 

0.24 

0.27 

0.22 

0.17 

0.14 

0.10 

0.08 

0.11 

0.11 

0.11 

0.20 

0.26 

0.17 

6.  2.  6 

-0.64 

-0.53 

-0.45 

-0.47 

-0.43 

-0.40 

-0.40 

-0.46 

-0.41 

-0.39 

-0.43 

-0.60 

-0.47 

7.  2 

-0.39 

-0.28 

-0.45 

-0.68 

-0.57 

-0.51 

-0.47 

-0.57 

-0.58 

-0.59 

-0.49 

-0.48 

-0.50 

8.  2 

-0.94 

-0.87 

-1.02 

-1.20 

-0.99 

-0.83 

-0.76 

-0.92 

-0.97 

-0.98 

-0.94 

-1.01 

-0.95 

8.  1 

-0.97 

-0.95 

-1.13 

-1.30 

-1.04 

-0.84 

-0.77 

-0.94 

-1.03 

-1.07 

-1.00 

-1.07 

-1.01 

7.  1 

-0.43 

-0.35 

-0.56 

-0.78 

-0.62 

-0.52 

-0.47 

-0.59 

-0.64 

-0.68 

-0.56 

-0.53 

-0.56 

9.12.3.9 

-1.47 

-1.52 

-1.45 

-1.33 

-1.08 

-0.87 

-0.83 

-0.99 

-1.06 

-1.07 

-1.13 

-1.41 

-1.18 

7.  2.2(9) 

-0.05 

-0.05 

0.01 

0.09 

0.06 

0.07 

0.08 

0.11 

0.09 

0.09 

0.07 

0.03 

0.05 

DaiLext. 

-0.08 

-0.01 

-0.13 

-0.28 

-0.18 

-0.19 

-0.23 

-0.29 

-0.28 

-0.33 

-0.15 

-0.13 

-0.19 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

32 


XX. 


INDIA.  —  MADRAS.     Lat.  13°  4'  N.     Long.  80°  19' E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Fahrenheit. 


| 

Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June.     July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midnight. 

2.05 

2.54 

2.25     3.65 

2.74 

3.03     2.90 

2.86 

2.34 

1.84 

2.05 

1.89 

2.50 

1 

2.54 

3.26 

2.90 

3.08 

3.31 

3.50 

3.10 

3.01 

2.70 

2.27 

2.54 

2.25 

2.87 

2 

2.96 

3.95 

3.60 

3.57 

3.72 

3.86 

3.55 

3.39 

3.10 

2.79 

3.03 

2.63 

3.35 

3 

3.33 

4.52 

4.25 

4.07 

4.07 

4.27 

3.93 

3.69 

3.55 

3.12 

3.50 

2.96 

3.77 

4 

3.62 

5.06 

4.79 

4.40 

4.45 

4.68 

4.31 

3.98 

3.95 

3.46 

3.91 

3.19 

4.15 

5 

3.81 

5.49 

5.24 

4.45 

4.68 

4.95 

4.66 

4.34 

4.23 

3.71 

4.23 

3.60 

4.45 

6 

4.05 

5.64 

5.11 

3.78 

3.86 

4.21 

4.31 

4.07 

3.82 

3.28 

4.05 

3.73 

4.16 

7 

2.43 

3.33 

2.54 

1.78 

2.07 

2.51 

2.92 

2.79 

2.43 

1.80 

2.00 

2.38 

2.41 

8 

-0.04 

0.29 

0.16 

-0.18 

-0.11 

0.38 

1.06 

0.99 

0.72 

0.13 

-0.56 

0.00 

0.23 

9 

-2.02 

-1.93 

-1.89-2.41  -2.13 

-1.73 

-0.76 

-0.90 

-1.12 

-1.26 

-2.49 

-1.73 

-1.72 

10 

-3.26  -3.60 

-3.67-4.14  -4.68 

-3.67  -2.67 

-2.74 

-2.96 

-2.34 

-3.53 

-3.05 

-3.36 

11 

-4.02  -4.81 

-4.81 

-4.83 

-5.75 

-5.02 

-4.25 

-4.16 

-4.54 

-3.17 

-4.09 

-3.62 

-4.42 

Noon. 

-4.43 

-5.06 

-5.35 

-5.66 

-5.87 

-5.85 

-5.51 

-5.28 

-5.04 

-3.76 

-4.31 

-3.93 

-5.01 

1 

-4.40 

-5.35 

-5.42 

-5.53 

-5.64 

-6.05 

-6.07 

-5.75 

-5.04 

-3.73 

-4.25 

-3.86 

-5.09 

2 

-4.14 

-5.30 

-4.99  -4.95 

-4.99  -5.69 

-6.02 

-5.40 

-4.66 

-3.55 

-3.73 

-3.60 

-4.75 

3 

-3.46 

-4.85 

-4.27 

-4.07 

-4.00 

-4.61 

-4.92 

-4.59 

-3.73 

-3.03 

-3.05 

-2.88 

-3.95 

4 

-2.41 

-3.64 

-3.10 

-2.65 

-2.45 

-3.57 

-3.73 

-3.44 

-2.56 

-2.38 

-1.98 

-2.04 

-2.83 

5 

-1.19 

-2.27 

-1.66 

-1.03 

-1.01 

-1.91 

-2.18 

-1.84 

-1.44 

-1.26 

-0.88 

-1.01 

-1.47 

6 

-0.38 

-1.10 

-0.52 

0.20 

0.11 

-0.58 

-0.81 

-0.70 

-0.52 

-0.63 

-0.25 

-0.38 

-0.46 

7 

0.09 

-0.36 

0.17 

0.83 

0.76 

0.36 

0.16 

0.13 

0.07 

-0.18 

0.09 

0.00 

0.18 

8 

0.54 

0.27 

0.58 

0.99 

1.19 

0.97 

0.83 

0.74 

0.47 

0.16 

0.47 

0.34 

0.63 

9 

0.94 

0.81 

0.97 

1.57 

1.57 

1.42 

1.35     1.17 

0.99 

0.49 

0.74 

0.67 

1.06 

10 

1.39 

1.33 

1.39 

1.89 

1.96 

2.11 

1.87 

1.64 

1.39 

0.90 

1.08 

1.03 

1.50 

11             1-84 

1.87 

1.84 

2.25 

2.34 

2.41 

2.29 

2.14 

1.89 

1.28 

1.46 

1.44 

1.92 

6,  6 

1.83 

2.27 

2.29 

1.99 

1.98 

1.81 

1.75 

1.65 

1.65 

1.32 

1.90 

1.67 

1.84 

7,  7 

1.26 

1.48 

1.35 

1.30 

1.41 

1.43 

1.54 

1.46 

1.25 

0.81 

1.04 

1.19 

1.29 

8,  8 

0.25 

0.28 

0.37 

0.40 

0.54 

0.67 

0.94 

0.81 

0.59 

0.14 

-0.04 

0.17 

0.43 

9,  9 

-0.54 

-0.56 

-0.46 

-0.42 

-0.43 

-0.15 

0.29 

0.13 

-0.06 

-0.38 

-0.87 

-0.53 

-0.33 

10,  10 

|-0.93 

-1.13 

-1.14 

-1.12 

-1.36 

-0.78 

-0.40 

-0.55 

-0.78 

-0.70 

-1.22 

-1.01 

-0.93 

7,  1 

-0.98  -1.01  -1.44-1.87 

-1.78  -1.77  -1.57 

-1.48  -1.30 

-0.86 

-1.12  -0.74 

-1.33 

7,  2,9 

-0.26 

-0.39  -0.49 

-0.53 

-0.45 

-0.59  -0.58 

-0.48  -0.41  -0.42  -0.33  -0.18 

-0.43 

6,  2,  10        0.43 

0.56    0.50 

0.24 

0.28 

0.21     0.05 

0.10     0.18     0.21     0.47 

0.39 

0.30 

Mean.       76.77 

78.25 

82.24 

85.73 

87.10 

87.01 

86.22 

84.51 

83.50 

81.18  78.53  76.73 

1            .' 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

33 


XXI. 

INDIA.  —  MADRAS.     Lat.  13°  4'  N.     Long.  80°  19'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

1.41 

1.22 

1.32 

1.06 

1.26 

1.15 

0.93 

0.83 

1.26 

.18 

1.04 

1.38 

1.17 

2 

1.79 

1.64 

1.42 

1.36 

1.59 

1.42 

1.09 

1.40 

1.52 

.46 

1.32 

1.50 

1.46 

3 

2.14 

2.10 

1.50 

1.76 

1.94 

1.70 

1.26 

1.66 

1.67 

.70 

1.70 

1.68 

1.73 

4 

2.38 

2.42 

1.58 

2.10 

2.17 

1.90 

1.42 

1.66 

1.70 

.88 

1.90 

1.93 

1.92 

5 

2.42 

2.43 

1.61 

2.20 

2.18 

1.95 

1.42 

1.45 

1.62 

.88 

2.02 

2.17 

1.95 

6 

2.22 

2.05 

1.48 

1.91 

1.86 

1.77 

1.33 

1.10 

1.39 

.64 

1.81 

2.25 

1.73 

7 

1.76 

1.30 

1.14 

1.24 

1.19 

1.30 

1.12 

0.75 

1.02 

.14 

1.27 

2.00 

1.27 

8 

1.05 

.0.36 

0.54 

0.30 

0.27 

0.70 

0.78 

0.46 

0.47 

0.40 

0.50 

1.32 

0.60 

9 

0.15 

-0.59 

-0.23 

-0.71 

-0.75 

-0.06 

0.35 

0.16 

-0.23 

-0.46 

-0.35 

0.27 

-0.20 

10 

-0.82 

-1.38 

-1.04 

-1.56 

-1.67 

-0.82 

-0.21 

-0.18 

-1.02 

-1.26 

-1.10 

-0.94 

-1.00 

11 

-1.74 

-1.94 

-1.70 

-2.12 

-2.31 

-1.46 

-0.86 

-0.62 

-1.77 

-1.83 

-1.75 

-2.20 

-1.69 

Noon.  .  . 

-2.48 

-2.23 

-2.06 

-2.36 

-2.58 

-1.94 

-1.52 

-1.12 

-2.29 

-2.18 

-2.12 

-2.76 

-2.14 

1 

-2.90 

-2.34 

-2.10 

-2.34 

-2.48 

-2.20 

-2.13 

-1.57 

-2.47 

-2.17 

-2.25 

-2.98 

-2.33 

2 

-2.97 

-2.30 

-1.88 

-2.14 

-2.13 

-2.24 

-2.47 

-1.82 

-2.27 

-1.91 

-2.18 

-2.76 

-2.26 

3 

-2-68 

-2.12 

-1.52 

-1.84 

-1.62 

-2.07 

-2.48 

-1.77 

-1.77 

-1.50 

-1.98 

-2.25 

-1.97 

4 

-2.14 

-1.81 

-1.14 

-1.46 

-1.11 

-1.74 

-2.12 

-1.43 

-1.12 

-1.08 

-1.61 

-1.65 

-1.53 

5 

-1.47 

-1.34 

-0.83 

-1.00 

-0.65 

-1.28 

-1.44 

-0.94 

-0.50 

-0.70 

-1.10 

-1.13 

-1.03 

6 

-0.81 

-0.78 

-0.58 

-0.48 

-0.27 

-0.78 

-0.65 

-0.46 

-0.06 

-0.38 

-0.58 

-0.72 

-0.55 

7 

-0.26 

-0.18 

-0.35 

0.04 

0.02 

-0.30 

0.08 

-0.14 

0.18 

-0.14 

-0.14 

-0.39 

-0.13 

8 

0.13 

0.30 

-0.08 

0.49 

0.26 

0.12 

0.62 

-0.04 

0.27 

0.06 

0.36 

-0.06 

0.20 

9 

0.38 

0.62 

0.42 

0.71 

0.45 

0.42 

0.86 

-0.06 

0.33 

0.26 

0.64 

0.30 

0.44 

10 

0.58 

0.77 

0.60 

0.90 

0.61 

0.63 

0.91 

-0.06 

0.44 

0.46 

0.81 

0.66 

0.61 

11 

0.79 

0.84 

0.91 

0.91 

0.78 

0.79 

0.87 

0.11 

0.66 

0.67 

0.83 

0.99 

0.76 

Midn.  .  . 

1.06 

0.96 

1.16 

0.92 

0.98 

0.94 

0.84 

0.47 

0.95 

0.91 

0.89 

1.22 

0.94 

6.  6 

0.71 

0.64 

0.45 

0.72 

0.80 

0.50 

0.34 

0.32 

0.67 

0.63 

0.62 

0.77 

0.60 

7.  7 

0.75 

0.56 

0.40 

0.64 

0.61 

0.50 

0.60 

0.31 

0.60 

0.50 

0.57 

0.81 

0.57 

8.  8 

0.59 

0.33 

0.23 

0.40 

0.27 

0.41 

0.70 

0.21 

0.37 

0.23 

0.43 

0.63 

040 

9.  9 

0.27 

0.02 

0.10 

-0.00 

-0.15 

0.18 

0.61 

0.05 

0.05 

-0.10. 

0.15 

0.29 

0.12 

10.10 

-0.12 

-0.31 

-0.22 

-0.33 

-0-53 

-0.10 

-0.35 

-0.12 

-0.29 

-0.40 

-0.15 

-0.14 

-0.20 

7.  2.  9 

-0.28 

-0.13 

-0.11 

-0.06 

-0.16 

-0.17 

-0.16 

-0.38 

-0.31 

-0.17 

-0.09 

-0.15 

-0.18 

6.  2.  8 

-0.21 

0.02 

-0.16 

0.09 

-0.00 

-0.12 

-0.17 

-0.25 

-0.20 

-0.07 

-0.01 

-0.19 

-0.11 

6.  2.10 

-0.06 

0.17 

0.07 

0.22 

0.11 

0.05 

-0.08 

-0.26 

-0.15 

0.06 

0.15 

0.05 

0.03 

6.  2.  6 

-0.52 

-0.34 

-0.33 

-0.24 

-0.18 

-0.42 

-0.60 

-0.39 

-0.31 

-0.22 

-0.32 

-0.41 

-0.36 

7.  2 

-0.61 

-0.50 

-0.37 

-0.45 

-0.47 

-0.47 

-0.68 

-0.54 

-0.63 

-0.32 

-0.46 

-0.38 

-0.50 

8.  2 

-0.96 

-0.97 

-0.67 

-0.92 

-0.93 

-0.77 

-0.85 

-0.68 

-0.90 

-0.76 

-0.84 

-0.72 

-0.83 

8.  1 

-0.93 

-0.99 

-0.78 

-1.02 

-1.11 

-0.75 

-0.68 

-0.56 

-1.00 

-0.89 

-0.88 

-0.83 

^0.87 

7.   1 

-0.57 

-0.52 

-0.48 

-0.55 

-0.65 

-0.45 

-0.51 

-0.41 

-0.73 

-0.52 

-0.49 

-0.49 

-0.53 

9.12.3.9 

-1.16 

-1.08 

-0.85 

-1.05 

-1.13 

-0.01 

-0.70 

-0.70 

-0.99 

-0.97 

-0.95 

-1.11 

-0.97 

7.  2.2(9) 

-0.11 

0.06 

0.03 

0.13 

-0.01 

-0.03 

0.09 

-0.30 

-0.15 

-0.06 

0.09 

-0.04 

-0.03 

Dail.ext. 

-0.28 

0.05 

-0.25 

-0.08 

-0.20 

-0.15 

-0.53 

-0.08 

-0.39 

-0.15 

-0.12 

-0.37 

-0.19 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

84 


XXII. 

INDIA.  —  BOMBAY.     Lat.  18°  56'  N.     Long.  72°  54'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Fahrenheit. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

1.49 

1.40 

0.99 

1.13 

1.42 

1.15 

0.79 

0.97 

0.86 

1.49 

2.03 

1.55 

1.26 

2 

1.80 

1.69 

1.33 

1.51 

1.78 

.40 

0.88 

1.13 

0.97 

1.87 

2.18 

1.87 

1.53 

3 

2.27 

2.21 

1.91 

2.05 

2.14 

.69 

0.90 

1.24 

1.24 

2.32 

2.45 

2.41 

1.91 

4 

2.86 

2.84 

2.59 

2.48 

2.32 

.91 

0.90 

1.31 

1.53 

2.75 

2.81 

3.11 

2.27 

5 

3.47 

3.40 

3.04 

2.61 

2.23 

.96 

0.86 

1.31 

1.71 

2.95 

3.11 

3.78 

2.54 

4 

3.83 

3.62 

3.06 

2.34 

1.80 

.80 

0.79 

1.24 

1.67 

2.79 

3.15 

4.16 

2.52 

7 

3.69 

3.33 

2.54 

1.67 

1.15 

.42 

0.65 

1.04 

1.22 

2.21 

2.79 

4.01 

2.14 

8 

2.97 

2.48 

1.58 

0.77 

0.36 

0.88 

0.38 

0.74 

0.79 

1.28 

1.91 

3.24 

1.44 

9 

1.69 

1.22 

0.38 

-0.14 

-0.41 

0.23 

0.00 

0.32 

0.09 

0.16 

0.63 

1.87 

0.50 

10 

0.07 

-0.23 

-0.77 

-0.90 

-1.06 

-0.43 

-0.52 

-0.20 

-0.65 

-0.95 

-0.83 

0.16 

-0.52 

11 

-1.55 

-1.55 

-1.67 

-1.49 

-1.55 

-6.08 

-6.08 

-0.79 

-1.28 

-1.91 

-2.21 

-1.60 

-1.49 

Noon.  .  . 

-2.86 

-2.61 

-2.30 

-1.91 

-1.94 

-1.64 

-1.55 

-1.35 

-1.80 

-2.59 

-3.29 

-3.08 

-2.25 

1 

-3.69 

-3.29 

-2.66 

-2.25 

-2.21 

-2.12 

-1.82 

-1.78 

-2.12 

-2.99 

-3.92 

-4.10 

-2.75 

2 

-3.98 

-3.60 

-2.84 

-2.50 

-2.34 

-2.41 

-1.78 

-2.00 

-2.25 

-3.13 

-4.07 

-4.59 

-2.95 

3 

-3.85 

-3.65 

-2.86 

-2.61 

-2.32 

-2.45 

-1.44 

-1.98 

-2.16 

-2.99 

-3.85 

-4.55 

-2.90 

4 

-3.42 

-3.42 

-2.72 

-2.50 

-2.09 

-2.25 

-0.92 

-1.69 

-1.87 

-2.66 

-3.33 

-4.12 

-2.59 

5 

-2.84 

-2.95 

-2.34 

-2.07 

-1.64 

-1.78 

-0.38 

-1.24 

-1.37 

-2.14 

-2.61 

-3.38 

-2.07 

6 

-2.18 

-2.27 

-1.71 

-1.37 

-1.04 

-1.15 

0.09 

-0.72 

-0.74 

-1.46 

-1.78 

-2.45 

-1.40 

7 

-1.49 

-1.44 

-0.88 

-0.54 

-0.38 

-0.47 

0.38 

-0.23 

0.05 

-0.72 

-0.88 

-1.46 

-0.68 

8 

-0.79 

-0.56 

-0.07 

0.23 

0.18 

0.14 

0.50 

0.16 

0.47 

-0.02 

0.00 

-0.52 

-0.02 

9 

-0.11 

0.23 

0.56 

0.72 

0.59 

0.54 

0.54 

1.43 

0.86 

0.52 

0.77 

0.29 

0.50 

10 

0.47 

O.*81 

0.90 

0.92 

0.83 

0.79 

0.54 

0.59 

0.99 

0.88 

1.35 

0.86 

0.83 

11 

0.92 

1.10 

0.97 

0.92 

0.99 

0.96 

0.61 

0.72 

0.97 

1.08 

1.71 

1.19 

1.01 

Midn.  .  . 

1.24 

1.26 

0.92 

0.95 

1.15 

0.99 

0.70 

0.83 

0.88 

1.26 

1.91 

1.37 

1.13 

6.  6 

0.81 

0.68 

0.68 

0.50 

0.38 

0.34 

0.43 

0.25 

0.45 

0.68 

0.70 

0.86 

0.56 

7.  7 

1.10 

0.95 

0.83 

0.56 

0.38 

0.47 

0.52 

0.41 

0.63 

0.74 

0.95 

1.28 

0.74 

8.  8 

1.08 

0.97 

0.77 

0.50 

0.27 

0.50 

0.45 

0.45 

0.63 

0.63 

0.95 

1.35 

0.72 

9.  9 

0.79 

0.72 

0.47 

0.29 

0.09 

0.38 

0.27 

0.36 

0.47 

0.34 

0.70 

1.08 

0.50 

10.10 

0.27 

0.29 

0.07 

0.00 

-0.11 

0.18 

0.02 

0.20 

0.18 

-0.05 

0.25 

0.52 

0.16 

7.  2.  9 

-0.14 

-0.02 

0.09 

-0.05 

-0.20 

-0.16 

-0.20 

-0.18 

-0.07 

-0.14 

-0.18 

-0.09 

-0.11 

6.  2.  8 

-0.32 

-0.18 

0.05 

0.02 

-0.11 

-0.16 

-0.16 

-0.20 

-0.05 

-0.11 

-0.32 

-0.32 

-0.16 

6.  2.10 

0.11 

0.27 

038 

0.25 

0.09 

0.07 

-0.16 

-0.07 

0.14 

0.18 

0.14 

0.14 

0.14 

6.  2.  6 

-0.79 

-0.74 

-0.50 

-0.52 

-0.52 

-0.59 

-0.29 

-0.50 

-0.45 

-0.61 

-0.90 

-0.97 

-0.61 

7.  2 

-0.16" 

-0.14 

-0.16 

-0.43 

-0.61 

-0.50 

-0.56 

-0.50 

-0.52 

-0.47 

-0.65 

-0.29 

-0.41 

8.  2 

-0.52 

-0.56 

-0.63 

-0.88 

-0.99 

-0.77 

-0.70 

-0.63 

-0.74 

-0.92 

-1.08 

-0.68 

-0.77 

8.  1 

-0.36 

-0.41 

-0.54 

-0.79 

-0.92 

-0.63 

-0.72 

-0.52 

-0.68 

-0.86 

-1.01 

-0.43 

-0.65 

7.  1 

0.00 

0.02 

-0.07 

-029 

-0.54 

-0.36 

-0.59 

-0.38 

-0.45 

-0.41 

-0.56 

-0.05 

-0.32 

9.12.3.9 

-1.28 

-1.22 

-1.06 

-0.99 

-1.01 

-0.83 

-0.61 

-0.65 

-0.77 

-1.24 

-1.44 

-1.37 

-1.04 

7.  2.2(9) 

-0.14 

0.05 

0.20 

0.16 

0.00 

0.02 

-0.02 

-0.02 

0.18 

0.02 

0.07 

0.00 

0.05 

E 


The  numbers  without  sign  must  be  added;  those  with  the  sign  —  must  be  subtracted. 

35 


XXIII. 

INDIA.  —  BOMBAY.     Lat.  18°  56'  N.     Long.  72°  54'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.66 

0.62 

0.44 

0.50 

0.63 

0.51 

0.35 

0.43 

038 

0.66 

0.90 

0.69 

0.56 

2 

0.80 

0.75 

0.59 

0.67 

0.79 

0.62 

0.39 

0.50 

0.43 

0.83 

0.97 

0.83 

0.68 

3 

1.01 

0.98 

0.85 

0.91 

0.95 

0.75 

0.40 

0.55 

0.55 

1.03 

1.09 

1.07 

0.85 

4 

1.27 

1.26 

1.15 

1.10 

1.03 

0.85 

0.40 

0.58 

0.68 

1.22 

1.25 

1.38 

1.01 

5 

1.54 

1.51 

1.35 

1.16 

0.99 

0.87 

0.38 

0.58 

0.76 

1.31 

1.38 

1.68 

1.13 

6 

1.70 

1.61 

1.36 

1.04 

0.80 

0.80 

0.35 

0.55 

0.74 

1.24 

1.40 

1.85 

1.12 

7 

1.64 

1.48 

1.13 

0.74 

0.51 

0.63 

0.29 

0.46 

0.54 

0.98 

1.24 

1.78 

0.95 

8 

1.32 

1.10 

0.70 

0.34 

0.16 

0.39 

0.17 

0.33 

0.35 

0.57 

0.85 

1.44 

0.64 

9 

0.75 

0.54 

0.17 

-0.06 

-0.18 

0.10 

-0. 

0.14 

0.04 

0.07 

0.28 

0.83 

0.22 

10 

0.03 

-0.10 

-0.34 

-0.40 

-0.47 

-0.19 

-0.23 

-0.09 

-0.29 

-0.42 

-0.37 

0.07 

-0.23 

11 

-0.69 

-0.69 

-0.74 

-0.66 

-0.69 

-0.48 

-0.48 

-0.35 

-0.57 

-0.85 

-0.98 

-0.71 

-0  66 

Noon.  .  . 

-1.27 

-1.16 

-1.02 

-0.85 

-0.86 

-0.73 

-0.69 

-0.60 

-0.80 

-1.15 

-1.46 

-1.37 

-1.00 

1 

-1.64 

-1.46 

-1.18 

-1.00 

-0.98 

-0.94 

-0.81 

-0.79 

-0.94 

-1  33 

-1.74 

-1.82 

-1.22 

2 

-1.77 

-1.60 

-1.26 

-1.11 

-1.04 

-1.07 

-0.79 

-0.89 

-1.00 

-1  39 

-1.81 

-2.04 

-1.31 

3 

-1.71 

-1.62 

-1.27 

-1.16 

-1.03 

-1.09 

-0.64 

-0.88 

-0.96 

-1  33 

-1.71 

-2.02 

-1.29 

4 

-1.52 

-1.52 

-1.21 

-1.11 

-0.93 

-1.00 

-0.41 

-0.75 

-0.83 

-1.18 

-1.48 

-1.83 

-1.15 

5 

-1.26 

-1.31 

-1.04 

-0.92 

-0.73 

-0.79 

-0.17 

-0.55 

-0.61 

-0.95 

-1.16 

-1.50 

-0.92 

6 

-0.97 

-1.01 

-0.76 

-0.61 

-0.46 

-0.51 

0.04 

-0.32 

-0.33 

-0.65 

-0.79 

-1.09 

-0.62 

7 

-0.66 

-0.64 

-0.39 

-0.24 

-0.17 

-0.21 

0.17 

-0.10 

0.02 

-0.32 

-0.39 

-0.65 

-0.30 

8 

-0.35 

-0.25 

0.03 

0.10 

0.08 

0.06 

0.22 

0.0? 

0.21 

-0.01 

0. 

-0.23 

-001 

9 

-0.05 

0.10 

0.25 

0.32 

0.26 

0.24 

0.24 

0.19 

0.38 

0.23 

0.34 

0.13 

0.22 

10 

0.21 

0.36 

0.40 

0.41 

0.37 

0.35 

0.24 

0.26 

0.44 

0.39 

060 

0.38 

0.37 

11 

0.41 

0.49 

0.43 

0.41 

0.44 

0.10 

0.27 

0.32 

0.43 

0.48 

0.76 

0.53 

0.45 

Midn.  .  . 

0.55 

0.56 

0.41 

0.42 

0.51 

0.44 

0.31 

0.37 

0.39 

0.56 

0.85 

0.61 

0.50 

6.  6 

0.36 

0.30 

0.30 

0.22 

0.17 

0.15 

0.19 

0.11 

0.20 

0.30 

0.31 

038 

0.25 

7.  7 

0.49 

0.42 

0.37 

0.25 

0.17 

0.21 

0.23 

0.18 

0.28 

0.33 

0.42 

057 

0.33 

8.  8 

0.48 

0.43 

0.34 

0.22 

0.12 

0.22 

0.20 

0.20 

0.28 

0.28 

042 

0.60 

0.32 

9.  9 

0.35 

0.32 

0.21 

0.13 

0.04 

0.17 

0.12 

0.16 

0.21 

0.15 

0.31 

0.48 

0.22 

10.10 

0.12 

0.13 

0.03 

0.00 

-0.05 

0.08 

0.01 

0.09 

0.08 

-0.02 

0.11 

0.23 

0.07 

7.  2.  9 

-0.06 

-0.01 

0.04 

-0.02 

-0.09 

-0.07 

-0.09 

-0.08 

-0.03 

-0.06 

-0.08 

-0.04 

-0.05 

6.  2.  8 

0.14 

-0.08 

0.02 

0.01 

-0.05 

-0.07 

-0.07 

-0.09 

-0.02 

-0.05 

-0.14 

-0.14 

-0.07 

6.  2.10 

0-05 

0.12 

0.17 

0.11 

0.04 

0.03 

-0.07 

-0.03 

0.06 

008 

0.06 

0.06 

0.06 

6.  2    6 

-0.35 

-0.33 

-0.22 

-0.23 

-0.23 

-0.26 

-0.13 

-0.22 

-0.20 

-0.27 

-0.40 

-0.43 

-0.27 

7.  2 

-0.07 

-0.06 

-0.07 

-0.19 

-0.27 

-0.22 

-0.25 

-0.22 

-0.23 

-0.21 

-0.29 

-0.13 

-0.18 

8.  2 

-0.23 

-0.25 

-0.28 

-0.39 

-0.44 

-0.34 

-0.31 

-0.28 

-0.33 

-0.41 

-0.-48 

-0.30-0.34 

8.  1 

-0.16 

-0.18 

-0.24 

-0.33 

-0.41 

-0.28 

-0.32 

-023 

-0.30 

-0.38 

-0.45 

-0.19 

-0.29 

7.  1 

0.00 

0.01 

-0.03 

-0.13 

-0.24 

-0.16 

-0.26 

-0.17 

-0.20 

-0.18 

-0.25 

-0.02 

-0.14 

9.12.2.9 

-0.57 

-0.54 

-0.47 

-0.44 

-0.45 

-0.37 

-0.27 

-0.29 

-0.34 

-0.55 

-0.64 

-0.61 

-0.46 

7.  2.2(9) 

-0.06 

0.02 

0.09 

0.07 

0.00 

0.01 

-0.01 

-0.01 

0.08 

0.01 

0.03 

000 

0.02 

Dail.ext. 

-0.04 

-0.01 

0.05 

0.01 

0.00 

-0.11 

-0.21 

-0.16 

-0.12 

-0.04 

-0.21 

-0.10 

-0.09 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

36 


INDIA.  —  MADRAS. 


XXIV. 
Lot.  13°  4'  N. 


Long.  80°  19'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour.       Jan.    j    Feb. 

Marcfi. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct.       Nov. 

Dec. 

i  Year.  |l 

Midn.        0.91 

1.13 

1.00 

.62        .22 

1.35 

1.19 

.27 

.04 

0.82 

0.91 

0.84       1.11 

1 

1.13 

1.45 

1.29 

.37        .47 

1.56 

1.38 

.34 

.20      1.01 

1.13 

1.00 

1.28 

2 

1.32 

1.76 

1.60 

.59        .65 

1.72 

1.58  1      .51 

.38 

1.24 

1.35 

1.17 

1.49 

3          1.48 

2.01 

1.88 

.81        .81 

1.90 

1.75 

.64 

.58 

1.39 

1.56 

1.32 

1.68 

4      |    1.61      2.25 

2.13 

.96        .98 

2.08 

1.92 

.77 

.76 

1.54      1.74 

1.42 

1.85 

5          1-74 

2.44 

2.33 

.98!    2.08 

2.20 

2.07 

.93 

.88 

1.65 

1.88 

1.60 

1.98 

6          1.80 

2.51 

2.27 

1.68 

1.72 

1.87 

1.92      1.81 

.70 

1.46 

1.80 

1.66 

1.85 

7 

i    l.OS 

1.48 

1.13 

0.79     0.92 

1.12 

1.30      1.24        .08 

0.80      1.89 

1.06 

1.07 

O 

-0.02 

0.13 

0.07  -0.08  -0.05 

0.17 

0.47      0.44      0.32 

0.06  -0.25 

0.00 

0.10 

9 

-0.90 

-0.86 

-0.84  -1.07  -1.08 

-0.77 

-0.34  -0.40 

-0.50  -0.56 

-1.11 

-0.77 

-0.77 

10 

-1.45 

-1.60 

-1.63 

-1.84  -2.08 

-1.63 

-1.19  -1.22 

-1.32  -  .04 

-1.57 

-1.36 

-1.49 

11 

-1.79 

-2.14 

-2.14 

-2.15 

-2.56 

-2.23 

-1.89 

-1.85 

-2.02 

-  .41 

-1.82 

-1.61 

-1.47 

Noon. 

.-1.97 

-2.25 

-2.38 

-2.52 

-2.61 

-2.60 

-2.45  -2.H.3 

-2.24 

-  .67 

-1.92 

-1.75 

-2.23 

1 

-1.96-2.38 

-2.41 

-2.46  -2.51 

-2.69 

-2.70-2.56 

-2.24 

-  .66 

-1.89 

-1.72 

-2.26 

2       -1.34  -2.36 

-2.22 

-2.20  -2.22 

-2.53 

-2.67  -2.40 

-2.07  -  .58 

-1.66  -1.60 

-2.11 

3 

-1.54  -2.16 

-1.90 

-1.81 

-1.78 

-2.05 

-2.19  -2.04 

-1.66 

-1.35 

-1.36  -1.28 

-1.76 

4 

-1.07  -1.62 

-1.38 

-1.18 

-1.09 

-1.59 

-1.66 

-1.53 

-1.14 

-1.06 

-0.88 

-0.91 

-1.26 

5 

-0.53 

-1.01 

-0.74 

-0.46 

-0.45 

-0.85 

-0.97 

-0.82 

-0.64 

-0.56 

-0.39 

-0.45 

-0.66 

6 

-0.17-0.49 

-0.23 

0.09 

0.05 

-0.26 

-0.36  -0.31 

-0.23 

-0.28 

-0.11 

-0.17 

-0.21 

7 

0.04  -0.16 

0.07 

0.37 

0.34 

0.16 

0.07 

0.06 

0.03-0.08 

0.04 

0.00 

0.08 

8 

0.24 

0.12 

0.26 

0.44 

0.53 

0.43 

0.37 

0.33 

0.21      0.07 

0.21 

0.15 

0.28 

9 

0.42 

0.36 

0.43 

0.70 

0.70 

0.63 

0.60 

0.52 

0.44     0.22 

0.33 

0.30 

0.47 

10 

0.62 

0.59 

0.62 

0.84 

0.87 

0.94 

0.83 

0.73 

0.62 

0.40 

0.48 

0.46 

0.67 

11 

0.82 

0.83 

0.82 

1.00     1.04 

1.07 

1.02 

0.95 

0.84     0.57 

0.65 

0.64 

0.85 

Mean, 

'19.90 

20.56 

22.33 

23.88   24.49 

24.45 

24.10 

23.34 

22.89 

21.86 

20.68    19.89 

XXV. 

INDIA.  —  BOMBAY.     Lat.  18°  56'  N.    Long.  72°  54'  E.  Greenw.  —  DOVE. 

Degrees  of  Reaumur. 

Hour. 

Jan.        Feb.     March.    April.      May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn. 

1.76      1.68 

1.43 

1.40     1.30 

0.80 

0.57 

0.59 

0.92 

1.36 

1.74 

1.93 

.29 

1 

1.91 

1.88 

1.65 

1.54 

1.40 

0.89 

0.65 

0.64 

0.98 

.52 

1.80 

2.00 

.40 

2 

2.04     2.04 

1.80 

1.75 

1.54 

0.88 

0.63 

1.16 

1.09 

.62 

1.97 

2.18 

.56 

3 

2.18  1    2T.22 

1.90 

1.92 

1.69 

0.94 

0.65 

0.81 

1.18 

.74 

2.11 

2.28 

.63 

4 

2.39 

2.44 

2.26 

2.02 

1.81 

1.04 

0.76 

0.82 

1.25 

.89 

2.23 

2.41 

.78; 

5 

2.65 

2.68 

2.42 

2.26 

1.92 

1.09 

0.83 

0.90 

1.25 

.96 

2.40 

2.62 

.921 

6 

2.88 

2.88 

2.60 

2.20 

1.65     1.03 

0.84 

0.84 

1.21 

2.00 

2.55 

2.66 

1.94 

7 

2.53 

2.37 

1.61 

0.76     0.44     0.60 

0.55 

0.51 

0.61 

1.02 

1.47 

2.08 

1.21 

8 

0.72 

0.48  -1.04 

-0.62  '-0.51  -0.01 

0.02 

0.08 

-0.20  -0.31 

-0.12     0.20 

-0.11 

9 

-1.04  -1.05  -1.49  -1.53  -1.30  -0.46 

-0.46 

-0.45 

-0.84  -1.53  -l'.40  -1.00 

-1.05 

10 

-2.10  -2.29  -2.28  -2.00  -1.73  -0.79  -0.74 

-0.76 

-1.32  -2.17  -2.38  -2.14 

-1.75 

11 

-3.08  -2.98  !  -2.54  -2.20  -2.08 

-1.18  -1.07 

-1.12 

-1.51  -2.38-3.18  -2.94 

-2.19 

'.i 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

37 


XXV. 

INDIA.  —  BOMBAY,  Continued. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour. 

Jan. 

Feb. 

March.    April. 

May. 

June. 

July. 

Aug. 

Sept. 

'  Oct. 

Nov. 

Dec. 

Year. 

Noon. 

-3.40 

-3.29 

-2.52  -2.44 

-2.32 

-1.40 

-1.09 

-1.34 

-1.72 

-2.39 

-3.26 

-3.32 

-2.37 

1 

-3.02 

-3.12 

-2.67  -2.53 

-2.28 

-1.50 

-1.12 

-1.35 

-1.77 

-2.22 

-2.96 

-3.35 

-2.32 

2 

-2.78 

-2.89 

-2.56 

-2.32 

-2.14 

-1.52 

-0.97 

-1.35 

-1.55 

-2.09 

-2.55 

-2.97 

-2.14 

3 

-2.38 

-2.54 

-2.25 

-2.05 

-1.85 

-1.31 

-0.85 

-1.09 

-1.37 

-1.79 

-2.22 

-2.59 

-1.86 

4 

-1.96 

-2.07 

-1.72 

-1.49 

-1.36 

-0.89 

-0.63 

-0.76 

-0.95 

-1.38 

-1.55 

-2.03 

-1.40 

5 

-1.30 

-1.41 

-1.08 

-0.96 

-0.83 

-0.49 

-0.36 

-0.34 

-0.36 

-0.61 

-0.67 

-1.09 

-0.79 

6 

-0.64 

-0.44 

-0.16 

0.00 

0.09 

-0.02 

0.03 

0.13 

0.14 

0.01 

-0.14 

-0.52 

-0.13 

7 

-0.28 

-0.07 

0.19 

0.43 

0.63 

0.22 

0.21 

0.26 

0.28 

0.30 

0.09 

-0.23 

0.17 

8 

0.00 

0.23 

0.48 

0.66 

0.87 

0.39 

0.28 

0.34 

0.44 

0.53 

0.36 

0.10 

0.39 

9 

0.58 

0.63 

0.80 

0.83 

0.92 

0.44 

0.36 

0.41 

0.58 

0.76 

0.85 

0.75 

0.66 

10 

1.16 

1.15 

1.04 

1.09 

0.95 

0.52 

0.41 

0.52 

0.78 

0.96 

1.32 

1.35 

0.94 

11 

1.47 

1.48 

1.20 

1.24 

1.17 

0.71 

0.48 

0.56 

O.S9 

1.18 

1.58 

1.65 

1.18 

Mean. 

18.38 

19.30 

21.00  22.50 

23.43   22.35 

21.67   21.45 

21.42 

22.08 

21.28 

19.54 

XXVI. 

INDIA.  —  CALCUTTA.     Lot.  22°  33'  5"  N.     Long.  88°  19'  2"  E.  Greenw.—  DOVE. 

Degrees  of  Reaumur. 

Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn.  ! 

1.86 

1.69 

2.06 

1.60 

1.90 

1.12 

0.69 

0.69 

0.71 

.00 

1.24 

1.51 

.34 

1 

2.24 

2.00 

2.37 

1.96 

2.06 

1.12 

0.80 

0.78 

0.76 

.17 

1.47 

1.77 

.54 

2 

2.53 

2.22 

2.62 

2.18 

2.21 

1.16 

0.91 

0.85 

0.84 

.26 

1.69 

2.00 

.71 

3 

2.80 

2.44 

2.84 

2.27 

2.32 

1.29 

1.02 

0.92 

0.93 

.26 

1.82 

2.31 

.85 

4 

3.06 

2.71 

3.0S 

2.40 

2.41 

1.29 

1.11 

0.96 

1.04 

.46 

2.00 

2.40 

.99 

5 

3.33 

2.89 

3.28 

2.47 

2.50 

1.34 

1.24 

1.07 

1.16 

.53 

2.22 

2.66 

2.14 

6 

3.53 

3.11 

3.42 

2.53 

2.41 

1.34 

1.24 

1.12 

1.16 

1.62 

2.36 

2.80 

2.22 

7 

3.71 

3.24 

3.42 

2.22 

1.90 

1.03 

0.96 

0.89 

0.93 

0.86 

2.31 

2.93 

2.03 

8 

2.73 

2.20 

1.97 

1.18 

0.81 

0.45 

0.42 

0.32 

0.27 

0.31 

0.93 

1.68 

1.11 

9 

0.91 

0.71 

0.46 

0.11 

-0.34 

-0.13 

-0.16 

-0.22 

-0.24 

-0.47 

-0.13 

0.35 

0.07 

10 

-0.78 

-0.62 

-0.98 

-0.44 

-1.39 

-0.66 

-0.69 

-0.33 

-0.73 

-0.58 

-1.02 

-0.76 

-0.75 

11 

-2.09 

-1.64 

-2.14 

-1.82 

-2.14 

-1.15 

-1.13 

-1.08 

-1.16 

-1.60 

-1.91 

-1.87 

-1.64 

Noon. 

-3.31 

-2.62 

-3.16 

-2.67 

-2.76 

-1.60 

-1.51 

-1.51 

-1.40 

-1.94 

-2.44 

-2.80 

-2.31 

1 

-4.14 

-3.28 

-3.87 

-3.09 

-3.12 

-1.68 

-1.5S 

-1.55 

-1.44 

-2.05 

-2.80 

-3.29 

-2.66 

2 

-4.52 

-3.64 

-4.25 

-3.47 

-3.32 

-1.73 

-1.29 

-1.80 

-1.63 

-2.12 

-3.07 

-3.69 

-2.88 

3 

-4.65 

-3.87 

-4.40 

-3.62 

-3.43 

-1.92 

-1.24 

-1.20 

-1.27 

-1.83 

-2.98 

-3.69 

-2.84 

4 

-3.78 

-3.69 

-4.23 

-3.40 

-3.10 

-1.53-0.96 

-0.95 

-0.91 

-1.49 

-2.18 

-2.76 

-2.41 

5 

-3.07 

-3.13 

-3.36 

-2.73 

-2.43 

-1.20  -0.64 

-0.68 

-0.56 

-0.92 

-1.60 

-2.18 

-1.88 

6 

-1.87 

-1.91 

-1.96 

-1.42 

-1.23 

-0.57-0.31 

-0.31 

-0.16 

-0.25 

-0.76 

-1.34 

-1.01 

7 

-0.96 

-0.93 

-0.78 

-0.31 

-0.14 

-0.11 

-0.07 

-0.09 

0.04 

0.13 

-0.22 

-0.63 

-0.34 

8 

-0.20 

-0.22 

0.00 

0.40 

0.68 

0.20 

0.09 

0.25 

0.22 

0.42 

0.27 

-0.05 

0.17 

9 

0.42 

0.38 

0.73 

0.89 

1.08 

0.49 

0.22 

0.45 

0.33 

0.60 

0.62 

0.44 

0.55 

10 

0.95 

0.80 

1.22 

1.20 

1.46 

0.63 

0.36 

0.56 

0.47 

0.75 

1.07 

0.93 

0.87 

11 

1.37 

1.20 

1.66 

1.54 

1.64 

0.74 

0.49 

0.65 

0.60 

0.88 

1.16 

1.20 

1.09 

Moan. 

15.49 

17.57 

21.19 

22.51 

24.01 

23.29 

22.68 

22.86 

22.42 

21.73 

18.88 

16.36 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

38 


XXVII. 

ASIA.  —  TIFLIS.     Lot.  41°  41'  N.    Long.  45°  17'  E.  Qreenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour.       Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn. 

0.87 

.01 

1.54 

1.81 

1.95 

2.38 

2.43 

2.22 

1.60 

1.38 

0.99 

0.80 

!    1.58 

1 

1.02 

.15 

1.80 

2.10 

2.28 

2.67 

2.79 

2.52 

1.81 

1.64 

1.16 

0.94 

1.82 

2 

1.17 

.33 

2.02 

2.40 

2.58 

2.94 

3.13 

2.82 

2.08 

1.88 

1.37 

.04 

2.06 

3 

1.32 

.47 

2.23 

2.64 

2.84 

3.22 

3.49 

3.13 

2.29 

2.11 

1.59 

.14 

2.28 

1.46 

.57 

2.39 

2.94 

3.14 

3.43 

3.73 

3.44 

2.59      2.39 

1.73 

.25 

2.51 

5 

1.60 

.69 

2.58 

3.12 

3.09 

3.09 

3.55 

3.59 

2.74 

2.62 

1.85 

.35 

2.57 

6 

1.76 

.75 

2.63 

2.89 

2.39 

2.35 

2.77 

3.06 

2.63 

2.77 

1.99 

.40 

2.37 

7 

1.87 

.75 

2.14 

2.19 

1.53 

1.28 

1.50 

2.16 

1.99 

2.38 

1.85 

.42 

1.84 

8 

1.40 

.23 

1.23 

0.99 

0.53 

0.35 

0.70 

1.05      1.07 

1.52 

1.44        .19 

1.06 

9 

0.05 

0.50 

0.16 

-0.22  -0.51 

-0.65 

-0.32 

-0.21   -0.03     0.30 

0.54      0.49 

0.01 

10 

-0.41 

-0.46 

-0.94 

-1.20  -1.41 

-1.66 

-1.35 

-1.32 

-1.15   -0.47 

-0.46 

-0.19 

-0.92 

11 

-1.17 

-1.33 

-1.85 

-2.06 

-2.19 

-2.40 

-2.27 

-2.20  1-2.01  -1.77 

-1.31 

-1.11 

-1.81 

Noon.     -1-91 

-1.94 

-2.64 

-2.77 

-2.89 

-2.42 

-2.99 

-2.89 

-2.67 

-2.53 

-2.07 

-1.76 

-2.46 

1        -2.37 

-2.45 

-3.12 

-3.29  -3.21 

-3.42 

-3.53  -3.60  -3.17  -3.07  -2.50 

-2.21 

-3.00 

2       -2.59 

-2.65 

-3.25 

-3.37  -3.34 

-3.50 

-3.68  -3.85  -3.41 

-3.56  -2.81 

-2.38 

-3.20 

3       -2.33 

-2.58 

-3.21 

-3.41  -3.25 

-3.51 

-3.82  -3.98  -3.37 

-3.41 

-2.55 

-2.08 

-3.12 

4       -1.78 

-2.07 

-2.78 

-3.20  -2.97 

-3.39 

-3.82 

-3.72 

-2.95 

-2.81 

-1.87 

-1.43 

-2.73 

5 

.-0.99 

-1.24 

-2.08 

-2.46 

-2.65 

-2.86 

-3.47 

-3.20 

-1.53 

-1.85 

-1.27  |-0.90 

-2.04 

6       -0.57-0.60  -1.11  -1.56  -1.47 

-1.81  -2.36 

-2.01 

-1.18  -1.17  -0.73-0.49 

-1.23 

7       -0.17  -0.19  -0.48  -0.69-0.45 

-0.63  -0.86 

-0.85 

-0.46  -0.50-0.35  -0.13 

-0.48 

8          0.15     0.19 

0.12 

-0.02 

0.26 

0.23      0.13 

-0.02 

0.18 

0.11 

-0.02 

0.19 

0.121 

9 

0.33 

0.44 

0.51 

0.64 

0.83 

0.92 

0.87 

0.72 

0.61 

0.50 

0.24 

0.36 

0.58 

10 

0.55 

0.65 

0.91 

1.05 

1.28 

1.51 

1.44 

1.33 

1.00 

0.81 

0.48 

0.53 

0.96 

11 

0.69 

0.89 

1.25 

1.45 

1.63 

1.95 

1.96 

1.80 

1.32 

1.10 

0.76 

0.68 

1.29 

Mean. 

-0.20 

3.00 

5.64 

9.99  |13.54 

16.10    19.01    19.43    15.03    11.40    5.07 

2.45 

XXVIII. 

CHINA.  —  PEKING.     Lat.  39°  54'  N.    Long.  116°  26'  E.  Greenw.  —  DOVE. 

Degrees  of  Reaumur. 

Hour. 

Jan. 

Feb.     March.    April.      May. 

June       July.      Aug 

Sept. 

Oct.       NOT- 

Dec 

Year 

Midn. 

1.16 

1.70 

1.83 

1.75     2.19 

2.24      1.61 

1.49 

1.69 

1.64 

1.19 

1.25 

1.64 

1 

1.47 

2.07 

2.19 

2.26     2.76 

2.73      1.89 

1.80 

2.04 

2.05      1.47 

1.39 

2.01 

2 

1.66 

2.35 

2.78 

2.67     3.20 

3.12 

2.23 

2.04 

2.32 

2.37 

1.68 

1.65 

2.34 

3 

1.93 

2.55      2.93 

3.18     3.72 

3.47 

2.50 

2.31 

2.55 

2.62 

1.88 

1.83 

2.62 

4 

2.13 

2.81 

3.27 

3.57     4.13 

3.82 

2.74 

2.54 

2.97 

2.92 

2.01 

2.46 

2.95 

5 

2.41 

2.94 

3.57 

3.89     4.30 

3.88 

2.78 

2.71 

3.10 

3.19 

2.20 

2.10 

3.09 

| 

6 

2.58 

3.15 

3.65 

3.81      3.37     2.86 

2.10 

2.46 

2.96      3.43 

2.32 

2.18 

2.91 

7 

2.63 

3.21 

3.19 

2.91      2.30      1.95 

1.34 

1.65 

2.10     2.98 

2.30 

2.29 

2.40 

8 

2.23 

2.37 

1.84 

1.65 

1.19      1.07 

0.52 

0.76 

0.87 

1.68 

1.39 

1.73 

1.44 

9 

0.77 

0.70 

0.49 

0.34     0.00     0.03  -0.12 

-0.20 

-0.24     0.15 

0.19 

0.31 

0.20 

10 

-0.57  -0.65  -0.81  -0.79  -1.20-1.06  -0.97 

-1.09  -1.36  -1.05 

-0.84  -0.97 

-0.95 

11 

-1.35  -1.90  -1.93-2.03  -1.24  -2.17-1.71 

-1.67  -2.17  -2.18  1-1.74  -1.96 

-1.84 

The  numbers  without  sign  must  be  added  ;  those  with  the  sign — must  be  subtracted. 

39 


XXVIII. 

CHINA.  —  PEKING,  Continued. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur 


Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov.        Dec. 

Year. 

Noon. 

-2.S3 

-2.80 

-2.95 

-2.92 

-3.05 

-2.92 

-2.24 

-2.02-2.77  -3.03 

-2.39 

-2.64 

-2.71 

1 

-3.01 

-3.54 

-3.54 

-3.59 

-3.74 

-3.55 

-2.65 

-2.64 

-3.10  -3.65 

-2.87 

-3.18 

-3.25 

2 

-3.37 

-3.84 

-4.03 

-3.98 

-4.08 

-3.97 

-2.88 

-2.90 

-3.38  -3.96  -3.07  -3.41 

-3.57 

3 

-3.40 

-3.94 

-4.12 

-4.06 

-4.24 

-4.00 

-2.85 

-2.94 

-3.44  -3.97  -2.  88!  -2.74 

-3.55 

4 

-2.88 

-3.65 

-3.92 

-3.86 

-4.03 

-3.74 

-2.74 

-2.79 

-3.06  -2.43 

-2.23  -2.50 

-3.15 

5 

-1.79 

-2.83 

-3.21 

-3.24 

-3.65 

-3.31 

-2.36 

-2.20 

-2.34 

-2.34 

-1.18 

-1.34 

-2.48 

6 

-0.97 

-1.79 

-2.20 

-2.34 

-3.04 

-2.44 

-1.76 

-1.45 

-1.18 

-1.12 

-0.59 

-0.64 

-1.63 

7 

-0.48 

-0.15 

-1.05 

-1.13 

-1.18 

-1.21 

-0.72 

-0,45 

-0.50-0.54 

-0.48 

-0.26 

-0.68 

8 

-0.02  -0.27 

-0.30 

-0.33 

-0.19 

-0.11 

0.12 

0.08 

0.09  -0.02 

0.01 

0.18 

-0.06 

9 

0.30     0.26 

0.26 

0.24 

0.59 

-0.59 

0.63 

0.51 

0.57      0.42 

0.30 

0.54 

0.43 

10 

0.57 

0.73 

0.83 

0.84 

1.15 

1.14 

1.04     0.83 

0.97     0.86 

0.59 

0.77 

0.86 

11 

0.90 

1.20 

1.30 

1.28 

1.67 

1.65 

1.35      1.18 

1.32      1.00 

0.81 

1.01 

1.22 

Mean. 

-3.57  -2.04 

3.42 

9.66 

15.83 

19.61 

21.27   19.30 

15.68     9.61 

1.79 

-2.44 

XXIX. 

SIBERIA.  —  NERTCHINSK.     Lat.  51°  18'  N.     Long.  117°  20'  E.  Gr.  —  DOVE. 

Degrees  of  Reaumur. 

Hour. 

Jan. 

Feb.     March. 

April. 

May. 

June. 

July. 

Aug.       Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn. 

0.78 

1.38     1.92 

2.53 

3.10 

3.13 

2.63 

2.51 

2.12 

1.66 

0.96 

0.75 

1.96 

1 

1.06 

1.61 

2.25 

2.95 

3.71 

3.55 

3.00 

2.87 

2.58 

1.98 

1.22 

0.94 

2.31 

2 

1.24 

1.84 

2.65 

3.36 

4.20 

3.98 

3.34 

3.25 

2.93 

2.27 

1.42 

1.16 

2.64 

3 

1.45 

2.15 

3.02 

3.75 

4.78 

4.32 

3.64 

3.57 

3.28 

2.57 

1.70 

1.33 

2.96 

4 

1.70 

2.40 

3.38 

4.09 

5.04 

4.29 

3.86 

3.79 

3.62 

2.80 

1.91 

1.45 

3.19 

5 

1.93 

2.72 

3.70 

4.15 

3.97 

3.27 

3.17 

3.68 

3.97 

3.00 

2.06 

1.63 

3.10 

6 

2.08 

2.94 

3.89 

2.96 

2.31 

2.03 

1.99 

2.61 

3.63 

3.16 

2.15 

1.76 

2.63 

7 

2.26 

3.00 

2.88 

1.43 

0.82 

0.74 

1.01 

1.31 

2.07 

2.46 

2.35 

1.95 

1.86 

8 

2.20 

1.82 

1.36 

0.19 

-0.53 

-0.45 

-1.28 

0.11 

0.66 

0.84 

1.61 

1.98 

0.71 

9 

0.56 

-0.20  -0.12 

-1.32 

-1.77 

-1.59 

-1.25 

-1.08 

-0.72 

-0.69 

-0.03 

0.62 

-0.63 

10 

-0.96 

-1.27  -1.71 

-2.35 

-2.73 

-2.52 

-2.13 

-2.10 

-1.99 

-1.S2 

-1.17 

-0.89 

-1.80 

11 

-1.90 

-2.34 

-2.61 

-3.08 

-3.34 

-3.17 

-2.79 

-2.91 

-2.94 

-2.78 

-2.12 

-1.85 

-2.65 

Noon. 

-2.70 

-3.16 

-3.43 

-3.70 

-3.82 

-3.62 

-3.28 

-3.49 

-3.71 

-3.41 

-2.84 

-2.58 

-3.31 

1 

-3.06 

-3.75  -3.96 

-4.01 

-4.08 

-3.80 

-3.58 

-3.76 

-4.09 

-3.75 

-3.09 

-2.85 

-3.65 

2 

-3.00 

-3.80:  -4.  23 

-4.08 

-4.10 

-3.73 

-3.66 

-3.92 

-4.20 

-3.66 

-2.97 

-2.52 

-3.66 

3 

-2.50 

-3.47  -4.03 

-3.84 

-3.99 

-3.59 

-3.48 

-3.79 

-3.86 

-3.26 

-2.27 

-1.87 

-3.33 

4 

-1.54 

-2.73 

-3.53 

-3.48 

-3.55 

-3.24 

-3.02 

-3.21 

-3.34 

-2.43 

-1.34 

-0.96 

-2.70 

5 

-0.71 

-1.61 

-2.75 

-2.85 

-3.02 

-3.73 

-2.38 

-2.56 

-2.48 

-1.42 

-0.87 

-0.43 

-1.98 

6 

-0.28 

-0.63 

-1.71 

-1.97 

-2.27 

-2.06 

-1.73 

-1.68 

-1.22 

-0.50 

-0.10 

-0.17 

-1.20 

7 

0.02 

0.01 

-0.34 

-0.34 

-0.93 

-0.93 

-0.82 

-0.66 

-0.49 

-0.24 

-0.17 

-0.70 

-0.47 

8 

0.13 

0.39 

0.24 

0.61 

0.27 

0.97 

0.37 

0.41 

0.34 

0.30 

0.06 

0.08 

0.29 

9 

0.27 

0.63 

0.66 

1.19 

1.34 

1.32 

1.24 

1.30 

0.89 

0.64 

0.34 

0.22 

0.84 

10 

0.43 

0.86 

1.06 

1.72 

1.92 

2.02 

1.78 

1.70 

1.30 

1.01 

0.54 

0.43 

1.23 

11 

0.57 

1.16 

1.47 

2.17 

2.63 

2.63 

2.29 

2.14 

1.71 

1.31 

0.75 

0.56 

1.62 

Mean. 

-21.94-17.84  -8.35|  0.04 

7.51 

1.78 

13.  9i    11.91 

6.55 

-1.80 

-13.44-21.36 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

40 


XXX. 

SIBERIA.  —  NERTCHINSK.     Lot.  51°  18'  N.     Long.  119°  21'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.91 

1.42 

2.07 

2.69 

4.07 

4.29 

3.07 

3.00 

2.16 

2.31 

0.76 

0.66 

2.28 

2 

1.00 

1.68 

2.57 

3.29 

4.69 

4.71 

3.46 

3.48 

2.96 

2.79 

0.96 

0.74 

2.69 

3 

1.15 

2.08 

3.16 

3.78 

5.08 

4.90 

3.75 

3.89 

3.27 

3.26 

1.26 

0.84 

3.04 

4 

1.42 

2.52 

3.63 

3.97 

4.98 

4.70 

3.76 

4.04 

3.81 

3.61 

1.66 

1.07 

3.26 

5 

1.78 

2.84 

3.73 

3.69 

4.24 

3.96 

3.37 

3.72 

3.94 

3.66 

2.06 

1.41 

3.20 

6 

2.07 

2.80 

3.28 

2.88 

2.86 

2.67 

2.54 

2.89 

3.15 

3.30 

2.30 

1.75 

2.71 

7 

2.06 

2.28 

2.31 

1.63 

1.07 

0-99 

1.37 

1.62 

2.38 

2.47 

2.18 

1.87 

1.85 

8 

1.60 

1.28 

0.99 

0.16 

0.78 

-0.79 

0.06 

0.15 

0.87 

1.24 

1.58 

1.59 

0.66 

9 

0.65 

-0.05 

-0.41 

-1.26 

-2.33 

-2.34 

-1.19 

-1.25 

-0.70 

-0.23 

0.55 

0.87 

-0.64 

10 

-0.59 

-1.43 

-1.67 

-2.42 

-3.40 

-3.41 

-1.98 

-2.38 

-1.74 

-1.70 

-0.69 

-0.17 

-1.80 

11 

-1.79 

-2.58 

-2.64 

-3.22 

-3.98 

-3.97 

-2.92 

-3.15 

-2.99 

-2.96 

-1.84 

-1.23 

-2.77 

Noon.  .  . 

-2.61 

• 

-3.29 

-3.25 

-3.64 

-4.19 

-4.12 

-3.38 

-3.61 

-3.49 

-3.84 

-2.60 

-2.01 

-3.34 

1 

-2.87 

-3.49 

-3.61 

-3.76 

-4.22 

-4.05 

-3.64 

-3.83 

-3.69 

-4.25 

-2.81 

-2.30 

-3.54 

2 

-2.56 

-3.27 

-3.74 

-3.65 

-4.18 

-3.92 

-3.72 

-3.88 

-4.00 

-4.20 

-2.50 

-2.08 

-3.48 

3 

-1.89 

-2.76 

-3.65 

-3.33 

-4.03 

-3.77 

-3.62 

-3.75 

-3.54 

-3.77 

-1.87 

-1.54 

-3.13 

4 

-1.14 

-2.12 

-3.31 

-2.84 

-3.69 

-3.54 

-3.29 

-3.40 

-3.24 

-3.08 

-1.17 

-0.92 

-2.65 

5 

-0.56 

-1.45 

-2.65 

-2.17 

-3.04 

-3.07 

-2.68 

-2.76 

-2.68 

-2.24 

-0.61 

-0.47 

-2.03 

6 

-0.23 

-0.81 

-1.78 

-1.39 

-2.08 

-2.30 

-1.82 

-1.86 

-1.54 

-1.36 

-0.27 

-0.25 

-1.31 

7 

-0.11 

-0.21 

-0.77 

-0.56 

-0.92 

-1.23 

-0.81 

-0.80 

-0.86 

-0.54 

-0.12 

-0.23 

-0.60 

8 

-0.04 

0.31 

0.18 

0.20 

0.26 

0.00 

0.20 

0.24 

0.17 

0.17 

-0.25 

-0.24 

0.12 

9 

0.09 

0.74 

0.90 

0.82 

1.29 

1.21 

1.06 

1.11 

0.97 

0.74 

0.05 

-0.17 

0.73 

10 

0.31 

1.02 

1.34 

1.29 

2.11 

2.25 

1.51 

1.74 

1.17 

1.18 

0.20 

0.02 

1.18 

11 

0.57 

1.19 

1.56 

1.71 

2.78 

3.09 

2.23 

2.19 

1.73 

1.54 

0.39 

.0.28 

1.61 

Midn.  .  . 

0.78 

1.29 

1.76 

2.15 

3.41 

3.75 

2.65 

2.57 

1.88 

1.90 

0.58 

0.52 

1.94 

6.  6 

0.92 

1.00 

0.75 

0.75 

0.39 

0.19 

0.36 

0.52 

0.80 

0.97 

1.01 

0.75 

0.70 

7.  7 

0.98 

1.04 

0.77 

0.53 

0.07 

-0.12 

0.28 

0.41 

0.76 

0.97 

1.03 

0.82 

0.63 

8.  8 

0.78 

0.80 

0.58 

0.18 

-0.26 

-0.39 

0.13 

0.20 

0.52 

0.71 

0.77 

0.67 

0.39 

9.  9 

0.37 

0.34 

0.24 

-0.22 

-0.52 

-0.56 

-0.06 

-0.07 

0.13 

0.26 

0.30 

0.35 

0.05 

10.10 

-0.14 

-0.20 

-0.16 

-0.57 

-0.65 

-0.58 

-0.24 

-0.32 

-0.29 

-0.26 

-0.25 

-0.07 

-0.31 

7.  2.  9 

-0.14 

-0.08 

-0.18 

-0.40 

-0.61 

-0.57 

-0.43 

-0.38 

-0.22 

-0.33 

-0.09 

-0.13 

-0.30 

6.  2.  8 

-0.18 

-0.05 

-0.09 

-0.19 

-0.35 

-0.42 

-0.33 

-0.25 

-0.23 

-0.24 

-0.08 

-0.19 

-0.22 

6.  2.10 

-0.06 

0.18 

0.29 

0.17 

0.26 

0.33 

0.11 

0.25 

0.11 

0.09 

0.00 

-0.01 

0.14 

6.  2.  6 

-0.24 

-0.43 

-0.75 

-0.72 

-1.13 

-1.18 

-1.00 

-0.95 

-0.80 

-0.75 

-0.16 

-0.19 

-0.69 

7.  2 

-0.41 

-0.61 

-0.65 

-0.07 

-1.58 

-1.53 

-1.14 

-1.11 

-0.66 

-0.89 

-0.32 

-0.22 

-0.85 

8.  2 

-0.94 

-1.34 

-1.60 

-1.85 

-2.32 

-2.26 

-1.78 

-1.88 

-1.69 

-1.78 

-0.97 

-0.71 

-1.59 

8.  1 

-0.08 

0.12 

0.09 

-0.10 

-0.13 

-0.13 

-0.06 

-0.01 

0.08 

-0.06 

-0.06 

-0.14 

-0.04 

7.  1 

-0.25 

-0.50 

-0.72 

-1.01 

-1.56 

-1.47 

-1.18 

-1.13 

-0.81 

-0.87 

-0.16 

-0.11 

-0.81 

9.12.3.9 

-0.48 

-1.00 

-1.38 

-1.75 

-2.48 

-2.36 

-1.83 

-1.87 

-1.57 

-1.48 

-0.46 

-0.25 

-1.41 

7.  2.2(9) 

-0.64 

-1.11 

-1.31 

-1.80 

-2.50 

-2.42 

-1.79 

-1.84 

-1.41 

-1.51 

-0.62 

-0.36 

-1.44 

Dail.ext. 

-0.40 

-0.33 

-0.01 

-0.11 

0.43 

0.39 

0.02 

0.08 

-0.03 

-0.30 

-0.26 

-0.22 

-0.14 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

41 


XXXI. 

SIBERIA.  —  BARNAUL.     Lat.  53°  20'  N.     Long.  83°  27'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Fahrenheit. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

2.54 

1.85 

4.70 

5.49 

8.82 

7.83 

8.37 

7.11 

5.45 

3.06 

2.48 

1.82 

495 

2 

2.81 

2.14 

5.47 

6.30 

10.19 

8.87 

9.77 

8.35 

6.50 

3.78 

2.97 

2.00 

5.76 

8 

2.70 

2.48 

6.28 

7.07 

10.96 

9.59 

10.69 

9.52 

7.65 

4.52 

3.35 

2.07 

6.41 

4 

2.39 

2.81 

7.02 

7.45 

10.76 

9.14 

10.67 

10.15 

8.48 

5.15 

3.71 

2.18 

6.66 

5 

2.07 

3.13 

7.43 

7.09 

9.32 

7.58 

9.50 

9.77 

8.60 

5.47 

4.6l 

2.45 

6.37 

6 

1.96 

3.33 

9.38 

5.87 

6.68 

5.45 

7.18 

8.12 

5.58 

5.29 

4.16 

2.79 

5.65 

7 

2.00 

3.20 

5.90 

3.87 

3.38 

2.50 

4.05 

5.36 

2.70 

4.46 

3.96 

2.99 

3.94 

8 

1.98 

2.59 

3.71 

1.37 

-0.11 

-0.18 

0.70 

1.96 

2.97 

3.15 

2.70 

1.96 

9 

1.53 

1.37 

0.86 

-1.28 

-3.02 

-2.48 

-2.32 

-1.44 

-0.56 

0.99 

1.64 

1.73 

-0.25  • 

10 

0.45 

-0.36 

-2.18 

-3.74 

-5.06 

-4.61 

-4.68 

-4.32 

-3.67 

-1.22 

-0.41 

0.11 

-2.48 

11 

-1.22 

-2.30 

-4.91 

-5.78 

-6.35 

-5.99 

-6.35 

-6.48 

-6.21 

-3-31 

-2.61 

-1.76 

-4.43 

Noon.  «  • 

-3.08 

-4  03 

-6.89 

-7.34 

-7.20 

-7.31 

-7.52 

-7.97 

-7.99 

-5.00 

-4.48 

-3.42 

| 

-6.01 

1 

-4.59 

-5.13 

-797 

-8.35 

-8.03 

-8.39 

-8.42 

-8.96 

-8;96 

-6.05 

-5.58 

-4.39 

-7.07 

2 

-5.27 

-5.38 

-8.21 

-8.71 

-8.78 

-8.78 

-9.16 

-9.63 

-9*23 

-6.39 

-5.72 

-4.48 

-7.47 

3 

-4.93 

-4.77 

-7.76 

-8.39 

-9.41 

-8  91 

-9.56 

-9.88 

-8.82 

-6.05 

-502 

-3.78 

-7.27 

4 

-3.78 

-3.56 

-6.84 

-7.34 

-9.50 

-8.01 

-9.36 

-9.50 

-7.81 

-5.22 

-3.85 

-2.68 

-6.46 

5 

-2.25 

-2.14 

-5.65 

-5.58 

-8.66 

-6.32 

-8.35 

-8.28 

-6.26 

-4.05 

-2.57 

-1.60 

--5\15 

6 

-0.90 

-0.83 

-6.46 

-3.35 

-6.82 

-4.39 

-6.48 

-6.19 

-4.25 

-2.75 

-1.55 

-0.83 

-3.74 

7 

0.02 

0.09 

-2.61 

-1.04 

-4.16 

-1.94 

-4.01 

-3.51 

-207 

-1.49 

-0.86 

-0.43 

-1.82 

8 

0.47 

0.63 

-0.97 

1.04 

-1.31 

0.11 

-1.31 

-0.68 

0.02 

-0.36 

-0.41 

-023 

-0.25 

9 

0.70 

0.92 

0.63 

2.61 

1.46 

1.80 

1.24 

1.80 

1.76 

0.54 

0.00 

0.00 

1.13 

10 

0.95 

1.10 

2.00 

3.62 

3.78 

3.49 

3.38 

3.67 

2.99 

1.28 

0.52 

0.38 

2.27 

11 

1.42 

1.28 

3.13 

4.25 

5.69 

4.75 

5.20 

4.97 

3.85 

1.87 

1.15 

0.92 

3.22 

Mldn.  .  . 

2.03 

1.55 

3.98 

4.82 

7.36 

6.26 

682 

6.03 

4.59 

2.45 

1.85 

1.44 

4.10 

6.  6 

0.54 

1.24 

1.46 

1.26 

-0.07 

0.54 

0.34 

0.97 

1.69 

1.28 

1.31 

099 

0.97 

7.  7 

1.01 

1.64 

1.64 

1.42 

-0.41 

0.27 

0.02 

0.92 

1.76 

1.49 

1.55 

1  28 

1.06 

8.  8 

1.24 

1.62 

1.37 

1.22 

-0.72 

-005 

-0.29 

0.65 

1.35 

1.31 

1.37 

1.24 

0.86 

9.  9 

1.10 

1.15 

0.74 

0.68 

-0.79 

-0.34 

-0.54 

0.18 

0.59 

0.77 

0.83 

0.86 

0.43 

10.10 

0.70 

0.38 

-0.09 

-0.07 

-0.63 

-0.56 

-0.65 

-0.34 

-0.34 

0.05 

007 

0.25 

-0.11 

7.  2.  9 

-0.86 

-0.43 

-0.56 

-0.74 

-1.31 

-1.49 

-1.28 

-0.83 

-0.63 

-0.47 

-0.59 

-0.50 

-0.81 

6.  2.  8 

-0.95 

-0.47 

0.07 

-0.61 

-1.13 

-1.08 

-1.10 

-0.72 

-0.52 

-0.50 

-065 

-0.63 

-0.70 

6.  2.10 

-0.79 

-0.32 

1.06 

0.27 

0.56 

005 

0.47 

0.72 

0.47 

0.07 

-0.34 

-0.43 

0.16 

6.  2.  6 

-1.10 

-0.97 

-1.76 

-2.07 

-2.97 

-2.57 

-2.81 

-2.57 

-1.94 

-1.28 

-1.04 

083 

-1.85 

7.  2 

-1.64 

-1.09 

-1.16 

-2.42 

-2.70 

-3.14 

-2.56 

-2.14 

-1.83 

-097 

-0.88 

-0.75 

-1.77 

8.  2 

-1.65 

-1.40 

-2  25 

-3.67 

-4-45 

-4.48 

-4.23 

-3.84 

-3.27 

-1.71 

-1.29 

-0.89 

-276 

8.  1 

-1.31 

-1.27 

—2.13 

-3.49 

-4.07 

-4.29 

-3.86 

-3.50 

-3.13 

-1.54 

-1.22 

-0.85 

-2.56 

7.  1 

-1.30 

-0.97 

-1.04 

-2.24 

-2  .33 

-2.95 

-2.19 

-1.80 

-1.69 

-0.80 

-0.81 

-0.70 

-1.57 

9.12.39 

-1.45 

-1.62 

-3.29 

-3.60 

-4.55 

-4.23 

-4.5"> 

-4.37 

-392 

-2.39 

-1.96 

-1.37 

-3.11 

7.  2.2(9) 

-0.47 

-0.09 

-0.27 

0.09 

-0.63 

-0.68 

-0.65 

-0.18 

-0.05 

-0.23 

-0.45 

-0.38 

-0.34 

Bail.  ext. 

-1.24 

-1.04 

0.59 

-0.63 

0.74 

0.34 

0.56 

0.14 

-032 

-0.47 

-079 

-0.74 

-0.41 

The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted 

E  42 


XXXII. 

SIBERIA.  —  BARNAUL.     Lat.  53°  20'  N.     Long.  83°  27'  E..  G-reenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nor. 

Dec. 

Mean. 

Morn.  1 

1.13 

0.82 

2.09 

2.44 

3.92 

3.48 

3.72 

3.16 

2.42 

1.36 

.10 

0.81 

2.20 

2 

1.25 

0.95 

2.43 

2.80 

4.53 

3.94 

4.34 

3.71 

2.89 

1.68 

.32 

0.89 

2.56 

3 

1.20 

.10 

2.79 

3.14 

4.87 

4.26 

4.73 

4.23 

3.40 

2.01 

.49 

0.92 

2.85 

4 

1.06 

.25 

3.12 

3.31 

4.78 

4.06 

4.74 

4.51 

3.77 

2.29 

.65 

0.97 

2.96 

5 

0.92 

.39 

3.30 

3.15 

4.14 

3.37 

4.22 

4.34 

3.82 

2.43 

.78 

1.09 

2.83 

6 

0.87 

.48 

4.17 

2.61 

2.97 

2.42 

3.19 

3.61 

3.40 

2.35 

.85 

1.24 

2.51 

7 

0.89 

.42 

2.62 

1.72 

1.50 

1.11 

1.80 

2.38 

2.48 

1.98 

1.76 

1.33 

1.75 

8 

0.88 

.15 

1.65 

0.61 

-0.05 

-0.08 

0.31 

0.87 

1.20 

1.32 

1.40 

1.20 

0.87 

9 

0.68 

0.61 

0.38 

-0.57 

-1.34 

-1.10 

-1.03 

-0.64 

-0.25 

0.44 

0.73 

0.77 

-0.11 

10 

0.20 

-0.16 

-0.97 

-1.66 

-2.25 

-2.05 

-2.08 

-1.92 

-1.63 

-0.54 

-0.18 

0.05 

-1.10 

11 

-0.54 

-1.02 

-2.18 

-2.57 

-2.82 

-2.66 

-2.82 

-2.88 

-2.76 

-1.47 

-1.16 

-0.78 

-1.97 

Noon.  .  . 

-1.37 

-1.79 

-3.06 

-3.26 

-3.20 

-3.25 

-3.34 

-3.54 

-3.55 

-2.22 

-1.99 

-1.52 

-2.67 

1 

-2.04 

-2.28 

-3.54 

-3.71 

-3.57 

-3.73 

-3.74 

-3.98 

-3.98 

-2.69 

-2.48 

-1.95 

-3.14 

2 

-2.34 

-2.39 

-3.65 

-3.87 

-3.90 

-3.90 

-4.07 

-4.28 

-4.10 

-2.84 

-2.54 

-1.99 

-3.32 

3 

-2.19 

-2.12 

-3.45 

-3.73 

-4.18 

-3.96 

-4.25 

-4.39 

-3.92 

-2.69 

-2.23 

-1.68 

-3.23 

4 

-1.68 

-1.58 

-3.04 

-3.26 

-4.22 

-3.56 

-4.16 

-4.22 

-3.47 

-2.32 

-1.71 

-1.19 

-2.87 

5 

-1.00 

-0.95 

-2.51 

-2.48 

-3.85 

-2.81 

-3.71 

-3.68 

-2.78 

-1.80 

-1.14 

-0.71 

-2.29 

6 

-0.40 

-0.37 

-2.87 

-1.49 

-3.03 

-1.95 

-2.88 

-2.75 

-1.89 

-1.22 

-0.69 

-0.37 

-1.66 

7 

0.01 

0.04 

-1.16 

-0.46 

-1.85 

-0.86 

-1.78 

-1.56 

-0.92. 

-0.66 

-0.38 

-0.19 

-0.81 

8 

0.21 

0.28 

-0.43 

0.46 

-0.58 

0.05 

-0.58 

-0.30 

0.01 

-0.16 

-0.18 

-0.10 

-0.11 

9 

0.31 

0.41 

0.28 

1.16 

0.65 

0.80 

0.55 

0.80 

0.78 

0.24 

0.00 

0.00 

0.50 

10 

0.42 

0.49 

0.89 

1.61 

1.68 

1.55 

1.50 

1.63 

1.33 

0.57 

0.23 

0.17 

1.01 

11 

0.63 

0.57 

1.39 

1.89 

2.53 

2.11 

2.31 

2.21 

1.71 

0.83 

0.51 

0.41 

1.43 

Mian.  .  . 

0.90 

0.69 

1.77 

2.14 

3.27 

2.78 

3.03 

2.68 

2.04 

1.09 

0.82 

0.64 

1.82 

6.  6 

0.24 

0.55 

0.65 

0.56 

-0.03 

0.24 

0.15 

0.43 

0.75 

0.57 

0.58 

0.44 

0.43 

7.  7 

0.45 

0.73 

0.73 

0.63 

-0.18 

0.12 

0.01 

0.41 

0.78 

0.66 

0.69 

0.57 

0.47 

8.  8 

0.55 

0.72 

0.61 

0.54 

-0.32 

-0.02 

-0.13 

0.29 

0.60 

0.58 

0.61 

0.55 

0.38 

9.  9 

0.49 

0.51 

0.33 

0.30 

-0.35 

-0.15 

-0.24 

0.08 

0.26 

0.34 

0.37 

0.38 

0.19 

10.10 

0.31 

0.17 

-0.04 

-0.03 

-0.28 

-0.25 

-0.29 

-0.15 

-0.15 

0.02 

0.03 

0.11 

-0.05 

7.  2.  9 

-0.38 

-0.19 

-0.25 

-0.33 

-0-58 

-0.«Jb- 

-0.57 

-0.37 

-0.28 

-0.21 

-0.26 

-0.22 

-0.36 

6.  2.  8 

-0.42 

-0.21 

0.03 

-0.27 

-0.50 

-0.48 

-0.49 

-0.32 

-0.23 

-0.22 

-0.29 

-0.28 

-0.31 

6.  2.10 

-0.35 

-0.14 

0.47 

0.12 

0.25 

0.02 

0.21 

0.32 

0.21 

0.03 

-0.15 

-0.19 

0.07 

6.  2.  6 

-0.62 

-0.43 

-0.78 

-0.92 

-1.32 

-1.14 

-1.25 

-1.14 

-0.86 

-0.57 

-0.46 

-0.37 

-0.82 

7.  2 

-0.73 

-0.49 

-0.52 

-1.80 

-1.20 

-1.40 

-1.14 

-0.95 

-0.81 

-0.43 

-0.39 

-0.33 

-0.79 

8.  2 

-0.73 

-0.62 

-1.00 

-1.63 

-1.98 

-1.99 

-1.88 

-1.71 

-1.45 

-0.76 

-0.57 

-0.40 

-1.23 

8.  1 

-0.58 

-0.57 

-0.95 

-1.55 

-1.81 

-1.91 

-1.72 

-1.56 

-1.39 

-0.69 

-0.54 

-0.38 

-1.14 

7.  1 

-0.58 

-0.43 

-0.46 

-1.00 

-1.04 

-1.31 

-0.97 

-0.80 

-0.75 

-0.36 

-0.36 

-0.31 

-0.70 

9.12.3.9 

-0.64 

-0.72 

-1.46 

-1.60 

-2.02 

-1.88 

-2.02 

-1.94 

-1.74 

-1.06 

-0.87 

-0.61 

-1.38 

7.  2.2(9) 

-0.21 

-0.04 

-0.12 

0.04 

-0.28 

-0.30 

-0.29 

-0.08 

-0.02 

-0.10 

-0.20 

-0.17 

-0.15 

Dail.ext. 

-0.55 

-0.46 

0.26 

-0.28 

0.33 

0.15 

0.25 

0.06 

-0.14 

-0.21 

-0.35 

-0.33 

-0.18 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

43 


SIBERIA.  —  BARNAUL. 


XXXIII. 
Lat.  53°  20'  N. 


Long.  83°  27'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour,  j 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Mian. 

0.99 

1.98 

2.43 

2.65 

3.70 

3.75 

3.48 

3.10 

2.80 

1.99 

1.06 

0.77 

2.39 

1 

.15 

2.21 

2.77 

3.03 

4.11 

4.30 

4.07 

3.50 

3.20 

2.24 

.22 

0.86 

2.72 

2 

.26 

2.36 

3.13 

3.24 

4.47 

4.83 

4.49 

3.90 

3.63 

2.50 

.39 

0.95 

3.00 

3 

.41 

2.47 

3.34 

3.49 

4.72 

4.95 

4.77 

4.29 

3.92 

2.69 

.46 

1.01 

3.21 

4 

.56 

2.56 

3.61 

3.59 

4.20 

4.41 

4.40 

4.23 

4.11 

2.89 

.51 

1.07 

3.18 

5 

.55 

2.68 

3.70 

2.78 

2.85 

3.12 

3.34 

3.60 

3.90 

2.91 

.57 

1.10 

2.76 

6 

.61 

2.69 

2.90 

1.58 

1.44 

1.75 

1.88 

2.29 

3.06 

2.68 

1.59 

1.09 

2.05 

7 

.53 

2.30 

1.63 

0.46 

0.28 

0.49 

0.50 

0.85 

1.54 

1.84 

1.50 

1.18 

1.17 

8 

0.94 

1.15 

0.13 

-0.69 

-0.80 

-0.65 

-0.54 

-0.51 

-0.08 

0.87 

0.95 

0.93 

0.14 

9 

0.27 

-0.47 

-1.35 

-1.80 

-1.94 

-1.78 

-1.81 

-1.79 

-1.62 

-0.73 

-0.03 

0.11 

-1.08 

10 

-0.79 

-1.90 

-2.36 

-2.68 

-2.71 

-2.75 

-2.70 

-2.80 

-2.84 

-1.96 

-1.12 

-0.83 

-2.12 

11 

-1.69 

-2.95 

-3.31 

-3.27 

-3.39 

-3.39 

-3.44 

-3.41 

-3.75 

-2.81 

-1.93 

-1.62 

-2.91 

Noon. 

-2.35 

-3.89 

-3.78 

-3.66 

-3.73 

-3.98 

-3.90 

-3.81 

-4.19 

-3.48 

-2.42 

-2.04 

-3.44 

1 

-2.61 

-4.25 

-4.11 

-3.68 

-4.04 

-4.19 

-4.09 

-4.11 

-4.41 

-3.72 

-2.57 

-2.12 

-3.66 

2 

-2.39 

-4.23 

-4.07 

-3.65 

-4.13 

-4.34 

-4.21 

-4.10 

-4.34 

-3.64 

-2.39 

-1.70 

-3.60 

3 

-1.88 

-3.62 

-3.69 

-3.39 

-4.09 

-4.19 

-3.89 

-3.91 

-4.11 

-3.17 

-1.66 

-1.09 

-3.22 

4 

-1.19 

-2.30 

-2.67 

-2.62 

-3.51 

-3.57 

-3.65 

-3.68 

-3.21 

-2.53 

-1.05 

-0.76 

-2.56 

5 

-0.81 

-1.30 

-1.69 

-1.82 

-3.09 

-3.04 

-3.07 

-2.78 

-2.29 

-1.49 

-0.71 

-0.53 

-1.89 

6 

-0.41 

-0.56 

-0.84 

-0.62 

-1.92 

-2.19 

-2.09 

-1.54 

-1.05 

-0.72 

-0.33 

-0.28 

-1.05 

7 

-0.20 

0.09 

0.35 

0.27 

-0.46 

-0.84 

-0.69 

-0.20 

-0.17 

-0.08 

-0.03 

-0.02 

-0.17 

8 

0.12 

0.69 

0.39 

0.99 

0.77 

0.51 

0.52 

0.67 

0.60 

0.31 

0.23 

0.19 

0.50 

9 

0.32 

1.08 

0.88 

1.50 

1.64 

1.48 

1.42 

1.46 

1.26 

0.82 

0.42 

0.39 

1.06 

10 

0.73 

1.47 

1.46 

2.02 

2.42 

2.31 

2.22 

2.04 

1.85 

1.29 

0.58 

0.58 

1.58 

11 

0.78 

1.76 

1.92 

2.35 

3.11 

3.05 

2.88 

2.58 

2.36 

1.68 

0.83 

0.75 

2.00 

Mean. 

-14.71 

-13.47 

-5.47 

1.77 

7.78 

13.62 

14.98 

12.76 

7.53 

1.58 

-8.36 

-13.07 

4.94 

The  numbers  without  sign  must  be  added ;  those  with  the  sign  — must  be  subtracted. 


E 


44 


HOURLY    CORRECTIONS 


FOR 


PERIODIC    VARIATIONS 


EUROPE. 


45 


XXXIV. 

ITALY.  —  ROME.     Lat.  41°  54'  N.     Long.  12°  25'  E.  Greenw. 
Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 


Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year. 

Degrees  of  Reaumur. 


DOVE. 


Hours. 

Jan. 

Feb. 

March 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

NOT. 

Dec. 

Mean. 

Morn.  1 

0.90 

1.08 

1.22 

1.55 

1.88 

2.44 

2.17 

2.20 

1.63 

1.50 

1.15 

0.93 

1.55 

2 

0.99 

1.26 

1.50 

1.84 

2.10 

2.59 

2.41 

2.49 

1.91 

1.75 

1.29 

1.02 

1  76 

3 

.14 

1.58 

1.96 

2.31 

2.56 

3.02 

2.99 

3.00 

2.38 

2.12 

1.53 

1.19 

2.15 

4 

.36 

1.99 

2.46 

2.80 

3.06 

3.51 

3.68 

3.54 

2.91 

2.58 

1.87 

1.43 

2.60 

5 

.60 

2.36 

2.80 

3.07 

3.30 

3.71 

4.06 

3.79 

3.25 

2.96 

2.22 

1.70 

2.90 

6 

.77 

2.52 

2.76 

2.92 

3.04 

3.36 

3.81 

3.53 

3.17 

3.10 

2.42 

1.87 

2.86 

7 

.74 

2.33 

2.24 

2.25 

2.19 

2.38 

2.82 

2.62 

2.58 

2.82 

2.33 

1.83 

2.34 

8 

1.40 

1.73 

1.29 

1.15 

0.93 

0.98 

1.27 

1.22 

1.51 

2.05 

1.82 

1.47 

1.40 

9 

0.72 

0.78 

0.10 

-0.15 

-0.47 

-0.51 

-0.44 

-0.35 

0.15 

0.86 

0.93 

0.78 

020 

10 

-0.24 

-0.38 

-1.08 

-1.39 

-1.68 

-1.75 

-1.89 

-1.78 

-1.23 

-0.58 

-0.22 

-0.15 

-1.03 

11 

-1.27 

-1,54 

-2.06 

-2.36 

-2-53 

-2.59 

-2.87 

-2.84 

-2.41 

-2.00 

-1.41 

-1.14 

-2.09 

Noon.  .  . 

-2.15 

-2.49 

-2.71 

-2.98 

-3.01 

-3.08 

-3.38 

-3.49 

-3.24 

-3.14 

-2.39 

-1.99 

-2.84 

1 

-2.69 

-3.07 

-3.02 

-3.27 

-3.23 

-3.40 

-3.61 

-3.81 

-3.70 

-3.82 

-3.00 

-2.52 

-3.26 

2 

-2.78 

-3.25 

-3.04 

-3.28 

-3.31 

-3.70 

-3.76 

-3.92 

-3.80 

-3.99 

-3.16 

-2.66 

-3.39 

3 

-2.44 

-3.03 

-2.84 

-3.10 

-3.31 

-3.97 

-3.89 

-3.87 

-3.59 

-3.69 

-2.93 

-2.44 

-3.26 

4 

-1.83 

-2.51 

-2.45 

-2.72 

-3.14 

-4.05 

-3.88 

-3.62 

-3.11 

-3.04 

-2.41 

-1.95 

-2.89 

5 

-1.11 

-1.81 

-1.89 

-2.15 

-2.70 

-3.70 

-3.53 

-3.05 

-2.38 

-2.21 

-1.76 

-1.35 

-2.30 

6 

-0.45 

-1.05 

-1.20 

-1.39 

-1.91 

-2.79 

-2.67 

-2.18 

-1.48 

-1.32 

-1.09 

-0.75 

-1.52 

7 

0.05 

-0.34 

-0.44 

-0.53 

-0.84 

-1.42 

-1.38 

-1.01 

-0.51 

-0.50 

-0.48 

-0.24 

-0.64 

8 

0.39 

0.25 

0.26 

0.30 

0.29 

0.13 

0.081 

0.21 

0.38 

0.19 

1  0.05 

0.17 

0.23 

9 

0.59 

0.67 

0.78 

0.94 

1.22 

1.46 

1.33 

1.22 

1.05 

0.71 

0.46 

0.46 

0.91 

10 

0-71 

0.90 

1.07 

1.31 

1.76 

2.29 

2.10 

1.86 

1.43 

1.05 

0.76 

0.66 

1.33 

11 

0.78 

0.99 

1.15 

1.44 

1.93 

2.57 

2.33 

2.11 

1.54 

1.24 

0.95 

0.79 

1.49 

Midn.  .  . 

0.84 

1.02 

1.15 

1.46 

1.88 

2.51 

2.24 

2.14 

1.55 

1.36 

1.06 

0.86 

1.51 

6.  6 

0.66 

0.74 

0.78 

0.76 

0.57 

0.28 

0.57 

0.68 

0.85 

0.89 

0.67 

0.56 

0.67 

7.  7 

0.90 

1.00 

0.90 

0.86 

0.68 

0.48 

0.72 

0.80 

1.03 

1.16 

0.92 

0.80 

0.85 

8.  8 

0.89 

0.99 

0.77 

0.72 

0.61 

0.55 

0.67 

0.71 

0-95 

1.12 

0.94 

0.82 

0.81 

9.  9 

0.65 

0.72 

0.44 

0.40 

0.37 

0.48 

0.45 

0.43 

0.60 

0.78 

0.70 

0.62 

0.55 

10.10 

0.24 

0.26 

-0.01 

-0.04 

0.04 

0.27 

0.10 

0.04 

0.10 

0.23 

0.27 

0.26 

0.15 

7.  2.  9 

-0.15 

-0.08 

-0.01 

-0.03 

0.03 

0.05 

0.13 

-0.03 

-0.06 

-0.15 

-0.12 

-0.12 

-0.05 

6.  2.  8 

-0.21 

-0.16 

-0.01 

-0.02 

0.01 

-0.07 

0.04 

-0.06 

-0.08 

-0.23 

-0.23 

-0.21 

-0.10 

6.  2.10 

-0.10 

0.06 

0.26 

0.32 

0.50 

0.65 

0.72 

0.49 

0.27 

0.05 

0.01 

-0.04 

0.27 

6.  2.  6 

-0.49 

-0.59 

-0.49 

-0.58 

-0.73 

-1.04 

-0.87 

-0.86 

-0.70 

-0.74 

-0.61 

-0.51 

-0.68 

7.  2 

-0.52 

-0.46 

-0.40 

-0.52 

-0.56 

-0.66 

-0.47 

-0.65 

-0.61 

-0.59 

-0.42 

-0.42 

-0.52 

8.  2 

-0.69 

-0.76 

-0.88 

-1.07 

-1.19 

-1.36 

-1.25 

-1.35 

-1.15 

-0.97 

-0.67 

-0.60 

-1.00 

8.  1 

-0.65 

-0.67 

-0.87 

-1.06 

-1.15 

-1.21 

-1.17 

-1.30 

-1.10 

-0.89 

-0.59 

-0.53 

-0.93 

7.   1 

-0.48 

-0.37 

-0.39 

-0.51 

-0.52 

-0.51 

-0.40 

-0.60 

-0.56 

-0.50 

-0.34 

-0.35 

-0.46 

9.12.3.9 

-0.82 

-1.02 

-1.17 

-1.32 

-1.39 

-1.53 

-1.60 

-1.62 

-1.41 

-1.32 

-0.98 

-0.80 

-1.25 

7.  2.2(9) 

0.04 

0.11 

0.19 

0.21 

0.33 

0.40 

0.43 

0.29 

0.22 

0.06 

0.02 

0.02 

0.19 

Dail.ext. 

-0.51 

-0.37 

-0.12 

-0.11 

-0.01 

-0.17 

0.09 

-0.07 

-0.28 

-0.45 

-0.37 

-0.40 

-0.25 

The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

47 


XXXV. 

ITALY.  —  PADUA.     Lat.  45°  24'  N.     Long.  11°  52'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


i 

Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0-58 

0.57 

0.89 

1.23 

2.43 

2.21 

2.86 

2.27 

1.59 

0.86 

.04 

0.83 

1.45 

2 

0.58 

081 

1.20 

1.49 

2.70 

2.40 

3.20 

2.70 

1.85 

1.03 

.16 

0.96 

1.67 

3 

0.76 

0.97 

1.42 

166 

3.00 

2.68 

3.53 

3.05 

2.10 

1.20 

.26 

0.98 

1.88 

4 

0.79 

1.13 

1.68 

1.97 

3.14 

2.71 

3.78 

3.44 

2.34 

1.39 

.35 

1.05 

2.06 

5 

1.06 

1.31 

189 

2.26 

2.97 

2.39 

3.34 

3.44 

2.66 

1.5S 

.42 

1.12 

2.12 

6 

1.13 

1.46 

2.06 

2.22 

1.96 

1.22 

2.07 

2.93 

2.54 

1  54 

.49 

1.16 

1.82 

7 

1.25 

1.58 

1.86 

1.82 

0.66 

0.08 

0.56 

1.82 

1.78 

1.37 

.58 

1.23 

1.30 

8 

1.07 

1.42 

0.66 

1.03 

-0.23 

-0.65 

-0.25 

0.58 

0.79 

0.81 

0.97 

1.00 

0.60 

9 

0.70 

0.82 

0.61 

0.18 

-1.07 

-1.24 

-1.63 

-1.65 

-0.58 

0.18 

0.02 

0.33 

-0.28 

10 

0.10 

-0.08 

-0.83 

-0.42 

-1.70 

-1.66 

-2.29 

-1.90 

-1.03 

-0.51 

-0.81 

-0.26 

-0.95 

11 

-0.58 

-0.62 

-0.87 

-0.85 

-2.30 

-2.23 

-2.77 

-2.38 

-1.56 

-0.99 

-1.51 

-1.05 

-1.48 

Noon.  .  . 

-0.98 

-1.24 

-1.32 

-1.27 

-2.74 

-2.52 

-3.16 

-2.97 

-2.14 

-1.41 

-2.02 

-1.50 

-1.94 

1 

-1.38 

-1.45 

-1.54 

-1.68 

-2.88 

-2.61 

-3.53 

-3.34 

-2.54 

-1.74 

-2.42 

-1.90 

-2.25 

2 

-1.51 

-1.62 

-1.74 

-1.92 

-2.94 

-2.62 

-3.74 

-3.73 

-2.84 

-2.01 

-2.55 

-2.06 

-2.44 

3 

-1.45 

-1.65 

-1.90 

-2.14 

-2.94 

-2.59 

-3.54 

-3.81 

-2.87 

-2.04 

-2.22 

-1.68 

-2.40 

4 

-1.18 

-1.34 

-1.71 

-2.10 

-2.67 

-2.20 

-2.82 

-3.23 

-2.38 

-1.94 

-1.53 

-1.14 

-2.02 

5 

-0.87 

-0.98 

-1.39 

-1.98 

-2.08 

-1.60 

-2.44 

-2.49 

-1.60 

-1.05 

-0.73 

-0.74 

-1.50 

6 

-0.59 

-0.79 

-1.02 

-1.51 

-1.20 

-1.00 

-1.41 

-1.34 

-0.83 

-0.54 

-0.15 

-0.33 

-0.89 

7 

-0.32 

-0.62 

-0.73 

-1.12 

-0.26 

-0.12 

-0.46 

-0.32 

-0.18 

-0.14 

0.12 

-0.15 

-0.36 

8 

-0.07 

-0.42 

-0.43 

-0.47 

-0.14 

0.38 

1.01 

0.50 

-0.10 

0.05 

0.33 

0.04 

0.06 

9 

0.05 

-0.14 

-0.10 

-0.11 

1.11 

1.38 

1.54 

1.01 

0.23 

0.26 

0.49 

0.26 

0.50 

10 

0.18 

0.09 

0.24 

0.27 

1.44 

1.72 

1.67 

1.36 

0.58 

0.52 

0.72 

0.46 

'0.77 

11 

0.29 

0.31 

0.48 

0.60 

1.75 

1.86 

2.14 

1.78 

0.84 

0.68 

0.86 

0.59 

1.02 

Midn.  .  . 

0.37 

0.49 

0.72 

0.85 

2.02 

2.10 

2.43 

2.23 

1.36 

0.78 

0.94 

0.70 

1.25 

6.  6 

0.27 

0.34 

0.52 

0.36 

0.38 

0.11 

0.33 

0.80 

0.86 

0.50 

0.67 

0.42 

0.46 

7.  7 

0.47 

0.48 

0.57 

0.35 

0.20 

-0.02 

0.05 

0.75 

0.80 

0.62 

0.85 

0.54 

0.47 

8.  8 

0.50 

0.50 

0.12 

0.28 

-0.19 

-0.14 

0.38 

0.54 

0.35 

0.43 

0.65 

0.52 

0.33 

9.  9 

038 

0.34 

0.26 

0.04 

0.02 

0.07 

-0.05 

-0.32 

-0.18 

0.22 

0.26 

0.30 

0.11 

10.10 

0.14 

0.01 

-0.30 

-0.08 

-0.13 

0.03 

-0.31 

-0.27 

-0.23 

0.01 

-0.05 

0.10 

-0.09 

7.  2.  9 

-0.07 

-0.06 

0.01 

-0.07 

-0.39 

-0.39 

-0.55 

-0.30 

-0.28 

-0.13 

-0.16 

-0.19 

-0.21 

6.  2.  8 

-0.15 

-0.19 

-0.04 

-0.06 

-0.37 

-0.34 

-0.22 

-0.10 

-0.13 

-0.14 

-0.24 

-0.29 

-0.19 

6.  2.10 

-0.07 

-0.02 

0.19 

0.19 

0.15 

0.11 

-0.00 

0.19 

0.09 

0.02 

-0.11 

-0.15 

0.05 

6.  2.  6 

-0.32 

-0.32 

-0.23 

-0.40 

-0.73 

-0.80 

-1.03 

-0.71 

-0.38 

-0.34 

-0.40 

-0.41 

-0.51 

7.  2 

-0.13 

-0.02 

0.06 

-0.05 

-1.14 

-1.27 

-1.59 

-096 

-0.53 

-0.32 

-0.49 

-0.42 

-0.57 

8.  2 

-0.22 

-0.10 

-0.54 

-0.45 

-1.59 

-1.64 

-2.00 

-1.58 

-1.03 

-0.60 

-0.79 

-0.53 

-0.92 

8.  1 

-0.16 

-0.02 

-0.44 

-0.33 

-1.56 

-1.63 

-1.89 

-1.38 

-0.88 

-0.47 

-0.73 

-0.45 

-0.83 

7.  1 

-007 

0.07 

0.16 

0.07 

-1.11 

-1.27 

-1.49 

-0.76 

-0.38 

-0.19 

-0.42 

-0.34 

-0.48 

9.12.3.9 

-0.42 

-0.55 

-0.68 

-0.84 

-1.41 

-1.24 

-1.70 

-1.86 

-134 

-0.75 

-0.93 

-0.65 

-1.03 

7.  2.2(9) 

-0.04 

-0.08 

-0.02 

-0.08 

-0.02 

0.06 

-0.03 

O.C3 

-0.15 

-0.03 

-0.00 

-O.OS 

-0.04 

Dail.ext. 

-0.13 

-0.04 

0.08 

0.06 

0.10 

0.05 

0.02 

-0.19 

-0.11 

-0.23 

-0.49 

-0.42 

-0.16 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  — must  be  subtracted. 

48 


SWITZERLAND.  —  GENEVA. 


XXXVI. 

Lot.  46°  12'  N. 


Long.  6°  9'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour.  !     Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn.        0.50 

0.68 

1.38 

1.68 

2.16 

2.77 

2.54 

2.38 

1.86 

1.44 

0.80 

0.48 

1.56 

1           0.62 

0.83 

1.88 

2.14 

2.72 

3.32 

3.19 

3.08 

2.41 

1.71 

0.97 

0.54 

1.95 

2           0.74 

1.01 

2.34 

2.53 

3.16 

3.68 

3.70 

3.68 

2.93 

1.95 

1.14 

0.61 

2.29 

3          0.83 

1.22 

2.70 

2.76 

3.40 

3.74 

3.89 

4.03 

3.34 

2.14 

1.30 

0.70 

2.50 

4          0.92 

1.46 

2.89 

2.78 

3.34 

3.50 

3.80 

4.00 

3.49 

2.22 

1.43 

0.81 

2.55 

5          0.98 

1.66 

2.83 

2.54 

2.93 

2.88 

3.26 

3.52 

3.30 

2.14 

1.51 

0.91 

2.37 

6 

1.02 

1.75 

2.49 

2.03 

2.22 

2.03 

2.39 

2.65 

2.72 

1.85 

1.48 

0.97 

1.97 

7 

0.97 

1.66 

1.90 

1.33 

1.28 

1.05 

1.38 

1.54 

1.84 

1.34 

1.26 

0.92 

1.37 

8           0.7S 

1.33 

1.09 

050 

0.27 

0.08 

0.26 

0.37 

0.78 

0.65 

0.84 

0.70 

0.64 

9          0.46 

0.74 

0.17 

-0.34 

-0.69' 

-0.82 

-0.71 

-0.70 

-0.30 

-0.15 

0.23 

0.34    -0.16 

10       -0.02 

-0.01 

-0.77 

-1.10 

-1.51 

-1.57 

-1.53 

-1.58 

-1.26 

-0.98 

-0.47 

-0.1  <>   -0.91 

11        -0.57 

-0.80 

-1.61 

-1.75 

-2.17 

-2.18 

-2.24 

-2.29 

-2.06 

-1.70 

-1.14 

-0.67 

-1.60 

Noon.     -   .00 

-1.49 

-2.26 

-2.23 

-2.66 

-2.70 

-2.74 

-2.85 

-2.66 

-2.22 

-1.66 

-1.10 

-2.14 

1        -  .40 

-1.98 

-2.70 

-2.55 

-2.98 

-3.10 

-3.18 

-3.29 

-3.08 

-2.53 

-1.94 

-1.37 

-2.51 

2       -  .50 

-2.18 

-2.87 

-2.67 

-3.12 

-3.35 

-3.48 

-3.58 

-3.29 

-2.58 

-1.94 

-1.41 

-2.66 

3       -  .41 

-2.10 

-2.81 

-2.61 

-3.07 

-3.42 

-3.51 

-3.65 

-3.28 

-2.41 

-1.74 

-1.26 

-2.61 

4       -  .14 

-1.82 

-2.54 

-2.37 

-2.80 

-3.25 

-3.37 

-3.43 

-3.04 

-2.06 

-1.38 

-0.97 

-2.35 

5       -0.79 

-1.37 

-2.10 

-1.97 

-2.32 

-2.78 

-2.90 

-2.92 

-2.57 

-1.59 

-0.99 

-0.64 

-1.91 

6       -0.46 

-0.94 

-1.59 

-1.46 

-1.70 

-2.11 

—2.22 

-2.18 

-1.91 

-1.06 

-0.62 

-0.32 

-1.38 

7       -0.20 

-0.51 

-1.06 

-0.90 

-1.00 

-1.29  -1.40 

-1.31 

-1.16  -0.53  -0.30 

-0.07 

-0.81 

8       -0.01 

-0.14 

-0.54 

-0.34 

-0.29 

-0.42 

-0.49 

-0.46 

-0.42  -0.02 

-0.03 

0.11 

-0.26 

9          0:12 

0.14 

0.05 

0.20 

0.38 

0.47 

0.34 

0.32 

0.26 

0.42 

0.20 

0.24 

0.26 

10          0.25 

0.37 

0.42 

0.70 

0.91 

1.30 

1.10 

1.02 

0.83 

0.82 

0.42 

0.34 

0.71 

11 

0.37 

0.54 

0.90 

1.20 

1.51 

2.07 

1.87 

1.70 

1.35 

1.15 

0.62 

0.41 

1.14 

'Mean    -0.53 

1.24 

3.41 

6.77 

10.37 

13.31 

14.30    13.58 

11.46 

7.48 

3.76 

0.58 

XXXVII. 

SWITZERLAND.  —  GENEVA.     Lat.  46°  12'  N.     Long.  6°  9'  E.  Gr.—  DOVE. 

Degrees  of  Reaumur. 

Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct.        Nov. 

Dec. 

Year. 

Midn. 

0.45 

0.69 

1.26 

1.44 

1.54 

1.98 

2.12 

1.63 

1.44 

0.94 

0.50 

0.59 

1.21 

2 

0.70 

0.96 

2.21 

2.62 

2.60 

3.20 

3.18 

2.83 

2.72 

1.46 

0.73 

0.66 

1.99 

4 

1.01 

1.33 

2.91 

3.36 

3.11 

3.55 

3.82 

3.51 

3.26 

1.90 

1.02 

0.80 

2.46 

6 

1.19 

1.49 

2.70 

2.87 

2.26 

2.38 

2.47 

2.82 

2.79 

1.74 

1.13 

0.97 

2.07 

8 

1.22 

1.22 

1.42 

0.74 

0.27 

0.13 

0.22 

0.49 

0.72 

0.94      0.90 

0.95 

0.77 

10 

-0.02 

-0.25 

-0.68 

-1.70 

-1.30 

-1.34 

-1.25 

-1.01 

-1.10 

-0.73  -0.26 

-0.14 

-0.73 

Noon. 

-0.13 

-1.30 

-1.97  -2.14 

-2.42 

-2.54 

-2.50 

-2.34  -2.38 

-1.86-1.18 

-1.22 

-1.91 

o 

-1.69 

-1.70  -2.  82  -2.94-2.97 

-3.09 

-3.11 

-3.17-3.03 

-2.35  -1.55 

-1.46 

-2.49 

4 

-1.30 

-1.61  -2.70  -2.94  -2.46 

-2.87 

-2.89  -3.04  -2.S6 

-1.53 

-1.19 

-1.05 

-2.20 

6 

-0.54 

-0.90  -1.79  -2.03  -1.40 

-1.89 

-2.24  -2.04  -1.74 

-0.88 

-0.45 

-0.43 

-1.36 

S 

-0.09  -0.21  -0.89  -0.70  -0.10 

-0.25 

-0.58 

-0.38  -0.38 

-0.08 

0.03 

0.10 

-0.29 

10 

0.20 

0.2S 

0.34 

0.40     0.86 

0.78 

0.78 

0.69 

0.57 

0.47 

0.29 

0.18 

0.49 

Mean. 

1.20 

0.47 

2.2S 

6.81 

9.48     12.82 

14.43    13.74 

10.66 

7.73 

3.30 

0.12 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

49 


XXXVIII. 

SWITZERLAND.  —  ST.  BERNARD.     Lat.  45°  52'  N.     Long.  9°  22'  E.  Gr. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn. 

0.48 

0.81 

1.34 

1.96 

2.10 

1.72 

1.62 

1.30 

0.76 

.02 

0.59 

0.31 

1.17 

1 

0.63 

0.91 

1.58 

2.22 

2.45 

1.99 

1.93 

1.53 

0.97 

.17 

0.66 

0.33 

1.36 

2 

0.81 

1.09 

1.82 

2.40 

2.73 

2.15 

2.14 

1.82 

1.17 

.30 

0.78 

0.40 

1.55 

3 

0.99 

1.26 

1.98 

2.46 

2.81 

2.24 

2.24 

1.94 

1.34 

.36 

0.89 

0.50 

1.67 

4 

l.OS 

1.38 

2.02 

2.34 

2.67 

2.14 

2.17 

1.91 

1.41 

.34 

0.98 

0.52 

1.66 

5 

1.08 

1.34 

1.84 

2.00 

2.28 

1.88 

1.90 

1.70 

1.35 

1.19 

0.98 

0.66 

1.52 

6 

0.91 

1.14 

1.42 

1.45 

1.72 

1.42 

1.44 

1.34 

1.14 

0.92 

0.86 

0.62 

1.20  ; 

7 

0.60 

0.74 

0.79 

0.70 

0.81 

0.81 

0.82 

0.76 

0.77 

0.83 

0.61 

0.50 

0.73 

8 

0.17 

0.18 

0.00 

-0.16 

-0.08 

0.09 

0.10 

0.12 

0.29 

0.06 

0.26 

0.26 

0.11 

9 

-0.31 

-0.48 

-0.85 

-1.06 

-1.10 

-0.66 

-0.66 

-0-53 

-0.26 

-0.46 

-0.22 

-0.06 

-0.55 

10 

-0.78 

-1.13 

-1.63 

-1.86 

-1.94 

-1.36 

-1.34 

-1.13 

-0.78 

-0.94 

-0.68 

-0.41 

-1.16 

11 

-1.14 

-1.66 

-2.23 

-2.50 

-2.58 

-1.95 

-1.90 

-1.60 

-1.22 

-1.33 

-1.09 

-0.71 

-1.66 

Noon. 

-1.34 

-1.98 

-2.58 

-2.87 

-2.96 

-2.34 

-2.26 

-1.90 

-  .51 

-  .58 

-1.36 

-0.94 

-1.97 

1 

-1.38 

-2.04 

-2.62 

-2.98 

-3.06 

-2.51 

-2.40 

-2.02 

-  .62 

-  .66 

-1.47 

-1.03   -2.07 

2 

-1.24 

-1.86 

-2.38 

-2.78 

-2.89 

-2.44 

-2.33 

-1.94 

-  .56 

-  .59 

-1.39 

-0.99   -1.95 

3 

-0.98 

-1.47 

-1.92 

-2.36 

-2.51 

-2.21 

-2.08 

-1.74 

-  .35 

-  .38 

-1.16 

-0.82 

-1.66 

4 

-0.65 

-0.97 

-1.34 

-1.79 

-1.98 

-1.80 

-1.70 

-1.42 

-  .05 

-  .07 

-0.83 

-0.57 

-1.26 

5 

-0.32 

-0.43 

-0.73 

-1.17 

-1.40 

-1.32 

-1.26 

-1.06 

-0.70 

-0.72 

-0.46 

-0.27 

-0.82 

6 

-0.05 

0.04 

-0.19 

-0.54 

-0.81 

-0.80 

-0.80 

-0.70 

-0.38 

-0.36 

-0.10 

0.00 

-0.39 

7 

0.14 

0.39 

0.25 

0.04 

-6.25 

-0.28 

-0.34 

-0.34 

-0.11 

-0.03 

0.19 

0.21 

-0.01 

8 

0.25 

0.60 

0.56 

0.54 

0.27 

0.20 

0.09 

0.00 

0.10 

0.24 

0.38 

0.34 

0.30 

9 

0.30 

0.69 

0.78 

0.96 

0.76 

0.63 

0.50 

0.32 

0.27 

0.47 

0.49 

0.38 

0.55 

10 

0.34 

0.72 

0.96 

1.33 

1.22 

1.02 

0.89 

0.64 

0.42 

0.67 

0.53 

0.38 

0.76 

11 

0.38 

0.74 

1.14 

1.66 

1.68 

1.40 

1.26 

0.97 

0.58 

0.85 

0.55 

0.33 

0.96 

... 

Mean.  ; 

-8.26 

-6.62 

-5.72 

-2.97 

0.74 

3.55 

4.82 

4.32 

2.40 

-0.91 

-3.95  -5.86  j 

XXXIX. 

SWITZERLAND.  —  ST.  BERNARD.    Lat.  45°  52'  N.    Long.  9°  22'  E.  Gr.  —  DOVE. 

Degrees  of  Reaumur. 

Hour. 

Jan. 

Feb. 

March. 

April. 

May.  1  June. 

July. 

Aug. 

Sept. 

Got. 

Nov. 

Dec. 

Year. 

Midn. 

0.34 

0.55 

0.75 

1.19 

1.26 

1.39 

1.02 

1.08 

0.81 

0.66, 

0.33 

0.28 

0.80 

2 

0.52 

0.78 

1.14 

1.64 

1.75 

1.88 

1.62 

1.53 

1.16 

0.94 

0.42 

0.27 

1.14 

4 

0.82 

1.06 

1.50 

1.84 

1.91 

1.98 

1.82 

1.71 

1.34 

1.17 

0.65 

0.42 

1.35 

6 

0.65 

0.86 

1.20 

1.50 

1.53 

1.46 

1.46 

1.27 

0.98 

0.88 

0.50 

0.32 

1.05 

'    8 

0.48 

0.26 

0.14 

-O.OS 

-0.25 

0.01 

0.22 

0.16 

0.08 

0.28 

0.27 

0.15 

0.14 

10 

-0.35 

-0.91 

-1.06 

-1.26 

-1.39 

-1.18 

-1.11 

-0.94 

-0.86 

-0.68 

-0.54 

-0.23 

-0.88 

Noon. 

-1.40 

-1.66 

-1.74 

-2.11 

-2.15 

-1.92 

-1.81 

-1.77 

-1.58 

-1.45 

-1.26 

-0.91 

-1.65 

2 

-1.37 

-1.55 

-1.89 

-2.12 

-2.12 

-2.23 

-2.01 

-1.97 

-1.54 

-1.52 

-1.23 

-1.22 

-1.73 

4 

-0.42  -0.71 

-1.14 

-1.55 

-1.47 

-1.65 

-1.49 

-1.30 

-0.88 

-0.86 

-0.37 

-0.02 

-0.99 

6 

0.09 

0.17 

0.09 

-0.26 

-0.35 

-0.71 

-0.57 

-0.46 

-0.26 

-0.07 

0.08 

0.22 

-0.17 

8 

0.25 

0.44 

0.49 

0.49 

0.50 

0.35 

0.30 

0.26 

0.26 

0.22 

0.70 

0.30 

0.38 

10 

0.37 

0.55 

0.55 

0.71 

0.76 

0.64 

0.56 

0.43 

0.46 

0.43 

0.40 

0.40 

0.52 

Mean. 

-6.08  -8.83 

-6.66 

-3.01 

-0.42 

2.71 

4.82 

4.70 

2.07 

-0.36 

-5.46 

-6.18 

I 

E 


The  numbers  without  sign  must  be  added  ;  those  -with  the  sign  —  must  be  subtracted. 

50 


XL. 

AUSTRIA.  —  KREMSMUNSTER.     Lat.  48°  3'  N.     Long.  14°  7'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.58 

0.90 

1.05 

1.14 

2.30 

2.77 

1.86 

1.94 

1.52 

1.26 

0.61 

0.40 

1.36 

2 

0.66 

1.03 

1.30 

1.36 

2.66 

3.08 

2.16 

2.26 

1.94 

1.58 

0.72 

0.42 

1.60 

3 

0.71 

1.07 

1.57 

1.63 

2.84 

3.14 

2.35 

2.50 

2.32 

1.82 

0.78 

0.42 

1.76 

4 

0.78 

1.12 

1.80 

1.88 

2.78 

2.90 

2.34 

2.54 

2.58 

1.97 

0.83 

0.42 

1.83 

5 

0.84 

1.19 

1.90 

1.99 

2.44 

2.32 

2.08 

2.30 

2.60 

1.98 

0.88 

0.46 

1.75 

6 

0.88 

1.24 

1.82 

1.88 

1.86 

1.54 

1.54 

1.80 

2.34 

1.91 

0.93 

0.54 

1.52 

7 

0.84 

1.26 

1.50 

1.41 

1.11 

0.68 

0.94 

1.11 

1.81 

1.63 

0.92 

0.59 

1.15 

8 

0.67 

1.07 

0.96 

0.87 

0.31 

-0.15 

0.23 

0.35 

1.09 

1.21 

0.80 

0.56 

0.66 

9 

0.35 

0.67 

0.30 

0.14 

-0.45 

-0.86 

-0.42 

-0.37 

0.28 

0.62 

0.51 

0.38 

0.10 

10 

-0.10 

0.01 

-0.41 

-0.58 

-1.10 

-1.42 

-0.95 

-0.98 

-0.52 

-0.13 

0.06 

0.05 

-0.56 

11 

-0.58 

-0.72 

-1.06 

-1.20 

-1.65 

-1.84 

-1.39 

-1.47 

-1.23 

-0.92 

-0.47 

-0.38 

-1.08 

Noon.  .  . 

-0.98 

-1.37 

-1.56 

-1.65 

-2.09 

-2.17 

-1.75 

-1.86 

-1.81 

-1.68 

-0.97 

-0.78 

-1.56 

1 

-1.22 

-1.78 

-1.89 

-1.93 

-2.42 

-2.42 

-2.05 

-2.21 

-2.28 

—2.25 

-1.30 

-1.03 

-1.90 

2 

-1.26 

-1.90 

-2.02 

-2.06 

-2.62 

-2.58 

-2.26 

-2.38 

-2.56 

-2.53 

-1.40 

-1.09 

-2.05 

3 

-1.12 

-1.69 

-1.99 

-2.04 

-2.67 

-2.62 

-2.33 

-2.46 

-2.65 

-2.49 

-1.28 

-0.94 

-2.02 

4 

-0.86 

-1.32 

-1.79 

-1.89 

-2.51 

-2.49 

-2.22 

-2.34 

-2.52 

-2.17 

-1.01 

-0.66 

-1.98 

5 

-0.59 

-0.92 

-1.48 

-1.60 

-2.15 

-2.16 

-1.88 

-2.00 

-2.18 

-1.69 

-0.68 

-0.35 

-1.47 

6 

-0.35 

-0.57 

-1.08 

-1.18 

-1.62 

-1.66 

-1.38 

-1.49 

-1.66 

-1.14 

-0.41 

-0.11 

-1.05 

7 

-0.18 

-0.36 

-0.65 

-0.68 

-0.98 

-1.03 

-0.76 

-0.86 

-1.05 

-0.66 

-0.22 

0.02 

-0.62 

8 

-0.04 

-0.19 

-0.23 

-0.17 

-0.34 

-0.35 

-0.15 

-0.24 

-0.46 

-0.26 

-0.11 

0.09 

-0.20 

9 

0.07 

-0.02 

0.13 

0.28 

0.28 

0.34 

0.38 

0.30 

0.05 

0.06 

-0.02 

0.12 

0.16 

10 

0.20 

0.18 

0.42 

0.61 

0.84 

1.02 

0.82 

0.76 

0.46 

0.34 

0.11 

0.18 

0.49 

11 

0.34 

0.46 

0.63 

0.82 

1.36 

1.68 

1.19 

1.15 

0.80 

0.63 

0.27 

0.25 

0.80 

MIdn.  .  . 

0.47 

0.70 

0.83 

0.97 

1.85 

2.27 

1.52 

1.53 

1.14 

0.94 

0.46 

0.34 

1.08 

6.  6 

0.27 

0.34 

0.37 

0.35 

0.12 

-0.06 

0.08 

0.16 

0.34 

0.39 

0.26 

0.22 

0.24 

7.  7 

0.33 

0.45 

0.43 

0.37 

0.07 

-0.18 

0.09 

0.13 

0.38 

0.48 

0.35 

0.29 

0.27 

8.  8 

0.32 

0.44 

0.37 

0.35 

-0.02 

-0.10 

0.04 

0.06 

0.32 

0.48 

0.35 

0.24 

0.24 

,    9.  9 

0.21 

0.33 

0.22 

0.21 

-0.09 

-0.26 

-0.02 

-0.04 

0.17 

0.34 

0.25 

0.25 

0.13 

10.10 

0.05 

0.10 

0.01 

0.02 

-0.13 

-0.20 

-0.07 

-0.11 

-0.03 

0.11 

0.09 

0.12 

0.00 

7.  2.  9 

-0.12 

-0.22 

-0.13 

-0.12 

-0.41 

-0.52 

-0.31 

-0.32 

-0.23 

-0.28 

-0.17 

-0.16 

-0.25 

6.  2.  8 

-0.14 

-0.28 

-0.14 

-0.12 

-0.37 

-0.46 

-0.29 

-0.27 

-0.23 

-0.29 

-0.19 

-0.15 

-0.24 

6.  2.10 

-0.06 

-0.16 

0.07 

0.14 

0.03 

-0.01 

0.03 

0.06 

0.08 

-0.09 

-0.12 

-0.12 

-0.01 

6.  2.  6 

-0.24 

-0.41 

-0.43 

-0.45 

-0.79 

-0.90 

-0.70 

-0.69 

-0.63 

-0.94 

-0.36 

-0.15 

-0.56 

7.  2 

-0.21 

-0.32 

-0.26 

-0.33 

-0.76 

-0.95 

-0.66 

-0.63 

-0.38 

-0.45 

-0.24 

-0.25 

-0.45 

8.  2 

-0.30 

-0.42 

-0.53 

-0.60 

-1.16 

-1.22 

-1.02 

-1.02 

-0.74 

-0.66 

-0.30 

-0.27 

-0.69 

8.  1 

-0.28 

-0.36 

-0.47 

-0.53 

-1.06 

-1.14 

-0.91 

-0.93 

-0.60 

-0.52 

-0.25 

-0.24 

-0.61 

7.  1 

-0.19 

-0.26 

-0.20 

-0.26 

-0.66 

-0.87 

-0.56 

-0.55 

-0.24 

-0.31 

-0.19 

-0.22 

-0.38 

9.12.3.9 

-0.42 

-0.60 

-0.78 

-0.82 

-1.23 

-1.33 

-1.03 

-1.10 

-1.03 

-0.87 

-0.44 

-0.31 

-0.83 

7.  2.2(9) 

-0.07 

-0.17 

-0.07 

-0.02 

-0.24 

-0.31 

-0.15 

-0.17 

-0.14 

-0.19 

-0.13 

-0.07 

-0.14 

Dail.  ext. 

-0.19 

-0.32 

-0.06 

-0.04 

0.09 

0.36 

0.01 

0.04 

-0.03 

-0.28 

-0.24 

-0.25 

-0.08 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

51 


XLI. 


AUSTRIA.  —  SALZBURG.    Lat.  47°  48'  N.    Long.  13°  1'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour.       Jan. 

Feb. 

March.'  April. 

May. 

June. 

July. 

Aug.       Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn. 

i 
0.54 

0.70 

1.06 

1.31 

2.03 

2.07 

1.87 

1.57 

1.21 

1.02 

0.48 

0.42 

1.19 

1 

!    0.59 

0.79 

1.29 

1.58 

2.37 

2.27 

2.13 

1.81 

1.45 

1.15 

0.65 

0.50 

1.38 

2 

0,72 

0.97 

0.51 

1.79 

2.64 

2.56 

2.36 

2.05 

1.61 

1.27 

0.81 

0.59 

1.49 

3 

0.82 

.08 

1.75 

2.04 

2.90 

2.73 

2.64 

2.24 

1.87 

1.41 

0.88 

0.70 

1.75 

4 

;    0.96 

.09 

1.89 

2.21 

3.10 

2.82 

2.62 

2.23 

2.04 

1.52 

0.91 

0.69 

1.84 

5 

1.03 

.28 

2.01 

2.37 

3.10 

2.75 

2.59 

2.24 

2.14 

1.72 

1.03 

0.81 

1.92 

6 

1.06 

.34 

2.14 

2.28 

2.76 

2.45 

2.31 

2.26 

2.18 

1.77 

1.03 

0.87 

1.S7 

7 

1.09 

.36 

2.06 

1.86 

1.89 

1.53J    1.61 

1.74 

1.94 

1.74 

1.06 

0.94 

1.57 

8 

1.12 

.24 

1.58 

1.06 

0.84 

0.63 

0.67 

0.89 

1.15 

1.26 

1.07 

1.00 

1.04 

9 

0.91 

0.75 

0.76 

0.14 

-0.10 

-0.25 

0.20 

0.04 

0.33 

0.48 

0.64 

0.74 

0.39 

10 

0.38 

0.04 

-0.06 

-0.67 

-0.92 

-1.10 

-0.97 

-0.76 

-0.53 

-0.35 

0.06 

0.21 

-0.39 

11 

-0.26 

-0.62 

-0.96 

-1.39 

-1.80 

-1.87 

-1.63 

-1.40 

-1.25 

-1.17 

-0.62 

-0.35 

-1.11 

Noon. 

-0.90 

-1.19 

-1.75 

-1.99 

-2.36 

-2.90 

-2.14 

-2.13 

-2.00 

-1.84 

-1.25 

-0.93 

-1.78 

1 

-1.47 

-1.68  -2.26 

-2.48 

-2.82 

-2.84 

-2.59 

-2.59 

-1.48 

-2.39 

-1.68 

-1.47 

-2.15 

2 

-1.70 

-1.96 

-2.55 

-2.74 

-3.08 

-3.03 

-2.77 

-2.73 

-2.71 

-2.55 

-1.85 

-1.64 

-2.44 

3 

-1.68 

-2.04 

-2.61 

-2.74 

-3.21 

-3.04 

-2.90 

-2.75 

-2.67 

-2.51 

-1.75 

-1.55 

-2.45 

4 

-1.40 

-1.80 

-2.55 

-2.60 

-3.27 

-3.00  '-2.90 

-2.85 

-2.56 

-2.21 

-1.37 

-1.19 

-2.31 

5 

-1.00 

-1.46 

-2.26 

-2.10 

-2.97 

-2.64 

-2.64 

-2.46 

-2.09 

-1.63 

-0.85 

-0.72 

-1.90 

6 

-0.60 

-0.76 

-1.51 

-1.52 

-2.27 

-2.10 

-2.05 

-1.78 

-1.31 

-0.83 

-0.35 

-0.42 

-1.29 

7 

-0.31 

-0.27 

-0.76 

-0.75 

-1.43 

-l.2lj-l.24 

-0.85 

-0.48 

-0.29 

-0.10 

-0.15 

-0.65 

8 

-0.25 

-0.02 

-0.16 

-0.07 

-0.43 

-0.13-0.24 

0.06 

0.15 

0.16 

0.11 

0.04 

-0.06 

9 

-0.04 

0.20 

0.17 

0.51 

0.48 

0.71 

0.67 

0.70 

0.50 

0.48 

0.24 

0.17 

0.40 

10 

0.12 

0.43 

0.46 

0.81 

1.03 

1.41 

1.22 

1.09 

0.78 

0.76 

0.34 

0.33 

0.73 

11 

0.28 

0.53 

0.76 

1.08 

1.50 

1.70 

1.56 

1.38 

0.76 

1.03 

0.52 

0.41 

0.96 

Vlean. 

-2:71 

1.14 

2.49 

6.90 

10.42 

13.22 

13.93 

13.66    10.30  1  7.37 

1.52 

1.63  ! 

XLII. 

GERMANY.  —  MUNICH.     Lat,  48°  9'  N.    Long.  11°  37'  E.  Greenw.—  DOVE. 

Degrees  of  Reaumur. 

Hour. 

Jan, 

Feb. 

March. 

April. 

May. 

June 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn, 

0.71 

0.92 

1.54 

2.27 

2.58 

2.49 

2.84 

2.37 

•2.17 

1.53 

0.91 

0.46 

1.73 

1 

0.90 

1.04 

1.83 

2.37 

3.02 

3.06 

3.27 

2.64 

2.33 

1.59 

0.87 

0.58 

1.96 

2 

0.97 

1.18 

2.04 

2.62 

3.30 

3.39 

3.56 

2.94 

2.61 

1.67 

0.94 

0.67 

2.16 

3 

.04 

1.30 

2.16 

2.89 

3.61 

3.66 

3.80 

3.19 

2.81 

1.78 

1.00 

0.77 

2.33 

4 

.03 

1.33 

2.25 

3.12 

3.85 

3.82 

4.05 

3.41 

2.98 

1.91 

1.04 

0.85 

2.47 

5 

.07 

1.43 

2.37 

3.29 

3.69 

3.25 

3.71 

3.50 

3.16 

2.01 

1.12 

0.92 

2.46 

6 

.14 

1.52 

2.56 

2.93 

2.61 

2  11 

2.41 

2.79 

3.08 

2.14 

1  13 

0.99 

2.12 

7 

.17 

1.55 

2.17 

1.80 

1.21 

0.77 

0.93 

1.48 

2.22 

1.84 

1.13 

0.97 

1.44 

8 

.10 

1.14 

1.14 

0.36  -0.07 

-0.35 

-0.28 

0.18 

0.59 

0.99 

0.75 

0.88 

0.54 

9 

0.46 

0.36 

-0.11 

-0.79  -1.00 

-1.21 

-1.25 

-1.05 

-0.74 

-0.24 

0.06 

0.41 

-0.42 

10 

-0.72 

-0.61 

-1.18  -1.80-1.99 

-1.96 

-2.12  -1.88  -1.70 

-1.34 

-0.79 

-0.42 

-1.38 

11 

-1.06 

-1.46 

-2.01 

-2.39  -2.59 

-2.69 

-2.66  -2.58-2.61 

-2.19 

-1.49-0.97, 

-2.06 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

52 


XLII. 

GERMANY.  —  MUNICH,   Continued. 

Corrections  to  be  applied  to  the  Moans  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour. 

Jan. 

Feb.    |  March.    April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Noon 

-1.70 

-1.93 

-2.67  -2.99  -3.28 

-2.98 

-3.14 

-3.09 

-3.18 

-2.69 

-1.94 

-1.02 

-2.55 

1 

-2.0S 

-2.31  -3.01  -3.27  -3.59 

-3.41 

-3.48 

-3.55 

-3.58 

-3.08 

-2.23 

-1.83 

-2.95 

2 

-2.15 

-2.40  -3.24  -3.60-3.77 

-3.79 

-3.75 

-3.72 

-3.74  -3.15 

-2.05  -1.85 

-3.10 

3 

-1.83 

-2.15 

-3.17  -3.45-3.77 

-3.54 

-3.83  -3.58 

-3.56-2.87  -1.75 

-1.43 

-2.9l! 

4 

-1.08 

-1.67 

-2.64  -3.18  -3.41 

-3.34 

-3.49 

-3.30 

-3.24 

-2.27 

-1.02 

-0.76 

-2.45 

5 

-0.46 

-0.95 

-1.98-2.51 

-2.87 

-2.80 

-3.07 

-2.76 

-2.56 

-1.27 

-0.43 

-0.34 

-1.83 

6 

-0.16 

-0.37 

-0.94-1.53 

-2.05 

-1.94 

-2.32 

-1.81 

-1.29 

-0.44 

-0.12 

-0.13 

-1.09; 

7 

0.01 

-0.07 

-0.20  -0.36  -0.74 

-0.84 

-2.99 

-0.47 

-0.30 

0.08 

0.20 

0.06 

-0.471 

8 

0.23 

0.22 

0.28     0.40 

0.41 

0.61 

0.40 

0.55 

0.37 

0.56 

0.44 

0.14 

0.38 

9 

0.39 

0.45 

0.55 

0.91 

1.13 

1.35 

1.20 

1.15 

0.93 

0.88 

0.57 

0.23 

O.S1 

10 

0.49 

0.59 

1.02 

1.31 

1.65 

1.86 

1.87 

1.60 

1.40 

1.14 

0.74 

0.33 

1.17 

11 

0.61 

0.77 

1.33     1.69 

2.18 

2.28 

2.41 

2.06 

1.80 

1.34 

0.85 

0.40 

1.48 

Mean. 

-2.15 

-0.12 

0.75     5.57 

9.29 

12.74 

13.65    12.93 

9.45 

6.28 

1.55 

-1.28 

XLIII. 

BOHEMIA.  —  PRAGUE.     Lat.  50°  5'  N.     Long.  14°  25'  E.  Greenw.  —  DOVE. 

Degrees  of  Reaumur. 

Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn 

0.30 

0.52 

1.03 

1.47 

1.70 

1.68 

1.72 

1.17 

1.23 

0.84 

0.36 

0.25 

1.02 

1 

0.40 

0.60 

1.14 

1.68 

1.97 

1.97 

2.05 

1.78 

1.49 

1.02 

0.45 

0.32 

1.24 

2 

0.50 

0.71 

1.29 

1.95 

2.25 

2.23 

2.34 

2.10 

1-72 

.19 

0.54 

0.39 

1.43 

3 

0.55 

0.83 

1.44 

2.17 

2.46 

2.47 

2.60 

2.3S 

1.96 

.31 

0.61 

0.50 

1.61 

4 

0.65 

0.89 

1.60 

2.39 

2.75 

2.71 

2.91 

2.63 

2,19 

.49 

0.70 

0.56 

1.79 

5 

0.71 

0.99 

1.72 

2.64 

2.96 

2.86 

3.07 

2.88 

2.43 

.65 

0.77 

0.65 

1.94 

6 

0.77 

1.00 

1.81 

2.75 

2.96 

2.71 

2.92 

2.93 

2.61 

.73 

0.82 

0.72 

1.98 

7 

0.68 

0.99 

1.53 

2.32 

2.11 

1.88 

2.13 

2.34 

2.29 

.65 

0.79 

0.73 

1.62 

8 

0.73 

0.88 

1.28 

1.29 

0.98 

0.82 

1.02 

1.30 

1.62 

.29 

0.66 

0.70 

1.05 

9 

0.62 

0.57 

0.63 

0.32' 

0.06 

-0.14 

0.17 

0.21 

0.60 

0.70 

0.41 

0.54 

0.39 

10 

0.26 

0.15 

-0.11 

-0.53 

-0.91 

-0.93 

-0.95 

-0.77 

-0.51 

-0.10 

-0.12 

0.17 

-o.r>6 

11 

-0.16 

-0.45 

-0.77 

-1.51 

-1.60 

-1.58 

-1.62 

-1.50 

-1.46 

-0.86 

-0.46 

-0.22 

-1.02 

Noon, 

-0.60 

-0.92 

-1.37 

-2.09 

-2.16 

-2.08 

-2.16 

-2.18 

-2.02 

-1.53 

-0.86 

-0.65 

-1.55 

1 

-0.93 

-1.27 

-1.83 

-2.48 

-2.56 

-2.48 

-2.59 

-2.61 

-2.56 

-2.01 

-1.13 

-0.95 

-1.95 

2 

-1.10 

-1.50 

-2.20 

-2.74 

-2.80 

-2.73 

-2.83 

-2.89 

-2.84 

-2.31 

-1.25 

-1.07 

-2.19 

3 

-1.11 

-1.51 

-2.29 

-2.88 

-2.90 

-2.79 

-2.93 

-3.01 

-2.96 

-2.32  -1.28 

-0.99 

-2.25 

4 

-0.93 

-1.35  -2.20 

-2.76 

-2.82 

-2.71   -2.92 

-2.85 

-2.78 

-2.10 

-0.87 

-0.79 

-2.09 

5 

-0.68 

-0.97 

-1.83 

-2.46 

-2.53 

-2.56 

-2.83 

-2.66 

-2.35 

-1.58 

-0.62 

-0.55 

-1.80 

6 

-0.44 

-0.61 

-1.26 

-1.91 

-2.17 

-2.10 

-2.36 

-2.11 

-1.64 

-1.01 

-0.36 

-0.37 

-1.36 

7 

-0.31 

-0.32 

-0.70 

-1.12 

-1.49 

-1.37 

-1.59 

-1.23 

-0.87 

-0.54 

-0.19 

-0.21 

-O.S3 

8 

-0.23 

-0.06 

-0:24 

-0.33 

-0.51 

-0.39 

-0.58 

-0.34 

-0.24 

-0.10 

0.01 

-0.19 

-0.27 

9 

0.01 

0.12 

0.09 

0.20 

0.27 

0.30 

0.22 

0.20 

0.27 

0.23 

0.16 

0.06 

0.18 

10 

0.10 

0.26 

0.40 

0.72 

0.80 

0.91 

0.90 

0.81 

0.74 

0.51 

0.29 

0.16 

0.55 

11 

0.19 

0.39 

0.66 

1.12 

1.24 

1.28 

1.32 

1.20 

1.08 

0.85 

0.43 

0.25 

0.83 

Mean.   -1.69 

0.64 

2.20 

7.27 

11.27   14.47    15.66 

15.01    11.52 

7.94 

3.02 

-0.12 

i 

The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

53 


XLIV. 
BOHEMIA.  —  PRAGUE.     Lat.  50°  5'  N.     Long.  14°  24'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.45 

0.76 

0.86 

1.73 

1.47 

1.90 

1.93 

1.59 

.46 

1.06 

0.73 

0.45 

,.» 

2 

0.52 

0.88 

.05 

2.06 

1.77 

2.22 

2.24 

1.85 

.69 

1.18 

0.79 

0.52 

1.40 

3 

0.54 

0.98 

.24 

2.45 

2.08 

2.62 

2.36 

2.04 

.85 

1.23 

0.82 

0.54 

1.56 

4 

0.53 

1.06 

.42 

2.82 

2.31 

3.02 

2.27 

2.10 

.95 

1.24 

0.78 

0.55 

1.67 

5 

0.50 

1.14 

.55 

3.02 

2.35 

3.22 

2.01 

2.01 

.97 

1.22 

0.78 

0.60 

1.70 

6 

0.49 

1.15 

.60 

2.92 

2.12 

3.03 

1.62 

1.76 

.90 

1.19 

0.80 

0.70 

1.61 

7 

0.47 

1.09 

.51 

2.43 

1.62 

2.40 

1.16 

1.36 

.69 

1.10 

0.77 

0.80 

1.37 

8 

0.42 

0.91 

.24 

1.59 

0.92 

1.40 

0.66 

0.83 

.28 

0.90 

0.69 

0.82 

0.97 

9 

0.29 

0.55 

0.77 

0.53 

0.15 

0.24 

0.10 

0.19 

0.64 

0.51 

0.42 

067 

0.42 

10 

0.08 

-1.01 

0.16 

-0.56 

-0.57 

-0.85 

-0.52 

-0.51 

-0.20 

-0.07 

-0.02 

0.31 

-0.31 

11 

-0.21 

-  .19 

-0.52 

-1.52 

-1.16 

-1.68 

-1.19 

-1.23 

-1.14 

-0.78 

-0.55 

-1.18 

-0.95 

Noon.  .  . 

-0.52 

-  .10 

-1.16 

-2.25 

-1.60 

-2.23 

-1.84 

-1.86 

-2.00 

-1.47 

-1.10 

-0.70 

-1.49 

1 

-0.76 

-  .51 

-1.63 

-2.74 

-1.91 

-2.55 

-2.37 

-2.33 

-2.63 

-1.99 

-1.47 

-1.08 

-1.91 

2 

-0.88 

-  .70 

-1.89 

-3.00 

-2.14 

-2.76 

-2.66 

-2.57 

-2.89 

-2.21 

-1.58 

-1.23 

-2.13 

3 

-0.85 

-  .64 

-1.92 

-3.08 

-2.26 

-2.92 

-2.65 

-2.53 

-2.76 

-2.08 

-1.44 

-1.13 

-2.11 

4 

-0.71 

-  .39 

-1.75 

-2.97 

-2.26 

-2.98 

-2.36 

-2.23 

-2.31 

-1.68 

-1.08 

-0.87 

-1.88 

5 

-0.51 

-1.05 

-1.45 

-2.65 

-2.08 

-2.86 

-1.86 

-1.75 

-1.70 

-1.14 

-0.67 

-0.56 

-1.52 

6 

-0.31 

-0.66 

-1.10 

-2.13 

-1.71 

-2.45 

-1.28 

-1.18 

-1.07 

-0.60 

-0.31 

-0.31 

-1.09 

7 

-0.16 

-0.34 

-0.73 

-1.42 

-1.17 

-1.75 

-0.73 

-0.62 

-0.52 

-0.17 

-0.04 

-0.17 

-0.65 

8 

-0.06 

-0.09 

-0.40 

-0.64 

-0.56 

-0.85 

-0.24 

-0.12 

-0.08 

0.13 

0.10 

-0.11 

-0.24 

9 

0.02 

0.11 

0.10 

0.11 

0.03 

0.06 

0.19 

0.30 

0.26 

0.34 

0.20 

0.07 

0.12 

10 

0.11 

1.35 

0.18 

0.71 

0.52 

0.81 

0.61 

0.65 

0.57 

0.51 

0.32 

0.01 

0.53 

11 

0.22 

1.10 

0.42 

1.15 

0.89 

1.32 

1.05 

0.97 

0.87 

0.70 

0.44 

0.14 

0.77 

Midn.  .  . 

0.34 

0.61 

0.65 

1.46 

1.18 

1.64 

1.51 

1.28 

1.17 

0.89 

0.61 

0.31 

097 

\ 

6.  6 

0.09 

0.24 

0.25 

0.40 

0.21 

0.29 

0.17 

0.29 

0.42 

0.29 

0.25 

0.19 

0.26 

7.  7 

0.15 

0.38 

0.39 

0.50 

0.22 

0.33 

0.22 

0.37 

0.59 

0.47 

0.37 

0.32 

0.36 

8.  8 

0.18 

0.41 

0.42 

0.47 

0.18 

0.27 

0.21 

0.36 

0.60 

0.51 

0.39 

0.35 

0.36 

9.  9 

0.16 

0.33 

0.34 

0.32 

0.90 

0.15 

0.15 

0.25 

0.45 

0.42 

0.31 

0.30 

0.27 

10.10 

0.09 

0.17 

0.17 

0.08 

-0.03 

-0.02 

0.04 

0.07 

0.18 

0-22 

0.15 

0.16 

0.11 

7.  2.  9 

-0.13 

-0.17 

-0.16 

-0.15 

-0.16 

-0.10 

-0.44 

-0.30 

-0.31 

-0.26 

-0.20 

-0.17 

-0.21 

6.  2.  8 

-0.15 

-0.21 

-0.23 

-0.24 

-0.19 

-0.19 

-0.43 

-0.31 

-0.36 

-0.30 

-0-23 

-0.21 

-0.25 

6.  2.10 

-0.09 

0.27 

-0.04 

0.21 

0.17 

0.36 

-0.14 

-0.05 

-0.14 

-0.17 

-0.15 

-0.17 

0.01 

6.  2.  6 

-0.23 

-0.40 

-0.46 

-0.74 

-0.58 

-0.73 

-0.77 

-0.66 

-0.69 

-0.54 

-0.36 

-0.28 

-0.54 

7.  2 

-0.21 

-0.31 

-0.19 

-0.29 

-0.26 

-0.18 

-0.75 

-0.61 

-0.60 

-0.56 

-0.41 

-0.22 

-0.38 

8.  2 

-0.23 

-0.40 

-0.33 

-0.71 

-0.61 

-0.68 

-1.00 

-0.87 

-0.81 

-0.66 

-0.45 

-0.21 

-0.58 

8.  1 

-0.17 

-0.30 

-0.20 

-0.58 

-0.50 

-0.58 

-0.86 

-0.75 

-0.68 

-0.55 

-0.39 

-0.13 

-0.97 

7.  1 

-0.15 

-0.21 

-0.06 

-0.16 

-0.15 

-0.08 

-0.61 

-0.49 

-0.47 

-0.45 

-0.35 

-0.14 

-0.28 

9.12.3.9 

-0.27 

-0.52 

-0.60 

-1.17 

-0.92 

-1.21 

-1.05 

-0.98 

-0.97 

-0.68 

-0.48 

-0.31 

-0.76 

7,  2.2(9) 

-0.09 

-0.10 

-0.15 

-0.09 

-0.12 

-0.06 

-0.28 

-0.15 

-0.17 

-0.11 

-0.10 

-0.14 

-0.13 

Dail.  ext. 

-0.17 

-0.18 

-0.16 

-0.03 

0.05 

0.12 

-0.15 

-0.24 

-0.46 

-0.49 

-0.38 

-0.21 

-0.22 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

54 


XLV. 

ENGLAND.  —  PLYMOUTH.     Lat.  50°  22'  N.     Long.  4°  7'  W.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 

Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Fahrenheit. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.86 

1.46 

2  32 

4.01 

5.13 

4.34 

4.75 

4.16 

3.24 

2.66 

1.58 

0.95 

2.95 

2 

0.90 

1.67 

2.63 

4.43 

5.94 

4.82 

5.38 

4.79 

3.60 

2.79 

1.69 

0.86 

3.29 

3 

0.99 

1.87 

302 

4.91 

6.62 

5.13 

5.69 

5.45 

4.03 

3.02 

1.80 

0.74 

3.60 

4 

1.15 

2.12 

3.31 

5.13 

6.75 

5.00 

5.58 

5.76 

4.34 

3.31 

1.96 

0.81 

3.76 

5 

1.37 

2.36 

3.40 

4.91 

6.03 

4.57 

4.82 

5.42 

4.25 

3.51 

2.09 

1.04 

3.65. 

6 

1.53 

2.48 

3-08 

3.98 

4.37 

2.79 

3.35 

4.21 

3.62 

3.38 

2.14 

1.31 

3.02 

7 

1.46 

2.30 

2.25 

2.39 

2.00 

0.95 

1.92 

2.25 

2.32 

2.66 

1.89 

1.40 

1.94 

8 

1.10 

1.67 

0.97 

0.29 

-0.54 

-1.01 

-0.65 

-0.11 

0.50 

1.26 

1.24 

1.13 

0.50 

9 

0.36 

0.59 

-o.cn 

-1.94 

-2.88 

-2.70 

-2.57 

-2.39 

-1.53 

-0.65 

0.16 

0.41 

-1.15 

10 

-0.61 

-0.83 

-2.23 

-3.94 

-4.57 

-3.87 

-4.03 

-4.21 

-3.44 

-2.70 

-1.17 

-0.61 

-2.68 

11 

-1-58 

-2.25 

-3.56 

-5.40 

-5.63 

-4.64 

-5.02 

-5.36 

-4.93 

-4.41 

-2.43 

-1.67 

-3.92 

-2.32 

-3.33 

-4.43 

-6.17 

-6.12 

-4.93 

-5.58 

-5.87 

-5.74 

-5.40 

-3.29 

-2.43 

-4.64 

Noon.  1 

-2.63 

-3.85 

-4.70 

-6.37 

-6.37 

-5.02 

-5.81 

-5.96 

-5.92 

-5.51 

-3.56 

-2.70 

-4.86 

2 

-2.50 

-3.69 

-4.43 

-5.99 

-6.37 

-4.91 

-5.76 

-5.72 

-5.49 

-4.84 

-3.22 

-2.45 

-4.61 

3 

-1.96 

-3.02 

-3.74 

-5.22 

-6.12 

-4.64 

-5.40 

-5.27 

-4.64 

-3.71 

-2.45 

-1.85 

-4.01 

4 

-1.26 

-2.07 

-2.81 

-4.14 

-5.47 

-4.03 

-4.64 

-4.52 

-3.49 

-2.45 

-1.55 

-1.10 

-3.13 

5 

-0.59 

-1.10 

-1.76 

-2.86 

-4.32 

-3.04 

-3.47 

-3.44 

-2.18 

-1.33 

-0.77 

-0.41 

-2.12 

6 

-0.07 

-0.38 

-0.74 

-1.42 

-2.68 

-1.73 

-2.00 

-2.23 

-0.88 

-0.45 

-0.23 

0.05 

-1.06 

7 

0.29 

0.09 

0.14 

0.00 

-0.81 

-0.27 

-0.38 

-0.47 

0.36 

0.23 

0.07 

0.34 

-0.05 

8 

0.50 

0.36 

0.86 

1.26 

0.99 

0.74 

1.10 

1.06 

1.37 

0.79 

0.25 

0.52 

0.81 

9 

0.63 

056 

1.35 

2.25 

2.36 

2.21 

2.27 

2.23 

2.12 

1.33 

0.47 

0.72 

1.55 

10 

0.72 

0-77 

1.69 

2.93 

3.29 

2.93 

3.11 

2.97 

2.59 

1.85 

0.77 

0.88 

2.05 

11 

0.79 

0.99 

1.89 

3.35 

3.89 

3.44 

3.67 

3-40 

2.84 

2.23 

1.08 

1.01 

2.39 

Midn.  .  . 

0.83 

1.26 

2.07 

3.67 

4.46 

3.87 

4.21 

3.71 

2.99 

2.48 

1.37 

1.04 

2.66 

6.  6 

0.74 

1.06 

1.17 

1.28 

0.86 

0.54 

0.68 

0.99 

1.37 

1.46 

0.97 

0.68 

0.99 

7.  7 

0.88 

1  19 

1.19 

1.19 

0.61 

0.34 

0.52 

0.90 

1.35 

1.44 

0.99 

0.88 

0.95 

8.  8 

081 

1.01 

0.92 

0.79 

023 

0.14 

0.23 

0.47 

0.95 

1.04 

0.74 

0.83 

0.65 

9.  9 

0.50 

0.59 

0.36 

0.16 

-0.27 

-0.25 

-0.16 

-0.09 

0.29 

0.34 

0.32 

0.56 

0.20 

10.10 

0-07 

-0.05 

-0.27 

-0.52 

-0.65 

-0.47 

-0.47 

-0.63 

-0.43 

-0.43 

-0.20 

0.14 

-0.32 

7.  2.  9 

-0.14 

-0.27 

-0.27 

-0.45 

-0.68 

-0.59 

-0.70 

-0.41 

-0.^6 

-0.29 

-0.29 

-0.11 

-0.38 

6.  2.  S 

-0.16 

-0.29 

-0.16 

-0.25 

-0.34 

-0.45 

-0.43 

-0.16 

-0.16 

-0.23 

-0.27 

-0.20 

-0.25 

6.   2.10 

-0.09 

-0-16 

0.11 

0.32 

0  43 

0.27 

0.23 

0.50 

0.25 

0.14 

-0.11 

-0.09 

0.16 

6.  2.  6 

-0.34 

-0.54 

-0.70 

-1.15 

-1.55 

-1.28 

-1.46 

-1.24 

-0.92 

-0.63 

-0.43 

-0.36 

-0.88 

7.   2 

-0.52 

-0.70 

-1.10 

-1.80 

-2.18 

-1.98 

-2.18 

-1.73 

-1.60 

-1.10 

-0.68 

-0.54 

-1.35 

8.  2 

-0.70 

-1.01 

-1.73 

-2.86 

-3.47 

-2.97 

-3.22 

-2.93 

-2.50 

-1.80 

-0.99 

-0.68 

-2.07 

8.  1 

-0.77 

-1.10 

-1.87 

-3.04 

-3.47 

-3.02 

-3.24 

-3.04 

-2.72 

-2.14 

-1.17 

-0.79 

-2.21 

7.  1 

-0.59 

-0.79 

-1.24 

-2.00 

-2.18 

-2.05 

-2.21 

-1.87 

-1.80 

-1.44 

-0.83 

-0.65 

-1.46 

9.12.3.9 

-0.83 

-1.31 

-1.87 

-2.77 

-4.20 

-2.52 

-2.81 

-2.84 

-2.45 

-2.12 

-1.28 

-0.79 

-2.07 

7.  2.2(9) 

0.07  -0.07 

0.14 

0.23 

0.09 

0.11 

0.05 

0.25 

0.27 

0.11 

-0.09 

0.09 

0.11 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

55 


XLVT. 

ENGLAND.  —  PLYMOUTH.     Lett.  50°  22'  N.     Long.  4°  7'  W. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 
1.93 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.38 

0.65 

1.03 

1.78 

2.28 

2.11 

1.85 

1.44 

1.18 

0.70 

0.42 

1.31 

2 

0.40 

0.74 

1.17 

1.97 

2.64 

2.14 

2.39 

2.13 

1.60 

1.24 

0.75 

0.38 

1.46 

3 

0.44 

0.83 

1.34 

2.18 

2.94 

2.28 

2.53 

2.42 

1.79 

1.34 

0.80 

0.33 

1.60 

4 

0.51 

0.94 

1.47 

2.28 

3.00 

2.22 

2.48 

2.56 

1.93 

1.47 

0.87 

0.36 

1.67 

5 

0.61 

1.05 

1.51 

2.18 

2.68 

2.03 

2.14 

2.41 

1.89 

1.56 

0.93 

0.46 

1.62 

6 

0.68 

1.10 

1.37 

1.77 

1.94 

1.24 

1.49 

1.87 

1.61 

1.50 

0.95 

0.58 

1.34 

7 

0.65 

1.02 

1.00 

1.06 

0.89 

0.42 

0.63 

1.00 

1.03 

1.18 

0.84 

0.62 

0.86 

8 

0.49 

0.74 

0.43 

0.13 

-0.24 

-0.45 

-0.29 

-0.05 

0.22 

0.56 

0.55 

0.50 

0.22 

9 
10 
11 

0.16 
-0.27 
-0.70 

0.26 
-0.37 
-1.00 

-0.28 
-0.99 
-1.58 

-0.86 
-1.75 
-2.40 

-1.28 
-2.03 
-2.50 

-1.20 
-1.72 

-2.06 

-1.14 
-1.79 
-2.23 

-1.06 
-1.87 

-2.38 

-0.68 
-1.53 
-2.19 

-0.29 
-1.20 
-1.96 

0.07 
-0.52 

-l.OS 

0.18 
-0.27 
-0.74 

-0.51 
-1.19 
-1.74 

Noon.  .  . 

-1.03 

-1.48 

-1.97 

-2.74 

-2.72 

-2.19 

-2.48 

-2.61 

-2.55 

-2.40 

-1.46 

-1.08 

-2.06 

1 

-1.17 

-1.71 

-2.09 

-2.83 

-2.83 

-2.23 

-2.58 

-2.65 

-2.63 

-2.45 

-1.58 

-1.20 

-2.16 

2 

-1.11 

-1.64 

-1.97 

-2.66 

-2.S3 

-2.18 

-2.56 

-2.54 

-2.44 

-2.15 

-1.43 

-1.09 

-2.05 

3 

-0.87 

-1.34 

-1.66 

-2.32 

-2.72 

-2.06 

-2.40 

-2.34 

-2.06 

-1.65 

-].09 

-0.82 

-1.78 

4 

-0.56 

-0.92 

-1.25 

-1.84 

-2.43 

-1.79 

-2.06 

-2.01 

-1.55 

-1.09 

-0.69 

-0.49 

-1.39 

5 

-0.26 

-0.49 

-0.78 

-1.27 

-1.92 

-1.35 

-1.54 

-1.53 

-0.97 

-0.59 

-0.34 

-0.18 

-0.94 

6 

-0.03 

-0.17 

-0.33 

-0.63 

-1.19 

-0.77 

-0.89 

-0.99 

-0.39 

-0.20 

-0.10 

0.02 

-0.47 

7 

0.13 

0.04 

0.06 

-0.00 

-0.36 

-0.12 

-0.17 

-0.21 

0.16 

0.10 

0.03 

0.15 

-0.02 

8 

0.22 

0.16 

0.38 

0.56 

0.44 

0.33 

0.49 

0.47 

0.61 

0.35 

0.11 

0.23 

0.36 

9 

0.28 

0.25 

0.60 

1.00 

1.05 

0.98 

1.01 

0.99 

0.94 

0.59 

0.21 

0.32 

0.69 

10 

0.32 

0.34 

0.75 

1.30 

1.46 

1.30 

1.38 

1.32 

1.15 

0.82 

0.34 

0.39 

0.91 

11 

0.35 

0.44 

0.84 

1.49 

1.73 

1.53 

1.63 

1.51 

1.26 

0.99 

0.48 

0.45 

1.06 

Midn.  .  . 

0.37 

0.56 

0.92 

1.63 

1.98 

1.72 

1.87 

1.65 

1.33 

1.10 

0.61 

0.46 

1.18 

6.  6 

0.33 

0.47 

0.52 

0.57 

0.38 

0.24 

0.30 

0.44 

0.61 

0.65 

0.43 

0.30 

0.44 

7.  7 

0.39 

0.53 

0.53 

0.53 

0.27 

0.15 

0.23 

0.40 

0.60 

0.64 

0.44 

0.39 

0.-12 

8.  8 

0.36 

0.45 

0.41 

0.35 

0.10 

-0.06 

0.10 

0.21 

0.42 

0.46 

0.33 

0.37 

0.29 

9.  9 

0.22 

0.26 

0.16 

0.07 

-0.12 

-0.11 

-0.07 

-0.04 

0.13 

0.15 

0.14 

0.25 

0.09 

10.10 

0.03 

-0.02 

-0.12 

-0.23 

-0.29 

-0.21 

-0.21 

-0.28 

-0.19 

-0.19 

-0.09 

0.06 

-0.14 

7.  2.  9 

-0.06 

-0.12 

-0.12 

-0.20 

-0.30 

-0.26 

-0.31 

-0.18 

-0.16 

-0.13 

-0.13 

-0.05 

-0.17 

6.  2.  8 

-0.07 

-0.13 

-0107 

-0.11 

-0.15 

-0.20 

-0.19 

-0.07 

-0.07 

-0.10 

-0.12 

-0.09 

-0.11 

6.  2.10 

-0.04 

-0.07 

0.05 

0.14 

0.19 

0.12 

0.10 

0.22 

0.11 

0.06 

-0.05 

-0.04  j    0.07 

6.  2.  6 

-0.15 

-0.24 

-0.31 

-0.51 

-0.69 

-0.57 

-0.65 

-0.55 

-0.41 

-0.28 

-0.19 

-0.16 

-0.39 

7.  2 

-0.23 

-0.31 

-0.42 

-0.80 

-0.97 

-0.88 

-0.97 

-0.77 

-0.71 

-0.49 

-0.30 

-0.24 

-0.60 

8.  2 

-0.31 

-0.45 

-0.77 

-1.27 

-1.54 

-1.32 

-1.43 

-1.30 

-1.11 

-0.80 

-0.44 

-0.30 

-0.92 

8.  1 

-0.34 

-0.49 

-0.83 

-1.35 

-1.54 

-1.34 

-1.44 

-1.35 

-1.21 

-0.95 

-0.52 

-0.35 

-0.98 

7.  1 

-0.26 

-0.35 

-0.55 

-0.89 

-0.97 

-0.91 

-0.98 

-0.83 

-0.80 

-0.64 

-0.37 

-0.29 

-0.65 

9.12.3.9 

-0.37 

-0.58 

-0.83 

-1.23 

-1.42 

-1.12 

-1.25 

-1.26 

-1.09 

-0.94 

-0.57 

-0.35 

-0.92 

7.  2.2(9) 

0.03 

-0.03 

0.06 

0.10 

0.04 

0.05 

0.02 

0.11 

0.12 

0.05 

-0.04 

0.04 

0>05 

Dail.ext. 

-0.25 

-0.31 

-0.29 

-0.28 

0.09 

0.03 

-0.03 

-0.05-0.35 

-0.45 

-0.32 

-0.29  -0.25 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

56 


XLVII. 
BELGIUM.  —  BRUSSELS.     Lat.  50°  51'  N.     Long.  4°  22'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

Ap.-il. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.53 

0.67 

1.19 

2.23 

2.57 

2.83 

2.34 

2.49 

1.71 

0.85 

0.49 

0.73 

1.56 

2 

0.60 

0.73 

1.36 

2.59 

2.89 

3.12 

2.57 

2.84 

2.00 

0.99 

0.49 

0.39 

1.71 

3 

0.60 

0.79 

1.54 

2.99 

3.17 

3.18 

2.74 

3.20 

2.33 

1.15 

0.54 

0.08 

1.86 

4 

0.60 

0.86 

1.70 

3.29 

3.28 

3.14 

2.74 

3.42 

2.57 

1.31 

0.65 

0.02 

1.97 

5 

0.62 

0.92 

1.79 

3.29 

3.06 

2.71 

2.47 

3.32 

2.58 

1.40 

0.77 

0.25 

1.93 

6 

0.64 

0.97 

1.74 

2.86 

2.45 

2.00 

1.88 

2.82 

2.28 

1.35 

0.85 

0.65 

1.71 

7 

0.61 

0.93 

1.50 

2.01 

1.52 

1.10 

1.06 

1.94 

1.67 

1.11 

0.81 

0.97 

1.27 

8 

0.46 

0.75 

1.03 

0.86 

0.44 

0.16 

0.15 

0.82 

0.82 

0.68 

0.58 

0.97 

0.64 

9 

0.18 

0.39 

0.39 

-0.35 

-0.59 

-0.61 

-0.69 

-0.34 

-0.14 

0.08 

0.19 

0.56 

-0.08 

10 

-0.22 

-0.13 

-0.36 

-1.42 

-1.43 

-1.35 

-1.33 

-1.37 

-1.06 

-0.60 

-0.31 

-0.13 

-0.81 

11 

-0.65 

-0.71 

-1.11 

-2.23 

-2.06 

-1.86 

-1.77 

-2.19 

-1.86 

-1.23 

-0.80 

-0.84 

-1.44 

Noon.  .  . 

-1.01 

-1.23 

-1.72 

-2.77 

-2.52 

-2.27 

-2.06 

-2.81 

-2.48 

-1.71 

-1.16 

-1.29 

-1.92 

1 

-1.20 

-1.57 

-2.13 

-3.11 

-2.89 

-2.65 

-2.29 

-3.27 

-2.88 

-1.96 

-1.32 

-1.33 

-2.22 

2 

-1.19 

-1.65 

-2.29 

-3.29 

-3.21 

-2.97 

-2.51 

-3.58 

-3.05 

-1.95 

-1.27 

-1.03 

-2.33 

3 

-0.99 

-1.49 

-2.21 

-3.33 

-3.40 

-3.25 

-2.69 

-3.69 

-2.98 

-1.71 

-1.05 

-0.59 

-2.28 

4 

-0.70 

-1.14 

-1.93 

-3.18 

-3.36 

-3.16 

-2.71 

-3.53 

-2.63 

-1.31 

-0.75 

-0.26 

-2.06 

5 

-0.39 

-0.72 

-1.51 

-2.76 

-2.97 

-2.83 

-2.47 

-3.02 

-2.05 

-0.84 

-0.45 

-0.16 

-1.68 

6 

-0.15 

-0.33 

-1.03 

-2.05 

-2.21 

-2.17 

-1.91 

-2.19 

-1.30 

-0.39 

-0.18 

-0.25 

-1.18 

7 

0.02 

-0.03 

-0.55 

-1.13 

-1.20 

-1.28 

-1.11 

-1.15 

-0.49 

-0.01 

0.03 

-0.37 

-0.61 

8 

0.12 

0.17 

-0.10 

-0.16 

-0.12 

-0.31 

-0.20 

-0.09 

0.23 

0.28 

0.19 

-0.33 

-0.03 

9 

0.21 

0.31 

0.28 

0.69 

0.82 

0.68 

0.64 

0.82 

0.78 

0.48 

0.32 

0.05 

0.50 

10 

0.31 

0.41 

0.59 

1.31 

1.51 

1.37 

1.31 

1.48 

1.13 

0.60 

0.41 

0.37 

0.90 

11 

0.42 

0.50 

0.83 

1.70 

1.96 

1.97 

1.77 

1.89 

1.33 

0.68 

0.47 

0.75 

1.19 

Midn.  .  . 

0.52 

0.59 

1.02 

1.96 

2.28 

2.44 

2.08 

2.19 

1.49 

0.75 

0.49 

0.89 

1.39 

6.  6 

0.25 

0.32 

0.35 

0.41 

0.12 

-0.09 

-0.01 

0.31 

0.49 

0.48 

0.33 

0.20 

0.26 

7.  7 

0.31 

0.45 

0.47 

0.44 

0.16 

-0.09 

-0.02 

0.39 

0.59 

0.55 

0.42 

0.30 

0.33 

8.  8 

0.29 

0.46 

0.47 

0.35 

0.16 

-0.07 

-0.03 

0.37 

0.53 

0.48 

0.39 

0.32 

0.31 

9.  9 

0.20 

0.35 

0.34 

0.17 

0.12 

0.04 

-0.02 

0.24 

0.32 

0.28 

0.25 

0.25 

0.21 

10.10 

0.05 

0.14 

0.11 

0.05 

0.04 

0.01 

-0.01 

0.05 

0.03 

0.00 

0.05 

0.12 

0.05 

7.  2.  9 

-0.12 

-0.14 

-0.17 

-0.20 

-0.29 

-0.40 

-0.27 

-0.27 

-0.20 

-0.12 

-0.05 

-0.04 

-0.19 

6.  2.  8 

-0.14 

-0.17 

-0.22 

-0.20 

-0.29 

-0.43 

-0.28 

-0.28 

-0.18 

-0.11 

-0.08 

-0.24 

-0.22 

6.  2.10 

-0.08 

-0.09 

0.01 

0.29 

0.25 

0.13 

0.23 

0.24 

0.12 

0.00 

-0.00 

-0.00 

0.09 

6.  2.  6 

-0.23 

-0.34 

-0.53 

-0.83 

-0.99 

-1.05 

-0.85 

-0.98 

-0.69 

-0.33 

-0.20 

-0.21 

-0.60 

7.  2 

-0.29 

-0.36 

-0.40 

-0.64 

-0.85 

-0.94 

-0.73 

-0.82 

-0.69 

-0.42 

-0.23 

-0.03 

-0.53 

8.  2 

-0.37 

-0.45 

-0.63 

-1.22 

-1.39 

-1.41 

-1.18 

-1.38 

-1.12 

-0.64 

-0.35 

-0.03 

-0.85 

8.  1 

-0.37 

-0.41 

-0.55 

-1.13 

-1.23 

-1.25 

-1.07 

-1.23 

-1.03 

-0.64 

-0.37 

-0.18 

-0.79 

7.  1 

-0.30 

-0.32 

-0.32 

-0.55 

-0.69 

-0.78 

-0.62 

-0.67 

-0.61 

-0.43 

-0.26 

-0.18 

-0.48 

9.12.2.9 

-0.40 

-0-51 

-0.82 

-1.44 

-1.42 

-1.36 

-1.20 

-1.51 

-1.21 

-0.72 

0.43 

-0.34 

-0.95 

7.  2.2(9) 

-0.04 

-0.03 

-0.06 

0.03 

-0.01 

-0.13 

-0.04 

-0.00 

0.05 

0.03 

0.05 

-0.04 

-0.02 

Dail.ext. 

-0.28 

-0.34 

-0.25 

-0.02 

-0.06 

-0.04 

0.02 

-0.14 

-0.24 

-0.28 

-0.24 

-0.18 

-0.18 

The  numbers  without  si<rn  must  be  added  ;  those  with  the  sign  —  must  be  subtracted 

57 


XLVIII. 

BELGIUM.  —  BRUSSELS.     Lat.  50°  51'  N.     Long.  4°  22'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour. 

Jan. 

Feb. 

March. 

April. 

May.      June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn. 

0.30 

0.60 

1.09 

1.72     2.27 

2.46 

2.20 

1.88 

1.52 

0.92 

0.51 

0.30 

1.31 

2 

0.56 

0.82 

1.39 

2.19     3.00 

2.82 

2.77 

2.44 

2.03 

1.20 

0.77 

0.47 

1.70 

4 

0.64 

0.97 

1.66 

2.64     3.32     3.53 

3.14 

2.76 

2.38 

1.44 

0.83 

0.62 

1.99 

6 

0.66 

1.03 

1.83 

2.43 

2.44 

2.27 

2.30 

2.44 

2.47 

1.56 

0.93 

0.63 

1.75 

8 

0.67 

0.84 

1.02 

0.76 

0.49 

0.41 

0.32 

0.68 

1.03 

0.96 

0.79 

0.63 

0.72 

9 

0.36 

0.33 

0.21 

-0.38 

0.61  -0.61 

-0.63 

-0.39 

-0.14 

0.07 

0.21 

0.34 

0.00 

10 

0.07 

-0.09 

-0.54 

-1.18 

-1.43 

-1.32 

-1.36 

-1.26 

-1.19 

-0.78 

-0.36 

-0.08 

-0.79 

Noon. 

-0.92 

-1.27 

-1.78 

-2.42 

-2.61 

-2.47 

-2.35 

-2.47 

-2.46 

-1.87 

-1.27 

-0.83 

-1.S9 

2 

-1.15 

-1.65 

-2.30-2.95-3.22 

-3.21 

-2.92 

-3.08 

-3.04 

-2.17 

-1.42 

-1.04 

-2.35 

4 

-0.72 

-1.19 

-2.04  -2.63  -3.15 

-3.18 

-2.90  -2.93 

-2.70 

-1.61 

-0.90 

-0.65  '  -2.05 

6 

-0.21 

-0.49 

-0.94  -1.71  -2.44  -2.57 

-2.38  !  -1.87 

-1.21 

-0.37 

-0.28  -0.18  |  -1.22 

8 

-0.08 

-0.05 

-0.00 

0.13 

0.05 

-0.16 

-0.15 

0.17 

0.21 

0.23 

0.07 

-0.03      0.03 

9 

0.13 

0.17 

0.31 

0.63 

0.76 

0.80 

0.79 

0.76 

0.64 

0.43 

0.24 

0.48 

10 

0.20 

0.30 

0.58 

1.04 

1.25 

1.45 

1.39 

1.27 

1.01 

0.54 

0.38 

0.14, 

0.80 

Mean. 

0.52 

2.45 

3.56 

7.27 

10.37 

13.10 

13.69 

13.58 

11.22 

7.69 

4.72 

1.89 

XLIX. 

GERMANY.  —  SCHWERIN.     Lat.  53°  36'  N.     Long.  11°  30'  E.  Gr.—  DOVE. 

Degrees  of  Reaumur. 

1 

i 

Hour. 

Jan. 

Feb.      March. 

April. 

May. 

June. 

July.      Aug. 

Sept. 

Oct. 

Nov. 

Dec.       Year. 

Midn.  | 

0.05 

0.49 

0.92 

1.66 

1.97 

2.10 

2.12 

1.92 

1.70     0.87 

0.21 

0.16 

1.18 

2 

0.08 

0.69 

1.20 

2.17 

2.44 

2.69 

2.72 

2.41 

2.19 

1.14 

0.24 

0.34 

1.53 

4 

0.27 

0.83 

1.43 

2.53 

2.96 

2.97 

2.96 

2.62 

2.54 

1.51 

0.42 

0.48 

1.79 

6 

0.35 

0.86 

1.62 

2.67 

2.07 

1.80 

1.94 

2.13 

2.70 

1.67 

0.62 

0.48 

1.55 

8 

0.59 

1.19 

1.24 

0.98 

0.56 

0.25 

0.12 

0.32 

0.95 

1.21 

0.70 

0.63 

0.73 

10 

0.17 

0.18 

-0.11 

-0.97 

-1.15 

-1.20 

-1.26 

-1.17 

-1.12 

-0.34 

0.01 

0.13  -0.57! 

Noon. 

-0.42 

-0.97 

-1.32 

-2.34 

-2.47 

-2.36 

-2.20 

-2.29 

-2.42 

-1.80 

-0.77 

-0.43 

-1.65 

2 

-0.61 

-0.72 

-2.21 

-3.50 

-3.38 

-3.23 

-3.26 

-3.45 

-3.58 

-2.54 

-0.91 

-0.68 

-2.12 

4 

-0.43 

-1.22 

-2.13 

-2.86 

-2.70 

-2.62  -2.76 

-2.76 

-3.03 

-1.85 

-0.62 

-0.62  -1.97 

6 

-0.02 

-0.42 

-0.95 

-1.54  -1.62 

-1.71 

-1.70 

-1.37 

-1.32 

-0.55 

-0.23 

-0.27 

-0.98 

8 

-0.07 

-0.07 

-0.11 

0.13 

0.11 

-0.02 

0.08 

0.34 

0.26 

0.16 

0.02 

-0.14 

0.06 

10 

0.06 

0.21 

0.45 

1.01 

1.15 

1.28 

1.29 

1.30 

1.19 

0.57 

0.24 

-0.02 

0.73 

Mean. 

-1.05 

-2.00 

1.18 

5.26 

8.45 

12.19   13.50 

13.02 

10.42 

7.48 

1.42 

1 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

58 


L. 

PRUSSIA.  —  MUHLHAUSEN.     Lat..  51°  13'  N.     Long.  10°  27'  E.  G-reenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

I 

Jan. 

1 

Feb. 

March. 

.ipril. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.71 

.28 

1.10 

1.84 

2.40 

3.56 

2.91 

2.49 

1.95 

1.39 

0.47 

0.58 

1.72 

2 

0.75 

.30 

1.28 

2.19 

2.80 

3.97 

3.30 

2.80 

2.20 

1.65 

0.53 

0.59 

1.95 

.      3 

0.77 

.33 

1.46 

2.40 

3.06 

4.16 

3.50 

3.06 

3.29 

1.85 

0.60 

0.60 

2.17 

4 

0.82 

.40 

1.60 

2.74 

3.06 

3.98 

3.42 

3.14 

2.70 

1.99 

0.66 

0.62 

2.18 

5 

0.86 

.47 

1.62 

2.61 

2.67 

3.40 

3.00 

2.98 

2.73 

2.05 

0.68 

0.66 

2.06 

6 

0.91 

.50 

1.46 

2.25 

2.06 

2.49 

2.22 

2.51 

2.46 

1.93 

0.63 

0.67 

1.76 

7 

0.86 

.36 

1.11 

1.41 

1.15 

1.32 

1.20 

1.73 

1.03 

1.50 

0.46 

0.59 

1.14 

8 

0.62 

0.98 

0.55 

0.58 

0.16 

0.11 

0.09 

0.86 

0.87 

0.84 

0.16 

0.46 

0.52 

9 

0.21 

0.33 

-0.02 

-0.38 

-0.75 

-1.02 

-0.97 

-0.36 

-0.26 

-0.03 

-0.22 

0.03 

-0.29 

10 

-0.38 

-0.50 

-0.70 

-1.16 

-1.50 

-1.98 

-1.82 

-1.38 

-1.40 

-0.99 

-0.62 

-0.54 

-1.08 

11 

-0.93 

-1.35 

-1.30 

-1.97 

-2.06 

-2.77 

-2.46 

-2.24 

-2.42 

-1.88 

-0.92 

-0.77 

-1.76 

Noon.  .  . 

-1.38 

-2.02 

-1.76 

-2.42 

-2.44 

-3.39 

-2.94 

-2.89 

-3.14 

-2.53 

-1.09 

-1.06 

-2.26 

1 

-1.58 

-2.38 

-2.02 

-2.80 

-2.71 

-3.86 

-3.26 

-3.29 

-3.52 

-2.82 

-1.08 

-1.15 

-2.54 

2 

-1.52 

-2.38 

-2.07 

-2.94 

-2.87 

-4.14 

-3.42 

-3.46 

-3.54 

-2.99 

-0.89 

-1.10 

-2.61 

3 

-1.24 

-2.07 

-1.90 

-2.85 

-2.89 

-4.13 

-3.36 

-3.39 

-3.23 

-2.48 

-0.66 

-0.81 

-2.42 

4 

-0.84 

-1.56 

-1.58 

-2.39 

-2.69 

-3.78 

-3.06 

-3.07 

-2.65 

-1.89 

-0.39 

-0.50 

-2.03 

5 

-0.44 

-1.02 

-1.11 

-1.95 

-2.19 

-3.06 

-2.52 

-2.51 

-1.89 

-1.21 

-0.14 

-0.23 

-1.52 

6 

-0.20 

-0.54 

-0.62 

-1.20 

-1.59 

-2.10 

-1.76 

-1.76 

-1.06 

-0.58 

0.02 

-0.02 

-0.95 

7 

-0.04 

-0.17 

-0.18 

-0.47 

-0.83 

-1.02 

-0.85 

-0.90 

-0.24 

-0.03 

0.06 

0.12 

-0.38 

8 

0.18 

0.13 

0.16 

0.09 

-0.08 

0.05 

0.03 

-0.05 

0.50 

0.38 

0.22 

0.26 

0.16 

9 

0.27 

0.41 

0.45 

0.53 

0.58 

1.01 

0.81 

0.71 

0.99 

0.70 

0.26 

0.32 

0.59 

10 

0.37 

0.66 

0.64 

0.89 

1.10 

1.76 

1.46 

1.24 

1.35 

0.91 

0.34 

0.40 

0.93 

11 

0.53 

0.89 

0.78 

1.14 

1.56 

2.42 

2.01 

1.78 

1.58 

1.10 

0.38 

0.47 

1.22 

Midn.  .  . 

0.64 

1.08 

0.94 

1.58 

1.98 

3.05 

3.29 

2.16 

1.75 

1.26 

0.42 

0.54 

1.56 

6.  6 

0.36 

0.48 

0.42 

0.53 

0.24 

0.20 

0.23 

0.38 

0.70 

0.68 

0.33 

0.33 

0.41 

7.  7 

0.41 

0.60 

0.47 

0.47 

0.16 

0.15 

0.18 

0.42 

0.40 

0.74 

0.26 

0.36 

0.38 

8.  8 

0.40 

0.56 

0.36 

0.34 

0.04 

0.08 

0.06 

0.41 

0.69 

0.61 

0.19 

0.36 

0.34 

9.  9 

0.24 

0.37 

0.22 

0.08 

-0.09 

-0.01 

-0.08 

0.18 

0.37 

0.34 

0.02 

0.18 

0.15 

10.10 

-0.01 

0.08 

-0.03 

-0.14 

-0.20 

-0.11 

-0.18 

-0.07 

-0.03 

-0.04 

-0.14 

-0.07 

-0.08 

|    7.  2.  9 

-0.13 

-0.20 

-0.17 

-0.23 

-0.38 

-0.60 

-0.47 

-0.34 

-0.51 

-0.26 

-0.06 

-0.06 

-0.29 

6.  2.  8 

-0.14 

-0.25  -0.15 

-0.20  -0.30 

-0.53 

-0.39 

-0.33 

-0.19 

-0.23 

-0.01 

-0.06 

-0.23 

!    6.  2.10 

-0.08 

-0.07     0.01 

0.07     0.10 

0.04 

0.09 

0.10 

0.09 

-0.05 

0.03 

-0.01 

0.03 

1    6.  2.  6 

-0.27 

-0.47 

-0.41 

-0.63 

-0.80 

-1.25 

-0.99 

-0.90 

-0.71 

-0.55 

-o.os 

-0.15 

-0.60 

!    7.  2 

-0.33 

-0.51 

-0.48 

-0.77 

-0.86 

-1.41 

-1.11 

-0.87 

-1.26 

-0.75 

-0.22 

-0.26 

-0.74 

oj*     *5 

-0.45 

-0.70  -0.76 

-1.18  -1.36 

-2.02 

-1.67 

-1.30 

-1.34-1.08 

-0.37 

-0.32 

-1.05 

8.  1 

-0.48  -0.70  -0.74 

-1.11  -1.28 

-1.88 

-1.59  -1.22 

-1.33 

-0.99 

-0.46 

-0.35 

-1.01 

7.   1 

-0.36 

-0.51 

-0.46 

-0.70 

-0.78 

-1.27 

-1.03 

-0.78 

-1.25 

-0.66 

-0.31 

-0.28 

-0.70 

9.12.3.9 

-0.54 

-0.84 

-0.81 

-1.28 

-1.38 

-1.88 

-1.62 

-1.48 

-1.41 

-1.09 

-0.43 

-0.38 

-1.10 

7.  2.2(9) 

-0.03 

-0.05  -0.02 

-0.12 

-0.14 

-0.20 

-0.15 

-0.08 

-0.13 

-0.02 

0.02 

0.03 

-0.07 

Dail.ext. 

-0.34 

-0.44  '-0.23 

-0.10 

0.09 

0.01 

0.04 

-0.16 

-0.13 

-0.47 

-0.21 

-0.24 

-0.22 

E 


The  numbers  without  siirn  must  he  added  ;  those  with  the  si<m  —  must  be  subtracted. 

59 


HOLLAND.  —  UTRECHT. 


.    LI. 
Lat.  52°  5'  N. 


Long.  5°  8'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour.        .Ian. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn. 

0.36 

0.62 

.13 

1.71 

2.56 

2.74 

2.64 

1.87 

1.91 

1.07 

0.76 

0.11 

1.44 

1 

0.37 

0.74 

.18 

1.87 

2.86 

3.29 

2.67 

1.91 

2.10 

1.11 

0.70 

0.19 

1.58 

2 

0.46 

0.82 

.24 

2.00 

3.00 

3.21 

2.82 

2.02 

2.21 

1.18 

0.78 

0.32 

1.67 

3 

0.51 

0.87 

.27 

2.10 

3.02 

3.25 

2.97 

2.07 

2.34 

1.25 

0.82 

0.42 

1.74 

4 

0.57 

0.90 

.31 

2.16 

2.70 

2.84 

2.76 

2.06 

2.45 

1.31 

0.82 

0.44 

1.69 

5 

0.61 

0.97 

.26 

1.92 

1.80 

1.82 

1.86 

1.80 

2.42 

1.42 

0.90 

0.50 

1.44 

6 

0.66 

0.98 

1.02 

1.30 

0.67 

0.44 

0.33 

1.05 

1.87 

1.22 

0.91 

0.46 

0.91 

7 

0.64 

0.84 

0.62 

0.37 

-0.38 

-0.70 

-0.77 

0.04 

0.72 

0.39 

0.78 

0.38 

0.24 

8 

0.50 

0.56 

-0.01 

-0.40 

-1.17 

-1.50 

-1.28 

-0.68 

-0.39 

0.12 

0.29 

0.31 

-0.30 

9 

0.13 

-0.07 

-0.53 

-1.20 

-1.68 

-2.02 

-1.69 

-1.33 

-1.12 

-0.50 

-0.22 

0.14   -0.84 

10 

-0.26 

-0.49 

-1.05 

-1.71 

-2.06 

-2.42 

-2.02 

-1.65 

-1.79 

-1.12 

-0.71 

-0.14   -1.29 

11 

-0.62 

-0.97 

-1.50 

-2.16 

-2.46 

-2.78 

-2.27 

-1.87 

-2.34 

-1.68 

-1.15 

-0.:;3 

-1.68 

Noon. 

-0.85 

-1.34 

-1.77 

-2.41 

-2.78 

-2.94 

-2.53 

-2.16 

-2.83 

-1.98 

-1.49 

-0.62 

-1.97 

1 

-0.98 

-1.58 

-1.88 

-2.42 

-2.94 

-3.00 

-2.61 

-2.40 

-3.07 

-2.11 

-1.62 

-0.75 

-2.11 

2 

-1.02 

-1.54 

-1.82 

-2.42 

-2.88 

-2.94 

-2.60 

-2.30 

-2.99 

-1.99 

-1.43  -O.C6  1-2.05 

3 

-0.81 

-1.21 

-1.54 

-2.24 

-2.58 

-2.64 

-1.58 

-2.13 

-2.68 

-1.64 

-1.081-0.47 

-1.72 

4 

-0.60 

-0.89 

-1.25 

-1.82 

-2.06 

-2.20 

-2.00 

-1.79-2.06 

-1.10 

-0.70  |-0.23 

-1.39 

5 

-0.35 

-0.48 

-0.75 

-1.23 

-1.42 

-1.53 

-1.62 

-1.30 

-1.34 

-0.52 

-0.42 

-0.17 

-0.93 

6 

-0.19 

-0.21 

-0.24 

-0.47 

-0.76 

-0.74 

-0.76 

-0.61 

-0.52 

-0.11 

-0.18 

-0.10 

-0.41 

7 

-0.05 

-0.03 

0.14 

0.20 

0.07 

0.17 

0.02 

0.14 

0.10 

0.22 

-0.02 

-0.03 

0.06 

8 

0.05 

0.12 

0.48 

0.72 

0.85 

1.01 

0.82 

0.86 

0.62 

0.53 

0.18 

0.02 

0.52 

9 

0.22 

0.23 

0.74 

1.13 

1.51 

1.77 

1.50 

1.24 

1.17 

0.84 

0.40 

0.06 

0.90 

10 

0.36 

0.40 

0.94 

1.41 

1.92 

2.25 

1.96 

1.52 

1.51 

1.01 

0.58 

0.04 

1.16 

11 

0.36 

0.67 

1.02 

1.58 

2.16 

2.53 

2.17 

1.70 

1.76 

1.14 

1.06 

0.02 

1.35 

Mean  . 

-2.83 

4.18 

3.20 

7.14 

10.55 

12.95 

13.75    12.90 

10.87 

6.88 

4.65 

0.76 

LIT. 

ENGLAND.  —  GREENWICH.     Lat.  51°  28'  38"  N.     Long.  0°  0'.—  DOVE. 

Degrees  of  Reaumur.    . 

Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct.        Nov. 

Dec. 

!  Year. 

A.M.I 

0.44 

0.75 

1.44 

2.32 

2.72 

3.24 

2.73 

2.49 

2.05 

1.34      0.67 

0.47 

|     1.72 

3 

0.62 

0.94 

1.66 

2.66 

3.04 

3.70 

3.11 

2.82 

2.40 

1.42      0.80 

0.56 

1.98 

5 

0.75 

1.06 

1.92 

2.84 

2.84 

3.25 

2.91 

2.89 

2.58 

1.54      0.87 

0.56 

I    2.00 

7 

0.86 

1.03 

1.60 

1.31 

0.75 

0.80 

0.88 

1.22 

1.65 

1.26     0.88 

0.60 

1.07 

9 

0.41 

0.24 

-0.22 

-0.82 

-1.30 

-1.52 

-1.14 

-1.14 

-0.76 

-0.30     0.11 

0.24 

.-0.50 

11 

-0.74 

-1.03 

-1.90 

-2.48 

-2.60 

-2.91 

-2.67 

-2.64 

-2.57 

-1.88 

-1.06 

-0.73 

-1.93 

P.M.  1 

-1.25 

-1.73 

-2.62 

-3.31 

-3.36 

-3.75 

-3.17 

-3.40 

-3.28 

-2.40 

-1.64 

-1.20 

-2.59 

3 

-1.10 

-1.59 

-2.43  -3.08 

-3.02 

-3.60 

-3.09 

-3.20-2.94 

-2.04  -1.26 

-0.85 

-2.35 

5 

-0.36 

-0.63 

-1.33  -2.04  -2.05 

-2.51 

-2.24 

-2.11  -1.65 

-0.73 

-0.38 

-0.24 

-1.37 

7 

0.03 

0.05 

0.09 

-0.16 

-0.29 

-0.58 

-0.50 

-0.11 

0.04 

0.11 

0.09 

0.00 

-0.10 

9 

0.10 

0.32 

0.71 

0.99 

1.20 

1.40 

1.13 

1.22 

0.89 

0.63 

0.40 

0.21 

0.77 

11 

0.23 

I 

0.54 

1.11 

1.77 

2.06 

2.52 

2.08 

1.96 

1.60 

'    1.07 

0.53 

0.37 

1.33 

Mean.  II  2.48 

2.53 

4.53 

6.71 

9.62 

12.47 

13.08 

12.98 

11.12 

7.71 

5.47 

3-09 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

60 


LIII. 
ENGLAND.  —  GREENWICH.     Lat.  51°  29'  N.     Long.  0°  0'. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.38 

0.68 

.29 

2.21 

2.72 

3.13 

2.61 

2.61 

1.89 

.28 

0.60 

0.40 

1.65 

2 

0.63 

0.82 

.44 

.2.31 

2.85 

3.30 

2.71 

2.68 

2.06 

.45 

0.75 

0.52 

1.79 

3 

0.83 

0.95 

.62 

2.44 

2.91 

3.41 

2.74 

2.78 

2.22 

.56 

0.88 

0.59 

1.91 

4 

0.93 

1.02 

.82 

2.54 

2.85 

3.40 

2.71 

2.86 

2.34 

.60 

0.95 

0.62 

1.97 

5 

0.93 

1.03 

.95 

2.46 

2.60 

3.14 

2.53 

2.81 

2.35 

.56 

0.95 

0.62 

1.91 

6 

0.84 

0.97 

.93 

2.17 

2.08 

2.52 

2.11 

2.48 

2.15 

.42 

0.89 

0.60 

1.68 

7 

0.71 

0.84 

.66 

1.56 

1.25 

1.53 

1.38 

1.77 

1.67 

.15 

0.75 

0.57 

1.24 

8 

0.53 

0.61 

.11 

0.66 

0.20 

0.28 

0.40 

0.72 

0.88 

0.71 

0.52 

0.48 

0.59 

9 

0.30 

0.26 

0.30 

-0.37 

-0.92 

-1.02 

-0.71 

-0.55 

-0.13 

0.09 

0.19 

0.28 

-0.19 

10 

-0.01 

-0.20 

-0.66 

-1.43 

-1.94 

-2.12 

-1.73 

-1.78 

-1.23 

-0.66 

-0.26 

-0.04 

-1.01 

11 

-0.39 

-0.75 

-1.60 

-2.30 

-2.70 

-2.89 

-2.51 

-2.79 

-2.22 

-1.43 

-0.77 

-0.46 

-1.73 

Noon.  .  . 

-0.79 

-1.27 

-2.35 

-2.87 

-3.13 

-3.28 

-2.94 

-3.43 

-2.94 

-2.07 

-1.25 

-0.87 

-2.27 

1 

-1.12 

-1.66 

-2.79 

-3.17 

-3.26 

-3.39 

-3.04 

-3.69 

-3.28 

-2.45 

-1.59 

-1.17 

-2.55 

2 

-1.28 

-1.81 

-2.85 

-3.14 

-3.16 

-3.34 

-2.91 

-3.63 

-3.23 

-2.48 

-1.69 

-1.25 

-2.56 

3 

-1.21 

-1.67 

-2.57 

-2.92 

-2.90 

-3.21 

-2.67 

-3.34 

-2.86 

-2.17 

-1.51 

-1.10 

-2.34 

4 

-0.95 

-1.29 

-2.05 

-2.54 

-2.54 

-3.01 

-2.38 

-2.89 

-2.28 

-1.63 

-1.10 

-0.76 

-1.95 

5 

-0.58 

-0.78 

-1.40 

-1.97 

-2.06 

-2.67 

-2.30 

-2.30 

-1.60 

-1.01 

-0.59 

-0.36 

-1.45 

6 

-0.22 

-0.26 

-0.75 

-1.34 

-1.45 

-2.10 

-1.57 

-1.56 

-0.91 

-0.43 

-0.10 

-0.01 

-0.89 

7 

0.03 

0.14 

-0.17 

-0.60 

-0.71 

-1.26 

-0.96 

-0.69 

-0.27 

0.02 

0.24 

0.20 

-0.34 

8 

0.11 

0.37 

0.30 

0.17 

0.11 

-0.24 

-0.19 

0.24 

0.29 

0.32 

0.41 

0.26 

0.18 

9 

0.08 

0.46 

0.65 

0.84 

0.92 

0.81 

0.64 

1.11 

0.77 

0.52 

0.44 

0.23 

0.62 

10 

0.03 

0.48 

0.89 

1.42 

1.62 

1.74 

1.41 

1.81 

1.17 

0.69 

0.41 

0.19 

0.99 

11 

0.04 

0.49 

1.05 

1.81 

2.16 

2.42 

2.01 

2.27 

1.47 

0.87 

0.40 

0.20 

1.27 

Midn.  .  . 

0.16 

0.56 

1.17 

2.03 

2.51 

2.86 

2.40 

2.51 

1.70 

1.08 

0.46 

0.28 

1.48 

6.  6 

0.31 

0.36 

0.59 

0.42 

0.31 

0.21 

0.27 

0.46 

0.62 

0.50 

0.39 

0.30 

0.40 

7.  7 

0.37 

0.49 

0.75 

0.48 

0.27 

0.13 

0.21 

0.54 

0.70 

0.59 

0.50 

0.38 

0.45 

8.  8 

0.32 

0.49 

0.71 

0.42 

0.16 

0.02 

0.10 

0.48 

0.59 

0.52 

0.47 

0.37 

0.39 

9.  9 

0.19 

0,36 

0.48 

0.24 

0.00 

-0.10 

-0.04 

0.28 

0.32 

0.31 

0.31 

0.25 

0.22 

10.10 

0.01 

0.14 

0.12 

-0.00 

-0.16 

-0.19 

-0.16 

0.01 

-0.03 

0.02 

0.08 

0.07 

-0.01 

7.  2.  9 

-0.16 

-0.17 

-0.18 

-0.25 

-0.33 

-0.33 

-0.30 

-0.25 

-0.26 

-0.27 

-0.17 

-0.15 

-0.24 

6.  2.  8 

-0.11 

-0.16-0.21 

-0.27 

-0.32 

-0.35 

-0.33 

-0.30 

-0.26 

-0.25 

-0.13 

-0.13 

-0.24 

6.  2.10 

-0.14 

-0.12 

-0.01 

0.15 

0.18 

0.31 

-0.20 

0.22 

0.03 

-0.12 

-0.13 

-0.15 

0.04 

6.  2.  6 

-0.22 

-0.37 

-0.56 

-0.77 

-0.84 

-0.97 

-0.79 

-0.90 

-0.66 

-0.50 

-0.30 

-0.22 

-0.59 

7.  2 

-0.29 

-0.49 

-0.60 

-0.79 

-0.96 

-0.91 

-0.77 

-0.93 

-0.78 

-0.67 

-0.47 

-0.34 

-0.67 

8.  2 

-0.38 

-0.60 

-0.87 

-1.24 

-1.48 

-1.53 

-1.26 

-1.46 

-1.18 

-0.89 

-0.59 

-0.39 

-0.99 

8.  1 

-0.30 

-0.53 

-0.84 

-1.26 

-1.53 

-1.56 

-1.31 

-1.49 

-1.20 

-0.87 

-0.54 

-0.35 

-0.98 

7.  1 

-0.21 

-0.41 

-0.57 

-0.81 

-1.01 

-0.93 

-0.83 

-0.96 

-0.81 

-0.65 

-0.42 

-0.30 

-0.66 

9.12.3.9 

-0.41 

-0.56 

-0.99 

-1.33 

-1.51 

-1.68 

-1.42 

-1.55 

-1.29 

-0.91 

-0.53 

-0.37 

-1.05 

7.  2.2(9) 

-0.10 

-0.01 

0.03 

0.03 

-0.02 

-0.05 

-0.06 

0.09 

-0.01 

-0.07 

-0.02 

-0.06 

-0.02 

Dail.  ext. 

-0.18 

-0.39 

-0.45 

-0.32 

-0.18 

0.01 

-0.15 

-0.42 

-0.47 

-0.44 

-0.37 

-0.32 

-0.30 

The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

61 


LIV. 
ENGLAND.  —  GREENWICH.     Lat.  51°  29'  N.     Long.  0°  0'. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Moan  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  GLAISHER. 

Degrees  of  Fahrenheit. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Midn.  .  . 

1.0 

1.6 

2.9 

4.8 

5.4 

6.2 

5.0 

5.1 

4.0 

2.9 

1.7 

0.9 

3.5 

1 

0.9 

1.8 

3.0 

5.2 

6.0 

7.1 

5.5 

5.5 

4.5 

3.0 

l.S 

1.0 

3.8 

2 

1.2 

2.0 

3.3 

5.7 

6.4 

8.0 

6.0 

6.0 

5.5 

3.4 

2.0 

.2 

4.2 

3 

1.3 

2.1 

3.6 

6.2 

6.7 

8.7 

6.4 

6.3 

6.4 

3.6 

2.0 

.3 

4.5 

4 

.6 

2.3 

3.9 

6.6 

6.7 

9.3 

6.6 

6.5 

6.6 

3.8 

2.1 

.4 

4.8 

5 

.8 

2.2 

4.0 

6.7 

6.3 

8.8 

6.2 

6.5 

6.2 

3.8 

2.0 

.4 

4.7 

6 

.9 

2.3 

3.9 

6.0 

4.8 

6.4 

4.5 

5.5 

5.3 

3.5 

1.9 

.4 

3.9 

7 

.9 

2.1 

3.6 

4.3 

2.6 

3.0 

2.5 

3.3 

4.0 

2.8 

1.7 

.5 

2.8 

8 

.5 

1.6 

2.5 

2.0 

0.5 

0.0 

0.0 

0.9 

2.1 

1.6 

1.0 

1.3 

1.2 

9 

.0 

0.7 

0.2 

-0.9 

-2.0 

-2.5 

-2.0 

-1.6 

-0.4 

0.0 

0.4 

0.9 

-0.5 

10 

0.2 

-0.5 

-1.9 

-3.2 

-4.0 

-4.5 

-4.0 

-3.5 

-3.0 

-2.0 

-0.6 

0.0 

-2.2 

11 

-1.3 

-2.1 

-3.5 

-5.3 

-5.5 

-5.8 

-5.4 

-5.4 

-5.0 

-3.8 

-2.0 

-1.3 

-3.9 

Noon.  .  . 

-2.3 

-3.2 

-5.0 

-6.8 

-6.7 

-7.3 

-6.4 

-6.5 

-6.4 

-5.1 

-3.1 

-2.1 

-5.1 

1 

-2.9 

-3.9 

-5.8 

-7.9 

-7.5 

-8.1 

-6.7 

-7.5 

-7.1 

-5.5 

-3.5 

-2.4 

-5.7 

2 

-3.0 

-3.9 

-5.8 

-8.2 

-7.7 

-8.6 

-6.7 

-7.7 

-7.1 

-4.9 

-3.6 

-2.3 

-5.8 

3 

-2.5 

-3.6 

-5.5 

-7.7 

-7.3 

-8.4 

-6.5 

-7.0 

-6.6 

-3.7 

-3.0 

-1.9 

-5.3 

4 

-1.9 

-2.8 

-4.5 

-6.7 

-6.1 

-7.4 

-5.8 

-5.5 

-5.5 

-2.8 

-2.1 

-1.3 

-4.4 

5 

-1.1 

-1.6 

-3.3 

-5.4 

-4.8 

-6.1 

-4.9 

-3.6 

-4.2 

-1.7 

-1.2 

-0.8 

-3.2 

6 

-0.6 

-0.6 

-1.8 

-3.5 

-3.0 

-4.5 

-3.5 

-2.0 

-2.5 

-0.8 

-0.4 

-0.4 

-2.0 

7 

-0.3 

0.3 

-0.4 

-1.1 

-1.0 

-2.4 

-1.5 

-0.5 

-0.6 

0.0 

0.1 

-0.1 

-0.6 

8 

0.1 

0.6 

0.9 

0.7 

0.9 

0.0 

0.3 

1.0 

1.0 

0.7 

0.6 

0.2 

0.6 

9 

0.4 

1.0 

1.7 

2.0 

2.3 

1.8 

1.9 

2.4 

1.8 

1.3 

1.0 

0.4 

1.5 

10 

0.6 

1.3 

2.3 

3.2 

3.5 

3.6 

3\3 

3.3 

2.7 

1.9 

1.3 

0.5 

2.3 

11 

0.7 

1.5 

2.6 

4.1 

4.5 

5.0 

4.2 

4.3 

3.4 

2.4 

1.5 

0.8 

2.9 

6.  6 

0.6 

0.9 

1.0 

1.2 

0.9 

0.9 

0.5 

1.7 

1.4 

1.3 

0.8 

0.5 

0.9 

7.  7 

0.8 

1.2 

1.6 

1.6 

0.8 

0.3 

0.5 

1.4 

1.7 

1.4 

0.9 

0.7 

1.1 

81.  8 

0.8 

1.1 

1.7 

1.3 

0.7 

0.0 

0.1 

0.9 

1.5 

1.1 

0.8 

0.8 

0.9 

9.  9 

0.7 

0.8 

0.9 

0.5 

0.1 

-0.3 

-0.0 

0.4 

0.7 

0.6 

0.7 

0.6 

0.5 

10.10 

0.4 

0.4 

0.2 

0.0 

-0.2 

-0.4 

-0.4 

-0.1 

-0.1 

-0.0 

0.4 

0.2 

0.0 

7.  2.  9 

-0.2 

-0.3 

-0.2 

-0.6 

-0.9 

-1.2 

-0.8 

-0.7 

-0.4 

-0.2 

-0.3 

-0.1 

-0.5 

6.  2.  8 

-0.3 

-0.3 

-0.3 

-0.5 

-0.7 

-0.7 

-0.6 

-0.4 

-0.3 

-0.2 

-0.4 

-0.2 

-0.4 

6.  2.10 

-0.2 

-0.1 

0.1 

0.3 

0.2 

0.5 

0.4 

0.3 

0.3 

0.2 

-0.1 

-0.1 

0.1 

6.  2.  6 

-0.6 

-0.7 

-1.2 

-1.9 

-1.9 

-2.2 

-1.9 

-1.4 

-1.4 

-0.7 

-0.7 

-0.4 

-1.3 

7.  2 

-0.5 

-0.9 

-1.1 

-1.9 

-2.5 

-2.8 

-2.1 

-2.2 

-1.5 

-1.0 

-0.9 

-0.4 

-1.5 

8.  2 

-0.7 

-1.1 

-1.6 

-3.1 

-3.6 

-4.3 

-3.3 

-3.4 

-2.5 

-1.7 

-1.3 

-0.5 

-2.3 

8.  1 

-0.7 

-1.1 

-1.6 

-2.9 

-3.5 

-4.0 

-3.4 

-3.3 

-2.5 

-1.9 

-1.3 

-0.5 

-2.2 

7.   1 

-0.5 

-0.9 

-1.1 

-1.8 

-2.4 

-2.6 

-2.1 

-2.1 

-1.5 

-1.4 

-0.9 

-0.4 

-1.5 

9.12.3.9 

-0.8 

-1.3 

-2.1 

-3.3 

-3.4 

-4.1 

-3.2 

-3.2 

-2.9 

-1.9 

-1.2 

-0.7 

-2,4 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

62 


LV. 

PRUSSIA.  —  HALLE.     Lat.  51°  30'  N.     Long.  11°  57'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

! 

Feb. 

March 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec.      Mean. 

Morn.  1 

0.53 

1.00 

1.36 

2.52 

3.98 

3.91 

3.72 

3.32 

2.70 

2.01 

0.95 

0.46 

2.21 

2 

0.56 

1.14 

1.58 

2.86 

4.10 

3.94 

3.82 

3.57 

2.99 

2.22 

0.97 

0.48 

2.35 

3 

0.60 

1.26 

1.74 

3.00 

3.78 

3.62 

3.56 

3.56 

3.12 

2.37 

1.01 

0.50 

2.34 

4 

0.66 

1.34 

1.82 

2.94 

3.10 

2.95 

2.97 

3.27 

3.02 

2.41 

1.03 

0.54 

2.17 

5 

0.72 

1.36 

1.72 

2.62 

2.18 

2.09 

2.14 

2.64 

2.62 

2.25 

1.00 

0.55 

1.82 

6 

0.72 

1.30 

1.42 

1.98 

1.30 

1.18 

1.24 

1.90 

1.97 

1.90 

0.92 

0.58 

1.37 

7 

0.65 

1.10 

0.94 

1.07 

0.32 

0.25 

0.23 

0.84 

0.98 

i:32 

0.74 

0.55 

0.75 

8 

0.36 

0.53 

0.20 

0.03 

-0.56 

-0.58 

-0.57 

-0.20 

0.12 

0.33 

0.30 

0.28 

0.02 

9 

0.05 

-0.08 

-0.66 

-0.98 

-1.34 

-1.34 

-1.30 

-1.20 

-1.14 

-0.71 

-0.31 

-0.09 

-0.76 

10 

-0.45 

-0.76 

-1.18 

-1.86 

-2.09  -2.01 

-1.99 

-2.10  -2.03 

-1.66 

-0.87 

-0.54 

-1.46 

11 

-0.82  -1.29 

-1.73  -2.58 

-2.66 

-2.68 

-2.65 

-2.90 

-2.72 

-2.44 

-1.35 

-0.90 

-2.06 

Noon.  .  . 

-1.09  -1.77 

-2.06 

-3.08 

-3.14 

-3.07 

-3.16 

-3.35 

-3.11 

-2.86 

-1.66 

-1.08 

-2.45 

1 

-1.17 

-2.02 

-2.22 

-3.32 

-3.33 

-3.35 

-3.46 

-3.53 

-3.30 

-3.01 

-1.73 

-1.09 

-2.63 

2 

-1.06  -1.86  -2.10  -3.26 

-3.37  -3.46 

-3.54 

-3.57 

-3.27 

-2.76 

-1.52 

-0.94 

-2.56 

3 

-0.86  -1.49 

-1.86  -2.90 

-3.13  -3.23 

-3.29  -3.30-2.98 

-2.32 

-1.14 

-0.74 

-2.27 

4 

-0.53 

-1.01 

-1.42 

-2.39 

-2.74 

-2.74 

-2.76 

-2.84 

-2.50 

-1.81 

-0.75 

-0.42 

-1.83 

5 

-0.30 

-0.59 

-0.91 

-1.78 

-2.24 

-2.22 

-2.16 

-1.97 

-1.83 

-1.20 

-0.40 

-0.20 

-1.32 

6 

-0.13 

-0.29 

-0.52 

-0.96 

-1.58 

-1.50 

-1.39 

-1.38 

-1.12 

-0.69 

-0.14 

-0.03 

-0.81 

7 

-0.00 

-0.09 

-0.06 

-0.34 

-0.86 

-0.73 

-0.55 

-0.59 

-0.38 

-0.21 

0.04 

0.09 

-0.31 

8 

0.11 

0.13 

0.26 

0.32 

-0.10 

0.07 

0.26 

0.15 

0.29 

0.25 

0.21 

0.22 

-0.18 

9 

0.21 

0.30 

0.59 

0.88 

0.68 

0.90 

1.09 

0.90 

0.87 

0.68 

0.39 

0.34 

0.65 

10 

0.31 

0.46 

0.79 

1.33 

1.64 

1.81 

1.87 

1.61 

1.42 

1.12 

0.59 

0.37 

1.11 

11 

0.41 

0.65 

0.98 

1.78 

2.61 

2.69 

2.64 

2.30 

1.90 

1.47 

0.76 

0.40 

1.55 

Midn.  .  . 

0.48 

0.83 

1.16 

2.17 

3.43 

3.42 

3.29 

2.86 

2.33 

1.77 

0.89 

0.43 

1.92 

6.  6 

0.21 

0.39 

0.41 

0.42 

-0.03 

-0.07 

-0.01 

0.34 

0.40 

0.53 

0.30 

0.18 

0.26 

7.  7 

0.30 

0.51 

0.45 

0.51 

-0.14 

-0.16  -0.08 

0.26 

0.43 

0.61 

0.39 

0.28 

0.28  i 

8.  8      j     0.33 

0.51 

0.44 

0.37 

-0.27 

-0.24 

-0.16 

0.13 

0.30 

0.56 

0.39 

0.32 

0.22 

9.  9 

0.24 

0.33 

0.23 

0.18 

-0.33 

-0.26 

-0.16 

-0.03 

0.21 

0.29 

0.26 

0.25 

0.10 

10.10 

0.13 

0.11 

-0.04 

-0.05 

-0.33 

-0.22 

-0.11 

-0.15 

-0.14 

-0.02 

0.04 

0.13 

-0.05 

7.  2.  9 

-0.11 

-0.20 

-0.18 

-0.34 

-0.71 

-0.70 

-0.65 

-0.49 

-0.35 

-0.29 

-0.20 

-0.10 

-0.3G 

6.  2.  8       -0.15  -0.25  -0.19 

-0.35 

-0.67 

-0.66 

-0.62  -0.49 

-0.35  -0.32 

-0.23 

-0.15-0.37  I 

6.  2.10       -0.08  -0.12 

0.03 

0.06 

-0.16 

-0.12 

-0.08 

-0.00 

0.06  -0.03 

-0.11 

-0.07i-0.05 

6.  2.  6 

-0.25 

-0.42 

-0.47 

-0.83 

-1.13 

-1.16 

-1.16 

-0.95 

-0.84 

-0.65 

-0.38 

-0.25 

-0.71  : 

7.  2 

-0.23 

-0.36 

-0.40 

-0.67 

-1.02 

-1.09 

-1.11 

-0.82 

-0.67 

-0.56 

-0.41 

-0.26 

-0.63 

8.  2 

-0.26  -0.46 

-0.64 

-1.13 

-1.51 

-1.55 

-1.62 

-1.35 

-1.16 

-0.85 

-0.50 

-0.27  -0.94 

8.  1 

-0.22  -0.34 

-0.56 

-1.01 

-1.41 

-1.41 

-1.47 

-1.26 

-1.07 

-0.77 

-0.46 

-0.27 

-0.85 

7.  1 

-0.19 

-0.24 

-0.32 

-0.55 

-0.92 

-0.95 

-0.96 

-0.73 

-0.57 

-0.48 

-0.37 

-0.25 

-0.54 

9.12.3.9     | 

-0.35 

-0.62 

-0.84 

-1.37 

-1.67 

-1.66 

-1.63 

-1.63 

-1.40 

-1.16 

-0.59 

-0.34 

-1.10 

7.     2.2(9)    ; 

-0.06 

-0.12 

-0.07 

-0.18 

-0.56 

-0.51 

-0.43 

-0.33 

-0.19 

-0.15 

-0.10 

-0.02 

-0.23    . 

Dail.ext.     -0.23  -0.33  -0.20 

-0.16 

0.37 

0.24 

0.14 

0.00 

-0.09 

-0.30 

-0.35 

-0.26-0.14  ! 

The  numbera  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

63 


HANOVER.  —  GOTTINGEN. 


LVI. 
Lat.  51°32'N. 


Long.  9°  56'  E.  Grcenw. 
Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  -the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec.      Mean. 

1 

Morn.  1 

0.90 

1.13 

1.58 

2.24 

3.31 

3.43 

3.56 

3.35 

2.31 

1.58 

0.69 

0.60 

2.06 

2 

0.92 

.14 

1.77 

2.49 

3.70 

3.71 

3.82 

3.70 

2.68 

1.75 

0.74 

0.59 

2.25 

3 

0.94 

.16 

2.01 

2.79 

3.93 

3.73 

3.92 

3.92 

3.23 

1.94 

0.82 

0.58 

2.41 

4 

0.99 

.20 

2.22 

3.04 

3.91 

3.57 

3.79 

3.89 

3.63 

2.10 

0.92 

0.58 

2.49 

5 

1.15 

.26 

2.29 

3.08 

3.55 

3.10 

3.36 

3.52 

3.62 

2.15 

1.00 

0.62 

2.39 

6 

1.12 

.20 

2.10 

2.73 

2.62 

2.22 

2.59 

2.79 

3.50 

1.99 

1.08 

0.66 

2.05 

7 

1.13 

.14 

1.77 

2.24 

1.78 

1.21 

1.40 

1.69 

2.62 

1.58 

0.94 

0.65 

1.51 

8 

1.12 

0.80 

1.02 

0.89 

0.75 

0.49 

0.48 

0.56 

1.36 

1.08 

0.53 

0.54 

0.80 

9 

0.50 

-0.08 

-0.14 

-0.16 

-0.47 

-0.55 

-0.65 

-0.68 

-0.22 

-0.21 

0.10 

0.30 

-0.19 

10 

-0.37 

-0.88 

-1.09 

-1.32 

-1.53 

-1.60 

-2.22 

-1.84 

-1.45 

-0.82 

-0.42 

-0.02 

-1.13 

11 

-1.26 

-1.78 

-1.87 

-2.30 

-2.59 

-2.53 

-2.74 

-2.83 

-2.45 

-1.74 

-0.99 

-0.74 

-1.99 

Noon.  .  . 

-1.83 

-2.17 

-2.43 

-2.98 

-3.30 

-3.19 

-3.48 

-3.52 

-3.37 

-2.50 

-1.46 

-1.12 

-2.61 

1 

-2.02 

-2.32 

-2.81 

-3.37 

-3.82 

-3.72 

-3.78 

-3.82 

-3.80 

-2.89 

-1.58 

-1.42 

-2.95 

2 

-2.03 

-2.23 

-3.05 

-3.56 

-3.98 

-4.03 

-4.09 

-4.15 

-4.00 

-2.98 

-1.60 

-1.28 

-3.08 

3 

-1.74 

-1.98 

-2.88 

-3.48 

-395 

-3.91 

-4.00 

-4.03 

-4.03 

-2.84 

-1.32 

-1.02 

-2.93 

4 

-1.23 

-1.35 

-2.48 

-3.24 

-3.67 

-3.65 

-3.82 

-3.71 

-3.62 

-2.40 

-0.90 

-0.66 

-2.56 

5 

-0.79 

-0.59 

-1.79 

-2.64 

-3.13 

-3.09 

-3.18 

-3.15 

-2.94 

-1.74 

-0.54 

-0.36 

-2.00 

6 

-0.33 

-0.04 

-1.06 

-1.86 

-2.40 

-2.20 

-2.40 

-2.32 

-1.97 

-0.94 

-0.23 

-0.14 

-1.32 

7 

-0.05 

0.31 

-0.26 

-0.80 

-1.44 

-1.16 

-1.30 

-1.09 

-0.87 

-0.30 

0.01 

0.06 

-0.57 

8 

0.24 

0.58 

0.34 

0.04 

0.22 

-0.15 

0.03 

0.13 

0.05 

0.24 

0.17 

0.20 

0.14 

9 

0.40 

0.82 

0.78 

0.77 

0.88 

0.79 

1.09 

1.05 

0.78 

0.71 

0.30 

0.30 

0.72 

10 

0.57 

0.94 

1.05 

1.30 

1.59 

1.73 

1.87 

1.62 

1.28 

1.02 

0.42 

0.40 

1.15 

11 

0.71 

1.01 

1.30 

1.75 

2.29 

2.69 

2.62 

2.26 

1.71 

1.35 

0.56 

0.44 

1.56 

Midn.  .  . 

0.88 

1.07 

1.54 

2.11 

2.52 

3.01 

3.18 

2.93 

2.00 

1.44 

0.62 

0.56 

1.22 

6.  6 

0.40 

0.58 

0.52 

0.44 

0.11 

0.01 

0.10 

0.24 

0.77 

0.53 

0.43 

0.26 

0.37 

7.  7 

0.54 

0.73 

0.76 

0.72 

0.17 

0.03 

0.05 

0.30 

0.88 

0.64 

0.48 

0.36 

0.47 

8.  8 

0.68 

0.69 

0.68 

0.47 

0.27 

0.17 

0.26 

0.35 

0.71 

0.66 

0.35 

0.37 

0.47 

9.  9 

0.45 

0.37 

0.32 

0.31 

0.21 

0.12 

0.22 

0.19 

0.28 

0.25 

0.20 

0.30 

0.27 

10.10 

0.10 

0.03 

-0.02 

-0.01 

0.03 

0.07 

-0.19 

-0.11 

-0.09 

0.10 

-0.00 

0.19 

0.01 

7.  2.  9 

-0.17 

-0.09 

-0.17 

-0.18 

-0.44 

-0.68 

-0.53 

-0.47 

-0.20 

-0.23 

-0.12 

-0.11 

-0.28 

6.  2.  8 

-0.22 

-0.15 

-0.20 

-0-26 

-0.53 

-0.65 

-0.49 

-0.41 

-0.15 

-0.25 

-0.12 

-0.14 

-0.30 

6.  2.10 

-0.11 

-0.03 

0.03 

0.16 

0.08 

-0.03 

0.12 

0.09 

0.26 

0.01 

-0.03 

-0.07 

0.04 

6.  2.  6 

-0.41 

-0.36 

-0.67 

-0.90 

-1.25 

-1.34 

-1.30 

-1.23 

-0.82 

-0.64 

-0.25 

-0.25 

-0.79 

7.  2 

-0.45 

-0.55 

-0.64 

-0.66 

-1.10 

-1.41 

-1.35 

-1.23 

-0.69 

-0.70 

-0.33 

-0.32 

-0.79 

8.  2 

-0.46 

-0.72 

-1.02 

-1.34 

-1.62 

-1.77 

-1.81 

-1.80 

-1.32 

-0.95 

-0.54 

-0.37 

-1.14 

8.  1 

-0.45 

-0.76 

-0.90 

-1.24 

-1.54 

-1.62 

-1.65 

-1.63 

-1.22 

-0.91 

-0.53 

-0.44 

-1.07 

7.  1 

-0.45 

-0.59 

-0.52 

-0.57 

-1.02 

-1.26 

-1.19 

-1.07 

-0.59 

-0.66 

-0.32 

-0.39 

-0.7-2 

9.12.3.9 

-0.67 

-0.85 

-1.17 

-1.46 

-1.71 

-1.72 

-1.76 

-1.80 

-1.71 

-1.21 

-0.60 

-0.39 

-1.25 

7.  2.2(9) 

-003 

0.14 

0.07 

0.06 

-0.11 

-0.31 

-0.13 

-0.09 

0.05 

0.01 

-0.02 

-0.01 

-0.03 

Bail.  ext. 

-0.44 

-0.53 

-0.38 

-0.24 

-0.03 

-0.15 

-0.09 

-0.12 

-0.20 

-0.42 

-0.26 

-0.38 

-0.30 

The  numbers  without  sign  must  be  added  ;  those  with  the  sign  — must  be  subtracted. 

64 


LVII. 

PRUSSIA.  —  BERLIN.     Lat.  52°  30'  N.     Long.  13°  24'  E.  Grecmv. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Fahrenheit. 


Hour.        ;    Jan. 

Feb. 

March. 

April. 

May. 

June.     July. 

Aug. 

Sept. 

Oct. 

NOT. 

Dec. 

Year. 

Midnight.         Q.34 

0.59 

0.90 

1.78 

2.21 

2.15     1.78 

1.52 

1.50 

0.95 

0.44 

0.34 

1.21 

1              0.43 

0.78 

1.13 

2.22 

3.23 

2.80     2.52 

2.53 

1.99 

1.4S 

0.59 

0.37 

1.67 

2 

!    0.49 

0.97 

1.33 

2.56 

3.83     3.38 

3.06 

3.05 

2.41 

1.95 

0.68 

0.43 

2.02 

3 

0.54 

1.09 

1.64 

2.41 

4.00 

3.46 

3.28 

3.15 

2.76 

2.31 

0.73 

0.46 

2.15 

4 

0.58 

1.25 

1.85 

3.03 

3.77 

3.18 

3.12 

3.40 

2.94 

2.45 

0.79 

0.52 

2.24 

5 

0.65 

1.37 

1.97 

3.05 

3.16 

2.59 

2.67 

3.16 

2.S9 

2.32 

0.84 

0.56 

2.10 

6 

0.73 

1.39 

1.02 

2.69 

3.23 

1.73 

1.92 

2.57 

2.56 

1.52 

0.84     0.71 

1.73 

7 

0.75 

1.18 

1.62 

2.01 

1.43 

0.94 

1.18 

1.83 

2.03 

1.15 

0.65 

0.63 

1.211 

S 

|    0.62 

0.89 

1.14 

0.94 

0.42 

0.41 

0.44 

0.75 

1.03 

0.62 

0.56 

0.60 

0.70 

9             0.41 

0.49     0.44 

-0.17 

-0.65-0.40  -0.35 

-0.36 

-0.09 

-0.04 

0.:;5 

0.38 

0.00 

10             0.19-0.09-0.23-1.03 

-1.47-1.14  -1.15 

-1.27 

-0.81 

-0.81 

-0.09 

0.05 

-0.66 

11           -0.30 

-0.66 

-1.02 

-1.78 

-2.20 

-1.72 

-1.78 

-2.07 

-1.90 

-1.46 

-0.55 

-0.36 

-1.32 

Noon.       ;  -0.55 

-1.16 

-1.44 

-2.37 

-2.65 

-2.17 

-2.26 

-2.64 

-2.49 

-1.87 

-0.95 

-0.69 

-1.77 

1         ;-0.93 

-1.48 

-1.97  -2.S5  -3.00  -2.25  -2.54  -3.06 

-2.96 

-2.14 

-1.26 

-0.86 

-2.11 

2          -1.07 

-1.73  -2.20  -2.98-3.25-2.72  -2.75  -3.17 

-3.16 

-2.23 

-1.27 

-0.96 

-2.29 

3        .,-1.0:3 

-1.67  -2.28 

-3.27 

-3.34 

-2.84 

-2.82 

-3.25 

-3.19 

-2.12 

-1.20 

-0.95 

-2.32 

4 

-0.78 

-1.46  '-2.07 

-3.11 

-3.11 

-2.72 

-2.73 

-3.14 

-3.16 

-1.75 

-0.81 

-0.73 

-2.13 

5 

-0.56-1.07-1.70-2.57 

-2.G9  -2.60  -2.40 

-2.72 

-2.34 

-1.53 

-0.49  -0.48 

-1.76 

G 

-0.33  -0.74  -1.12  -2.05  -2.35  -2.36  -2.16 

—2.2  1 

-1.53 

-0.67 

-0.30  -0.25   -1.36 

7 

—0.22 

-0.46  -0.64 

-1.13-1.55-1.75  -1.44 

-1.22 

-0.82 

-0.63-0.11 

-0.15 

-0.84 

8         1-0.12 

-0.20 

-0.27 

-0.34 

-0.67 

-0.57 

-0.39 

-0.30 

-6.16 

-0.30 

0.05 

-0.02 

-0.27 

9 

0.06  !   0.03 

0.05 

0.40 

0.13 

0.31 

0.38     0.84 

0.86 

-0.08 

0.10 

0.06 

0.22 

10 

0.14 

0.21 

0.39 

0.93 

0.82 

0.96 

1.01 

1.06 

0.98 

0.26 

0.20     0.17 

;    0.59 

11 

0.24 

0.38 

0.65 

1.37 

1.56 

1.53 

1.44 

1.57     1.20 

0.56 

0.3<> 

0.25      0.93 

6,  6 

0.17 

0.32 

0.40 

0.32 

-0.06 

-0.31 

-0.12 

0.19 

0.49 

0.32 

0.27 

0.23 

0.10 

7,  7 

0.27 

0.36 

0.49 

0.44-0.06-0.40 

-0.13 

0.30 

0.60 

0.26 

0.27     0.24 

0.22 

8,  8 

0.25 

0.35 

0.41 

0.30  -0.08  -0.03 

0.03 

0.23 

0.41 

0.16 

0.26 

0.29 

0.13 

9,9 

0.24 

0.26 

0.30 

0.12 

0.21 

-0.05 

0.02 

0.24 

-0.23 

-0.06 

0.23 

0.22 

0.12 

10,  10 

0.17 

0.06 

0.07 

-0.08 

-0.33 

-0.09 

-0.07 

-0.11 

-0.09 

-0.28 

0.06 

0.11 

0.05' 

7,  1 

-0.03  -0.15  -0.17 

-0.42  -0.79  -0.65  -0.6S  -0.61 

-0.46 

-0.49  -0.31  -0.12    -0.42 

7,  2,  9      -0.09  -0.17  -0.18  -0.19  -0.56-0.49  -0.36 

-0.17  -0.26 

-0.39  -0.17-0.0!)    -0.26 

6,  2,  10 

-0.07 

-0.04 

0.04 

0.21 

-0.07 

-0.01 

0.06 

0.15 

0.13 

-0.15-0.08 

-0.03 

-0.07 

Daily  ext. 

-0.16 

-0.17 

-0.16 

-0.11 

0.33 

0.31 

0.23 

0.08 

-0.13 

0.11  -0.22 

-0.13 

0.00 

1 

i 

II 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

65 


LVIII. 

GERMANY.  —  SALZUFLEN.     Lai.  52°  5'  N.     Long.  8°  40'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.00 

1.10 

1.05 

2.11 

2.41 

2.57 

2.05 

1.71 

2.12 

1.24 

0.90 

0.31 

1.46 

.     2 

0.55 

1.22 

1.20 

2.44 

2.93 

2.85 

2.27 

2.01 

2.44 

1.55 

1.26 

0.48 

1.77 

3 

0.60 

1.27 

1.34 

2.64 

3.29 

2.98 

2.39 

2.23 

2.74 

1.82 

1.53 

0.65 

1.96 

4 

0.62 

1.26 

1.38 

2.62 

3.37 

2.86 

2.32 

2.26 

2.87 

1.98 

1.64 

0.78 

2.00 

5 

0.72 

1.18 

1.29 

2.35 

3.08 

2.47 

1.99 

2.00 

2.71 

1.97 

1.58 

0.83 

1.85 

6 

0.62 

1.01 

1.06 

1.80 

2.41 

1.83 

1.42 

1.48 

2.18 

1.75 

1.37 

0.79 

1.48 

7 

0.51 

0.75 

0.70 

1.05 

1.45 

1.02 

0.70 

0.79 

1.34 

1.34 

1.04 

0.64 

0.94 

8 

0.31 

0.41 

0.25 

0.20 

0.38 

0.15 

-0.06 

0.08 

0.30 

0.75 

0.62 

0.38 

0.31 

9 

0.08 

-0.03 

-0.22 

-0.63 

-0.59 

-0.67 

-0.74 

-0.54 

-0.65 

0.09 

0.14 

0.06 

-0.31 

10 

-0.33 

-0.53 

-0.68 

-1.36 

-1.42 

-1.38 

-1.15 

-1.02 

-1.47 

-0.63 

-0.35 

-0.24 

-0.88 

11 

-0.74 

-1.02 

-1.06 

-1.93 

-1.96 

-1.94 

-1.62 

-1.38 

-2.08 

-1.27 

-0.02 

-0.48 

-1.29 

Noon.  .  . 

-0.91 

-1.42 

-1.39 

-2.32 

-2.31 

-2.39 

-1.90 

-1.72 

-2.41 

-1.78 

-1.18 

-0.62 

-1.70 

1 

-1.01 

-1.68 

-1.59 

-2.54 

-2.53 

-2.72 

-2.13 

-2.03 

-2.75 

-2.09 

-1.48 

-0.64 

-1.93 

2 

-0.94 

-1.74 

-1.65 

-2.60 

-2.66 

-2.91 

-2.30 

-2.30 

-2.90 

-2.18 

-1.56 

-0.58 

-2.03 

3 

-0.79 

-1.58 

-1.56 

-2.49 

-2.72 

-2.92 

-2.36 

-2.42 

-2.90 

-2.06 

-1.46 

-0.50 

-1.98 

4 

-0.50 

-1.29 

-1.33 

-2.21 

-2.65 

-2.71 

-2.24 

-2.30 

-2.70 

-1.76 

-1.22 

-0.41 

-1.78 

5 

-0.20 

-0.90 

-0.98 

-1.77 

-2.39 

-2.26 

-1.89 

-1.87 

-2.25 

-1.34 

-0.92 

-0.35 

-1.43 

6 

-0.10 

-0.51 

-0.56 

-1.22 

-1.94 

-1.62 

-1.32 

-1.22 

-1.55 

-0.90 

-0.65 

-0.32 

-0.99 

7 

0.01 

-0.17 

-0.15 

-0.62 

-1.34 

-0.86 

-0.62 

0.47 

-0.71 

-0.47 

-0.44 

-0.30 

-0.51 

8 

0.08 

0.11 

0.19 

-0.04 

-0.65 

-0.09 

0.09 

0.21 

0.12 

-0.11 

-0.31 

-0.27 

-0.06 

9 

0.14 

0.34 

0.45 

0.48 

0.04 

0.62 

0.70 

0.71 

0.81 

0.18 

-0.20 

-0.21 

0.34 

10 

0.21 

0.55 

0.63 

0.94 

0.68 

1.22 

1.26 

1.03 

1.30 

0.42 

-0.06 

-0.12 

0  67 

11 

0.22 

0.74 

0.77 

1.34 

1.27 

1.74 

1.52 

1.25 

1.61 

0.66 

0.18 

0.01 

094 

Mian.  .  . 

0.40 

0.93 

0.90 

1.74 

1.84 

2.18 

1.80 

1.45 

1.86 

0.94 

0.50 

0.15 

1.22 

4 

6.  6 

0.26 

0.25 

0.25 

0.29 

0.24 

0.11 

0.05 

0.13 

0.32 

0.43 

036 

0.24 

0.24 

7.  7 

0.26 

0.29 

0.28 

0.22 

0.06 

0.08 

0.04 

0.16 

0.32 

0.44 

0.30 

0.17 

0.22 

8.  8 

0-20 

0.26 

0.22 

0.08 

-0.14 

0.03 

0.02 

0.15 

0.21 

0.32 

0.16 

0.08 

0.13 

9.  9 

0.11 

0.16 

0.12 

-0.08 

-0.28 

-0.03 

-0.02 

0.09 

0.08 

0.14 

-0.03 

-0.08 

0.02 

10.10 

-0.06 

0.01 

-0.03 

-0.21 

-0.37 

-0.08 

0.06 

0.01 

-0.09 

-0.11 

-0.21 

-0.18 

-0.11 

7.  2.  9 

-0.10 

-0.22 

-0.17 

-0.36 

-0.39 

-0.42 

-030 

-0.27 

-0.25 

-0.22 

-021 

-0.05 

-0.25 

6.  2.  8 

-0.08 

-0.21 

-0.13 

-0.28 

-0.30 

-0.39 

-0.26 

-0.20 

-0.20 

-0.18 

-0.17 

-0.02 

-020 

6.  2.10 

-0.04 

-0.06 

0.01 

0.05 

0.14 

0.05 

0.13 

007 

0.19 

-0.00 

-0.08 

0.03 

0.04 

6.  2.  6 

-0.14 

-0.41 

-0.38 

-0.67 

-0-73 

-0.90 

-0.73 

-0.68 

-0.76 

-0.44 

-0.28 

-0.04 

-0.51 

7.  2 

-0.22 

-0.50 

-0.48 

-0.78 

-0.61 

-0.95 

-0.80 

-0.76 

-0.78 

-0.42 

-0.26 

0.03 

-0.54 

8.  2 

-0.32 

-0.67 

-0.70 

-1.20 

-1.14 

-1.38 

-1.18 

-1.11 

-1.30 

-0.72 

-0.47 

-0.10 

-O.S6 

8.  1 

-0.35 

-0.64 

-0.67 

-1.17 

-1.08 

-1.29 

-1.10 

-0.98 

-1.23 

-0.67 

-0.43 

-0.13 

-0.81 

7.  1 

-0.25 

-0.47 

-0.45 

-0.75 

-0.54 

-0.85 

-0.72 

-0.62 

-0.71 

-0.38 

-0.22 

-0.00 

-0.50 

9.12.3.9 

-0.37 

-0.67 

-0.68 

-1.24 

-1  40 

-1.34 

-1.08 

-0.99 

-1.29 

-0.89 

-0.68 

-0.32 

-0.91 

7.  2.2(9) 

-0.04 

-0.08 

-0.01 

-0.15 

-0.28 

-0.16 

-0.05 

-0.02 

0.02 

-0.12 

-0.23 

-0.09 

-0.10 

Dail.ext. 

-0.15 

-0.24 

-0.14 

0.02 

0.33 

0.03 

0.02 

-0.08 

-0.02 

-0.10 

0.04 

0.10 

-0.02 

The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

66 


LIX. 
PRUSSIA.  —  STETTIN.     Lat.  53°  25  N.     Long.  14°  34'  E.  Greenw. 

Corrections  to  be  applied  to  the  Cleans  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 


Degrees  of  Reaumur. 


Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

NOT. 

Dec. 

Year. 

Midnight. 

0.26     0.54 

0.98 

1.66 

2.21 

2.21 

1.83 

1.93 

1.53 

0.88 

0.50 

0.39 

1.24 

1 

0.3S     0.39 

1.17 

1.91 

2.66 

2.46 

2.25 

2.24 

1.61 

1.01 

0.44 

0.46 

1.43 

2 

0.43  j   0.70 

1.30 

2.15 

3.03 

2.84 

2.62 

2.54 

1.87 

1.13 

0.47 

0.50 

1  63 

3 

0.49  !   0.83 

1.41 

2.39 

3.39 

3.10 

2.95 

2.83 

2.11 

1.24 

0.51 

0.56 

1.99 

i 

I 

4 

0.53     0.89 

1.51 

2.60 

3.53 

3.08 

3.07 

3.08 

2.33 

1.33 

0.55 

0.61 

1.92 

5 

0.57     0.97 

1.63     2.67 

3.45 

2.78 

2.85 

3.10 

2.46 

1.40 

0.58 

0.64 

1.92 

6 

0.55     0.94 

1.62 

2.40 

2.78 

2.12 

2.21 

2.78 

2.45 

1.42 

0.60 

0.56 

1.70 

7 

0.46 

O.S3 

1.37 

1.70 

1.63 

1.17 

1.31 

2.02 

1.98 

1.25 

0.52 

0.46 

1.23 

S 

0.36 

!   0.66 

0.90 

0.66 

0.33 

0.20 

0.35 

0.96 

1.11 

0.79 

0.43 

0.33 

0.59 

9             0.22     0.36 

0.23-0.42 

-0.88-0.72 

-0.53 

-0.26 

-0.05 

0.16 

0.13 

0.23 

-0.13 

10        ;  -0.04  -0.02 

-0.44-1.33  -1.S7-1.54  -1.33  -1.40|-1.11 

-0.55 

-0.22 

-0.03 

-083 

11 

-0.36 

-0.53-1.06-2.07 

-2.62  -2.18  -1.96  -2.23 

-1.96 

-1.23 

-0.60  -0.33 

-1.43 

Noon.         -0.63 

-0.93  1-1.59 

-2.50 

-3.09  -2.59 

-2.46 

-2.93 

-2.58 

-1.68 

-0.90 

-0.64 

-1.38 

!          _o.Sl  -1.26  -1.92  -2.80  j-3.36  -2.90  -2.81  -3.38  -2.88  -1.98  -1.06  ;-O.S6;  -2.17 

2          -0.93  '-1.33  -2.0S  -2.94-3.50  -2.99  -2.99  -3.50  -2.99  -2.06  -1.06  -0.94-2.28 

3          -0.78 

-1.34 

-2.06 

-2.84 

-3.35 

-2.90 

-2.80 

-3.38 

-2.82  j-1.88 

-0.94 

-0.36 

-2.16 

4          -0.63 

-1.15 

-1.84 

-2.54 

-2.99 

-2.99 

-2.60 

-3.03 

-2.44 

-i.43 

-0.68 

-0.70 

-1.92 

5         1-0.41 

-0.83  -1.43  -2.02  -2.46  -2.46  -2.15  -2.40  -1.85  -0.99  -0.39  -0.48-1.49 

6          -0.23 

-0.46-0.90-1.32-1.74-1.74-1.62-1.63  -1.14-0.46-0.19  -O.r,0  -0.98 

7          -0.11 

-0.23  -0.40 

-0.55 

-0.89-0.89  -0.93 

-0.78 

-0.52 

-0.10 

-0.00 

-0.  IS  -0.46 

8 

0.01-0.04-0.02 

0.10  -0.14  -0.14 

-0.17 

0.02 

0.06 

0.17 

0.18 

-0.0«  -0.00 

9 

0.03 

0.16 

0.32     0.63 

0.73     0-73 

0.48 

0.74 

0.60 

0.39 

0.80     0.07  ,   0.31 

10 

0.20 

0.30 

0.61 

1.10 

1.30 

1.30 

1.03 

1.20 

1.00 

0.58 

0.43 

0.22 

0.77 

11 

0.25 

0.42 

0.79 

1.42 

1.76 

1.76 

1.47 

1.60 

1.31 

0.74 

0.50 

0.32 

1.03 

* 

6,  6 

0.15 

0.24 

0.36 

0.54 

0.52 

0.19 

0.29 

0.55 

0.65 

0.48 

0.21 

0.13 

0.36 

7,  7 

0.17 

0.30 

0.48 

0.57 

0.37 

0.14     0.19 

0.62 

0.73 

0.57 

0.26     0.14      0.33 

8,  S 

0.19 

0.31 

0.44 

0.38 

0.10 

0.03  i   0.09 

0.49 

0.59 

0.43 

0.31     0.16      O.::0j 

9,  9 

0.15 

0.26 

0.28 

0.13 

-0.08 

0.01 

-0.03 

0.24 

0.28 

0.28 

0.22 

0,15      0.16 

10,  10 

0.03 

0.14 

0.09 

-0.13 

-0.29 

-0.12 

-0.15 

-0.10 

-0.06 

0.02 

0.11 

< 
0.10  -0.03 

7,  1 

-0.17 

-0.21 

-0.67  -0.55  -0.86  -0.86  -0.75 

-0.68  ,-0.45  -0.36  -0.27  -0.20-0.50 

7,  2,  9 

-0.13-0.13  -0.13-0.19 

-0.33-0.36-0.40 

-0.25  '-0.14  -0.14  -O.OS  -0.14  -0.21 

6,  2,  10 

i 

-0.05 

-0.05 

0.38 

0.19 

0.19 

0.14 

0.03 

0.16 

0.15  1-0.02  -0.01  -0.03     0.09 

1 
Dailv  cxt.   —0.16 

-0.21  -0.23 

-0.14 

0.04 

0.06 

0.04 

-0.20 

-0.27  -0.32  -0.23  -0.15  -0.15 

i 

I                          i             i             ; 

!             '            ! 

1 

The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

67 


LX. 

SLESWICK.  —  APENRADE.     Lat.  55°  3'  N.     Long.  9°  25'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Allg". 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.26 

0.69 

0.98 

1.73 

3.18 

3.82 

2.50 

2.61 

2.16 

1.06 

0.54 

0.31 

1.65 

2 

0.31 

0.78 

1.14 

1.83 

3.17 

3.90 

2.38 

2.66 

2.29 

1.19 

0.59 

0.35 

1.72 

3 

0.38 

0.79 

1.26 

1.98 

3.02 

3.82 

2.13 

2.66 

2.54 

1.30 

0.64 

0.37 

1.74 

4 

0.42 

0.75 

1.34 

2.10 

2.71 

3.50 

1.78 

2.64 

2-62 

1.37 

0.66 

0.38 

1.69 

5 

0.44 

0.69 

1.31 

2.02 

2-22 

2.89 

1.35 

2.18 

2.43 

1.36 

0.69 

0.40 

1.50 

6 

0.50 

0.62 

1.18 

1.63 

1.54 

1.94 

0.86 

1.56 

2.02 

1.25 

0.69 

0.40 

1.18 

7 

0.47 

0.54 

0.90 

1.15 

0.70 

0.83 

0.30 

0.77 

1.18 

0.97 

0.61 

0.37 

0.73 

8 

0.39 

0.38 

0.50 

0.41 

-0.23 

-0.34 

-0.29 

-0.18 

0.18 

0.52 

0.42 

0.27 

0.17 

9 

0.23 

0.10 

-0.02 

-0.42 

-1.14 

-1.38 

-0.87 

-1.10 

-0.83 

-0.10 

0.10 

0.10 

-0.44 

10 

-0.06 

-0.32 

-0.66 

-1.22 

-1.90 

-2.16 

-1.40 

-1.98 

-1.71 

-0.79 

-0.30 

-0.15 

-1.00 

11 

-0.36 

-0.78 

-  .15 

-1.90 

-2.49 

-2.66 

-1.80 

-2.42 

-2.38 

-1.38 

-0.68 

-0.43 

-1.41 

Noon.  .  . 

-0.62 

-1.19 

-  .62 

-2.42 

-2.86 

-2.98 

-2.09 

-2.74 

-2.79 

-1.94 

-0.98 

-0.66 

-1.91 

1 

-0.78 

-1.40 

-  .90 

-2.75 

-3.08 

-3.24 

-2.23 

-2.89 

-3.03 

-2.15 

-1.10 

-0.78 

-2.11 

2 

-0.69 

-1.34 

-  .96 

-2.89 

-3.16 

-3.49 

-2.27 

-2.90 

-3.08 

-2.07 

-1.02 

-0.75 

-2.14 

3 

-0.61 

-1.06 

-  .78 

-2.79 

-3.10 

-3.68 

-2.21 

-2.78 

-2.93 

-1.74 

-0.82 

-0.59 

-2.01 

4 

-0.38 

-0.64 

-  .41 

-2.43 

-2.86 

-3.62 

-2.02 

-2.39 

-2.54 

-1.23 

-0.59 

-0.38 

-1.71 

5 

-0.16 

-0.23 

-0.92 

-1.80 

-2.40 

-3.34 

-1.70 

-2.02 

-1.93 

-0.71 

-0.29 

-0.15 

-1.30 

6 

-0.03 

0.05 

-0.42 

-0.99 

-1.70 

-2.57 

-1.18 

-1.23 

-1.13 

-0.25 

-0.12 

0.02 

-0.80 

7 

0.01 

0.18 

0.02 

-0.12 

-0.79 

-1.42 

-0.57 

-0.47 

-0.26 

0.10 

0.02 

0.10 

-0.27 

8 

0.03 

0.18 

0.33 

0.66 

0.22 

-0.07 

0.18 

0.40 

0.56 

0.34 

0.03 

0.14 

0.25 

9 

0-01 

0.17 

0.54 

1.25 

1.22 

1.25 

0.97 

1.21 

1.21 

0.51 

0.09 

0.15 

0.71 

10 

0.02 

0.22 

0.66 

1.57 

2.05 

2.33 

1.63 

1.72 

1.61 

0.65 

0.18 

0.18 

1.07 

11 

0.07 

0.33 

0.76 

1.69 

2.66 

3.10 

2.14 

2.25 

1.83 

0.85 

0.30 

0.21 

1.35 

Midn.  .  . 

0.15 

0.52 

0.86 

1.70 

3.02 

3.57 

2.43 

1.68 

1.97 

0.92 

0.42 

0.26 

1.46 

6.  6 

0.24 

0.34 

0.38 

0.32 

-0.08 

-0.32 

-0.16 

0.17 

0.45 

0.50 

0.29 

0.21 

0.19 

7.  7 

0.24 

0.36 

0.46 

0.52 

-0.05 

-0.30 

-0.14 

0.15 

0.46 

0.54 

0.30 

0.24 

0.23 

8.  8 

0.21 

0.28 

0.42 

0.54 

-0.01 

-0.21 

-0.06 

0.11 

0.37 

0.43 

0.23 

0.21 

0.21 

9.  9 

0.11 

0.14 

0.26 

0.42 

0.04 

-0.07 

0.05 

0.06 

0.19 

0.21 

0.10 

0.13 

0.14 

lO.ld 

-0.02 

-0.05 

-0.00 

0.18 

0.08 

0.09 

.  0.12 

-0.13 

-0.05 

-0.07 

-0.06 

0.02 

0.01 

7.  2.  9 

-0.08 

-0.21 

-0,17 

-0.16 

-0.41 

-0.47 

-0.33 

-0.31 

-0.23 

-0.20 

-0.11 

-0.08 

-0.23 

6.  2.  8 

-0.05 

-0.18 

-0.15 

-0.20 

-0.47 

-0.54 

-0.41 

-0.31 

-0.17 

-0.16 

-0.10 

-0.07 

-0.23 

6.  2.10 

-0.06 

-0.17 

-0.04 

0.10 

0.14 

0.26 

0.07 

0.13 

0.18 

-0.06 

-0.05 

-0.06 

0.04 

6.  2.  6 

-0.07 

-0.22 

-0.40 

-0.75 

-1.11 

-1.37 

-0.86 

-0.86 

-0.73 

-0.36 

-0.15 

-0.11 

-0.58 

7.  2 

-0.11 

-0.40 

-0.53 

-0.87 

-1.23 

-1.33 

-0.99 

-1.07 

-0.95 

-0.55 

-0.21 

-0.19 

-0.70 

8.  2 

-0.15 

-0.48 

-0.73 

-1.24 

-1.70 

-1.92 

-1.28 

-1.54 

-1.45 

-0.78 

-0.30 

-0.24 

-0.98 

8.  1 

-0.20 

-0.51 

-0.70 

-1.17 

-1.66 

-1.79 

-1.26 

-1.54 

-1.43 

-0.82 

-0.34 

-0.26 

-0.97 

7.  1 

-0.16 

-0.43 

-0.50 

-0.80 

-1.19 

-1.21 

-0.97 

-1.06 

-0.93 

-0.59 

-0.25 

-0.21 

-0.69 

9.12.3.9 

-0.25 

-0.50 

-0.72 

-1.10 

-1.47 

-1.70 

-1.05 

-1.35 

-1.34 

-0.82 

-0.40 

-0.25 

-0.91 

7.  2.2(9*) 

-0.06 

-0.12 

0.01 

0.19 

0.01 

-0.04 

-0.01 

0.07 

0.13 

-0.02 

-0.06 

-0.02 

0.01 

Dail.ext. 

-0.14 

-0.31 

-0.31 

-0.40 

0.01 

0.11 

0.12 

-0.12 

-0.23 

-0.39 

-0.21 

-0.19 

-0.20 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

68 


LXI. 

SCOTLAND.  —  LEITH.     Lot.  55°  59'  N.     Long.  3°  10'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 

Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Fahrenheit. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.38 

0.86 

1.76 

3.02 

3.04 

3.29 

4.10 

2.95 

2.54 

1.10 

1.26 

0.72 

2.09 

2 

0.61 

0.77 

1.98 

3.92 

3.47 

3.62 

4.28 

3.20 

2.77 

1.19 

1.53 

0.65 

2.33 

3 

0.68 

0.77 

2.41 

4.57 

3.96 

3.74 

4.66 

3.49 

3.29 

1.31 

1.40 

0.61 

2.57 

4 

0.95 

0.95 

2.59 

5.31 

4.41 

3.98 

5.11 

3.71 

3.65 

1.33 

1.46 

0.70 

2.84 

5 

1.06 

1.17 

2.75 

5.49 

4.28 

3.94 

4.59 

3.65 

3.78 

1.62 

1.37 

0.77 

2.87 

6 

1.06 

1.31 

2.79 

5.36 

3.51 

3.04 

3.56 

3.26 

3.51 

2.03 

1.28 

0.59 

2.61 

7 

0.97 

1.24 

2.48 

3.47 

2.66 

2.25 

2.39 

2.25 

2.75 

1.62 

1.06 

0.68 

1.98 

8 

0.88 

1.26 

1.80 

2.18 

1.40 

1.10 

1.15 

1.08 

1.46 

0.97 

1.04 

0.54 

1.24 

9 

0.61 

0.77 

0.81 

-0.27 

0.11 

-0.18 

-0.23 

-0.50 

-0.14 

0.32 

0.56 

0.32 

0.18 

10 

0.16 

-0.07 

0.18 

-2.00 

-1.06 

-1.31 

-1.37 

-1.26 

-1.10 

-0.83 

-0.34 

-0.02 

-0.75 

11 

-0.34 

-0.97 

-1.22 

-3.02 

-2.00 

-2.30 

-2.25 

-2.03 

-2.21 

-1.71 

-1.33 

-0.86  -1.69 

Noon.  .  . 

-1.04 

-1.69 

-2.61 

-3.92 

-2.75 

-2.79 

-3.58 

-2.99 

-3.13 

-2.36 

-1.96 

-1.33 

-2.51 

1 

-1.42 

-2.25 

-2.97 

-4.37 

-3.35 

-3.15 

-3.67 

-3.44 

-3.92 

-2.79 

-2.30 

-1.51 

-2.93 

2 

-1.58 

-2.23 

-3.29 

-4.73 

-3.78 

-3.83 

-4.07 

-3.65 

-4.28 

-2.84 

-2.57 

-1.55  -3.20 

3 

-1.60 

-2.27 

-3.38 

-5.09 

-3.85 

-4.37 

-4.37 

-3.65 

-4.16 

-2.57 

-2.63 

-1.13-3.26 

4 

-1.19 

-1.73 

-3.33 

-4.79 

-4.19 

-3.94 

-4.46 

-3.87 

-3.56 

-1.96 

-1.69 

-0.83 

-2.96 

5 

-0.68 

-0.95 

-2.84 

-4.25 

-4.03 

-3.71 

-4.57 

-3.76 

-3.56 

-1.31 

-1.04 

-0.50 

-2.60 

6 

-0.45 

-0.47 

-2.14 

-3.83 

-3.51 

-3.29 

-4.41 

-3.47 

-2.30 

-0.59 

-0.6S 

-0.27 

-2.12 

7 

-0.09 

-0.09 

-1.17 

-2.45 

-2.61 

-2.52 

-3.58 

-1.69 

-0.97 

0.05 

-0.25 

0.18 

-1.27 

6 

0.14 

0.32 

-0.45 

-0.81 

-1.17 

-0.79 

-1.31 

-0.41 

-0.16 

0.59 

0.05 

0.29 

-0.31 

9 

0.23 

0.61 

0.25 

0.38 

0.32 

0.50 

0.43 

0.59 

0.59 

0.72 

0.32 

0.36 

0.44 

10 

0.18 

0.88 

0.77 

1.08 

0.86 

1.89 

1.71 

1.58 

1.24 

1.15 

0.79 

0.41 

1.04 

11 

0.32 

0.99 

1.31 

2.18 

1.69 

2.16 

2.52 

2.23 

1.67 

1.60 

1.19 

0.54 

1.53 

Midn.  .  . 

0.38 

1.01 

1.44 

2.68 

2.32 

2.68 

3.44 

2.77 

2.27 

1.49 

1.42 

0.59 

1.87 

6.  6 

0.82 

0.43 

0.34 

0.77 

0.00 

-0.14 

-0.43 

-0.11 

0.61 

0.72 

0.32 

0.16 

0.25 

7.  7 

0.45 

0.59 

0.65 

0.52 

0.02 

-0.14 

-0.61 

0.29 

0.90 

0.83 

0.41 

0.43 

0.36 

8.  8 

0.52 

0.79 

0.68 

0.70 

0.11 

0.16 

-0.09 

0.34 

0.65 

0.79 

0.54 

0.43 

0.47 

9.  9 

0.43 

0.70 

0.54 

0.07 

0.23 

0.16 

0.11 

0.05 

0,23 

0.52 

0.45 

0.34 

0.32 

10.10 

0.18 

0.41 

0.47 

-0.47 

-0.11 

0.29 

0.18 

0.16 

0.07 

0.16 

0.23 

0.20 

0.15 

7.  2.  9 

-0.14 

-0.14 

-0.18 

-0.29 

-0.27 

-0.36 

-0.43 

-0.27 

-0.32 

-0.16 

-0.41 

-0.18 

-0.26 

6.  2.  8 

-0.14 

-0.20 

-0.32 

-0.07 

-0.47 

-0.52 

-0.61 

-0.27 

-0.32 

-0.07 

-0.41 

-0.23 

-0.30 

6.  2.10 

-0.11 

-0.02 

0.09 

0.56 

0.20 

0.36 

0.41 

0.41 

0.16 

0.11 

-0.16 

-0.18 

0.15 

6.  2.  6 

-0.32 

-0.47 

-0.88 

-1.06 

-1.26 

-1.35 

-1.64 

-1.28 

-1.01 

-0.47 

-0.65 

-0.41 

-0.90 

7.  2 

-0.32 

-0.50 

-0.41 

-0.63 

-0.56 

-0.79 

-0.86 

-0.70 

-0.77 

-0.61 

-0.77 

-0.45 

-0.61 

8.  2 

-0.36 

-0.50 

-0.74 

-1.28 

-1.19 

-1.37 

-1.46 

-1.28 

-1.42 

-0.95 

-0.77 

-0.52 

-0.99 

8.  1 

-0.27 

-0.50 

-0.59 

-1.10 

-0.99 

-1.04 

-1.26 

-1.19 

-1.24 

-0.92 

-0.63 

-0.50 

-0.85 

7.  1 

-0.23 

-0.52 

-0.25 

-0.45 

-0.36 

-0.45 

-0.65 

-0.61 

-0.59 

-0.59 

-0.63 

-0.41 

-0.47 

9.12.3.9 

-0.45 

-0.65 

-1.24 

-2.23 

-1.55 

-1.71 

-1.94 

-1.64 

-1.71 

-0.97 

-0.92 

-0.45 

-1.29 

7.  2.2(9) 

-0.05 

0.07 

-0.09 

-0.14 

-0.14 

-0.16 

-0.20 

-0.07 

-0.09 

0.07 

-0.23 

-0.05 

-0.09 

Bail.  ext. 

-0.27 

-0.49 

-0.29 

0.20 

-0.11 

-0.20 

0.27 

-0.09 

-0.25 

-0.40 

-0.56 

-0.40 

-0.20 

The  numbers  without  si.jjn  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 


E 


LXIT. 
SCOTLAND.  —  LEITH.     Lat.  55°  59'  N.     Long.  3°  10'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.17 

0.38 

0.78 

1.34 

1.35 

.46 

1.82 

1.31 

1.13 

0.49 

0.56 

0.32 

0.93 

2 

0.27 

0.34 

0.88 

1.74 

1.54 

.61 

1.90 

1.42 

1.23 

0.53 

0.68 

0.29 

1.04 

3 

0.30 

0.34 

1.07 

2.03 

1.76 

.66 

2.07 

.53 

1.46 

0.58 

0.62 

0.27 

1.14 

4 

0.42 

0.42 

1.15 

2.36 

1.96 

.77 

2.27 

.65 

1.62 

0.59 

0.65 

0.31 

1.26 

5 

0.47 

0.52 

1.22 

2.44 

1.90 

.75 

2.04 

.62 

1.68 

0.72 

0.61 

0.34 

1.28 

6 

0.47 

0.58 

1.24 

2.38 

1.56 

.35 

1.58 

.45 

1.56 

0.90 

0.57 

0.26 

1.16 

7 

0.43 

0.55 

1.10 

1.54 

1.18 

.00 

1.06 

.00 

1.22 

0.72 

0.47 

0.30 

0.88 

8 

0.39 

0.56 

0.80 

0.97 

0.62 

0.19 

0.51 

0.48 

0.65 

0.43 

0.46 

0.24 

0.55 

9 

0.27 

0.34 

0.36 

-0.12 

0.05 

-0.08 

-0.10 

-0.22 

-0.06 

0.14 

0.25 

0.14 

0.08 

10 

0.07 

-0.03 

0.08 

-0.89 

-0.47 

-0.58 

-0.61 

-0.56 

-0.49 

-0.37 

-0.15 

-0.01 

-0.33 

11 

-0.15 

-0.43 

-0.54 

-1.34 

-0.89 

-1.02 

-1.00 

-0.90 

-0.98 

-0.76 

-0.59 

-0.38 

-0.75 

Noon.  .  . 

-0.46 

-0.75 

-1.16 

-1.74 

-1.22 

-1.24 

-1.59 

-1.33 

-1.39 

-1.05 

-0.87 

-0.59 

-1.12 

1 

-0.63 

-1.00 

-1.32 

-1.94 

-  .49 

-1.40 

-1.63 

-  .53 

-1.74 

-1.24 

-1.02 

-0.67 

-1.30 

2 

-0.70 

-0.99 

-1.46 

-2.10 

-  .68 

-1.70 

-1.81 

-  .62 

-1.90 

-1.26 

-1.14 

-0.69 

-1.42 

3 

-0.71 

-1.01 

-1.50 

-2.26 

-  .71 

-1.94 

-1.94 

-  .62 

-1.85 

-1.14 

-1.17 

-0.50 

-1.45 

4 

-0.53 

-0.77 

-1.48 

-2.13 

-  .86 

-1.75 

-1.98 

-  .72 

-1.58 

-0.87 

-0.75 

-0.37 

-1.32 

5 

-0.30 

-0.42 

-1.26 

-1.89 

-  .79 

-1.65 

-2.03 

-  .67 

-1.58 

-0.58 

-0.46 

-0.22 

-1.15 

6 

-0.20 

-0.21 

-0.95 

-1.70 

-  .56 

-1.46 

-1.96 

-  .54 

-1.02 

-0.26 

-0.30 

-0.12 

-0.94 

7 

-0.04 

-0.04 

-0.52 

-1.09 

-  .16 

-1.12 

-1.59 

-0.75 

-0.43 

0.02 

-0.11 

0.08 

-0.56 

8 

0.06 

0.14 

-0.20 

-0.36 

-0.52 

-0.35 

-0.58 

-0.18 

-0.07 

0.26 

0.02 

0.13 

-0.14 

9 

0.10 

0.27 

0.11 

0.17 

0.14 

0.22 

0.19 

0.26 

0.26 

0.32 

0.14 

0.16 

0.20 

10 

0.08 

0.39 

0.34 

0.48 

0.38 

0.84 

0.76 

0.70 

0.55 

0.51 

0.35 

0.18 

0.46 

11 

0.14 

0.44 

0.58 

0.97 

0.75 

0.96 

1.12 

0.99 

0.74 

0.71 

0.53 

0.24 

0.68 

Midn.  .  . 

0.17 

0.45 

0.64 

1.19 

1.03 

1.19 

1.53 

1.23 

1.01 

0.66 

0.63 

0.26 

0.83 

6.  6 

0.14 

0.19 

0.15 

0.34 

0.00 

-0.06 

-0.19 

-0.05 

0.27 

0.32 

0.14 

0.07 

0.11 

7.  7 

0.20 

0.26 

0.29 

0.23 

0.01 

-0.06 

-0.27 

0.13 

0.40 

0.37 

0.18 

0.19 

0.16 

8.  8 

0.23 

0.35 

0.30 

0.31 

0.05 

0.07 

-0.04 

0.15 

0.29 

0.35 

0.24 

0.19 

0.21 

9.  9 

0.19 

0.31 

0.24 

0.03 

0.10 

0.07 

0.05 

0.02 

0.10 

0.23 

0.20 

0.15 

0.14 

10.10 

0.08 

0.18 

0.21 

-0.21 

-0.05 

0.13 

0.08 

0.07 

0.03 

0.07 

0.10 

0.09 

0.06 

7.  2.  9 

-0.06 

-0.06 

-0.08 

-0.13 

-0.12 

-0.16 

-0.19 

-0.12 

-0.14 

-0.07 

-0.18 

-0.08 

-0.12 

6.  2.  8 

-0.06 

-0.09 

-0.14 

-0.03 

-0.21 

-0.23 

-0.27 

-0.12 

-0.14 

-0.03 

-0.18 

-0.10 

-0.13 

6.  2.10 

-0.05 

-0.01 

0.04 

0.25 

0.09 

0.16 

0.18 

0.18 

0.07 

0.05 

-0.07 

-0.08 

0.07 

6.  2.  6 

-0.14 

-0.21 

-0.39 

-0.47 

-0.56 

-0.60 

-0.73 

-0.57 

-0,45 

-0.21 

-0.29 

-0.18 

-0.40 

7.  2 

-0.14 

-0.22 

-0-18 

-0.28 

-0.25 

-0.35 

-0.38 

-0.31 

-0.34 

-0.27 

-0.34 

-0.20 

-0.27 

8.  2 

-0.16 

-0.22 

-0.33 

-0.57 

-0.53 

-0.61 

-0.65 

-0.57 

-0.63 

-0.42 

-0-34 

-0.23 

-0.44 

8.  1 

-0.12 

-0.22 

-0.26 

-0.49 

-0.44 

-0.46 

-0.56 

-0.53 

-0.55 

-0.41 

-0.28 

-0.22 

-0.38 

7.  1 

-0.10 

-0.23 

-0.11 

-0.20 

-0.16 

-0.20 

-0.29 

-0.27 

-0.26 

-0.26 

-0.28 

-0.18 

-0.21 

9.12.3.9 

-0.20 

-0.29 

-0.55 

-0.99 

-0.69 

-0.76 

-0.86 

-0.73 

-0.76 

-0.43 

-0.41 

-0.20 

-0.57 

7.  2.2(9) 

-0.02 

0.03-0.04 

-0.06 

-0.06 

-0.07 

-0.09 

-0.03 

-0.04 

0.03 

-0.10 

-0.02 

-0.04 

Bail.  ext. 

-0.12 

-0.22  -0  13 

0.09 

0.05 

-0.09     0.12 

-0.04 

-0.11 

-0.18 

-0.25 

-0.18 

-0.09 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  — must  be  subtracted. 

70 


LXIII. 
SCOTLAND.  —  MAKERS-TOWN.     Lat.  55°  36'  N.     Long.  2°  31'  W.  Gr. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour. 

:    Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

IVc.    1    Year. 

Midu. 

0.67 

0.88 

1.24 

2.30 

2.00 

2.25 

2.10 

1.98 

1.95 

0.88 

0.46 

0.24 

1.41 

1 

0.76 

0.92 

1.37 

2.52 

2.04 

2.43 

2.44 

2.24 

2.15 

0.88 

0.46 

0.16 

1.53 

2 

i    0.78 

1.08 

1.37 

2.70 

2.33 

2.54 

2.57 

2.38 

2.26 

1.06 

0.60 

0.18 

1.651 

3 

0.76 

1.06 

1.48 

2.79 

2.55 

2.65 

2.79 

2.56 

2.35 

1.57 

0.60 

0.29 

1.79 

4 

0.67 

1.01 

1.66 

2.96 

2.51 

2.43 

2.70 

2.56 

2.48 

1.20 

0.68 

0.40 

1.77 

5 

0.78 

0.92 

1.77 

2.88 

2.06 

1.96 

2.21 

2.44 

2.46 

1.40 

0.60 

0.44 

1.66 

6 

0.60 

0.85 

1.73 

2.25 

1.31 

1.12 

1.35 

1.78 

2.22 

1.31 

0.66 

0.51 

1.31  1 

7 

0.51 

0.99 

1.26 

1.43 

0.48 

0.32 

0.46 

0.91 

1.24 

1.26 

0.66 

0.44 

0.83 

8 

0.53 

0.79 

0.46 

0.36 

-0.25 

-0.51 

-0.39  -0.09 

0.00 

0.62 

0.66 

0.40 

0.22 

9 

0.33 

0.08 

-0.33 

-0.79 

-0.94 

-1.11 

-0.96  -1-02   -1.00 

-0.16 

0.08 

0.22 

-0.47 

10 

-0.22 

-0.72 

-1.12 

-1.86 

-1.52 

-1.68 

-1.59  -1.73    -1.92 

-0.96 

-0.47 

-0.20 

-1.17 

11 

-0.84 

-1.21 

-1.67 

-2.55 

-2.09 

-2.26 

-2.14-2.33 

-2.45 

-1.63 

-0.94 

-0.62 

-1.73 

Noon. 

-1.36 

-1.61 

-2.09 

-3.06 

-2.34 

-2.48 

-2.45  -2.73 

-2.67 

-2.03 

-1.34 

-0.93 

-2.09 

1 

-1.71 

-2.03 

-2.27 

-3.44 

-2.69 

-2.75 

-2.48  -2.87 

-3.03  -2.25 

-1.56  -1.13   -2.35 

2 

-1.67 

-2.05 

-2.36 

-3.57 

-2.65  -2.57 

-2.52  -2.93 

-3.12 

-2.20 

-1.47  -0.96    -2.34 

3 

-1.29 

-1.68  -2.32 

-3.52 

-2.65 

-2.28 

-2.54  -2.73 

-2.85 

-1.83 

-0.96  -0.60   -2.10 

4 

-0.71 

-1.30-1.80 

-3.05  -2.27  -1.95 

-2.28  -2.47 

-2.29  -1.23 

-0.45  -0.16   -1.66, 

5 

-0.13 

-0.50-1.20 

-2.30 

-1.76  -1.64 

-1.81   -1.78 

-1.49 

-0.49 

-0.07 

-0.11    -1.11 

i 

6 

0.18 

-0.08 

-0.40 

-1.39 

-0.98 

-0.95 

-1.34  -1.07 

-0.60 

-0.09 

0.13 

0.18   -0.53 

7 

0.29 

0.15 

0.08  -0.19 

-0.18 

-0.40 

-0.59-0.18 

0.06 

0.17 

0.17 

0.18    -0.04 

8 

0.31 

0.37 

0.46 

0.52 

0.62 

0.36 

0.35 

0.56 

0.46 

0.40 

0.28 

0.18      0.41 

9 

0.29 

0.52 

0.73 

1.21 

1.15 

1.00 

0.95 

1.09 

0.95 

0.64 

0.37 

0.24      0.76' 

10 

0.27 

0.64 

0.95 

1.74 

1.46 

1.56 

1.48      1.58 

1.33 

0.73 

0.46      0.31       1.04 

11 

0.22 

0.79 

1.06 

2.08 

1.77 

1.94 

1.70 

1.89 

1.51 

0.73 

0.40      0..%'      1.20 

Mean. 

1.53      0.35 

2.06 

5.96 

6.86 

10.25 

10.12    10.00 

8.51      6.64 

4.60      1.16 

LXIV. 

IRELAND.  —  DUBLIN.    Lat.  53°  23'  N.    Long.  6°  20'  W.  Gr.  —  DOVE. 

Degrees  of  Reaumur. 

Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept.  |    Oct.        Nov.        Dec. 

Year. 

A.M.I 

0.58 

0.53 

1.56 

2.18 

2.53 

2.76 

2.18 

2.22 

1.64 

1.16 

0.53      0.36 

1.52 

3 

0.80 

0.71 

1.64 

2.40 

2.89 

3.11 

2.53 

2.40 

1.87 

1.42 

0.67 

0.49 

1.74 

5 

0.93 

0.98 

1.64 

2.49 

2.31 

2.18 

2.18 

2.53 

1.87 

1.73 

0.76 

0.58 

1.68 

7 

0.84 

0.93 

1.38 

0.58 

-0.22 

-0.89  -0.36 

0.40 

1.07 

1.56 

0.80      0.53 

0.56 

9 

0.36 

0.18 

-0.31 

-1.11 

-1.24 

-1.38  -1.10 

-1.16 

-0.76  -0.09 

0.27      0.36 

-0.50 

11 

-0.98 

-0.07 

-1.82 

-2.40 

-2.18 

-2.09 

-2.04 

-2.27 

-2.13 

-1.91 

-0.9s  -0.71 

-1.71 

P.M.I 

-1.60 

-1.78 

-2.67 

-2.93 

-2.62 

-2.40 

-2.27 

-2.62 

-2.67 

-2.44 

-1.56  -1.16 

-2.23 

3 

-1.33  -1.47 

-2.44 

-2.84 

-2.71 

-2.31 

-2.27 

-2-49  -2.22  -2.04 

-1.11  -0.67 

-1.99 

5 

-0.44     0.44 

-1.29 

-1.82 

-1.82 

-1.87  -1.64  -1.73 

-1.29 

-0.84 

-0.27 

-0.18 

-1.11 

7 

0.09     0.18 

0.18 

0.04 

-0.27 

-0.44  -0.27  -0.09 

0.27 

0.04 

0.04 

0.09 

-0.01  ! 

9 

0.22     0.31 

0.76 

1.20 

1.29 

1.24 

1.20 

1.16 

0.93 

0.58 

0.36 

0.18 

0.79 

11 

0.36     0.40 

1.07 

1.73      1.96 

2.04 

1.87 

1.64 

1.42 

0.84 

0.44 

0.22 

1.17 

Mean. 

4.09     4.75 

5.10 

6.66 

9.51 

11.86   12.48    12.31 

10.79 

7.73 

5.99 

4.88 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

71 


LXV. 

RUSSIA.  —  CATHARINENBURG.     Lat.  56°  50'  N.     Long.  60°  34'  E.  Greemo. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 

Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.59 

0.91 

1.84 

1.97 

3.09 

3.69 

3.51 

2.49 

1.99 

0.68 

0.47 

0.65 

1.82 

2 

0.58 

0.89 

2.09 

2.41 

3.52 

4.15 

3.76 

2.93 

2.27 

0.84 

0.42 

0.67 

2.04 

3 

0.53 

0.87 

2.42 

2.87 

3.80 

4.35 

3.96 

3.42 

2.60 

1.04 

0.36 

0.64 

2.24 

4 

0.48 

0.89 

2.80 

3.21 

3.82 

4.17 

4.01 

3.78 

2.89 

1.23 

0.35 

0.61 

2.35 

5 

0.58 

0.95 

3.11 

3.23 

3.45 

3.54 

3.78 

3.79 

2.98 

1.36 

0.43 

0.63 

2.32 

6 

0.54 

1.00 

3.15 

2.83 

2.67 

2.49 

3.18 

3.30 

2.74 

1.36 

0.55 

0.72 

2.04 

7 

0.60 

0.94 

2.76 

1.99 

1.57 

1.18 

2.21 

2.29 

2.11 

1.17 

0.64 

0.81 

1.52 

8 

0.56 

0.71 

1.90 

0.84 

0.31 

0.17 

0.98 

0.94 

1.16 

0.80 

0.60 

0.80 

0.79 

9 

0.37 

0.27 

0.65 

-0.41 

-0.88 

-1.35 

-0.34 

-0.48 

0.05 

0.28 

0.37 

0.61 

-0.07 

10 

-0.01 

-0.33 

-0.75 

-1.52 

-1.85 

-2.23 

-1.61 

-1.70 

-1.03 

-0.32 

-0.02 

0.21 

-0.93 

11 

-0.60 

-0.97 

-2.03 

-2.34 

-2.53 

-2.79 

-2.72 

-2.55 

-1.93 

-0.89 

-0.49 

-0.34 

-1.68 

Noon.  .  . 

-0.98 

-1.47 

-3.00 

-2.83 

-2.98 

-3.13 

-3.64 

-3.03 

-2.58 

-1.34 

-0.89 

-0.90 

-2.23 

1 

-1.30 

-1.75 

-3.52 

-3.04 

-3.25 

-3.35 

-4.33 

-3.25 

-2.98 

-1.62 

-1.12 

-1.32 

-2.57 

2 

-1.37 

-1.77 

-3.62 

-3.03 

-3.41 

-3.50 

-4.78 

-3.34 

-3.16 

-1.69 

-1.13 

-1.50 

-2.69 

3 

-1.19 

-1.55 

-3.39 

-2.88 

-3.46 

-3.56 

-4.90 

-3.36 

-3.17 

-1.58 

-0.95 

-1.40 

-2.62 

4 

-0.84 

-1.19 

-2.96 

-2.60 

-3.33 

-3.46 

-4.62 

-3.27 

-2.98 

-1.31 

-0.66 

-1.10 

-2.36 

5 

-0.34 

-0.79 

-2.40 

-2.18 

-2.95 

-3.09 

-3.90 

-2.98 

-2.57 

-0.96 

-0.37 

-0.73 

-1.94 

6 

-0.11 

-0.42 

-1.77 

-1.61 

-2.29 

-2.43 

-2.77 

-2.39 

-1.93 

-0.58 

-0.14 

-0.39 

-1.40 

7 

0.11 

-0.10 

-1.08 

-0.92 

-1.41 

-1.52 

-1.39 

-1.53 

-1.12 

-0.23 

0.01 

-0.14 

-0.78 

8 

0.22 

0.17 

0.36 

-0.22 

-0.42 

-0.48 

0.03 

-0.53 

-0.26 

0.06 

0.12 

0.03 

0.14 

9 

0.30 

0.42 

0.32 

0.42 

0.53 

0.56 

1.28 

0.43 

0.52 

0.26 

0.22 

0.15 

0.45 

10 

0.37 

0.63 

0.90 

0.91 

1.35 

1.51 

2.22 

1.20 

1.13 

0.40 

0.33 

0.28 

0.95 

11 

0.36 

0.80 

1.32 

1.29 

2.03 

2.35 

2.84 

1.74 

1.52 

0.48 

0.42 

0.43 

1.30 

Midn.  .  . 

0.55 

0.89 

1.62 

1.61 

2.59 

3.07 

3.23 

2.12 

1.77 

0.56 

0.48 

0.57 

1.59 

6.  6 

0.21 

0.27 

0.69 

0.61 

0.19 

0.03 

0.20 

0.45 

0.40 

0.39 

0.21 

0.17 

0.32 

7.  7 

0.35 

0.42 

0.84 

0.53 

0.08 

-0.17 

0.41 

0.38 

0.49 

0.47 

0.33 

0.33 

0.37 

8.  8 

0.39 

0.44 

0.77 

0.31 

-0.05 

-0.33 

0.51 

0.20 

0.45 

0.43 

0.36 

0.41 

0.32 

9.  9 

0.33 

0.34 

0.49 

0.01 

-0.17 

-0.39 

0.47 

-0.03 

0.29 

0.27 

0.29 

0.38 

0.19 

10.10 

0.18 

0.15 

0.08 

-0.30 

-0.25 

-0.36 

0.31 

-0.25 

0.05 

0.04 

0.15 

0.25 

0.00 

7.  2.  9 

-0.16 

-0.14 

-0.18 

-0.21 

-0.44 

-0.59 

-0.43 

-0.21 

-0.18 

-0.09 

-0.09 

-0.18 

-0.20 

6.  2.  8 

-0.20 

-0.20 

-0.28 

-0.14 

-0.39 

-0.50 

-0.52 

-0.19 

-0.23 

-0.09 

-0.15 

-0.25 

-0.26 

6.  2.10 

-0.15 

-0.05 

0.14 

0.24 

0.20 

0.17 

0.21 

0.39 

0.24 

0.02 

0.08 

-0.17 

0.10 

6.  2.  6 

-0.31 

-0.40 

-0.75 

-0.60 

-0.01 

-1.15 

-1.46 

-0.81 

-0.78 

-0.30 

-0.24 

-0.39 

-0.68 

7.  2 

-0.39 

-0.42 

-0.43 

-0.52 

-0.92 

-1.16 

-1.29 

-0.53 

-0.53 

-0.26 

-0.25 

-0.35 

-0.59 

8.  2 

-0.41 

-0.54 

-0.86 

-1.10 

-1.55 

-1.84 

-1.90 

-1.20 

-1.00 

-0.45 

-0.27 

-0.35 

-0.96 

8.  1 

-0.37 

-0.52 

-0.81 

-1.10 

-1.47 

-1.76 

-1.68 

-1.16 

-0.91 

-0.41 

-0.26 

-0.26 

-0.89 

7.  1 

-0.35 

-0.41 

-0.38 

-0.53 

-0.84 

-1.09 

-1.06 

-0.48 

-0.44 

-0.23 

-0.24 

-0.26 

-0.53 

9.12.3.9 

-0.38 

-0.58 

-1.36 

-1.43 

-1.70 

-1.87 

-1.90 

-1.61 

-1.30 

-0.60 

-0.31 

-0.39 

-1.12 

7.  2.2(9) 

-0.04 

-0.00 

-0.06 

-0.05 

-0.20 

-0.30 

-0.00 

-0.05 

1.49 

0.00 

-0.01 

-0.10 

0.06 

Dail.ext. 

-0.39 

-0.39 

-0.24 

0.10 

0.18 

0.40 

-0.45 

0.22 

0.17 

-0.17 

-0.25 

-0.35 

-0.17 

E 


The  numbers  without  sign  must,  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

72 


LXVI. 

RUSSIA.  —  CATHARINENBURG.    Lot.  56°  50'  N.    Long.  60°  34'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour. 
Midn. 

j    Jan. 

Feb.     March. 

April.  |  May. 

June. 

July. 

Aug.       Sept. 

Oct. 

Nov. 

Dec. 

Year. 

1    0.42 

1.07 

1.70 

2.12 

2.64 

3.06 

2.93 

2.16 

1.96 

0.89 

0.47 

0.47 

1.66 

1 

!    0.52 

1.19 

2.00 

2.40 

3.11 

3.51 

3.41 

2.49 

2.31 

1.08 

0.51 

0.50 

1.92 

2 

0,52 

1.25 

2.23 

2.82 

3.49 

3.90 

3.86 

2.76 

2.58 

0.99 

0.54 

0.52 

2.12 

3 

0.55 

1.41 

2.53 

3.05 

3.73 

4.15 

4.11 

3.03 

2.83 

1.47 

0.58 

0.54      2.33 

4 

0.63 

1.52 

2.75 

3.26 

3.74 

3.92 

4.28 

3.22 

3.06 

1.61 

0.68 

0.58      2.44 

5 

0.68 

1.67 

2.85 

3.24 

3.27 

3.35 

3.66 

3.14 

3.22 

1.67 

0>71 

0.61 

j   2.34 

6 

7 

S 

0.73 
0.81 
0.88 

1.76 
1.76 
1.51 

3.06 
2.59 
1.46 

2.24 
1.61 
0.34 

2.27 
0.89 
-0.24 

1.99 
0.61 
-0.53 

2.47 
1.02 
-0.28 

2.45 
1.37 
0.18 

3.04 
2.27 
0.85 

1.69 
1.53 
0.91 

0.82 
0.85 
0.77 

0.64 
0.65 

0.58 

1.93 
1.33 
0.54 

9 
10 
11 

0.67 
0.13 

-0.57 

0.73 
-0.45 
-1.44 

-0.06 
-1.45 

-2.39 

-0.81  -1.09 
-1.99  [-1.94 

-2.62-2.72 

-1.46 
-2.23 
-2.93 

-1.45 
-2.35 
-3.10 

-0.97 
-1.72 
-2.54 

-0.57 
-1.68 
-2.50 

-0.03 
-0.78 
-1.46 

0.33 
-0.22 
-0.72 

0.39 
-0.08 
-0.71 

-0.36 
-1.23 
-1.98 

Noon. 
1 
2 

3 

-1.04 
-1.39 
-1.50 
-1.28 

-2.13 

-2.58 
-2.74 
-2.37 

-2.95  -3.09 
-3.27  -3.22 
-3.38  -3.26 
-3.18  -2.86 

-3.19 
-3.28 
-3.41 
-3.14 

-3.38 

-3.48 
-3.59 
-3.37 

-3.58 
-3.57 
-3.55 
-3.40 

-2.99 
-3.04 
-3.02 
-3.03 

-3.09 
-3.32 
-3.36 

-3.48 

-1.73 
-1.99 
-2.02 
-2.23 

-1.03 
-1.25 
-1.23 
-1.11 

-1.19  -2.45 
-1.43-2.65 
-1.39-2.70 
-1.00-2.54 

4 
5 

-0.85 
-0.50 

-1.97 
-1.23 

-2.82 
-2.20 

-2.65 
-2.14 

-2.99 
-2.60 

-3.05  -3.15 
-2.49  -2.67 

-2.83 
-2.37 

-3.18 

-2.48 

-1.61 

-0.95 

-0.79 
-0.47 

-0.61 
-0.33 

-2.21 
-1.71 

6 

-0.22 

-0.74 

-1.37 

-1.46 

-1.98 

-1.98 

-2.14 

-1.66 

-1.56 

-0.56 

-0.26 

-0.11 

-1.17 

7 

0.00 

-0.25 

-0.67 

'-0.59 

-0.95 

-1.17 

-1.29 

-0.79 

-0.65 

-0.22 

-0.07 

0.02 

-0.55 

8 

0.10 

0.08 

-0.12 

0.13 

-0.04 

-0.12 

-0.16 

0.11 

0.07 

0.06 

0.06 

0.11 

C.02 

9 

0.17 

0.40 

0.44 

0.65 

0.85 

0.96 

0.83 

0.84 

0.67 

0.36 

0.16 

0.26 

0.55 

10 

0.24 

0.65 

0.94 

1.13 

1.53 

1.88 

1.67 

1.39 

1.25 

0.53 

0.27 

0.39 

0.99 

11 

1    0.34 

0.86 

1.34 

1.58     2.13 

2.51 

2.36 

1.81 

1.65 

0.74 

0.40 

0.56 

1.36 

Mean. 

-10.76 

-9.50 

-5.83 

0.47     6.31 

12.08 

14.531  10.61 

6.32 

1.41 

-6.11  -11.68 

LXVII. 

RUSSIA.  —  ST.  PETERSBURG!     Lai.  59°  56'  N.    Long.  30°  18'  E.  Gr.—  DOVE. 

Degrees  of  Reaumur. 

j   Ilour.    j    Jan. 

Feb. 

March.    April.      May. 

June. 

July.      Aug.      Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn.        0.14 

0.38 

0.73 

1.44     2.08 

1.99 

1.77 

1.68 

1.17 

0.52 

0.15 

0.17 

1.02 

1      i      0.21 

0.44 

0.99 

1.68     2.43 

2.29 

2.05 

2.02 

1.38 

0.60 

0.17 

0.21 

1.21 

2 

0.25 

0.46 

1.22 

1.91     2.70 

2.56 

2.24 

2.24 

1.58 

0.65 

0.15 

0.27 

1.35 

3 
4 

0.30 
0.38 

0.52 
0.63 

1.38 
1.56 

2.11     2.91 
2.24     2.86 

2.73 
2.44 

2.43 
2.32 

2.48 
2.59 

.75 

.87 

0.73 

0.78 

0.25 
0.30 

0.34 
0.36 

1.49 
1.53 

5 

0.43 

0.72 

1.71 

2.28     2.38 

1.97 

1.92 

2.40 

.96 

0.84 

0.34 

0.34 

| 

1.44 

6 

0.45 

0.76 

1.75 

1.95     1.72 

1.33 

1.33 

1.96 

.90 

0.90 

0.37 

0.30 

1.23 

7 

0.41 

0.78 

1.57 

1.32     0.93     0.63 

0.64 

1.19 

.47 

0.82 

0.37 

0.29 

0.87 

8 

0.42 

0.60 

1.07 

0.65     0.14  -0.04 

0.05 

0.42 

0.81 

0.57 

0.32 

0.25 

0.44 

9 

0.35 

0.40 

0.40  -0.05  -0.59  -0.69 

-0.56 

-0.40      0.00 

0.20 

0.17 

0.17 

-0.05 

10 
11 

0.13 
-0.20 

-0.05 
-0^.48 

-0.19-0.78  -1.30  -1.21 
-0.86  1-1.42  -1.92  -1.71 

-1.12-1.07  -0.71 
-1.58  '  -1.64  !  -1.27 

-0.22 
-0.61 

0.00 
-0.20 

0.04 
-0.14 

-0.54 
-1.00 

E 


The  numbers  -without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

73 


LXVII. 

RUSSIA.  —  ST.  PETERSBURG,  Continued. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour. 

Jan. 

Feb. 

March. 

April. 

May.     June. 

July. 

Aug. 

Sept.       Oct.        Nov. 

Dec. 

Year. 

Noon. 

-0.3S 

-0.90 

-1.31 

-1.93 

-2.30 

-1.99 

-1.89 

-2.10 

-1.72-0.94 

-0.37 

-0.30 

-  .34 

1 

-0.63 

-0.97 

-1.62 

-2.10 

-2.41 

-2.17 

-2.03 

-2.47 

-2.26-1.75 

-0.64 

-0.48 

-  .63 

2 

-0.66 

-1.04 

-1.88 

-2.36 

-2.65 

-2.32 

-2.15 

-2.60 

-2.34  -1.29 

-0.63  -0.58 

-  .71 

3 

-0.55 

-0.99 

-1.94 

-2.49 

-2.90 

-2.45 

-2.29 

-2.64 

-2.31 

-1.06 

-0.46  -0.40 

-  .71 

4 

-0.33 

-0.83 

-1.92 

-2.65 

-2.92 

-2.60 

-2.41 

-2.80 

-2.27 

-0.86 

-0.20  -0.31 

-  .68 

5 

-0.25 

-0.45 

-1.53 

-2.31 

-2.48 

-2.23 

-2.06 

-2.45 

-1.76 

-0.50 

-0.16 

-0.22 

-1.37 

6 

-0.19 

-0.26 

-1.02 

-1.43 

-1.65 

-1.41 

-1.30 

-1.41 

-0.95 

-0.25 

-0.11 

-0.14 

-0.84 

7 

-0.18 

-0.16 

-0.55 

-0.61 

-0.74 

-0.71 

-0.63 

-062 

-0.35 

-0.09 

-0.05 

-0.10 

-0.40 

8 

-0.14 

-0.03 

-0.25 

-0.03 

0.06 

-0.03 

0.02 

0.09 

0.07 

0.07 

0.01 

O.OS 

-0.01 

9 

-0.11 

0.08 

0.03 

0.47 

0.79 

0.67 

0.64 

0.65 

0.40 

0.18 

0.08 

0.03 

0.33 

10 

-0.03 

0.17 

0.24 

0.84 

1.22 

1.25 

1.18 

1.05 

0.66 

0.33 

0.08 

0.02 

0.58  1 

11 

0.06 

0.30 

0.50 

1.17 

1.76 

1.65 

1.45 

1.40 

0.91 

0.45 

0.11 

0.11 

0.82 

Meanj  |-7.  4  1-6.73 

-3.56 

1.10 

7.01 

11.33   13.39   13.58 

8.43  |  3.61 

-0.80 

-3.75 

LXVIII. 

RUSSIA.  —  HELSINGFORS.     Lett.  60°  10'  N.     Long.  24°  57'  E.  Gr.  —  DOVE. 

Degrees  of  Reaumur. 

Hour.       Jan. 

Feb.     March.   April. 

May.      June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec.     !  Year. 

Midn. 

0.06 

0.47 

1.28 

1.61 

1.61 

2.01 

1.65 

1.36 

0.83 

0-37 

0.18 

0.20 

0.97 

1 

0.13 

0.49 

1.48 

1.87 

1.94 

2.44 

1.90 

1.68 

1.03 

0.45 

0.15 

0.21 

1.15 

2 

0.16 

0.52 

1.64 

2.07 

2.21 

2.84 

2.17 

1.98 

1.21 

0.55 

0.18 

0.18 

1.31 

3 

0.23 

0.67 

1.84 

2.21 

2.58 

3.04 

2.45 

2.23 

1.35 

0.65 

0.23 

0.15 

1.47 

4 

0.35 

0.64 

1.91 

2.37 

2.68 

2.77 

2.42 

2.49 

1.48 

0.62 

0.2S 

0.23 

1.52 

5 

0.38 

0.77 

1.98 

2.34 

2.28 

2.21 

2.05 

2.41 

1.63 

0.67 

0.33 

0.10 

1.43 

6 

0.38 

0.92 

2.01 

1.74 

1.31 

1.31 

1.33 

1.81 

1.63 

0.75 

0.33 

0.03 

1.13 

7 

0.41 

0.99 

1.78 

1.14 

0.58 

0.51 

0.55 

1.11 

1.28 

0.73 

0.36 

0.01 

0.79 

8 

0.43 

0.99 

1.04 

0.17 

-0.19 

-0.36 

-0.10 

0.26 

0.58 

0.57 

0.35 

0.00 

0.31 

9 

0.38 

0.55 

0.04 

-0.73 

-0.86 

-0.83 

-0.73 

-0-56 

-0.09 

0.33 

0.25 

0.06 

-0.18 

10 

0.08 

-0.20 

-0.89 

-1.49 

-1.39 

-1.29 

-1.23  -1.12  '-0.65 

-0.15 

0.13 

-0.07 

-0.69 

11 

-0.19 

-0.93 

-1.19 

-1.93 

-1.7G 

-1.83 

-1.63 

-1.59 

-1.05 

-0.47 

-0.19 

-0.32 

-1.09 

Noon. 

-0.72 

-1.25 

-2.36 

-2.26 

-1.82 

-1.76 

-1.80 

-2.02 

-  .67 

-0.90 

-0.59 

-0.42 

-  .46 

1 

-0.79 

-1.50 

-2.62  -2.46  -2.12-2.06 

-2.13  -2.26 

-  .82  -1.03 

-0.70  -0.45   -  .67 

2 

-0.74 

-1.60-2.62 

-2.56 

-2.19  -2.36 

-2.28 

-2.31 

-  .85  -1.10 

-0.64-0.42    -  .72 

3 

-0.49 

-1.33 

-2.46 

-2.37 

-2.16  -2.49 

-2.13 

-2.17 

-  .75 

-0.95 

-0.50  -0.22   -  .58 

4 

-0.24 

-0.90  -2.12 

-1.89 

-1.82-2.16 

-1.75 

-1.84 

-  .52 

-0.77 

-0.29  -0.02    -  .28 

5 

-0.12 

-0.43 

-1.56 

-1.59 

-1.49 

-1.89 

-1.48 

-1.64 

-  .20 

-0.43 

-0.17 

0.03 

-  -°° 

6 

-0.04 

-0.21 

-0.79 

-1.09 

-1,09 

-1.53 

-1.15 

-1.19 

-0.72 

-0.25 

-0.09 

-0.02   -0.68 

7 

0.03 

0.07 

-0.29 

-0.49 

-0.86-0.96 

-0.68 

-0.64 

-0.27 

-0.13 

-0.04 

0.01   -0.35 

8 

0.08 

0.20 

0.01 

0.14 

-0.16-0.36 

-0.10 

-0.14 

0.05 

-0.03 

0.00 

0.11    -0.02 

9 

0.10 

0.25 

0.44 

0.64 

0.44 

0.37 

0.55 

0.28 

0.23 

0.05 

0.06 

0.13      0.29 

10 

o.os 

0.35 

0.74 

1.04 

0.94 

1.04 

1.02 

0.71 

0.43 

0.13 

0.10 

0.18      0.56 

11 

0.01 

0.42 

1.01 

1.37 

1.34 

1.54 

1.37 

1.06 

0.63 

0.27 

0.18 

0.15      0.78 

Mean. 

-5.02  1-7.43 

-3.89  j-0.06 

5.11 

10.84 

12.75    14.11 

9.23 

4.55 

1.13    -3.42 

E 


The  numbers  \vithout  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

74 


LXIX. 

RUSSIA.  —  PETERSBURG.     Lat.  59°  56'  N.     Long.  30°  18'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 

Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.20 

0.3S 

0.92 

1.52 

2.59 

2.40 

1.98 

2.08 

1.39 

0.72 

0.14 

0.17 

1.21 

2 

0.23 

0.37 

1.10 

1.75 

2.84 

2.69 

2.26 

2.43 

1.67 

0.77 

0.13 

0.27 

1.38 

3 

0.22 

0.39 

1.30 

2.01 

3.03 

2.90 

2.49 

2.79 

1.97 

0.82 

0.14 

0.33 

1.53 

4 

0.21 

0.43 

1.49 

2.19 

3.05 

2.91 

2.57 

3.01 

2.20 

0.88 

0.16 

0.35 

1.62 

5 

0.26 

0.50 

1.59 

2.17 

2.79 

2.60 

2.37 

2.92 

2.25 

0.95 

0.20 

0.35 

1.5S 

6 

0.37 

0.57 

1.56 

1.88 

2.20 

1.98 

1.88 

2.46 

2.06 

0.98 

0.23 

0.34 

1.38 

7 

0.51 

0.56 

1.36 

1.35 

1.27 

1.13 

1.15 

1.70 

1.62 

0.92 

0.23 

0.33 

1.01 

8 

0.59 

0.46 

0.99 

0.68 

0.41 

0.24 

0.34 

0.79 

1.01 

0.72 

0.16 

0.31 

0.56 

9 

0.53 

0.23 

0.47 

-0.02 

-0.47 

-0.53 

-0.40 

-0.10 

0.31 

0.36 

0.03 

0.27 

0.06 

10 

0.33 

-0.09 

-0.13 

-0.65 

-1.16 

-1.09 

-0.97 

-0.86 

-0.42 

-0.09 

-0.16 

0.18 

-0.43 

11 

0.01 

-0.43 

-0.74 

-1.18 

-1.68 

-1.49 

-1.37 

-1.47 

-1.12 

-0.58 

-0.35 

0.03 

-0.86 

Noon.  .  . 

-0.34 

-0.73 

-1.28 

-1.62 

-2.09 

-1.83 

-1.67 

-2.01 

-1.75 

-0.99 

-0.49 

-0.15 

-1.25 

1 

-0.59 

-0.92 

-1.68 

-2.01 

-2.50 

-2.20 

-1.98 

-2.53 

-2.29 

-1.27 

-0.54 

-0.32 

-1.57 

2 

-0.68 

-0.95 

-1.89 

-2.33 

-2.91 

-2.62 

-2.31 

-3.01 

-2.67 

-1.36 

-0.49 

-0.44 

-1.81 

3 

-0.61 

-0.86 

-1.92 

-2.52 

-3.25 

-2.98 

-2.58 

-3.35 

-2.81 

-1.30 

-0.35 

-0.48 

-1.92 

4 

-0.45 

-0.67 

-1.75 

-2.50 

-3.36 

-3.12 

-2.68 

-3.39 

-2.65 

-1.12 

-0.18 

-0.44 

-1.86 

5 

-0.27 

-0.44 

-1.44 

-2.10 

-3.11 

-2.89 

-2.46 

-3.02 

-2.19 

-0.88 

-0.02 

-0.36 

-1.61 

6 

-0.15 

-0.22 

-1.04 

-1.01 

-2.44 

-2.26 

-1.94 

-2.26 

-1.50 

-0.62 

0.10 

-0.26 

-1.18 

7 

-0.12 

-0.02 

-0.60 

-0.86 

-1.37 

-1.33 

-1.15 

-1.25 

-0.72 

-0.37 

0.17 

-0.19 

-0.65 

8 

-0.13 

0.13 

-0.20 

-0.10 

-0.34 

-0.31 

-0.29 

-0.20 

-0.01 

-0.12 

0.19 

-0.14 

-0.13 

9 

-0.14 

0.24 

0.14 

0.54 

0.69 

0.61 

0.49 

0.66 

0.53 

0.11 

0.19 

-0.12 

0.33 

10 

-0.09 

0.32 

0.40 

0.96 

1.47 

1.30 

1.07 

1.24 

0.87 

0.33 

0.18 

-0.09 

0.66 

11 

0.02 

0.37 

0.59 

1.20 

2.00 

1.77 

1.45 

1.58 

1.05 

0.50 

0.17 

-0.02 

0.89 

Mian.  .  . 

0.12 

0.38 

0.75 

1.35 

2.33 

2.11 

1.73 

1.81 

1.20 

0.63 

0.16 

0.07 

1.05 

6.  6 

0.11 

0.18 

0.26 

0.14 

-0.12 

-0.14 

-0.03 

0.10 

0.28 

0.18 

0.17 

0.04 

0.10 

7.  7 

0.20 

0.27 

0.38 

0.25 

-0.05 

-0.10 

-0.00 

0.23 

0.45 

0.28 

0.20 

0.07 

0.18 

8.  8 

0.23 

0.29 

0.40 

0.29 

0.04 

-0.04 

0.03 

0.29 

0.50 

0.30 

0.18 

0.09 

0.22 

9.  9 

0.20 

0.24 

0.31 

0.26 

0.11 

0.04 

0.04 

0.28 

0.42 

0.24 

0.11 

0.08 

0.19 

10.10 

0.12 

0.12 

0.13 

0.15 

0.16 

0.11 

0.05 

0.19 

0.22 

0.12 

0.01 

0.05 

0.12 

7.  2.  9 

-0.10 

-0.05 

-0.13 

-0.15 

-0.32 

-0.29 

-0.22 

-0.22 

-0.17 

-0.11 

-0.02 

-0.08 

-0.16 

6.  2.  8 

-0.15 

-0.08 

-0.18 

-0.18 

-0.35 

-0.32 

-0.24 

-0.25 

-0.21 

-0.17 

-0.02 

-0.08 

-0.19 

6.  2.10 

-0.13 

-0.02 

0.02 

0.17 

0.25 

0.22 

0.21 

0.23 

0.09 

-0.02 

-0.03 

-0.06 

0.08 

6.  2.  6 

-0.15 

-0.20 

-0.46 

-0.69 

-1.05 

-0.97 

-0.79 

-0.94 

-0.70 

-0.33 

-0.05 

-0.12 

-0.54 

7.  2 

-0.09 

-0.20 

-0.27 

-0.49 

-0.82 

-0.75 

-0.58 

-0.66 

-0.53 

-0.22 

-0.13 

-0.06 

-0.40 

8.  2 

-0.05 

-0.25 

-0.45 

-0.83 

-1.25 

-1.19 

-0.99 

-1.11 

-0.83 

-0.32 

-0.17 

-0.07 

-0.63 

8.  1 

0.00 

-0.23 

-0.35 

-0.67 

-1.05 

-0.98 

-0.82 

-0.87 

-0.64 

-0.28 

-0.19 

-0.01 

-0.51 

7.  1 

-0.04 

-0.18 

-0.16 

-0.33 

-0.62 

-0.54 

-0.42 

-0.42 

-0.34 

-0.18 

-0.16 

0.01 

-0.28 

9.12.3.9 

-0.14 

-0.28 

-0.65 

-0.91 

-1.28 

-1.18 

-1.04 

-1.20 

-0.93 

-0.4G 

-0.16 

-0.12 

-0.70 

7.  2.2(9) 

-0.11 

0.02 

-0.06 

0.03 

-0.07 

-0.07 

-0.05 

0.00 

0.00 

-0.06 

0.03 

-0.09 

-0.04 

Dail.  ext. 

-0.05 

-0.19 

-0.17 

-0.17 

-0.16 

-0.11 

-0.06 

-0.19J-0.28 

-0.19 

-0.16 

-0.07 

-0.15 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

75 


RUSSIA.  —  HELSINGFORS. 


LXX. 

Lat.  60°  10'  N. 


Long.  24°  57'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.47 

0.85 

1.40 

2.10 

2.49 

3.37 

3.16 

2.58 

1.60 

1.06 

0.64 

0.34 

1.67 

2 

0.79 

.25 

1.86 

3.18 

2.82 

3.78 

3.48 

2.96 

2.09 

.45 

0.99 

0.68 

2.11 

3 

0.99 

.55 

2.28 

2.79 

2.89 

3.74 

3.45 

3.11 

2.48 

.70 

1.22 

0.91 

2.26 

4 

1.13 

.71 

2.52 

2.77 

2.62 

3.22 

3.02 

2.92 

2.61 

.74 

1.26 

0.97 

2.21 

5 

1.06 

.66 

2.49 

2.41 

2.06 

2.32 

2.25 

2.39 

2.40 

.51 

1.09 

0.84 

1.87 

6 

0.86 

.43 

2.16 

1.76 

1.30 

1.24 

1.23 

1.59 

1.84 

.10 

0.76 

0.59 

1.32 

7 

0.58 

.07 

1.57 

0.92 

0.49 

0.20 

0.17 

0.64 

1.06 

0.59 

0.38 

0.31 

0.67 

8 

0.28 

0.60 

0.79 

0.05 

-0.26 

-0.65 

-0.78 

-0.28 

0.21 

0.08 

0.02 

0.07 

0.01 

9 

0.01 

0.10 

-0.05 

-0.74 

-0.87 

-1.26 

-1.51 

-1.07 

-0.58 

-0.38 

-0.27 

-0.10 

-0.56 

10 

-0.25 

-0.42 

-0.87 

-1.35 

-1.34 

-1.65 

-2.02 

-1.68 

-1.23 

-0.77 

-0.48 

-0.22 

-  .02 

11 

-0.48 

-0.91 

-1.56 

-1.80 

-1.70 

-1.93 

-2.35 

-2.12 

-1.71 

-1.07 

-0.64 

-0.32 

-  .38 

Noon.  .  . 

-0.70 

-1.29 

-2.06 

-2.10 

-1.98 

-2.16 

-2.54 

-2.43 

-2.04 

-1.30 

-0.76 

-0.43 

-  .65 

1 

-0.86 

-1.54 

-2.36 

-2.30 

-2.19 

-2.36 

-2.65 

-2.61 

-2.23 

-1.42 

-0.85 

-0.54 

-  .83 

2 

-0.92 

-1.60 

-2.45 

-2.37 

-2.32 

-2.51 

-2.66 

-2.66 

-2.30 

-1.43 

-0.88 

-0.61 

-  .89 

3 

-0.84 

-1.47 

-2.32 

-2.31 

-2.31 

-2.55 

-2.55 

-2.55 

-2.20 

-1.30 

-0.82 

-0.60 

-  .82 

4 

-0.73 

-1.20 

-2.01 

-2.10 

-2.11 

-2.42 

-2.27 

-2.26 

-1.92 

-1.05 

-0.68 

-0.49 

-  .60 

5 

-0.52 

-0.87 

-1.56 

-1.73 

-1.77 

-2.13 

-1.85 

-1.80 

-1.48 

-0.74 

-0.48 

-0.33 

-1.27 

6 

-0.32 

-0.57 

-1.07 

-1.25 

-1.30 

-1.71 

-1.30 

-1.24 

-0.95 

-0.44 

-0.28 

-0.18 

-0.88 

7 

-0.19 

-0.38 

-0.60 

-0.72 

-0.78 

-1.20 

-0.68 

-0.62 

-0.42 

-0.22 

-0.16 

-0.11 

-0.51 

8 

-0.15 

-0.25 

-0.20 

-0.21 

-0.24 

-0.61 

-0.04 

-0.03 

-0.00 

-0.10 

-0.12 

-0.12 

-0.17 

9 

-0.16 

-0.18 

0.10 

0.26 

0.29 

0.07 

0.61 

0.52 

0.31 

-0.03 

-0.12 

-0.20 

0.12 

10 

-0.16 

-0.08 

0.36 

0.69 

0.82 

0.87 

1.27 

1.03 

0.54 

0.08 

-0.10 

-0.25 

0.42 

11 

-0.06 

0.12 

0.63 

1.13 

1.40 

1.75 

1.95 

1.54 

0.79 

0.29 

0.02 

-0.19 

0.78 

Midn.  .  . 

0.16 

0.44 

0.96 

1.60 

1.97 

2.63 

2.61 

2,08 

1.14 

0.63 

0.28 

0.02 

1.21 

6.  6 

0.27 

0.43 

0.55 

0.26 

-0.00 

-0.24 

-0.04 

0.18 

0.45 

0.33 

0.24 

0.21 

0.22 

7.  7 

0.20 

0.35 

0.49 

0.10 

-0.15 

-0.50 

-0.26 

0.01 

0.32 

0.19 

0.11 

0.10 

0.08 

8.  8 

0.07 

0.18 

0.30 

-0.08 

-0.25 

-0.63 

-0.41 

-0.16 

0.11 

-0.01 

-0.05 

-0.03 

-0.08 

9.  9 

-0.08 

-0.04 

0.03 

-0.24 

-0.29 

-0.60 

-0.45 

-0.28 

-0.14 

-0.21 

-0.20 

-0.15 

-0.22 

10.10 

-0.21 

-0.25 

-0.26 

-0.33 

-0.26 

-0.39 

-0.38 

-0.33 

-0.35 

-0.35 

-0.29 

-0.24 

-0.30 

7.  2.  9 

-0.17 

-0.24 

-0.26 

-0.40 

-0.51 

-0.75 

-0.63 

-0.50 

-0.31 

-0.29 

-0.21 

-0.17 

-0.37 

6.  2.  8 

-0.07 

-0.14 

-0.16 

-0.27 

-0.42 

-0.63 

-0.49 

-0.37 

-0.15 

-0.14 

-0.08 

-0.05 

-0.25 

6.  2.10 

-0.07 

-0.08 

0.02 

0.03 

-0.07 

-0.13 

-0.05 

-0.01 

0.03 

-0.08 

-0.07 

-0.09 

-0.05 

6.  2.  6 

-0.13 

-0.25 

-0.45 

-0.62 

-0.77 

-0.99 

-0.91 

-0.77 

-0.47 

-0.26 

-0.13 

-0.07 

-0.49 

7.  2 

-0.17 

-0.27 

-0.44 

-0.73 

-0.92 

-1.16 

-1.25 

-1.01 

-0.62 

-0.42 

-0.25 

-0.15 

-0.62 

8.  2 

-0.32 

-0.50 

-0.83 

-1.16 

-1.29 

-1.58 

-1.72 

-1.47 

-1.05 

-0.68 

-0.43 

-0.27 

-0.94 

8.  1 

-0.29 

-0.47 

-0.79 

-1.13 

-1.23 

-1.51 

-1.72 

-1.45 

-1.01 

-0.67 

-0.42 

-0.24 

-0.91 

7.  1 

-0.14 

-0.24 

-0.40 

-0.69 

-0.85 

-1.08 

-1.24 

-0.99 

-0.59 

-0.42 

-0.24 

-0.12 

-0.58 

9.12.3.9 

-0.42 

-0.71 

-1.08 

-1.22 

-1.22 

-1.48 

-1.50 

-1.38 

-1.13 

-0.75 

-0.49 

-0.33 

-0.98 

7.  2.2(9) 

-0.17 

-0.22 

-0.17 

-0.23 

-0.31 

-0.54 

-0.32 

-0.25 

-0.16 

-0.23 

-0.19 

-0.18 

-0.25 

Dail.ext. 

0.11 

0.06 

0.04 

0.41 

0.29 

0.62 

0.41 

0.23 

0.16 

0.16 

0.19 

0.18 

0.19 

The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

E  76 


LXXI. 

NORWAY.  —  CHRISTIANIA.    Lat.  59°  55'  N.     Long.  10°  43'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.16 

0.89 

1.07 

1.56 

2.55 

2.58 

2.21 

2.04 

1.64 

0.74 

0.52 

0.22 

1.35 

2 

0.21 

0.94 

1.30 

1.88 

2.85 

3.15 

2.53 

2.23 

1.88 

0.82 

0.50 

0.21 

1.54 

3 

0.27 

1.17 

1.51 

2.03 

•3.23 

3.28 

2.64 

2.41 

2.03 

0.94 

0.49 

0.28 

1.69 

4 

0.32 

1.49 

1.67 

2.12 

3.21 

3.05 

2.62 

2.60 

2.07 

1.06 

0.55 

0.30 

1.84 

5 

0.38 

1.60 

1.82 

2.23 

2.55 

2.39 

2.09 

2.44 

2.14 

1.16 

0.51 

0.22 

1.63 

6 

0.47 

1.54 

1.69 

1.81 

1.63 

1.31 

1.37 

1.98 

2.10 

1.16 

0.60 

0.11 

1.31 

7 

0.51 

1.67 

1.71 

1.28 

0.71 

0.43 

0.58 

1.00 

1.50 

1.13 

0.46 

0.19 

0.93 

8 

0.54 

1.42 

1.29 

0.56 

0.07 

-0.32 

-0.22 

0.10 

0.62 

0.75 

0.38 

0.15 

0.44 

9 

0.48 

1.11 

0.36 

-0.06 

-0.52 

-0.86 

-0.78 

-0.59 

0.01 

0.15 

0.17 

0.16 

-0.03 

10 

0.24 

0.27 

-0.35 

-0.67 

-1.19 

-1.57 

-1.26 

-1.23 

-0.78 

-0.48 

-0.23 

0.11 

-0.59 

11 

-0.17 

-0.69 

-0.96 

-1.38 

-1.66 

-2.05 

-1.74 

-1.67 

-1.44 

-  .00 

-0.76 

-0.20 

-  .14 

Noon.  .  . 

-0.67 

-1.32 

-1.48 

-1.80 

-2.17 

-2.29 

-2.02 

-2.11 

-2.02 

-  .30 

-1.06 

-0.40 

-  .55 

1 

-0.87 

-1.90 

-1.74 

-2.22 

-2.46 

-2.50 

-2.21 

-2.35 

-2.41 

-  .59 

-1.15 

-0.42 

-  .82 

2 

-1.04 

-2.22 

-1.95 

-2.32 

-2.46 

-2.40 

-2.20 

-2.50 

-2.54 

-  .67 

-1.15 

-0.35 

-  .90 

3 

-0.91 

-2.29 

-2.16 

-2,26 

-2.54 

-2.47 

-2.21 

-2.50 

-2.50 

-  .58 

-0.88 

-0.23 

-  .88 

4 

-0.62 

-2.00 

-1.99 

-2.11 

-2.53 

-2.29 

-2.00 

-2.32 

-2.35 

-  .33 

-0.55 

-0.12 

-  .68 

5 

-0.35 

-1.42 

-1.58 

-1.80 

-2.20 

-2.14 

-1.87 

-1.97 

-1.80 

-0.90 

-0.23 

-0.06 

-1.36 

6 

-0.12 

-1.10 

-1.10 

-1.27 

-1.82 

-1.70 

-1.48 

-1.48 

-1.21 

-0.52 

-0.02 

-0.03 

-0.99 

7 

-0.01 

-0.60 

-0.65 

-0.70 

-1.35 

-0.98 

-0.89 

-0.78 

-0.57 

-0.24 

0.11 

-0.10 

-0.58 

8 

0.12 

-0.32 

-0.20 

-0.14 

-0.44 

-0.31 

-0.30 

-0.10 

0.02 

0.18 

0.23 

-0.13 

-0.12 

9 

0.16 

0.09 

0.09 

0.36 

0.24 

0.44 

0.45 

0.55 

0.36 

0.36 

0.27 

-0.05 

0.28 

10 

0.27 

0.34 

0.36 

0.70 

0.93 

1.20 

1.06 

1.08 

0.81 

0.58 

0.33 

-0.04 

0.63 

11 

0.31 

0.52 

0.53 

0.99 

1.46 

1.76 

1.63 

1.41 

1.06 

0.75 

0.43 

0.10 

0.91 

Midn.  .  . 

0.33 

0.86 

0.77 

1.20 

1.90 

2.31 

2.00 

1.75 

1.38 

0.95 

0.48 

0.09 

1.17 

6.  6 

0.18 

0.22 

0.30 

0.27 

-0.10 

-0.20 

-0.06 

0.25 

0.45 

0.32 

0.29 

0.04 

0.16 

7.  7 

0.25 

0.54 

0.53 

0.29 

-0.32 

-0.28 

-0.16 

0.11 

0.47 

0.45 

0.29 

0.05 

0.18 

8.  8 

0.33 

0.55 

0.55 

0.21 

-0.19 

-0.32 

-0.26 

0.00 

0.32 

0.47 

0.31 

0.01 

0.16 

9.  9 

0.32 

0.60 

0.23 

0.15 

-0.14 

-0.21 

-0.17 

-0.02 

0.19 

0.26 

0.22 

0.06 

0.12 

10.10 

0.26 

0.31 

0.01 

0.05 

-0.13 

-0.18 

-0.10 

-0.08 

0.02 

0.05 

0.05 

0.04 

0.02 

7.  2.  9 

-0.12 

-0.15 

-0.05 

-0.23 

-0.50 

-0.51 

-0.39 

-0.32 

-0.23 

-0.06 

-0.14 

-0.07 

-0.23 

6.  2.  8 

-0.15 

-0.33 

-0.15 

-0.22 

-0.42 

-0.47 

-0.38 

-0.21 

-0.14 

-0.11 

-0.11 

-0.12 

-0.23 

6.  2.10 

-0.10 

-0.11 

0.03 

0.06 

0.03 

0.04 

0.08 

0.19 

0.12 

0.02 

-0.07 

-0.09 

0.02 

6.  2.  6 

-0.23 

-0.59 

-0.45 

-0.59 

-0.76 

-0.67 

-0.70 

-0.67 

-0.55 

-0.34 

-0.19 

-0.11 

-0.49 

7.  2 

-0.27 

-0.28 

-0.12 

-0.52 

-0.88 

-0.99 

70.81 

-0.75 

-0.52 

-0.27 

-0.35 

-o.os 

-0.49 

8.  2 

-0.25 

-0.40 

-0.33 

-0.88 

-1.20 

-1.04 

-0.99 

-1.20 

-0.96 

-0.46 

-0.39 

-0.10 

-0.68 

8.  1 

-0.17 

-0.24 

-0.23 

-0.83 

-1.20 

-1.09 

-1.00 

-1.13 

-0.90 

-0.42 

-0.39 

-0.14 

-0.64 

7.  1 

-0.18 

-0.12 

-0.02 

-0.47 

-0.88 

-1.04 

-0.82 

-0.68 

-0.46 

-0.23 

-0.35 

-0.12 

-0.50 

9.12.3.9 

-0.56 

-0.60 

-0.80 

-0.94 

-1.25 

-1.29 

-1.14 

-1.16 

-1.04 

-0.59 

-0.38 

-0.13 

-0.82 

7.  2.2(9) 

-0.05 

-0.09 

-0.02 

-0.08 

-0.32 

-0.27 

-0.18 

-0.10 

-0.08 

0.05 

-0.04 

-0.07 

-0,11 

Dail.ext. 

-0.25 

-0.31 

-0.17 

-0.05 

0.35 

0.39 

0.22 

0.05 

-0.20 

-0.26 

-0.28 

-0.06 

-0.05 

The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

E  77 

t    . 


NORWAY.  —  DRONTHEIM. 


LXXII. 
Lot.  63°  26'  N. 


Long.  10°  25'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.29 

0.41 

0.77 

1.94 

2.63 

2.64 

2.53 

2.51 

1.37 

0.89 

0.27 

0.33 

1.38 

2 

0.25 

0.50 

0.95 

2.09 

2.97 

2.76 

2.75 

2.68 

1.48 

0.91 

0.31 

0.31 

1.50 

3 

0.22 

0.64 

1.11 

2.19 

3.13 

2.82 

2.77 

2.91 

1.59 

0.97 

0.23 

0.42 

1.58 

4 

0.20 

0.71 

1.27 

2.32 

3.03 

2.82 

2.65 

2.77 

1.55 

1.07 

0.28 

0.34 

1.58 

5 

0.13 

0.75 

1.37 

2.05 

2.76 

2.52 

2.35 

2.58 

1.59 

0.86 

0.30 

0.42 

1.47 

6 

0.11 

0.82 

1.42 

1.67 

2.30 

1.96 

1.86 

2.13 

1.49 

0.71 

0.14 

0.43 

1.25 

7 

0.04 

0.58 

1.35 

1.36 

1.68 

1.39 

1.17 

1.58 

1.07 

0.42 

0.00 

0.36 

0.92 

8 

0.08 

0.23 

1.17 

0.94 

0.83 

0.61 

0.40 

1.02 

0.57 

0.06 

-0.02 

0.36 

0.52 

9 

0.00 

-0.08 

0.41 

-0.02 

-0.28 

-0.03 

-0.14 

0.22 

-0.07 

-0.29 

-0.14 

0.19 

-0.02 

10 

-0.09 

-0.48 

-0.13 

-0.85 

-1.29 

-0.92 

-1.30 

-1.22 

-0.89 

-0.59 

-0.16 

0.02 

-0.65 

11 

-0.16 

-0.78 

-0.65 

-1.90 

-2.09 

-2.01 

-1.95 

-2.63 

-1.34 

-0.88 

-0.33 

-0.12 

-1.24 

Noon.  .  . 

-0.59 

-1.08 

-1.35 

-2.57 

-2.81 

-2.43 

-2.77 

-3.21 

-2.05 

-1.20 

-0.38 

-0.42 

-1.75 

1 

-0.80 

-1.22 

-1.70 

-2.66 

-3.28 

-3.25 

-3.20 

-3.39 

-2.12 

-1.14 

-0.44 

-0.42 

-1.97 

2 

-0.68 

-1.15 

-1.70 

-2.46 

-3.27 

-3.32 

-3.07 

-3.36 

-2.28 

-1.09 

-0.42 

-0.47 

-1.94 

3 

-0.48 

-0.80 

-1.54 

-2.22 

-3.25 

-3.05 

-3.06 

-3.21 

-1.85 

-1.07 

-0.28 

-0.37 

-1.76 

4 

-0.36 

-0.56 

-1.37 

-1.83 

-2.90 

-2.78 

-2.41 

-2.81 

-1.43 

-0.86 

-0.16 

-0.29 

-1.48 

5 

-0.29 

-0.36 

-1.07 

-1.30 

-2.20 

-2.45 

-2.02 

-2.23 

-1.09 

-0.50 

-0.06 

-0.22 

-1.15 

6 

-0.17 

-0.11 

-0.75 

-0.90 

-1.70 

-1.84 

-1.15 

-1.27 

-0.79 

-0.51 

0.08 

-0.23 

-0.78 

7 

0.09 

-0.04 

-0.54 

-0.57 

-1.03 

-1.00 

-0.61 

-0.68 

-0.32 

-0.28 

0.09 

-0.30 

-0.43 

8 

0.27 

0.17 

-0.27 

-0.20 

-0.37 

0.04 

0.01 

0.11 

0.03 

-0.02 

0.17 

-0.19 

-0.02 

9 

0.45 

0.37 

0.00 

0.16 

0.50 

0.41 

0.66 

0.51 

0.43 

0.22 

0.05 

-0.11 

0.30 

10 

0.52 

0.53 

0.23 

0.61 

1.10 

1.08 

1.17 

1.18 

0.75 

0.55 

0.13 

-0.06 

0.65 

11 

0.47 

0.50 

0.43 

0.90 

1.61 

1.63 

1.48 

1.67 

1.02 

0.74 

OUl 

0.02 

0.88 

Midn.  .  . 

0.45 

0.49 

0.63 

1.27 

1.92 

2.07 

1.88 

2.13 

1.28 

1.14 

0.19 

0.02 

1.12 

6.  6 

-0.03 

0.36 

0.34 

0.39 

0.30 

0.06 

0.36 

0.43 

0.35 

0.10 

0.11 

0.10 

0.24 

7.  7 

0.07 

0.27 

0.41 

0.40 

0.33 

0.20 

0.28 

0.45 

0.38 

0.07 

0.05 

0.03 

0.24 

8.  8 

0.18 

0.20 

0.45 

0.37 

0.23 

0.33 

0.21 

0.57 

0.30 

0.02 

0.08 

0.09 

0.25 

9.  9 

0.23 

0.15 

0.21 

0.07 

0.11 

0.19 

0.26 

0.37 

0.18 

-0.04 

-0.05 

0.04 

0.14 

10.10 

0.22 

0.03 

0.05 

-0.12 

-0.10 

0.08 

-0.07 

-0.02 

-0.07 

-0.02 

-0.02 

-0.02 

0.00 

7.  2.  9 

-0.06 

-0.07 

-0.12 

-0.31 

-0.36 

-0.51 

-0.41 

-0.42 

-0.26 

-0.15 

-0.12 

-0.07 

-0.24 

6.  2.  8 

-0.10 

-0.05 

-0.18 

-0.33 

-0.45 

-0.44 

-0.40 

-0.37 

-0.25 

-0.13 

-0.04 

-0.08 

-0.23 

6.  2.10 

-0.02 

0.07 

-0.02 

-0.06 

0.04 

-0.09 

-0.01 

-0.02 

-0.01 

0.06 

-0.05 

-0.03 

-0.01 

6.  2.  6 

-0.25 

-0.62 

-0.39 

-0.56 

-0.89 

-1.06 

-0.79 

-0.83 

-0.53 

-0.30 

-0.07 

-0.09 

-0.53 

7.  2 

-0.32 

-0.29 

-0.18 

-0.55 

-0.80 

-0.97 

-0.95 

-0.89 

-0.61 

-0.34 

-0.21 

-0.06 

-0.51 

8.  2 

-0.30 

0.46 

-0.27 

-0.76 

-1.22 

-1.36 

-1.34 

-1.17 

-0.86 

-0.52 

-0.22 

-0.06 

-0.63 

8".  1 

-0.36 

-0.50 

-0.27 

-0.86 

-1.23 

-1.32 

-1.40 

-1.19 

-0.78 

-0.54 

-0.23 

-0.03 

-0.73 

7.  1 

-0.38 

-0.32 

-0.18 

-0.65 

-0.80 

-0.93 

-1.02 

-0.91 

-0.53 

-0.36 

-0.22 

-0.03 

-0.53 

9.12.3.9  ' 

-0.16 

-0.40 

-0.62 

-1.16 

-1.46 

-1.28 

-1.33 

-1.42 

-0.89 

-0.59 

-0.19 

-0.18 

-0.87 

7.  2.2(9) 

0.07 

0.04 

-0.09 

-0.19 

-0.15 

-0.28 

-0.15 

-0.19 

-0.09 

-0.16 

-0.02 

-0.12 

-0.11 

Dail.  ext. 

-0.14 

-0.20 

-0.14 

-0.17 

-0.08 

-0.25 

-0.22 

-0.24 

-0.35 

-0.07 

-0.07 

-0.02 

-0.16 

The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

E  78 


LXXIII. 

STRAIT  OF  KARA.     Lai.  70°  37'  N.     Long.  57°  47'  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

0.27 

0.38 

1.66 

2.53 

2.26 

1.86 

1.37 

0.62 

0.33 

0.00 

0.08 

0.55 

0.99 

2 

0.24 

0.38 

1.78 

2.67 

2.22 

1.68 

1.24 

0.58 

0.40 

0.02 

0.14 

0.42 

0.98 

3 

0.22 

0.40 

.86 

2.66 

2.06 

1.41 

1.03 

0.53 

0.49 

0.02 

0.14 

0.26 

0.92 

4 

0.23 

0.42 

.88 

2.44 

1.82 

1.12 

0.79 

0.47 

0.58 

0.06 

0.15 

0.11 

0.84 

5 

0.25 

0.42 

.80 

1.98 

1.48 

0".82 

0.54 

0.38 

0.61 

0.17 

0.22 

-0.00 

0.72 

6 

0.27 

0.33 

.55 

1.30 

1.01 

0.49 

0.25 

0.26 

0.58 

0.29 

0.36 

-0.15 

0.55 

7 

0.29 

0.16 

.10 

0.52 

0.40 

0.10 

-0.05 

0.10 

0.42 

0.35 

0.52 

-0.29 

0.30 

8 

0.30 

0.08 

0.42 

-0.27 

-0.30 

-0.33 

-0.35 

-0.07 

0.27 

0.32 

0.64 

-0.42 

0.01 

9 

0.26 

0.30 

-0.43 

-0.98 

-1.01 

-0.7S 

-0.66 

-0.23 

0.01 

0.18 

0.66 

-0.54 

-0.32 

10 

0.18 

-0.50 

-1.32 

-1.58 

-1.63 

-1.19 

-0.85 

-0.36 

-0.28 

0.02 

0.55 

-0.61 

-0.63 

11 

0.04 

-0.64 

-2.07 

-2.13 

-2.06 

-1.48 

-0.98 

-0.46 

-0.54 

-0.25 

0.33 

-0.62 

-0.91 

Noon.  .  . 

-0.12 

-0.70 

-2.56 

-2.41 

-2.27 

-1.62 

-1.04 

-0.55 

-0.72 

-0.37 

0.18 

-0.54 

-1.07 

1 

-0.31 

-0.70 

-2.70 

-2.67 

-2.26 

-1.62 

-1.03 

-0.63 

-0.81 

-0.43 

-0.13 

-0.44 

-1.14 

2 

-0.49 

-0.64 

-2.52 

-2.81 

-2.11 

-1.54 

-1.00 

-0.71 

-0.78 

-0.36 

-0.25 

-0.31 

-1.13 

3 

-0.60 

-0.53 

-2.10 

-2.75 

-1.88 

-1.40 

-0.95 

-0.76 

-0.66 

-0.23 

-0.30 

-0.21 

-1.03 

4 

-0.63 

-0.38 

-1.54 

-2.46 

-1.61 

-1.25 

-0.90 

-0.69 

-0.49 

-0.10 

-0.32 

-0.11 

-0.87 

5 

-0.58 

-0.21 

-0.98 

-1.91 

-1.30 

-1.05 

-0.78 

-0.59 

-0.30 

0.02 

-0.35 

-0.04 

-0.67 

6 

-0.46 

-0.02 

-0.47 

-1.18 

-0.90 

-0.76 

-0.59 

-0.38 

-0.13 

0.07 

-0.41 

0.06 

-0.43 

7 

-0.26 

0.14 

-0.04 

-0.37 

-0.40 

-0.35 

-0.29 

-0.09 

0.06 

0.08 

-0.48 

0.18 

-0.15 

.  8 

-0.06 

0.32 

0.34 

0.42 

0.20 

0.18 

0.11 

0.22 

0.11 

0.07 

-0.52 

0.33 

0.14 

9 

0.11 

0.42 

0.67 

1.08 

0.83 

0.78 

0.64 

0.46 

0.17 

0.06 

-0.49 

0.48 

0.43 

10 

0.22 

0.46 

0.98 

1.59 

1.42 

1.31 

0.94 

0.62 

0.20 

0.06 

-0.38 

0.61 

0.67 

11 

0.28 

0.44 

1.25 

1.98 

1.88 

1.71 

1.23 

0.68 

0.23 

0.06 

-0.20 

0.66 

0.85 

Midn.  .  . 

0.29 

0.40 

1.48 

2.29 

2.16 

1.90 

1.38 

0.66 

0.27 

0.01 

-0.03 

0.64 

0.95 

6.  6 

0.10 

0.16 

0.54 

0.06 

0.06 

-0.14 

-0.17 

-0.06 

0.23 

0.18 

-0.03 

-0.05 

0.06 

7.  7 

0.02 

0.15 

0.53 

0.08 

-0.00 

-0.13 

-0.17 

0.01 

0.24 

0.22 

0.02 

-0.06 

0.08 

8.  8 

0.12 

0.12 

0.38 

0.08 

-0.05 

-0.08 

-0.12 

0.08 

0.19 

0.20 

0.06 

-0.05 

0.08 

9.  9 

0.19 

0.06 

0.12 

0.05 

-0.09 

-0.00 

-0.06 

0.12 

0.09 

0.12 

0.09 

-0.03 

0.05 

10.10 

0.20 

-0.02 

-0.17 

0.01 

-0.11 

0.06 

0.05 

0.13 

-0.04 

0.04 

0.09 

-0.00 

0.02 

7.  2.  9 

-0.03 

-0.02 

-0.25 

-0.40 

-0.29 

-0.22 

-0.17 

-0.05 

-0.06 

0.02 

-0.07 

-0.04 

-0.13 

6.  2.  8 

-0.09 

-0.00 

-0.21 

-0.36 

-0.30 

-0.29 

-0.21 

-0.08 

-0.03 

-0.00 

-0.14 

-0.04 

-0.15 

6.  2.10 

-0.00 

0.05 

-0.00 

0.03 

0.11 

0.09 

0.06 

0.06 

-0.00 

-0.00 

-0.09 

0.05 

0.03 

6.  2.  6 

-0.23 

-0.11 

-0.48 

-0.90 

-0.67 

-0.60 

-0.45 

-0.28 

-0.11 

-0.00 

-0.10 

-0.13 

0.34 

7.  2 

-0.10 

-0.24 

-0.71 

-1.15 

-0.86 

-0.72 

-0.53 

-0.31 

-0.18 

-0.01 

0.14 

-0.30 

-0.41 

8.  2 

-0.10 

-0.36 

-1.05 

-1.54 

-1.21 

-0.94 

-0.68 

-0.39 

-0.26 

-0.02 

0.20 

-0.37 

-0.56 

8.  1 

-0.01 

-0.39 

-1.14 

-1.47 

-1.28 

-0.98 

-0.69 

-0.35 

-0.27 

-0.06 

0.26 

-0.43 

-0.57 

7.  1 

-0.01 

-0.27 

-0.80 

-1.08 

-0.93 

-0.76 

-0.54 

-0.27 

-0.20 

-0.04 

0.20 

-0.37 

-0.42 

9.12.3.9 

-0.09 

-0.28 

-1.11 

-1.27 

-1.08 

-0.76 

-0.53 

-0.27 

-0.30 

-0.09 

-0.01 

-0.20 

--0.50 

7.  2.2(9) 

0.01 

0.09 

-0.02 

-0.03 

-0.01 

0.03 

0.01 

0.08 

-0.01 

0.03 

-0.18 

0.09 

0.01 

Bail.  cxt. 

-0.17 

-0.12 

-0.41 

-0.07 

-0.01 

0.14 

0.17 

-0.04 

-0.10 

-0.04 

0.07 

0.02 

-0.08 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

79 


LXXIV. 

NOVAIA  ZEMLIA.  —  MATOSCHKIN  SCHAR.    Lat.  73°  — '  N.    Long.  57°  20'  E.  Gr. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Morn.  1 

-0.22 

0.16 

0.46 

1.63 

2.42 

1.70 

1.18 

0.73 

1.08 

-0.49 

-0.14 

-0.11 

0.70 

2 

-0.30 

0.09 

0.70 

1.34 

2.28 

1.54 

1.20 

0.79 

0.88 

-0.47 

-0.14 

0.05 

0.66 

3 

-0.31 

0.01 

0.91 

1.15 

1.89 

1.26 

1.11 

0.80 

0.62 

-0.22 

-0.10 

0.17 

0.61 

4 

-0.26 

-0.06 

1.02 

1.09 

1.41 

0.93 

0.94 

0.72 

0.46 

0.02 

-0.00 

0.26 

0.54 

5 

-0.14 

-0.09 

0.99 

0.81 

0.85 

0.161 

0.73 

0.55 

0.46 

0.20 

0.10 

0.34 

0.45 

6 

-0.03 

-0.09 

0.86 

0.63 

0.26 

0.30 

0.47 

0.30 

0.56 

0.26 

0.20 

0.41 

0.34 

7 

0.06 

-0.07 

0.62 

0.09 

-0.38 

-0.02 

0.18 

0.01 

0.58 

0.18 

0.26 

0.45 

0.16 

8 

0.10 

-0.05 

0.34 

-0.50 

-1.03 

-0.38 

-0.13 

-0.30 

0.38 

0.06 

0.26 

0.46 

-0.07 

9 

0.10 

-0.05 

0.02 

-1.14 

-1.65 

-0.78 

-0.46 

-0.58 

-0.00 

-0.06 

0.24 

0.43 

-0.33 

10 

0.07 

-0.06 

-0.28 

-1.78 

-2.17 

-  .16 

-0.75 

-0.79 

-0.71 

-0.19 

0.18 

0.37 

-0.61 

11 

0.05 

-0.10 

-0.58 

-2.02 

-2.53 

-  .45 

-0.97 

-0.91 

-1.24 

-0.14 

0.15 

0.28 

-0.79 

Noon.  .  . 

0.05 

-0.13 

-0.78 

-2.09 

-2.67 

-  .58 

-1.08 

-0.93 

-1.46 

-0.12 

0.11 

0.18 

-0.88 

1 

0.06 

-0.14 

-0.93 

-1.93 

-2.58 

-  .52 

-1.06 

-0.85 

-1.32 

-0.10 

0.08 

0.10 

-0.85 

2 

0.09 

-0.14 

-0.96 

-1.62 

-2.28 

-  .32 

-0.96 

-0.70 

-0.89 

-0.09 

0.02 

-0.02 

-0.74 

3 

0.10 

-0.11 

-0.88 

-1.26 

-1.83 

-  .05 

-0.81 

-0.52 

-0.40 

-0.07 

-0.04 

-0.11 

-0.58 

4 

0.10 

-0.07 

-0.71 

-0.80 

-1.30 

-0.78 

-0.66 

-0.32 

-0.07 

-0.02 

-0.10 

-0.20 

-0.41 

5 

0.10 

-0.03 

-0.50 

-0.54 

-0.72 

-0.57 

-0.54 

-0.14 

-0.02 

0.10 

-0.18 

-0.26 

-0.28 

6 

0.10 

0.02 

-0.30 

-0.26 

-0.14 

-0.38 

-0.43 

-0.00 

-0.17 

0.26 

-0.20 

-0.36 

-0.16 

7 

0.10 

0.06 

-0.16 

0.30 

0.46 

-0.16 

-0.30 

0.12 

-0.35 

0.40 

-0.18 

-0.43 

-0.01 

8 

0.12 

0.10 

-0.09 

0.70 

1.04 

0.15 

-0.11 

0.21 

-0.36 

0.46 

-0.14 

-0.48 

0.13 

9 

0.12 

0.15 

-0.06 

1.24 

1.59 

0.56 

0.14 

0.30 

-0.12 

0.36 

-0.10 

-0.49 

0.31 

10 

0.08 

0.19 

-0.02 

1.50 

2.06 

1.02 

0.46 

0.39 

0.33 

0.18 

-0.08 

-0.44 

0.47 

11 

-0.00 

0.21 

0.09 

1.75 

2.40 

1.42 

0.78 

0.50 

0.79 

-0.15 

-0.08 

-0.34 

0.61 

Midn.  .  . 

-0.11 

0.20 

0.23 

1.72 

2.55 

1.66 

1.03 

0.62 

1.06 

-0.39 

-0.11 

-0.22 

0.69 

6.  6 

0.04 

0.04 

0.28 

0.19 

0.06 

-0.04 

0.02 

0.15 

0.20 

0.26 

0.00 

0.03 

0.10 

7.  7 

0.08 

0.01 

0.23 

0.20 

0.04 

-0.09 

-0.06 

0.07 

0.12 

0.29 

0.04 

0.01 

0.08 

8.  8 

0.11 

0.03 

0.13 

0.10 

0.01 

-0.12 

-0.12 

-0.05 

0.01 

0.26 

0.06 

-0.01 

0.03 

9.  9 

0.11 

0.05 

-0.02 

0.05 

-0.03 

-0.11 

-0.16 

-0.14 

-0.06 

0.15 

0.07 

-0.03 

-0.01 

10.10 

0.08 

0.07 

-0.15 

-0.14 

-0.06 

-0.07 

-0.15 

-0.20 

-0.19 

-0.01 

0.05 

-0.04 

-0.07 

7.  2.  9 

0.09 

-0.02 

-0.13 

-0.10 

-0.36 

-0.26 

-0.21 

-0.13 

-0.14 

0.15 

0.06 

-0.02 

-0.09 

6.  2.  8 

0.06 

-0.04 

-0.06 

-0.10 

-0.33 

-0.29 

-0.20 

-0.06 

-0.23 

0.21 

0.03 

-0.03 

-0.09 

6.  2.10 

6.05 

-0.01 

-0.04 

0.17 

0.01 

-0.00 

-0.01 

-0.00 

-0.00 

0.12 

0.05 

-0.02 

0.03 

6.  2.  6 

0.05 

-0.07 

-0.13 

-0.42 

-0.72 

-0.47 

-0.31 

-0.13 

-0.17 

0.14 

0.01 

0.01 

-0.18 

7.  2 

0.08 

-0.11 

-0.17 

-0.77 

-1.33 

-0.67 

-0.39 

-0.35 

-0.16 

0.05 

0.14 

0.22 

-0.29 

8.  2 

0.10 

-0.10 

-0.31 

-1.06 

-1.66 

-0.85 

-0.55 

-0.50 

-0.26 

-0.02 

0.14 

0.22 

-0.40 

8.  1 

0.08 

-0.10 

-0.30 

-1.22 

-1.81 

-0.95 

-0.60 

-0.58 

-0.47 

-0.02 

0.17 

0.28 

-0.46 

7.  1 

0.06 

-0.11 

-0.16 

-0.92 

-1.48 

-0.77 

-0.44 

-0.42 

-0.37 

0.04 

0.17 

0.28 

-0.34 

9.12.3.9  . 

0.09 

-0.04 

-0.43 

-0.81 

-1.14 

-0.71 

-0.55 

-0.43 

-0.50 

0.03 

0.05 

-0.00 

-0.37 

7.  2.2(9) 

0.10 

0.02 

-0.12 

0.24 

0.13 

-0.06 

-0.13 

-0.02 

-0.14 

0.20 

0.02 

-0.14 

0.01 

Dail.ext. 

-0.10 

0.04 

0.03 

-0.17j-0.06 

0.06 

0.06 

-0.07 

-0.19 

-0.02 

0.03 

-0.02 

-0.09 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

80 


LXXV. 

NORWAY.  —  BOSSEKOP.     Lat.  69°  58'  N.     Long.  22°  E.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 


80  Days 

Hour.             Jan. 

Feb. 

March. 

April. 

Sept. 

Oct. 

Nov. 

Dec. 

without 
Sun. 

A.M.  2 

-0.26 

0.36 

1.37 

1.20 

0.66 

0.04 

0.35 

0.04 

4 

-0.11 

0.30 

1.78 

.  .  . 

1.01 

0.53 

-0.03 

0.42 

0.10 

6            0.00 

0.50 

1.90 

... 

1.22 

0.73 

0.04 

0.28 

0.08 

8            0.09 

0.26 

1.18 

0.36 

0.62 

0.41 

0.07 

0.10 

0.02 

10 

-0.13 

-0.19 

-1.09 

-0.85 

-1.01 

-0.29 

-0.15 

-0.14 

-0.19 

Noon. 

0.18 

-0.79 

-2.39 

-1.29 

-1.66 

-1.05 

-0.13 

-0.09 

-0.03 

2 

0.20 

-1.02 

-2.85 

-1.22 

-1.69 

-1.02 

-0.09 

-0.34 

-0.10 

4 

0.30 

-0.11 

-2.38 

-0.82 

-1.54 

-0.50 

0.09 

-0.38 

0.06 

6 

0.18 

0.06 

-0.57 

-0.10 

-0.27 

-0.17 

0.18 

-0.23 

0.09 

8            0.12 

0.16 

0.46 

0.70 

0.39 

0.09 

0.14 

-0.26 

0.02 

10          -0.34 

0.21 

1.19 

1.44 

0.79 

0.13 

-0.03 

0.14 

-0.10 

12          -0.27 

0.22 

1.39 

1.83 

0.89 

0.49 

-0.13 

0.17 

-0.10 

Mean. 

-7.67 

-6.39 

-7.55 

-0.77 

5.91 

-1.62 

-6.55 

-5.66 

-7.66 

LXXV. 

NORWAY.  —  BOSSEKOP.     Lat.  69°  58'  N.     Long.  22°  E.  Greenw. 

Centigrade  Degrees  . 

80  Days 

Hour. 

Jan. 

Feb. 

March. 

April. 

Sept. 

Oct. 

Nov. 

Dec. 

•without 
Sun. 

A.M.  2 

-0.32 

0.45 

1.71 

... 

1.50 

0.82 

0.05 

0.44 

0.05 

4 

-0.14 

0.37 

2.22 

.  .  • 

1.26 

0.66 

-0.04 

0.52 

0.12 

6 

0.00 

0.62 

2.37 

.  .  . 

1.52 

0.91 

0.05 

0.35 

0.10 

8 

0.11 

0.32 

1.47 

0.45 

0.77 

0.51 

0.09 

0.12 

0.02 

10 

-0.16 

-0.24 

-1.36 

-1.06 

-1.26 

-0.36 

-0.19 

-0.17 

-0.24 

Noon. 

0.22 

-0.99 

-2.98 

-1.62 

-2.07 

-1.31 

-0.16 

-0.11 

-0.04 

2 

0.25 

-1.27 

-3.56 

-1.52 

-2.11 

-1.27 

-0.11 

-0.42 

-0.12 

4 

0.37 

-0.14 

-2.97 

-1.02 

-1.92 

-0.62 

0.11 

-0.47 

0.07 

6 

0.22 

0.07 

-0.71 

-0.12 

-0.34 

-0.21 

0.22 

-0.29 

0.11 

S 

0.15 

0.20 

0.57 

0.87 

0.49 

0.11 

0.17 

-0.32 

0.02 

10 

-0.42 

0.26 

1.48 

1.80 

0.99 

0.16 

-0.04 

0.17 

-0.12 

12 

-0.34 

0.27 

1.73 

2.29 

1.11 

0.61 

-0.16 

0.21 

-0.12 

Mean. 

-9.59 

-7.99 

-9.44 

-0.96 

7.39 

-2.02 

-8.19 

-7.07 

-9.57 

E 


81 


HOURLY    CORRECTIONS 


FOR 


PERIODIC    VARIATIONS 


AFRICA.  — AUSTRALIA. 


E  S3 


LXXVI. 

AFRICA.  —  ST.  HELENA.     Lat.  15°  55'  S.    Long.  5°  43'  W.  Greenw. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Reaumur. 


Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn. 

0.76 

0.70 

0.63 

0.58 

0.52 

0.43 

0.48 

0.43 

0.52 

0.62 

0.71 

0.73 

0.59 

1 

0.85 

0.76 

0.71 

0.66 

0.61 

0.48 

0.53 

0.48 

0.56 

0.71 

0.78 

0.81 

0.66 

2 

0.93 

0.84 

0.77 

0.70 

0.66 

0.54 

0.56 

0.53 

0.62 

0.78 

0.86 

0.90 

0.72 

3 

1.03 

0.92 

0.86 

0.76 

0.73 

0.59 

0.62 

0.63 

0.69 

0.86 

0.95 

0.98 

0.80 

4 

1.06 

1.00 

0.92 

0.81 

0.80 

0.65 

0.66 

0.66 

0.76 

0.91 

0.99 

1.02. 

0.85 

5 

1.11 

1.04 

0.93 

0.86 

0.83 

0.67 

0.69 

0.73 

0.79 

0.94 

1.02 

1.08 

0.89 

6 

1.15 

1.07 

0.98 

0.93 

0.83 

0.68 

0.72 

0.74 

0.83 

0.99 

1.07 

1.09 

0.92 

7 

1.16 

1.08 

0.97 

0.94 

0.89 

0.71 

0.75 

0.79 

0.81 

0.96 

1.03 

1.06 

0.93 

8 

0.95 

0.99 

0.78 

0.85 

0.88 

0.69 

0.72 

0.72 

0.72 

0.77 

O.SO 

0.98 

0.82 

9 

0.53 

0.63 

0.52 

0.49 

0.46 

0.42 

0.41 

0.43 

0.42 

0.38 

0.40 

0.48 

0.46 

10 

-0.05 

0.06 

-0.07 

-0.04 

-0.08 

-0.04 

-0.04 

-0.02 

-0.05 

-0.17 

-0.16 

-0.09, 

-0.06 

11 

-0.62 

-0.55 

-0.49 

-0.51 

-0.47 

-0.40 

-0.40 

-0.40 

-0.55 

-0.66 

-0.67 

-0.56 

-0.52 

Noon. 

-1.14 

-1.06 

-0.95 

-1.00 

-0.96 

-0.73 

-0.76 

-0.80 

-0.92 

-1.11 

-1.12 

-  .08 

-0.97 

1 

-1.64 

-1.46 

-1.28 

-1.31 

-1.20 

-1.04 

-1.06 

-1.12 

-1.25 

-1.45 

-1.60 

-  .52 

-1.33 

2 

-1JB1 

-1.67 

-1.48 

-1.46 

-1.32 

-1.20 

-1.26 

-1.25 

-1.42 

-1.67 

-1.80 

-  .80 

-1.51 

3 

-1.76 

-1.78 

-1.62 

-1.50 

-1.35 

-1.18 

-1.24 

-1.31 

-1.38 

-1.64 

-1.84 

-  .82 

-1.54 

4 

-1.69 

-1.66 

-1.54 

-1.35 

-1.24 

-1.03 

-1.12 

-1.13 

-1.20 

-1.37 

-1.64 

-  .76 

-1.39 

5 

-1.48 

-1.38 

-1-.27 

-1.06 

-0.94 

-0.78 

-0.84 

-0.86 

-0.91 

-0.99 

-1.24 

-  .38 

-1.09 

6 

-0.92 

-0.91 

-0.83 

-0.61 

-0.47 

-0.40 

-0.44 

-0.42 

-0.43 

-0.48 

-0.66 

-0.82 

-0.62 

7 

-0.27 

-0.33 

-0.28 

-0.11 

^0.23 

-0.03 

-0.07 

-0.03 

0.01 

0.02 

-0.04 

-0.18 

-0.13 

8 

0.26 

0.21 

.0.18 

0.20 

-0.12 

0.17 

0.13 

0.15 

0.23 

0.29 

0.32 

0.30 

0.19 

9 

0.47 

0.44 

0.34 

0.34 

0.14 

0.26 

0.23 

0.25 

0.32 

0.26 

0.48 

0.48 

0.33 

10 

0.60 

0.55 

0.48 

0.44 

0.41 

0.32 

0.33 

0.32 

0.38 

0.49 

0.56 

0.58 

0.46 

11 

0.69 

0.64 

0.55 

0.51 

0.45 

0.39 

0.38 

0.38 

0.46 

0.55 

0.64 

0.67 

0.53 

Mean. 

14.21 

15.04 

15.22 

14.93 

13.80 

12.48 

11.55 

11.19 

11.14 

11.66 

12.37 

13.23 

LXXVII. 

AFRICA.  —  CAPE  OF  GOOD  HOPE.    .Lat.  33°  56'  S.    Long.  19°  39'  E.  Gr.—  DOVE. 

Degrees  of  Reaumur. 

Hour 

Jan. 

Feb. 

March,  i  April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn. 

1.69 

1.50 

1.51      1.37 

.00 

0.88 

1.04 

0.85 

1.07 

1.45 

1.62 

1.85 

1.32 

1 

2.80 

1.64 

1.64 

1.49 

.07 

1.01 

.20 

1.03 

1.25 

1.62 

1.79 

2.01 

1.55 

2 

1.89 

1.74 

1.81 

1.61 

.14 

1.09 

.33 

1.14 

1.39 

1.72 

1.98 

2.16 

1.58 

3 

2.01 

1.92 

1.92 

1.70 

.24 

1.16 

.43 

1.23 

1.54 

1.82 

2.12 

2.30 

1.70 

4 

2.10 

2.00 

2.05     1.88 

.34 

1.30 

.53 

1.37 

1.63 

1.92 

2.21 

2.42 

1.81 

5 

1.96 

2.13 

2.13|    1.93 

I 

.46 

1.42 

.59 

1.53 

1.59 

1.93 

1.92 

2.01 

1.80 

,6 

1.06 

1.53 

1.97     1.98 

.59 

1.48 

1.73 

1.55 

1.62 

1.26 

0.85 

0.86 

1.46 

7 

0.15 

0.70 

.  1.21     1.39 

.41 

1.47 

1.57 

1.22 

0.81 

0.39 

-0.02 

-0.20 

0.84 

8 

-0.53 

-0.01 

0.16 

0.36 

0.53 

0.86 

0.77 

0.64 

-0.06 

-0.46 

-0.67 

-0.81 

0.06 

9 

-1.10 

-0.80 

-0.76 

-0.68 

-0.39 

-0.12 

-0.24 

-0.42 

-0.82 

-1.24 

-1.25 

-1.36 

-0.77 

10 

-1.72 

-1.65 

-1.66  -1.48 

-1.10 

-0.90 

-1.09 

-1.08 

-1.41 

-1.82 

-1.80 

-1.9.0 

-1.47 

11 

-2.23 

-2.31 

-2.37  -2.10 

-1.64  -1.46  -1.72 

-1.63 

-1.85 

-2.25 

-2.24 

-2.25 

-2.00 

E 


The  numbers  without  sign  must  be  added  ;  those  with  the  sign  —  must  be  subtracted. 

85 


LXXVII. 

AFRICA.  —  CAPE  OF  GOOD  HOPE,  Continued. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation  to  obtain  the  true 
Mean  Temperatures  of  the  respective  Days,  Months,  and  of  the  Year.  —  DOVE. 

Degrees  of  Beaumur. 


Ilour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept.       Oct. 

NOT. 

Dec. 

Year. 

Noon. 

-2.48 

-2.72 

-2.66 

-2.56 

-2.09 

-1.92 

-2.11 

-1.88 

-2.15 

-2.45 

-2.46 

-2.52 

-2.33 

1 

-2.54 

-2.74 

-2.95 

-2.81 

-2.20 

-2.07 

-2.33 

-2.04 

-2.23 

-2.55 

-2.48 

-2.61 

-2.46 

2 

-2.42 

-2.54 

-2.86 

-2.79 

-2.14 

-2.06 

-2.33 

-1.97 

-2.18 

-2.44  -2.30 

-2.44 

-2.37 

3 

-2.16 

-2.20 

-2.51 

-2.42 

-1.84 

-1.86 

-2.13 

-1.77 

-1.82 

-2.08  -2.01 

-2.16 

-2.08 

4 

-1.75 

-1.70 

-1.78 

-1.75 

-1.28 

-1.28 

-1.49 

-1.32 

-1.28 

-1.52  -1.66 

-1.90 

-1.56 

5 

-1.21 

-1.09 

-1.03 

-0.71 

-0.61 

-0.64 

-0.76 

-0.57 

-0.56 

-0.71 

-1.05 

-1.28 

-0.85 

6 

-0.16 

-0.13 

-0.10 

-0.03 

-0.21 

-0.29 

-0.33 

-0.17 

0.00 

0.20 

-0.01 

-0.15 

-0.12 

7 

0.65 

0.54 

0.35 

0.22 

0.09 

-0.05 

-0.03 

0.12 

0.30 

0.57 

0.60 

0.63 

0.33 

8 

0.95 

0.79 

0.61 

0.48 

0.36 

0.19 

0.26 

0.32 

0.51 

0.86 

0.92 

0.96 

0.60 

9 

1.14 

1.00 

0.92 

0.73 

0.54 

0.40 

0.48 

0.46 

0.69 

1.09 

1.10 

1.20 

0.81 

10 

1.30 

1.14 

1.14 

1.00 

0.78 

0.61 

0.69 

0.65 

0.97 

1.26 

1.31 

1.46 

1.03 

11 

1.55 

1.32 

1.29 

1.22 

0.95 

0.81 

0.91 

0.76 

1.02 

1.44 

1.48 

1.67 

1.20 

Mean. 

15.81 

15.96 

15.00 

13.61 

11.38 

9.84 

9.96    10.06 

11.01    12.43 

13.54 

14.82 

LXXVIII. 

AUSTRALIA.  —  HOBARTON.     Lett.  42°  53'  S.     Long.  147°  21'  E.  Gr.  —  DOVE. 

Degrees  of  Reaumur. 

Hour. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

Midn. 

2.34 

1.95 

1.78 

.31 

0.88 

0.66 

0.72 

.10 

1.51 

1.99 

2.44 

2.45 

1.59 

1 

2.59 

2.17 

1.99 

.41 

.03 

0.76 

0.86 

.36 

1.71 

2.19 

2.67 

2.76 

1.79 

2 

2.89 

2.32 

2.19 

.62 

.11 

0.88 

.01 

.43 

1.93 

2.45 

2.77 

2.95 

1.96 

3 

3.09 

2.53 

2.39 

.75 

.23 

0.97 

.16 

.58 

2.06 

2.68 

2.98 

3.24 

2.14 

4 

3.20 

2.68 

2.49 

.85 

.31 

.15 

.28 

.69 

2.20 

2.80 

3.11 

3.38 

2.26 

5 

3.33 

2.82 

2.54 

.99 

.44 

.15 

.40 

.82 

2.32 

2.85 

2.99 

3.13 

2.31 

6 

2.62 

2.59 

2.64 

2.11 

.55 

.29 

.50 

.91 

2.34 

2.60 

2.24 

2.24 

2.14 

7 

1.48 

1.75 

2.10 

2.00 

.60 

.37 

.50 

.90 

1.84 

1.61 

1.16 

1.03 

1.61 

8 

0.27 

0.68 

1.08 

1.30 

.27 

.26 

.31 

.32 

0.93 

0.41 

0.01 

-0.24 

0.80 

9 

-0.88 

-0.56 

-0.17 

0.24 

0.45 

0.60 

0.60 

0-44 

-0.21 

-0.70 

-1.13 

-1.27 

-0.22 

10 

-1.92 

-1.61 

-1.28 

-0.85 

-0.46 

-0.18 

-0.21 

-0.52 

-1.21 

-1.68 

-2.10 

-2.16 

-1.18 

11 

-2.75 

-2.34 

-2.24 

-1.78 

-1.29 

-0.96 

-1.01 

-1.53 

-2.09 

-2.54 

-2.89 

-2.85 

-2.02 

Noon. 

-3.51 

-3.22 

-3.03 

-2.58 

-2.00 

-1.67 

-1.67 

-2.28 

-2.70 

-3.10 

-3.43 

-3.36 

-2.71 

1 

-3.82 

-3.52 

-3.48 

-2.95 

-2.42 

-2.08 

-2.17 

-2.73 

-3.14  -3.48 

-3.72 

-3.67 

-3.10 

2 

-3.91 

-3.54 

-3.63 

-3.11 

-2.53 

-2.22 

-2.38 

-2.91 

-3.25  -3.48 

-3.67 

-3.56 

-3.18 

3 

-3.60 

-3.36 

-3  43 

-2.87 

-2.32 

-2.02 

-2.23 

-2.71 

-3.10 

-3.32 

-3.33-3.45 

-2.98 

4 

-3.20 

-2.94 

-2.92 

-2.23 

-1.69 

-1.43 

-1.73 

-2.20 

-2.53 

-3.04 

-3.12-3.12 

-2.51 

5 

-2.57 

-2.22 

-2.02 

-1.35 

-0.92 

-0.73 

-1.01 

-1.37 

-1.59 

-2.02 

-2.30 

-2.56 

-1.72 

6 

-1.38 

-1.04 

-084 

-0.56 

-0.36 

-0.25 

-0.48 

-0.64 

-0.65 

-0.80 

-1.01 

-1.38 

-1.78 

7 

-0.13 

-0.20 

-0.04 

-0.05 

0.01 

0.00 

0.12 

-0.13 

0.01 

0.05 

0.20 

-0.09 

-0.02 

8 

0.82 

0.68 

0.45 

0.32 

0.27 

0.24 

0.14 

0.21 

0.46 

0.55 

0.90 

0.89 

0.49 

9 

1.31 

1.13 

0.82 

0.57 

0.42 

0.24 

0.34 

0.57 

0.79 

1.00 

'   1.41 

1.51 

0.84 

10 

1.71 

1.47 

1.19 

0.84 

0.62 

0.40 

0.50 

0.79 

1.08 

1.34 

1.75 

1.91 

1.13 

11 

2.05 

1.77 

1.47 

1.06 

0.77 

0.54 

0.64 

0.93 

1.31 

1.63 

2.05 

2.25 

1.37 

Mean. 

13.38 

13.96    11.96 

9.41 

7.69 

5.93 

5.21 

6.24 

7.97 

9.39 

11.38 

12.95 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

86 


CORRECTIONS    FOR   TEMPERATURE. 


MONTHLY   AND    YEARLY 
CORRECTIONS    FOR    NON-PERIODIC    VARIATIONS, 


TABLES 


FOR  REDUCING  THE  MONTHLY  AND  YEARLY  MEANS  OP  SINGLE  YEARS 
TO  THE  MEANS  DERIVED  FROM  A  SERIES  OF  YEARS. 


E  87 


TABLES 

FOR  REDUCING  THE  MONTHLY  AND  YEARLY  MEANS  OF  SINGLE  YEARS  TO  THE 
MEANS  DERIVED  FROM  A  SERIES  OF  YEARS. 


OBSERVATION  shows  that  the  monthly  and  annual  mean  temperature  of  a  place 
somewhat  varies  from  year  to  year.  No  law,  however,  has  been  as  yet  discovered 
as  to  the  course  of  these  oscillations.  It  follows  that  the  means  derived  from  observa- 
tions carried  on  during  a  single  year  are  but  approximations  to  the  true  means. 
These  last  must  be  obtained  from  observations  made  for  a  series  of  years,  during 
which  these  irregular  variations  become  insensible  by  compensating  each  other  ;  and 
it  is  obvious  that  their  accuracy  increases  with  the  number  of  years  which  compose 
the  series. 

Professor  Dove,  having  proved  by  his  researches  that  these  abnormal  temperatures 
above  and  below  the  average  of  a  whole  month,  or  of  a  year,  are  apt  to  be  felt  simul- 
taneously on  extensive  tracts  of  country,  concluded  that  the  means  of  a  single  year 
could  be  made  available  for  obtaining  the  true  means  of  the  place,  by  being  corrected 
for  the  non-periodic  variations  by  means  of  normal  stations  in  the  same  meteorological 
region,  in  which  those  elements  had  been  more  accurately  determined  by  the  obser- 
vations of  a  long  series  of  years.  Comparing,  namely,  the  means  of  a  given  year 
with  the  means  derived  from  the  whole  series,  we  find  a  difference  in  -f-  or  — ,  which, 
applied,  with  reverse  signs,  to  the  means  of  the  same  year  in  the  neighboring  station 
to  be  corrected,  will  reduce,  with  a  good  degree  of  probability,  the  means  of  that 
particular  year  to  the  means  which  would  have  been  obtained  from  a  long  series  of 
years  similar  to  that  of  the  normal  station. 

The  following  tables,  LXXIX.  to  XCVIL,  have  been  selected  from  those  given  by 
Dove  in  his  five  papers  on  the  non-periodic  variations  of  the  atmospheric, tempera- 
ture, to  be  found  in  the  Memoirs  of  the  Academy  of  Sciences  of  Berlin  for  the  years 
1838,  1839,  1842,  1848,  and  1853,  to  which  we  must  refer  for  further  details.  They 
furnish  normal  stations  for  various  latitudes  ;  the  columns  contain  the  corrections  for 
every  month,  viz.  the  differences,  with  reverse  signs,  between  the  monthly  means  in 
the  year  indicated  in  the  first  and  last  columns,  and  the  means  derived  from  the 
whole  series,  which  are  contained  in  the  line  at  the  bottom. 


LXXIX. 

Region  of  the  MONSOONS.  —  MADRAS. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  fhe  Means  derived 

from  Series  of  Years. 

Desrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

0 

o 

0 

o 

0 

0 

c 

0 

0 

0 

0 

o 

1796 

0.00 

0.24 

0.00 

0.36 

-0.10 

-1.48 

-1.16 

-1.15 

-0.31 

-0.28 

-0.47 

-0.51 

-  1796 

1797 

.  .  . 

.  . 

0.66 

0.53 

0.39 

0.56 

0.09 

0.85 

-0.09 

-0.33 

0.16 

-0.02 

1797 

1798 

-0.13 

1.12 

0.40 

.  . 

.  . 

0.39 

0.53 

-031 

0.27 

0.56 

-0.16 

0.20 

1798 

1799 

-0.13 

-0.08 

0.62 

0.36 

0.26 

-0.06 

-1.20 

0.00 

-0.36 

0.38 

-1.44 

0.25 

1799 

1800 

0.40 

0.41 

0.57 

1.20 

-0.23 

-0.50 

-1.02 

-0.40 

-0.58 

0.20 

0.47 

-0.60 

1800 

1801 

•0.4J 

0.01 

1.77 

.  . 

.  . 

-0.59 

-0.67 

0.63 

-0.49 

-0.02 

-0.20 

0.25 

1801 

1802 

0.41 

0.86 

1.77 

1.02 

-0.36 

0.65 

0.58 

-0.04 

1.60 

0.43 

-0.02 

-0.28 

1802 

1803 

0.22 

0.24 

0.80 

0.53 

-332 

0.08 

0.18 

0.80 

0.80 

0.38 

0.33 

0.65 

1803 

1804 

1.64 

1.48 

0.75 

1.38 

0.70 

0.70 

1.24 

0.00 

0.58 

0.38 

0.91 

0.29 

1804 

1805 

0.27 

0.41 

0.66 

-0.36 

0.61 

0.52 

-0.76 

-0.22 

-0.27 

-0.33 

0.69 

0.65 

1805 

1806 

0.00 

-0.39 

-009 

0.09 

-0.41 

-1.61 

0.00 

-0.13 

1.07 

0.47 

0.96 

0.12 

1806 

1807 

0.22 

-1.54 

-3.20 

-5.47 

-1.79 

0.48 

1.20 

-0.17 

-0.09 

-0.64 

-0.20 

0.78 

1807 

1813 

0.80 

0.37 

0.13 

0.96 

1.12 

-0.32 

0.44 

-0.22 

-0.18 

0.25 

-0.38 

-1.04 

1813 

1814 

-0.36 

-0.39 

-0-58 

0.04 

-2.99 

1.10 

1.38 

0.29 

-0.22 

0.07 

-0.20 

-0.37 

1814 

1815 

-0.98 

0.32 

-0.67 

2.00 

1.55 

-1.39 

-0.98 

0.27 

0.31 

-0.73 

-0.91 

-0.82 

1815 

1816 

-1.09 

-1.76 

-1.56 

-0.93 

0.44 

0.39 

-0.44 

-0.71 

-0.67 

-0.20 

0.33 

-0.51 

1816 

1817 

-0.58 

-0.70 

-0.67 

-0.62 

0.12 

-0.19 

0.67 

0.29 

-0.71 

-0.55 

-0.96 

0.52 

1817 

1818 

0.22 

0.32 

-0.80 

-0.04 

1.41 

0.65 

-1.33 

-2.00 

-0.18 

-0.55 

-0.56 

-0.37 

1818 

1819 

-1.78 

-1.28 

-0.76 

-0.13 

0.4S 

0.88 

0.44 

0.98 

-0.31 

0.03 

0.78 

0.16 

1819 

1820 

-0.67 

-0.30 

-0.85 

0.5^ 

-1.16 

-0.32 

0.18 

0.23 

-0.09 

0.47 

0.69 

0.47 

1820 

1821 

1.02 

0.64 

l.Oti 

-1.51 

0.26 

0.08 

0.58 

0.94 

-0.04 

-0.02 

0.20 

0.20 

1821 

Means. 

19.19 

20.07 

21.30 

22.41 

24.41 

24.96 

23.84 

23.43 

23.03 

22.16 

20.74 

19.48 

Means. 

1822 

-0.36 

0.37 

0.41 

-0.28 

0.07 

-0.95 

-0.76 

0.72 

-0.37 

-0.70 

-0.35 

-0.19 

1822 

1823 

0.31 

0.37 

-0.21 

0.30 

0.15 

0.29 

0.22 

0.17 

-0.60 

0.72 

0.27 

0.97 

1823 

1824 

0.71 

0.59 

0.27 

0.52 

-0.02 

0.60 

1.55 

0.88 

1.36 

-0.93 

0.14 

0.26 

1824 

1825 

-0.09 

0.37 

-0.21 

0.12 

0.24 

-0.29 

0-04 

-0.36 

0.03 

0.32 

0.59 

-0.59 

1825 

1826 

0.80 

0.24 

0.45 

0.92 

0.78 

-1.17 

0.04 

-0.36 

0.25 

0.81 

0.36 

0.30 

1826 

1827 

-0.09 

-0.29 

-0.17 

0.17 

-1.27 

-0.46 

-0.01 

-0.09 

-0.15 

-0.13 

0.54 

0.98 

1827 

1828 

1.07 

0.51 

-0.57 

-0.59 

-0.42 

0.34 

-0.23 

0.04 

-0.60 

-0.17 

0.81 

0.21 

1828 

1829 

0.09 

-0.69 

-0.35 

0.08 

-0.11 

0.16 

-0.89 

-0.01 

0.16 

0.54 

0.23 

0.12 

1829 

1830 

-0.27 

-0.74 

0.01 

-0.32 

-2.73 

-0.15 

-0.36 

-0.23 

0.25 

1.12 

0.68 

0.53 

1830 

1831 

0.31 

1.49 

1.66 

0.48 

1.89 

1.36 

0.04 

0.67 

0.70 

0.41 

0.41 

0.53 

1831 

1832 

-0.49 

-0.29 

1.26 

1.73 

2.51 

2.65 

1.64 

2.40 

0.34 

-0.25 

0.46 

.  . 

1832 

1833 

0.36 

0.91 

-0.19 

0.97 

0.83 

0.83 

1.33 

0.40 

0.16 

0.41 

0.19 

1.06 

1833 

1834 

0.18 

0.60 

0.55 

-0.58 

1.31 

0.12 

-0.98 

-0.18 

-0.15 

-0.03 

0.01 

-0.01 

1834 

1835 

-0.66 

-0.73 

-0.57 

-1.07 

-0.24 

-0.86 

-0.67 

-0.45 

-0.46 

-0.74 

-0.48 

-0.94 

1835 

1836 

-0.75 

-0.73 

-1.41 

-0.72 

0.60 

0.12 

-0.58 

-1.29 

-0.24 

0.15 

-0.92 

-1.03 

1836 

1837 

-0.31 

-0.02 

0.06 

-0.63 

-1.17 

-0.41 

-0.40 

-0.05 

0.03 

-0.34 

-0.17 

-0.85 

1837 

1838 

-1.24 

-0.69 

-0.30 

0.04 

-0.33 

-0.24 

0.75 

-0.05 

0.65 

-0.12 

-0.57 

-0.41 

1838 

1839 

0.36 

-0.11 

-0.12 

-0.45 

-0.15 

-0.41 

-0.49 

-0.93 

-0.68 

0.68 

-0.83 

0.71 

1839 

1840 

-0.13 

-0.42 

-0.70 

0.17 

0.29 

0.25 

-0.45 

0.27 

-0.77 

0.19 

-1.14 

-0.32 

1840 

1841 

0.05 

-0.16 

-0.17 

-0.58 

-1.17 

-0.81 

0.35 

-0.71 

0.74 

-1.28 

-0.34 

-0.27 

1841 

1842 

-0.09 

-0.51 

-0.08 

-0.49 

0.47 

0.07 

0.00 

0.09 

-0.86 

-0.30 

-0.30 

-0.23 

1842 

1843 

0.23 

-0.02 

-0.03 

0.22 

-1.53 

-1.04 

-0.22 

0.44 

0.16 

-0.52 

0.23 

-0.32 

1843 

Means. 

20.53 

21.31 

22.92 

24.27 

25.62 

25.35 

24.31 

23.73 

23.70 

22.92  21.32 

20.67 

Means. 

The  numbers  without  sign  must  be  subtracted;  those  with  the  sign  —  must  be  added. 

90 


LXXX. 

SICILY.  —  PALERMO. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

Apri,. 

JVIay. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

0 

0 

0 

o 

o 

o 

0 

o 

0 

0 

o 

0 

1791 

—0  44 

—0.32 

—0.52 

0.95 

—0.67 

—0.36 

1.73 

0.00 

1791 

1792 

1.18 

0.51 

0.09 

0.12 

-0.48 

1.12 

-1.01 

-1.65 

-0.63 

0.22 

-0.83 

-0.96 

1792 

1793 

-1.68 

-0.38 

-0.33 

-1.63 

-2.04 

-1.83 

-1.28 

-1.14 

0.86 

-0.54 

-0.25 

0.44 

1793 

1794 

-0.04 

-0.69 

-0.51 

0.59 

-0.79 

-1.92 

-0.81 

-0.48 

-0.14 

-0.69 

-0.29 

-0.47 

1794 

1795 

-1.62 

1.27 

0.78 

-0.10 

0.12 

-0.59 

-1.12 

-0.34 

-0.72 

-0.23 

0.18 

1795 

1796 

0.78 

0.58 

-0.84 

-1.56 

-0.19 

-0.59 

-0.39 

-0.01 

0.40 

1.11 

0.00 

0.98 

1796 

1797 

-0.24 

-0.29 

-1.15 

-0.19 

-0.24 

-0.70 

-0.56 

0.39 

0.15 

0,13 

-0.12 

0.16 

1797 

1798 

0.03 

0.20 

0.78 

-0.90 

-0.99 

-0.45 

0.72 

-0.41 

0.00 

-1.00 

1.97 

0.31 

1798 

1799 

-1.75 

1.38 

0.52 

0.64 

-$.35 

0.08 

0.37 

0.75 

0.48 

1.40 

-0.32 

0.40 

1799 

1800 

2.27 

2.96 

0.69 

2.46 

0.63 

-0.14 

0.26 

-0.41 

-0.58 

0.02 

-0.18 

0.09 

1800 

1801 

-0.11 

0.76 

1.45 

0.24 

-0.10 

-0.16 

1.26 

-0.56 

-0.07 

1.04 

1.04 

1.64 

1801 

1802 

0.09 

-0.16 

0.47 

-1.01 

-0.30 

2.50 

0.17 

0.72 

0.42 

0.77 

1.51 

1.40 

1802 

1803 

1.67 

-1.69 

.  . 

2.08 

-1.08 

0.66 

0.04 

0.52 

0.31 

-0.65 

1.42 

0.42 

1803 

1804 

4.63 

-0.82 

0.16 

0.21 

0.14 

1.30 

1.12 

0.12 

-0.14 

0.31 

1.22 

1.40 

1804 

1805 

0.80 

0.69 

-0.68 

-1.59 

-1.59 

1.21 

-0.65 

-0.34 

-1.52 

0.06 

-1.85 

-1.02 

1805 

1806 

-1.15 

0.64 

-0.04 

-0.50 

0.41 

0.10 

-0.14 

-0.85 

-1.16 

-0.43 

-0.14 

0.40 

1806 

1807 

-1.06 

0.16 

0.34 

-1.21 

0.74 

0.90 

1.37 

0.92 

2.80 

1.26 

1.95 

-0.07 

1807 

1808 

-0.24 

-1.22 

-0.86 

-1.36 

-0.48 

-0.43 

0.88 

0.04 

2.42 

-1.92 

-0.29 

-2.31 

1808 

1809 

0.87 

-0.31 

0.23 

-0.50 

-0.48 

0.86 

1.46 

-0.23 

-0.67 

-1.67 

-1.36 

-0.98 

1809 

1810 

0.01 

-0.27 

2.49 

0.28 

0.50 

-0.63 

-0.54 

-0.19 

-0.29 

-0.67 

0.06 

-0.91 

1810 

1811 

-0.15 

0.69 

-0.91 

0.24 

0.43 

1.46 

0.97 

0.26 

0.04 

0.95 

0.00 

-0.76 

1811 

1812 

-1.51 

0.40 

0.00 

-0.39 

-0.61 

0.15 

-1.32 

-0.21 

-0.69 

-0.16 

,0.35 

-0.18 

1812 

1813 

-1.51 

-1.02 

-0.80 

-0.52 

0.79 

0.32 

-0.92 

-1.25 

-1.00 

1.31 

0.04 

-1.18 

1813 

1814 

0.54 

-3.04 

-0.88 

0.04 

-1.46 

-0.59 

-0.96 

-0.56 

-2.03 

-0.49 

-0.52 

-0.42 

1814 

1815 

-0.46 

0.07 

0.29 

0.90 

0.61 

-0.63 

-1.12 

-2.01 

-0.78 

0.22 

0.08 

-0.78 

1815 

1816 

-0.40 

-0.31 

-0.71 

-0.54 

0.05 

-1.94 

-0.65 

-0.48 

-0.80 

-1.09 

-0.63 

-1.24 

1816 

1817 

-0.11 

-0.09 

-0.15 

.  . 

.  . 

0.32 

-0.39 

0.46 

-0.34 

0.11 

-0.47 

-0.02 

1817 

1818 

-0.66 

0.87 

1.21 

0.19 

-1.10 

-0.25 

-0.45 

0.24 

-0.78 

0.33 

0.62 

1818 

1819 

-1.02 

0.18 

0.72 

0.97 

-0.12 

-0.21 

-0.28 

-0.34 

-0.32 

0.82 

1.11 

0.82 

1819 

1820 

1.89 

-0.11 

-0.97 

0.37 

2.03 

0.68 

0.48 

-0.65 

0.29 

1820 

1821 

1.92 

-0.76 

0.49 

0.50 

0.85 

-0.74 

-0.30 

-0.21 

0.51 

-0.74 

-0.72 

0.69 

1821 

1822 

-1.28 

-1.11 

-0.53 

.  . 

0.68 

2.97 

1.48 

1.46 

1.88 

1.51 

0.06 

0.18 

1822 

1823 

0.52 

1.78 

-0.80 

0.28 

0.99 

0.30 

-0.36 

0.35 

-0.34 

-0.76 

-1.63 

-0.53 

1823 

1824 

-0.91 

0.42 

-1.04 

-1.01 

1.25 

-0.25 

-0.70 

1.86 

0.13 

1.51 

0.64 

0.51 

1824 

1825 

-1.04 

-1.02 

-0.17 

0.12 

0.30 

-0.45 

-0.10 

0.46 

0.55 

-1.00 

-0.05 

1.67 

1825 

1826 

-0.88 

0.56 

-0.29 

-0.59 

-1.08 

-0.74 

0.39 

0.52 

1.35 

0.46 

-0.87 

-0.24 

1826 

1827 

0.07 

0.83 

0.82 

-0.51 

0.18 

-1.30 

0.80 

1.33 

-0.73 

0.50 

-1.76 

-0.04 

1827 

1828 

-0.16 

0.20 

0.23 

0.29 

1.99 

"  1.28 

2.48 

1.10 

0.74 

-0.34 

0.06 

-0.37 

1828 

1829 

0.79 

-1.90 

1.12 

2.49 

-0.09 

-0.47 

0.16 

-0.12 

0-41 

-0.38 

-0.35 

-0.16 

1829 

Means. 

8.35 

8.27 

9.40 

11.52 

14.35 

17.12 

19.25 

19.48 

17.60 

14.78 

11.69 

9.44 

Means. 

The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added 

91 


LXXXI. 

NORTH  ITALY.  —  MILAN. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

o 

0 

o 

0 

0 

o 

0 

0 

0 

o 

0 

0 

1763 

-1.32 

1.58 

-0.60 

0.27 

-2.28 

-0.79 

0.68 

1.11 

-1.11 

-1.69 

-0.56 

1.02 

1763 

1764 

1.68 

1.98 

-0.70 

-0.63 

1.32 

0.91 

-0.12 

-1.29 

-1.21 

-1.19 

-0.26 

1.52 

1764 

1765 

3.88 

-0.92 

0.60 

0.47 

-1.08 

0.11 

-2.62 

-1.69 

-0.11 

0.11 

0.24 

-0.98 

1765 

1766 

-3.42 

-1.52 

-0.40 

0.57 

0.02 

1.31 

-1.32 

-0.19 

-1.21 

-0.49 

2.14 

-0.68 

1766 

1767 

-4.22 

0.38 

0.10 

-0.93 

-1.08 

-1.19 

0.78 

-0.69 

-0.88 

1767 

1768 

-0.82 

-1.22 

-1.50 

0.37 

-0.58 

-2.19 

0.68 

0.51 

0.64 

-0.78 

1768 

1769 

1.88 

-0.42 

-0.50 

-1.63 

-0.48 

1.01 

-0.52 

1.51 

.  . 

-2.19 

1.24 

0.62 

1769 

1770 

-0.52 

0.98 

-0.60 

-0.33 

-0.58 

0.81 

-0.72 

0.01 

1.99 

0.51 

1.04 

-0.68 

1770 

1771 

1.78 

-0.52 

-0.60 

-1.43 

1.02 

-0.19 

0.68 

l.fl 

0.49 

-0.69 

-1.06 

2.32 

1771 

1772 

1.58 

2.48 

2.50 

0.57 

-0.58 

1.61 

1.38 

0.41 

0.29 

2.01 

1.94 

2.02 

1772 

1773 

1.58 

-0.42 

-0.80 

-0.03 

-0.48 

-1.72 

-1.29 

0.69 

1.61 

0.34 

1.82 

1773 

1774 

0.48 

0.08 

0.70 

0.77 

-0.28 

0.51 

-0.12 

1.31 

-0.31 

-1.09 

-0.96 

-2.68 

1774 

1775 

0.38 

2.08 

1.60 

0.47 

-0.58 

0.71 

0.78 

-0.09 

-0.31 

-1.79 

-0.16 

-0.88 

1775 

1776 

-0.32 

-0.02 

1.30 

0.97 

-1.28 

0.11 

0.48 

0.41 

-0.71 

0.11 

-0.36 

-1.18 

1776 

1777 

-1.52 

-1.42 

1.30 

-0.23 

-1.08 

-0.79 

-1.22 

0.51 

0.19 

0.41 

1.24 

-1.98 

1777 

1778 

0.38 

0.08 

-1.90 

1.47 

0.62 

-0.29 

0.98 

0.81 

-0.81 

-0.09 

0.64 

1.72 

1778 

1779 

-3.52 

1.98 

0.00 

1.07 

1.72 

-1.39 

0.18 

-0.19 

1.59 

1.81 

-0.16 

1.82 

1779 

1780 

-0.62 

-1.92 

2.70 

-0.43 

1.72 

1.51 

0.78 

0.11 

-0.51 

1.81 

-0.16 

-1.08 

1780 

1781 

-0.12 

0.38 

1.90 

1.47 

0.22 

0.01 

1.78 

0.41 

0.39 

-0.89 

0.04 

1.42 

1781 

1782 

2.18 

-2.42 

-0.70 

-1.03 

-1.08 

1.21 

2.08 

0.91 

-0.31 

-1.79 

-2.46 

-0.58 

1782 

1783 

0.98 

1.18 

-0.60 

0.97 

0.42 

-0.99 

1.08 

-0.29 

-0.31 

1.51 

0.24 

-1.S8 

1783 

1784 

0.48 

-2.02 

0.50 

-2.03 

2.62 

2.11 

1.38 

0.61 

1.49 

-1.49 

-0.46 

-1.18 

1784 

1785 

0.58 

-1.12 

-3.80 

-1.23 

0.72 

1.21 

0.68 

0.61 

2.69 

0.41 

0.74 

2.02 

1785 

1786 

0.18 

0.68 

-0.90 

0.87 

0.72 

0.81 

-0.52 

-0.89 

1.09 

-1.89 

-0.36 

-0.48 

1786 

1787 

-0.32 

0.08 

0.90 

-0.03 

-1.98 

1.71 

-0.02 

1.61 

0.09 

0.81 

0.84 

1.72 

1787 

1788 

2.78 

1.08 

2.30 

1.37 

-0.18 

1.51 

2.78 

-0.39 

0.99 

0.21 

-0.86 

-2.88 

1788 

1789 

-1.72 

0.98 

-1.70 

1.37 

2.22 

-0.79 

0.28 

0.11 

0.29 

0.31 

-1.26 

-2.38 

1789 

1790 

-0.12 

1.48 

-0.20 

-1.73 

1.62 

0.71 

-0.72 

1.21 

0.19 

2.21 

1.24 

0.02 

1790 

1791 

2.48 

1.08 

1.20 

1.87 

-0.18 

-0.49 

0.58 

1.51 

0.09 

-0.29 

-0.46 

1.92 

1791 

1792 

0.98 

-0.12 

1.30 

1.87 

-0.18 

0.21 

0.08 

0.11 

-0.41 

0.71 

0.54 

-0.08 

1792 

1793 

-1.22 

-0.02 

0.40 

-1.43 

-0.38 

0.01 

1.78 

-0.29 

2.49 

1.31 

1.44 

2.22 

1793 

1794 

2.28 

3.08 

2.00 

2.37 

-0.08 

0.81 

1.78 

0.21 

-1.11 

-0.49 

1.84 

-0.38 

1794 

1795 

-3.72 

-3.12 

-0.20 

1.37 

1.52 

-0.79 

-1.42 

0.91 

0.49 

1.71 

-0.16 

1.52 

1795 

1796 

2.48 

1.18 

-1.70 

-0.13 

-0.28 

-0.29 

-0.12 

0.71 

1.39 

0.41 

1.24 

-1.38 

1796 

1797 

0.78 

0.18 

-1.40 

0.67 

1.22 

-1.59 

1.18 

2.51 

1.09 

-0.59 

0.94 

1.32 

1797 

1798 

1.78 

2.08 

0.20 

0.27 

0.72 

-0.09 

0.48 

0.51 

0.29 

-0.39 

-0.86 

-2.08 

1798 

1799 

-3.22 

0.88 

0.60 

-1.23 

-0.98 

-1.49 

-0.62 

0.41 

1.39 

0.51 

-0.96 

-1.18 

1799 

1800 

1.78 

4.58 

-1.10 

2.67 

1.32 

-1.59 

0.38 

-0.09 

0.49 

0.01 

1.24 

-0.08 

1800 

1801 

1.38 

1.08 

1.50 

0.77 

0.32 

-0.39 

-0.62 

-0.79 

0.49 

0.61 

0.04 

0.02 

1801 

1802 

0.18 

1.18 

0.70 

0.87 

-0.08 

1.71 

0.28 

2.21 

1.09 

2.81 

1.04 

1.52 

1802 

1803 

2.38 

-3.82 

0.30 

1.47 

-0.88 

1.11 

0.78 

1.11 

-0.91 

-0.49 

0.54 

0.22 

1803 

The  numbers  without  sign  must  be  subtracted  ;  those  with  the  sign  —  must  be  added. 


LXXXl. 

NORTH  ITALY.  —  MILAN  (continued). 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 


Desree.s  of  Reaumur. 


Year. 

Jan.   Feb. 

March 

Apr  I. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec.  I 

Year. 

0 

0 

0 

0 

o 

0 

o 

o 

0 

0 

o 

o 

1804 

3.98 

-1.32 

-0.60 

-0.03 

1.32 

2.11 

-0.39 

0.49 

0.71 

-0.36 

-0.18 

1804 

1805 

-0.12 

-0.02 

-0.10 

-2.03 

-0.7S 

0.21 

-0.42 

-0.29 

0.79 

-1.19 

-2.36 

-1.58 

1805 

1806 

0.18 

1.68 

0.10 

-1.53 

0.32 

1.01 

-0.52 

-1.19 

-0.41 

-0.19 

1.34 

1.92 

1806 

1807 

0.58 

0.28 

-2.40 

-1.33 

1.32 

0.21 

1.18 

1.71 

0.19 

1.71 

1.34 

-0.08 

1807 

1808 

-1.02 

-1.62 

-3.80 

-1.23 

1.62 

-0.49 

1.98 

-0.69 

0.39 

-2.39 

0.24 

-2.08 

1808 

1809 

0.48 

1.98 

-1.40 

-2.63 

1.02 

0.51 

-0.52 

0.21 

-0.51 

-0.19 

-0.96 

0.22 

1809 

1810 

0.08 

-0.72 

1.90 

-0.23 

0.22 

-1.49 

-2.12 

-0.79 

0.59 

1.11 

0.34 

1.82 

1810 

1811 

-0.72 

1.48 

1.70 

1.47 

1.82 

-029 

1.18 

-0.49 

0.39 

2.21 

2.24 

-0.38 

1811 

1812 

-3.32 

-0.32 

-0.40 

-1.73 

0.92 

1.01 

-0.82 

-0.59 

-1.41 

0.11 

-2.96 

-2.38 

1812 

1813 

-0.12 

1.08 

0.50 

1.07 

1.52 

-0.99 

-2.12 

-1.09 

-1.11 

0.21 

-0.56 

1.32 

1813 

1814 

-0.12 

-4.42 

-1.40 

0.77 

-1.98 

-1.09 

-0.12 

-1.09 

-1.91 

-0.69 

1.04 

1.82 

1814 

1815 

-2.02 

-0.32 

1.90 

0.77 

1.22 

-0.49 

-1.22 

-l".39 

0.29 

0.81 

-1.26 

-1.78 

1815 

1816 

-0.52 

-2.92 

-1.20 

-0.93 

-0.58 

-1.49 

-2.22 

-3.69 

-0.51 

0.41 

-1.-I6 

-1.88 

1816 

1817 

-2.52 

2.08 

0.30 

-2.83 

-1.28 

0.21 

-3.52 

-0.59 

0.89 

-1.89 

0.44 

-0.18 

1817 

1818 

0.48 

3.34 

0.70 

0.37 

-3.80 

0.26 

0.53 

-0.79 

-0.23 

0.48 

1.13 

-0.39 

1818 

1819 

0.00 

0.73 

1.48 

1.35 

-0.02 

-0.53 

0.32 

-0.50 

0.48 

0.46 

0.93 

0.30 

1819 

1820 

-0.79 

0.58 

-0.56 

1.60 

1.03 

-0.48 

-0.48 

1.76 

-0.09 

-0.30 

-0.72 

-0.03 

1820 

1821 

0.80 

-0.18 

-0.52 

0.59 

0.10 

-2.20 

-1.46 

0.43 

1.01 

-0.29 

0.78 

0.35 

1821 

1822 

1.81 

1.28 

2.10 

0.99 

1.05 

3.31 

0.53 

0.26 

0.78 

0.66 

1.38 

-0.48 

1822 

1823 

-1.92 

-0.25 

-0.37 

-0.55 

0.93 

-0.78 

-0.60 

0.53 

1.18 

0.11 

-1.37 

0.01 

1823 

1824 

1.01 

1.49 

-0.40 

-0.85 

-0.16 

-1.57 

1.33 

0.90 

0.71 

0.23 

1.25 

2.07 

1824 

1825 

1.39 

0.62 

-2.38 

1.21 

-0.17 

0.32 

0.05 

0.53 

0.86 

-0.81 

0.82 

3.92 

1825 

1826 

-2.18 

0.44 

0.76 

-0.72 

-1.23 

-0.09 

0.18 

1.55 

0.71 

1.48 

-0.56 

1.16 

1826 

1827 

0.36 

-1.72 

1.12 

0.73 

0.46 

-1.26 

1.20 

-0.60 

-1.06 

1.37 

-1.46 

0.25 

1827 

1828 

1.38 

-0.36 

1.49 

0.64 

0.45 

1.27 

1.38 

0.19 

0.47 

0.38 

-0.81 

0.60 

1828 

1829 

-0.04 

-2.79 

0.05 

0.05 

-0.03 

0.23 

0.22 

-1.15 

-0.89 

-0.40 

-1.68 

-1.90 

1829 

1830 

-3.72 

-3.45 

1.66 

2.66 

0.66 

-0.33 

1.71 

1.02 

-0.79 

-0.81 

0.99 

0.60 

1830 

1831 

0.38 

-0.51 

0.73 

0.19 

-1.12 

-0.56 

0.12 

-1.05 

-1.08 

1.77 

0.24 

1.34 

1831 

1832 

0.41 

0.52 

-0.21 

-0.68 

-2.07 

-1.27 

0.03 

0.49 

-1.15 

-0.47 

-0.41 

-1.71 

1832 

1833 

-0.47 

1.18 

-0.59 

-1.23 

2.00 

0.37 

-2.28 

-2.77 

-3.20 

-1.36 

0.14 

1.37 

1833 

1834 

0.17 

-0.80 

-0.19 

-1.97 

0.53 

-0.31 

-0.23 

-1.16 

0.41 

-0.79 

-0.23 

-0.94 

1834 

1835 

1.03 

0.76 

-0.44 

-0.88 

-1.01 

-1.47 

-2.59 

-2.35 

-2.01 

-2.24 

-3.27 

-2.69 

1835 

1836 

-2.51 

-2.08 

-0.05 

-1.07 

-3.41 

-0.49 

-0.97 

-1.09 

-2.48 

-0.65 

-2.16 

-0.02 

1836 

1837 

-0.83 

-4.75 

-3.12 

-2.41 

-3.58 

0.64 

-1.29 

0.37 

-2.40 

-1.93 

-1.76 

-0.36  1 

1837 

1838 

-2.16 

-2.39 

-0.72 

-2.74 

-0.98 

-0.75 

-0.78 

-1.55 

-1.58 

-1.74 

0.08 

-0.80 

1838 

Means. 

0.52 

2.82 

6.40 

10.03 

14.08 

17.09 

18.92 

18.39 

15.31 

10.79 

5.76 

2.08 

Means. 

The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

93 


LXXXII. 

SWITZERLAND.  — GENEVA. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Desrees  of  Reaumur. 


lean. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

0 

0 

o 

0 

o 

0 

c 

o 

o 

0 

0 

o 

1768 

-0.86 

-0.01 

-2.38 

-0.14 

-0.61 

-1.71 

-0.92 

-1.25 

-1.42 

0.99 

0.77 

0.08 

1768 

1769 

O.i)2 

0.16 

-1.05 

0.13 

-0.71 

-1.57 

-1.11 

-1.43 

-0.89 

-3.00 

1.62 

0.61 

1769 

1770 

-1.25 

-1.30 

-1.72 

-2.40 

-1.20 

-1.34 

-2.97 

-1.24 

0.49 

-0.81 

0.35 

0.42 

1770 

1771 

0.53 

-0.67 

0.17 

-2.68 

0.34 

-1.84 

0.07 

-1.45 

-0.57 

-0.17 

-1.80 

1.66 

1771 

1772 

0.61 

2.57 

1.76 

-0.41 

-2.23 

0.35 

-0.72 

-0.47 

0.52 

1.34 

1.29 

1.16 

1772 

1773 

1.47 

-1.84 

-1.18 

-1.16 

-1.64 

-0.87 

-2.03 

-1.70 

-0.12 

-0.35 

-0.12 

1.01 

1773 

1774 

1.22 

0.91 

2.38 

0.73 

-0.94 

-0.47 

-1.27 

0.42 

-1.08 

-1.45 

-1.18 

-2.03 

1774 

1775 

0.89 

1.89 

0.99 

-1.60 

-1.90 

0.54 

-0.84 

-0.82 

-0.02 

-0.24 

0.33 

-0.68 

1775 

1776 

-1.78 

1.92 

1.85 

0.18 

-1.96 

0.09 

0.20 

0.28 

-1.50 

0.26 

-0.26 

-0.09 

1776 

1777 

-0.41 

-0.76 

2.46 

-1.23 

-1.51 

-0.38 

-1.12 

0.45 

-0.41 

1.27 

0.21 

-1.72 

1777 

1778 

0.03 

-0.93 

0.86 

0.78 

-0.09 

-0.76 

1.59 

0.68 

-1.85 

0.32 

0.76 

1.85 

1778 

1779 

-3.43 

-0.28 

-0.14 

1.70 

0:97 

-1.22 

-0.61 

-0.45 

0.48 

1.77 

0.57 

2.70 

1779 

1780 

-1.48 

-1.63 

2.35 

-0.86 

097 

1.14 

0.95 

1.16 

0.14 

0.51 

-1.02 

-1.25 

1780 

1781 

0.96 

1.09 

0.37 

2.15 

1.78 

0.28 

-1.17 

0.30 

0.76 

-0.47 

1.69 

2.97 

1781 

1782 

2.22 

-3.74 

-0.53 

-0.95 

-1.76 

0.18 

-1.10 

-0.72 

-0.97 

-1.06 

-1.83 

-2.04 

1782 

1783 

2.01 

1.68 

-0.27 

-0.71 

-0.06 

-1.13 

1.75 

-0.94 

0.17 

0.93 

0.81 

1.03 

1783 

1784 

-1.06 

-2.03 

-0.43 

-2.51 

1.73 

1.69 

0.84 

-1.62 

1.40 

-1.87 

-0.76 

-3.38 

1784 

1785 

0.58 

-3.26 

-6.75 

-5.48 

-0.19 

0.30 

-0.33 

-1.75 

0.94 

-0.40 

0.11 

0.42 

1785 

1786 

0.41 

0.08 

-1.62 

0.69 

-0.25 

1.92 

-0.99 

-1.22 

-0.59 

-1.71 

-0.69 

0.19 

1786 

17S7 

-1.99 

-1.15 

1.76 

-0.30 

-1.98 

0.79 

-0.70 

0.21 

-0.27 

0.41 

0.72 

2.83 

1787 

1788 

1.01 

2.06 

2.19 

1.04 

1.13 

1.04 

1.61 

-0.45 

0.71 

-0.83 

-2.15 

-4.48 

1788 

1789 

-1.17 

1.12 

-1.97 

1.19 

1.71 

-1.25 

-0.80 

-0.19 

-0.57 

-0.59 

-1.59 

-0.17 

1789 

1790 

0.36 

0.75 

0.99 

-0.73 

1.52 

0.94 

-1.10 

0.63 

-0.84 

1.95 

1.13 

0.78 

1790 

1791 

2.40 

0.04 

-0.02 

2.86 

0.61 

1.04 

0.98 

2.30 

0.98 

0.72 

-1.37 

1.30 

1791 

1792 

1.22 

-0.28 

2.11 

1.81 

-0.12 

1.14 

1.03 

0.83 

-0.09 

1.37 

0.86 

0.45 

1792 

1793 

-0.52 

1.05 

1.77 

0.08 

-0.05 

0.20 

3.12 

2.49 

-0.12 

1.24 

0.61 

1.19 

1793 

1794 

0.14 

2.21 

1.91 

3.26 

0.76 

1.10 

2.11 

0.39 

-0.74 

-0.28 

0.86 

-1.75 

1794 

1795 

-4.85 

0.37 

0.26 

1.76 

1.32 

1.34 

-0.73 

1.34 

1.54 

1.92 

-0.96 

1.11 

1795 

1796 

1.25 

0.72 

-2.15 

-0.06 

0.60 

0.60 

0.37 

0.80 

1.61 

0.41 

-0.14 

-1.92 

1796 

1797 

0.11 

-1.41 

-1.08 

1.49 

2.14 

-1.28 

2.21 

1.28 

0.71 

-0.08 

0.71 

1.61 

1797 

1798 

0.53 

-1.17 

-1.02 

0.83 

1.00 

1.29 

0.45 

0.81 

0.48 

-0.29 

0.44 

-0.96 

1798 

1799 

-1.57 

1.71 

-0.16 

-1.73 

-1.70 

-1.16 

-0.13 

0.67 

0.21 

-0.40 

-0.54 

-2.59 

1799 

1800 

1.64 

0.06 

-1.66 

2.43 

2.40 

-0.83 

1.48 

0.82 

0.96 

-1.55 

0.63 

-0.27 

1800 

Means. 

-0.43 

0.75 

3.08 

7.19 

11.21 

14.03 

15.44 

14.85 

11.49 

7.32 

3.34 

0.57 

Means. 

1796 

2.27 

0.07 

-2.14 

-0.25 

-0.91 

-0.64 

-1.10 

0.16 

0.70 

0.08 

-0.68 

-1.70 

1796 

1797 

0.45 

-0.85 

-0.66 

0.97 

0.67 

-2.03 

1.27 

0.71 

-0.48 

-0.26 

0.47 

1.58 

1797 

1798 

0.68 

-0.25 

-0.40 

0.96 

-0.22 

0.32 

-0.64 

-0.14 

0.12 

-0.08 

-0.76 

-1.36 

1798 

1799 

-1.44 

1.93 

-0-26 

-1.60 

-1.50 

-0.49 

-0.46 

0.33 

0.19 

-0.26 

-1.24 

-3.30 

1799 

1800 

2.06 

0.03 

-1.53 

2.88 

1.66 

-0.97 

1.62 

0.70 

0.41 

-1.16 

0.67 

-0.32 

1800 

1801 

1.81 

0.13 

1.43 

0.74 

0.43 

-0.26 

0.42 

0.15 

0.90 

0.84 

0.67 

0.95 

1801 

1802 

-3.98 

-0.38 

0.94 

1.18 

0.53 

1.66 

-0.12 

2.68 

1.72 

2.51 

0.63 

0.58 

1802 

1803 

-0.26 

-2.58 

0.24 

2.05 

-1.42 

0.89 

2.20 

2.25 

-0.79 

-0.57 

1.04 

1.88 

1803 

1804 

4.58 

-1.58 

-0.19 

0.30 

1.50 

2.02 

0.04 

0.47 

0.59 

0.22 

1.36 

-0.59 

1804 

The  numbers  without  sign  must  be  subtracted;  those  with  the  sign  —  must  be  added 

94 


LXXXII. 

SWITZERLAND.  —  GENEVA  (continued). 

For  Keducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

Apri'. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

0 

0 

o 

0 

o 

0 

0 

o 

o 

0 

o 

o 

1805 

-0.41 

-0.23 

-0.41 

-1.35 

-1.22 

-0.49 

-0.41 

-0.73 

0.18 

-1.45 

-2.19 

-1.64 

1805 

1808 

3.23 

1.83 

0.12 

-1.80 

1.33 

1.66 

0.08 

-0.39 

0.11 

1.10 

1.34 

2.42 

1806 

1807 

-1.10 

0.24 

-2.65 

-1.47 

1.42 

0.43 

2.66 

3.03 

-0.58 

1.42 

0.39 

-2.48 

1807 

1808 

-0.49 

-3.14 

-2.58 

-1.87 

1.14 

-1.33 

0.70 

0.59 

-0.14 

-2.40 

-0.28 

-2.99 

1808 

1809 

2.23 

1.95 

0.19 

-3.68 

-0.06 

0.12 

-0.43 

-0.32 

-1.00 

-1.05 

-1.76 

0.70 

1809 

1810 

-3.14 

-3.34 

3.08 

-0.28 

0.29 

-0.45 

-1.01 

-0.70 

1.37 

1.26 

1.05 

1.19 

1810 

1811 

-2.22 

1.98 

1.46 

1.34 

1.23 

1.82 

1.53 

-0.14 

0.70 

2.21 

0.71 

-0.85 

1811 

1812 

-3.92 

1.40 

-0.02 

-1.54 

0.27 

0.02 

-0.37 

-0.69 

-0.43 

0.13 

-1.80 

-2.74 

1812 

1813 

-1.74 

1.51 

-0.69 

0.53 

0.54 

-0.84 

-2.10 

-1.02 

-1.14 

0.78 

-0.49 

0.32 

1813 

1814 

-1.32 

-3.92 

-1.44 

0.96 

-1.74 

-0.26 

0.37 

-0.66 

-1.74 

-0.87 

0.95 

2.34 

1814 

1815 

-2.24 

1.43 

2.17 

1.06 

0.82 

0.08 

0.20 

-0.59 

0.54 

1.43 

-1.57 

-0.39 

1815 

1816 

-0.13 

-1.33 

2.54 

-0.48 

-0.54 

-1.41 

-2.40 

-2.14 

-0.47 

0.59 

-1.05 

-0.02 

1816 

1817 

2.50 

2.38 

0.29 

-2.11 

-1.34 

1.35 

-0.25 

-0.71 

2.16 

-1.58 

0.85 

-0.45 

1817 

1818 

0.54 

0.69 

0.13 

-0.08 

-1.26 

0.66 

1.41 

-0.41 

-0.89 

-0.29 

1.60 

-0.26 

1818 

1819 

1.86 

0.98 

0.82 

1.00 

-0.21 

-0.19 

0.07 

-0.34 

0.42 

0.07 

-0.40 

0.95 

1819 

1820 

0.10 

0.54 

-1.24 

2.07 

0.39 

-0.59 

-0.65 

0.84 

-1.93 

-0.31 

-2.16 

0.02 

1820 

1821 

1.98 

-1.31 

0.94 

0.71 

-1.19 

-1.54 

-1.17 

0.62 

0.26 

0.27 

2.34 

3.36 

1821 

1822 

0.20 

1.27 

3.06 

0.47 

1.32 

3.85 

0.27 

-0.85 

-0.07 

0.69 

1.60 

-2.32 

1822 

1823 

-1.17 

1.46 

-0.29 

-0.42 

0.17 

-1.62 

-1.54 

-1.04 

-0.42 

-2.10 

-1.97 

1.04 

1823 

1824 

-0.78 

-0.30 

-1.84 

-£.05 

-1.50 

-2.05 

0.17 

-1.49 

-1.23 

-1.58 

0.03 

1.30 

1824 

1825 

-0.07 

-0.55 

-1.09 

1.69 

-0.63 

0.26 

-0.40 

-0.11 

0.88 

0.30 

0.54 

2.76 

1825 

Means. 

-0.42 

1.87 

4.70 

8.79 

13.45 

15.81 

17.67 

17.66 

14.70 

9.73 

5.23 

1.27 

Means. 

1826 

-3.23 

1.12 

1.47 

0.34 

-1.04 

-0.06 

0.90 

2.57 

1.22 

0.95 

-1.19 

0.03 

1826 

1827 

1.49 

-2.15 

1.02 

1.29 

0.90 

-0.07 

1.95 

0.66 

0.24 

0.99 

-2.02 

2.56 

1827 

1828 

2.82 

1.06 

0.70 

0.81 

1.22 

0.89 

0.59 

-0.80 

0.86 

0.96 

0.62 

0.94 

1828 

1829 

-0.85 

-0.63 

0.10 

6.25 

-0.06 

-0.83 

0.15 

-0.89 

-0.71 

-1.52 

-1.28 

-3.87 

1829 

1830 

-4.14 

-1.74 

1.20 

2.70 

0.57 

r0.49 

0.53 

-0.01 

-0.94 

-0.86 

0.46 

-0.90 

1830 

1831 

-1.10 

0.46 

1.67 

1.54 

0.53 

-0.11 

-0.02 

-0.02 

-0.29 

2.16 

0.5S 

0.90 

1831 

1832 

0.10 

0.36 

-0.25 

0.45 

-0.40 

-0.83 

0.81 

2.29 

-0.39 

0.07 

-0.02 

0.62 

1832 

1833 

-0.06 

3.36 

-0.50 

-0.68 

2.67 

1.23 

-1.29 

-1.17 

-0.17 

0.59 

0.39 

3.28 

1833 

1834 

5.06 

1.47 

0.35 

-0.70 

2.28 

1.53 

1.94 

1.07 

2.74 

0.68 

0.71 

-1.18 

1834 

1835 

1.15 

1.40 

-0.44 

-0.06 

0.56 

0.15 

1.69 

0.40 

0.22 

-1.34 

-2.27 

-2.66 

1835 

1836 

0.48 

-0.04 

1.82 

-0.95 

-2.14 

0.17 

0.57 

0.28 

-0.62 

0.14 

-0.02 

0.50 

1836 

1837 

0.37 

0.52 

-2.94 

-1.89 

-2.18 

1.21 

-0.58 

1.41 

-1.16 

-0.39 

-1.06 

-0.46 

1837 

1838 

-3.64 

-0.91 

0.25 

-1.75 

-0.11 

-0.71 

-0.56 

-1.23 

-0.58 

-0.61 

1.18 

-0.57 

1838 

1839 

0.55 

-0.07 

-0.42 

-1.55 

-0.97 

1.14 

0.24 

-1.73 

-0.58 

1.11 

1.43 

2.81 

1839 

1840 

2.60 

0.02 

-3.22 

0.71 

-0.10 

-0.37 

-2.32 

-0.01 

-0.56 

-1.74 

1.43 

-3.14 

1840 

1841 

0.45 

-0.25 

0.77 

-0.69 

1.82 

-1.71 

-1.98 

-1.37 

0.09 

0.90 

0.26 

0.89 

1841 

1842 

-5.18 

-2.84 

0.56 

-0.58 

0.02 

1.00 

-0.19 

0.78 

-1.08 

-2.18 

-1.03 

-0.71 

1842 

1843 

1.50 

2.22 

-0.34 

0.27 

-1.60 

-2.56 

-2.35 

-0.73 

0.60 

-0.24 

0.25 

-0.83 

1843 

1844 

1844 

1845 

1.70 

-3.33 

-1.77 

0.49 

-1.98 

0.47 

0.06 

-1.53 

1.10 

0.40 

1.54 

1.74 

1845 

Means. 

-0.72 

0.98 

4.16 

7.03 

10.77 

13.61  14.96  14.58  jll.  84 

7.98 

3.98 

1.30 

Means. 

The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added 

E  95 


LXXXIII. 

SOUTH  GERMANY. — VIENNA. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 


Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

o 

o 

o 

o 

0 

o 

0 

o 

0 

o 

0 

0 

1775 

-1.43 

1.86 

1.21 

-2.35 

-2.77 

1.32 

-0.41 

1.29 

0.84 

0.26 

0.29 

-1.09 

1775 

1776 

-4.30 

0.57 

0.70 

-1.11 

-2.30 

-0.42 

-0.24 

0.25 

-1.42 

-1.53 

-1.32 

-2.19 

1776 

1777 

-1.79 

-1.24 

0.32 

-2.93 

-0.22 

-0.10 

-1.17 

0.57 

-1.38 

-0.53 

0.35 

-1.00 

1777 

1778 

1.92 

-1.04 

0.18 

1.89 

0.04 

-0.43 

1.18 

0.95 

-0.89 

-0.54 

0.87 

3.61 

1778 

1779 

-1.75 

3.15 

2.27 

3.05 

1.24 

-1.32 

-1.35 

-0.07 

0.65 

1.00 

0.43 

3.01 

1779 

1780 

-1.68 

3.04 

2.73 

-1.38 

-0.18 

-0.92 

-0.70 

-0.48 

-1.08 

0.51 

0.19 

-1.99 

1780 

1781 

-0.87 

0.05 

0.77 

0.86 

0.25 

1.44 

-0.06 

2.31 

1.40 

-0.45 

1.84 

0.34 

1781 

1782 

2.72 

-2.63 

0.60 

-0.06 

0.54 

1.82 

2.74 

0.85 

0.86 

-0.76 

-1.50 

0.62 

1782 

1783 

3.59 

4.12 

-0.08 

0.65 

1.81 

1.94 

1.66 

1.81 

2.12 

1.59 

0.58 

-2.56 

1783 

1784 

-3.51 

-1.87 

-0.42 

-1.36 

1.69 

0.86 

0.47 

0.49 

1.98 

-2.56 

0.70 

0.03 

1784 

1785 

-0.73 

-0.93 

-5-63 

-3.04 

-0.67 

-1.47 

-0.83 

-0.86 

2.11 

-0.55 

0.41 

0.17 

1785 

1786 

0.52 

0.16 

-0.04 

1.84 

-1.12 

0.25 

-1.54 

-1.85 

-0.92 

-2.11 

-2.12 

0.60 

1786 

17S7 

-0.39 

1.47 

0.65 

-1.46 

-2.11 

1.11 

-0.40 

0.35 

-0.78 

1.10 

0.93 

2.S2 

1787 

1788 

2.22 

0.17 

0.81 

0.05 

-0.36 

1.18 

2.28 

-1.72 

1.00 

-0.29 

-1.39 

-6.79 

1788 

1789 

-0.49 

2.00 

-2.43 

1.19 

2.15 

-0.49 

0.40 

-0.60 

0.37 

0.77 

0.73 

0.21 

1789 

1790 

0.86 

2.87 

0.31 

-1.11 

1.20 

1.56 

-1.10 

0.31 

-0.83 

-0.76 

-0.43 

2.09 

1790 

1791 

4.29 

1.01 

1.63 

1.33 

-0.44 

-0.33 

-0.37 

0.67 

-0.84 

-0.40 

-0.46 

0.89 

1791 

1792 

0.56 

-1.24 

0.47 

0.38 

-0.96 

0.62 

0.38 

0.26 

-0.93 

-1.11 

-0.24 

0.56 

1792 

1793 

-1.55 

1.27 

-1.00 

-2.40 

-1.23 

-1.08 

1.81 

1.86 

-0.07 

1.13 

0.64 

1.99 

1793 

1794 

2.24 

2.99 

1.95 

3.74 

1.35 

1.55 

2.92 

-0.75 

-1.38 

-0.19 

0.33 

-0.95 

1794 

1795 

-4.94 

-1.29 

0.23 

1.81 

-0.05 

1.44 

-1.95 

0.31 

-0.17 

2.75 

-1.00 

2.28 

1795 

1796 

5.23 

1.32 

-2.73 

-1.52 

0.48 

-0.04 

0.14 

0.58 

1.96 

0.84 

-0.14 

-1.48 

1796 

1797 

1.58 

1.02 

-0.71 

2.10 

2  94 

0.68 

1.95 

2.17 

2.01 

1.23 

0.54 

1.11 

1797 

1798 

1.96 

2.83 

1.40 

0.65 

0.26 

0.84 

0.14 

1.29 

1.62 

-0.47 

-0.68 

-3.68 

1798 

1799 

-5.34 

-2.08 

-0.83 

-0.43 

-0.45 

-1.16 

-0.58 

1.00 

-0.50 

0.45 

0.58 

-2.94 

1799 

1800 

0.74 

-0.19 

-3.31 

5.57 

1.90 

-1.45 

-0.44 

1.49 

0.27 

-0.40 

1.57 

0.10 

1800 

1801 

1.85 

-0.21 

2.47 

0.80 

1.83 

-0.85 

-1.18 

-1.32 

1.37 

1.94 

1.71 

0.99 

1801 

1802 

-0.43 

-1.34 

0.89 

0.73 

-1.14 

1.33 

1.02 

1.65 

0.38 

2.10 

1.84 

1.40 

1802 

1803 

-2.68 

-3.46 

-0.50 

2.49 

-1.59 

-0.75 

0.23 

0.08 

-2.12 

-0.45 

1.24 

0.27 

1803 

1804 

3.42 

-0.59 

-2.44 

0.05 

0.29 

-0.10 

0.25 

-0.51 

0.80 

0.48 

-2.47 

-2.40 

1804 

1805 

-0.48 

-1.18 

-1.28 

-2.16 

-1.85 

-0.79 

-1.26 

-1.61 

-0.04 

-2.89 

-2.19 

0.24 

1805 

1806 

4.04 

2.12 

1.07 

-2.07 

1.84 

-0.02 

-0.16 

-0.62 

0.56 

-0.80 

1.60 

3.48 

1806 

1807 

1.08 

1.96 

-1.54 

-1.18 

1.23 

-0.34 

1.25 

4.74 

0.17 

1.37 

1.96 

0.46 

1807 

1808 

1.20 

-0.51 

-4.99 

-1.20 

1.42 

0.15 

1.30 

1.80 

1.13 

-0.97 

-0.32 

-3.68 

1808 

1809 

-0.08 

1.54 

-1.13 

-2.51 

0.89 

0.27 

0.23 

0.79 

0.11 

-1.31 

-0.75 

1.67 

1809 

1810 

-0.71 

-0.03 

2.03 

-0.74 

0.50 

-1.65 

0.82 

0.15 

2.26 

-0.18 

-0.09 

2.01 

1810 

1811 

-3.58 

-0.91 

2.0S 

0.75 

3.12 

4.62 

2.56 

0.99 

0.42 

3.63 

1.20 

0.19 

1811 

1812 

-2.13 

0.53 

0.67 

-2.67 

0.65 

0.35 

-0.87 

-0.52 

-1.32 

2.04 

-0.84 

-3.96 

1812 

1813 

-1.84 

2.07 

-0.76 

1.56 

0.36 

-1.82 

-1.34 

-1.80 

-1.34 

-0.37 

-0.24 

0.68 

1813 

1814 

-0.34 

-4.37 

-0.55 

1.54 

-2.19 

-1.76 

0.66 

-0.21 

-2.45 

-0.73 

0.32 

2.19 

1814 

1815 

-1.03 

2.39 

2.06 

0.10 

0.52 

0.28 

-1.51 

-1.29 

-1.20 

0.06 

-1.07 

-2.87 

1815 

1816 

1.84 

-0-80 

-0.19 

0.09 

-0.95 

-0.73 

-1.58 

-1.39 

-0.95 

-0.73 

-0.39 

-1.45 

1816 

1817 

3.24 

3.78 

0.51 

-4.08 

0.53 

2.18 

-0.08 

-0.25 

0.56 

-2.29 

1.03 

0.16 

1817 

1818 

2.77 

0.78 

1.84 

2.01 

-0.11 

0.55 

0.13 

-0.71 

0.41 

0.84 

0.60 

-1.31 

1818 

1819 

1.22 

2.04 

1.94 

1.17 

-0.75 

1.01 

0.66 

-0.35 

0.71 

-0.12 

0.51 

-1.21 

1819 

The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

96 


LXXXIII. 

SOUTH  GERMANY.  —  VIENNA  (continued). 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

De?rees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

0 

0 

0 

0 

0 

o 

o 

0 

o 

o 

0 

0 

1820 

-2.47 

0.36 

-0.86 

1.78 

1.97 

-1.18 

-0.96 

2.36 

-0.71 

0.16 

-0.36 

-1.49 

1820 

1821 

2.22 

-1.56 

-0.72 

1.57 

-0.81 

-3.08 

-1.83 

-0.76 

0.51 

-0.12 

1.93 

2.90 

1821 

1822 

2.85 

1.63 

3.44 

1.05 

1.21 

1.50 

1.16 

-0.27 

0.06 

2.12 

0.44 

-0.27 

1822 

1823 

-4.55 

0.68 

0.80 

-0.29 

0.42 

-0.68 

-1.35 

0.15 

0.36 

1.13 

0.29 

1.35 

1823 

1824 

1.77 

2.31 

0.09 

-0.72 

-0.74 

-0.60 

-0.22 

-0.53 

1.36 

0.60 

1.56 

4.00 

1824 

1825 

3.15 

0.50 

-1.59 

1.02 

-0.14 

-0.31 

-0.72 

-0.47 

-0.62 

-1.71 

1.74 

3.11 

1825 

1826 

-3.65 

-2.12 

0.91 

-0.12 

-2.42 

-0.38 

1.34 

2.06 

0.69 

0.89 

-0.32 

1.78 

1826 

1827 

0.69 

-2.92 

1.61 

1.65 

1.33 

1.19 

1.67 

-1.06 

-0.57 

0.82 

-3.48 

0.83 

1827 

182S 

0.19 

-2.22 

0.88 

1.30 

-0.16 

0.21 

0.63 

-1.49 

-0.70 

-0.82 

0.48 

1.57 

1828 

1829 

-1.66 

-3.79 

-1.87 

-0.23 

-2.26 

-2.69 

-0.32 

-2.62 

-0.31 

-2.12 

-3.62 

-6.11 

1829 

1830 

-5.31 

-3.23 

-0.44 

0.94 

-0.39 

0.33 

0.02 

-0.04 

-1.81 

-1.68 

0.76 

1.13 

1830 

1831 

-1.42 

0.26 

0.43 

2.23 

-0.90 

-1.86 

0.33 

-1.01 

-1.96 

2.02 

-0.16 

-0.04 

1831 

1832 

0.55 

0.61 

0.04 

-0.16 

-1.90 

-1.46 

-1.29 

0.32 

-0.86 

0.04 

-1.57 

-1.36 

1832 

1833 

-3.35 

2.33 

0.24 

-1.40 

2.57 

1.20 

-2.26 

-2.80 

-1.22 

-0.55 

0.23 

4.03 

1833 

1834 

4.67 

0.32 

-0.29 

-1.17 

2.24 

1.65 

2.61 

1.26 

2.85 

-0.08 

-0.89 

1.25 

1834 

1835 

1.71 

1.46 

0.46 

-1.10 

0.27 

-0.07 

0.92 

0.19 

0.09 

-0.76 

-3.77 

-1.39 

1835 

1836 

-0.08 

0.29 

3.84 

0.00 

-2.95 

0.30 

-0.48 

-0.78 

-0.89 

0.91 

-1.00 

2.44 

1836 

1837 

0.20 

-2.39 

-1.96 

-1.18 

-2.57 

-1.38 

-2.96 

0.84 

-2.22 

-0.82 

-0.74 

-0.95 

1837 

1838 

-5.10 

-4.14 

-0.50 

-2.44 

-0.76 

-0.74 

-1.39 

-2.29 

-0.03 

-1.75 

-0.65 

-0.84 

1838 

1839 

1.12 

0.73 

-2.31 

-3.85 

-2.04 

1.06 

0.36 

-2.23 

0.23 

1.05 

1.55 

0.70 

1839 

1840 

1,03 

-0.88 

-3.76 

-0.55 

-1.59 

-1.05 

-1.56 

-1.94 

-0.11 

-2.03 

2.09 

-7.72 

1840 

1841 

0.33 

-3.24 

0.65 

0.93 

2.19 

-1.02 

0.55 

-1.10 

0.24 

2.04 

0.28 

2.27 

1841 

Means. 

-1.22 

0.63 

3.85 

8.66 

13.31 

15.72 

17.14 

16.77 

13.25 

8.51 

3.67 

0.39 

Means. 

LXXXIV.  SOUTH  GERMANY.  —  RATISBON. 

1773 

3.00 

-0.28 

-0.04 

-0.28 

0.25 

0.34 

-1.23 

-0.60 

0.47 

1.20 

1.06 

2.35 

1773 

1774 

1.63 

0.85 

2.17 

1.97 

-0.10 

-0.17 

-1.11 

0.16 

-1.29 

-0.63 

-2.98 

-2.32 

1774 

1775 

0.67 

2.87 

1.13 

-2.41 

-3.42 

-0.51 

-1.91 

.  . 

-0.73 

-2.19 

-0.14 

-0.64 

1775 

1776 

—3.04 

1.19 

1776 

1777 

-1.47 

-0.68 

2.37 

-1.29 

-0.16 

0.28 

-1.02 

1.24 

0.01 

1.07 

1.31 

-1.17 

1777 

1778 

1.88 

0.21 

0.89 

1.98 

1.76 

0.81 

3.20 

2.38 

-1.33 

-0.36 

1.36 

3.06 

1778 

1779 

-2.51 

1.43 

2.27 

2.89 

1.88 

-0.34 

-0.38 

0.95 

1.40 

2.18 

1.47 

3.74 

1779 

1780 

-0.83 

-1.52 

2.87 

-0.92 

0.87 

1.30 

0.64 

1.65 

1.32 

1.25 

0.25 

-0.75 

1780 

1781 

1.52 

1.88 

^0.82 

1.52 

0.48 

2.36 

2.45 

-1.03 

0.53 

0.56 

1781 

1782 

2.46 

-2.93 

3.32 

3.15 

3.74 

1.92 

2.02 

-0.28 

0.80 

-1.67 

-2.72 

-0.32 

1782 

1783 

3.48 

2.22 

-0.95 

0.26 

0.93 

0.92 

1.73 

0.45 

0.13 

1.00 

-0.34 

-2.38 

1783 

1784 

-4.07 

-3.45 

-1.69 

-2.76 

1.67 

0.60 

0.23 

0.34 

2.21 

-2.46 

0.36 

-1.21 

"  1784 

1785 

-1.20 

-2.85 

-6.49 

-4.37 

-1.08 

-0.83 

-1.42 

-1.91 

2.05 

-0.77 

0.28 

0.10 

1785 

1786 

0.66 

0.04 

-2.05 

1.32 

-1.54 

1.28 

-2.31 

-1.85 

-1.30 

-1.93 

-2.68 

-0.18 

1786 

1787 

-1.03 

4.29 

0.75 

-1.53 

-2.51 

0.92 

-1.31 

0.36 

0.07 

1.78 

0.89 

2.06 

1787 

1788 

1.86 

-0.61 

-0.30 

-0.59 

-0.35 

0.88 

1.66 

-1.53 

1.44 

-0.20 

-2.14 

-8.30 

1788 

1789 

-1.93 

1.41 

-2.90 

0.64 

1.62 

-1.30 

-0.29 

-0.28 

-0.53 

0.27 

0.25 

0.64 

1789 

1790 

1.99 

1.73 

0.91 

-1.21 

1.20 

1.42 

-1.49 

-0.08 

-0.87 

-0.37 

-0.26 

0.89 

1790 

1791 

3.24 

0.14 

1.00 

1.81  -0.76 

-0.35 

-0.35 

1.14 

-0.15 

0.50 

-2.43 

0.84 

1791 

E 


The  numbers  without  sisn  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

97 


LXXXIV. 

SOUTH  GERMANY.  —  RATISBON  (continued). 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

(I 

I 

c 

o 

0 

o 

0 

o 

0 

0 

o 

c 

0 

o 

1792 

-0.57 

-0.21 

1.41 

1.17 

-1.12 

0.87 

0.66 

0.88 

-1.01 

0.05 

0.17 

0.89 

1792 

1793 

-1.17 

1.26 

0.53 

-1.81 

-1.23 

-0.76 

1.56 

1.09 

-0.47 

1.87 

0.95 

1.26 

1793 

1794 

2.30 

3.01 

3.05 

3.04 

1.19 

1.69 

2.85 

-0.80 

-1.00 

1.24 

0.67 

-0.78 

1794 

1795 

-5.05 

-0.89 

-0.10 

1.96 

-0.82 

1.39 

-2.22 

0.29 

l.OS 

3.11 

-0.98 

2.26 

1795 

1796 

4.26 

1.59 

-1.63 

-0.77 

-0.25 

0.05 

0.47 

0.93 

2.24 

0.28 

-0.38 

-2.04 

1796 

1797 

1.46 

1.52 

-0.17 

2.09 

2.60 

-0.72 

2.14 

1.73 

0.75 

0.06 

1.00 

1.59 

1797 

1798 

1.88 

1.94 

0.18 

1.02 

0.66 

1.65 

0.50 

1.26 

1.08 

-0.73 

-0.68 

-2.69 

1798 

1799 

-5.61 

0.14 

-0.29 

-1.87 

-1.37 

-0.83 

-0.91 

-2.86 

-0.60 

-0.23 

-0.35 

-3.81 

1799 

1800 

1.15 

-0.63 

-2.62 

4.66 

1.80 

-1.42 

0.32 

1.53 

0.43 

-0.69 

1.30 

0.63 

1800 

1801 

2.72 

0.10 

1.82 

0.76 

2.45 

-0.75 

-0.30 

0.13 

1.15 

1.60 

1.45 

0.81 

1801 

1802 

-3.20 

-0.90 

0.29 

0.62 

0.16 

1.66 

-0.04 

2.80 

0.73 

2.40 

0.63 

0.71 

1802 

1803 

-1.24 

-2.05 

-0.06 

2.70 

-1.78 

-0.31 

1.70 

1.31 

-0.96 

-0.33 

0.29 

0.93 

1803 

1804 

3.84 

-0.86 

-1.18 

-0.49 

1.17 

0.88 

0.29 

-0.14 

1.27 

1.09 

-0.71 

-1.68 

1804 

1805 

-1.41 

-1.00 

-0.34 

-1.27 

-1.76 

-0.88 

-0.88 

-1.60 

0.74 

-2.03 

-1.81 

-0.21 

1805 

1806 

4.22 

2.45 

0.40 

-2.24 

2.47 

0.16 

-0.49 

0.15 

0.86 

0.04 

1.94 

3.58 

1806 

1807 

1.19 

1.18 

-1.17 

-1.32 

1.24 

0.46 

2.87 

4.63 

-0.94 

1.58 

1.03 

1.54 

1807 

1808 

1.08 

-0.73 

-2.79 

-1.93 

2.02 

-0.45 

1.61 

1.19 

0.33 

-1.97 

-0.23 

-5.46 

1808 

1809 

0.33 

2.19 

-0.40 

-2.92 

0.71 

-0.25 

0.02 

0.23 

-0.31 

-0.76 

-0.86 

0.93 

1809 

1810 

-1.72 

-2.39 

0.86 

-0.63 

-0.05 

-1.00 

-0.41 

0.17 

2.72 

0.52 

0.04 

1.89 

1810 

1811 

-2.93 

-0.16 

2.09 

1.48 

2.23 

2.85 

1.75 

0.24 

0.43 

2.24 

1.43 

-0.25 

1811 

1812 

-1.33 

1.05 

0.28 

-2.87 

0.13 

-1.15 

-2.18 

-1.44 

-1.39 

0.60 

-1.99 

-4.72 

1812 

1813 

-3.03 

0.99 

-1.15 

0.46 

-0.60 

-1.86 

-1.73 

-2.10 

-1.47 

-0.50 

-0.75 

-0.33 

1813 

1814 

-1.37 

-4.71 

-2.93 

0.49 

-2.79 

-2.39 

-0.12 

-1.12 

-2.45 

-1.50 

0.65 

1.77 

1814 

1815 

-1.30 

1.05 

1.18 

-0.37 

-0.46 

-0.74 

-2.23 

-2.07 

-1.35 

-0.70 

-1.37 

-2.26 

1815 

1816 

1.36 

-1.83 

-1.23 

-0.93 

-2.69 

-2.21 

-2.42 

-2.56 

-2.04 

-0.93 

-1.49 

-0.75 

1816 

1817 

2.51 

2.42 

-1.14 

-5.01 

-1.93 

0.61 

-1.79 

-1.89 

0.56 

-3.22 

0.63 

-0.70 

1817 

1818 

2.  OS 

0.29 

-0.16 

0.27 

-1.72 

-0.02 

-0.48 

-2.27 

-1.09 

-0.71 

0.41 

-2.08 

1818 

1819 

1.49 

0.60 

0.64 

-0.09 

-0.76 

0.15 

-0.05 

-0.35 

-0.28 

-0.78 

-0.99 

-1.34 

1819 

1820 

-2.43 

-0.35 

-2.26 

0.38 

-0.47 

-2.89 

-1.66 

0.93 

-2.28 

-1.22 

-1.63 

-1.66 

1820 

1821 

1.17 

-3.06 

-1.51 

0.99 

-2.48 

-3.01 

-2.77 

-1.18 

-0.06 

-0.99 

1.51 

2.53 

1821 

1822 

2.21 

0.63 

1.92 

0.26 

0.53 

2.43 

0.49 

-0.87 

-0.56 

0.73 

0.48 

-2.29 

1822 

1823 

-4.17 

0.86 

0.11 

-1.72 

0.20 

-0.97 

-1.05 

0.43 

0.38 

0.02 

-0.61 

1.05 

1823 

1824 

0.92 

0.38 

-1.02 

-2.10 

-1.74 

-1.07 

-0.14 

-0.51 

0.97 

-0.26 

1.44 

3.93 

1824 

1825 

2.80 

0.39 

-1.05 

2.12 

0.93 

0.56 

0.51 

0.32 

1.31 

0.21 

3.09 

4.15 

1825 

1826 

-3.57 

-0.34 

1.39 

0.17 

-1.04 

1.05 

1.99 

3.61 

1.61 

1.38 

-0.2S 

0.92 

1826 

1827 

0.09 

-4.95 

1.00 

1.31 

1.20 

1.05 

2.06 

-0.57 

0.93 

1.35 

-1.30 

2.93 

1827 

1823 

2.12 

0.27 

0.51 

0.31 

-0.77 

0.39 

0.85 

-2.47 

-1.95 

-0.20 

0.61 

2.28 

1828 

1829 

-0.85  1-3.13 

-1.38 

0.20 

-1.14 

-1.11 

-0.20 

-2.37 

-1.35 

-1.41 

-3.79 

-5.79 

1829 

1830 

-5.98 

-3.61 

1.17 

0.77 

-0.12 

-0.94 

0.50 

-1.28 

-1.05 

-0.88 

1.14 

-0.58 

1830 

1831 

-2.09 

-0.82 

0.70 

3.60 

-0.48 

-1.36 

-0.09 

-0.12 

-1.57 

2.40 

2.27 

0.26 

1831 

1832 

0.77 

1.28 

0.09 

0.21 

-2.45 

-0.87 

-1.18 

0.59 

-0.98 

0.16 

-0.71 

0.25 

1832 

1833 

-3.05 

3.32 

0.21 

-1.45 

2.29 

1.06 

-1.70  -3.06 

-2.01 

-0.90 

2.78 

3.95 

1833 

1834 

5.52 

-0.43 

-0.25 

-1.69 

0.99 

0.44 

4.89  2.48 

1.21 

0.50 

0.74 

1.36 

1834 

1 

I 

Means. 

|-,« 

-0.09 

3.09 

7.55 

11.94 

13.72 

14.88  14.62 

11.69J  7.11 

2.22-0.71 

Means.  [ 

The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

98 


*  LXXXV. 

SOUTH  GERMANY.  —  STUTTGARD. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 


Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

o 

0 

0 

o 

o 

0 

0 

o 

0 

c 

o 

0 

1792 

0.64 

-1.23 

1.78 

1.36 

-1.12 

-0.30 

1.04 

1.70 

-0.70 

1.30 

-0.73 

0.44 

1792 

1793 

-1.41 

1.64 

0.37 

-1.36 

-1.24 

-0.31 

2.52 

1.84 

-0.84 

1.71 

0.66 

2.10 

1793 

1794 

2.02 

3.72 

2.76 

3.26 

0.41 

1.30 

2.75 

0.12 

-1.34 

0.32 

0.85 

-1.72 

1794 

1795 

-4.88 

0.36 

0.65 

2.81 

0.64 

1.43 

-1.01 

1.33 

1.93 

3.69 

-0.49 

3.76 

1795 

1796 

6.17 

1.90 

-2.51 

-0.67 

-0.32 

0.10 

-0.36 

0.23 

2.34 

0.13 

-0.87 

-2.18 

1796 

1797 

2.46 

0.08 

-0.27 

1.88 

1.16 

-1.30 

2.86 

1.01 

1.04 

0.36 

1.82 

3.02 

1797 

1798 

0.65 

1.44 

0.69 

1.16 

0.66 

1.21 

0.14 

0.66 

1.36 

0.53 

0.33 

-2.05 

1798 

1799 

-3.46 

1.77 

-0.78 

-1.30 

-0.89 

-0.75 

-0.98 

0.32 

-0.04 

-0.15 

0.42 

-4.70 

1799 

1800 

3.03 

-0.92 

-2.04 

4.56 

2.03 

-1.81 

0.00 

0.79 

0.84 

-0.37 

1.61 

-0.18 

1800 

1801 

3.95 

0.97 

1.98 

0.24 

0.94 

-0.54 

0.91 

1.42 

2.32 

2.89 

1.30 

1.46 

1801 

1802 

-2.55 

-0.02 

0.80 

2.13 

0.23 

1.53 

-0.24 

2.22 

0.62 

2.08 

0.81 

1.41 

1802 

1803 

-0.81 

-1.90 

-1.31 

1.49 

-2.28 

0.05 

1.21 

1.28 

-1.78 

-0.90 

0.46 

1.36 

1803 

1804 

4.61 

-0.98 

-J.05 

-0.22 

0.78 

0.92 

-0.35 

-0.66 

2.88 

0.74 

0.56 

-1.56 

1804 

1805 

-1.03 

-0.28 

-0.60 

-1.38 

-2.16 

-1.35 

-1.28 

-1.44 

0.38 

-2.73 

-2.47 

0.06 

1805 

1806 

-2.78 

2.77 

1.10 

-1.99 

1.37 

-0.27 

-0.62 

-0.59 

-0.27 

0.03 

1.67 

4.85 

1806 

1807 

0.76 

1.58 

-2.43 

-1.14 

-1.02 

-0.21 

2.15 

3.23 

-0.74 

1.71 

1.37 

-0.94 

1807 

1808 

1.95 

-1.23 

-3.55 

-1.35 

1.96 

-0.98 

0.54 

0.77 

-0.34 

-1.49 

-0.17 

-4.02 

1808 

1809 

1.56 

3.64 

0.69 

-2.58 

0.84 

-0.65 

-0.36 

0.16 

0.30 

-1.05 

-1.65 

2.12 

1809 

1810 

-1.56 

-2.45 

2.11 

-4.12 

-0.25 

-0.95 

-0.26 

-0.48 

2.08 

0.09 

1.44 

0.97 

1810 

1811 

-3.01 

0.49 

2.31 

0.97 

1.41 

1.41 

0.75 

-0.38 

-0.04 

3.02 

1.28 

-0.04 

1811 

1812 

-2.36 

1.26 

-0.23 

-3.17 

0.64 

0.37 

-1.85 

-1.17 

-0.49 

0.01 

-2.28 

-4.81 

1812 

1813 

-2.25 

0.28 

-0.42 

0.53 

0.13 

-1.45 

-1.96 

-3.00 

-1.63 

-0.34 

-1.15 

-0.70 

1813 

1814 

-1.96 

-3.96 

-3.67 

1.09 

-2.14 

-1.52 

0.26 

-0.76 

-1.56 

-1.34 

0.69 

2.13 

1814 

1815 

-1.92 

1.26 

2.15 

0.39 

0.71 

-0.42 

-1.95 

-1.44 

-0.48 

0.03 

-2.30 

-1.44 

1815 

1816 

0.69 

-2.37 

-0.60 

-0.68 

-2.22 

-2.63 

-2.45 

-2.34 

-0.85 

-0.17 

-2.45 

-0.82 

1816 

1817 

3.31 

1.47 

-0.71 

-3.71 

-1.78 

0.92 

-1.54 

-0.97 

1.08 

-3.25 

1.01 

-0.49 

1817 

1818 

2.67 

0.40 

0.41 

1.33 

-0.82 

1.06 

0.15 

-0.91 

-0.70 

-0.91 

1.62 

-2.04 

1818 

1819 

-0.61 

1.54 

0.89 

1.21 

0.29 

0.36 

1.02 

0.36 

-0.92 

-0.02 

-0.95 

1.16 

1819 

1820 

-1.64 

-0.06 

-2.16 

1.31 

-0.05 

-1.91 

-1.37 

1.10 

-1.84 

-1.11 

-2.81 

-0.66 

1820 

1821 

2.13 

-2.72 

0.19 

1.52 

-1,98 

-2.26 

-1.97 

0.15 

0.77 

-0.62 

2.42 

3.25 

1821 

1822 

2.11 

1.58 

2.61 

0.51 

1.43 

2.90 

0.08 

-0.85 

-0.48 

1.33 

1.82 

-3.09 

1822 

1823 

-2.76 

1.25 

-0.05 

-0.77 

0.92 

-1.42 

-1.19 

0.25 

-0.38 

-1.03 

-1.37 

1.70 

1823 

1824 

0.79 

0.79 

-0.89 

-1.61 

-1.05 

-0.98 

0.30 

-0.39 

0.68 

0.44 

2.52 

3.81 

1824 

1825 

1.92 

-0.37 

-1.36 

1.85 

0.27 

0.26 

0.19 

0.02 

-0.61 

-0.64 

1.27 

2.74 

1825 

1826 

-4.81 

1.06 

1.16 

0.19 

-0.93 

0.54 

1.70 

1.78 

1.51 

1.43 

-1.07 

0.54 

1826 

1827 

-0.49 

-5.36 

1.47 

1.22 

1.60 

0.23 

1.10 

-0.45 

0.08 

0.67 

-2.41 

2.98 

1827 

1828 

3.10 

-0.35 

0.61 

0.54 

0.43 

0.97 

1.02  -1.10 

0.07  -0.61  -0.17 

1.19 

1828 

1829 

-2.45  -3.10 

-0.58 

0.46 

-0.36 

-0.61 

0.45-1.13 

-1.50  -1.66  -2.88 

-5.91 

1829 

E 


The  numbers  without  sign  must  be  subtracted  ;  those  with  the  sign  —  must  be  addeJ. 

99 


LXXXV. 

SOUTH  GERMANY.  —  STUTTGARD  (continued). 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

o 

o 

0 

o 

0 

0 

0 

0 

o 

0 

0 

0 

1830 

-6.40 

-3.47 

1.62 

2.06 

0.90 

-0.38 

1.05 

0.00 

-  .43 

-0.89 

0.90 

-0.74 

1830 

1831 

-0.73 

1.25 

1.68 

1.44 

-0.11 

-0.09 

1.22 

-0.10 

-  .15 

2.92 

0.15 

1.26 

1831 

1832 

0.10 

-0.76 

-0.64 

0.13 

-0.93 

-0.59 

-0.22 

0.75 

-  .05 

-0.78 

-1.41 

0.05 

1832 

1833 

-2.56 

2.99 

-0.99 

-1.31 

3.38 

2.06 

-1.46 

-2.81 

-  .35 

-1.03 

-0.13 

3.18 

1833 

1834 

5.05 

0.14 

-0.60 

-1.87 

2.16 

1.33 

2.74 

0.90 

.73 

-0.06 

0.12 

-0.27 

1834 

1835 

1.53 

1.20 

-0.15 

-0.90 

-0.53 

0.28 

1.62 

-0.21 

0.60 

-1.20 

-3.22 

-2.85 

1835 

1836 

0.45 

-1.27 

3.18 

-0.90 

-2.14 

0.64 

0.22 

0.46 

-1.21 

0.47 

-0.01 

1.04 

1836 

1837 

0.90 

0.24 

-2.68 

-2.84 

-2.23 

1.16 

-1.19 

1.17 

-1.94 

-0.60 

-0.40 

0.04 

1837 

1838 

-4.43 

-2.08 

0.21 

-2.32 

-0.45 

-0.03 

-0.36 

-0.90 

0.64 

-0.36 

1.03 

-1.34 

1838 

1839 

0.78 

-0.03 

-1.31 

-2.71 

-1.07 

2.30 

0.58 

-1.55 

0.64 

0.84 

1.07 

1.95 

1839 

1S40 

1.82 

0.15 

-2.90 

1.36 

0.29 

0.16 

-1.42 

-0.23 

-0.26 

-2.39 

1.10 

-5.61 

1840 

1841 

0.89 

-1.98 

2.09 

0.53 

3.42 

-1.55 

-1.83 

-0.69 

1.65 

1.24 

1.22 

2.85 

1841 

1842 

-1.50 

-1.05 

1.36 

-0.47 

1.35 

1.74 

0.35 

2.64 

0.07 

-2.47 

-1.82 

-0.20 

1842 

1843 

2.07 

1.54 

0.15 

0.60 

-1.06 

-1.48 

-0.68 

0.20 

-0.15 

0.02 

0.67 

0.23 

1S43 

1844 

0.31 

-0.91 

-0.30 

1.42 

-1.01 

1.39 

-1.99 

-2.17 

0.56 

0.39 

0.91 

-3.18 

1844 

Means. 

-0.80 

1.64 

3.97 

7.80 

11.87 

14.03 

15.48 

15.02 

12.05i 

8.05 

4.11 

1.25 

Means. 

LXXXVI.  SOUTH  GERMANY  —  CARLSRUHE. 

1779 
1780 

-3.98 
-2.23 

1.18 
-2.20 

1.26 
3.27 

2.19 
-1.17 

1.14 

0.52 

-0.64 
0.41 

0.80 
0.27 

1.72 
1.39 

2.40 
0.18 

2.75 
0.83 

1.71 
0.00 

2.94 
-1.32 

1779 
1780 

1781 

0.45 

1.82 

0.99 

2.26 

0.87 

1.63 

0.63 

1.20 

1.11 

-0.94 

-0.38 

1.09 

1781 

1782 

3.13 

-3.95 

-0.67 

-1.10 

-1.44 

0.93 

1.00 

-1.62 

-1.69 

-2.0S 

-3.90 

-1.07 

1782 

1783 

3.33 

1.35 

-1.60 

0.05 

-0.14 

0.47 

1.69 

-0.38 

-0.71 

-0.35 

-1.04 

-3.26 

1783 

1784 

-4.85 

-3.17 

-1.67 

-2.72 

0.42 

-0.13 

-0.48 

-1.97 

-0.63 

-3.71 

-0.71 

-2.14 

1784 

1785 

-0.27 

-3.06 

-5.49 

-3.26 

-1.28 

-0.44 

-0.46 

.  . 

.  . 

.  . 

-0.63 

-0.60 

1785 

1786 

.  . 

.  . 

.  . 

0.76 

-1.35 

1.20 

-1.77 

.  . 

.  . 

-1.97 

-3.13 

-0.18 

1786 

1788 

-S  65 

1788 

1789 

-0.91 

1.74 

-3.15 

2.19 

-1.49 

0.34 

-0.14 

-1.17 

0.91 

1789 

1798 

0.20 

0.39 

0.59 

0.55 

0.14 

-1.90 

1798 

1799 

-3.09 

0.92 

-0.59 

-1.15 

-1.43 

-0.70 

-0.60 

0.20 

0.01 

0.12 

-0.12 

-4.22 

1799 

1800 

2.53 

-1.60 

-2.25 

3.40 

1.46 

-2.10 

-0.26 

1.20 

0.89 

-0.43 

1.15 

0.21 

1800 

1801 

3.13 

0.6S 

1.95 

0.32 

0.98 

-0.98 

-0.15 

-0.49 

0.76 

0.98 

1.17 

2.21 

1801 

1802 

-2.69 

0.64 

0.83 

1.08 

-0.60 

1.37 

-0.97 

2.33 

0.23 

1.38 

-0.38 

0.53 

1802 

1803 

-1.27 

-2.92 

-1.30 

1.11 

-2.75 

-0.71 

0.63 

0.54 

-2.37 

-0.90 

0.52 

1.99 

1803 

1804 

4.53 

-1.30 

-1.12 

-0.47 

0.94 

0.96 

-0.56 

-0.70 

0.10 

0.90 

0.08 

-2.05 

1804 

1805 

-1.49 

-0.61 

-0.70 

-0.89 

-1.66 

-0.76 

-1.21 

-1.17 

0.16 

-2.18 

-2.92 

-0.39 

1805 

1806 

4.11 

1.89 

0.58 

-2.23 

1.41 

-0.09 

0.03 

-0.35 

-0.36 

-0.67 

1.62 

4.71 

1806 

The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

E  100 


LXXXVI. 

SOUTH  GERMANY.  —  CARLSRUHE  (continued). 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Ncv. 

Dec. 

Year. 

o 

o 

0 

0 

0 

0 

o 

o 

o 

0 

0 

o 

1307 

0.02 

1.11 

-2.83 

-1.34 

1.19 

-0.28 

2.34 

3.15 

-1.57 

1.30 

1.21 

-0.53 

1807 

1808 

1.38 

-1.25 

-3.54 

-1.63 

2.40 

-0.41 

1.94 

0.96 

-0.54 

-1.28 

-0.24 

-3.75 

1808 

1809 

1.24 

3.25 

0.52 

-3.16 

0.41 

-1.22 

-0.61 

-0.33 

-0.80 

-1.36 

-1.90 

1.60 

1809 

1810 

-3.  191-2.78 

1.26 

-0.17 

-0.60 

-0.62 

-0.65 

-0.46 

1.58 

-0.05 

0.84 

1.69 

1810 

1811 

-2.40 

1.17 

2.79 

1.65 

2.32 

1.55 

0.78 

-0.29 

0.53 

2.92 

1.21 

0.48 

1811 

1812 

-2.09 

1.47 

-0.16 

-2.96 

0.83 

-0.50 

-1.53 

-0.27 

-0.24 

1.33 

-1.42 

-3.80 

1812 

1813 

-0.84 

2.15 

0.57 

1.50 

0.12 

-1.01 

-1.75 

-1.78 

-1.15 

0.27 

-0.11 

-0.89 

1813 

1814 

-1.51 

-3.24 

-1.56 

1.82 

-1.68 

-1.66 

0.07 

-1.12 

-1.07 

-0.68 

0.82 

2.67 

1814 

1815 

-2.35 

2.31 

2.67 

0.75 

1.10 

-0.57 

-1.75 

-1.03 

0.09 

0.62 

-1.99 

-1.02 

1815 

1816 

1.38 

-2.00 

-0.27 

0.27 

-2.23 

-2.48 

-2.61 

-2.16 

-0.89 

-0.33 

-2.14 

0.17 

1816 

1817 

3.56 

2.16 

-0.36 

-3.14 

-1.63 

0.87 

-1.47 

-1.40 

1.60 

-2.82 

1.78 

0.13 

1817 

1818 

2.91 

1.12 

0.59 

1.53 

-1.44 

1.00 

0.34 

-1.01 

-0.50 

-0.63 

1.49 

-2.11 

1818 

1819 

1.85 

1.30 

0.75 

1.42 

0.49 

0.15 

0.42 

0.64 

0.49 

-0.15 

-0.75 

0.31 

1819 

1820 

-1.09 

0.55 

-1.35 

2.19 

0.22 

-2.16 

-0.96 

0.66 

-1.20 

-0.61 

-1.80 

0.00 

1820 

1821 

2.31 

-1.59 

0.73 

1.78 

-1.87 

-2.01 

-2.03 

0.14 

0.17 

-0.68 

2.72 

3.52 

1821 

1822 

2.52 

2.96 

4.04 

1.75 

2.11 

3.77 

0.56 

-0.14 

0.46 

1.19 

2.66 

-1.31 

1822 

1823 

-2.23 

2.20 

1.05 

-0.09 

1.23 

-1.02 

-1.14 

0.87 

0.24 

-0.27 

-0.11 

2.95 

1823 

1824 

1.39 

1.98 

-0.10 

-0.89 

-1.13 

-0.65 

0.32 

-0.22 

1.04 

0.66 

2.68 

4.09 

1824 

1825 

1.92 

0.28 

-0.76 

1.43 

-0.15 

-0.41 

0.85 

0.49 

1.15 

0.15 

1.51 

3.05 

1825 

1826 

-3.48 

1.35 

1.13 

0.20 

-1.25 

1.06 

2.12 

2.86 

1.75 

1.94 

-0.21 

0.93 

1826 

1827 

-0.55 

-5.10 

1.19 

1.50 

1.25 

1.01 

2.06 

0.00 

1.15 

1.34 

-2.01 

2.85 

1827 

1828 

3.18 

0.41 

1.17 

0.82 

0.74 

1.19 

0.91 

-1.22 

0.48 

0.28 

-0.33 

1.85 

1828 

1829 

-2.12 

-2.33 

-0.05 

0.72 

-0.04 

0.21 

0.50 

-1.17 

-0.88 

-0.60 

-1.88 

-4.97 

1829 

1830 

-5.83 

-2.98 

2.14 

2.21 

0.81 

-0.22 

0.86 

-0.13 

-1.01 

-0.17 

1.31 

-0.32 

1830 

1831 

-0.98 

0.96 

1.68 

1.83 

-0.50 

-0.61 

0.38 

0.40 

-0.81 

3.26 

0.30 

1.64 

1831 

1832 

0.10 

-0.27 

0.23 

0.96 

-0.88 

-0.49 

-0.01 

1.02 

-0.59 

0.18 

-0.68 

0.95 

1832 

1833 

-2.63 

3.41 

-0.71 

-0.78 

2.94 

1.45 

-1.24 

-2.23 

-1.08 

-0.17 

0.51 

4.43 

1833 

1834 

5.74 

0.29 

0.76 

-1.12 

1.87 

1.12 

2.76 

1.35 

1.82 

0.53 

0.79 

0.29 

1834 

1835 

1.77 

1.74 

0.11 

-0.90 

-0.68 

0.13 

1.46 

-0.17 

-0.03 

-0.83 

-2.92 

-2.23 

1835 

1836 

0.43 

-0.85 

3.27 

-0.66 

-1.99 

0.47 

0.21 

0.47 

1.67 

0.82 

0.66 

1.56 

1836 

1837 

1.30 

0.80 

-1.86 

-2.33 

-2.05 

1.26 

-0.86 

1.24 

-1.66 

0.28 

0.46 

0.72 

1837 

1838 

-4.35 

-2.13 

0.21 

-2.36 

-0.33 

-0.21 

-0.36 

-1.20 

0.44 

-0.02 

1.10 

-0.52 

1838 

1839 

0.88 

0.67 

-0.73 

-2.24 

-0.54 

2.28 

0.16 

-0.47 

0.09 

1.20 

1.49 

2.20 

1839 

1840 

1.37 

-0.69 

-2.82 

1.28 

-0.51 

0.23 

-1.39 

0.34 

-0.22 

-2.04 

1.81 

-5.32 

1840 

Means. 

-0.17 

1.95 

4.39 

8.31 

12.40 

14.43 

15.80 

15.41 

12.60 

8.30 

4.16 

1.35 

Means. 

E 


The  numbers  without  sign  must  be  subtracted  ;  those  with  the  sign  —  must  be  added. 

101 


LXXXVIT. 

NORTH  GERMANY.  —  BERLIN. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

0 

0 

0 

o 

o 

0 

0 

o 

o 

c 

0 

0 

1719 

2.44 

0.21 

1.50 

0.69 

1.45 

2.38 

3.13 

1.86 

0.08 

0.66 

2.09 

-1.02 

1T19 

1720 

2.27 

0.40 

-0.14 

0.70 

1.34 

0.94 

2.01 

0.31 

0.10 

1.62 

-0.03 

1.47 

1720 

1721 

2.38 

-1.80 

-1^53 

2.23 

-0.91 

1.21 

-0.67 

-0.17 

0.54 

0.40 

1.69 

0.07 

1721 

1728 

1.50 

-2.28 

2.39 

0.65 

1.24 

0.26 

-0.38 

-1.36 

-0.10 

0.66 

-0.58 

-1.51 

1728 

1729 

—3.18 

—1.46 

—3.57 

-2.11 

1729 

1730 

1.64 

0.20 

0.29 

0.70 

0.00 

0.12 

-0.62 

-0.03 

-0.69 

-2.55 

1.99 

-0.48 

1730 

1731 

-2.00 

-1.78 

-0.67 

-1.67 

-1.33 

-0.89 

-1.44 

-0.62 

-0.25 

1.85 

0.67 

0.26 

1731 

1732 

-1.50 

1.34 

1.05 

1.34 

0.29 

-1.54 

-1.95 

-0.98 

-0.84 

1.14 

-0.78 

-3.99 

1732 

1733 

2.69 

2.54 

0.86 

1.59 

-1.77 

-2.71 

-0.38 

-0.97 

-2.02 

-0.53 

0.21 

2.46 

1733 

1734 

0.40 

2.51 

1.86 

0.55 

-0.54 

-1.26 

-0.62 

-0.93 

-0.54 

0.65 

-2.85 

-1.03 

1734 

1735 

1.79 

0.30 

1.81 

1.49 

-0.87 

-0.33 

-1.38 

-0.84 

0.91 

-1.01 

-1.07 

-0.17 

1735 

1736 

-0.08 

-0.92 

-0.73 

0.85 

-0.88 

-0.87 

-0.24 

0.64 

-0.98 

0.23 

-0.09 

1.18 

1736 

1737 

1.83 

0.55 

1.57 

-1.36 

0.77 

0.11 

-0.77 

-1.65 

-0.10 

-0.39 

-0.83 

-0.05 

1737 

1738 

-0.55 

0.55 

1.11 

1.54 

-0.08 

-0.42 

-0.79 

-0.38 

-0.05 

0.88 

-2.21 

0.90 

1738 

1739 

-0.17 

2.06 

1.11 

-1.65 

0.64 

-0.96 

0.99 

-1.23 

0.91 

-2.62 

-5.35 

-0.01 

1739 

1740 

-6.61 

-6.54 

-3.28 

-3.45 

-3.49 

-1.70 

-0.96 

-0.62 

1.62 

-3.12 

-2.35 

-0.18 

1740 

1741 

-0.93 

1.88 

-0.71 

-1.38 

-1.90 

-1.59 

0.17 

-0.54 

-0.20 

1.22 

1.77 

-0.16 

1741 

1742 

-1.23 

1.08 

-0.99 

-2.16 

-1.83 

-0.72 

-0.66 

-1.26 

-1.78 

0.19 

0.70 

-3.22 

1742 

1743 

1.32 

0.99 

-0.53 

-1.94 

0.28 

1.05 

-1.46 

0.32 

-0.50 

-1.44 

2.77 

0.84 

1743 

1744 

-1.98 

-2.42 

-0.09 

2.33 

0.10 

-1.47 

0.25 

-0.60 

0.94 

2.10 

*1.25 

-0.39 

1644 

1745 

-1.92 

-1.26 

-0.10 

0.20 

0.73 

1.01 

0.01 

0.17 

0.10 

1.15 

2.17 

-2.36 

1745 

1746 

0.12 

0.03 

-1.88 

-0.39 

0.43 

-0.72 

1.41 

-0.43 

0.44 

-1.06 

-0.53 

1.89 

1746 

1747 

-0.17 

3.49 

-2.09 

0.70 

-0.67 

2.34 

-0.33 

0.18 

1.43 

0.43 

0.21 

1.04 

1747 

1748 

-1.17 

-1.70 

-2.29 

0.22 

1.53 

2.11 

0.56 

2.85 

-0.14 

0.00 

1.79 

3.19 

1748 

1749 

2.28 

0.47 

-1.52 

-0.14 

1.58 

0.21 

0.39 

1.64 

0.33 

0.05 

-0.63 

1.28 

1749 

1750 

1.19 

3.22 

3.87 

1.26 

0.30 

1.06 

1.97 

1.56 

0.26 

-0.55 

.  . 

-0.06 

1750 

1751 

-0.45 

-1.70 

2.79 

-0.86 

3.59 

2.39 

1.78 

3.12 

0.42 

-0.04 

1751 

Means. 

-0.19 

0^69 

2.65 

6.51 

10.63 

12.82 

14.02 

13.14 

11.06 

6.53 

3.15 

1.24 

Means. 

1755 

-4.56 

-6.47 

0.54 

> 

p 

-0.25 

.  . 

.  f 

.  . 

2.14 

1755 

1756 

4.13 

2.63 

1.85 

1.77 

0.37 

2.55 

1.50 

-0.35 

1.61 

1.62 

-0.38 

-1.43 

1756 

1757 

1.17 

2.37 

1.71 

.  . 

-0.39 

1.47 

3.25 

0.22 

-1.70 

-2.88 

1.21 

-1.25 

1757 

1758 

-2.57 

-0.17 

0.13 

-0.21 

1.08 

0.18 

-0.86 

0.55 

-1.11 

-0.97 

0.16 

0.38 

1758 

1759 

3.26 

1*79 

1.18 

-0.01 

-1.45 

0.87 

1.15 

0.60 

-0.45 

1.09 

-2.21 

-3.85 

1759 

1760 

-0.56 

-1.48 

-0.81 

0.34 

0.33 

0.57 

-e.29 

0.03 

0.87 

0.98 

0.12 

2.05 

1760 

1761 

0.97 

1.65 

2.51 

-0.01 

1.55 

1.95 

-0.62 

1.88 

2.30 

-1.02 

-0.12 

-3.08 

1761 

1762 

2.11 

-0.01 

-1.88 

1.88 

0.42 

0.27 

-0.19 

-1.45 

0.23 

-1.34 

-0.32 

-1.82 

1762 

1763 

-2.25 

3.02 

-0.40 

-0.55 

-0.34 

0.17 

0.92 

1.32 

-0.86 

-0.87 

-0.25 

2.67 

1763 

1764 

2.91 

2.SS 

-0.10 

-0.30 

1.71 

-1.94 

1.43 

-0.60 

-1.70 

-0.63 

-1.32 

-1.54 

1764 

1765 

1.64 

-2.90 

1.70 

0.78 

-2.50 

-0.88 

-1.92 

1.12 

-1.16 

1.20 

0.15 

0.03 

1765 

1766 

-0.10 

-0.12 

1.01 

2.07 

1.17 

0.30 

-0.36 

-0.25 

0.73 

-0.43 

0.48 

-0.26 

1766 

1767 

-5.54 

1.74 

0.01 

-1.58 

-1.03 

-1.65 

-0.23 

0.88 

0.42 

0.95 

2.03  -1.75 

1767 

E 


The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

102 


LXXXVII. 

NORTH  GERMANY.  —  BERLIN  (continued). 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

1768 

0 

-3.52 

-0.98 

o 
-1.28 

o 
-0.11 

o 
-0.68 

0 

-0.06 

c 
0.28 

0 

-o.os 

0 

-1.03 

0 

-0.48 

0 

0.54 

0 

0.47 

1768 

1769 

1.22 

-0.74 

0.75 

0.14 

-1.01 

-1.01 

-0.71 

-1.07 

0.58 

-2.26 

0.26 

0.84 

1769 

1770 

-0.20 

-0.21 

-3.16 

-1.09 

-0.11 

-1.20 

-0.35 

-0.08 

0.62 

0.81 

0.16 

1.92 

1770 

1771 

-1.24 

-3.28 

-3.40 

-3.27 

2.04 

-0.21 

-0.82 

-2.12 

-0.46 

0.76 

-1.47 

0.95 

1771 

1772 

0.66 

1.20 

0.86 

-0.86 

-2.50 

-0.10 

-1.40 

-0.41 

0.60 

1.62 

1.89 

1.38 

1772 

1773 

2.50 
-0.13 

-1.00 

-0.61 

0.49 

1.37 

-1.22 

-0.85 

0.06 
15.34 

0.57 

1.89 

-0.92 

2.21 

1773 

Means. 

1.64 

3.87 

7.71 

11.94 

15.23 

16.18 

12.12 

7.73 

4.38 

1.85 

Means. 

1774 

1.50 

2.26 

2.29 

1.56 

-0.05 

0.69 

-1.56 

-1.92 

-1.61 

0.71 

-3.70 

-0.75 

1774 

1775 

0.95 

3.20 

2.53 

-0.65 

-0.72 

3.26 

1.88 

1.61 

2.00 

1.23 

-0.84 

2.16 

1775 

1776 

-5.55 

2.42 

2.10 

-0.13 

-2.11 

1.19 

1.21 

0.32 

0.12 

-0.47 

0.70 

0.54 

1776 

1777 

0.04 

-1.67 

0.67 

-1.12 

0.52 

0.04 

-0.60 

-0.01 

-1.71 

0.23 

2.23 

0.75 

1777 

1778 

-0.58 

-1.7? 

1.09 

1.98 

0.67 

0.30 

1.02 

0.66 

-0.67 

-1.69 

1.44 

3.84 

1778 

1779 

0.33 

3.82 

2.99 

2.39 

0.61 

-0.30 

0.74 

1.71 

1.59 

1.95 

0.90 

2.26 

1779 

1780 

-1.06 

-2.02 

3.37 

-1.27 

0.72 

0.24 

0.45 

0.99 

-0.03 

1.46 

-0.34 

-0.70 

1780 

1781 

-0.44 

0.53 

2.05 

1.85 

1.19 

1.97 

2.02 

2.56 

1.60 

-0.39 

0.80 

0.01 

1781 

1782 

3.15 

-2.86 

-0.39 

-0.87 

0.33 

1.78 

1.52 

0.21 

1.75 

-0.30 

-1.13 

0.78 

1782 

1783 

3.19 

3.67 

-0.58 

0.86 

1.38 

2.71 

1.45 

0.71 

0.36 

0.34 

0.50 

-1.51 

1783 

1784 

-3.97 

-3-54 

-1.68 

-2.30 

0.58 

0.20 

-0.75 

-1.35 

0.02 

-2.21 

1.29 

-0.94 

1784 

1785 

0.47 

-3.*8 

-5.74 

-2.54 

-1.48 

-0.84 

-0.70 

-1.12 

0.61 

-0.34 

1.09 

-1.42 

1785 

1786 

1.81 

-0.93 

-2.32 

1.60 

-1.25 

0.54 

-1.71 

-1.26 

-1.86 

-1.97 

-3.64 

-0.16 

1786 

1787 

-0.29 

1.38 

2.05 

-1.31 

-0.77 

0.99 

-0.65 

-0.59 

-0.17 

1.32 

0.69 

2.07 

1787 

1788 

2.46 

-1.26 

-1.47 

0.10 

0.45 

1.64 

1.64 

-1.21 

1.20 

-0.35 

-0.79 

-8.64 

1788 

1789 

-1.93 

1.46 

-4.45 

0.01 

1.85 

0.14 

0.11 

0.36 

1.85 

0.64 

0.89 

3.55 

1789 

1790 

3.05 

2.82 

2.19 

-1.67 

1.70 

0.58 

-1.13 

-0.54 

-0.48 

-0.44 

-0.30 

1.92 

1790 

1791 

3.91 

1.52 

1.47 

1.74 

-1.16 

0.19 

0.78 

1.08 

-0.78 

0.22 

-0.89 

1.35 

1791 

1792 

0.53 

-1.89 

0.80 

1.45 

-0.81 

0.83 

1.59 

0.46 

-0.98 

-0.30 

-0.01 

1.14 

1792 

1793 

-0.70 

2.14 

0.61 

-0.68 

-0.58 

-1.34 

1.68 

0.22 

-0.83 

1.99 

0.99 

2.05 

1793 

1794 

1.18 

2.56 

3.66 

3.12 

0.18 

1.77 

2.79 

-0.59 

-1.62 

0.37 

1.53 

-2.14 

1794 

1795 

-5.23 

-0.36 

-0.84 

2.88 

-1.78 

2.10 

-0.92 

-0.37 

1.27 

3.36 

0.10 

3.14 

1795 

1796 

6.51 

0.68 

-1.70 

-0.34 

-0.46 

0.38 

0.48 

1.33 

1.74 

0.07 

-0.60 

-1.82 

1796 

1797 

1.60 

1.89 

0.66 

1.09 

1.41 

-0.23 

1.55 

1.26 

2.02 

0.55 

-0.80 

1.81 

1797 

1798 

1.79 

1.57 

-0.07 

1.29 

0.76 

1.20 

0.38 

0.92 

1.24 

-0.17 

-0.45 

-3.54 

1798 

1799 

-2.97 

-4.47 

-1.65 

-2.12 

-227 

-1.53 

-1.05 

-0.32 

-0.65 

-0.70 

0.48 

-4.41 

1799 

1800 

-1.12 

-3.61 

-4.09 

4.43 

2.33 

-3.06 

-1.99 

0.22 

0.67 

-0.41 

1.47 

o.oo 

1800 

1801 

1.88 

-1.02 

1.84 

0.05 

3.00 

-1.37 

-0.61 

-0.68 

1.01 

1.40 

0.93 

0.84 

1801 

1802 
1803 

-1.00 
-5.33 

0.50 
2.02 

1.65 
-0.16 

0.45 
2.84 

-2.37 
-1.36 

-1.01 
-1.46 

-1.54 
2.03 

1.54 

1.80 

-0.08 
-1.82 

3.04 
-0.45 

0.78 
0.68 

1.81 
-0.39 

1802 
1803 

1804 

1.51 

-1.48 

-3.11 

-1.06 

1.04 

-0.54 

0.10 

-0.73 

1.17 

-0.02 

-2.40 

-3.92 

180-1 

1805 

-3.90 

-1.94 

-0.48 

-1.58 

1.36 

-1.53 

-1.18 

-1.83 

0.55 

-3.53 

-2.58 

1.24 

1805 

1806 

1807 

3.02 
1.62 

0.94 
0.18 

0.19 
-1.97 

-2.82 
-1.43 

0.99 
-0.42 

-2.26 
-1.50 

-1.35  -0.98 
0.42  3.72 

0.41 
-2.15 

-0.12 

0.08 

1.47 
1.11 

4.14 
1.53 

1806 
1807 

The  numbers  without  sign  must  be  subtracted;  those  with  the  sign  —  must  be  added. 

103 


LXXXVII. 

NORTH  GERMANY.  —  BERLIN  (continued). 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

0 

o 

0 

o 

0 

0 

o 

0 

o 

o 

0 

o 

180S 

0.83 

-1.07 

-3.39 

-2.80 

0.80 

-0.42 

1.19 

0.69 

-0.54 

-1.56 

-1.10 

-4.40 

1808 

1809 

-3.31 

1.64 

-1.09 

-3.34 

0.99 

-0.89 

-0.48 

0.36 

0.29 

-0.99 

0.02 

2.23 

1809 

1810 

-0.99 

-1.66 

0.40 

-1.41 

-1.88 

-1.93 

-0.05 

-0.47 

1.16 

-1.33 

0.09 

1.22 

1810 

1811 

-2.93 

-0.72 

2.01 

-0.15 

3.07 

2.67 

0.94 

-0.59 

-0.72 

2.21 

0.35 

1.50 

1811 

1812 

-1.14 

-0.27 

-1.05 

-3.98 

-1.20 

-0.68 

-2.37 

-0.78 

-1.81 

1.14 

-1.57 

-5.52 

1812 

1813 

-1.20 

2.38 

0.24 

1.00 

-0.73 

-1.23 

-1.27 

-2.07 

-0.82 

-1.30 

0.05 

1.02 

1813 

1814 

-2.12 

-5.52 

-2.78 

1.00 

-2.92 

-1.99 

1.02 

-1.34 

-2.23 

-1.21 

0.55 

1.26 

1814 

1815 

-2.81 

1.14 

1.56 

-0.45 

-0.15 

0.61 

-2.98 

-1.57 

-1.95 

0.42 

-0.69 

-1.37 

1815 

1816 

0.95 

-2.27 

-0.6S 

-0.21 

-2.68 

-1.54 

-1.32 

-2.59 

-1.64 

-1.23 

-1.96 

-0.39 

1816 

1817 

2.58 

1.79 

-0.19 

-3.86 

-0.49 

1.04 

-1.57 

-0.55 

1.43 

-2.57 

2.37 

-0.14 

1817 

1818 

2.54 

0.19 

1.56 

0.53 

0.22 

0.95 

0.72 

-1.41 

0.14 

-0.58 

-0.60 

-0.89 

1818 

1819 

2.51 

1.57 

1.59 

0.85 

1.00 

2.28 

1.42 

1.60 

0.81 

-0.41 

-0.66 

-2.61 

1819 

1820 

-3.08 

0.34 

-0.02 

1.52 

0.91 

-2.38 

-2.08 

1.23 

-0.75 

0.99 

-1.57 

-1.88 

1820 

1821 

1.52 

-1.05 

0.14 

3.28 

-0.48 

-2.17 

-1.51 

-0.78 

0.91 

1.33 

3.27 

3.44 

1821 

Means. 

-1.59 

0.30 

2.28 

6.89 

11.36 

13.73 

15.16 

15.00 

11.83 

7.16 

2.61 

-0.32 

Means. 

1822 

3.39 

3.67 

3.22 

1.55 

0.59 

0.58 

0.77 

-0.19 

-1.24 

1.36 

1.58 

-3.18 

1822 

1823 

-7.56 

-0.25 

0.41 

-1.32 

-0.26 

-0.78 

-1.76 

1.03 

-0.34 

0.66 

1.01 

1.12 

1823 

1824 

3.67 

2.45 

0.29 

-0.52 

-1.04 

-0.75 

-0.56 

-0.58 

1.27 

0.56 

1.96 

2.69 

1824 

1825 

3.92 

0.92 

-2.26 

0.86 

-0.15 

-1.10 

-0.47 

0.05 

0.54 

-0.12 

•1.30 

2.03 

1825 

1826 

-3.44 

1.98 

1.15 

-0.19 

-0.24 

1.20 

3.03 

3.00 

0.35 

0.71 

-0.33 

0.49 

1826 

,1827 

0.25 

-4.90 

1.25 

2.29 

1.98 

1.33 

0.80 

-0.04 

1.09 

0.83 

-2.24 

1.16 

1827 

1828 

-0.26 

-0.55 

0.67 

1.22 

0.33 

0.30 

1.17 

-0.71 

-0.15 

-0.28 

0.17 

0.47 

1828 

1829 

-2.87 

-2.67 

-1.23 

0.41 

-0.29 

0.12 

0.41 

-0.56 

-0.16 

-1.62 

-2.54 

-8.25 

1829 

1830 

-4.21 

-2.70 

1.09 

1.53 

0.30 

0.07 

0.35 

-0.26 

-0.57 

-0.69 

1.47 

-1.79 

1830 

1831 

-1.81 

0.75 

0.40 

2.21 

-0.94 

-1.34 

0.36 

0.20 

-1.22 

1.77 

-0.54 

0.11 

1831 

1832 

0.76 

1.12 

0.42 

0.32 

-1.43 

-0.33 

-2.40 

0.22 

-1.22 

-0.35 

-0.63 

-0.24 

1832 

1833 

-0.86 

3.16 

-0.18 

-1.82 

3.46 

1.33 

-0.45 

-3.12 

-0.48 

-0.93 

0.14 

2.48 

1833 

1834 

4.73 

1.31 

1.00 

-0.68 

1.82 

1.23 

3.65 

2.34 

0.74 

-0.28 

0.56 

0.36 

1834 

1835 

2.81 

2.37 

0.57 

-0.91 

-0.86 

0.13 

0.21 

-0.59 

1.22 

-0.97 

-2.71 

-1.77 

1835 

1836 

1.37 

1.11 

3.42 

0.07 

-2.55 

0.20 

-1.08 

-1.49 

-1.06 

1.00 

-1.10 

0.26 

1836 

1837 

1.91 

0.38 

-1.98 

-1.68 

-1.42 

-0.69 

-1.11 

1.20 

-0.92 

0.37 

0.72 

-0.87 

1837 

1838 

-6.30 

-3.63 

0.42 

-1.42 

-0.24 

0.35 

-0.22 

-1.78 

1.27 

-0.89 

-1.14 

-0.33 

1838 

1839 

0.79 

1.50 

-1.98 

-2.54 

0.58 

0.95 

0.77 

-0.44 

1.10 

0.15 

1.10 

-1.49 

1839 

1840 

-0.09 

0.65 

0.23 

-0.07 

-0.03 

0.16 

0.27 

-0.07 

-0.05 

0.09 

-0.05 

-0.33 

1840 

1841 

-0.01 

-4.03 

0.91 

1.01 

2.51 

-0.88 

-1.10 

-0.01 

0.58 

1.29 

0.75 

1.62 

1841 

1842 

-1.34 

0.39 

0.93 

-1.52 

0.75 

-0.54 

-0.84 

3.13 

0.42 

-1.55 

-2.82 

0.71 

1842 

1843 

2.40 

2.45 

-1.09 

0.44 

-2.01 

-1.00 

-0.41 

1.17 

-0.64 

-0.66 

1.42 

1.96 

1843 

1844 

1.00 

-0.96 

-1.50 

0.48 

0.56 

-1.00 

-2.35 

-1.60 

0.36 

-0.24 

0.56 

2.41 

1844 

1845 

1.65 

-4.55 

-6.24 

0.28 

-1.48 

0.49 

0.90 

-0.94 

-0.93 

-0.18 

1.26 

0.33 

1845 

Means. 

-1.90 

-0.15 

2.74 

6.88 

10.92 

13.94 

15.04 

14.43 

11.75J  7.97 

3.25 

1.32 

Means. 

The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

104 


LXXXVIII. 

DENMARK.  —  COPENHAGEN. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

N07. 

Dec. 

Year. 

1767 

0 

-3.89 

o 
0.34 

o 
0.52 

o 
-1.49 

0 

-1.83 

0 

-1.99 

0 

-1.40 

o 
-0.47 

o 
0.22 

0 

-0.75 

o 
1.58 

-0.29 

1767 

1768 

-0.67 

-0.14 

-1.01 

0.11 

-0.82 

-0.50 

-0.18 

-0.59 

-1.37 

-0.49 

0.57 

1.66 

1768 

1769 

1.74 

0.79 

1.44 

0.30 

-0.70 

-0.50 

-0.42 

-1.21 

-0.17 

-1.92 

0.03 

0.37 

1769 

1770 

0.19 

1.64 

-2.57 

-0.77 

-0.32 

-0.88 

0.21 

0.36 

1.11 

1.38 

-0.48 

0.69 

1770 

1771 

-1.20 

-2.18 

-3.96 

-3.14 

0.27 

1.50 

-0.33 

-2.04 

-0.90 

0.03 

-1.11 

1.10 

1771 

1772 

-0.88 

-1.71 

-2.53 

-1.72 

-1.94 

-0.51 

-0.56 

-0.59 

0.83 

1.49 

2.39 

1.33 

1772 

1773 

1.78 

-0.46 

0.35 

0.33 

0.83 

-0.54 

0.50 

0.81 

0.45 

1.73 

0.81 

0.94 

1773 

1774 

-2.37 

0.34 

0.87 

0.83 

-0.09 

0.37 

0.04 

-0.65 

-1.07 

-0.31 

-5.39 

-2.55 

1774 

1775 

-0.51 

1.79 

1.72 

0.21 

-0.09 

2.13 

1.39 

1.72 

2.60 

0.78 

-1.97 

0.71 

1775 

1776 

-5.22 

1.18 

1.49 

0.73 

-0.87 

1.61 

2.30 

1.35 

0.59 

0.67 

0.77 

0.69 

1776 

1782 

2.38 

-0.61 

-0.99 

-0.62 

-0.63 

3.43 

0.12 

0.32 

0.99 

-1.09 

-1.42 

0.07 

1782 

1783 

0.81 

2.57 

-0.38 

2.01 

1.97 

2.36 

3.05 

1.56 

1.67 

1.91 

-0.06 

-0.87 

1783 

1784 

-2.02 

-0.59 

-2.41 

-1.51 

0.24 

0.07 

-0.31 

-0.21 

0.18 

-0.78 

1.16 

-0.76 

1784 

1785 

0.53 

-2.27 

-2.96 

-1.04 

-1.52 

0.78 

-0.33 

-0.46 

0.10 

-0.05 

1.55 

-0.20 

1785 

1786 

0.13 

0.06 

-2.69 

0.83 

-1.08 

1.48 

-0.35 

-0.41 

-0.74 

-1.21, 

-2.91 

-0.04 

1786 

1787 

0.94 

2.21 

2.09 

-0.20 

0.07 

0.01 

0.06 

-0.31 

0.58 

1.81 

-0.40 

0.26 

1787 

1788 

2.02 

0.63 

-1.14 

0.95 

1.00 

1.28 

-0.93 

0.38 

1.71 

-0.31 

-0.19 

-6.92 

1788 

1798 

1.15 

2.27 

1.31 

2.48 

2.71 

2.06 

2.00 

2.15 

1.09 

1.01 

0.01 

-2.29 

1798 

1799 

-0.71 

-4.50 

-1.94 

-1.59 

—2.12 

-0.44 

-0.18 

-0.43 

0.21 

0.56 

1.27 

-2.55 

1799 

1800 

-0.96 

-2.07 

-3.57 

2.60 

1.77 

-1.69 

-0.89 

0.42 

0.21 

1.19 

1.78 

1.20 

1800 

1801 

1.28 

0.75 

2.82 

1.44 

2.93 

-0.10 

1.30 

0.58 

0.69 

2.17 

1.97 

0.46 

1801 

1802 

-0.56 

1.04 

1.90 

.  . 

-1.78 

-2.26 

-3.12 

-0.56 

-0.87 

0.98 

0.45 

0.32 

1802 

1803 

-3.02 

-1.5S 

-0.39 

1.86 

-1.69 

-2.02 

-0.21 

-0.14 

-1.76 

-0.90 

-0.31 

-1.36 

1803 

1804 

2.01 

-1.47 

-1.82 

-0.58 

0.25 

-0.57 

-0.30 

0.12 

1.23 

0.77 

-1.74 

-2.85 

1804 

1805 

-1.79 

-2.02 

0.26 

-1.03 

-2.14 

-3.46 

-1.48 

-1.03 

0.77 

-2.53 

-0.56 

0.77 

1805 

1806 

1.90 

1.64 

-0.49 

-1.59 

0.03 

-2.28 

-1.79 

-0.08 

1.32 

0.35 

1.27 

2.54 

1806 

1807 

1.75 

1.46 

-0.55 

-0.56 

-0.37 

-1.60 

-0.17 

2.54 

-2.22 

0.02 

0.19 

0.77 

1807 

1808 

1.04 

-0.77 

-1.30 

-1.40 

0.19 

0.02 

1.26 

1.34 

1.10 

-0.14 

-0.85 

-2.42 

1808 

1809 

-2.64 

0.30 

-0.42 

-2.52 

0.60 

-0.91 

-0.89 

0.47 

0.30 

-0.44 

-0.23 

1.65 

1809 

1810 

0.60 

-0.28 

0.05 

-1.19 

-2.69 

-1.01 

-0.07 

-0.29 

0.51 

-0.79 

-0.22 

0.10 

1810 

1811 

-0.65 

0.23 

2.46 

-0.71 

1.75 

0.96 

2.07 

-0.32 

-0.26 

1.28 

1.12 

1.07 

1811 

1812 

0.40 

1.21 

-1.55 

-2.62 

-1.63 

-0.97 

-2.38 

-0.61 

-1.67 

V1.36 

-1.14 

-3.56 

1812 

1813 

0.23 

2.66 

1.50 

0.55 

-1.01 

-1.00 

0.44 

-0.89 

-0.53 

-2.01 

0.20 

0.97 

1813 

1814 

-3.81 

-4.01 

-2.15 

0.28 

-2.99 

-1.97 

0.13 

-0.87 

-1.05 

-0.58 

1.22 

0.85 

1814 

1815 

-0.67 

1.47 

1.82 

0.30 

-0.26 

-1.26 

-1.95 

-0.81 

-1.11 

0.59 

0.20 

-0.66 

1815 

1816 

0.72 

-1.56 

-0.05 

-0.49 

-2.69 

-1.87 

-0.49 

-1.86 

-0.89 

-0.72 

-0.95 

-0.31 

1816 

E 


The  numbers  without  sign  must  be  subtracted  ;  those  with  the  sign  —  must  be  added. 

105 


LXXXVIII. 

DENMARK.  —  COPENHAGEN  (continued). 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

0 

o 

0 

o  • 

0 

0 

o 

0 

o 

o 

o 

o 

1817 

2.79 

2.98 

1.13 

-1.10 

-0.01 

-1.04 

-1.53 

-1.38 

0.62 

-2.24 

1.41 

-1.71 

1817 

1818 

1.99 

1.73 

2.40 

-1.05 

-0.05 

0.97 

1.29 

-0.24 

0.69 

0.87 

1.48 

0.20 

1818 

1819 

3.46 

2.30 

2.39 

1.56 

1.25 

1.69 

1.58 

3.28 

1.46 

-0.79 

-1.03 

-1.26 

1819 

1820 

-1.67 

0.51 

0.52 

1.55 

0.25 

-1.16 

-0.36 

-0.33 

-0.60 

-0.64 

-0.56 

-0.87 

1820 

1821 

0.36 

0.16 

0.24 

2.24 

-0.43 

-1.77 

-1.81 

-0.86 

0.67 

1.62 

1.68 

2.47 

1821 

1822 

2.56 

3.82 

3.64 

2.28 

1.59 

0.87 

0.24 

-0.17 

-0.64 

1.52 

2.63 

0.56 

1822 

1823 

-2.60 

-0.08 

0.70 

-0.04 

0.51 

0.15 

-0.94 

0.41 

0.47 

1.02 

1.88 

1.74 

1823 

1824 

3.65 

2.36 

0.97 

0.91 

0.14 

1.22 

-0.61 

-0.48 

1.62 

0.09 

1.20 

2.18 

1824 

1826 

.  . 

.  . 

.  . 

.  . 

4.30 

5.91 

7.76 

6.63 

.  . 

.  . 

.  . 

2.04 

1826 

1827 

0.16 

-2.30 

0.59 

2.14 

1.44 

1.93 

0.09 

-0.29 

1.48 

1.16 

-1.20 

2.30 

1827 

1828 

-0.07 

0.43 

1.37 

0.58 

1.31 

1.34 

1.36 

0.26 

0.41 

0.46 

0.61 

0.50 

1828 

1829 

-1.14 

-3.06 

-0.95 

-1.00 

1.84 

1.50 

-0.23 

-1.01 

0.03 

-1.43 

-2.91 

-3.60 

1829 

1830 

-2.26 

-2.85 

1.39 

0.69 

-0.18 

-0.86 

0.30 

-0.81 

-0.95 

0.15 

1.75 

-0.22 

1830 

1831 

-1.60 

0.61 

-0.16 

1.87 

0.31 

0.85 

2.52 

1.55 

-0.59 

2.71 

-0.65 

1.91 

1831 

1832 

1.52 

1.73 

1.55 

1.84 

-0.23 

1.29 

-0.94 

-0.06 

-0.98 

0.60 

-0.47 

0.58 

1832 

1833 

0.05 

1.50 

-0.45 

-0.72 

2.32 

0.72 

0.79 

-2.27 

0.08 

0.63 

0.77 

1.32 

1833 

1834 

2.26 

1.71 

2.23 

0.90 

1.98 

0.72 

3.60 

3.26 

0.11 

-0.05 

0.22 

0.59 

1834 

1835 

1.87 

2.J6 

1.66 

-0.02 

-0.92 

1.17 

1.03 

-0.57 

0.09 

-0.85 

-1.44 

-0.88 

1835 

1836 

0.29 

0.63 

2.71 

0.14 

-0.17 

0.24 

-0.89 

-1.86 

-1.62 

-0.48 

-1.34 

0.09 

1836 

1837 

0.17 

0.54 

-1.08 

-1.50 

-1.10 

0.05 

-0.21 

0.60 

-0.80 

-0.06 

-0.91 

-0.75 

1837 

1838 

-2.83 

-4.85 

-0.56 

-2.63 

-0.97 

-0.70 

-0.09 

-2.25 

-0.44 

-1.82 

-2.01 

-0.25 

1838 

1839 

-0.17 

-0.38 

-2.06 

-2.80 

0.49 

0.13 

0.23 

-1.24 

-0.40 

0.11 

-0.19 

-2.12 

1839 

1840 

-0.63 

-0.39 

-0.64 

0.35 

-2.64 

-2.17 

-3.25 

-1.79 

-1.95 

-3.77 

-0.51 

-2.65 

1840 

1841 

-1.14 

-2.52 

0.97 

0.62 

2.21 

-1.37 

-2.56 

-0.97 

-0.71 

-0.38 

-0.36 

2.37 

1841 

1842 

-0.26 

1.43 

2.05 

0.61 

1.78 

-0.11 

-0.99 

2.73 

0.31 

-0.88 

-1.57 

2.36 

1842 

1843 

1.82 

0.79 

-0.33 

0.46 

-0.96 

-0.25 

-0.67 

1.03 

-0.20 

-1.23 

0.86 

2.99 

1843 

1844 

0.07 

-2.48 

-1.50 

0.74 

1.49 

-1.12 

-2.17 

-1.42 

-0.62 

-0.29 

0.46 

-1.43 

1844 

1845 

1.24 

-4.16 

-4.45 

0.54 

-1.01 

0.20 

0.22, 

-0.86 

-1.26 

-1.04 

1.28 

0.59 

1845 

Means. 

-1.16 

-0.80 

0.55 

4.45 

8.98 

12.45 

13.81 

13.50 

10.86 

7.05 

3.12 

0.68 

Means. 

The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

E  106 


LXXXIX. 

FRANCE.  —  PARIS. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

0 

0 

0 

0 

o 

0 

o 

0 

0 

o 

0 

o 

1806 

3.35 

1.38 

0.28 

-1.54 

2.07 

0.77 

0.64 

-0.38 

0.53 

-0.26 

1.69 

4.00 

1806 

1807 

0.34 

1.39 

-2.74 

-0.63 

1.28 

-0.52 

1.94 

2.34 

-2.08 

1.15 

-0.74 

-1.75 

1807 

1808 

0.42 

-1.42 

-2.19 

-2.23 

2.55 

-0.30 

2.14 

0.66 

-0.78 

-1.74 

0.58 

-1.87 

1808 

1809 

2.95 

2.91 

0.42 

-2.72 

0.54 

-1.38 

-1.08 

-0.36 

-0.81 

-1.09 

-1.54 

1.04 

1809 

1810 

-2.90 

-1.11 

1.16 

-0.42 

-0.62 

-0.06 

-0.74 

-0.70 

1.75 

0.25 

0.80 

1.30 

1810 

1811 

-1.83 

2.31 

1.90 

1.58 

2.14 

0.25 

0.44 

-0.66 

0.95 

2.55 

1.38 

0.72 

1811 

1812 

-0.32 

1.63 

-0.82 

-1.92 

0.88 

-0.77 

-0.96 

-0.46 

-0.17 

0.51 

-1.95 

-3.71 

1812 

1813 

-1.18 

1.33 

-0.23 

0.71 

0.48 

-1.26 

-1.12 

-1.42 

-1.38 

0.29 

-0.63 

-0.47 

1813 

1814 

-1.70 

-3.37 

-2.30 

1.30 

-1.67 

-1.17 

0.46 

-0.91 

-0.26 

-1.22 

-0.51 

2.02 

1814 

1815 

-1.98 

2.39 

2.29 

0.36 

0.18 

-0.89 

-0.93 

-0.54 

-0.11 

0.77 

-2.70 

-1.34 

1815 

1816 

0.54 

-1.69 

-0.71 

0.10 

-1.40 

-1.83 

-2.53 

-2.37 

-1.26 

0.29 

-2.24 

0.07 

1816 

1817 

2.48 

2.22 

-0.20 

-2.02 

-1.70 

0.61 

-1.34 

-1.66 

0.99 

-3.16 

1.80 

-1.12 

1817 

1818 

1.94 

-0.21 

-0.15 

1.20 

-0.65 

1.75 

1.14 

-0.18 

0.05 

0.38 

1.98 

-1.23 

1818 

1819 

2.43 

0.95 

0.16 

1.31 

0.02 

-0.85 

0.30 

0.78 

0.58 

-0.12 

-1.66 

-0.30 

1819 

1820 

-2.02 

-0.98 

-1.42 

1.20 

-0.30 

-1.37 

-0.35 

0.11 

-1.19 

-0.93 

-1.30 

-0.22 

1820 

1821 

1.02 

-2.58 

0.54 

1.34 

-1.95 

-2.05 

-1.39 

1.20 

0.85 

-0.14 

2.70 

3.10 

1821 

1822 

1.96 

1.52 

2.62 

1.01 

1.72 

3.26 

0.09 

0.42 

0.18 

1.72 

1.82 

-3.42 

1822 

1823 

-1.79 

0.88 

-0.14 

-0.62 

0.50 

-1.69 

-1.23 

0.46 

0.00 

-0.58 

-0.84 

1.58 

1823 

1824 

0.61 

0.68 

-1.00 

-0.54 

-1.52 

-0.61 

-0.02 

-0.17 

0.89 

0.54 

2.30 

2.74 

1824 

1825 

1.23 

0.06 

-0.94 

1.54 

-0.22 

-0.05 

1.24 

0.70 

1.77 

0.75 

0.40 

2.18 

1825 

1826 

-2.77 

1.73 

0.56 

0.27 

-1.48 

1.35 

1.59 

2.10 

1.11 

1.70 

-1.08 

1.72 

1826 

1827 

-1.63 

-4.14 

1.14 

1.14 

0.18 

-0.09 

0.85 

-0.43 

0.46 

1.52 

-0.77 

2.58 

1827 

1828 

3.28 

0.80 

0.29 

0.50 

0.46 

0.34 

0.34 

-0.74 

0.74 

-0.30 

0.51 

0.89 

1828 

1829 

-3.16 

-0.97 

-0.75 

-0.08 

0.32 

0.05 

-0.10 

-1.30 

-1.53 

-1.01 

-1.64 

-5.70 

1829 

1830 

-3.42 

-2.59 

2.54 

1.6S 

0.11 

-0.82 

0.16 

-1.23 

-1.50 

-0.44 

0.83 

-0.82 

1830 

1831 

0.13 

1.53 

1.85 

1.30 

-0.20 

-0.12 

0.86 

0.12 

-0.35 

2.83 

-0.10 

1.50 

1831 

1832 

-0.36 

-0.59 

-0.93 

0.65 

-1.05 

0.22 

0.68 

1.87 

-0.10 

0.06 

-0.10 

0.53 

1832 

1833 

-1.73 

2.34 

-1.82 

-0.38 

2.54 

1.06 

-0.24 

-1.65 

-1.53 

0.57 

-0.61 

3.46 

1833 

1834 

4.34 

-0.42 

0.67 

-0.70 

1.59 

0.70 

1.25 

0.69 

1.24 

0.29 

-0.05 

-0.02 

1834 

1835 

1.35 

1.69 

-0.14 

-0.38 

-0.55 

0.18 

1.92 

1.42 

0.36 

-0.92 

-1.10 

-2.84 

1835 

1836 

0.55 

-1.03 

1.62 

-1.02 

-1.67 

1.06 

0.56 

0.30 

-1.24 

-0.04 

0.66 

0.36 

1836 

1837 

0.39 

0.97 

-3.26 

-3.34 

-2.79 

1.14 

-0.32 

1.26 

-0.84 

0.04 

-0.62 

0.60 

1837 

1838 

-5.21 

-5.03 

0.26 

-2.52 

-0.23 

-0.68 

-0.32 

-0.42 

-0.12 

-0.04 

0.74 

-1.48 

1838 

1839 

0.75 

0.73 

-0.62 

-1.70 

-0.71 

1.62 

-0.04 

-0.86 

0.00 

-0.56 

1.10 

1.60 

1839 

1840 

1.23 

-0.47 

-2.58 

2.26 

0.49 

1.02 

-1.08 

0.98 

-0.64 

-1.40 

0.99 

-4.76 

1840 

1841 

0.47 

-1.35 

1.94 

0.42 

2.25 

-1.26 

-1.68 

-0.50 

2.28 

0.12 

0.02 

1.48 

1841 

1842 

-2.65 

0.33 

1.30 

0.26 

0.05, 

2.66 

0.52 

3.18 

-0.12 

-2.28 

-1.10 

0.36 

1842 

1843 

2.07 

-0.39 

1.06 

0.50 

-0.31 

-0.86 

-0.48 

0.70 

0.96 

0.12 

0.54 

0.60 

1843 

1844 

0.83 

-1.31 

0.1S 

2.22 

-1.35 

0.54 

-1.12 

-2.34 

0.24 

-0.36 

0.26 

-3.40 

1844 

Means. 

1.53  3.35 

5.33 

7.90 

11.59 

13.66 

14.96 

14.82 

12.52 

9.00 

5.41 

2.92 

Means. 

E 


The  numbers  without  sign  must  be  subtracted ;  those  with  the  sisn  —  must  be  added. 

107 


xc. 

HOLLAND.  —  ZWANENBURG. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

0 

0 

0 

o 

o 

0 

0 

0 

0 

o 

o 

0 

1743 

0.60 

1.40 

-0.15 

-2.69 

-0.40 

0.59 

-1.15 

0.05 

-0.22 

-2.27 

1.83 

-0.23 

1743 

1744 

-0.91 

-2.36 

-0.74 

-0.80 

-0.89 

-0.26 

-1.02 

-1.23 

-0.71 

0.39 

0.66 

0.21 

1744 

1745 

0.15 

-1.64 

-0.70 

-0.43 

-0.04 

-0.69 

-0.92 

-1.20 

0.02 

-0.27 

-0.50 

-2.16 

1745 

1746 

-0.82 

-1.70 

-2.19 

-1.20 

1.36 

-0.62 

0.04 

-1.28 

-0.65 

-2.09 

-2.80 

1.02 

1746 

1747 

-0.47 

2.16 

-2.29 

-0.18 

-0.52 

0.92 

-0.65 

-0.21 

0.34 

-0.49 

1.62 

1.60 

1747 

1748 

-0.24 

-2.63 

-4.14 

-2.12 

-0.31 

1.45 

O.OS 

0.39 

-0.03 

0.28 

1.68 

3.46 

1748 

1749 

2.68 

0.11 

-1.09 

-0.52 

1.11 

-2.30 

-0.10 

0.23 

-0.11 

-0.35 

-0.45 

1.65 

1749 

1750 

-0.34 

2.60 

2.88 

-0.06 

0.14 

-0.10 

0.97 

-0.45 

0.75 

-1.25 

-1.63 

-0.31 

1750 

1751 

1.09 

-2.29 

1.33 

-0.60 

-1.21 

-0.10 

-0.78 

-0.52 

-1.19 

-0.48 

-1.31 

0.33 

1751 

1752 

1.71 

-0.56 

0.72 

-0.63 

-1.10 

0.95 

-0.48 

-0.09 

0.39 

0.07 

0.90 

J.37 

1752 

1753 

-1.80 

-0.11 

1.34 

0.01 

-0.30 

1.19 

-0.34 

-1.00 

0.30 

0.59 

-0.88 

0.67 

1753 

1754 

0.64 

-1.14 

-2.23 

-1.40 

0.41 

-0.49 

-1.33 

-0.16 

-0.44 

0.61 

0.05 

-0.36 

1754 

1755 

-1.98 

-3.19 

-1.24 

1.72 

-1.37 

1.89 

-0.31 

-1.33 

-1.12 

-0.08 

-0.03 

1.22 

1755 

1756 

3.20 

1.32 

0.38 

-1.57 

-1.53 

0.97 

0.80 

-0.50 

0.74 

-0.31 

-1.13 

-2.60 

1756 

1757 

-2.22 

-0.59 

0.00 

1.00 

-1.01 

-0.11 

2.37 

0.36 

-0.21 

-1.09 

1.43 

-0.09 

1757 

1758 

-1.28 

0.37 

0.41 

-0.39 

1.95 

0.29 

-1.41 

0.99 

-0.17 

0.21 

0.05 

0.36 

1758 

1759 

2.86 

2.13 

1.49 

0.86 

-0.58 

0.99 

1.66 

0.71 

-0.07 

1.05 

-1.54 

-2.68 

1759 

1760 

-1.64 

-0.69 

0.15 

0.77 

-0.22 

1.31 

-0.15 

-0.40 

1.14 

0.28 

1.08 

2.67 

1760 

1761 

1.78 

1.90 

2.37 

0.47 

0.92 

0.86 

-0.61 

1.16 

0.67 

-1.75 

0.34 

-1.59 

1761 

1762 

2.10 

0.09 

-1.25 

2.37 

0.93 

0.67 

0.30 

-1.31 

-0.04 

-1.98 

-1.37 

-2.02 

1762 

1763 

-4,88 

0.79 

-0.34 

-0.24 

-1.04 

0.28 

-0.08 

0.22 

-0.56 

-0.99 

0.56 

1.52 

1763 

1764 

3.37 

2.52 

0.17 

0.52 

1.71 

0.02 

1.43 

-0.32 

-1.14 

-0.74 

-0.45 

-1.01 

1764 

1765 

2.24 

-2.13 

2.30 

1.62 

0.27 

1.22 

-0.84 

0.85 

-0.05 

1.24 

0.08 

-0.82 

1765 

1766 

-0.22 

-0.78 

0.72 

1.67 

0.37 

0.35 

0.20 

0.45 

0.49 

0.32 

0.46 

-0.68 

1766 

1767 

-3.34 

2.34 

1.08 

-0.63 

-1.36 

-0.94 

-0.80 

0.36 

0.98 

0.71 

2.15 

-1.33 

1767 

1768 

-1.94 

0.93 

-0.07 

-0.09 

-0.02 

0.54 

0.65 

0.33 

-1.27 

-0.37 

0.70 

0.72 

1768 

1769 

1.19 

0.09 

0.85 

0.99 

-0.21 

-0.53 

0.53 

-0.06 

0.48 

-1.71 

0.58 

1.43 

1769 

1770 

1.45 

0.92 

-1.12 

-1.04 

-0.15 

-0.34 

0.02 

1.20 

1.59 

0.19 

0.06 

2.01 

1770 

1771 

-0.50 

-1.44 

-2.33 

-2.59 

1.72 

0.26 

-0.29 

-1.01 

0.04 

0.89 

0.69 

1.68 

1771 

1772 

0.11 

0.21 

0.68 

-0.50 

-1.11 

1.19 

0.57 

0.36 

0.83 

2.68 

2.36 

1.16 

1772 

1773 

3.38 

-0.57 

1.36 

0.81 

0.35 

0.31 

-0.16 

1.17 

0.66 

1.79 

1.51 

1.76 

1773 

1774 

0.58 

1.62 

2.18 

1.30 

0.08 

0.96 

1.12 

0.51 

-0.30 

1.23 

-1.84 

-0.45 

1774 

1775 

1.31 

3.40 

2.12 

1.04 

-0.12 

2.19 

0.78 

0.88 

1.84 

1.25 

-1.53 

1.65 

1775 

1776 

-4.40 

1.20 

1.99 

1.45 

-0.85 

1.11 

1.56 

0.47 

-0.01 

1.31 

0.46 

0.05 

1776 

1777 

-0.23 

-1.57 

1.14 

-0.56 

0.15 

-0.19 

-0.07 

0.88 

0.60 

0.73 

1.97 

-0.60 

1777 

1778 

-1.26 

-1.70 

-0.55 

0.36 

0.71 

0.43 

1.43 

0.54 

-1.58 

-2.02 

1.08 

2.90 

1778 

1779 

-0.28 

2.55 

1.79 

1.21 

0.61 

-0.77 

0.60 

1.51 

1.27 

1.61 

0.19 

0.53 

1779 

1780 

-1.54 

-0.56 

2.68 

-0.78 

1.07 

-0.51 

-0.25 

2.04 

1.08 

1.03 

-0.07 

-1.09 

1780 

The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

•  108 


xc. 

HOLLAND.  —  ZWANENBURG  (continued). 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur.  .  , 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

1781 

0 

-0.97 

0 

1.18 

0 

1.18 

0 

1.23 

0 

0.37 

0 

2.47 

o 
1.04 

o 
1.56 

0 

0.91 

o 
0.75 

0.36 

0 

-0.39 

1781 

1782 

2.88 

-1.88 

-0.56 

-1.11 

-1.09 

0.77 

0.34 

-0.54 

0.50 

-0.93 

-2.43  -0.89 

1782 

1783 

2.39 

2.13 

-1.31 

1.24 

-0.05 

0.92 

2.75 

0.93 

0.44 

0.73 

0.48  -2.74 

1783 

1784 

-3.26 

-3.01 

-2.04 

-2.16 

1.23 

0.15 

-0.37 

-0.80 

0.94 

-2.30 

0.80  -1.60 

1784 

1783 

-0.06 

-2.34 

-3.32 

-1.54 

-0.96 

-0.46 

-0.01 

-0.59 

1.14 

0.40 

0.41 

-1.70 

1785 

1786 

0.35 

-0.08 

-3.19 

0.44 

-0.59 

0.72 

-1.80 

-0.75 

-1.55 

-1.49 

-3.59 

-0.23 

1786 

1787 

-0.23 

1.24 

1.82 

-0.90 

-1.11 

-0.11 

-0.82 

-0.56 

1787 

1788 

2.20 

-0.42 

-1.15 

0.24 

0.58 

1.05 

0.87 

-0.66 

0.30 

0.33 

-0.73 

-6.23 

1788 

1789 

-2.66 

0.98 

-3.65 

-1.64 

0.56 

-0.65 

-0.58 

-0.07 

-0.40 

-1.13 

-1.10 

1.84 

1789 

1790 

2.20 

2.51 

1.53 

-2.00 

0.89 

-0.72 

-1.76 

-1.25 

-1.73 

-0.86 

-1.71 

0.89 

1790 

1791 

2.74 

1.29 

1.23 

1.34 

-1.21 

-1.25 

-1.20 

-0.14 

-0.74 

-0.60 

-0.79 

-0.58 

1791 

1792 

1.06 

-0.38 

0.03 

1.70 

-1.11 

-0.93 

-0.07 

0.27 

-1.53 

-1.13 

-0.14 

1.05 

1792 

1793 

0.52 

1.59 

0.03 

-1.40 

-1.61 

-1.70 

0.67 

-0.65 

-1.68 

0.98 

-0.17 

1.60 

1793 

1794 

-0.21 

2.09 

2.58 

2.59 

-0.76 

-0.43 

1.52 

-0.87 

-1.14 

-0.54 

0.41 

-2.08 

1794 

1795 

-4.52 

-1.53 

-0.92 

0.85 

-1.88 

-0.18 

-2.29 

-0.08 

1.51 

2.39 

0.37 

2.87 

1795 

1796 

4.72 

1.76 

-0.99 

1.00 

-0.63 

-0.50 

-0.91 

0.02 

0.64 

-0.80 

-0.46 

-2.07 

1796 

1797 

0.84 

0.52 

-0.18 

0.81 

0.52 

-1.18 

1.38 

0.01 

-0.78 

-0.60 

0.32 

1.59 

1797 

1798 

1.45 

1.73 

0.31 

1.22 

0.11 

0.77 

-0.05 

0.36 

0.19 

0.68 

-0.17 

-3.49 

1798 

1799 

-2.11 

-2.00 

-1.77 

-2.19 

-1.68 

-1.83 

-1.47 

-1.08 

-0.72 

-0.63 

0.59 

-3.54 

1799 

1800 

-0.65 

-1.76 

-1.97 

2.08 

1.85 

-2.10 

-1.32 

0.04 

0.50 

0.02 

1.12 

-0.46 

1800 

1801 

1.97 

-0.59 

1.61 

0.26 

0.68 

-1.43 

-0.76 

0.32 

0.45 

1.16 

0.53 

0.47 

1801 

1802 

-0.75 

0.24 

0.56 

0.55 

-1.10 

-0.28 

-1.69 

1.08 

0.03 

1.15 

0.54 

1.19 

1802 

1803 

-3.04 

-2.29 

0.00 

2.06 

-1.55 

-0.92 

1.43 

0.75 

-1.11 

0.06 

0.29 

0.43 

1803 

1804 

3.30 

0.13 

-0.92 

-0.84 

1.35 

0.26 

0.03 

-0.20 

1.57 

0.62 

-1.79 

-2.84 

1804 

1805 

-1.22 

-0.36 

-0.07 

-0.56 

-2.16 

-1.97 

-1.18 

0.05 

1.47 

-2.00 

-1.69 

0.94 

1805 

1806 

3.14 

1.58 

0.25 

-1.95 

1.79 

-0.52 

0.13 

0.67 

1.41 

0.23 

2.52 

4.12 

1806 

1807 

2.36 

1.74 

-1.32 

-0.37 

1.09 

-0.17 

1.64 

2.53 

-1.40 

1.63 

-0.15 

0.84 

1807 

1808 

1.19 

0.07 

-1.71 

-2.02 

2.07 

-0.46 

2.62 

1.64 

0.24 

-1.35 

-0.05 

-1.50 

1808 

1809 

.  . 

.  . 

.  . 

-2.53 

1.30 

-1.03 

-0.47 

0.09 

-0.27 

-1.32 

-0.99 

0.68 

1809 

1810 

-1.94 

-1.39 

-0.36 

-0.41 

-1.76 

-0.96 

0.05 

-0.07 

0.99 

-0.63 

-0.03 

1.06 

1810 

1811 

-2.75 

0.55 

1.41 

1.16 

2.75 

1.53 

0.47 

-0.30 

-0.49 

2.40 

1.80 

1.05 

1811 

1812 

0.81 

1.20 

-1.21 

-2.48 

0.16 

-0.68 

-1.28 

-0.56 

-0.62 

0.46 

-2.11 

-4.00 

1812 

1813 

-0.84 

1.53 

0.16 

0.04 

Q.85 

-0.32 

-0.12 

-0.91 

-0.75 

-1.32 

-0.76 

-1.31 

1813 

1814 

-3.33 

-4.20 

-2.89 

1.27 

-2.01 

-1.86 

0.44 

-0.66 

-0.72 

-1.44 

-0.17 

0.17 

1814 

1815 

-2.69 

0.96 

2.23 

0.59 

0.59 

-O.OS 

-1.63 

-0.77 

-0.54 

0.07 

-0.97 

-1.90 

1815 

1816 

0.52 

-1.64 

-0.78 

-0.28 

-1.48 

-2.28 

-1.31 

-1.85 

-1.14 

-0.12 

-2.06 

-0.45 

1816 

1817 

2.36 

2.31 

0.19 

-2.12 

-1.38 

0.84 

-0.83 

-1.30 

0.69 

-3.16 

1.83 

-0.67 

1817 

1818 

1.96 

-0.40 

0.40 

-0.21 

-0.56 

1.69 

0.99 

-0.64 

-0.36 

-0.34 

0.74 

-1.22 

1818 

The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

E  109 


xc. 

HOLLAND.  —  ZWANENBURG-  (continued). 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

.  Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

0 

0 

o 

o 

o 

o 

0 

0 

o 

o 

0 

0 

1819 

1.47 

1.04 

0.68 

0.84 

0.91 

0.50 

0.56 

1.12 

0.55 

-0.79 

-1.18 

-2.18 

1819 

1820 

-2.89 

-1.49 

-1.21 

0.72 

0.12 

-1.71 

-1.06 

-0.11 

-0.93 

-0.81 

-1.84 

-1.59 

1820 

1821 

-0.67 

-1.32 

-0.16 

1.66 

-1.24 

-1.91 

-1.81 

-0.14 

0.72 

0.20 

1.72 

2.08 

1821 

1822 

2.64 

1.93 

2.26 

0.40 

1.53 

1.65 

0.24 

-0.19 

-0.88 

0.74 

1.99 

-2.95' 

1822 

1823 

-6.29 

-0.94 

0.11 

-1.19 

0.44 

-1.88 

-0.89 

0.12 

-0.37 

-0.66 

0.90 

1.65 

1823 

1824 

2.30 

0.20 

-0.22 

-0.78 

-0.47 

-0.40 

-0.19 

0.00 

1.03 

0.36 

1.52 

2.59 

1824 

1825 

2.63 

0.60 

-1.42 

0.43 

0.12 

0.00 

-0.04 

-0.36 

1.20 

1.04 

1.03 

1.70 

1S25 

1826 

-2.57 

0.97 

0.87 

0.17 

-0.59 

1.52 

2.12 

2.01 

0.30 

1.95 

0.16 

1.99 

1826 

1827 

-0.65 

-3.83 

0.58 

0.93 

0.40 

-0.24 

0.14 

-0.55 

-0.14 

0.88 

-0.91 

2.79 

1827 

1828 

0.75 

-0.75 

1.05 

0.43 

0.49 

0.70 

0.79 

-0.64 

0.43 

0.24 

-0.18 

1.96 

1828 

1829 

-3.35 

-2.47 

-1.43 

-0.45 

0.10 

-0.37 

-0.42 

-1.35 

-1.52 

-0.43 

-1.61 

-5.77 

1829 

1830 

-2.70 

-4.01 

0.50 

0.75 

0.13 

-1.45 

0.59 

-1.17 

-1.45 

0.34 

1.00 

-1.80 

1830 

1831 

-1.07 

0.04 

1.24 

1.61 

-0.10 

-0.09 

0.90 

0.66 

-0.14 

3.16 

0.66 

1.72 

1831 

1832 

-0.77 

-1.34 

-0.43 

0.55 

-1.49 

-0.07 

-1.74 

-0.12 

-0.64 

0.48 

-1.37 

0.72 

1832 

1833 

-2.12 

1.33 

-1.62 

-0.68 

2.22 

0.92 

-0.48 

-2.08 

-0.99 

0.11 

0.44 

3.07 

1833 

1834 

4.21 

0.40 

1.15 

-0.87 

1.31 

0.87 

1.80 

1.00 

0.86 

0.68 

-0.31 

1.42 

1834 

1835 

1.21 

1.81 

0.47 

-0.76 

-1.09 

0.92 

0.47 

0.07 

-0.22 

-0.77 

-1.44 

-0.44 

1835 

Means. 

0.99 

3.14 

3.86 

6.80 

10.12 

12.45 

13.97 

14.13 

12.30 

8.61 

4.84 

2.16 

Means. 

XCI.  ENGLAND.  —  LONDON. 

Degrees  of  Reaumur. 

1794 

-0.96 

2.72 

1.23 

1.64 

-0.99 

-0.43 

1.83 

-0.38 

-1.35 

-0.61 

0.36 

-1.10 

1794 

1795 

-5.04 

-2.08 

-1.26 

-0.23 

-0.46 

-1.98 

-0.04 

0.11 

1.76 

1.61 

-0.88 

2.46 

1795 

1796 

4.42 

0.50 

-1.00 

1.10 

-1.26 

-1.00 

-1.28 

-0.51 

1.23 

-1.45 

-0.97 

-3.76 

1796 

1797 

-0.01 

-1.44 

-1.51 

-0.45 

-0.70 

-1.56 

0.62 

-0.82 

-0.97 

-1.34 

-0.44 

0.93 

1797 

1798 

-3.44 

-0.28 

-0.12 

1.41 

0.44 

1.31 

-0.10 

0.88 

-0.11 

0.09 

-1.24 

-2.39 

1798 

1799 

-1.00 

-1.05 

-1.74 

-1.94 

-1.39 

-1.34 

-0.79 

-1.40 

-1.19 

-1.02 

0.13 

-2.79 

1799 

1800 

0.59 

-2.04 

-1.70 

1.14 

0.66 

-1.37 

0.66 

1.23 

0.42 

-0.86 

-0.15 

-0.24 

1800 

1801 

1.64 

-0.08 

1.26 

-0.35 

-0.10 

-0.09 

-0.48 

0.76 

0.88 

0.33 

-1.08 

^1.37 

1801 

1802 

-1.21 

0.11 

-0.04 

1.14 

-1.50 

-0.66 

-2.20 

1.74 

0.49 

0.23 

-0.89 

-0.56 

1802 

1803 

-0.92 

-1.03 

0.51 

0.88 

-1.12 

-0.89 

0.97 

0.41 

-1.77 

-0.40 

-0.31 

0.98 

1803 

1804 

3.39 

-0.73 

0.00 

-0.95 

1.80 

1.07 

-0.57 

-0.20 

1.16 

0.66 

0.68 

-1.52 

1S04 

1805 

-0.52 

0.04 

0.34 

-0.20 

-1.38 

-1.49 

-0.89 

0.60 

1.15 

-1.06 

-1.17 

0.08 

1S05 

1806 

2.27 

1.27 

-0.23 

-1.21 

1.00 

0.64 

-0.06 

0.38 

0.16 

0.54 

2.11 

3.64 

1806 

1807 

0.64 

0.54 

-1.80 

-0.14 

1.05 

-0.34 

1.07 

1.36 

-1.61 

1.44 

-1.60 

-1.19 

1807 

1808 

0.64 

-1.01 

-1.80 

-1.43 

1.99 

0.02 

1.87 

0.82 

^0.55 

-1.76 

0.58 

-1.32 

1808 

1809 

-0.11 

2.36 

0.65 

-2.05 

1.23 

-0.38 

-0.75 

-1.09 

-0.24 

-0.08 

-1.33 

0.72 

1809 

E 


The  numbers  without  sign  must  be  subtracter! ;  those  with  the  sign  —  must  be  added 

110 


XCI. 

ENGLAND.  —  LONDON  (continued). 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

N  jv.   Dec. 

Year. 

o 

0 

o 

0 

0 

o 

o 

0 

o 

0 

o 

0 

1810 

-0.47 

0.01 

0.3S  0.12 

-1.44 

0.20 

-0.44 

-0.16 

1.32 

0.95 

0.32  -0.03 

1810 

1811 

-1.09 

0.85 

1.54  1.64 

2.03 

0.51 

0.36  -0.51 

0.83 

2.50 

1.29  -0.16 

1811 

1812 

0.42 

1.43 

-0.68 

-1.56 

-0.19 

-1.09 

-1.24 

-1.89 

-0.64 

-1.10 

-0.75  0.90 

1812 

1813 

-0.51 

1.34 

0.87 

-0.81 

0.12 

-0.96 

-0.97 

-1.00 

-0.99 

-1.05 

-0.84.  -1.01 

1813 

1814 

-3.80 

-2.21 

—2.55 

1.06 

-1.66 

-2.03 

-0.04 

-0.91 

-0.72 

-1.10 

-0.75 

0.90 

1814 

1815 

-1.49 

1.34 

1.94 

0.44 

1.19 

0.24 

-0.53 

-0.07 

2.48 

0.55 

-1.42 

-0.83 

1815 

1816 

0.64 

-0.70 

-0.64 

-0.50 

-0.99 

-1.27 

-2.35 

-1.18 

0.96 

0.28 

-1.24 

-0.48 

1816 

1817 

1.84 

2.05 

0.25 

-0.63 

-1.75 

0.77 

-1.46 

-2.60 

-0.81 

-1.76 

2.14-0.70 

1817 

1818 

1.67 

-1.32 

0.08 

0.04 

-0.06 

2.24 

2.40 

1.98 

2.30 

2.06 

3.20-0.08 

1818 

1819 

2.29 

0.85 

1.36 

1.37 

0.88 

-0.69 

0.36 

1.58 

0.70 

3.08 

-0.75 

-0.74 

1819 

1820 

-1.44 

-0.66 

0.25 

1.68 

-0.01 

-0.74 

-0.71 

-1.18 

-0.99 

-0.96 

-0.22 

0.59 

1820 

1821 

1.04 

-0.97 

0.87 

2.08 

-1.26 

-1.80 

-1.55 

0.47 

1.28 

0.32 

2.32 

2.32 

1821 

1822 

2.16 

2.19 

2.78 

0.48 

1.45 

1.57 

0.36 

0.29 

-0.24 

1.04 

2.36 

-1.14 

1822 

1823 

-1.40 

,  0.19 

0.16 

-0.10 

2.16 

0.33 

0.14 

0.78 

0.39 

-0.56 

0.54 

0.55 

1823 

1824 

0.78 

2.41 

-0.73 

-0.94 

-1.48 

-r.40 

0.00 

-0.29 

0.48 

-0.03 

1.38 

1.08 

1824 

1825 

1.31 

-0.21 

-1.17 

1.28 

0.08 

-0.03 

1.47 

0.38 

1.63 

0.32 

-0.84 

0.59 

1825 

1826 

-1.49 

1.61 

.  . 

1.46 

1.16 

1.97 

1.69 

1.67 

0.30 

1.28 

-1.11 

1.19 

1826 

1827 

-0.96 

-3.19 

0.74 

0.39 

-0.08 

-0.40 

0.74 

-0.73 

0.21 

0.84 

-0.28 

1.99 

1827 

1828 

1.73 

0.54 

1.00 

0.28 

0.70 

0.88 

0.36 

-0.62 

0.52 

-0.16 

0.65 

2.37 

1828 

1829 

-1.76 

-0.24 

-1.08 

-0.85 

0.50 

0.35 

-0.48 

-1.22 

-1.41 

-1.16 

-1.60 

-3.14 

1829 

1830 

-2.31 

-2.17 

1.98 

1.15 

-1.39 

-1.09 

0.65 

-1.09 

-1.37 

0.32 

0.63 

-2.12 

1830 

1831 

-0.73 

1.01 

1.16 

1.21 

-0.21 

0.55 

1.49 

1.29 

-0.04 

2.39 

-0.08 

1.21 

1831 

1832 

0.13 

-0.86 

-0.42 

0.35 

-0.70 

0.57 

-0.20 

0.18 

-0.06 

0.52 

0.47 

1.08 

1832 

1833 

-0.64 

1.45 

-1.68 

-0.10 

2.72 

0.66 

-0.13 

-1.31 

-1.41 

0.24 

0.16 

2.21 

1833 

1834 

3.73 

0.48 

1.16 

-0.48 

1.59 

1.20 

1.29 

0.76 

0.70 

0.10 

0.45 

0.35 

1834 

1835 

0.82 

0.81 

-0.22 

0.30 

-0.12 

0.71 

0.87 

1.09 

0.21 

-0.90 

0.05 

-1.76 

1835 

1836 

0.80 

-0.99 

0.94 

-1.12 

-1.28 

0.48 

0.18 

-1.11 

-1.50 

-1.14 

-0.55 

0.28 

1836 

1837 

0.73 

0.74 

-2.22 

-2.79 

-2.01 

0.04 

0.05 

-0.16 

-0.75 

0.21 

-0.57 

1.17 

'1837 

1838 

-2.93 

-2.57 

0.18 

-1.50 

-0.88 

0.02 

-0.31 

-0.42 

-0.92 

0.10 

-0.68 

-0.03 

1838 

1839 

0.73 

0.14 

-1.08 

-2.48 

-1.24 

0.66 

-0.35 

-0.73 

-1.06 

-0.52 

0.67 

-0.21 

1839 

1840 

1.27 

-0.50 

-1.97 

-0.01 

0.14 

1.02 

-0.77 

0.73 

-1.10 

-1.32 

0.60 

-2.41 

1840 

1841 

-0.38 

-1.41 

2.58 

0.61 

2.08 

2.17 

-1.02 

-0.02 

0.16 

-0.01 

0.40 

1.06 

1841 

1842 

-L02 

0.81 

1.47 

-0.43 

0.59 

2.84 

0.18 

2.11 

0.19 

-1.70 

0.36 

2.50 

1842 

Means. 

2.38 

3.81 

5.00 

7.30 

10.46 

12.92 

14.26 

14.07 

12.06 

8.88 

5.51 

3.81 

Means. 

E 


The  numbers  without  sim  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

Ill 


XCII. 

SCOTLAND.  —  KINFAUNS  CASTLE. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Y«ar. 

o 

o 

0 

o 

0 

0 

c 

o 

o 

o 

o 

o 

1814 

-4.71 

-1.63 

-1.73 

0.56 

-2.46 

-2.36 

-0.60 

-1.12 

-0.34 

-1.16 

-1.61 

-1.46 

1814 

1815 

-1.69 

1.13 

0.16 

-0.03 

0.95 

0.24 

-0.12 

0.23 

0.27 

0.74 

-1.68 

-2.47 

1815 

1816 

-0.24 

-1.60 

-1.49 

-1.58 

-0.74 

-0.60 

-0.96 

-0.53 

-0.99 

-0.24 

-1.12 

-1.84 

1816 

1817 

1.60 

1.29 

-0.44 

0.33 

-1.12 

0.80 

-0.43 

-1.11 

0.18 

-2.22 

1.78 

-1.38 

1817 

1818 

0.51 

-1.03 

-1.41 

-1.59 

1.03 

1.43 

0.85 

-0.22 

-0.15 

2.34 

2.54 

0.25 

1818 

1819 

0.85 

-0.88 

0.67 

-0.20 

-0.36 

-0.85 

0.07 

2.00 

0.30 

-0.32 

-2.35 

-2.60 

1819 

1820 

-2.43 

0.95 

0.33 

1.10 

0.20 

-0.12 

0.39 

-0.26 

-0.36 

-1.20 

0.15 

0.36 

1820 

1821 

0.55 

0.97 

0.26 

1.12 

-1.09 

-0.45 

-0.01 

0.84 

1.44 

0.83 

0.38 

0.73 

1821 

1822 

1.85 

1.28 

1.08 

0.79 

0.97 

2.04 

0.50 

0.26 

-0.81 

0.48 

1.38 

-0.61 

1822 

1823 

-0.91 

-1.69 

-0.16 

-0.60 

0.63 

-1.01 

-0.92 

-0.85 

-0.15 

-0.56 

2.02 

-0.04 

1823 

1824 

2.64 

1.20 

-0.56 

0.39 

0.18 

0.26 

0.43 

0.03 

0.24 

-2.16 

-0.16 

0.35 

1824 

1825 

1.94 

0.84 

0.45 

0.82 

-0.09 

0.31 

1.59 

1.53 

1.85 

1.79 

-0.32 

0.80 

1825 

1827 

0.68 

-0.77 

0.02 

0.73 

0.51 

0.38 

0.16 

0.37 

1.48 

2.48 

-0.99 

2.23 

1827 

1828 

2.50 

1.44 

1.63 

0.69 

1.20 

1.23 

0.93 

1.03 

1.23 

1.10 

2.05 

2.73 

1828 

1829 

-0.38 

0.96 

0.42 

-0.48 

0.87 

1.00 

-0.12 

-0.44 

-1.02 

0.34 

-0.19 

0.02 

1829 

1830 

0.40 

-0.22 

2.07 

0.87 

0.60 

-0.63 

O.£0 

-1.13 

0.11 

1.33 

0.92 

-0.89 

1830 

1832 

1.91 

1.27 

0.92 

1.22 

-0.19 

0.50 

0.24 

0.93 

1.35 

1.53 

-0.56 

0.40 

1832 

1833 

-1.40 

0.51 

-0.41 

0.32 

2.79 

0.59 

0.67 

-0.98 

-0.24 

0.53 

0.12 

0.57 

1833 

1834 

2.23 

0.97 

1.05 

0.51 

1.01 

0.53 

0.93 

0.34 

0.28 

0.49 

0.14 

0.57 

1834 

1835 

-0.27 

0.72 

-0.08 

0.23 

-0.58 

0.20 

-0.17 

1.09 

-0.10 

-1.10 

-0.31 

-0.34 

1835 

1836 

0.59 

-0.67 

-0.70 

-0.81 

0.10 

-0.54 

-1.16 

-1.09 

-1.67 

-0.86 

-0.94 

-0.05 

1836 

1837 

-0.07 

0.20 

-2.26 

-2.35 

-1.70 

-0.05 

0.52 

-1.13 

-1.32 

0.23 

-1.18 

1.74 

1837 

1838 

-2.58 

-4.61 

-0.83 

-1.44 

-1.75 

-1.03 

-0.04 

-0.24 

-0.53 

-0.55 

2.73 

0.48 

1838 

1839 

-0.90 

-0.79 

-1.56 

-1.24 

-1.18 

-0.45 

-0.34 

-0.79 

-0.64 

-0.17 

0.11 

-0.35 

1839 

1840 

0.65 

-0.26 

-0.07 

1.00 

-0.72 

-0.40 

-1.30 

0.21 

-1.29 

-0.63 

-0.17 

-0.58 

1840 

1841 

-2.19 

-0.09 

2.25 

-0.28 

0.51 

-1.07 

-0.83 

-0.20 

0.51 

-1.52 

-1.94 

-0.49 

1841 

1842 

-1.17 

0.49 

0.35 

-0.07 

0.48 

0.02 

-0.83 

1.24 

0.32 

-1.52 

-0.81 

1.81 

1842 

Means. 

1.77 

2.74 

3.87 

5.71 

8.13 

10.58 

11.76 

11.28 

9.52 

6.72 

4.35 

2.96 

Means. 

XCIII.  FINLAND.  —  TORNEA. 

1801 
1802 

-001 

-1.67 
-4.06 

1801 
1802 

-0.57 

-0.17 

-0.15 

0.10 

-2.88 

-0.66 

-2.03 

-1.60 

-1.60 

1.30 

-2.10 

1803 

-3.50 

-0.90 

-0.13 

1.57 

1.69 

-0.44 

-0.58 

0.93 

-0.90 

1.18 

0.71 

-3.67 

1803 

1804 

-2.50 

-4.82 

-2.34 

1.99 

1.50 

-0.97 

0.78 

-0.70 

-0.21 

1.19 

1.46 

-4.01 

1804 

1805 

3.36 

-2.94 

-1.15 

-0.79 

-1.56 

-2.90 

-1.03 

0.62 

-1.34 

-4.62 

-2.83 

-2.98 

1805 

1806 

2.91 

1.91 

-0.03 

2.02 

1.00 

-1.18 

-1.90 

2.00 

1.20 

0.13 

-0.97 

0.74 

1806 

1807 

-3.40 

1.94 

-1.25 

-2.57 

-1.93 

-0.61 

0.34 

0.89 

-1.41 

-2.30 

-0.20 

-0.92 

1807 

1808 

1.80 

-1.50 

0.19 

-2.31 

1.14 

2.65 

0.58 

-0.11 

•-0.51 

3.53 

2.24 

-3.74 

1808 

1809 

-7.19 

-3.99 

-2.74 

-3.78 

-1.91 

0.62 

-0.50 

1.16 

-0.34 

-0.25 

-1.67 

8.07 

1809 

1810 

-2.18 

-2.36 

-2.41 

-2.45 

-6.45 

-0.68 

-2.13 

-0.68 

-1.34 

-1.23 

-4.13 

-2.20 

1810 

1811 

2.98 

-2.74 

3.64 

-2.04 

-0.69 

0.42 

-0.91 

-2.66 

-1.05 

-1.90 

-0.10 

-2.06 

1811 

1812 

1.18 

1.85 

-3.37 

-1.39 

0.55 

-2.94 

-2.53 

-1.20 

-2.85 

-0.78 

-4.18 

-1.15 

1812 

1813 

1.32 

1.15 

1.70 

1.88 

-0.71 

-1.58 

1.87 

0.08 

1.88 

-2.89 

3.65 

-1.43 

1813 

The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

E  112 


XC1II. 

FINLAND.  — .TORNEA  (continued). 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

Ap-il. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nor. 

f  Dec. 

Year. 

0 

o 

0 

o 

0 

o 

o 

o 

0 

c 

o 

o 

1814 

-7.01 

2.71 

-1.85 

0.92 

-0.59 

2.44 

4.65 

4.46 

2.60 

0.44 

-0.15 

-4.50 

1814 

1815 

1.22 

3.16 

0.66 

5.27 

3.22 

5.58 

4.70 

5.03 

4.02 

3.38 

4.30 

4.82 

1815 

1816 

2.27 

-8.23 

-4.25 

0.50 

-3.05 

-0.12 

0.18 

-0.41 

1.97 

0.16 

1.17 

2.29 

1816 

1817 

3.54 

-2.13 

-2.78 

0.19 

2.42 

-1.14 

0.65 

-1.34 

-0.36 

-1.14 

-0.07 

-2.85 

1817 

1818 

3.46 

-3.34 

-1.07 

-2.61 

-3.48 

-0.92 

2.98 

-2.55 

0.09 

1.08 

2.89 

5.83 

1818 

1819 

4.47 

-0.15 

-0.50 

-2.07 

0.23 

1.46 

2.90 

2.22 

1.04 

-4.58 

-3.62 

-2.15 

1819 

1820 

-5.74 

-0.22 

-0.63 

-1.32 

-0.73 

1.62 

0.13 

-0.17 

0.18 

-2.17 

-1.94 

-2.67 

1820 

1821 

-2.18 

1.12 

0.50 

0.83 

1.24 

-3.70 

-2.44 

-1.32 

-0.58 

3.58 

-1.52 

-4.13 

1821 

1822 

0.13 

6.44 

5.68 

4.22 

1.67 

-1.39 

-0.89 

1.75 

-0.14 

0.47 

-2.05 

4.46 

1822 

1823 

-4.01 

-1.08 

4.13 

0.66 

0.87 

-0.43 

.-0.09 

-0.73 

-0.86 

2.06 

-1.38 

1.26 

1823 

1824 

0.71 

4.20 

1.75 

-0.22 

-0.40 

0.29 

-0.89 

-0.73 

1.25 

-2.18 

-1.01 

-0.96 

1824 

1825 

3.99 

1.42 

1.83 

1.78 

-0.29 

-0.43 

-1.53 

-0.17 

6.34 

2.14 

2.35 

3.20 

1825 

1826 

1.99 

4.70 

4.99 

0.50 

2.65 

1.56 

2.28 

1.70 

-0.70 

2.67 

3.23 

3.74 

1826 

1827 

0.03 

0.00 

0.59 

-2.13 

2.39 

1.79 

-2.00 

-1.64 

1.21 

-1.53 

-0.56 

5.68 

1827 

1828 

-0.50 

-0.84 

-1.77 

-0.66 

2.84 

0.18 

-1.73 

-0.73 

-2.86 

1.18 

0.50 

1.69 

1828 

1829 

1.26 

-4.27 

-2.69 

-2.53 

1.26 

-£.31 

0.30 

-1.82 

0.38 

-1.78 

-0.53 

2.86 

1829 

1830 

0.99 

0.80 

2.08 

-0.54 

-1.10 

-0.66 

-0.89 

-1.73 

-0.88 

-0.03 

3.44 

-1.22 

1830 

1831 

-3.98 

-0.07 

-2.31 

2.01 

0.98 

1.98 

0.81 

0.79 

-0.54 

0.01 

2.99 

1.69 

1831 

1832 

5.26 

8.25 

3.64 

2.92 

0.10 

0.51 

-1.11 

-1.22 

-3.67 

2.86 

1832 

Means.  -12.5.3-10.76 

-7.19 

-1.62 

4.01 

10.59 

13.05 

10.81 

6.22 

0.26 

-6.27 

-10.32 

Means. 

XCIV.  NORTH  AMERICA.  —  ALBANY,  N.  Y. 

Degrees  of  Reaumur. 

1826 

1.92 

2.44 

1.65 

-1.02 

3.23 

1.07 

0.72 

1.09 

1.57 

1.46 

0.81 

0.35 

1826 

1827 

-2.91 

1.07 

1.15 

1.62 

-0.02 

0.05 

0.55 

0.08 

0.43 

1.14 

-1.72 

0.77 

1827 

1828 

2.80 

4.52 

2.10 

-0.88 

0.76 

2.66 

-0.41 

1.33 

0.35 

-0.31 

0.76 

3.17 

1828 

1829 

-0.21 

-2.27 

-0.87 

0.12 

2.09 

0.03 

-1.54 

-0.42 

-1.93 

0.92 

0.50 

3.63 

1829 

1830 

0.28 

-0.11 

1.41 

3.64 

-0.21 

-0.92 

0.81 

0.27 

0.19 

1.42 

3.83 

4.71 

1830 

1831 

-1.30 

-1.03 

2.77 

1.89 

1.07 

2.11 

0.32 

1.01 

1.00 

1.52 

0.63 

-4.94 

1831 

1832 

0.18 

-0.87 

0.16 

-1.29 

-1.35 

0.19 

-0.34 

-0.31 

0.53 

0.67 

1.15 

0.76 

1832 

1833 

2.34 

-1.34 

-1.15 

1.75 

1.55 

-2.35 

-1.06 

-1.47 

-0.55 

-0.55 

-0.61 

0.18 

1833 

1834 

-1.18 

3.73 

0.67 

0.68 

-0.05 

-1.12 

1.59 

-0.03 

0.27 

-1.31 

-0.36 

-1.13 

1834 

1835 

-1.06 

-1.50 

-0.98 

-1.59 

-0.57 

-0.34 

-0.43 

-0.90 

-2.14 

1.45 

0.31 

-3.06 

1835 

1836 

-0.35 

-3.89 

-3.48 

-2.27 

-0.95 

-1.30 

0.20 

-2.39 

-0.39 

-3.06 

-0.62 

-0.92 

1836 

1837 

-3.40 

-0.72 

-1.94 

-2.02 

-1.23 

0.07 

-0.95 

-0.98 

-0.60 

-0.89 

0.33 

-0.49 

1837 

1838 

3.34 

-4.01 

0.97 

-3.07 

-1.26 

1.78 

0.31 

0.27 

0.36 

-0.68 

-1.47 

-2.11 

1838 

1839 

-0.25 

1.62 

0.14 

0.79 

-0.79 

-1.79 

0.15 

-0.14 

0.41 

0.99 

-0.94 

-0.19 

1839 

1840 

-3.32 

3.14 

0.60 

1.32 

0.96 

-0.14 

0.94 

0.81 

-0.91 

0.28 

0.28 

-1.26 

1840 

1841 

1.95 

-0.72 

-1.19 

-2.58 

-1.13 

1.90 

0. 

1.23 

0.88 

-1.72 

-0.49 

0.86 

1841 

1842 

2.03 

3.15 

2.06 

0.62 

-1.96 

-0.9S 

0.28 

0.13 

-1.09 

-0.12 

-1.00 

-1.69 

1842 

1843 

2.65 

-3.06 

-4.26 

-0.62 

-0.62 

-0.64 

-0.55 

0.64 

0.85 

-1.24 

-1.11 

0.93 

1843 

1844 

-3.74 

-0.15 

0.27 

2.97 

0.47 

-0.29 

-0.60 

-0.19 

0.72 

0.02 

-0.20 

0.47 

1844 

Means. 

-3.58 

-3.08 

1.28 

7.04 

12.33 

16.02 

17.80 

16.86 

13.06 

7.64 

2.70 

-1.65 

Means. 

E 


The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

113 


xcv. 

NORTH  AMERICA.  —  SALEM,  MASS. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan.  4 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Get. 

Nov. 

Dec. 

Year. 

o 

o 

0 

o 

o 

o 

o 

o 

o 

0 

o 

o 

1767 

0.40 

-1.37 

0.24 

-0.24 

-0.61 

-0.84 

-1.53 

-0.28 

-1.13 

-1.00 

0.58 

0.07 

1787 

1788 

-1.38 

-2.15 

-0.32 

-0.47 

-0.28 

-1.39 

0.14 

-0.17 

0.87 

-1.00 

2.03 

-1.60 

1788 

1789 

0.17 

-2.81 

-0.65 

-0.47 

-1.94 

0.61 

-0.31 

0.05 

-0.47 

-2.56 

0.47 

1.18 

1789 

1790 

1.17 

-1.04 

-1.32 

-1.47 

-0.50 

-0.50 

-0.75 

-1.50 

-1.02 

-0.56 

-0.97 

-2.82 

1790 

1791 

0.17 

-1.48 

0.90 

0.64 

1.50 

1.16 

-0.08 

0.16 

-0.69 

-2.23 

-0.42 

0.07 

1791 

1792 

-2.94 

-0.37 

1.79 

0.87 

1.61 

-0.84 

-0.64 

-0.28 

-1.80 

0.77 

0.92 

-1.15 

1792 

1793 

1.03 

0.70 

1.42 

1.51 

2.55 

2.07 

0.59 

0.75 

0<37 

-0.09 

0.07 

-0.10 

1793 

1794 

0.95 

-0.25 

1.91 

1.19 

1.16 

0.11 

0.52 

0.58 

0.75 

-1.26 

-0.16 

4.35 

1794 

1795 

0.20 

-0.50 

0.54 

0.21 

0.39 

0.12 

-0.31 

1.85 

1.04 

1.24 

0.36 

1.51 

1795 

1796 

1.18 

0.12 

-0.37 

1.17 

-0.11 

0.40 

0.39 

0.80 

-0.06 

-0.55 

-1.26 

-3.02 

1796 

1797 

-1.15 

2.24 

0.55 

-0.26 

-1.25 

0.41 

1.40 

-0.45 

-0.64 

-0.83 

-1.72 

-2.52 

1797 

1798 

0.68 

-0.89 

0.54 

0.76 

1.44 

0.60 

0.46 

2.29 

0.83 

0.81 

-1.57 

-3.03 

1798 

1799 

0.28 

0.08 

0.31 

0.51 

0.63 

0.58 

0.45 

0.99 

0.27 

-0.16 

-0.53 

-0.53 

1799 

1800 

0.31 

0.24 

-0.31 

1.92 

-0.12 

1.22 

1.15 

0.11 

0.04 

0.43 

-0.93 

1.63 

1800 

1501 

0.40 

0.46 

1.51 

0.21 

1.69 

0.08 

0.35 

0.49 

1.41 

0.96 

0.17 

0.30 

1801 

1802 

3.79 

-0.16 

0.76 

0.31 

-1.34 

0.13 

0.13 

0.88 

1.19 

1.87 

1.23 

1.19 

1802 

1803 

1.12 

2.15 

0.67 

0.38 

-0.81 

0.53 

-0.08 

1.09 

-0.24 

0.96 

-0.71 

1.99 

1803 

1804 

-0.48 

0.08 

-0.48 

-0.98 

1.55 

0.20 

-0.25 

-0.44 

0.28 

-1.05 

0.16 

-1.76 

1804 

1805 

-1.46 

1.02 

1.92 

1.45 

0.91 

0.11 

1.40 

0.82 

1.23 

-0.82 

0.13 

3.24 

1805 

1806 

0.48 

1.60 

-1.83 

-2.28 

-0.44 

-0.19 

-1.12 

-0.77 

-0.52 

-0.04 

0.15 

-0.06 

1806 

1807 

-1.05 

-1.13 

-1.30 

-0.31 

-0.80 

-0.62 

0.05 

0.00 

-1.08 

0.22 

-0.65 

2.45 

1807 

1808 

0.13 

1.41 

1.55 

0.37 

-0.74 

0.04 

-0.15 

-0.86 

0.54 

-0.72 

0.69 

0.72 

1808 

1809 

-1.15 

-1.73 

-1.36 

0.31 

-0.24 

-0.42 

-1.90 

-0.76 

-0.95 

3.00 

-2.19 

2.04 

1809 

1S10 

0.11 

0.95 

-0.68 

0.70 

0.84 

0.04 

-0.93 

-0.39 

0.46 

-0.12 

-0.24 

-0.34 

1810 

1811 

0.30 

0.14 

1.69 

-0.01 

0.65 

0.43 

0.16 

0.14 

0.58 

1.74 

0.67 

-0.34 

1811 

1812 

-1.51 

-1.16 

-2.68 

-1.05 

-3.22 

-2.04 

-2.13 

-1.64 

-2.07 

-0.30 

-0.90 

-0.73 

1812 

1813 

-1.09 

-0.34 

-2.55 

0.08 

-1.46 

-0.95 

-1.17 

0.44 

1.02 

-0.62 

0.83 

-0.70 

1813 

1814 

-0.73 

0.80 

-0.51 

1.08 

0.76 

-1.58 

-0.30 

-0.94 

-0.57 

-0.07 

0.39 

-1.78 

1814 

1815 

-0.93 

-1.98 

0.28 

-1.47 

-1.49 

-0.16 

1.12 

-1.82 

-0.50 

-0.69 

1.07 

-0.45 

1815 

1816 

-0.16 

0.07 

-2.14 

-0.44 

-1.36 

-2.36 

-2.49 

-1.31 

-1.77 

0.17 

1.79 

0.31 

1816 

1817 

-0.71 

-3.48 

-1.43 

-0.73 

-0.44 

-1.65 

-0.52 

-0.76 

0.18 

-0.70 

0.78 

w  0.68 

1817 

1818 

-0.51 

-3.56 

0.14 

-2.31 

-0.42 

1.17 

0.85 

-0.01 

-0.84 

0.61 

1.92 

-1.94 

1818 

1819 

2.45 

4.91 

-2.30 

-1.06 

-0.23 

1.33 

0.64 

0.59 

1.63 

0.64 

1.26 

-0.43 

1819 

1820 

-1.51 

1.00 

-0.22 

-0.07 

-0.23 

0.51 

1.95 

0.26 

1.52 

-0.17 

-0.98 

-2.49 

1820 

1821 

-2.75 

1.50 

-0.80 

-0.97 

-0.37 

0.36 

-1.08 

0.83 

-0.11 

-0.05 

0.42 

-1.31 

1821 

1822 

-1.60 

-0.50 

1.64 

-0.87 

1.77 

0.09 

0.44 

0.06 

1.84 

0.75 

0.96 

0.12 

1822 

1823 

0.37 

-1.99 

-0.99 

0.20 

-1.19 

-0.42 

-0.19 

0.35 

-1.63 

-0.58 

-1.72 

0.52 

1823 

1824 

2.28 

0.47 

-0.11 

0.62 

-0.84 

-0.59 

-0.14 

-1.08 

0.12 

0.21 

-0.61 

1.43 

1824 

1825 

1.30 

1.27 

2.16 

1.49 

0.69 

1.74 

2.36 

-0.12 

-1.05 

0.70 

-0.14 

0.62 

1825 

1826 

0.96 

1.11 

0.10 

-1.05 

2.95 

0.04 

1.56 

-0.13 

0.78 

0.23 

0.19 

0.55 

1826 

1827 

-1.49 

0.52 

0.64 

1.56 

-0.03 

-0.60 

-0.35 

-0.82 

-0.28 

1.13 

-2.74 

0.01 

1827 

1828 

2.42 

4.05 

1.10 

-0.97 

-0.68 

1.06 

0.36 

0.96 

0.37 

-0.19 

1.17 

2.04 

1828 

Means. 

Means. 

-2.84 

-1.85 

1.54 

6.36 

11.05  15.61 

17.97 

17.17 

13.80 

8.56 

3.53 

-0.63 

The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

E  114 


XCVI. 

ICELAND.  —  REIKIAVIK. 

For  Reducing  the  Monthly  and  Yearly  Means  of  Single  Years  to  the  Means  derived 

from  Series  of  Years. 

Degrees  of  Reaumur. 


Year. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Year. 

0 

0 

0 

o 

o 

o 

0 

o 

0 

o 

o 

0 

1823 

1.80 

-0.56 

0.40 

2.09 

-0.60 

0.06 

2.44 

1.76 

0.84 

-1.50 

0.18 

-0.86 

1823 

1824 

-0.32 

0.61 

-0.05 

2.16 

2.95 

4.63 

3.12 

1.53 

-0.73 

-2.37 

-3.64 

-3.99 

1824 

1825 

-1.07 

-0.40 

3.04 

0.98 

0.50 

0.33 

1.70 

0.66 

2.34 

1.6S 

-0.81 

-0.92 

1825 

1826 

-0.19 

2.84 

2.15 

-0.79 

1.58 

-1.10 

-0.75 

-0.18 

1.24 

1.12 

0.36 

1.17 

1826 

1827 

-0.72 

1.93 

-3.80 

-0.86 

0.67 

0.86 

0.14 

1.73 

0.64 

2.29 

2.26 

0.88 

1827 

1828 

1.98 

2.48 

1.54 

1.29 

2.37 

0.53 

3.15 

3.98 

3.07 

3.26 

0.94 

2.77 

1828 

1829 

1.02 

-0.09 

0.20 

0.56 

0.79 

0.26 

1.21 

2.21 

-0.20 

-1.16 

0.03 

1.86 

1829 

1830 

1.89 

-0.58 

-1.22 

-0.72 

2.44 

0.52 

-0.80 

0.68 

0.85 

2.09 

-0.35 

-2.60 

1830 

1831 

0.28 

-0.95 

2.5F 

1.39 

-1.76 

1.44 

-1.89 

-1.85 

-0.37 

0.95 

-0.76 

1.45 

1831 

1832 

0.71 

-0.48 

-1.77 

0.17 

-2.20 

-1.87 

-2.80 

-2.94 

-2.59 

-0.42 

1.22 

-0.29 

1832 

1833 

1.41 

-0.13 

1.93 

-0.21 

-0.57 

-0.40 

-1.96 

-2.14 

-1.22 

-0.79 

0.31 

-1.64 

1833 

1834 

-0.43 

0.10 

0.73 

0.14 

-1.35 

-1.99 

-1.81 

-2.41 

-1.44 

-1.13 

0.22 

2.76 

1834 

1835 

-4.08 

-1.92 

-1.55 

-1.32 

-2.35 

-1.97 

-1.62 

-0.38 

-0.64 

-2.41 

1.58 

1.30 

1835 

1836 

-1.86 

-3.24 

-2.00 

-3.01 

-0.37 

-0.94 

-0.59 

-2.68 

-1.80 

-1.67 

-1.52 

-1.95 

1836 

1837 

-0.42 

0.43 

-2.23 

-1.91 

-2.07 

-0.32 

0.40 

1837 

-1.00 

-0.60 

Means. 

-1.60 

-1.07 

1.84 

5.54 

8.67 

10.78 

9.27 

6.42 

2.19 

-1.15 

Means. 

XCVII.  GREENLAND.  —  GODTHAAB. 

Degrees  of  Reaumur. 

1796 

-*>  52 

1.51 

2.19 

1796 

1797 

0.91 

-2.08 

-0.73 

-1.96 

1.14 

0.27 

1.40 

1.31 

0.77 

1.02 

2.22 

0.87 

1797 

1798 

-1.30 

0.53 

3.98 

0.08 

0.37 

-0.39 

0.39 

0.07 

-0.37 

-0.67 

0.83 

-0.08 

1798 

1799 

-0.40 

3.08 

-1.87 

0.47 

0.37 

-0.71 

-0.47 

-0.72 

0.62 

-0.43 

-0.91 

4.72 

1799 

1800 

2.75 

0.22 

2.32 

-0.68 

1.52 

1.05 

0.35 

0.88 

-0.42 

0.48 

0.05 

0.07 

1800 

1801 

-0.86 

2.63 

0.00 

-1.00 

-2.86 

-1.61 

0.89 

0.92 

-0.39 

0.19 

0.22 

1.94 

1801 

1802 

1.85 

—2.99 

—3.76 

—2.68 

—0.44 

1802 

1816 

0  09 

-0.98 

-0.12 

-0.15 

-0.01 

-6.91 

1816 

1817 

-1.55 

-2.46 

-4.17 

0.37 

-1.32 

-0.79 

-1.63 

-0.28 

-0.41 

-1.65 

-0.52 

-1.73 

1817 

1818 

-5.58 

-5.13 

-4.00 

2.56 

-0.90 

-0.84 

0.52 

0.15 

-0.71 

-1.97 

-i.82 

-0.42 

1818 

1819 

-2.74 

0.94 

-0.35 

0.98 

-0.91 

-0.97 

-3.78 

-2.29 

-2.30 

1.78 

1.38 

3.15 

1819 

1820 

4.16 

0.14 

0.35 

-2.15 

0.97 

0.66 

-0.96 

-1.57 

-0.72 

-0.06 

1.60 

1.19 

1820 

1821 

0.04 

0.42 

1.30 

1.00 

—0.07 

0.68 

1821 

1841 

0  45 

0.14 

-0.27 

0.23 

1841 

1842 

1.13 

-1.15 

-1.12 

1.56 

2.03 

0.37 

0.89 

0.34 

1.39 

1.95 

-0.37 

y.in 

-1.37 

1842 

1843 

0.11 

4.74 

4.65 

2.18 

1.18 

1.16 

'  1.52 

0.72 

1.57 

1.66 

-2.89 

-3.93 

1843 

1844 

-0.13 

0.40 

-0.51 

-3.10 

-1.29 

0.79 

0.78 

1.39 

0.66 

0.19 

-1.08 

0.01 

1844 

1845 

1.54 

0.76 

3.98 

2.34 

0.24 

0.32 

1845 

-8.64 

-6.45 

Means. 

-8.72 

-7.29 

-4.44 

0.07 

3.15 

4.41 

3.93 

1.62 

-0.96 

-4.47 

Means. 

E 


The  numbers  without  sign  must  be  subtracted ;  those  with  the  sign  —  must  be  added. 

115 


CORRECTIONS 


FOR 


FORCE  OF  VAPOR  AND  RELATIVE  HUMIDITY. 


HOURLY  CORRECTIONS  FOR  PERIODIC  VARIATIONS, 


OR 


TABLES 

FOR  REDUCING  THE  MEANS  OF  THE  OBSERVATIONS  TAKEN  AT  ANY  HOUR  OF  THE 

DAY  TO  THE  TRUE  MEAN  FORCE  OF  VAPOR  AND  RELATIVE  HUMIDITY 

OF  THE  DAY,  OF  THE  MONTH,  AND  OF  THE  YEAR. 


E  117 


XCVIII. 

ENGLAND.  —  GREENWICH.     Lat.  51°  29'  N. ;  Long.  0°  0'. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation,  or  Sets  of  Hours, 
to  obtain  the  true  Mean  Force  of  Vapor  for  the  respective  Months.    (GLAISHER.) 

English  Inches. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Inch. 

Midn.  .  . 

.006 

.006 

.008 

.017 

.026 

.031 

.028 

.025 

.024 

.018 

.010 

.009 

.017 

1 

.011 

.008 

.010 

.021 

.028 

.037 

.031 

.031 

.030 

.020 

.012 

.010 

.021 

2 

.015 

.010 

.011 

.024 

.031 

.043 

.036 

.035 

.035 

.021 

.015 

.010 

.024 

3 

.015 

.011 

.013 

.027 

.032 

.048 

.038 

.039 

.037 

.023 

.017 

.011 

.026 

4 

.015 

.013 

.015 

.029 

.031 

.047 

.037 

.040 

.040 

.025 

.019 

.011 

.027 

5 

.015 

.014 

.016 

.029 

.027 

.037 

.031 

.038 

.040 

.023 

.021 

.011 

.025 

6 

.014 

.015 

.016 

.025 

.019 

.022 

.019 

.029 

.033 

.021 

.021 

.010 

.020 

7 

.013 

.014 

.014 

.016 

.007 

.008 

.007 

.014 

.022 

.018 

.018 

.009 

.013 

8 

.010 

.010 

.010 

4005 

-.005 

-.004 

-.004 

.000 

.010 

.011 

.012 

.007 

.005 

9 

.007 

.006 

.005 

?005 

-.016 

-.015 

-.014 

-.012 

-.005 

.005 

.005 

.005 

-.002 

10 

.002 

.000 

-.003 

-.013 

-.024 

-.027 

-.019 

-.021 

-.019 

-.005 

-.004 

.001 

-.010 

11 

-.004 

-.005 

-.007 

-.020 

-.028 

-.036 

-.025 

-.027 

-.027 

-.009 

-.010 

-.004 

-.017 

Noon.  .  . 

-.007 

-.009 

-.012 

-.026 

-.030 

-.042 

-.029 

-.030 

-.030 

-.015 

-.017 

-.007 

-.021 

1 

-.008 

-.013 

-.013 

-.027 

-.030 

-.045 

-.033 

-.032 

-.030 

-.018 

-.019 

-.008 

-.023 

2 

-.007 

-.015 

-.013 

-.027 

-.028 

-.043 

-.034 

-.034 

-.029 

-.017 

-.020 

-.008 

-.023 

3 

-.007 

-.012 

-.012 

-.025 

-.026 

-.039 

-.033 

-.031 

-.027 

-.014 

-.016 

-.008 

-.021 

4 

-.007 

-.010 

-.010 

-.020 

-.021 

-.035 

-.028 

-.027 

-.021 

-.009 

-.010 

-.007 

-.017 

5 

-.004 

-.006 

-.006 

-.014 

-.015 

-.025 

-.021 

-.020 

-.017 

-.006 

-.005 

-.005  -.012 

6 

-.002 

-.004 

-.002 

-.006 

-.010 

-.017 

-.016 

-.015 

-.010 

-.004 

.000 

-.003 

-.007 

7 

-.001 

-.001 

.002 

.001 

-.004 

-.007 

-.007 

-.006 

-.003 

.003 

.004 

-.001 

-.002 

8 

.000 

.001 

.004 

.005 

.005 

.005 

.004 

.004 

.004 

.005 

.006 

.001 

.004 

9 

.000 

.003 

.005 

.007 

.013 

.015 

.010 

.010 

.008 

.008 

.008 

.004 

.007 

10 

tooi 

.004 

.007 

.010 

.017 

.023 

.017 

.015 

.013 

.011 

.009 

.005 

.011 

11 

.002 

.005 

.008 

.014 

.022 

.029 

.024 

.020 

.018 

.014 

.010 

.006 

.014 

6.  6 

.006 

.005 

.007 

.009 

.005 

.003 

.001 

.007 

.012 

.008 

.010 

.004 

.006 

7.  7 

.006 

.006 

.008 

.009 

.001 

.000 

.000 

.004 

.009 

.011 

.011 

.004 

.005 

8.  8 

.005 

.005 

.007 

.005 

.000 

.000 

.000 

.002 

.007 

.008 

.009 

.004 

.005 

9.  9 

.003 

.004 

.005 

.006 

-.002 

.000 

-.002 

-.001 

.002 

.006 

.007 

.004 

.003 

10.10 

.001 

.002 

.002 

-.002 

-.003 

-.002 

-.001 

-.003 

-.003 

.003 

.002 

.003 

.000 

7.  2.  9 

.002 

.001 

.002 

-.001 

-.003 

-.007 

-.006 

-.003 

.000 

.003 

.002 

.002 

-.001 

6.  2.  8 

.002 

.000 

.002 

.001 

-.001 

-.005 

-.004 

-.000 

.003 

.003 

.002 

.001 

.000 

6.  2.10 

.003 

.001 

.003 

.003 

.002 

.001 

.001 

.003 

.006 

.005 

.003 

.002 

.003 

6.  2.  6 

.002 

-.001 

.000 

-.003 

-.006 

-.013 

-.010 

-.007 

-.002 

.000 

.000 

-.000 

-.003 

7.  2 

.003 

-.000 

.000 

-.005 

-.011 

-.017 

-.014 

-.010 

-.003 

.000 

-.001 

.000 

-.005 

8.  2 

.001 

-.002 

-.001 

-.011 

-.017 

-.023 

-.019 

-.017  -.009 

-.003  -.004 

-.000  -.009 

8.  1 

.001 

-.001 

-.001 

-.011 

-.017 

-.025  -.018 

-.016  -.010  -.004  -.004 

-.000 

-.009 

7.  1 

.002 

.000 

.000 

-.005 

-.012 

-.018 

-.013 

-.009 

-.004 

-.000 

-.000 

.000 

-.005 

9.12.3.9 

-.002 

-.003 

-.003 

-.010  -.015 

-.020 

-.016 

-.016 

-.013 

-.004 

-.005 

-.001 

-.009 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

119 


XCIX. 

ENGLAND.  — GREENWICH.     Lat.  51°  29'  N. ;  Long.  0°  0'. 

Corrections  to  be  applied  to  the  Means  of  the  Hours  of  Observation,  or  Sets  of  Hours, 
to  obtain  the  true  Mean  Humidity  for  the  respective  Months.     (GLAISHER.) 

Thousandths. 


Hours. 

Jan. 

Feb. 

March. 

April. 

May. 

June. 

July. 

Aug. 

Sept. 

Oct. 

Nov. 

Dec. 

Mean. 

Midn.  .  . 

-.013 

-.021 

-.063 

-.095 

-.087 

-.105 

-.091 

-.096 

-.080 

-.053 

-.018 

-.011 

-.061 

1 

.002 

-.021 

-.065 

-.106 

-.100 

-.114 

-.095 

-.104 

-.080 

-.059 

-.009 

-.012 

-.064 

2 

.004 

-.026 

-.066 

-.116 

-.108 

-.125 

-.107 

-.113 

-.085 

-.066 

-.011 

-.017 

-.069 

3 

-.003 

-.033 

-.067 

-.123 

-.113 

-.132 

-.116 

-.117 

-.091 

-.070 

-.020 

-.019 

-.075 

4 

-.013 

-.036 

-.068 

-.126 

-.114 

-.138 

-.120 

-.123 

-.097 

-.075 

-.030 

-.024 

-.080 

5 

-.019 

-.035 

-.066 

-.125 

-.106 

-.139 

-.120 

-.123 

-.098 

-.077 

-.030 

-.024 

-.080 

6 

-.021 

-.034 

-.063 

-.112 

-.085 

-.107 

-.097 

-.107 

-.097 

-.071 

-.033 

-.026 

-.071 

7 

-.020 

-.030 

-.055 

-.080 

-.059 

-.065 

-.055 

-.061 

-.080 

-.058 

-.031 

-.025 

-.052 

8 

-.020 

-.020 

-.035 

-.065 

-.024 

-.015 

-.005 

-.020 

-.047 

-.037 

-.021 

-.018 

-.027 

9 

-.017 

-.007 

-.003 

-.034 

.018 

.035 

.041 

.030 

.000 

-.009 

-.008 

-.007 

.003 

10 

-.004 

.009 

.031 

-.015 

.051 

.078 

.080 

.070 

.042 

.025 

.008 

.008 

.032 

11 

.011 

.028 

.060 

.022 

.083 

.100 

.104 

.102 

.082 

.060 

.027 

.022 

.058 

Noon.  .  . 

.031 

.045 

.084 

.070 

.110 

.123 

.114 

.127 

.115 

.088 

.040 

.033 

.082 

1 

.054 

.058 

.100 

.182 

.126 

.137 

.119 

.142 

.131 

.109 

.050 

.046 

.100 

2 

.059 

.065 

.106 

.151 

.125 

.135 

.123 

.145 

.132 

.113 

.054 

.048 

.105 

3 

.048 

.065 

.104 

.147 

.118 

.123 

.121 

.138 

.126 

.108 

.047 

.036 

.098 

4 

.036 

.053 

.087 

.128 

.108 

.113 

.111 

.120 

.103 

.089 

.032 

.024 

.084 

5 

.021 

.032 

.063 

.110 

.091 

.099 

.095 

.100 

.071 

.055 

.018 

.013 

.064 

G 

.007 

.009 

.038 

.088 

.074 

.078 

.062 

.071 

.044 

.030 

.005 

.004 

.042 

7 

-.005 

-.010 

.010 

.059 

.052 

.049 

.025 

.036 

.009 

.007 

-.005 

-.003 

.019 

8 

-.014 

-.023 

-.010 

.020 

.022 

.010 

-.015 

.000 

-.015 

-.011 

-.012 

-.005 

-.004 

9 

-.016 

-.029 

-.032 

-.030 

-.018 

-.025 

-.040 

-.038 

-.040 

-.025 

-.017 

-.007 

-.026 

10 

-.019 

-.030 

-.048 

-.058 

-.050 

-.060 

-.068 

-.067 

-.058 

-.039 

-.020 

-.008 

-.044 

11 

-.018 

-.036 

-.060 

-.080 

-.075 

-.085 

-.080 

-.085 

-.071 

-.048 

-.020 

-.009 

-.055 

6.  6 

-.007 

-.012 

-.012 

-.012 

-.005 

-.015 

-.017 

-.018 

-.027 

-.020 

-.014 

-.011 

-.015 

7.  7 

-.012 

-.020 

-.023 

-.010 

-.004 

-.008 

-.015 

-.012 

-.035 

-.026 

-.018 

-.014 

-.017 

8.  8 

-.017 

-.021 

-.023 

-.022 

-.001 

-.003 

-.010 

-.010 

-.031 

-.024 

-.016 

-.011 

-.016 

9.  9 

-.016 

-.018 

-.018 

-.032 

.000 

.005 

.000 

-.004 

-.020 

-.017 

-.012 

-.007 

-.012 

10.10 

-.011 

-.010 

-.009 

-.037 

.000 

.009 

.006 

.001 

-.008 

-.007 

-.006 

.000 

-.006 

7.  2.  9 

.008 

.002 

.006 

.014 

.016 

.015 

.009 

.015 

.004 

.010 

.002 

.005 

.009 

6.  2.  8 

.008 

.003 

.011 

.019 

.021 

.013 

.004 

.013 

.016 

.010 

.003 

.006 

.010 

6.  2.10 

-.006 

.000 

-.002 

-.006 

-.003 

-.010 

-.014 

-.009 

-.008 

.001 

.000 

.005 

-.003 

6.  2.  6 

.015 

.013 

.027 

.042 

.038 

.035 

.029 

.036 

.026 

.024 

.009 

.009 

.025 

7.  2 

.019 

.017 

.026 

.036 

.033 

.035 

.034 

.042 

.026 

.027 

.012 

.011 

.026 

8.  2 

.019 

.022 

.036 

.043 

.050 

.060 

.059 

.062 

.042 

.038 

.016 

.015 

.039 

8.  1 

.017 

.019 

.032 

.034 

.051 

.061 

.057 

.061 

.042 

.036 

.014 

.014 

.037 

7.  1 

.017 

.014 

.023 

.026 

.033 

.036 

.032 

.041 

.025 

.026 

.009 

.010 

.024 

9.12.3.9 

.011 

-.018 

.038 

.038 

.032 

.064 

.059 

.064 

.050 

.040 

.016 

.014 

.037 

E 


The  numbers  without  sign  must  be  added ;  those  with  the  sign  —  must  be  subtracted. 

120 


METEOROLOGICAL   TABLES. 


VI. 
MISCELLANEOUS  TABLES, 


USEFUL  IN 


TERRESTRIAL  PHYSICS  AND  METEOROLOGY. 


CONTENTS. 


TABLE  I.     Position  of  the  Principal  Observatories.     From  the  American  Nauti- 
cal Almanac.     ........  4 

"  II.  To  convert  Parts  of  the  Equator  in  Arc  into  Sidereal  Time,  or  to  con- 
vert Terrestrial  Longitude  in  Arc  into  Time.  From  Downes, 
U.  S.  Almanac  for  1845,  as  given  in  Lee's  Tables  and  Formula, 
2d  edition,  p.  146  et  seq Q 

"     III.     To  convert  Sidereal  Time  into  Parts  of  the  Equator  in  Arc,  or  to 
convert  Time  into  Terrestrial  Longitude  in  Arc.     From  Downes, 
U.  S.  Almanac  for  1845,  p.  150,  and  Lee's  Tables  and  Formula.       8 
IV.     For  converting  Sidereal  Time  into  Mean  Solar  Time,  and  Mean 

Solar  Time  into  Sidereal  Time.    From  Lee's  Tables  and  Formula.       9 

"      V.     Correction  of  the  Time  obtained  by  Observation  of  the  Sun,  in  order 
to  have  the  True  Time  of  the  Clock.     Communicated  by  Prof. 
B.  Peirce,  of  Harvard  University.        ..*...     10 
VI.     For  computing  Terrestrial  Surfaces,  by  Delcros.    From  the  Annuaire 

Meteor  ologique  de  la  France  for  1850,  p.  73  et  seq.     .        .        .12 


F 


I. 


POSITIONS  OF  THE  PRINCIPAL  OBSERVATORIES. 

[From  the  American  Nautical  Almanac.] 
(North  Latitudes  and  West  Longitudes  are  considered  as  positive.) 


Place. 

Latitude. 

Longitude 
from  Washington 
in  Tune. 

Longitude 
from  Washington 
in  Arc. 

Longitude 
from  Greenwich  in 
Arc. 

Abo, 

+60  26   56.8 

h.    in.    s. 
-  6  37  20.0 

0        I           n 

260  40     0.6 

0         1           J| 

337  42  48.6 

Altona, 

53   32  45.3 

5  47  57.4 

273     0  39.8 

350     3  27.8 

Athens, 

37  58  20 

6  43     6.4 

259   13   24.2 

336   16   12.2 

Berlin, 

52  30  16.7 

6     1   46.1 

269  33  28.1 

346  36   16.1 

Bilk, 

51   12  25 

5  35   16.1 

276   10  58.1 

353   13   46.1 

Bonn, 

50  43  45.0 

5  36  35.7 

275   51     5.1 

352   53   53.1 

Breslau, 

51     6  56.0 

6  16  21.2 

265   54  42.0 

342   57  30.0 

Brussels, 

50  51   10.7 

5  25  38.8 

278   35   18.0 

355  38     6.0 

Cambridge  (Eng.), 

52   12  51.8 

5     8  34.7 

282  51   18.9 

359   54     6.9 

Cambridge  (Mass.), 

+42   22   48.6 

0  23  41.5 

354     4  36.9 

71     7  24.9 

,  Cape  of  Good  Hope, 

-33  56     3 

6  22     7.2 

264  28  12.3 

341   31     0.3 

Christiania, 

+59   54  43.7 

-  5  51     6.0 

272   13  30.6 

349   16   18.6 

Cincinnati, 

39     5  54 

+  0  29  46.9 

7  26  42.8 

84  29  30.8 

Copenhagen, 

55  40  53.0 

-  5   58   30.5 

270  22   22.5 

347  25   10.5 

Cracow, 

50     3  50.0 

6  28     2.4 

262  59  23.4 

340     2   11.4 

Dorpat, 

58  22  47.1 

6  55     5.8 

256   13  33.6 

333   16  21.6 

Dublin, 

53   23   13 

4  42  49.2 

289  17  42.0 

6  20  30.0 

Durham, 

54  46     6.4 

5     1    53.2 

284  31   42.0 

1   34  30.0 

Edinburgh, 

55  57  23.2 

4  55   28.2 

286     7  57.0 

3   10  45.0 

Florence, 

43  46  40.8 

5   53   12.9 

271   41  47.1 

348   44   35.1 

Geneva, 

46  11   58.8 

-  5  32  48.9 

276  47  46.8 

353  50  34.8 

Georgetown, 

38  54  26.1 

+  0     0     6.2 

0     1  33.0 

77     4  21.0 

Gottingen, 

51   31   47.9 

-  5  47  57.3 

273     0  40.5 

350     3  28.5 

Gotha, 

50  56     5.2 

5  51     6.9 

272    13   17.1 

349   16     5.1 

Greenwich, 

51   28  38.2 

5     8   11.2 

282  57  12.0 

000 

Hamburg, 

53  33     7 

-  5  48     4.8 

272  58  48.6 

350     1  36.6 

Hudson, 

41   14  42.6 

+  0  17  32.1 

4  23     0.9 

81  25  48.9 

Kasan, 

55   47  23.1 

-  8   24  43.1 

233  49   13.1 

310  52     1.1 

Konigsberg, 

54  42   50.4 

6  30   11.6 

262  27     6.6 

339  29  54.6 

Kremsmunster, 

48     3  23.8 

6     4  44.6 

268  48  50.7 

345  51   38.7 

Leipsic, 

51   20  20.7 

5  57  39.7 

270  35     4.5 

347  37  52.5 

Leyden, 

52     9   28.2 

5  26     8.6 

278  27  50.6 

355  30  38.6 

Liverpool, 

53   24  47.7 

4  56  11.1 

285  57  13.7 

3     0     1.7 

London, 

51   31   29.8 

5     7  34.1 

283     6  28.5 

0     9   16.5 

Madras, 

+13     4     9.2 

-10  29     8.2 

202   42  57.0 

279  45   45.0 

POSITIONS    OF   THE    PRINCIPAL    OBSERVATORIES. 


Place. 

Latitude. 

Longitude 
from  Washington 
in  Time. 

Longitude 
from  Washington 
in  Arc. 

Longitude 
from  Greenwich  in 
Arc. 

Mannheim, 

+49  29   12.9 

h.     m.    s. 
-5   42     2.7 

0        1          H 

274  29   19.5 

351   32     1.6 

Markree, 

54   10  31.7 

4  34  22.8 

291   24  18.0 

8  27     6.0 

Marseilles, 

43   17  49 

5  29  40.2 

277  34   57.2 

354  37  45.2 

Milan, 

45  23     0.7 

5  44  57.8 

273   45   32.4 

350  48   20.4 

Modena, 

44  38   52.8 

5  51   55.2 

272      1    12.5 

349     4     0.5 

Moscow, 

55  45  19.8 

7  38  28.5 

245  22  52.7 

322  25  40.7 

Munich, 

48     8   45 

5  54  37.6 

271   20  35.4 

348  23   23.4 

Naples, 

40  51   46.6 

6     5  12.1 

268  41   58.1 

345  44   46.1 

Olmiitz, 

49  35  40.0 

6   17  11.3 

265   42  10.5 

342   44  58.5 

Oxford, 

51  45  36.0 

5     3     8.6 

284   12  51.0 

1   15  39.0 

Padua, 

45  24     2.5 

5  55  40.2 

271     4  56.6 

348     7  44.6 

Palermo, 

+38     6  44 

-6     1  36.7 

269  35  50.1 

346  38  38.1 

Paramatta, 

-33   48   49.8 

+8  47  42.6 

131   55  38.3 

208  58  26.3 

Paris, 

+48   50   13.2 

-5   17  32.7 

280  36  50.1 

357  39  38.1 

St.  Petersburg, 

59  56  29.7 

7     9   24.7 

252  38  49.8 

329  41   37.8 

Philadelphia, 

39  57     7.5 

0     7  33.6 

358     6  35.4 

75     9   23.4 

Prague, 

50     5   18.5 

6     5  53.2 

268  31   42.6 

345   34  30.6 

Pulkowa, 

59  46   18.7 

7     9  29.9 

252  37  31.9 

329   40   19.9 

Rome, 

41   53   54 

5  58     5.9 

270  28  31.5 

347  31   19.5 

San  Fernando, 

+36  27  45 

4  43  22.1 

289     9  29.1 

6   12   17.1 

Santiago, 

-33  26   24.8 

0  25  52.3 

353  31   55.5 

70  34  43.5 

Senftenberg, 

+50     5   10.1 

6   14     1.1 

266  29  43.1 

343  32   31.1 

Vienna,     , 

48   12  35.5 

6   13  43.7 

266   34     4.1 

343   36   52.1 

Washington, 

38  53  39.3 

000 

000 

77     2   48.0 

Wilna, 

+54  40  59.1 

-6  49  23.0 

257  39   15.5 

334  42     3.5 

II.       TO    CONVERT    PARTS    OF   THE    EQUATOR    IN    ARC    INTO    SIDEREAL    TIME,    OR 
TO    CONVERT    TERRESTRIAL    LONGITUDE    IN    ARC    INTO    TIME. 


DEGREES. 

Arc. 

Time. 

Arc. 

Time. 

Arc. 

Time. 

Arc. 

Time. 

Arc. 

Time. 

Arc. 

Time. 

0 

h.  m. 

0 

h.  m. 

o 

h.  m. 

0 

h.  m. 

o 

h.  m. 

0 

h.  m. 

1 

0  4 

41 

2  44 

81 

5  24 

121 

8  4 

161 

10  44 

201 

13  24 

2 

0  8 

42 

2  48 

82 

5  28 

122 

8  8 

162 

10  48 

202 

13  28 

3 

0  12 

43 

2  52 

83 

5  32 

123 

8  12 

163 

10  52 

203 

13  32 

4 

0  16 

44 

2  56 

84 

5  36 

124 

8  16 

164 

10  56 

204 

13  36 

5 

0  20 

45 

3  0 

85 

5  40 

125 

8  20 

165 

11  0 

205 

13  40 

6 

0  24 

46 

3  4 

86 

5  44 

126 

8  24 

166 

11  4 

206 

13  44 

7 

0  28 

47 

3  8 

87 

5  48 

127 

8  28 

167 

11  8 

207 

13  48 

8 

0  32 

48 

3  12 

88 

5  52 

128 

8  32 

168 

11  12 

208 

13  52 

9 

0  36 

49 

3  16 

89 

5  56 

129 

8  36 

169 

11  16 

209 

13  56 

10 

0  40 

50 

3  20 

90 

6  0 

130 

8  40 

170 

11  20 

210 

14  0 

11 

0  44 

51 

3  24 

91 

6  4 

131 

8  44 

171 

11  24 

211 

14  4 

12 

0  48 

52 

3  28 

92 

6  8 

132 

8  48 

172 

11  28 

212 

14  8 

13 

0  52 

53 

3  32 

93 

6  12 

133 

8  52 

173 

11  32 

213 

14  12 

14 

0  56 

54 

3  36 

94 

6  16 

134 

8  56 

174 

11  36 

214 

14  16 

15 

1  0 

55 

3  40 

95 

6  20 

135 

9  0 

175 

11  40 

215 

14  20 

16 

1  4 

56 

3  44 

96 

6  24 

136 

9  4 

176 

11  44 

216 

14  24 

17 

1  8 

57 

3  48 

97 

6  28 

137 

9  8 

177 

11  48 

217 

14  28 

18 

1  12 

58 

3  52 

98 

6  32 

138 

9  12 

178 

11  52 

218 

14  32 

19 

1  16 

59 

3  56 

99 

6  36 

139 

9  16 

179 

11  56 

219 

14  36 

20 

1  20 

60 

4  0 

100 

6  40 

140 

9  20 

180 

12  0 

220 

14  40 

21 

1  24 

61 

4  4 

101 

6  44 

141 

9  24 

181 

12  4 

221 

14  44 

22 

1  28 

62 

4  8 

102 

6  48 

142 

9  28 

182 

12  8 

222 

14  48 

23 

1  32 

63 

4  12 

103 

6  52 

143 

9  32 

183 

12  12 

223 

14  52 

24 

1  36 

64 

4  16 

104 

6  56 

144 

9  36 

184 

12  16 

224 

14  56 

25 

1  40 

65 

4  20 

105 

7  0 

145 

9  40 

185 

12  20 

225 

15  0 

26 

1  44 

66 

4  24 

106 

7  4 

146 

9  44 

186 

12  24 

226 

15  4 

27 

1  48 

67 

4  28 

107 

7  8 

147 

9  48 

187 

12  28 

227 

15  8 

28 

1  52 

68 

4  32 

108 

7  12 

148 

9  52 

188 

12  32 

228 

15  12 

29 

1  56 

69 

4  36 

109 

7  16 

149 

9  56 

189 

12  36 

229 

15  16 

30 

2  0 

70 

4  40 

110 

7  20 

150 

10  0 

190 

12  40 

230 

15  20 

31 

2  4 

71 

4  44 

111 

7  24 

151 

10  4 

191 

12  44 

231 

15  24 

32 

2  8 

72 

4  48 

112 

7  28' 

152 

10  8 

192 

12  48 

232 

15  28 

33 

2  12 

73 

•4  52 

113 

7  32 

153 

10  12 

193 

12  52 

233 

15  32 

34 

2  16 

74 

4  56 

114 

7  36 

154 

10  16 

194 

12  56 

234 

15  36 

35 

2  20 

75 

5  0 

115 

7  40 

155 

10  20 

195 

13  0 

235 

15  40 

36 

2  24 

76 

5  4 

116 

7  44 

156 

10  24 

196 

13  4 

236 

15  44 

37 

2  28 

77 

5  8 

117 

7  48 

157 

10  28 

197 

13  8 

237 

15  48 

38 

2  32 

78 

5  12 

118 

7  52 

158 

10  32 

198 

13  12 

238 

15  52 

39 

2  36 

79 

5  16 

119 

7  56 

159 

10  36 

199 

13  16 

239 

15  56 

40 

2  40 

80 

5  20 

120 

8  0 

160 

10  40 

200 

13  20 

240 

16  0 

TO    CONVERT   PARTS    OF    THE    EQUATOR    IN    ARC    INTO    SIDEREAL    TIME,   OR 
TO    CONVERT    TERRESTRIAL    LONGITUDE    IN    ARC    INTO    TIME. 


DEGREES. 

Arc. 

Time. 

Arc. 

Time. 

Arc. 

Time. 

Arc. 

Time. 

Arc. 

Time. 

Arc. 

Time. 

0 

h.  m. 

0 

h.  m. 

0 

h.  m. 

0 

h.  m. 

0 

h.  m. 

0 

h.  m. 

241 

16  4 

261 

17  24 

281 

18  44 

301 

20  4 

321 

21  24 

341 

22  44 

242 

16  8 

262 

17  28 

282 

18  48 

302 

20  8 

322 

21  28 

342 

22  48 

243 

16  12 

263 

17  32 

283 

18  52 

303 

20  12 

323 

21  32 

343 

22  52 

244 

16  16 

264 

17  36 

284 

18  56 

304 

20  16 

324 

21  36 

344 

22  56 

245 

16  20 

265 

17  40 

285 

19  0 

305 

20  20 

325 

21  40 

345 

23  0 

246 

16  24 

266 

17  44 

286 

19  4 

306 

20  24 

326 

21  44 

346 

23  4 

247 

16  28 

267 

17  48 

287 

19  8 

307 

20  28 

327 

21  48 

347 

23  8 

248 

16  32 

268 

17  52 

288 

19  12 

308 

20  32 

328 

21  52 

348 

23  12 

249 

16  36 

269 

17  56 

289 

19  16 

309 

20  36 

329 

21  56 

349 

23  16 

250 

16  40 

270 

18  0 

290 

19  20 

310 

20  40 

330 

22  0 

350 

23  20 

251 

16  44 

271 

18  4 

291 

19  24 

311 

20  44 

331 

22  4 

351 

23  24 

252 

16  48 

272 

18  8 

292 

19  28 

312 

20  48 

332 

22  8 

352 

23  28 

253 

16  52 

27? 

IS  12 

293 

19  32 

313 

20  52 

333 

22  12 

353 

23  32 

254 

16  56 

274 

18  16 

294 

19  36 

314 

20  56 

334 

22  16 

354 

23  36 

255 

17  0 

275 

18  20 

295 

19  40 

315 

21  0 

335 

22  20 

355 

23  40 

256 

17  4 

276 

18  24 

296 

19  44 

316 

21  4 

336 

22  24 

356 

23  44 

257 

17  8 

277 

18  28 

297 

19  48 

317 

21  8 

337 

22  28 

357 

23  48 

258 

17  12 

278 

18  32 

298 

19  52 

318 

21  12 

338 

22  32 

358 

23  52 

259 

17  16 

279 

18  36 

299 

19  56 

319 

21  16 

339 

22  36 

359 

23  56 

260 

17  20 

280 

18  40 

300 

20  0 

320 

21  20 

340 

22  40 

360 

24  0 

MINUTES. 

/ 

m.  s. 

, 

m.  s. 

, 

m.  s. 

/ 

m.  s. 

/ 

m.  s. 

/ 

m.  s.« 

1 

0  4 

11 

0  44 

21 

24 

31 

2  4 

41 

2  44 

51 

3  24 

2 

0  8 

12 

0  48 

22 

28 

32 

2  8 

42 

2  48 

52 

3  28 

3 

0  12 

13 

0  52 

23 

32 

33 

2  12 

43 

2  52 

53 

3  32 

4 

0  16 

14 

0  56 

24 

36 

34 

2  16 

44 

2  56 

54 

3  36 

5 

0  20 

15 

1  0 

25 

40 

35 

2  20 

45 

3  0 

55 

3  40 

6 

0  24 

16 

4 

26 

44 

36 

2  24 

46 

3  4 

56 

3  44 

7 

0  28 

17 

8 

27 

48 

37 

2  28 

47 

3  8 

57 

3  48 

8 

0  32 

18 

12 

28 

52 

38 

2  32 

48 

3  12 

58 

3  52 

9 

0  36 

19 

16 

29 

56 

39 

2  36 

49 

3  16 

59 

3  56 

10 

0  40 

20 

20 

30 

2  0 

40 

2  40 

50 

3  20 

60 

4  0 

SECONDS. 

H 

s. 

n 

s. 

n 

s. 

„ 

s. 

n 

a. 

s. 

1 

0.067 

11 

0.733 

21 

1.400 

31 

2.067 

41 

2.733 

51 

3.400 

2 

0.133 

12 

O.SOO 

22 

1.467 

32 

2.133 

42 

2.800 

52 

3.467 

3 

0.200 

13 

0.867 

23 

1.533 

33 

2.200 

43 

2.867 

53 

3.533 

4 

0.267 

14 

0.933 

24 

1.600 

34 

2.267 

44 

2.933 

54 

3.600 

5 

0.333 

15 

1.000 

25 

1.667 

35 

2.333 

45 

3.000 

55 

3.667 

6 

0.400 

16 

1.067 

26 

1.733 

36 

2.400 

46 

3.067 

56 

3.733 

7 

0.467 

17 

1.133 

27 

1.800 

37 

2.467 

47 

3.133 

57 

3.800 

8 

0.533 

18 

1.200 

28 

1.867 

38 

2.533 

48 

3.200 

58 

3.867 

9 

0.600 

19 

1.267 

29 

1.933 

39 

2.600 

49 

3.267 

59 

3.933 

10 

0.667 

20 

1.333 

30 

2.000 

40 

2.667 

50 

3.333 

60 

4.000 

III.       TO    CONVERT    SIDEREAL    TIME    INTO    PARTS    OF    THE    EQUATOR    IN    ARC,    OR 
TO    CONVERT    TIME    INTO    TERRESTRIAL    LONGITUDE    IN    ARC. 


HOURS. 

Time. 

Arc. 

Time. 

Arc 

Time. 

Arc. 

Time. 

Arc. 

Time. 

Arc. 

Time. 

Arc. 

h. 

o 

h. 

o 

h. 

0 

h. 

o 

h. 

0 

h. 

o 

1 

15 

5 

75 

9 

135 

13 

195 

17 

255 

21 

315 

2 

30 

6 

90 

10 

150 

14 

210 

18 

270 

22 

330 

3 

45 

7 

105 

11 

165 

15 

225 

19 

285 

23 

345 

4 

60 

8 

120 

12 

180 

16 

240 

20 

300 

24 

360 

MINUTES. 

m." 

o  / 

m. 

o  / 

m. 

o  / 

m. 

0   / 

m. 

o  / 

m. 

o  / 

1 

0  15 

11 

2  45 

21 

5  15 

31 

7  45 

41 

10  15 

51 

12  45 

2 

0  30 

12 

3  0 

22 

5  30 

32 

8  0 

42 

10  30 

52 

13  0 

3 

0  45 

13 

3  15 

23 

5  45 

33 

8  15 

43 

10  45 

53 

13  15 

4 

1  0 

14 

8  30 

24 

6  0 

34 

8  30 

44 

11  0 

54 

13  30 

5 

1  15 

15 

3  45 

25 

6  15 

35 

8  45 

45 

11  15 

55 

13  45 

6 

1  30 

16 

4  0 

26 

6  30 

36 

9  0 

46 

11  30 

56 

14  0 

7 

1  45 

17 

4  15 

27 

6  45 

37 

9  15 

47 

11  45 

57 

14  15 

8 

2  0 

18 

4  30 

28 

7  0 

38 

9  30 

48 

12  0 

58 

14  30 

9 

2  15 

19 

4  45 

29 

7  15 

39 

9  45 

49 

12  15 

59 

14  45 

10 

2  30 

20 

5  0 

30 

7  30 

40 

10  0 

50 

12  30 

60 

15  0 

SECONDS. 

s. 

/  // 

s. 

,  „ 

s. 

/  // 

s. 

/  // 

s. 

/   // 

s. 

/   a 

1 

0  15 

11 

2  45 

21 

5  15 

31 

7  45 

41 

10  15 

51 

12  45 

2 

0  30 

12 

3  0 

22 

5  30 

32 

8  0 

42 

10  30 

52 

13  0 

3 

0  45 

13 

3  15 

23 

5  45 

33 

8  15 

43 

10  45 

53 

13  15 

4 

1  0  . 

14 

3  30 

24 

6  0 

34 

8  30 

44 

11  0 

54 

13  30 

5 

1  15 

15 

3  45 

25 

6  15 

35 

8  45 

45 

11  15 

55 

13  45 

.6 

1  30 

16 

4  0 

26 

6  30 

36 

9  0 

46 

11  30 

56 

14  0 

7 

1  45 

17 

4  15 

27 

6  45 

37 

9  15 

47 

11  45 

57 

14  15 

8 

2  0 

18 

4  30 

28 

7  0 

38 

9  30 

48 

12  0 

58 

14  30 

9 

2  15 

19 

4  45 

29 

7  15 

39 

9  45 

49 

12  15 

59 

14  45 

10 

2  30 

20 

5  0 

80 

7  30 

40 

10  0 

50 

12  30 

60 

15  0 

TENTHS  OP  SECONDS. 

a. 

H 

s. 

ii 

s. 

H 

s. 

„ 

3. 

// 

s. 

a 

0.01 

0.15 

0.18 

2.70 

0.35 

5.25 

0.52 

7.80 

0.69 

10.35 

0.86 

12.90 

0.02 

0.30 

0.19 

2.85 

0.36 

5.40 

0.53 

7.95 

0.70 

10.50 

0.87 

13.05 

0.03 

0.45 

0.20 

3.00 

0.37 

5.55 

0.54 

8.10 

0.71 

10.65 

0.88 

13.20 

0.04 

0.60 

0.21 

3.15 

0.38 

5.70 

0.55 

8.25 

0.72 

10.80 

0.89 

13.35 

0.05 

0.75 

0.22 

3.30 

0.39 

5.85 

0.56 

8.40 

0.73 

10.95 

0.90 

13.50 

0.06 

0.90 

0.23 

3.45 

0.40 

6.00 

0.57 

8.55 

0.74 

11.10 

0.91 

13.65 

0.07 

1.05 

0.24 

3.60 

0.41 

6.15 

0.58 

8.70 

0.75 

11.25 

0.92 

13.80 

0.08 

1.20 

0.25 

3.75 

0.42 

6.30 

0.59 

8.85 

0.76 

11.40 

0.93 

13.95 

0.09 

1.35 

0.26 

3.90 

0.43 

6.45 

0.60 

9.00 

0.77 

11.55 

0.94 

14.10 

0.10 

1.50 

0.27 

4.05 

0.44 

6.60 

0.61 

9.15 

0.78 

11.70 

0.95 

14.25 

0.11 

1.65 

0.28 

4.20 

0.45 

6.75 

0.62 

9.30 

0.79 

11.85 

0.96 

14.40 

0.12 

1.80 

0.29 

4.35 

0.46 

6.90 

0.63 

9.45 

0.80 

12.00 

0.97 

14.55 

0.13 

1.95 

0.30 

4.50 

0.47 

7.05 

0.64 

9.60 

0.81 

12.15 

0.98 

14.70 

0.14 

2.10 

0.31 

4.65 

0.48 

7.20 

0.65 

9.75 

0.82 

12.30 

0.99 

14.85 

0.15 

2.25 

0.32 

4.80 

0.49 

7.35 

0.66 

9.90 

0.83 

12.45 

1.00 

15.00 

0.16 

2.40 

0.33 

4.95 

0.50 

7.50 

0.67 

10.05 

0.84 

12.60 

0.17 

2.55 

0.34 

5.10 

0.51 

7.65 

0.68 

10.20 

0.85 

12.75 

IV.    FOR  CONVERTING  SIDEREAL  TIME    INTO  MEAN  SOLAR  TIME, 
AND   MEAN  TIME  INTO   SIDEREAL  TIME. 


HOURS. 

MINUTES. 

SECONDS. 

Hours 

Mean 
Time. 

Sidereal 
Time. 

Min- 
utes. 

Mean 
Time. 

Sidereal 
Time. 

Min- 
utes. 

Mean 
Time. 

Sidereal 
Time. 

Sec- 
onds. 

Mean 
or 
Sidereal 
Time. 

Sec- 
onds. 

Mean 
or 
Sidereal 
Time. 

m      s. 

m,     s. 

a. 

s. 

S. 

s. 

8. 

s. 

1 

0    9.83 

0    9.86 

1 

0.16 

0.16 

31 

5.08 

5.09 

1 

0.00 

31 

0.09 

2 

0  19,66 

0  19.71 

2 

0.33 

0.33 

32 

5.24 

5.26 

2 

0.01 

32 

0.09 

3 

0  29.49 

0  29.57 

3 

0.49 

0.49 

33 

5.41 

5.42 

3 

0.01 

33 

0.09 

4 

0  39.32 

0  39.43 

4 

0.66 

0.66 

34 

5.57 

5.59 

4 

0.01 

34 

0.09 

5 

0  49.15 

0  49.28 

5 

0.82 

0.82 

35 

5.75 

5.75 

5 

0.01 

35 

0.10 

6 

0  58.98 

0  59.14 

6 

0.98 

0.99 

36 

5.90 

5.91 

6 

0.02 

36 

0.10 

7 

1    8,81 

1     9.00 

7 

1.15 

1.15 

37 

6.06 

6.08 

7 

0.02 

37 

0.10 

8 

1  18.64 

1  18.85 

8 

1.31 

1.31 

38 

6.23 

6.24 

8 

0.02 

38 

0.10 

9 

1  28.47 

1  28.71 

9 

1.47 

1.48 

39 

6.39 

6.41 

9 

0.03 

39 

0.11 

10 

1  38.30 

1  38.57 

10 

1.64 

1.64 

40 

6.55 

6.57 

10 

0.03 

40 

0.11 

11 

1  48.13 

1  48.42 

11 

1.80 

1.81 

41 

6.72 

6.74 

11 

0.03 

41 

0.11 

12 

1  57.96 

1  58.28 

12 

1.97 

1.97 

42 

6.88 

6.90 

12 

0.03 

42 

0.12 

13 

2    7.78 

2    8.13 

13 

2  13 

2.14 

43 

7.05 

7.06 

13 

0.04 

43 

0.12 

14 

2  17.61 

2  17.99 

14 

2.29 

2.30 

44 

7.21 

7.23 

14 

0.04 

44 

0.12 

15 

2  27.44 

2  27.85 

15 

2.46 

2.46 

45 

7.37 

7.39 

15 

0.04 

45 

0.12 

16 

2  37.27 

2  37.70 

16 

2.62 

2.63 

46 

7.54 

7.56 

16 

0.04 

46 

0,13 

17 

2  47.10 

2  47.56 

17 

2.79 

2.79 

47 

7.70 

7.72 

17 

0.05 

47 

0.13 

18 

2  56.93 

2  57.42 

18 

2.95 

2.96 

48 

7.86 

7.89 

18 

0.05 

48 

0.13 

19 

3    6.76 

3    7.27 

19 

3.11 

3,12 

49 

8.03 

8.05 

19 

0.05 

49 

0.13 

20 

3  16.59 

3  17.13 

20 

3.28 

3.29 

50 

8.19 

8.21 

20 

0.06 

50 

0.14 

21 

3  26.42 

3  26.99 

21 

3.44 

3.45 

51 

8.36 

8.38 

21 

0.06 

51 

0.14 

22 

3  36.25 

3  36.84 

22 

3.60 

3.61 

52 

8.52 

8.54 

22 

0.06 

52 

0.14 

23 

3  46.08 

3  46.70 

23 

3.77 

3.79 

53 

8.68 

8.71 

23 

0.06 

53 

0-15 

24 

3  55.91 

3  56.56 

24 

3.93 

3.94 

54 

8.85 

8.87 

24 

0.07 

54 

0.15 

25 

4    5.74 

4    6.41 

25 

4.10 

4.11 

55 

9.01 

9.04 

25 

0.07 

55 

0.15 

26 

4  15.57 

4  16.27 

26 

4.26 

4.27 

56 

9.17 

9.20 

26 

0.07 

56 

0.15 

27 

4  25.40 

4  26.13 

27 

4.42 

4.43 

57 

9.34 

9.36 

27 

0.07 

57 

0.16 

28 

4  35.23 

4  35.98 

28 

4.59 

4.60 

58 

9-50 

9.53 

28 

0.08 

58 

0.16 

29 

4  45.06 

4  45.84 

29 

4.75 

4.76 

59 

9.67 

9.69 

29 

0.08 

59 

0.16 

30 

4  54.89 

4  55.69 

30 

4.92 

4.93 

60 

9.83 

9.86 

30 

0.08 

60 

0.16 

V. 


CORRECTION  OF  THE  TIME   OBTAINED  BY  OBSERVATION  OF  THE   SUN,  IN 

.ORDER  TO  HAVE  THE  TRUE  TIME  OF  THE  CLOCK. 


Day  of 

Month. 

Jan. 
Add. 

Feb. 
Add. 

Mar. 
Add. 

Apr. 
Add. 

Apr. 
Subt. 

May. 
Subt. 

June. 
Subt. 

June. 
Add. 

July. 

Add. 

Aug. 

Sept. 

Oct. 
Subt. 

Nov. 
Subt. 

Dec. 

Subt. 

Dec. 

Add. 

Day  of 
Month. 

Add. 

Subt. 

1 

Min. 
4 

Min. 
14 

Min. 
13 

Min. 
4 

Min. 

Min. 
3 

Min. 
3 

Min. 

Min. 
3 

Min. 
6 

Min. 
0 

Min. 
10 

Min. 
16 

Min. 
11 

Min. 

1 

2 

4 

14 

12 

4 

.  . 

3 

2 

.  . 

4 

6 

0 

11 

16 

10 

.  . 

2 

3 

5 

14 

12 

3 

.  . 

3 

2 

.  . 

4 

6 

1 

11 

16 

10 

.  . 

3 

4 

5 

14 

12 

3 

.  . 

3 

2 

.  . 

4 

6 

1 

11 

16 

10 

.  . 

4 

5 

6 

14 

12 

3 

.  . 

4 

2 

.  . 

4 

6 

1 

12 

16 

9 

.  . 

5 

6 

6 

14 

12 

2 

.  . 

4 

2 

.  . 

4 

6 

2 

12 

16 

9 

.  . 

6 

7 

7 

14 

11 

2 

.  . 

4 

2 

.  . 

4 

5 

2 

12 

16 

8 

.  . 

7 

8 

7 

15 

11 

2 

.  . 

4 

1 

5 

5 

2 

12 

16 

8 

.  . 

8 

9 

8 

15 

11 

2 

.  . 

4 

1 

.  . 

5 

5 

3 

13 

16 

7 

.  . 

9 

10 

8 

15 

11 

1 

.  . 

4 

1 

.  . 

5 

5 

3 

13 

16 

7 

.  . 

10 

11 

9 

15 

10 

1 

.  . 

4 

1 

.  . 

5 

5 

3 

13 

16 

6 

.  . 

11 

12 

9 

15 

10 

1 

.  . 

4 

1 

.  . 

5 

5 

4 

13 

16 

6 

.  . 

12 

13 

9 

15 

10 

1 

.  . 

4 

0 

.  . 

5 

5 

4 

14 

16 

5 

.  . 

13 

14 

10 

14 

9 

0 

.  . 

4 

0 

.  . 

5 

4 

5 

14 

15 

5 

.  . 

14 

15 

10 

14 

9 

0 

.  . 

4 

0 

.  . 

6 

4 

5 

14 

15 

4 

.  . 

15 

16 

10 

14 

9 

0 

.  . 

4 

0 

.  . 

6 

4 

5 

14 

15 

4 

.  . 

16 

IT 

11 

14 

9 

0 

.  . 

4 

0 

.  . 

6 

4 

6 

15 

15 

3 

.  . 

17 

18 

11 

14 

8 

.  . 

1 

4 

.  . 

1 

6 

4 

6 

15 

15 

3 

.  . 

18 

19 

11 

14 

8 

.  . 

1 

4 

.  . 

1 

6 

3 

6 

15 

14 

2 

.  . 

19 

20 

11 

14 

8 

.  . 

1 

4 

1 

6 

3 

7 

15 

14 

2 

.  . 

20 

21 

12 

14 

7 

.  . 

1 

4 

1 

6 

3 

7 

15 

14 

1 

.  . 

21 

22 

12 

14 

7 

.  . 

2 

4 

.  . 

2 

6 

3 

7 

15 

14 

1 

.  . 

22 

23 

12 

14 

7 

.  . 

2 

4 

.  . 

2 

6 

2 

8 

16 

13 

0 

.  . 

23 

24 

12 

13 

6 

.  . 

2 

3 

.  . 

2 

6 

2 

8 

16 

13 

0 

.  . 

24 

25 

13 

13 

6 

.  . 

2 

3 

.  . 

2 

6 

2 

,8 

16 

13 

0 

.  . 

25 

26 

13 

13 

6 

.  . 

2 

3 

.  . 

2 

6 

2 

9 

16 

12 

.  . 

1 

26 

27 

13 

13 

5 

.  . 

2 

3 

.  . 

3 

6 

1 

9 

16 

12 

.  . 

1 

27 

28 

13 

13 

5 

.  . 

3 

3 

.  . 

3 

6 

1 

9 

16 

12 

.  . 

2 

28 

29 

14 

13 

5 

.  . 

3 

3 

.  . 

3 

6 

1 

10 

16 

11 

2 

29 

30 

14 

.  . 

4 

.  . 

3 

3 

.  . 

3 

6 

0 

10 

16 

11 

.  . 

3 

30 

31 

14 

•  • 

4 

•  • 

•  • 

3 

•  • 

•  • 

6 

0 

•  • 

16 

•  • 

3 

31 

10 


VI. 

TABLE  FOR  COMPUTING  TEKRESTKIAL  SURFACED. 

THE  tables  under  No.  VI.  were  published  by  Delcros  in  the  Annuaire  Meteoro- 
logique  de  la  France  pour  1850,  p.  65  et  seq. 

The  formula  from  which  they  have  been  computed  reads  as  follows  :  — 

sin  £  $  cos  (L  -|- 

-  4  [2 


[ 


sn 


etc.  ; 

in  which  a  =  ^-  great  axis  of  the  globe  ;  5  =  ^-  small  axis  ;  L  =  the  latitude  of  the 
lower  limit  of  a  quadrilateral  surface  ;  L'  =  the  latitude  of  the  upper  limit  of  the 
same  ;  <f>  —  L'  —  L  ;  S  =  the  area  of  a  quadrilateral  surface  of  one  degree  in  lon- 
gitude ;  TT  =  the  ratio  of  the  circumference  to  the  diameter. 

Substituting  the  numerical  values,  the  quarter  of  the  meridian  being  =  10,000,724 
legal  metres  ;  the  £  great  axis,  or  «,  =  6,376,989  metres  ;  the  £  small  axis,  or  Z>,  = 
6,356,323  metres  ;  the  ratio  of  the  axis  OT&.F*  ;  and  making  $  =  1°  nonagesimal,  the 
formula  becomes, 

224.996360  cos  (    L  +  0°  30') 

—  0.730851  cos  (3  L  +  1°  30') 
S=   J  -f  0.001784  cos  (5  L  +  2°  30') 

—  0.000004  cos  (7  L  +  3°  30') 
etc. 


The  first  three  terms  of  the  formula  give  the  results  with  sufficient  accuracy. 

In  order  to  avoid  too  large  a  number  of  figures,  the  results  are  given  in  square 
miles,  the  linear  base  of  which  is  a  mile  equal  to  T^  of  the  mean  degree  of  the 

meridian.     That  mile  is  thus  =  (  90  x  15~)  —  7407.942  metres.     In  order  to  con- 

vert the  results  into  new  geographical  miles,  of  which  60  =  1°,  multiply  by  16, 
log  =  1.2041200  ;  into  common  French  leagues,  25  =  1°,  multiply  by  2.777778, 
log  =  0.4436975  ;  into  nautical  leagues,  20  =  1°,  multiply  by  1.777778,  log  = 
0.2498775  ;  into  English  statute  miles,  69.163  =  1°,  by  21.711034,  log  =  1.3366868. 

USE  OF  THE  TABLES. 

Table  L,  which  gives  the  number  of  square  miles  contained  in  the  quadrilateral 
surfaces  of  one  degree  in  latitude  and  longitude,  successively  from  the  equator  to  the 
pole,  will  be  more  frequently  used.  Table  II.  has  been  computed  for  maps  on  a 
smaller  scale  ;  and  Tables  III.  and  IV.  for  maps  of  very  small  scale,  covering  large 
areas,  in  which  surfaces  of  one  degree  could  not  be  estimated  with  sufficient  accuracy. 
If  the  scale  is  large  enough  to  have  the  minutes  traced  on,  then  Table  V.  is  to  be  used. 

For  computing  a  surface  by  Table  I.,  which  may  serve  as  an  example  for  all  the 
others,  find  first  the  lowest  parallel  circle  which  crosses,  on  the  map,  the  surface  to 
be  estimated;  suppose  it  is  40°  lat.  N.,  and  the  zone  within  40°  and  41°  lat.  N. 
contains  four  integral  degrees  of  longitude,  that  is,  four  surfaces  of  one  degree  each 
way  ;  then  in  the  first  column  of  the  table,  on  the  line  beginning  with  latitude  40°, 
and  in  the  vertical  column  headed  4,  take  the  value  of  these  four  surfaces,  viz. 
685.88.  Then  take  likewise  the  value  of  the  number  of  surfaces  between  41°  and 
42°  lat.  N.,  and  so  on.  The  fractional  parts  left  outside  of  the  integral  degrees  are  best 
estimated,  with  the  compass,  in  decimals,  the  values  of  which  can  be  found  in  the 
columns  of  the  multiples,  by  properly  moving  the  decimal  point  to  the  left.  Having 
taken  them  in  that  way,  and  summing  them  up  with  all  the  integral  surfaces,  we  ob- 
tain the  total  surface  required. 

F  11 


VI.     TABLES    FOR    COMPUTING    SURFACES 


TABLE  I. 


QUADRILATERAL  SURFACES  or  1  DEGREE  IN  LATITUDE  AND  IN  LONGITUDE 
ON  THE  TERRESTRIAL  ELLIPSOID. 


Limiting 
LATITUDES. 

Multiples  of  these  Quadrilateral  Surfaces  from  1  to  9. 

Inf. 

Sup. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 

1 

224.259 

448.52 

672.78 

897.04 

1121.29 

1345.55 

1569.81 

1794.07 

2018.33 

1 

2 

224.192 

448.38 

672.58 

896.77 

1120.96 

1345.15 

1569.35 

1793.54 

2017.73 

2 

3 

224.059 

448.12 

672.18 

896.24 

1120.30 

1344.36 

1568.42 

1792.47 

2016.53 

3 

4 

223.860 

447.72 

671.58 

895.44 

1119.30 

1343.16 

1567.02 

1790.88 

2014.74 

4 

5 

223.594 

447.19 

670.78 

894.37 

1117.97 

1341.56 

1565.16 

1788.75 

2012.34 

5 

6 

223.261 

446.52 

669.78 

893.05 

1116.31 

1339.57 

1562.83 

1786.09 

2009.35 

6 

7 

222.863 

445.73 

668.59 

891.45 

1114.31 

1337.18 

1560.04 

1782.90 

2005.76 

7 

8 

222.398 

444.80 

667.19 

889.59 

1111.99 

1334.39 

1556.78 

1779.18 

2001.58 

8 

9 

221.867 

443.73 

665.60 

887.47 

1109.33 

1331.20 

1553.07 

1774.93 

1996.80 

9 

10 

221.270 

442.54 

663.81 

885.08 

1106.35 

1327.62 

1548.89 

1770.16 

1991.43 

10 

11 

220.607 

441.21 

661.82 

882.43 

1103.03 

1323.64 

1544.25 

1764.85 

1985.46 

11 

12 

219.878 

439.76 

659.63 

879.51 

1099.39 

1319.27 

1539.15 

1759.02 

1978.90 

12 

13 

219.084 

433.17 

657.25 

876.34 

1095.42 

1314.50 

1533.59 

1752.67 

1971.76 

13 

14 

218.225 

436.45 

654.67 

872.90 

1091.12 

1309.35 

1527.57 

1745.80 

1964.02 

14 

15 

217.300 

434.60 

651.90 

869.20 

1086.50 

1303.80 

1521.10 

1738.40 

1955.70 

15 

16 

216.311 

432.62 

648.93 

865.24 

1081.55 

1297.86 

1514.17 

1730.48 

1946.80 

16 

17 

215.257 

430.51 

645.77 

861.03 

1076.28 

1291.54 

1506.80 

1722.05 

1937.31 

17 

18 

214.138 

428.28 

642.41 

856.55 

1070.69 

1284.83 

1498.97 

1713.10 

1927.24 

18 

19 

212.955 

425.91 

638.87 

851.82 

1064.78 

1277.73 

1490.69 

1703.64 

1916.60 

19 

20 

211.709 

423.42 

636.13 

846.84 

1058.54 

1270.25 

1481.96 

1693.67 

1905.38 

20 

21 

210.399 

420.80 

631.20 

841.59 

1051.99 

1262.39 

1472.79 

1683.19 

1893.59 

21 

22 

209.025 

418.05 

627.08 

836.10 

1045.13 

1254.15 

1463.18 

1672.20 

1881.23 

22 

23 

207.589 

415.18 

622.77 

830.36 

1037.95 

1245.54 

1453.12 

1660.71 

1868.30 

23 

24 

206.090 

412.18 

618.27 

824.36 

1030.45 

1236.54 

1442.63 

1648.72 

1854.81 

24 

25 

204.529 

409.06 

613.59 

818.12 

1022.65 

1227.18 

1431.71 

1636.24 

1840.76 

25 

26 

202.907 

405.81 

608.72 

811.63 

1014.53 

1217.44 

1420.35 

1623.25 

1826.16 

26 

27 

201.223 

402.45 

603.67 

804.89 

1006.11 

1207.34 

1408.56 

1609.78 

1811.00 

27 

28 

199.477 

398.95 

598.43 

797.91 

997.39 

1196.86 

1396.34 

1595.82 

1795.30 

28 

29 

197.672 

395.34 

593.02 

790.69 

988.36 

1186.03 

1383.70 

1581.38 

1779.05 

29 

30 

195.806 

391.61 

587.42 

783.23 

979.03 

1174.84 

1370.64 

1566.45 

1762.26 

30 

31 

193.881 

387.76 

581.64 

775.52 

969.40 

1163.29 

1357.17 

1551.05 

1744.93 

31 

32 

191.897 

383.79 

575.69 

767.59 

959.48 

1151.38 

1343.28 

1535.17 

1727.07 

32 

33 

189.854 

379.71 

569.56 

759.41 

949.27 

1139.12 

1328.98 

1518.83 

1708.68 

33 

34 

187.753 

375.51 

563.26 

750.01 

938.76 

1126.52 

1314.27 

1502.02 

1689.77 

34 

35 

185.594 

371.19 

556.78 

742.38 

927.97 

1113.57 

1299.16 

1484.75 

1670.35 

35 

36 

183.379 

366.76 

550.14 

733.52 

916.89 

1100.27 

1283.65 

1467.03 

1650.41 

36 

37 

181.107 

362.21 

543.32 

724.43 

905.53 

1086.64 

1267.75 

1448.86 

1629.96 

37 

38 

178.780 

357.56 

536.34 

715.12 

893.90 

1072.68 

1251.46 

1430.24 

1609.02 

38 

39 

176.397 

352.79 

529.19 

705.59 

881.98 

1058.38 

1234.78 

1411.18 

1587.57 

39 

40 

173.960 

347.92 

521.88 

695.84 

869.80 

1043.76 

1217.72 

1391.68 

1565.64 

40 

41 

171.469 

342.94 

514.41 

685.88 

857.34 

1028.81 

1200.28 

1371.75 

1543.22 

41 

42 

168.925 

337.85 

506.77 

675.70 

844.62 

1013.55 

1182.47 

1351.40 

1520.22 

42 

43 

166.328 

332.66 

498.98 

665.31 

831.64 

997.97 

1164.30 

1330.62 

1496.95 

43 

44 

163.680 

327.36 

491.04 

654.72 

818.40 

982.08 

1145.76 

1309.44 

1473.12 

44 

45 

160.980 

321.96 

482.94 

643.92 

804.90 

965.88 

1126.86 

1287.84 

1448.82 

12 


ON    THE    TERRESTRIAL    ELLIPSOID. 


TABLE  I.    (Continued.)     QUADRILATERAL  SURFACES  OF  1  DEGREE  IN  LATITUDE  AND  IN 
LONGITUDE  ON  THE  TERRESTRIAL  ELLIPSOID. 


Limiting 
LATITUDES. 

Multiples  of  these  Quadrilateral  Surfaces  from  1  to  9. 

Inf. 

Sup. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

45 

46 

158.231 

316.46 

474.69 

632.92 

791.15 

949.39 

1107.62 

1265.85 

1424.08 

46 

47 

155.432 

310.86 

466.30 

621.73 

777.16 

932.59 

1088.02 

1243.46 

1398.89 

'47 

48 

152.584 

305.17 

457.75 

610.34 

762.92 

915.51 

1068.09 

1220.67 

1373.26 

48 

49 

149.689 

299.38 

449.07 

598.75 

748.44 

899.13 

1047.82 

1197.51 

1347.20 

49 

50 

146.746 

293.49 

440.24 

586.98 

733.73 

880.48 

1027.22 

1173.97 

1320.71 

50 

51 

143.757 

287.51 

431.27 

575.03 

718.78 

862.54 

1006.30 

1150.06 

1293.81 

51 

52 

140.723 

281.45 

422.17 

562.89 

703.61 

844.34 

985.06 

1125.78 

1266.51 

52 

53 

137.644 

275.29 

412.93 

550.58 

688.22 

825.86 

963.51 

1101.15 

1238.80 

53 

54 

134.522 

269.04 

403.57 

538.09 

672.61 

807.13 

941.65 

1076.17 

1210.70 

54 

55 

131.357 

262.71 

394.07 

525.43 

656.78 

788.14 

919.50 

1050.86 

1182.21 

55 

56 

128.150 

256.30 

384.45 

512.60 

640.75 

768.90 

897.05 

1025.20 

1153.35 

56 

57 

124.903 

249.81 

374.71 

499.61 

624.51 

749.42 

874.32 

999.22 

1124.13 

57 

58 

121.616 

243.23 

364.85 

486.46 

608.08 

729.69 

851.31 

972.92 

1094.54 

58 

59 

118.289 

236.58 

354.87 

473.16 

591.45 

709.74 

828.03 

946.32 

1064.61 

59 

60 

114.926 

229.85 

344.78 

459.70 

574.63 

689.55 

804.48 

919.41 

1034.33 

60 

61 

111.525 

223.05 

334.58 

446.10 

557.63 

669.15 

780.68 

892.20 

1003.73 

61 

62 

108.089 

216.18 

324.27 

432.35 

540.44 

648.53 

756.62 

864.71 

972.80 

62 

63 

104.618 

209.24 

313.85 

418.47 

523.09 

627.71 

732.32 

836.94 

941.56 

63 

64 

101.113 

202.23 

303.34 

404.45 

505.56 

606.68 

707.79 

808.90 

910.02 

64 

65 

97.575 

195.15 

292.73 

390.30 

487.88 

585.45 

683.03 

780.60 

878.18 

65 

66 

94.007 

188.01 

282.02 

376.03 

470.03 

564.04 

658.05 

752.05 

846.06 

66 

67 

90.408 

180.82 

271.22 

361.63 

452.04 

542.45 

632.85 

723.26 

813.67 

67 

68 

86.779 

173.56 

260.34 

347.12 

433.90 

520.68 

607.46 

694.23 

781.01 

68 

69 

83.123 

166.25 

249.37 

332.49 

415.61 

498.74 

581.86 

664.98 

748.11 

69 

70 

79.439 

158.88 

238.32 

317.76 

397.20 

476.64 

556.08 

635.52 

714.95 

70 

71 

75.730 

151.46 

227.19 

302.92 

378.65 

454.38 

530.11 

605.84 

681.57 

71 

72 

71.996 

143.99 

215.99 

287.99 

359.98 

431.98 

503.98 

575.97 

647.97 

72 

73 

68.239 

136.48 

204.72 

272.96 

341.20 

409.44 

477.68 

545.91 

614.15 

73 

74 

64.460 

•128.92 

193.38 

257.84 

322.30 

386.76 

451.22 

515.68 

580.14 

74 

75 

60.659 

121.32 

181.98 

242.64 

303.30 

363.96 

424.62 

485.28 

545.94 

75 

76 

56.839 

113.68 

170.52 

227.36 

284.20 

341.04 

397.88 

454.72 

511.55 

76 

77 

53.001 

106.00 

159.00 

212.00 

265.00 

318.00 

371.00 

424.00 

477.01 

77 

78 

49.145 

98.29 

147.43 

196.^8 

245.72 

294.87 

344.01 

393.16 

442.30 

78 

79 

45.272 

90.54 

135.82 

181.09 

226.36 

271.63 

316.91 

362.18 

407.45 

79 

80 

41.386 

82.77 

124.16 

165.54 

206.93 

248.31 

289.70 

331.08 

372.47 

80 

81 

37.485 

74.97 

112.46 

149.94 

187.43 

224.91 

262.40 

299.88 

337.37 

81 

82 

33.572 

67.14 

100.72 

134.29 

167.86 

201.43 

235.01 

268.58 

302.15 

82 

83 

29.649 

59.30 

88.95 

118.59 

148.24 

177.89 

207.54 

237.19 

266.84 

83 

84 

25.715 

51.43 

77.15 

102.86 

128.58 

154.29 

180.01 

205.72 

231.44 

84 

85 

21.773 

43.55 

65.32 

87.09 

108.87 

130.64 

152.41 

174.19 

195.96 

.85 

86 

17.824 

35.65 

53.47 

71.30 

89.12 

106.95 

124.77 

142.59 

160.42 

86 

87 

13.869 

27.74 

41.61 

55.48 

69.35 

83.22 

97.09 

110.96 

124.82 

87 

88 

9.910 

19.82 

29.73 

39.64 

49.55 

59.46 

69.37 

79.28 

89.19 

88 

89 

5.947 

11.89 

17.84 

23.79 

29.74 

35.68 

41.63 

47.58 

53.53 

89 

90 

1.983 

3.97 

5.95 

7.93 

9.91 

11.90 

13.88 

15.86 

17.84 

13 


TABLES    FOR    COMPUTING    SURFACES 


TABLE   II.      QUADRILATERAL   SURFACES   OP  2  DEGREES  IN  LATITUDE   AND   IN  LONGITUDE  ON 

THE  TERRESTRIAL  ELLIPSOID. 


Limiting 
LATITUDES. 

Multiples  of  these  Quadrilateral  Surfaces  from  1  to  9. 

Inf. 

Sup. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

§. 

9. 

0 

2 

896.903 

1793.81 

2690.71 

3587.61 

4484.51 

5381.42 

6278.32 

7175.22 

8072.13 

2 

4 

895.838 

1791.68 

2687.51 

3583.35 

4479.19 

5375.03 

6270.87 

7166.71 

8062.54 

4 

6 

893.710 

1787.42 

2681.13 

3574.84 

4468.55 

5362.26 

6255.97 

7149.68 

8043.3.9 

6 

8 

890.520 

1781.04 

2671.56 

3562.08 

4452.60 

5343.12 

6233.64 

7124.16 

S014.68 

8 

10 

886.272 

1772.54 

2658.82 

3545.09 

4431.36 

5317.63 

6203.91 

7090.18 

7976.45 

10 

12 

880.969 

1761.94 

2642.91 

3523.88 

4404.85 

5285.82 

6166.79 

7047.76 

7928.72 

12 

14 

874.617 

1749.23 

2623.85 

3498.47 

4373.09 

5247.70 

6122.32 

6996.94 

7871.55 

14 

16 

867.221 

1734.44 

2601.66 

3468.88 

4336.11 

5203.33 

6070.55 

6937.77 

7804.99 

16 

18 

858.789 

1717.58 

2576.37 

3435.16 

4293.95 

5152.74 

6011.52 

6870.31 

7729.10 

18 

20 

849.328 

1698.66 

2547.98 

3397.31 

4246.64 

5095.97 

5945.30 

6794.63 

7643.95 

20 

22 

838.848 

1677.70 

2516.54 

3355.39 

4194.24 

5033.09 

5871.94 

6710.78 

7549.63 

22 

24 

827.359 

1654.72 

2482.08 

3309.44 

4136.80 

4964.16 

5791.51 

6618.87 

7446.23 

24 

26 

814.872 

1629.74 

2444.62 

3259.49 

4074.36 

4889.23 

5704.11 

6518.98 

7333.85 

26 

28 

811.400 

1602.80 

2404.20 

3205.60 

4007.00 

4808.40 

5609.80 

6411.20 

7212.60 

28 

30 

786.956 

1573.91 

2360.87 

3147.83 

3934.78 

4721.74 

5508.69 

6295.65 

7082.61 

30 

32 

771.555 

1543.11 

2314.67 

3086.22 

3857.78 

4629.33 

5400.89 

6172.44 

6944.00 

32 

34 

755.213 

1510.43 

2265.64 

3020.85 

3776.06 

4531.28 

5286.49 

6041.70 

6796.92 

34 

36 

737.946 

1475.89 

2213.84 

2951.78 

3689.73 

4427.68 

5165.62 

5903.57 

6641.51 

36 

38 

719.773 

1439.55 

2159.32 

2879.09 

3598.87 

4318.64 

5038.41 

5758.19 

6477.96 

38 

40 

700.713 

1401.43 

2102.14 

2802.85 

3503.57 

4204.28 

4904.99 

5605.71 

6306.42 

40 

42 

680.787 

1361.57 

2042.36 

2723.15 

3403.93 

4084.72 

4765.51 

5446.29 

6127.08 

42 

44 

660.016 

1320.03 

1980.05 

2640.06 

3300.08 

3960.09 

4620.11 

5280.13 

5940.14 

44 

46 

638.423 

1276.85 

1915.27 

2553.69 

3192.11 

3830.54 

4468.96 

5107.38 

5745.81 

46 

48 

616.032 

1232.06 

1848.10 

2464.13 

3080.16 

3696.19 

4312.23 

4928.26 

5544.29 

48 

50 

592.869 

1185.74 

1778.61 

2371.48 

2964.34 

3557.21 

4150.08 

4742.95 

5335.82 

50 

52 

568.960 

1137.92 

1706.88 

2275.84 

2844.80 

3413.76 

3982.72 

4551.68 

5120.64 

52 

54 

544.332 

1088.66 

1632.99 

2177.33 

2721.66 

3265.99 

3810.32 

4354.65 

4898.99 

54 

56 

519.014 

1038.03 

1557.04 

2076.06 

2595.07 

3114.09 

3633.10 

4152.11 

4671.13 

56 

58 

493.037 

986.07 

1479.11 

1972.15 

2465.18 

2958.22 

3451  »26 

3944.29 

4437.33 

58 

60 

466.430 

932.86 

1399.29 

1865.72 

2332.15 

2798.58 

3265.01 

3731.44 

4197.87 

60 

62 

439.228 

878.46 

1317.68 

1756.91 

2196.14 

2635.37 

3074.59 

3513.82 

3953.05 

62 

64 

411.461 

822.92 

1234.38 

1645.84 

2057.30 

2468.76 

2880.23 

3291.69 

3703.15 

64 

66 

383.164 

766.33 

1149.49 

1532.66' 

1915.82 

2298.99 

2682.15 

3065.32 

3448.48 

66 

68 

354.374 

708.75 

1063.12 

1417.50 

1771.87 

2126.24 

2480.62 

2834.99 

3189.36 

68 

70 

325.124 

650.25 

975.37 

1300.50 

1625.62 

1950.75 

2275.87 

2601.00 

2926.12 

70 

72 

295.453 

590.91 

886.36 

1181.81 

1477.27 

1772.72 

2068.17 

2363.63 

2659.08 

72 

74 

265.398 

530.80 

796.20 

1061.59 

1326.99 

1592.39 

1857.79 

2123.19 

2388.59 

74 

76 

234.998 

469.99 

704.99 

939.99 

1174.99 

1409.99 

1644.98 

1879.98 

2114.98 

76 

78 

204.290 

408.58 

612.87 

817.16 

1021.45 

1225.74 

1430.03 

1634.32 

1838.61 

78 

80 

173.316 

346.63 

519.95 

693.26 

866.58 

1039.90 

1213.21 

1386.53 

1559.85 

80 

82 

142.115 

284.23 

426.34 

568.46 

710.57 

852.69 

994.80 

1136.92 

1279.0* 

82 

84 

110.728 

221.46 

332.18 

442.91 

553.64 

664.37 

775.09 

885.82 

996.55 

84 

86 

79.195 

168.39 

237.59 

316.78 

395.98 

475.17 

554.37 

633.56 

712.76 

86 

88 

47.559 

95.12 

142.68 

190.24 

237.79 

285.35 

332.91 

380.47 

428.03 

88 

90 

15.860 

31.72 

47.58 

63.44 

79.30 

95.16 

111.02 

126.88 

142.74 

14 


ON    THE    TERRESTRIAL    ELLIPSOID. 


TABLE  III.     QUADRILATERAL  SURFACES  OF  5  DEGREES  IN  LATITUDE  AND  IN  LONGITUDE  ON 

THE  TERRESTRIAL  ELLIPSOID. 


Limiting 
LATITUDES. 

Multiples  of  these  Quadrilateral  Surfaces  from  1  to  9. 

Inf. 

Sup. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

S. 

9. 

0 
5 
10 
15 
20 

5 
10 
15 
20 
25 

5599.821 
5558.288 
5475.466 
5351.846 
5188.165 

11199.64 
11116.58 
10950.93 
10703.69 
10376.33 

16799.46  22399.29 
16674.87  22233.15 
16426.40  21901.87 
16055.54  21407.39 
15564.49  20752.66 

27999.11 
27791.44 
27377.33 
26759.23 
25940.82 

33598.93 
33349.73 
32852.80 
32111.08 
31128.99 

39198.75 
38908.02 
38328.27 
37462.93 
36317.15 

44798.57 
44466.31 
43803.73 
42814.77 
41505.32 

50398-39 
50024.60 
49279.20 
48166.62 
46693.48 

25 
30 
35 
40 
45 

30 
35 

40 
45 
50 

4985.425 
4744.891 
4468.110 
4156.909 
3813.408 

9970.85 
9485.78 
8936.22 
8313.82 
7626.82 

14956.27 
14234.67 
13404.33 
12470.73 
11440.22 

19941.70 
18979.57 
17872.44 
16627.64 
15253.63 

24927.12 
23724.46 
22340.55 
20784.54 
19067.04 

29912.55 
28469.35 
26808.66 
24941.45 
22880.45 

34897.97 
33214.24 

31276.77 
29098.36 
26693.86 

39883.40 
37959.13 
35744.88 
33255.27 
30507.26 

44868.82 
42704.02 
40212.99 
37412.18 
34320.67 

50 
55 
60 
65 
70 

55 
60 
65 

70 
75 

3440.013 
3039.419 
2614.598 
2168.779 
1705.427 

6880.03 
6078.84 
5229.20 
4337.56 
3410.85 

10320.04 
9118.26 
7843.80 
6506.34 
5116.28 

13760.05 
12157.68 
10458.39 
8675.12 
6821.71 

17200.06 
15197.09 
13072.99 
10843-89 
8527.13 

20640.08 
18236.51 
15687.59 
13012.67 
10232.56 

24080.09 
21275.93 
18302.19 
15181.45 
11937.99 

27520.10 
24315.35 
20916.79 
17350.23 
13643.42 

30960.12 
27354.77 
23531.39 
19519.01 
15348.84 

75 

80 
85 

80 
85 
90 

1228.213 

740.973 
247.668 

2456.43 
1481.95 
495.34 

3684.64 
2222.92 
743.00 

4912.85 
2963.89 
990.67 

6141.07 
3704.86 
1238.34 

7369.28 
4445.84 
1486.01 

8597.49 
5186.81 
1733.68 

9825.71 
5927.78 
1981.34 

11053.92 
6668.76 
2229.01 

TABLE  IV.  QUADRILATERAL  SURFACES  OF  10  DEGREES  IN  LATITUDE  AND  IN  LONGITUDE  ON 
THE  TERRESTRIAL  ELLIPSOID. 

Limiting 
LATITUDES. 

Multiples  of  these  Quadrilateral  Surfaces  from  1  to  9. 

Inf. 

Sup. 

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

9. 

0 
10 

20 

10 
20 
30 

22316.220 
21654.626 
20347.180 

44632.44 
43309.25 
40694.36 

66948.66 
04963.88 
61041.54 

89264.88 
86618.50 

81388.72 

111581.10133897.32 
108273.13  129927.76 
101735.90  122083.08 

156213.54 
151582.38 
142430.26 

178529.76 
173237.01 
162777.44 

200845.98 
194891.63 
183124.62 

30 
40 
50 

40 

50 
60  ! 

18426.004 
15940.634 
12958.864 

36852.01 
31881.27 
25917.73 

55278.01 
47821.90 
38876.59 

73704.02 
63762.54 
51835.46 

92130.02110556.02 
79703.17  95643.80 
64794.32  77753.18 

128982.03 
111584.44 
90712.05 

147408.03 
127525.07 
103670.91 

165834.04 
143465.71 
116629.78 

60 
70 
85 

70 
80 
90  | 

9566.755 
5867.281 
1977.282 

19133.51 
11734.56 
3954.56 

28700.26 
17601.84 
5931.85 

38267.02 
23469.12 
7909.13 

47833.77 
29336.40 
9886.41 

57400.53 
35203.69 
11863.69 

66967.28 
41070.97 
13840.97 

76534.04 
46938.25 
15818.26 

86100.79 
52805.53 
17795.54 

15 


TABLES    FOR   COMPUTING    SURFACES. 


TABLE  V.    MEAN  QUADRILATERAL  SURFACES  OF  1, 10,  20,  AND  30  MINUTES  IN  LATITUDE 
AND  IN  LONGITUDE  DEDUCED  FROM  EACH  QUADRILATERAL  OF  1  DEGREE  IN  TABLE  I. 


Limiting 
LATITUDES. 

Mean  Surfaces  measuring  in  Latitude 
and  in  Longitude. 

Limiting 
LATITUDES. 

Mean  Surfaces  measuring  in  Latitude 
and  in  Longitude. 

Inf. 

Sup. 

1'. 

10'. 

20'. 

30'. 

Inf. 

Sup. 

1. 

10'. 

20'. 

SO'. 

0 

1 

0.0623 

6.229 

24.918 

56.065 

45 

46 

0.0440 

4.395 

17.581 

39.558 

1 

2 

0.0623 

6,228 

24.910 

56.048 

46 

47 

0.0432 

4.318 

17.270 

38.858 

2 

3 

0.0622 

6.224 

24.895 

56.015 

47 

48 

0.0424 

4.238 

16.954 

38.146 

3 

4 

0.0622 

6.218 

24.873 

55.965 

48 

49 

0.0416 

4.158 

16.632 

37.422 

4 

5 

0.0621 

6.211 

24.844 

55.898 

49 

50 

0.0408 

4.076 

16.305 

36.686 

5 

6 

0.0620 

6.202 

24.807 

55.815 

50 

51 

0.0399 

3.993 

15.973 

35.939 

6 

7 

0.0619 

6.191 

24.763 

55.716 

51 

52 

0.0391 

3.909 

15.636 

35.181 

7 

8 

0.0618 

6.178 

24.711 

55.599 

52 

53 

0.0382 

3.823 

15.294 

34.411 

8 

9 

0.0616 

6.163 

24.652 

55.467 

53 

54 

0.0374 

3.737 

14.947 

33.630 

9 

10 

0.0615 

6.146 

24.586 

55.317 

54 

55 

0.0365 

3.649 

14.595 

32.839 

10 

11 

0.0613 

6.128 

24.512 

55.152 

55 

56 

0.0356 

3.560 

14.239 

32.038 

11 

12 

0.0611 

6.108 

24.431 

54.970 

56 

57 

0.0347 

3.470 

13.878 

31.226 

12 

13 

Q.0609 

6.086 

24.343 

54.771 

57 

58 

0.0338 

3.378 

13.513 

30.404 

13 

14 

0.0606 

6.062 

24.247 

54.556 

58 

59 

0.0329 

3.286 

13.143 

29.572 

14 

15 

0.0604 

6.036 

24.144 

54.325 

59 

60 

0.0319 

3.192 

12.770 

28.731 

15 

16 

0.0601 

6.009 

24.035 

54.078 

60 

61 

0.0310 

3.098 

12.392 

27.881 

16 

17 

0.0598 

5.979 

23.917 

53.814 

61 

62 

0.0300 

3.002 

12.010 

27.022 

17 

18 

0.0595 

5.948 

23.793 

53.534 

62 

63 

0.0291 

2.906 

11.624 

26.154 

18 

19 

0.0592 

5.915 

23.662 

53.239 

63 

64 

0.0281 

2.809 

11.235 

25.278 

19 

20 

0.0588 

5.881 

23.523 

52.927 

64 

65 

0.0271 

2.710 

10.842 

24.394 

20 

21 

0.0584 

5.844 

23.378 

52.600 

65 

66 

0.0261 

2.611 

10.445 

23.502 

21 

22 

0.0581 

5.806 

23.225 

52.256 

66 

67 

0.0251 

2.511 

10.045 

22.602 

22 

23 

0.0577 

5.766 

23.065 

51.897 

67 

68 

0.0241 

2.411 

9.642 

21.695 

23 

24 

0,0572 

5.725 

22.899 

51.523 

68 

69 

0.0231 

2.309 

9.236 

20.781 

24 

25 

0.0568 

5.681 

22.725 

51.132 

69 

70 

0.0221 

2.207 

8.827 

19.860 

25 

26 

0.0564 

5.636 

22.545 

50.727 

70 

71 

0.0210 

2.104 

8.414 

18.933 

26 

27 

0.0559 

5.590 

22.358 

50.306 

71 

72 

0.0200 

2.000 

8.000 

17.999 

27 

28 

0.0554 

5.541 

22.164 

49.869 

72 

73 

0.0190 

.896 

7.582 

17.060 

28 

29 

0.0549 

5.491 

21.964 

49.418 

73 

74 

0.0179 

.791 

7.162 

16.115 

29 

30 

0.0544 

5.439 

21.756 

48.952 

74 

75 

0.0168 

.685 

6.740 

15.165 

30 

31 

0.0539 

5.386 

21.542 

48.470 

75 

76 

0.0158 

.579 

6.315 

14.210 

31 

32 

0.0533 

5.330 

21.322 

47.974 

76 

77 

0.0147 

.472 

5.889 

13.250 

32 

33 

0.0527 

5.274 

21.095 

47.463 

77 

78 

0.0137 

.365 

5.461 

12.286 

33 

34 

0.0522 

5.215 

20.861 

46.938 

78 

79 

0.0126 

1.258 

5.030 

11.318 

34 

35 

0.0516 

5.155 

20.622 

46.399 

79 

80 

0.0115 

1.150 

4.598 

10.346 

35 

36 

0.0509 

5.094 

20.375 

45.845 

80 

81 

0.0104 

1.041 

4.165 

9.371 

36 

37 

0.0503 

5.031 

20.123 

45.277 

81 

82 

0.0093 

0.933 

3.730 

8.393 

37 

38 

0.0497 

4.966 

19.864 

44.695 

82 

83 

0.0082 

0.824 

3.294 

7.412 

38 

39 

0.0490 

4.900 

19.600 

44.099 

83 

84 

0.0071 

0.714 

2.857 

6.429 

39 

40 

0.0483 

4.832 

19.329 

43.490 

84 

85 

0.0060 

0.605 

2.419 

5.443 

40 

41 

0.0476 

4.763 

19.052 

42.867 

85 

86 

0.0049 

0.495 

1.980 

4.456 

41 

42 

0.0469 

4.692 

18.769 

42.231 

86 

87 

0.0039 

0.385 

1.541 

3.467 

42 

43 

0.0462 

4.620 

18.481 

41.582 

87 

88 

0.0028 

0.275 

1.101 

2.477 

43 

44 

0.0455 

4.547 

18.187 

40.920 

88 

89 

0.0017 

0.165 

0.661 

1.487 

44 

45 

0.0447 

4.472 

17.887 

40.245 

89 

90 

0.0006 

0.055 

0.220 

0.496 

16 


THIS  BOOK  IS  DUE  ON  THE  LAST  DATE 
STAMPED  BELOW 

AN  INITIAL  FINE  OP  25  CENTS 

WILL.  BE  ASSESSED  FOR  FAILURE  TO  RETURN 
THIS  BOOK  ON  THE  DATE  DUE.  THE  PENALTY 
WILL  INCREASE  TO  SO  CENTS  ON  THE  FOURTH 
DAY  AND  TO  $1.OO  ON  THE  SEVENTH  DAY 
OVERDUE. 


'55, 


QCT  3  1  19 

MAR  I1 

Wrtio  ' 


UCD  LIBRA! 


FEB  1  8 


f  f 


JHfALi 


Book  Slip-25m-7,'53(A8998s4)458 


PHYSICAL 
SCIENCES 
LIBRARY 


Q-CS73 

GS 
1858 


PSL 


UNIY  .IFORNIA 

DAVIS 


97952 


